WO2020259662A1 - 一种随机接入的方法及通信装置 - Google Patents

一种随机接入的方法及通信装置 Download PDF

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Publication number
WO2020259662A1
WO2020259662A1 PCT/CN2020/098394 CN2020098394W WO2020259662A1 WO 2020259662 A1 WO2020259662 A1 WO 2020259662A1 CN 2020098394 W CN2020098394 W CN 2020098394W WO 2020259662 A1 WO2020259662 A1 WO 2020259662A1
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Prior art keywords
format
response message
message
terminal device
mac
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/CN2020/098394
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English (en)
French (fr)
Inventor
酉春华
黄曲芳
徐小英
郭英昊
娄崇
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to EP20830662.1A priority Critical patent/EP3982686A4/en
Publication of WO2020259662A1 publication Critical patent/WO2020259662A1/zh
Priority to US17/563,815 priority patent/US12232177B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0836—Random access procedures, e.g. with 4-step access with 2-step access

Definitions

  • This application relates to the field of communications, and more specifically, to a method and communication device for random access.
  • a terminal device In a wireless communication system, a terminal device needs to establish a connection with the network, and this process is usually called a random access (random access, RA) process.
  • RA random access
  • the terminal device can establish uplink synchronization with the network and obtain a unique cell-Radio network temporary identifier (C-RNTI).
  • C-RNTI cell-Radio network temporary identifier
  • the purpose of random access is to establish synchronization. Only when the uplink synchronization is achieved, the terminal equipment can perform uplink transmission.
  • random access has a special purpose: if no dedicated scheduling request (SR) resource is configured on the physical uplink control channel (PUCCH) or when the SR fails, random access can be used to Apply for scheduling resources.
  • SR dedicated scheduling request
  • the random access process includes two methods: competition and non-competition.
  • the contention-based random access process usually consists of the following steps: the terminal device randomly selects a random access preamble (RAP) from the random access preamble sequence set, and sets the random access resource pre-designated by the network device (For example, the physical random access channel (PRACH)) sends the selected RAP; the terminal device receives the random access response from the network device on the physical downlink shared channel (PDSCH) (random access response, RAR) message; according to the C-RNTI contained in the RAR message, the terminal device sends a message including a message for contention resolution to the base station on the physical uplink shared channel (PUSCH) specified in the RAR message ; And the terminal equipment needs to receive the contention resolution message sent from the base station to complete the random access process.
  • RAP random access preamble
  • PRACH physical random access channel
  • PDSCH physical downlink shared channel
  • RAR random access response
  • the two-step random access mechanism usually includes the following steps: the terminal device sends an RAP and data (payload) to the base station; the base station sends a response message to the terminal device according to the decoding situation of the RAP and/or data.
  • the format of the response message in the two-step random access mechanism has not been clarified, resulting in an incomplete two-step random access mechanism and the reliability of network communication cannot be guaranteed.
  • the present application provides a random access method and communication device, which can make response messages more flexible and efficient, and can meet different usage requirements.
  • a random access method is provided, which may be executed by a terminal device, or may also be executed by a chip or circuit configured in the terminal device, which is not limited in this application.
  • the method includes: the terminal device receives the response message sent by the network device; the terminal device determines the message format of the response message, the message format includes the first format or the second format; the terminal device responds to the response message according to the determined message format of the response message The response message is parsed; where the response message in the first format includes a contention resolution identifier and a control plane message, and the response message in the second format includes a contention resolution identifier and does not include the control plane message.
  • the first format may also be called Format 1B
  • the second format may also be called Format 1A
  • the first format may also be called Format 1A
  • the second format may also be called Format 1B.
  • the specific name of the format or the second format is not limited.
  • the response message described in this application refers to a response message for requesting random access, and may also be called a random access response (message).
  • the response message in the first format of this application includes a contention resolution identification and a control plane message.
  • the response message in the second format includes the contention resolution identifier but does not include the control plane message (the control plane message can be sent in subsequent messages).
  • the network device can determine which message format to choose to send the response message according to the specific situation. For example, in order to enable the terminal device to receive the control plane message as soon as possible, the first format may be used to send a response message to the terminal device. For another example, in order to be able to multiplex the response messages of as many terminal devices as possible (the number of bits occupied by one terminal device should not be too much at this time), thereby improving the utilization of wireless resources, the network device can use the second format to The terminal device sends a response message. After receiving the response message, the terminal device may first determine the message format, and then parse the response message according to the corresponding format.
  • the random access method provided by the embodiment of the application also provides two message formats for response messages, and the network device can choose to use any message format to send the response message to the terminal device according to the specific situation, making the response message more flexible , Efficient, and able to meet different needs.
  • response message in the first format or the response message in the second format may also include other content, which is not limited in this application.
  • the response message in the first format or the response message in the second format further includes at least one of the following information: a timing advance command, a temporary cell radio network temporary identifier C-RNTI, and uplink authorization.
  • the control plane message can also be regarded as a response message based on scheduled transmission.
  • the control plane message includes any one of the following messages: a radio resource control RRC connection establishment message in an initial access scenario, and an inactive state transition The RRC recovery message of the scene and the RRC re-establishment message of the RRC connection re-establishment scene.
  • the response message in the second format not only includes the contention resolution identifier, but also includes at least one of the following information corresponding to each of the N terminal devices: timing advance command, temporary cell wireless network temporary identifier C-RNTI, uplink authorization, etc. are not limited in this application.
  • the response message in the second format may not include the contention resolution identifier, but include at least one of the following information corresponding to each of the N terminal devices: timing advance command, temporary cell radio network temporary identifier C-RNTI, uplink authorization, etc. This application is not limited.
  • the response message in the first format or the response message in the second format is carried in a media access control MAC protocol data unit PDU.
  • the MAC PDU includes a first MAC subPDU and a second MAC subPDU, and the contention resolution identifier of the response message in the first format is carried in the first MAC subPDU , The control plane message of the response message in the first format is carried in the second MAC subPDU.
  • contention resolution identifier and the control plane message in the first MAC subPDU and the second MAC subPDU belong to the same terminal device.
  • the contention resolution identifier and the control plane message of the response message in the first format may also be carried in the same MAC subPDU.
  • the contention resolution identifier and the control plane message of the response message in the first format may also be carried in 3 or more MAC sub-PDUs, which is not limited in this application.
  • the response message in the first format may also include other content such as a timing advance command, a temporary C-RNTI, an uplink authorization, etc.
  • the above other content may be carried in the same MAC subPDU as the contention resolution identifier.
  • the response message in the second format includes N contention resolution identifiers corresponding to N terminal devices.
  • the N contention resolution identifiers are carried in the MAC PDU, and N is greater than Or an integer equal to 2. Therefore, the response messages of multiple terminal devices can be shared together, and the utilization of wireless resources can be improved.
  • the MAC PDU includes S MAC sub-PDUs, S is greater than or equal to N, and the N contention resolution identifiers are carried in the N MAC sub-PDUs, respectively.
  • S is greater than or equal to N
  • the N contention resolution identifiers are carried in the N MAC sub-PDUs, respectively.
  • the MAC PDU does not include the control plane message corresponding to any one of the N terminal devices, so that response messages from more terminal devices can multiplex the MAC PDU, or in other words, make the The size of MAC PDU will not be too large.
  • the N contention resolution identifiers can also be carried in more or less than N MAC subPDUs.
  • multiple contention resolution identifiers can be multiplexed into one MAC subPDU, or one contention resolution identifier can be carried in one or Among multiple MAC sub-PDUs, this application is not limited to this.
  • each terminal device its response message may also include other content such as timing advance commands, temporary C-RNTI, uplink authorization, etc. Therefore, the above-mentioned other content corresponding to each terminal device can be carried with its own contention resolution identification. In the same MAC sub-PDU.
  • the method further includes: the terminal device receives instruction information sent by the network device, and the instruction information is used to indicate the message format of the response message.
  • the indication information may be carried in the MAC PDU, or the indication information may be carried in the DCI corresponding to the response message.
  • the indication information may be carried in a MAC sub-PDU in the MAC PDU, or in a MAC subheader (MAC subheader).
  • MAC subheader MAC subheader
  • the indication information may be carried in a reserved bit field in the MAC subheader.
  • a bit of the reserved bit field may be 0 or 1 to indicate whether the message format of the response message is the first format or the second format. Two formats.
  • the indication information may also be carried in the type indication field in the MAC subPDU.
  • the type indication field indicates whether the MAC subPDU is a fixed length or a variable length to indirectly indicate whether the message format of the response message is the first format or The second format.
  • the indication information may also be carried in the MAC sub-PDU.
  • the MAC sub-PDU may be a dedicated MAC sub-PDU, specifically used to carry the indication information.
  • the terminal device receiving the response message sent by the network device includes: the terminal device uses the first wireless network temporary identifier RNTI and the second RNTI to receive the response message; the terminal device determines the response
  • the message format of the message includes: the terminal device determines the message format of the response message according to the reception of the response message.
  • the terminal device simultaneously uses the first RNTI and the second RNTI to receive the response message, and determines the message format of the response message according to the status of receiving the response message.
  • the terminal device may determine that the response message is a response message in the first format, that is, the message format is the first format.
  • the terminal device may determine that the response message is a response message in the second format, that is, the message format is the second format.
  • the terminal device receiving the response message sent by the network device includes: the terminal device monitors the DCI corresponding to the response message on the combination of the first resource set and the second resource; the terminal The device determining the message format of the response message includes: the terminal device determines the message format of the response message according to the monitoring status of the DCI corresponding to the response message.
  • the terminal device simultaneously monitors the DCI corresponding to the response message in the first resource set and the second resource set, and determines the message format of the response message according to the monitoring situation of the DCI corresponding to the response message.
  • the terminal device may determine that the response message is a response message in the first format, that is, the message format is the first format.
  • the terminal device may determine that the response message is a response message in the second format, that is, the message format is the second format.
  • the first resource set includes a control channel resource set and/or search space
  • the second resource set includes a control channel resource set and/or search space
  • a random access method is provided.
  • the method may be executed by a network device, or may also be executed by a chip or a circuit configured in the network device, which is not limited in this application.
  • the method includes: a network device determines a message format of a response message, the message format includes a first format or a second format, and the network device uses the determined message format to send a response message to the terminal device; wherein the response message in the first format, Including the contention resolution identifier and the control plane message, the response message in the second format includes the contention resolution identifier and does not include the control plane message.
  • the response message in the first format of this application includes a contention resolution identification and a control plane message.
  • the response message in the second format includes the contention resolution identifier but does not include the control plane message (the control plane message can be sent in subsequent messages).
  • the network device can determine which message format to choose to send the response message according to the specific situation. For example, in order to enable the terminal device to receive the control plane message as soon as possible, the first format may be used to send a response message to the terminal device. For another example, in order to be able to multiplex the response messages of as many terminal devices as possible (the number of bits occupied by one terminal device should not be too much at this time), thereby improving the utilization of wireless resources, the network device can use the second format to The terminal device sends a response message.
  • the random access method provided by the embodiment of the application also provides two message formats for response messages, and the network device can choose to use any message format to send the response message to the terminal device according to the specific situation, making the response message more flexible , Efficient, and able to meet different needs.
  • response message in the first format or the response message in the second format may also include other content, which is not limited in this application.
  • the response message in the first format or the response message in the second format further includes at least one of the following information: a timing advance command, a temporary cell radio network temporary identifier C-RNTI, and uplink authorization.
  • the control plane message can also be regarded as a response message based on scheduled transmission.
  • the control plane message includes any one of the following information: a radio resource control RRC connection establishment message in an initial access scenario, and an inactive state transition The RRC recovery message of the scene and the RRC re-establishment message of the RRC connection re-establishment scene.
  • the response message in the second format not only includes the contention resolution identifier, but also includes at least one of the following information corresponding to each of the N terminal devices: timing advance command, temporary cell wireless network temporary identifier C-RNTI, uplink authorization, etc. are not limited in this application.
  • the response message in the second format may not include the contention resolution identifier, but include at least one of the following information corresponding to each of the N terminal devices: timing advance command, temporary cell radio network temporary identifier C-RNTI, uplink authorization, etc. This application is not limited.
  • the response message in the first format or the response message in the second format is carried in the media access control MAC protocol data unit PDU.
  • the MAC PDU includes a first MAC subPDU and a second MAC subPDU, and the contention resolution identifier of the response message in the first format is carried in the first MAC subPDU , The control plane message of the response message in the first format is carried in the second MAC subPDU.
  • the contention resolution identifier and the control plane message of the response message in the first format may also be carried in the same MAC subPDU.
  • the contention resolution identifier and the control plane message of the response message in the first format may also be carried in 3 or more MAC sub-PDUs, which is not limited in this application.
  • the response message in the first format may also include other content such as a timing advance command, a temporary C-RNTI, an uplink authorization, etc.
  • the above other content may be carried in the same MAC subPDU as the contention resolution identifier.
  • the response message in the second format includes N contention resolution identifiers corresponding to N terminal devices, and the N contention resolution identifiers are carried in the MAC PDU, where N is An integer greater than or equal to 2. Therefore, the response messages of multiple terminal devices can be shared together, and the utilization of wireless resources can be improved.
  • the MAC PDU includes S MAC sub-PDUs, S is greater than or equal to N, and the N contention resolution identifiers are carried in the N MAC sub-PDUs, respectively.
  • S is greater than or equal to N
  • the N contention resolution identifiers are carried in the N MAC sub-PDUs, respectively.
  • the MAC PDU does not include the control plane message corresponding to any one of the N terminal devices, so that response messages from more terminal devices can multiplex the MAC PDU, or in other words, make the The size of MAC PDU will not be too large.
  • the N contention resolution identifiers can also be carried in more or less than N MAC subPDUs.
  • multiple contention resolution identifiers can be multiplexed into one MAC subPDU, or one contention resolution identifier can be carried in one or Among more MAC subPDUs, this application is not limited to this.
  • each terminal device its response message may also include other content such as timing advance commands, temporary C-RNTI, uplink authorization, etc. Therefore, the above-mentioned other content corresponding to each terminal device can be carried with its own contention resolution identification. In the same MAC sub-PDU.
  • the method further includes: the network device sends instruction information to the terminal device, the instruction information is used to indicate the message format of the response message.
  • the indication information may be carried in the MAC PDU, or the indication information may be carried in the DCI corresponding to the response message.
  • the indication information can be carried in a MAC sub-PDU or MAC sub-header in the MAC PDU.
  • the indication information may be carried in a reserved bit field in the MAC subheader.
  • a bit of the reserved bit field may be 0 or 1 to indicate whether the message format of the response message is the first format or the second format. Two formats.
  • the indication information may also be carried in the type indication field in the MAC subPDU.
  • the type indication field indicates whether the MAC subPDU is a fixed length or a variable length to indirectly indicate whether the message format of the response message is the first format or The second format.
  • the indication information may also be carried in the MAC sub-PDU.
  • the MAC sub-PDU may be a dedicated MAC sub-PDU, specifically used to carry the indication information.
  • the network device uses the determined message format of the response message to send the response message to the terminal device, including: when the message format of the response message determined by the network device is the first format The network device uses the first wireless network temporary identifier RNTI to send the response message in the first format; when the message format of the response message determined by the network device is the second format, the network device uses the second RNTI to send the response message in the second format .
  • the network device uses the determined message format of the response message to send the response message to the terminal device, including: when the message format of the response message determined by the network device is the first format , The network device sends the downlink control information DCI corresponding to the response message in the first format on the first resource set; when the message format of the response message determined by the network device is the second format, the network device sends the second resource on the second resource set The DCI corresponding to the response message in the second format.
  • the first resource set includes a control channel resource set and/or search space
  • the second resource set includes a control channel resource set and/or search space
  • a communication device in a third aspect, includes: a receiving unit for receiving a response message sent by a network device; a determining unit for determining a message format of the response message, the message format including the first format or the first format The second format, where the response message in the first format includes a contention resolution identifier and a control plane message, and the response message in the second format includes a contention resolution identifier and does not include the control plane message; the parsing unit is used to determine the response message Parse the response message in the message format.
  • the response message in the first format or the response message in the second format is carried in the media access control MAC protocol data unit PDU.
  • the MAC PDU includes a first MAC subPDU and a second MAC subPDU, and the contention resolution identifier of the response message in the first format is carried in the first MAC subPDU , The control plane message of the response message in the first format is carried in the second MAC subPDU.
  • the response message in the second format includes N contention resolution identifiers corresponding to N terminal devices.
  • the N contention resolution identifiers are carried in the MAC PDU, and N is greater than Or an integer equal to 2.
  • the MAC PDU includes S MAC sub-PDUs, S is greater than or equal to N, and the N contention resolution identifiers are respectively carried in the N MAC sub-PDUs.
  • the method further includes: the terminal device receives the instruction information sent by the network device, and the instruction information is used to indicate the message format of the response message.
  • the receiving unit uses the first wireless network temporary identifier RNTI and the second RNTI to receive the response message; the determining unit determines the message format of the response message according to the status of receiving the response message.
  • the receiving unit monitors the DCI corresponding to the response message on the combination of the first resource set and the second resource; the determining unit monitors the DCI corresponding to the response message Determine the message format of the response message.
  • the first resource set includes a control channel resource set and/or search space
  • the second resource set includes a control channel resource set and/or search space
  • the indication information is carried in the MAC PDU, or the indication information is carried in the DCI corresponding to the response message.
  • the response message in the first format or the response message in the second format further includes at least one of the following information: timing advance command, temporary cell wireless network temporary Identifies C-RNTI and uplink authorization.
  • control plane message includes any one of the following information: radio resource control RRC connection establishment, RRC recovery, and RRC reestablishment.
  • a communication device in a fourth aspect, includes a determining unit configured to determine a message format of a response message, the message format including a first format or a second format, wherein the response message in the first format includes The contention resolution identifier and the control plane message, the response message in the second format includes the contention resolution identifier and does not include the control plane message; the sending unit is configured to send the response message to the terminal device using the determined message format of the response message.
  • the response message in the first format or the response message in the second format is carried in a media access control MAC protocol data unit PDU.
  • the MAC PDU includes a first MAC sub-PDU and a second MAC sub-PDU, and the contention resolution identifier of the response message in the first format is carried in the first MAC sub-PDU , The control plane message of the response message in the first format is carried in the second MAC subPDU.
  • the response message in the second format includes N contention resolution identifiers corresponding to the N terminal devices, and the N contention resolution identifiers are carried in the MAC PDU, N is an integer greater than or equal to 2.
  • the MAC PDU includes S MAC sub-PDUs, S is greater than or equal to N, and the N contention resolution identifiers are respectively carried in the N MAC sub-PDUs.
  • the sending unit is further configured to send indication information to the terminal device, and the indication information is used to indicate a message format of the response message.
  • the sending unit when the message format of the response message determined by the determining unit is the first format, uses the first wireless network temporary identifier RNTI to send the response message in the first format; When the message format of the response message determined by the determining unit is the second format, the sending unit uses the second RNTI to send the response message in the second format.
  • the sending unit when the message format of the response message determined by the determining unit is the first format, the sending unit sends the response message in the first format on the first resource set.
  • Corresponding downlink control information DCI when the message format of the response message determined by the determining unit is the second format, the sending unit sends the DCI corresponding to the response message in the second format on the second resource set.
  • the first resource set includes a control channel resource set and/or search space
  • the second resource set includes a control channel resource set and/or search space
  • the indication information is carried in the MAC PDU, or the indication information is carried in the DCI corresponding to the response message.
  • the response message in the first format or the response message in the second format further includes at least one of the following information: timing advance command, temporary cell wireless network temporary Identifies C-RNTI and uplink authorization.
  • control plane message includes any one of the following messages: radio resource control RRC connection establishment, RRC recovery, and RRC reestablishment.
  • a communication device which may be a terminal device or a chip in the terminal device.
  • the device may include a processing unit and a transceiving unit.
  • the processing unit may be a processor, and the transceiving unit may be a transceiver;
  • the terminal device may also include a storage unit, and the storage unit may be a memory;
  • the processing unit executes the instructions stored by the storage unit, so that the terminal device executes the method in the first aspect.
  • the processing unit may be a processor, and the transceiving unit may be an input/output interface, a pin or a circuit, etc.; the processing unit executes the instructions stored in the storage unit to make
  • the terminal device executes the method in the first aspect
  • the storage unit may be a storage unit in the chip (for example, a register, a cache, etc.), or a storage unit in the terminal device located outside the chip (for example, Read only memory, random access memory, etc.).
  • a communication device may be a network device or a chip in the network device.
  • the device may include a processing unit and a transceiving unit.
  • the processing unit may be a processor, and the transceiving unit may be a transceiver;
  • the network device may also include a storage unit, and the storage unit may be a memory;
  • the processing unit executes the instructions stored by the storage unit, so that the network device executes the method in the second aspect.
  • the processing unit may be a processor, the transceiving unit may be an input/output interface, a pin or a circuit, etc.; the processing unit executes the instructions stored in the storage unit,
  • the storage unit may be a storage unit (for example, a register, a cache, etc.) in the chip, or may be a storage unit in the network device located outside the chip.
  • the storage unit (for example, read only memory, random access memory, etc.).
  • a communication device including at least one processor configured to couple with a memory, read and execute instructions in the memory, to implement any one of the first aspect or the second aspect kind of method.
  • a computer program product comprising: computer program code, when the computer program code runs on a computer, the computer executes the method in the first aspect or the second aspect.
  • the above computer program code may be stored in whole or in part on a first storage medium, where the first storage medium may be packaged with the processor or separately packaged with the processor, and this application does not specifically limit this .
  • a computer-readable medium stores program code, and when the computer program code runs on a computer, the computer executes the method in the first or second aspect above .
  • Fig. 1 shows a schematic diagram of a communication system suitable for embodiments of the present application.
  • Figure 2 shows a flow chart of competing random access between the LTE system and the 5G NR system.
  • Figure 3 shows a flow chart of two-step random access in a 5G NR system.
  • Figure 4 shows a schematic diagram of the structure of the layer 2 protocol stack.
  • Fig. 5 shows a schematic structural diagram of an example of MAC PDU.
  • Fig. 6 shows a schematic structural diagram of an example of a MAC subheader.
  • Fig. 7 shows a schematic flowchart of an example of a random access method.
  • FIG. 8 shows a schematic diagram of an example in which the response message in the first format is carried in the MAC PDU.
  • FIG. 9 shows a schematic structural diagram of a contention resolution identifier carried in the first MAC subPDU.
  • FIG. 10 shows a schematic structural diagram of a control plane message carried in a second MAC subPDU.
  • FIG. 11 shows a schematic diagram of another example of the first MAC subPDU.
  • FIG. 12 shows a schematic diagram of another example of the first MAC subPDU.
  • FIG. 13 shows a schematic diagram of another example of the first MAC subPDU.
  • FIG. 14 shows a schematic diagram of another example of the first MAC subPDU.
  • FIG. 15 shows a schematic diagram of another example of the first MAC subPDU.
  • FIG. 16 shows a schematic diagram of an example in which the response message in the second format is carried in the MAC PDU.
  • FIG. 17 is a schematic flowchart of another example of the random access method of the present application.
  • Fig. 18 is a schematic diagram of a communication device according to an embodiment of the present application.
  • FIG. 19 is a schematic structural diagram of a network device according to an embodiment of the present application.
  • FIG. 20 is a schematic diagram of a communication device according to another embodiment of the present application.
  • FIG. 21 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
  • GSM global system for mobile communications
  • CDMA code division multiple access
  • WCDMA broadband code division multiple access
  • GPRS general packet radio service
  • LTE long term evolution
  • LTE frequency division duplex FDD
  • TDD LTE Time division duplex
  • UMTS universal mobile telecommunication system
  • WiMAX worldwide interoperability for microwave access
  • Fig. 1 shows a schematic diagram of a suitable communication system suitable for embodiments of the present application.
  • the communication system 10 may include at least one network device, such as the network device 11 shown in FIG. 1; the communication system 10 may also include at least one terminal device, such as the terminal device 12 shown in FIG. 1.
  • the network device 11 and the terminal device 12 can communicate via a wireless link.
  • Each communication device, such as the network device 11 or the terminal device 12 may be configured with multiple antennas, and the multiple antennas may include at least one transmitting antenna for transmitting signals and at least one receiving antenna for receiving signals.
  • each communication device additionally includes a transmitter chain and a receiver chain.
  • Those of ordinary skill in the art can understand that they can all include multiple components related to signal transmission and reception (such as processors, modulators, multiplexers). , Demodulator, demultiplexer or antenna, etc.). Therefore, the network device 11 and the terminal device 12 can communicate through multi-antenna technology.
  • the network device in the wireless communication system may be any device with a wireless transceiver function.
  • the equipment includes but is not limited to: evolved NodeB (eNB or eNodeB), radio network controller (RNC), node B (NodeB, NB), base station controller (BSC) ), base transceiver station (BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (BBU), wireless fidelity (WIFI) system
  • the access point (AP), wireless relay node, wireless backhaul node, transmission point (TP), or transmission and reception point (TRP), etc. can also be 5G, such as , NR, gNB in the system, or transmission point (TRP or TP), one or a group of antenna panels (including multiple antenna panels) of the base station in the 5G system, or it can also be a network that constitutes a gNB or transmission point Nodes, such as baseband unit (BBU), or distributed unit (DU), etc.
  • RNC
  • the gNB may include a centralized unit (CU) and a DU.
  • the gNB may also include a radio unit (RU).
  • CU implements some functions of gNB
  • DU implements some functions of gNB, for example, CU implements radio resource control (radio resource control, RRC), packet data convergence protocol (packet data convergence protocol, PDCP) layer functions
  • DU implements wireless link
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • DU implements wireless link
  • RLC radio link control
  • MAC media access control
  • PHY physical
  • the network device may be a CU node, or a DU node, or a device including a CU node and a DU node.
  • the CU can be divided into network equipment in an access network (radio access network, RAN), and the CU can also be divided into network equipment in a core network (core network, CN), which is not limited in this application.
  • the terminal equipment in the wireless communication system may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile equipment, User terminal, terminal, wireless communication device, user agent or user device.
  • the terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, and an augmented reality (AR) terminal Equipment, wireless terminals in industrial control, wireless terminals in unmanned driving (self-driving), wireless terminals in remote medical, wireless terminals in smart grid, transportation safety ( Wireless terminals in transportation safety, wireless terminals in smart cities, and wireless terminals in smart homes.
  • the embodiment of this application does not limit the application scenario.
  • random access procedures are usually required in the following situations: the terminal device is initially connected and transitions from the idle state to the connected state; the RRC connection is re-established after the wireless connection is interrupted; the terminal device needs to be switched Establish uplink synchronization with the target cell; when the terminal device is in a connected state but the terminal device is not in uplink synchronization, at this time uplink or downlink data arrives, uplink synchronization needs to be established through random access; when using uplink measurement-based user positioning; When no dedicated scheduling request resource is allocated on the PUCCH, an uplink resource is applied for through random access.
  • random access may introduce new scenarios. For example, when the downlink data (DL data) arrives in the inactive state, the uplink is in an unsynchronized state; when the uplink data (UL data) arrives in the inactive state, the uplink is in an unsynchronized state; the inactive state transitions; the terminal The device requests an On-demand system message (System Information, SI); the terminal device sends a beam failure recovery request (Beam Failure Recovery Request); the terminal device requests a system message (request for other SI), etc.
  • SI System Information
  • Beam Failure Recovery Request Beam Failure Recovery Request
  • system message request for other SI
  • the inactive state is a newly introduced state in 5G, which is between the connected state and the idle state.
  • the inactive state there is no RRC connection between the terminal device and the access network device, but the connection between the access network device and the core network device is maintained, and the terminal device stores all or part of the information necessary to establish/restore the connection. Therefore, in the inactive state, when a terminal device needs to establish a connection, it can quickly establish/restore an RRC connection with the access network device according to the stored relevant information.
  • Figure 2 shows a flow chart of competing random access between the LTE system and the 5G NR system.
  • the random access process is triggered by the PDCCH order or the MAC sublayer or the RRC sublayer itself. If the terminal device receives a PDCCH transmission scrambled with C-RNTI and consistent with the PDCCH order, it will trigger a random access procedure.
  • the PDCCH order or RRC message can indicate the preamble index RA-Preamble Index (64 types in total) used in the resource selection of the random access process, and the physical layer random access channel index RA-PRACH-Mask Index (16 types in total) ).
  • the preamble index is used to indicate the preamble of random access.
  • the current preamble index value is 000000, it means that the random access is initiated by the MAC sublayer, that is, the preamble is selected by the MAC sublayer itself, and executes accordingly.
  • Competitive random access When the value of the current preamble index is not 000000, the UE uses the preamble indicated by the preamble index for random access, that is, performs non-contention random access.
  • the physical layer physical access channel index RA-PRACH-Mask Index is used to indicate that the terminal device can send the preamble on the PRACH corresponding to the subframe in the system frame. The terminal device can look up the corresponding table through RA-PRACH-Mask Index to determine Preamble and available physical resources.
  • Random access initialization requires configuration parameters. These parameters include: PRACH resource set (such as PRACH-Config Index) that can be used to transmit random access preamble; available random access preamble group (group A or group B) and each group The set of available preambles; the maximum number of preamble transmissions (preamble Trans-Max); the initial transmit power of the preamble (preamble Initial Received Target power); the power ramping step size (power Ramping Step); the random access response window (RA- Response window Size; the maximum number of HARQ retransmissions (max HARQ-Msg3) of the third message (Msg3); contention resolution timer (mac-Contention Resolution Timer).
  • PRACH resource set such as PRACH-Config Index
  • the above-mentioned configured parameters can be updated through high-level configuration.
  • the terminal device performs the following operations after obtaining the above parameters: clear the Msg3 buffer; set the number of preamble transmissions (PREAMBLE_TRANSMISSION_COUNTER) to 1; set the backoff parameter value saved by the terminal device to 0ms, and enter the random access resource selection stage.
  • the terminal device only performs one random access procedure at any one time. If during a random access process, the terminal device receives a newly initiated random access request, the implementation on the terminal device side decides to continue the ongoing random access process or start a new random access process.
  • the terminal device sends a random access preamble (Preamble) to the network device.
  • Preamble a random access preamble
  • the RAP is carried in the first message (Msg1).
  • the main function of RAP is to tell the network device that there is a random access request, and enable the network device to estimate the transmission delay between it and the terminal device, so that the access network device can calibrate the uplink timing and calibrate it.
  • the information is notified to the terminal device through a timing advance command (Timing Advance command).
  • random access can also be used for other requests from terminal devices in the new scenario.
  • RAP may also be used to indicate a request to send an on-demand system message, or to indicate a request to send a beam failure recovery request, etc., which is not limited in this application.
  • RAP may have a correspondence relationship with one or more on-demand SI requests, or RAP may have a correspondence relationship with one or more beam failure recovery requests.
  • the terminal device may pre-configure the RAP or receive the RAP configured by the access network device.
  • the terminal device receives a random access response (RAR) sent by the network device.
  • RAR random access response
  • the terminal device can monitor the PDCCH by using the random access radio network temporary identifier (RA-RNTI), and if it receives its own scheduling information, that is, downlink control information (DCI), The terminal device receives the RAR message sent from the network device on the PDSCH according to the DCI information.
  • the DCI information includes related content such as resource block (Resource Block, RB) allocation information, modulation and coding scheme (Modulation and Coding Scheme, MCS).
  • the random access response is carried in the second message (Msg2).
  • the terminal device After the terminal device sends the preamble, it will monitor the corresponding PDCCH according to the RA-RNTI value corresponding to the preamble in the RAR response window. If the Preamble carried in the response received by the terminal device is consistent with the Preamble sent by Msg1, it stops monitoring the RAR. Specifically, the network device can send the RAR to the terminal device through the PDSCH.
  • the RAR includes the uplink timing advance, the uplink grant (UL grant) allocated for the third message (Msg3), the temporary cell radio network temporary identifier (temporary C-RNTI) allocated by the network side, and so on.
  • the PDCCH carrying the Msg2 scheduling message is scrambled with RA-RNTI.
  • the corresponding multiple RARs are multiplexed in the same medium access control (MAC) protocol data unit (protocol data unit). data unit, PDU).
  • MAC medium access control
  • the terminal device sends a message based on scheduled transmission (ie, Msg3) to the network device.
  • the terminal device sends Msg3 to the network device via PUSCH according to the uplink grant and uplink timing advance information in Msg2.
  • the content of Msg3 may be different depending on the status of the terminal device and the different application scenarios.
  • the network device in 130 sends MAC PDUs to multiple terminal devices, the RAR received by each terminal device may be different, and accordingly, the behavior of each terminal device may also be different. After each terminal device monitors its own RAR, it can send Msg3 to the access network device according to the specific content contained in the RAR.
  • Msg3 can be divided into the following types: RRC connection request, tracking area data update, resource scheduling request, etc. Some examples of Msg3 are given in Table 1.
  • the terminal device receives the contention resolution sent by the network device, that is, the fourth message Msg4.
  • contention occurs. At most, only one terminal device among the terminal devices competing for the same resource can successfully access. At this time, the network device sends a contention resolution message to the terminal device through the PDSCH.
  • the terminal device After sending Msg3, the terminal device starts the contention resolution timer (mac-Contention Resolution Timer), and uses the Temporary C-RNTI indicated in the RAR or the C-RNTI pre-configured by the network device to monitor the PDCCH. If it is competing Before the resolution timer expires, if the terminal device receives a contention resolution message from the network device to itself, it considers that the random access process is successful.
  • the contention resolution timer (mac-Contention Resolution Timer)
  • the terminal device uses the Temporary C-RNTI indicated in the RAR or the C-RNTI pre-configured by the network device to monitor the PDCCH. If it is competing Before the resolution timer expires, if the terminal device receives a contention resolution message from the network device to itself, it considers that the random access process is successful.
  • the 5G NR system supports two-step random access in addition to the current traditional four-step random access method.
  • Two-step random access is currently a research hotspot of random access in 5G NR systems.
  • Figure 3 shows a flow chart of two-step random access in 5G NR systems.
  • the terminal device sends a message A (MsgA) to the network device.
  • MsgA message A
  • the MsgA includes a random access signal and payload data.
  • the random access signal may include a preamble and/or a demodulation reference signal (DMRS).
  • DMRS demodulation reference signal
  • the random access signal is used to receive the payload data.
  • the transmission boundary of the payload data (such as the start position and the end position of the slot for transmitting the payload data) or demodulation can be determined according to the random access signal.
  • the payload data may be control plane data and/or user plane data, and the payload data may correspond to the content contained in Msg3 in the foregoing four-step random access mechanism.
  • the payload data may include any one of RRC connection request, terminal device identification, scheduling request, buffer status report (buffer status report, BSR), and real service data.
  • the identity of the terminal device may be a C-RNTI, a temporary mobile subscriber identity (serving-temporary mobile subscriber identity, s-TMSI), an identity of the terminal in an inactive state (resumeIdentity), and so on.
  • the specific identification carried depends on different random access trigger events and is not limited. It should be noted that the identification of the terminal device may be carried in the payload data, or may be partly carried in the payload data, and partly carried in the random access signal. Wherein, carried in the random access signal can be understood as different sequences or the same sequence but different cyclic shifts to indicate different bit values. Table 2 shows the identification of the terminal equipment corresponding to different random access trigger events.
  • Random access trigger event Type of UE identity Initial access NAS terminal device ID (S-TMSI) or random number RRC connection re-establishment
  • C-RNTI Switch C-RNTI Uplink/downlink data arrives, uplink out of sync C-RNTI inactive state transition ShortI-RNTI or I-RNTI Request system information no Beam failure recovery
  • S-TMSI Initial access NAS terminal device ID
  • C-RNTI Switch C-RNTI Uplink/downlink data arrives, uplink out of sync C-RNTI inactive state transition ShortI-RNTI or I-RNTI Request system information no Beam failure recovery
  • the network device After receiving the MsgA, the network device decodes the random access signal and the payload data, and obtains the decoding conditions including: (1) “successful decoding”; (2) “unsuccessful decoding”. Table 3 shows the possible decoding results.
  • the possible relationship between the resource where the random access signal is located and the resource where the payload data is located is as follows: 1) There is an overlapping area in the time domain, and there is no overlapping area in the frequency domain; 2) There is no overlapping area in the time domain, There may or may not be overlapping areas in the frequency domain.
  • the resource where the random access signal is located and the resource where the load data is located may be configured by the network device.
  • the network device sends a message B (MsgB) to the terminal device.
  • MsgB message B
  • MsgB is used to carry the response message for the random access signal and payload data.
  • the response message may include at least one of the following: temporary C-RNTI information, timing advance command (TA command) information, uplink authorization information, contention resolution ID information, etc.
  • TA command timing advance command
  • uplink authorization information e.g., uplink authorization information
  • contention resolution ID information e.g., uplink authorization information
  • the contention resolution identifier may be part or all of the content of the payload data.
  • the response message also includes a control plane message (which can also be regarded as a response message based on scheduled transmission).
  • RAR may also include one of the following: RRC connection (RRCSetup) message , RRC reestablishment (RRCReestablishment) message, RRC resume (RRCResume) message, etc.
  • the response message described in this application refers to a response message for requesting random access, and may also be called a random access response (message).
  • MAC PDU Media Access Control Protocol Data Unit
  • the 3rd generation partnership project defines the layer 2 (L2) protocol stack in the LTE protocol from top to bottom, including the PDCP layer, RLC layer and MAC layer three logical layers, in the NR protocol
  • the defined layer 2 (L2) protocol stack includes four logical layers: Service Data Adaptation Protocol (SDAP) layer, PDCP layer, RLC layer and MAC layer from top to bottom.
  • SDAP Service Data Adaptation Protocol
  • the SDAP layer completes the mapping of the quality of service (QoS) flow to the radio bearer;
  • the PDCP layer completes the functions of data transmission, encryption, integrity protection and header compression of the user plane and the control plane;
  • the RLC layer completes the data packet Functions such as size matching;
  • MAC layer completes functions such as data scheduling and mapping between logical channels and transmission channels.
  • the entire L2 downlink protocol stack processing flow is: PDCP layer data plus PDCP header form the PDCP protocol data unit and send it to the RLC layer. After the RLC layer completes certain functions, it sends the received data plus the RLC header to the MAC layer.
  • the layer multiplexes one or more MAC service data units (service data unit, SDU) to form a MAC PDU and send it to the terminal device.
  • Figure 4 shows a schematic structural diagram of the layer 2 protocol stack of LTE.
  • Fig. 5 shows a schematic structural diagram of an example of MAC PDU.
  • one MAC PDU may include multiple MAC sub-PDUs (subPDU).
  • the MAC sub-PDU may include any one of MAC SDU, MAC control elements (medium access control control elements, MAC CE), and padding data.
  • Padding data is the padding data.
  • the MAC PDU may or may not include padding data. data.
  • the MAC sub-PDU may or may not include a MAC subheader.
  • Fig. 6 shows a schematic structural diagram of an example of a MAC subheader.
  • the MAC sub-header may correspond to the sub-headers of the MAC sub-PDU 2 and the MAC sub-PDU n in FIG. 5.
  • the MAC subheader includes a reserved bit field R, and also includes a format field F, a logical channel identification field LCID (logical channel ID field), and a length field L.
  • the logical channel identification field LCID usually occupies 6 Bit
  • the format field F occupies 1 bit
  • the format field F is used to indicate the length of the length field L, for example, when the value of the format field F is 0, the length of the length field L is 8 bits, and the value of the format field F When it is 1, it means that the length of the length field L is 16 bits.
  • the length field L is used to indicate the size of the MAC subPDU.
  • the embodiment of the application provides a random access method, and also provides two message formats for random access responses.
  • the network device can choose to use any message format to send random access responses to the terminal device according to the specific situation, so that random access Access response is more flexible and efficient, and can meet different usage requirements.
  • the network device in the embodiment may be the network device 11 in FIG. 1, and the terminal device may be the terminal device 12 in FIG.
  • FIG. 7 is a schematic flowchart of a two-step random access method 300 of the present application.
  • a random access method 300 provided by an embodiment of the present application is described with reference to FIG. 7.
  • the method 300 includes:
  • Step 310 The network device determines the message format of the response message, where the message format includes the first format or the second format, wherein the response message in the first format includes a contention resolution identifier and a control plane message;
  • the response message in the second format includes the contention resolution identifier and does not include the control plane message.
  • the first format may also be called Format 1B
  • the second format may also be called Format 1A
  • the first format may also be called Format 1A
  • the second format may also be called Format 1B.
  • the specific name of the format or the second format is not limited.
  • Step 320 The network device sends a response message to the terminal device using the determined message format.
  • step 320 the terminal device receives the response message sent by the network device.
  • the network device first receives the random access request message (that is, corresponding to the message A (MsgA) in the preceding two-step random access) sent by the terminal device.
  • the random access request message includes a random access signal and payload data.
  • the random access signal may be a preamble and/or DMRS.
  • the content of the payload data may be different.
  • the first data may include RRC connection request, terminal device identification, scheduling Any part of requests, cache status reports, and real business data.
  • the random access trigger scenario may be any one of initial access, RRC connection re-establishment, state transition in the inactive state, and system request message.
  • the payload data may include any one of the RRC connection establishment request message in the initial access scenario, the RRC re-establishment request message in the RRC connection re-establishment scenario, and the RRC recovery request message in the inactive state transition scenario.
  • the network device After receiving the random access request message, the network device needs to decode the random access signal and payload data contained in it.
  • the result of the network equipment decoding the random access signal and the payload data may be the case 2 and the case 4 in Table 3 above, that is, the network equipment should successfully decode the payload data, and the random access signal The decoding result of the access signal is not required.
  • the network device After the network device receives the random access request message and successfully decodes the payload data, it can generate corresponding response information according to the content in the payload data.
  • the response information may include a contention resolution identifier, and, Optionally, it may also include a control plane message, and the network device sends a response message to the terminal device in the first format or the second format.
  • the contention resolution identifier may be part or all of the content of the payload data.
  • the contention resolution identifier may be a character string connected based on a certain part of the scheduled transmission message, which is not limited in this application.
  • the terminal device After receiving and parsing the response message, the terminal device matches the contention resolution identifier with the corresponding content in the transmitted payload data. If the two match successfully (for example, the content of the two is the same), it can be determined that the response message is The response belongs to the terminal, you can stop listening for response messages at this time.
  • control plane message may include any of the following messages: RRC connection establishment in the initial access scenario, RRC re-establishment in the RRC connection re-establishment scenario, and state transition in the inactive state The RRC recovery of the scene.
  • the response message in the first format includes a contention resolution identification and a control plane message.
  • the response message in the second format includes the contention resolution identifier but does not include the control plane message (the control plane message can be sent in other messages).
  • the network device can determine which message format to choose to send the response message according to the specific situation. For example, in order to enable the terminal device to receive the control plane message as soon as possible, the first format may be used to send a response message to the terminal device. For another example, in order to be able to multiplex the response messages of as many terminal devices as possible (the number of bits occupied by one terminal device should not be too much at this time), thereby improving the utilization of wireless resources, the network device can use the second format to The terminal device sends a response message.
  • the random access method provided in the embodiments of the present application also provides two message formats for random access responses, and the network device can choose to use any message format to send random access responses to the terminal device according to the specific situation, so that Random access response is more flexible and efficient, and can meet different usage requirements.
  • the network device may also determine which message format is selected to send the response message according to an instruction of the terminal device.
  • the network device may determine to use the first format or the second format to send the response message according to an instruction of the terminal device.
  • the terminal device may indicate the message format of the response message in an explicit or implicit manner, and the network device may determine the message format used according to the indication.
  • the terminal device can indicate the message format of the response message in any of the following two ways.
  • the method 300 further includes:
  • the terminal device sends the message format request information of the response message to the network device, where the message format request information is used to indicate the message format used by the network device to send the response message.
  • the network device receives the message format request information sent by the terminal device, and determines the message format used to send the response message according to the message format request information.
  • the message format request information may be carried in uplink control information (UCI).
  • UCI uplink control information
  • the message format request information may be carried in a random access request message (ie, message A).
  • the system or protocol can be specified, or can be agreed between the network device and the terminal device, and the terminal device can send a random access request message according to the following rules:
  • the terminal device determines that the message format of the requested response message is the first format, the terminal device sends random access request information on the first random access resource;
  • the terminal device determines that the message format of the requested response message is the second format, the terminal device sends random access request information on the second random access resource.
  • the network device can determine the message format of the response message according to the receiving situation of the random access request information.
  • the network device may determine that the message format of the random access response is the first format.
  • the network device may determine that the message format of the random access response is the second format.
  • the first random access resource and the second random access resource may be specified by the system or protocol, or may be agreed between the network device and the terminal device.
  • the "protocol" in the embodiment of the present application may refer to a standard protocol in the communication field, for example, may include the LTE protocol, the NR protocol, and related protocols applied to future communication systems, which are not limited in this application.
  • random access configurations for example, response window length
  • the terminal device may receive response messages of different message formats according to different random access configurations.
  • the terminal device may receive the response message in the first format according to the first random access configuration.
  • the terminal device may receive the response message in the first format within the length of the first response window.
  • the terminal device may receive the response message in the second format according to the second random access configuration.
  • the terminal device may receive the response message in the second format within the length of the second response window.
  • the terminal device may select a corresponding random access configuration according to the instruction content to receive the response message.
  • the terminal device may receive the response message in the first format according to the first random access configuration corresponding to the first format.
  • the terminal device may receive the response message in the second format according to the second random access configuration corresponding to the second format.
  • the response message may also include at least one of a timing advance command, a temporary cell radio network temporary identifier C-RNTI, and an uplink authorization, that is, a response message in the first format or a response message in the second format It may also include at least one of a timing advance command, a temporary C-RNTI, and an uplink grant.
  • the uplink grant may be used to transmit feedback for response information (for example, HARQ feedback), and may be PUCCH resources or PUSCH resources.
  • the response message in the second format includes N contention resolution identifiers corresponding to the N terminal devices, and N is an integer greater than or equal to 2, so that the response messages of multiple terminal devices can be multiplexed together to improve radio resources. Utilization rate.
  • the response message in the second format may not include the contention resolution identifier, but at least one of the following information corresponding to each of the N terminal devices: timing advance command, temporary cell wireless network temporary Identifies C-RNTI and uplink authorization, which is not limited in this application.
  • the response message in the second format does not include the control plane message corresponding to any one of the N terminal devices.
  • the response message in the second format only includes the contention resolution identifiers of the N terminals, but does not include control plane messages.
  • the response messages of as many terminal devices as possible can be multiplexed together to improve the utilization rate of wireless resources.
  • the response message in the second format not only includes the contention resolution identifier, but also includes at least one of the following information corresponding to each of the N terminal devices: timing advance command, temporary cell radio network temporary identifier C-RNTI, uplink authorization, etc., This application is not limited to this.
  • the response message in the first format or the response message in the second format is carried in the media access control MAC protocol data unit PDU.
  • the contention resolution identifier and the control plane message can be carried in the MAC PDU at the same time, and for the response message in the second format, the contention resolution identifier can be carried in the MAC PDU.
  • FIG. 8 shows a schematic diagram of an example in which the response message in the first format is carried in the MAC PDU.
  • the MAC PDU includes at least a first MAC subPDU and a second MAC subPDU.
  • the contention resolution identifier of the response message in the first format is carried in the first MAC subPDU.
  • the control plane of the response message in the first format The message is carried in the second MAC subPDU.
  • FIG. 9 shows a schematic structural diagram of a contention resolution identifier carried in a first MAC subPDU
  • FIG. 10 shows a schematic structural diagram of a control plane message carried in a second MAC subPDU.
  • byte 1 (corresponding to oct 1 shown in the figure) is used to carry the MAC subheader of the first MAC subPDU, and byte 2-7 (oct 2-7) is used to carry the contention resolution identifier.
  • byte 1 (oct 1) and byte 2 (oct2) are used to carry the MAC subheader of the second MAC subPDU.
  • other MAC sub-PDUs may carry other communication data of the terminal device, which is not limited in this application.
  • the contention resolution identifier and the control plane message of the response message in the first format may also be carried in the same MAC subPDU.
  • the contention resolution identifier and the control plane message of the response message in the first format may also be carried in 3 or more MAC sub-PDUs, which is not limited in this application.
  • the response message in the first format may also include timing advance commands, temporary C-RNTIs, uplink authorizations and other content.
  • the other content mentioned above can be carried in the same MAC subPDU (that is, the first MAC subPDU).
  • Figures 11-16 show schematic structural diagrams in which the first MAC subPDU also carries the above-mentioned other content.
  • FIG. 11 shows a schematic diagram of another example of the first MAC subPDU.
  • the first MAC subPDU in addition to the contention resolution identifier, the first MAC subPDU also carries a timing advance command, an uplink grant, and a temporary C-RNTI.
  • FIG. 12 shows a schematic diagram of another example of the first MAC subPDU.
  • the first MAC subPDU in addition to the contention resolution identifier, the first MAC subPDU also carries a timing advance command and a temporary C-RNTI.
  • FIG. 13 shows a schematic diagram of another example of the first MAC subPDU.
  • the first MAC subPDU in addition to the contention resolution identifier, the first MAC subPDU also carries a timing advance command.
  • FIG. 14 shows a schematic diagram of another example of the first MAC subPDU.
  • the first MAC subPDU in addition to the contention resolution identifier, the first MAC subPDU also carries a temporary C-RNTI.
  • FIG. 15 shows a schematic diagram of another example of the first MAC subPDU.
  • the first MAC subPDU in addition to the contention resolution identifier, also carries an uplink grant.
  • FIG. 16 shows a schematic diagram of an example in which the response message in the second format is carried in the MAC PDU.
  • the MAC PDU includes S MAC sub-PDUs, S is greater than or equal to N, and N contention resolution identifiers are carried in N MAC sub-PDUs, for example, terminal devices 1, 2, 3, and N
  • the contention resolution identifier can be carried in the first, second, third, and N MAC sub-PDUs respectively. In this way, the response messages of multiple terminal devices can be multiplexed with the same MAC PDU, which can improve the utilization of wireless resources.
  • the first, second, third, and N MAC sub-PDUs carry the contention resolution identifiers of the terminal devices 1, 2, 3, and N for the structural schematic diagram after the contention resolution identifiers of the terminal devices 1, 2, 3, and N are carried.
  • the MAC PDU does not include the control plane message corresponding to any one of the N terminal devices, so that response messages from more terminal devices can be multiplexed into the MAC PDU, or in other words, The size of the MAC PDU will not be too large.
  • the N contention resolution identifiers may also be carried in more than or less than N MAC subPDUs.
  • multiple contention resolution identifiers may be multiplexed into one MAC subPDU, or one contention The resolution identifier is carried in one or more MAC subPDUs, which is not limited in this application.
  • each terminal device its response message may also include other content such as timing advance commands, temporary C-RNTI, uplink authorization, etc. Therefore, the above-mentioned other content corresponding to each terminal device can be carried with its own contention resolution identification.
  • the same MAC sub-PDU that is, the first MAC sub-PDU.
  • first, second, third, and N MAC sub-PDUs may also correspond to other contents carrying terminal devices 1, 2, 3, and N, respectively.
  • first, second, third, and N MAC sub-PDUs carrying other content please refer to Fig. 11-16, and the corresponding structure description can also refer to the relevant expressions above, which will not be repeated in this application.
  • Step 330 The terminal device determines the message format of the response message.
  • Step 340 The terminal device parses the response message according to the determined message format of the response message.
  • the terminal device may not know which message format the network device uses to send the response message (that is, the terminal device does not instruct the network device to use which message format to send the response message). Therefore, the terminal device is performing the response message Before parsing, you first need to determine the message format of the response message.
  • the network device may indicate the message format of the response message in an explicit or implicit manner, and the terminal device may determine the message format used according to the indication.
  • the network device can indicate the message format of the response message in any of the following three ways.
  • the method 300 further includes:
  • Step 321 The network device sends instruction information to the terminal device, where the instruction information is used to indicate the message format of the response message.
  • step 321 the terminal device receives the instruction information.
  • the terminal device determines the message format of the response message through the indication information.
  • the terminal device may be instructed in an explicit manner, and the terminal device determines the message format of the response message according to the instruction information.
  • the indication information is used to indicate whether there is a control plane message, or the indication information is used to indicate unicast MAC PDU (for example, a response message corresponding to the first format) or a multicast MAC PDU (for example, corresponding to the second format) Response message).
  • the indication information indicates that there is a control plane message, that is, the indication information indicates that the message format of the response message is the first format
  • the terminal device parses the response message according to the message format (ie, the first format) of the response message corresponding to the control plane message.
  • the indication information may be carried in the MAC PDU.
  • it can be carried in the MAC sub-PDU or MAC sub-header in the MAC PDU.
  • the indication information may be carried in a reserved bit field in the MAC subheader.
  • a bit of the reserved bit field may be 0 or 1 to indicate whether the message format of the response message is the first format or the second format. Two formats.
  • the indication information may also be carried in the type indication field in the MAC subPDU.
  • the type indication field indicates whether the MAC subPDU is a fixed length or a variable length to indirectly indicate whether the message format of the response message is the first format or The second format.
  • the indication information may also be carried in the MAC sub-PDU.
  • the MAC sub-PDU may be a dedicated MAC sub-PDU (for example, the third MAC sub-PDU in FIG. 8 or the S-th MAC sub-PDU in FIG. 16), which is specifically used to carry the indication information.
  • the indication information may also be carried in the DCI corresponding to the response message.
  • the DCI is used to allocate downlink resources, and the downlink resources are used to transmit response messages.
  • the system or protocol can be specified, or can also be agreed between the network device and the terminal device.
  • the response message can be sent according to the following rules:
  • the network device uses the first wireless network temporary identifier RNTI to send the response message in the first format;
  • the network device uses the second RNTI to send the response message in the second format.
  • the terminal device may receive the response message according to the following rules:
  • the terminal device uses the first wireless network temporary identifier RNTI and the second RNTI to receive the response message.
  • the terminal device determines the message format of the response message according to the status of receiving the response message.
  • the network device uses the first RNTI to send the response message in the first format.
  • the first RNTI is used to scramble the cyclic redundancy check (CRC) of the DCI corresponding to the response message in the first format.
  • CRC cyclic redundancy check
  • the DCI is used to allocate PDSCH resources, and the PDSCH resources are used to carry the response message in the first format.
  • the network device uses the second RNTI to send the response message in the second format.
  • the second RNTI is used to scramble the CRC of the DCI corresponding to the response message in the second format.
  • the DCI is used to allocate PDSCH resources and the PDSCH resources Used to carry the response message in the second format.
  • the terminal device uses the first RNTI and the second RNTI to receive the response message, specifically, it may use the first RNTI and the second RNTI to descramble the CRC of the DCI corresponding to the response message.
  • the network device After receiving the random access request message, the network device can generate an RNTI according to a preset rule according to the random access request message (for example, the time-frequency position of the preamble), and the RNTI is used to send a response message. Accordingly, The terminal device also generates the RNTI according to the same rule, and uses the RNTI to receive the random access response.
  • a preset rule for example, the time-frequency position of the preamble
  • two sets of different RNTI rules can be configured for network equipment and terminal equipment, namely, the first RNTI rule and the second RNTI rule.
  • the rule may generate a first RNTI and a second RNTI respectively, and the first RNTI and the second RNTI respectively correspond to the response message in the first format and the response message in the second format, and the first RNTI and the second RNTI are different.
  • the network device selects the corresponding RNTI rule according to the determined message format to generate an RNTI, and sends a response message through the RNTI.
  • the terminal device simultaneously uses the first RNTI and the second RNTI to receive the response message, and determines the message format of the response message according to the status of receiving the response message.
  • the terminal device may determine that the random access response is a random access response in the first format, that is, the message format is the first format.
  • the terminal device may determine that the random access response is a random access response in the second format, that is, the message format is the second format.
  • protocol in the embodiment of the present application may refer to a standard protocol in the communication field, for example, may include the LTE protocol, the NR protocol, and related protocols applied to future communication systems, which are not limited in this application.
  • the system or protocol can be specified, or can be agreed between the network device and the terminal device.
  • the network device can send a response message according to the following rules:
  • the network device When the message format of the response message determined by the network device is the first format, the network device sends the DCI corresponding to the response message in the first format on the first resource set;
  • the network device When the message format of the response message determined by the network device is the second format, the network device sends the DCI corresponding to the response message in the second format on the second resource set.
  • the terminal device can monitor the DCI corresponding to the response message according to the following rules:
  • the terminal device monitors the DCI corresponding to the response message on the first resource set and the second resource set.
  • the terminal device determines the message format of the response message according to the monitoring status of the DCI corresponding to the response message.
  • two different resource sets can be configured for the network device and the terminal device respectively, namely, a first resource set and a second resource set.
  • the first resource set corresponds to the response message in the first format, and can be passed through
  • a resource set sends the DCI corresponding to the response message in the first format
  • the second resource set corresponds to the response message in the second format
  • the DCI corresponding to the response message in the second format can be sent through the second resource set.
  • the first resource set and the second resource set do not overlap.
  • the first resource set may include a control channel resource set (CORESET) and/or a search space (searching space).
  • CORESET control channel resource set
  • search space searching space
  • the second resource set may include a control channel resource set and/or search space.
  • the network device selects the corresponding resource set according to the determined message format to send the DCI corresponding to the response message.
  • the terminal device simultaneously receives the DCI corresponding to the response message in the first resource set and the second resource in combination, and determines the message format of the response message according to the receiving situation of the DCI corresponding to the response message.
  • the terminal device may determine that the random access response is a random access response in the first format, that is, the message format is the first format.
  • the terminal device may determine that the random access response is a random access response in the second format, that is, the message format is the second format .
  • the first resource set and the second resource set may be specified by the system or protocol, or may be agreed between the network device and the terminal device.
  • the network device can configure the terminal device through semi-static signaling or dynamic signaling.
  • the semi-static signaling may be RRC signaling, for example.
  • the dynamic signaling may be MAC CE or DCI, for example.
  • protocol in the embodiment of the present application may refer to a standard protocol in the communication field, for example, may include the LTE protocol, the NR protocol, and related protocols applied to future communication systems, which are not limited in this application.
  • step 340 the terminal device parses the response message according to the determined message format of the response message.
  • the terminal device can learn the specific meaning of each bit in the response message according to predetermined rules, and can parse the response message in a corresponding manner to learn the message content of the response message.
  • the terminal device when the terminal device determines that the message format of the response message is the first format, it parses the response message according to the first format.
  • the terminal device determines that the message format of the response message is the second format
  • the response message is parsed according to the second format.
  • the embodiment of the present application provides two message formats for response messages, and the network device can choose to use any message format to send the response message to the terminal device according to specific conditions. For example, in order to enable the terminal device to receive the control plane message as soon as possible, the first format may be used to send a response message to the terminal device. For another example, in order to be able to multiplex the response messages of as many terminal devices as possible, thereby improving the utilization of wireless resources, the network device may use the second format to send the response message to the terminal device.
  • the random access response is more flexible and efficient, and can meet different usage requirements.
  • FIG. 17 is a schematic flowchart of a two-step random access method 400 of the present application.
  • a random access method 400 provided in an embodiment of the present application is described with reference to FIG. 17, and the method 400 includes:
  • Step 410 The network device sends a first message to the terminal device on the PDSCH resource, where the first message carries uplink authorization information.
  • the network device first receives a random access request message (that is, corresponding to the MsgA in the preceding two-step random access) sent by the terminal device.
  • the random access request message includes a random access signal and payload data.
  • the random access signal It can be the preamble and/or DMRS, and the content included in the payload data can be different according to different random access trigger scenarios.
  • the payload data may include C-RNTI.
  • the random access trigger scenario may be any one of handover, uplink data arrival and uplink out of synchronization, downlink data arrival and uplink out of synchronization, beam failure recovery, and so on.
  • the network device After receiving the random access request message, the network device needs to decode the random access signal and payload data contained in it.
  • the result of the network equipment decoding the random access signal and the payload data may be the case 2 and the case 4 in Table 3 above, that is, the network equipment should successfully decode the payload data, and the random access signal The decoding result of the access signal is not required.
  • the network device After the network device receives the random access request message and successfully decodes the payload data, it can generate corresponding response information according to the content in the payload data.
  • the response information includes at least uplink authorization information.
  • the network device can send the first message on the PDSCH resource to the terminal device, and the first message carries the uplink authorization information without sending the first information on the PDCCH resource, so that the terminal device can be as soon as possible
  • the terminal device can send the newly transmitted data to the network device as soon as possible or retransmit.
  • the network device may send the first message to the terminal device on the PDSCH resource through the C-RNTI.
  • the network device may scramble the PDCCH through the C-RNTI, the CRC of the corresponding DCI is scrambled through the C-RNTI, the DCI allocates PDSCH resources, and sends the first message on the PDSCH resources.
  • the method further includes:
  • the terminal device sends new data to the network device.
  • the method further includes:
  • the terminal device retransmits to the network device.
  • the first message further includes transmission indication information, and the transmission indication information is used to instruct the terminal device to send newly transmitted data or retransmit.
  • the terminal device determines that it is a new transmission
  • the terminal device when the terminal device determines that it is a new transmission, the terminal device generates a MAC PDU and submits it to the HARQ entity for HARQ transmission.
  • FIG. 18 is a schematic diagram of a communication device according to an embodiment of the present application.
  • the communication device 500 shown in FIG. 18 includes a determining unit 510 and a sending unit 520.
  • the determining unit 510 is configured to determine the message format of the response message, the message format including the first format or the second format, wherein the response message in the first format includes a contention resolution identifier and a control plane message; the response message in the second format is Including the competition resolution logo, and excluding control plane messages;
  • the sending unit 520 is configured to send the response message to the terminal device using the determined message format of the response message.
  • the response message in the first format or the response message in the second format is carried in the media access control MAC protocol data unit PDU.
  • the MAC PDU includes a first MAC subPDU and a second MAC subPDU
  • the contention resolution identifier of the response message in the first format is carried in the first MAC subPDU
  • the control plane of the response message in the first format The message is carried in the second MAC subPDU.
  • the response message in the second format includes N contention resolution identifiers corresponding to the N terminal devices, the N contention resolution identifiers are carried in the MAC PDU, and N is an integer greater than or equal to 2.
  • the MAC PDU includes S MAC sub-PDUs, S is greater than or equal to N, and the N contention resolution identifiers are respectively carried in the N MAC sub-PDUs.
  • the sending unit 520 is further configured to send indication information to the terminal device, where the indication information is used to indicate the message format of the response message.
  • the sending unit 520 uses the first wireless network temporary identifier RNTI to send the response message in the first format; when the message of the response message determined by the determining unit 510 is When the format is the second format, the sending unit 520 uses the second RNTI to send the response message in the second format.
  • the sending unit 520 when the message format of the response message determined by the determining unit 510 is the first format, the sending unit 520 sends the downlink control information DCI corresponding to the response message in the first format on the first resource set; When the message format of the response message determined in 510 is the second format, the sending unit 520 sends the DCI corresponding to the response message in the second format on the second resource set.
  • the first resource set includes a control channel resource set and/or search space
  • the second resource set includes a control channel resource set and/or search space
  • the indication information is carried in the MAC PDU, or the indication information is carried in the DCI corresponding to the response message.
  • the response message in the first format or the response message in the second format further includes at least one of the following information: a timing advance command, a temporary cell radio network temporary identifier C-RNTI, and uplink authorization.
  • control plane message includes any one of the following messages: radio resource control RRC connection establishment, RRC recovery, and RRC re-establishment.
  • the aforementioned communication device 500 may be a network device, such as the base station 80 below, where the function of the processing unit may be implemented by the processor 8022 in the base station, and the function of the transceiver unit may be implemented by the RRU of the base station 80. 801 implementation.
  • the following describes the structure of the network device of the embodiment of the present application in conjunction with FIG. 19.
  • FIG. 19 is a schematic structural diagram of a network device according to an embodiment of the present application, for example, it may be a schematic structural diagram of a base station. As shown in FIG. 19, the base station can be applied to the system shown in FIG. 1 to perform the functions of the network device in the foregoing method embodiment.
  • the base station 80 may include one or more radio frequency units, such as a remote radio unit (RRU) 801 and one or more baseband units (BBU) (also referred to as digital units, digital units, DU) 802.
  • RRU 801 may be called a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., and it may include at least one antenna 8011 and a radio frequency unit 8012.
  • the RRU 801 part is mainly used for receiving and sending of radio frequency signals and conversion of radio frequency signals and baseband signals, for example, for sending the signaling messages described in the foregoing embodiments to terminal equipment.
  • the 802 part of the BBU is mainly used to perform baseband processing and control the base station.
  • the RRU 801 and the BBU 802 may be physically set together, or may be physically separated, that is, a distributed base station.
  • the BBU 802 is the control center of the base station, and may also be called a processing unit, which is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, and spreading.
  • the BBU (processing unit) 802 may be used to control the base station to execute the operation procedure of the network device in the foregoing method embodiment.
  • the BBU 802 may be composed of one or more single boards, and multiple single boards may jointly support a radio access network with a single access indication (such as an LTE network), and may also support different access standards. Wireless access network (such as LTE network, 5G network or other networks).
  • the BBU 802 further includes a memory 8021 and a processor 8022, and the memory 8021 is used to store necessary instructions and data.
  • the memory 8021 stores the corresponding relationship between the codebook index and the precoding matrix in the foregoing embodiment.
  • the processor 8022 is used to control the base station to perform necessary actions, for example, to control the base station to execute the operation procedure of the network device in the foregoing method embodiment.
  • the memory 8021 and the processor 8022 may serve one or more single boards. In other words, the memory and the processor can be set separately on each board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits can be provided on each board.
  • FIG. 20 is a schematic diagram of a communication device according to another embodiment of the present application.
  • the communication device 600 shown in FIG. 20 includes a receiving unit 610, a determining unit 620, and an analyzing unit 630.
  • the receiving unit 610 is configured to receive a response message sent by a network device
  • the determining unit 620 is configured to determine the message format of the response message, the message format including the first format or the second format, wherein the response message in the first format includes a contention resolution identifier and a control plane message; the response message in the second format is Including the competition resolution logo, and excluding control plane messages;
  • the parsing unit 630 is configured to parse the response message according to the determined message format of the response message.
  • the response message in the first format or the response message in the second format is carried in the media access control MAC protocol data unit PDU.
  • the MAC PDU includes a first MAC subPDU and a second MAC subPDU
  • the contention resolution identifier of the response message in the first format is carried in the first MAC subPDU
  • the control plane of the response message in the first format The message is carried in the second MAC subPDU.
  • the response message in the second format includes N contention resolution identifiers corresponding to the N terminal devices, the N contention resolution identifiers are carried in the MAC PDU, and N is an integer greater than or equal to 2.
  • the MAC PDU includes S MAC sub-PDUs, S is greater than or equal to N, and the N contention resolution identifiers are respectively carried in the N MAC sub-PDUs.
  • the receiving unit 610 uses the first wireless network temporary identifier RNTI and the second RNTI to receive the response message; the determining unit 620 determines the message format of the response message according to the status of receiving the response message.
  • the receiving unit 610 monitors the DCI corresponding to the response message on the first resource set and the second resource set; the determining unit 620 determines the message format of the response message according to the monitoring status of the DCI corresponding to the response message.
  • the first resource set includes a control channel resource set and/or search space
  • the second resource set includes a control channel resource set and/or search space
  • the indication information is carried in the MAC PDU, or the indication information is carried in the DCI corresponding to the response message.
  • the response message in the first format or the response message in the second format further includes at least one of the following information: a timing advance command, a temporary cell radio network temporary identifier C-RNTI, and uplink authorization.
  • control plane message includes any one of the following messages: radio resource control RRC connection establishment, RRC recovery, and RRC re-establishment.
  • the above-mentioned communication device 600 may be a terminal device 70, wherein the function of the processing unit may be realized by the processor 702 in the terminal device, and the function of the transceiver unit may be controlled by the transceiver 701 of the terminal device.
  • the circuit is implemented together with the antenna. The following describes the structure of the terminal device of the embodiment of the present application in conjunction with FIG. 21.
  • FIG. 21 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
  • the terminal device can be applied to the system shown in FIG. 1 to perform the functions of the terminal device in the foregoing method embodiment.
  • FIG. 21 only shows the main components of the terminal device.
  • the terminal device 70 includes a processor, a memory, a control circuit, an antenna, and an input and output device.
  • the processor is mainly used to process the communication protocol and communication data, and to control the entire terminal device, execute the software program, and process the data of the software program, for example, to support the terminal device to perform the actions described in the above method embodiment.
  • the memory is mainly used to store software programs and data.
  • the control circuit is mainly used for the conversion of baseband signals and radio frequency signals and the processing of radio frequency signals.
  • the control circuit and the antenna together can also be called a transceiver, which is mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
  • Input and output devices such as touch screens, display screens, and keyboards, are mainly used to receive data input by users and output data to users.
  • the processor can read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program.
  • the processor performs baseband processing on the data to be sent and outputs the baseband signal to the radio frequency circuit.
  • the radio frequency circuit performs radio frequency processing on the baseband signal and then sends the radio frequency signal to the outside in the form of electromagnetic waves through the antenna.
  • the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data.
  • FIG. 21 only shows one memory and one processor. In an actual terminal device, there may be multiple processors and multiple memories.
  • the memory may also be called a storage medium or a storage device, etc., which is not limited in the embodiment of the present application.
  • the processor may include a baseband processor and a central processing unit.
  • the baseband processor is mainly used to process communication protocols and communication data.
  • the central processing unit is mainly used to control the entire terminal device and execute Software program, processing the data of the software program.
  • the processor in FIG. 21 can integrate the functions of the baseband processor and the central processing unit.
  • the baseband processor and the central processing unit can also be independent processors and are interconnected by technologies such as buses.
  • the terminal device may include multiple baseband processors to adapt to different network standards, the terminal device may include multiple central processors to enhance its processing capabilities, and various components of the terminal device may be connected through various buses.
  • the baseband processor can also be expressed as a baseband processing circuit or a baseband processing chip.
  • the central processing unit can also be expressed as a central processing circuit or a central processing chip.
  • the function of processing the communication protocol and communication data can be built in the processor, or can be stored in the storage unit in the form of a software program, and the processor executes the software program to realize the baseband processing function.
  • the processor in the embodiment of the present application may be a central processing unit (Central Processing Unit, CPU), and the processor may also be other general-purpose processors, digital signal processors (digital signal processors, DSP), and dedicated integration Circuit (application specific integrated circuit, ASIC), ready-made programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the memory in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electronic Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (RAM), which is used as an external cache.
  • RAM random access memory
  • static random access memory static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • Access memory synchronous DRAM, SDRAM
  • double data rate synchronous dynamic random access memory double data rate SDRAM, DDR SDRAM
  • enhanced synchronous dynamic random access memory enhanced SDRAM, ESDRAM
  • synchronous connection dynamic random access memory Take memory (synchlink DRAM, SLDRAM) and direct memory bus random access memory (direct rambus RAM, DR RAM).
  • the present application also provides a computer program product, the computer program product includes: computer program code, when the computer program code runs on a computer, the computer executes the computer program shown in FIG. 7 or 17 The method of any one of the embodiments.
  • the present application also provides a computer-readable medium that stores program code, and when the program code runs on a computer, the computer executes the steps shown in FIG. 7 or 17 The method of any one of the embodiments.
  • the present application also provides a system, which includes the aforementioned one or more terminal devices and one or more network devices.
  • the foregoing embodiments can be implemented in whole or in part by software, hardware, firmware or any other combination.
  • the above-mentioned embodiments may be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer instructions or computer programs.
  • the computer instructions or computer programs are loaded or executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more sets of available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium.
  • the semiconductor medium may be a solid state drive.
  • "indication” may include direct indication and indirect indication, and may also include explicit indication and implicit indication.
  • the information indicated by a certain information (such as the "instruction information" in the preceding text) is called the information to be indicated.
  • Indication information such as the information to be indicated or the index of the information to be indicated, etc.
  • the information to be indicated can also be indicated indirectly by indicating other information, where there is an association relationship between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, and other parts of the information to be indicated are known or agreed in advance. For example, it is also possible to realize the indication of specific information by means of the pre-arranged order (for example, stipulated in the agreement) of various information, thereby reducing the indication overhead to a certain extent.
  • MAC PDU media access control protocol data unit
  • C-RNTI cell radio network temporary identification
  • DCI downlink control information
  • MAC CE media access control control Elements
  • RRC Radio Resource Control
  • PDCCH Physical Downlink Control Channel
  • the "communication protocol” involved in the embodiments of the present application may refer to a standard protocol in the communication field, for example, may include the LTE protocol, the NR protocol, and related protocols applied to future communication systems, which are not limited in this application.
  • the size of the sequence number of the above-mentioned processes does not mean the order of execution.
  • the execution order of each process should be determined by its function and internal logic, and should not correspond to the implementation process of this embodiment Constitute any limitation.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • each unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of this application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

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Abstract

本申请提供了一种随机接入的方法和通信装置，该方法包括：终端设备接收网络设备发送的响应消息；所述终端设备确定所述响应消息的消息格式，所述消息格式包括第一格式或者第二格式；所述终端设备根据确定的所述消息格式对所述响应消息进行解析；其中，第一格式的响应消息，包括竞争解决标识和控制面消息，第二格式的响应消息，包括竞争解决标识，且不包括控制面消息。本申请提供的两步随机接入的方法，包括两种随机接入响应的消息格式，网络设备能够根据具体情况选择使用任意一种消息格式向终端设备发送随机接入响应，使得随机接入响应更加灵活、高效，能够满足不同的使用需求。

Description

一种随机接入的方法及通信装置
本申请要求于2019年06月28日提交中国专利局、申请号为201910573570.2、申请名称为“一种随机接入的方法及通信装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，并且更具体地，涉及一种随机接入的方法及通信装置。
背景技术
在无线通信系统中，终端设备需要和网络建立连接，这一过程通常被称为随机接入(random access，RA)过程。通过随机接入，终端设备可以与网络建立上行同步，并获得唯一的小区无线网络临时标识(cell-Radio network temporary identifier，C-RNTI)。随机接入的目的就是建立同步，只有取得上行同步，终端设备才能进行上行传输。此外，随机接入还有一个特殊的用途：如果物理上行控制信道(physical uplink control channel，PUCCH)上没有配置专用的调度请求(scheduling request，SR)资源或SR失败时，可以借助随机接入来申请调度资源。
在长期演进(long term evolution，LTE)系统和第五代移动通信(5G)新空口(new radio，NR)系统中，随机接入过程包括竞争和非竞争两种方式。基于竞争的随机接入过程通常由以下步骤组成：终端设备在随机接入前导序列集合中随机选取一个随机接入前导码(random access preamble，RAP)，并在网络设备预先指定的随机接入资源(例如，物理随机接入信道(physical random access channel，PRACH))上发送选择的RAP；终端设备在物理下行共享信道(physical downlink shared channel，PDSCH)上接收来自网络设备下发的随机接入响应(random access response，RAR)消息；终端设备根据RAR消息中包含的C-RNTI，在RAR消息中指定的物理上行共享信道(physical uplink shared channel，PUSCH)上向基站发送包括用于竞争解决的消息；并且终端设备需要接收来自基站发送的竞争解决消息，从而完成随机接入过程。
为了缩短随机接入过程产生的时延，5G NR目前正在讨论两步随机接入机制。两步随机接入机制通常包括以下步骤：终端设备发送RAP以及数据(payload)给基站；基站根据RAP和/或数据的解码情况，向终端设备发送响应消息。目前，两步随机接入机制中响应消息的格式问题还没有被明确，造成两步随机接入机制不完整，无法保证网络通信的可靠性。
发明内容
本申请提供一种随机接入的方法及通信装置，能够使响应消息更加灵活、高效，能够满足不同的使用需求。
第一方面，提供了一种随机接入的方法，该方法可以由终端设备执行，或者，也可以由配置于终端设备中的芯片或电路执行，本申请对此不作限定。
具体地，该方法包括：终端设备接收网络设备发送的响应消息；终端设备确定响应消息的消息格式，消息格式包括第一格式或者第二格式；终端设备根据确定的响应消息的消息格式对所述响应消息进行解析；其中，第一格式的响应消息，包括竞争解决标识和控制面消息，第二格式的响应消息，包括竞争解决标识，且不包括控制面消息。
示例的，第一格式又可以称为Format 1B，第二格式又可以称为Format 1A，或者，第一格式又可以称为Format 1A，第二格式又可以称为Format 1B，本申请对第一格式或者第二格式的具体名称不做限制。
其中，本申请所述的响应消息是指对请求随机接入的响应消息，也可以称为随机接入响应(消息)。
本申请在第一格式的响应消息中，包括竞争解决标识和控制面消息。而在第二格式的响应消息中，包括竞争解决标识但是不包括控制面消息(控制面消息可以在以后的消息中发送)。网络设备可以根据具体情况确定选择哪种消息格式发送响应消息。例如，为了使终端设备尽快接收到控制面消息，可以使用第一格式向终端设备发送响应消息。再例如，为了能够使尽量多的终端设备的响应消息复用在一起(此时一个终端设备所占用的比特数不宜过多)，从而能够提高无线资源利用率，网络设备可以使用第二格式向终端设备发送响应消息。终端设备接收到该响应消息之后，可以首先确定消息格式，之后根据对应的格式对响应消息进行解析。
本申请实施例提供的随机接入的方法，同时也提供了两种响应消息的消息格式，并且网络设备能够根据具体情况选择使用任意一种消息格式向终端设备发送响应消息，使得响应消息更加灵活、高效，能够满足不同的使用需求。
应理解，第一格式的响应消息或第二格式的响应消息中还可以包括其他内容，本申请对此并不限定。
可选地，第一格式的响应消息或第二格式的响应消息中还包括以下信息中的至少一种：定时提前量命令、临时小区无线网络临时标识C-RNTI、上行授权。
该控制面消息也可以看作是基于调度传输的应答消息，可选地，该控制面消息包括以下消息中的任意一种：初始接入场景的无线资源控制RRC连接建立消息、inactive态状态转换场景的RRC恢复消息、RRC连接重建立场景的RRC重建立消息。
可选地，作为一种替换方式，第二格式的响应消息不仅包括竞争解决标识，还包括N个终端设备各自对应的以下信息中的至少一种：定时提前量命令、临时小区无线网络临时标识C-RNTI、上行授权等，本申请对此并不限定。或者，第二格式的响应消息可以不包括竞争解决标识，而包括N个终端设备各自对应的以下信息中的至少一种：定时提前量命令、临时小区无线网络临时标识C-RNTI、上行授权等，本申请对此并不限定。
结合第一方面，在第一方面的某些实现方式中，第一格式的响应消息或者第二格式的响应消息携带于媒体接入控制MAC协议数据单元PDU中。
结合第一方面，在第一方面的某些实现方式中，该MAC PDU包括第一MAC子PDU和第二MAC子PDU，第一格式的响应消息的竞争解决标识携带于第一MAC子PDU中，第一格式的响应消息的控制面消息携带于第二MAC子PDU中。
应理解，上述第一MAC子PDU和第二MAC子PDU内的竞争解决标识和控制面消息属于同一个终端设备。
可选地，第一格式的响应消息的竞争解决标识和控制面消息也可以均携带于同一个MAC子PDU中。
可选地，第一格式的响应消息的竞争解决标识和控制面消息也可以携带于3个或者3个以上的MAC子PDU中，本申请对此并不限定。
可选地，第一格式的响应消息中还可能包括定时提前量命令、临时C-RNTI、上行授权等其他内容，上述其他内容可以和竞争解决标识携带于同一个MAC子PDU中。
结合第一方面，在第一方面的某些实现方式中，第二格式的响应消息包括N个终端设备对应的N个竞争解决标识，该N个竞争解决标识携带于MAC PDU中，N为大于或者等于2的整数。从而能够使多个终端设备的响应消息共用在一起，提高无线资源的利用率。
结合第一方面，在第一方面的某些实现方式中，该MAC PDU包括S个MAC子PDU，S大于或者等于N，该N个竞争解决标识分别携带于N个MAC子PDU中。这样可以使多个终端设备的响应消息复用同一个MAC PDU，可以提高无线资源的利用率。
可选地，该MAC PDU中不包括该N个终端设备中任意一个终端设备对应的控制面消息，从而可以是更多的终端设备的响应消息复用该MAC PDU，或者说，从而可以使该MAC PDU的尺寸不会太大。
可选地，该N个竞争解决标识也可以携带于大于或者小于N个MAC子PDU中，例如，可以多个竞争解决标识复用到一个MAC子PDU，或者，一个竞争解决标识携带于一个或者多个MAC子PDU中，本申请对此并不限定。
类似地，针对每个终端设备，其响应消息还可能包括定时提前量命令、临时C-RNTI、上行授权等其他内容，因此每个终端设备对应的上述其他内容可以和自身的竞争解决标识携带于同一个MAC子PDU中。
结合第一方面，在第一方面的某些实现方式中，该方法还包括：终端设备接收网络设备发送的指示信息，指示信息用于指示响应消息的消息格式。
可选地，指示信息可以携带于该MAC PDU中，或者，指示信息可以携带于响应消息所对应的DCI中。
可选地，指示信息可以携带于MAC PDU中的MAC子PDU中，或MAC子头(MAC subheader)中。
可选地，该指示信息可以携带于MAC子头中的预留比特域中，例如，可以通过预留比特域的一个比特位是0还是1来指示响应消息的消息格式为第一格式还是第二格式。
可选地，该指示信息也可以携带于MAC子PDU中的类型指示域中，通过类型指示域指示该MAC子PDU是固定长度还是可变长度来间接指示响应消息的消息格式为第一格式还是第二格式。
可选地，该指示信息也可以携带于MAC子PDU中。例如，该MAC子PDU可以为专用的MAC子PDU，专门用于携带该指示信息。
结合第一方面，在第一方面的某些实现方式中，终端设备接收网络设备发送的响应消息，包括：终端设备使用第一无线网络临时标识RNTI和第二RNTI接收响应消息；终端设备确定响应消息的消息格式，包括：终端设备根据对响应消息的接收情况确定响应消息 的消息格式。
具体地，终端设备同时使用第一RNTI和第二RNTI接收响应消息，并且根据对响应消息的接收情况确定响应消息的消息格式。
例如，如果使用第一RNTI成功的接收到该响应消息，则终端设备可以确定该响应消息为第一格式的响应消息，即消息格式为第一格式。
再例如，如果使用第二RNTI成功的接收到该响应消息，则终端设备可以确定该响应消息为第二格式的响应消息，即消息格式为第二格式。
结合第一方面，在第一方面的某些实现方式中，终端设备接收网络设备发送的响应消息，包括：终端设备在第一资源集合和第二资源结合上监听响应消息所对应的DCI；终端设备确定所述响应消息的消息格式，包括：终端设备根据对响应消息所对应的DCI的监听情况确定所述响应消息的消息格式。
具体地，终端设备同时在第一资源集合和第二资源集合监听响应消息对应的DCI，并且根据对响应消息对应的DCI的监听情况确定响应消息的消息格式。
例如，如果在第一资源集合上成功的监听到该响应消息对应的DCI，则终端设备可以确定该响应消息为第一格式的响应消息，即消息格式为第一格式。
再例如，如果在第二资源集合上成功的监听到该响应消息对应的DCI，则终端设备可以确定该响应消息为第二格式的响应消息，即消息格式为第二格式。
结合第一方面，在第一方面的某些实现方式中，第一资源集合包括控制信道资源集合和/或搜索空间，第二资源集合包括控制信道资源集合和/或搜索空间。
第二方面，提供了一种随机接入的方法，该方法可以由网络设备执行，或者，也可以由配置于网络设备中的芯片或电路执行，本申请对此不作限定。
具体地，该方法包括：网络设备确定响应消息的消息格式，消息格式包括第一格式或者第二格式，网络设备使用确定的消息格式向终端设备发送响应消息；其中，第一格式的响应消息，包括竞争解决标识和控制面消息，第二格式的响应消息，包括竞争解决标识，且不包括控制面消息。
本申请在第一格式的响应消息中，包括竞争解决标识和控制面消息。而在第二格式的响应消息中，包括竞争解决标识但是不包括控制面消息(控制面消息可以在以后的消息中发送)。网络设备可以根据具体情况确定选择哪种消息格式发送响应消息。例如，为了使终端设备尽快接收到控制面消息，可以使用第一格式向终端设备发送响应消息。再例如，为了能够使尽量多的终端设备的响应消息复用在一起(此时一个终端设备所占用的比特数不宜过多)，从而能够提高无线资源利用率，网络设备可以使用第二格式向终端设备发送响应消息。
本申请实施例提供的随机接入的方法，同时也提供了两种响应消息的消息格式，并且网络设备能够根据具体情况选择使用任意一种消息格式向终端设备发送响应消息，使得响应消息更加灵活、高效，能够满足不同的使用需求。
应理解，第一格式的响应消息或第二格式的响应消息中还可以包括其他内容，本申请对此并不限定。
可选地，第一格式的响应消息或第二格式的响应消息中还包括以下信息中的至少一种：定时提前量命令、临时小区无线网络临时标识C-RNTI、上行授权。
该控制面消息也可以看作是基于调度传输的应答消息，可选地，该控制面消息包括以下信息中的任意一种：初始接入场景的无线资源控制RRC连接建立消息、inactive态状态转换场景的RRC恢复消息、RRC连接重建立场景的RRC重建立消息。
可选地，作为一种替换方式，第二格式的响应消息不仅包括竞争解决标识，还包括N个终端设备各自对应的以下信息中的至少一种：定时提前量命令、临时小区无线网络临时标识C-RNTI、上行授权等，本申请对此并不限定。或者，第二格式的响应消息可以不包括竞争解决标识，而包括N个终端设备各自对应的以下信息中的至少一种：定时提前量命令、临时小区无线网络临时标识C-RNTI、上行授权等，本申请对此并不限定。
结合第二方面，在第二方面的某些实现方式中，第一格式的响应消息或者第二格式的响应消息携带于媒体接入控制MAC协议数据单元PDU中。
结合第二方面，在第二方面的某些实现方式中，该MAC PDU包括第一MAC子PDU和第二MAC子PDU，第一格式的响应消息的竞争解决标识携带于第一MAC子PDU中，第一格式的响应消息的控制面消息携带于第二MAC子PDU中。
可选地，第一格式的响应消息的竞争解决标识和控制面消息也可以均携带于同一个MAC子PDU中。
可选地，第一格式的响应消息的竞争解决标识和控制面消息也可以携带于3个或者3个以上的MAC子PDU中，本申请对此并不限定。
可选地，第一格式的响应消息中还可能包括定时提前量命令、临时C-RNTI、上行授权等其他内容，上述其他内容可以和竞争解决标识携带于同一个MAC子PDU中。
结合第二方面，在第二方面的某些实现方式中，第二格式的响应消息包括N个终端设备对应的N个竞争解决标识，该N个竞争解决标识携带于该MAC PDU中，N为大于或者等于2的整数。从而能够使多个终端设备的响应消息共用在一起，提高无线资源的利用率。
结合第二方面，在第二方面的某些实现方式中，该MAC PDU包括S个MAC子PDU，S大于或者等于N，该N个竞争解决标识分别携带于N个MAC子PDU中。这样可以使多个终端设备的响应消息复用同一个MAC PDU，可以提高无线资源的利用率。
可选地，该MAC PDU中不包括该N个终端设备中任意一个终端设备对应的控制面消息，从而可以是更多的终端设备的响应消息复用该MAC PDU，或者说，从而可以使该MAC PDU的尺寸不会太大。
可选地，该N个竞争解决标识也可以携带于大于或者小于N个MAC子PDU中，例如，可以多个竞争解决标识复用到一个MAC子PDU，或者，一个竞争解决标识携带于一个或者更多个MAC子PDU中，本申请对此并不限定。
类似地，针对每个终端设备，其响应消息还可能包括定时提前量命令、临时C-RNTI、上行授权等其他内容，因此每个终端设备对应的上述其他内容可以和自身的竞争解决标识携带于同一个MAC子PDU中。
结合第二方面，在第二方面的某些实现方式中，该方法还包括：网络设备向终端设备发送指示信息，指示信息用于指示所述响应消息的消息格式。
可选地，指示信息可以携带于该MAC PDU中，或者，指示信息可以携带于响应消息所对应的DCI中。
可选地，指示信息可以携带于MAC PDU中的MAC子PDU中，或MAC子头中。
可选地，该指示信息可以携带于MAC子头中的预留比特域中，例如，可以通过预留比特域的一个比特位是0还是1来指示响应消息的消息格式为第一格式还是第二格式。
可选地，该指示信息也可以携带于MAC子PDU中的类型指示域中，通过类型指示域指示该MAC子PDU是固定长度还是可变长度来间接指示响应消息的消息格式为第一格式还是第二格式。
可选地，该指示信息也可以携带于MAC子PDU中。例如，该MAC子PDU可以为专用的MAC子PDU，专门用于携带该指示信息。
结合第二方面，在第二方面的某些实现方式中，网络设备使用确定的响应消息的消息格式向终端设备发送响应消息，包括：当网络设备确定的响应消息的消息格式为第一格式时，网络设备使用第一无线网络临时标识RNTI发送所述第一格式的响应消息；当网络设备确定的响应消息的消息格式为第二格式时，网络设备使用第二RNTI发送第二格式的响应消息。
结合第二方面，在第二方面的某些实现方式中，网络设备使用确定的响应消息的消息格式向终端设备发送响应消息，包括：当网络设备确定的响应消息的消息格式为第一格式时，网络设备在第一资源集合上发送第一格式的响应消息所对应的下行控制信息DCI；当网络设备确定的响应消息的消息格式为第二格式时，网络设备在第二资源集合上发送第二格式的响应消息所对应的DCI。
可选地，第一资源集合包括控制信道资源集合和/或搜索空间，第二资源集合包括控制信道资源集合和/或搜索空间。
第三方面，提供了一种通信装置，该通信装置包括：接收单元，用于接收网络设备发送的响应消息；确定单元，用于确定响应消息的消息格式，该消息格式包括第一格式或者第二格式，其中，第一格式的响应消息，包括竞争解决标识和控制面消息，第二格式的响应消息，包括竞争解决标识，且不包括控制面消息；解析单元，用于根据确定的响应消息的消息格式对所述响应消息进行解析。
结合第三方面，在第三方面的某些实现方式中，第一格式的响应消息或者第二格式的响应消息携带于媒体接入控制MAC协议数据单元PDU中。
结合第三方面，在第三方面的某些实现方式中，该MAC PDU包括第一MAC子PDU和第二MAC子PDU，第一格式的响应消息的竞争解决标识携带于第一MAC子PDU中，第一格式的响应消息的控制面消息携带于第二MAC子PDU中。
结合第三方面，在第三方面的某些实现方式中，第二格式的响应消息包括N个终端设备对应的N个竞争解决标识，该N个竞争解决标识携带于MAC PDU中，N为大于或者等于2的整数。
结合第三方面，在第三方面的某些实现方式中，该MAC PDU包括S个MAC子PDU，S大于或者等于N，该N个竞争解决标识分别携带于N个MAC子PDU中。
结合第三方面，在第三方面的某些实现方式中，该方法还包括：终端设备接收网络设备发送的指示信息，指示信息用于指示响应消息的消息格式。
结合第三方面，在第三方面的某些实现方式中，接收单元使用第一无线网络临时标识RNTI和第二RNTI接收响应消息；确定单元根据对响应消息的接收情况确定响应消息的 消息格式。
结合第三方面，在第三方面的某些实现方式中，接收单元在第一资源集合和第二资源结合上监听响应消息所对应的DCI；确定单元根据对响应消息所对应的DCI的监听情况确定所述响应消息的消息格式。
结合第三方面，在第三方面的某些实现方式中，第一资源集合包括控制信道资源集合和/或搜索空间，第二资源集合包括控制信道资源集合和/或搜索空间。
结合第三方面，在第三方面的某些实现方式中，指示信息携带于所述MAC PDU中，或者，指示信息携带于响应消息所对应的DCI中。
结合第三方面，在第三方面的某些实现方式中，第一格式的响应消息或第二格式的响应消息中还包括以下信息中的至少一种：定时提前量命令、临时小区无线网络临时标识C-RNTI、上行授权。
结合第三方面，在第三方面的某些实现方式中，控制面消息包括以下信息中的任意一种：无线资源控制RRC连接建立、RRC恢复、RRC重建立。
第四方面，提供了一种通信装置，该通信装置包括：确定单元，用于确定响应消息的消息格式，该消息格式包括第一格式或者第二格式，其中，第一格式的响应消息，包括竞争解决标识和控制面消息，第二格式的响应消息，包括竞争解决标识，且不包括控制面消息；发送单元，用于使用确定的响应消息的消息格式向终端设备发送所述响应消息。
结合第四方面，在第四方面的某些实现方式中，第一格式的响应消息或者第二格式的响应消息携带于媒体接入控制MAC协议数据单元PDU中。
结合第四方面，在第四方面的某些实现方式中，该MAC PDU包括第一MAC子PDU和第二MAC子PDU，第一格式的响应消息的竞争解决标识携带于第一MAC子PDU中，第一格式的响应消息的所述控制面消息携带于第二MAC子PDU中。
结合第四方面，在第四方面的某些实现方式中，第二格式的响应消息包括N个所述终端设备对应的N个竞争解决标识，该N个竞争解决标识携带于该MAC PDU中，N为大于或者等于2的整数。
结合第四方面，在第四方面的某些实现方式中，该MAC PDU包括S个MAC子PDU，S大于或者等于N，该N个竞争解决标识分别携带于N个MAC子PDU中。
结合第四方面，在第四方面的某些实现方式中，发送单元还用于向所述终端设备发送指示信息，指示信息用于指示响应消息的消息格式。
结合第四方面，在第四方面的某些实现方式中，当确定单元确定的响应消息的消息格式为第一格式时，发送单元使用第一无线网络临时标识RNTI发送第一格式的响应消息；当确定单元确定的响应消息的消息格式为第二格式时，发送单元使用第二RNTI发送所述第二格式的响应消息。
结合第四方面，在第四方面的某些实现方式中，当确定单元确定的响应消息的消息格式为第一格式时，发送单元在第一资源集合上发送所述第一格式的响应消息所对应的下行控制信息DCI；当确定单元确定的响应消息的消息格式为第二格式时，发送单元在第二资源集合上发送所述第二格式的响应消息所对应的DCI。
结合第四方面，在第四方面的某些实现方式中，第一资源集合包括控制信道资源集合和/或搜索空间，第二资源集合包括控制信道资源集合和/或搜索空间。
结合第四方面，在第四方面的某些实现方式中，指示信息携带于该MAC PDU中，或者，指示信息携带于响应消息所对应的DCI中。
结合第四方面，在第四方面的某些实现方式中，第一格式的响应消息或第二格式的响应消息中还包括以下信息中的至少一种：定时提前量命令、临时小区无线网络临时标识C-RNTI、上行授权。
结合第四方面，在第四方面的某些实现方式中，控制面消息包括以下消息中的任意一种：无线资源控制RRC连接建立、RRC恢复、RRC重建立。
第五方面，提供一种通信装置，该装置可以是终端设备，也可以是终端设备内的芯片。该装置可以包括处理单元和收发单元。当所述装置是终端设备时，所述处理单元可以是处理器，所述收发单元可以是收发器；所述终端设备还可以包括存储单元，所述存储单元可以是存储器；所述存储单元用于存储指令，所述处理单元执行所述存储单元所存储的指令，以使所述终端设备执行第一方面中的方法。当所述装置是终端设备内的芯片时，所述处理单元可以是处理器，所述收发单元可以是输入/输出接口、管脚或电路等；处理单元执行存储单元所存储的指令，以使终端设备执行第一方面中的方法，存储单元可以是所述芯片内的存储单元(例如，寄存器、缓存等)，也可以是所述终端设备内的位于所述芯片外部的存储单元(例如，只读存储器、随机存取存储器等)。
第六方面，提供一种通信装置，该装置可以是网络设备，也可以是网络设备内的芯片。该装置可以包括处理单元和收发单元。当所述装置是网络设备时，所述处理单元可以是处理器，所述收发单元可以是收发器；所述网络设备还可以包括存储单元，所述存储单元可以是存储器；所述存储单元用于存储指令，所述处理单元执行所述存储单元所存储的指令，以使所述网络设备执行第二方面中的方法。当所述装置是网络设备内的芯片时，所述处理单元可以是处理器，所述收发单元可以是输入/输出接口、管脚或电路等；所述处理单元执行存储单元所存储的指令，以使所述网络设备执行第二方面中的方法，所述存储单元可以是所述芯片内的存储单元(例如，寄存器、缓存等)，也可以是所述网络设备内的位于所述芯片外部的存储单元(例如，只读存储器、随机存取存储器等)。
第七方面，提供一种通信装置，包括至少一个处理器，该至少一个处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现第一方面或者第二方面中的任一种方法。
第八方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序代码，当所述计算机程序代码在计算机上运行时，使得计算机执行上述第一方面或者第二方面中的方法。
需要说明的是，上述计算机程序代码可以全部或者部分存储在第一存储介质上，其中第一存储介质可以与处理器封装在一起的，也可以与处理器单独封装，本申请对此不作具体限定。
第九方面，提供了一种计算机可读介质，所述计算机可读介质存储有程序代码，当所述计算机程序代码在计算机上运行时，使得计算机执行上述第一方面或第二方面中的方法。
附图说明
图1示出了适用于本申请实施例的通信系统的示意图。
图2示出了LTE系统和5G NR系统的竞争随机接入的流程图。
图3示出了5G NR系统的两步随机接入的流程图。
图4示出了层2协议栈的结构示意图。
图5示出了MAC PDU的一例的示意性结构图。
图6示出了MAC子头的一例的示意性结构图。
图7示出了随机接入的方法的一例的示意性流程图。
图8示出了第一格式的响应消息携带于MAC PDU中的一例的示意图。
图9示出了竞争解决标识携带于第一MAC子PDU中的结构示意图。
图10示出了控制面消息携带于第二MAC子PDU中的结构示意图。
图11示出了第一MAC子PDU的另一例的示意图。
图12示出了第一MAC子PDU的再一例的示意图。
图13示出了第一MAC子PDU的再一例的示意图。
图14示出了第一MAC子PDU的再一例的示意图。
图15示出了第一MAC子PDU的再一例的示意图。
图16示出了第二格式的响应消息携带于MAC PDU中的一例的示意图。
图17是本申请随机接入的方法的另一例的示意性流程图。
图18是本申请实施例的通信设备的示意图。
图19是本申请实施例的一种网络设备的结构示意图。
图20是本申请另一实施例的通信设备的示意图。
图21是本申请实施例的一种终端设备的结构示意图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通讯(global system for mobile communications，GSM)系统、码分多址(code division multiple access，CDMA)系统、宽带码分多址(wideband code division multiple access，WCDMA)系统、通用分组无线业务(general packet radio service，GPRS)、长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)、通用移动通信系统(universal mobile telecommunication system，UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统、未来的第五代(5th generation，5G)通信系统或新无线接入技术(new radio access technology，NR)等。
为便于理解本申请实施例，首先结合图1详细说明适用于本申请实施例的通信系统。图1示出了适用于本申请实施例的适用的通信系统的示意图。如图1所示，该通信系统10可以包括至少一个网络设备，例如图1所示的网络设备11；该通信系统10还可以包括至少一个终端设备，例如图1所示的终端设备12。网络设备11与终端设备12可通过无线链路通信。各通信设备，如网络设备11或终端设备12，可以配置多个天线，该多个天线可以包括至少一个用于发送信号的发射天线和至少一个用于接收信号的接收天线。另外，各通信设备还附加地包括发射机链和接收机链，本领域普通技术人员可以理解，它们 均可包括与信号发送和接收相关的多个部件(例如处理器、调制器、复用器、解调器、解复用器或天线等)。因此，网络设备11与终端设备12可通过多天线技术通信。
应理解，该无线通信系统中的网络设备可以是任意一种具有无线收发功能的设备。该设备包括但不限于：演进型节点B(evolved NodeB，eNB或eNodeB)、无线网络控制器(radio network controller，RNC)、节点B(Node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station，BTS)、家庭基站(例如，home evolved NodeB，或home Node B，HNB)、基带单元(base band unit，BBU)，无线保真(wireless fidelity，WIFI)系统中的接入点(access point，AP)、无线中继节点、无线回传节点、传输点(transmission point，TP)或者发送接收点(transmission and reception point，TRP)等，还可以为5G，如，NR，系统中的gNB，或，传输点(TRP或TP)，5G系统中的基站的一个或一组(包括多个天线面板)天线面板，或者，还可以为构成gNB或传输点的网络节点，如基带单元(BBU)，或，分布式单元(distributed unit，DU)等。
在一些部署中，gNB可以包括集中式单元(centralized unit，CU)和DU。gNB还可以包括射频单元(radio unit，RU)。CU实现gNB的部分功能，DU实现gNB的部分功能，比如，CU实现无线资源控制(radio resource control，RRC)，分组数据汇聚层协议(packet data convergence protocol，PDCP)层的功能，DU实现无线链路控制(radio link control，RLC)层、媒体接入控制(media access control，MAC)层和物理(physical，PHY)层的功能。由于RRC层的信息最终会变成PHY层的信息，或者，由PHY层的信息转变而来，因而，在这种架构下，高层信令，如RRC层信令，也可以认为是由DU发送的，或者，由DU+CU发送的。可以理解的是，网络设备可以为CU节点、或DU节点、或包括CU节点和DU节点的设备。此外，CU可以划分为接入网(radio access network，RAN)中的网络设备，也可以将CU划分为核心网(core network，CN)中的网络设备，本申请对此不做限定。
还应理解，该无线通信系统中的终端设备也可以称为用户设备(user equipment，UE)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。本申请的实施例中的终端设备可以是手机(mobile phone)、平板电脑(pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality，AR)终端设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等等。本申请的实施例对应用场景不做限定。
为便于理解本申请实施例，首先对本申请中涉及到的相关技术内容作简单说明。
1、四步随机接入
在LTE系统和5G NR系统中，以下几种情况通常需要进行随机接入过程：终端设备初始接入，由空闲态转换到连接态；在无线连接中断后重新建立RRC连接；切换时终端设备需要和目标小区建立上行同步；在终端设备处于连接态但终端设备上行不同步时，此时有上行或者下行数据到达，需通过随机接入建立上行同步；在使用基于上行测量进行用户定位时；在PUCCH上没有分配专门的调度请求资源时，通过随机接入申请上行资源。
随着5G NR系统的进一步讨论，随机接入可能会引入新的场景。如：不活跃(inactive)状态下下行数据(DL data)到达，此时上行处于不同步状态；inactive状态下上行数据(UL data)到达，此时上行处于不同步状态；inactive的状态转换；终端设备请求按需(On-demand)系统消息(System Information，SI)；终端设备发送波束失败恢复请求(Beam Failure Recovery Request)；终端设备请求系统消息(request for other SI)等等。
inactive状态是5G中新引入的状态，该状态介于连接态和空闲态之间。在inactive状态下，终端设备与接入网设备之间没有RRC连接，但保持接入网设备与核心网设备的连接，终端设备保存有建立/恢复连接所必须的全部或部分信息。因而在inactive状态下，终端设备在需要建立连接时，可以根据保存的相关信息，快速地与接入网络设备建立/恢复RRC连接。
图2示出了LTE系统和5G NR系统的竞争随机接入的流程图。
110，随机接入初始化。
随机接入过程由PDCCH命令或MAC子层或RRC子层自身来触发。如果终端设备收到以C-RNTI加扰并且与PDCCH命令(order)一致的PDCCH传输，将触发随机接入过程。PDCCH命令或RRC消息能够指示随机接入过程资源选择时使用的前导码(Preamble)索引RA-Preamble Index(共64种)，以及物理层随机接入信道索引RA-PRACH-Mask Index(共16种)。
其中，前导码索引用于指示随机接入的前导码，当前导码索引取值为000000时，表示随机接入是由MAC子层发起，即前导码由MAC子层自己选取，对应地，执行竞争随机接入。当前导码索引取值不为000000时，UE使用前导码索引指示的前导码进行随机接入，即执行非竞争随机接入。物理层物理接入信道索引RA-PRACH-Mask Index用于指示终端设备可在系统帧内第几个子帧对应的PRACH上发送preamble，终端设备可通过RA-PRACH-Mask Index，查找对应表，确定前导码和可用的物理资源。
随机接入初始化要配置参数，这些参数包括：可用于传输随机接入前导码的PRACH资源集(如，PRACH-Config Index)；可用随机接入前导码分组(A组或B组)及每组中可用的前导码集合；前导码最大传输次数(preamble Trans-Max)；前导码初始发射功率(preamble Initial Received Target power)；功率抬升步长(power Ramping Step)；随机接入响应窗(RA-Response window Size)；第三消息(Msg3)的HARQ最大重传次数(max HARQ-Msg3)；竞争解决定时器(mac-Contention Resolution Timer)。
应注意，在每次随机接入过程触发前，上述配置的参数都可以通过高层配置进行更新。终端设备在获得上述参数后执行以下操作：清空Msg3缓存；将前导码发送的次数(PREAMBLE_TRANSMISSION_COUNTER)设置为1；将终端设备保存的退避(backoff)参数值设置为0ms，并进入随机接入资源选择阶段。
还应注意，终端设备在任一时刻只进行一个随机接入过程。如果在一次随机接入过程中，终端设备收到新发起的随机接入请求，由终端设备侧的实现来决定继续正在进行的随机接入过程或启动新的随机接入过程。
120，终端设备向网络设备发送随机接入前导码(Preamble)。
具体的，RAP承载于第一消息(Msg1)中。RAP的主要作用是告诉网络设备有一个随机接入请求，并使得网络设备能估计其与终端设备之间的传输时延，以便接入网设备可 以校准上行的提前量(uplink timing)并将校准信息通过定时提前命令(Timing Advance command)告知终端设备。
随着5G NR系统中引入新的随机接入场景，随机接入还可以用于新场景中终端设备的其他请求。例如，RAP还可以用于指示发送按需系统消息请求，或者用于指示发送波束失败恢复请求等等，本申请对此不作限定。
例如，RAP可以与一个或多个on-demand SI请求具有对应关系，或者RAP可以与一个或多个波束失败恢复请求之间具有对应关系。终端设备可以预配置该RAP，或者接收接入网设备配置的该RAP。
130，终端设备接收网络设备发送的随机接入响应(random access response，RAR)。
具体的，终端设备可以利用随机接入无线网络临时标识(random access radio network temporary identifier，RA-RNTI)监听PDCCH，若接收到属于自己的调度信息，即下行控制信息(downlink control information，DCI)，终端设备根据DCI信息在PDSCH上接收来自网络设备下发的RAR消息。DCI信息包括诸如资源块(Resource Block,RB)分配信息、调制编码方式(Modulation and Coding Scheme，MCS)等相关内容。
具体的，随机接入响应承载于第二消息(Msg2)中。在终端设备发送了preamble后，会在RAR响应窗口内根据preamble对应的RA-RNTI值来监听对应的PDCCH。如果终端设备接收的响应中携带的Preamble与Msg1发送的Preamble一致，则停止监听RAR。具体而言，网络设备可以通过PDSCH向终端设备发送RAR。
RAR中包含上行定时提前量、为第三消息(Msg3)分配的上行授权(UL grant)、网络侧分配的临时小区无线网络临时标识(cell radio network temporary identifier,temporary C-RNTI)等。承载Msg2调度消息的PDCCH用RA-RNTI加扰。
值得一提的是，如果多个终端设备在同一PRACH资源(时频位置相同)发送RAP，则对应的多个RAR复用在同一媒体接入控制(medium access control，MAC)协议数据单元(protocol data unit，PDU)中。
140，终端设备向网络设备发送基于调度传输(scheduled transmission)的消息(即Msg3)。
终端设备根据Msg2中的上行授权和上行定时提前量信息，通过PUSCH向网络设备发送Msg3。这里，根据终端设备状态的不同和应用场景的不同，Msg3的内容也可能不同。
由于130中网络设备是将MAC PDU发送给多个终端设备的，因而每个终端设备接收到的RAR可以不同，相应地，每个终端设备的行为也可能不同。每个终端设备在监听到属于自己的RAR后，可以根据RAR中包含的具体内容向接入网设备发送Msg3。
Msg3可以分为以下几种：RRC连接请求、追踪区域数据更新、资源调度请求等等。表1中给出了Msg3一些示例。
表1：
Figure PCTCN2020098394-appb-000001
Figure PCTCN2020098394-appb-000002
150，终端设备接收网络设备发送的竞争解决，即第四消息Msg4。
当多个终端设备使用相同的前导码发起随机接入时，就会发生竞争。竞争相同资源的终端设备中最多只有一个终端设备能够接入成功。此时网络设备通过PDSCH向终端设备发送竞争解决消息。
具体的，终端设备在发送完Msg3后，开启竞争解决定时器(mac-Contention Resolution Timer)，并利用RAR中指示的Temporary C-RNTI或者网络设备预先配置的C-RNTI来监听PDCCH，若在竞争解决定时器超时前，终端设备接收到来自网络设备发给自己的竞争解决消息，则认为随机接入过程成功。
2、两步随机接入
对于竞争随机接入，为了缩短随机接入时延，5G NR系统除了支持目前传统的四步随机接入方法外，还支持两步随机接入。两步随机接入作为当前5G NR系统随机接入的一个研究热点，图3示出了5G NR系统的两步随机接入的流程图。
210，终端设备向网络设备发送消息A(MsgA)。
具体地，该MsgA包括随机接入信号和载荷数据，随机接入信号可以包括前导码Preamble和/或解调参考信号(demodulation reference signal,DMRS)，该随机接入信号用于载荷数据的接收，例如，可以根据该随机接入信号确定载荷数据的传输边界(比如传输载荷数据的时隙(slot)的起始位置和结束位置)或解调。该载荷数据可以为控制面数据和/或用户面数据，该载荷数据可以对应于前述四步随机接入机制中Msg3中包含的内容。例如，该载荷数据可以包括RRC连接请求、终端设备的标识、调度请求、缓存状态报告(buffer status report,BSR)和真实的业务数据等中的任意一种。
可选地，终端设备的标识可以为C-RNTI、临时移动用户标识(serving-temporary mobile subscriber identity,s-TMSI)、非激活状态下终端的标识(resumeIdentity)等等。具体携带什么标识，取决于不同的随机接入触发事件，不做限定。需说明的是，该终端设备的标识可以全部携带于载荷数据中，或者可以部分携带于载荷数据中，部分携带于随机接入信号中。其中，携带于随机接入信号中，可以理解为，不同的序列或相同的序列但是不同的循环移位，来表示不同的比特值。表2给出了不同的随机接入触发事件对应的终端设备的标识。
表2：
随机接入触发事件 UE标识的类型
初始接入 NAS终端设备ID(S-TMSI)或随机数
RRC连接重建立 C-RNTI
切换 C-RNTI
上/下行数据到达，上行失步 C-RNTI
inactive的状态转换 ShortI-RNTI或I-RNTI
请求系统信息 无
波束失败恢复 C-RNTI
网络设备接收到MsgA之后，对随机接入信号和载荷数据进行解码，得到解码情况包 括：(1)“成功解码”；(2)“未成功解码”。表3示出了可能出现的解码结果。
表3：
  随机接入信号 载荷数据
情况1 未成功解码 未成功解码
情况2 未成功解码 成功解码
情况3 成功解码 未成功解码
情况4 成功解码 成功解码
进一步地，随机接入信号所在的资源与载荷数据所在的资源的可能关系如下：1)在时域上存在重叠区域，在频域上没有重叠区域；2)在时域上没有重叠区域，在频域上可以存在重叠区域，也可以不存在重叠区域。随机接入信号所在的资源和载荷数据所在的资源可以是由网络设备配置的。
220，网络设备向终端设备发送消息B(MsgB)。
具体地，MsgB用于承载针对该随机接入信号和载荷数据的响应消息。该响应消息可以至少包括以下之一：临时C-RNTI的信息、定时提前命令(TA command)的信息、上行授权的信息、竞争解决标识(contention resolution ID)信息等。其中，竞争解决标识可以为载荷数据的部分或者全部内容。
此外，响应消息还包括控制面消息(也可以看作基于调度传输的应答消息)，例如，根据终端设备状态的不同和触发场景的不同，RAR还可以包括以下之一：RRC连接(RRCSetup)消息、RRC重建立(RRCReestablishment)消息、RRC恢复(RRCResume)消息等。
其中，本申请所述的响应消息是指对请求随机接入的响应消息，也可以称为随机接入响应(消息)。
3、媒体接入控制协议数据单元(MAC PDU)
第三代合作伙伴计划(The 3rd generation partnership project,3GPP)在LTE协议中定义的层2(L2)协议栈从上到下包括PDCP层、RLC层和MAC层三个逻辑层次，在NR协议中定义的层2(L2)协议栈从上到下包括服务数据适应层(Service Data Adaptation Protocol，SDAP)层、PDCP层、RLC层和MAC层四个逻辑层次。其中，SDAP层完成服务质量(Quality of service，QoS)流到无线承载的映射；PDCP层完成用户面和控制面的数据传输、加密、完整性保护和头压缩等功能；RLC层完成数据包的大小匹配等功能；MAC层完成数据调度以及逻辑信道与传输信道之间的映射等功能。整个L2下行协议栈处理流程是:PDCP层数据加上PDCP的头组成PDCP协议数据单元发送给RLC层，RLC层完成一定的功能后，将接收到的数据加上RLC头发送给MAC层，MAC层复用一个或多个MAC业务数据单元(service data unit,SDU)组成MAC PDU发送给终端设备。图4示出了LTE的层2协议栈的结构示意图。
图5示出了MAC PDU的一例的示意性结构图。如图5所示，一个MAC PDU可以包括多个MAC子PDU(subPDU)。MAC子PDU可以包括MAC SDU、MAC控制元素(medium access control control elements,MAC CE)和补充(Padding)数据中的任意一种。Padding数据就是填充的数据，当RLC层数据量小于实际调度的资源时，MAC需要在MAC PDU最后面打填充，即填充Padding数据，根据具体情况，MAC PDU可以包括Padding数据， 也可以不包括Padding数据。
MAC子PDU可以包括MAC子头(subheader)，也可以不包括MAC子头。
图6示出了MAC子头的一例的示意性结构图。该MAC子头可以对应于图5中MAC子PDU 2和MAC子PDU n的子头。在图6中，该MAC子头包括一个预留比特域R，还包括格式域F、逻辑信道标识域LCID(logical channel ID field)、长度域L，其中，逻辑信道标识域LCID通常占6个比特，格式域F占1个比特，格式域F用于指示长度域L的长度，例如，格式域F的值为0时，表示长度域L的长度为8个比特，而格式域F的值为1时，表示长度域L的长度为16个比特。长度域L用于指示所在的MAC子PDU的大小。
应理解，上文对四步随机接入、两步随机接入和MAC PDU的相关介绍只是为了便于理解本申请的技术方案，而不对本申请构成任何限定。
目前，两步随机接入机制中响应消息的格式问题还没有被明确，造成两步随机接入机制不完整，无法保证网络通信的可靠性。
本申请实施例提供一种随机接入的方法，同时提供了两种随机接入响应的消息格式，网络设备能够根据具体情况选择使用任意一种消息格式向终端设备发送随机接入响应，使得随机接入响应更加灵活、高效，能够满足不同的使用需求。
下面结合附图介绍本申请实施例提供的随机接入的方法，实施例中的网络设备可以是图1中的网络设备11，终端设备可以是图1中的终端设备12。
图7是本申请两步随机接入的方法300的示意性流程图。以下，结合图7阐述本申请实施例提供的随机接入的方法300，该方法300包括：
步骤310，网络设备确定响应消息的消息格式，该消息格式包括第一格式或者第二格式，其中，第一格式的响应消息，包括竞争解决标识和控制面消息；
第二格式的响应消息，包括竞争解决标识，且不包括控制面消息。
示例的，第一格式又可以称为Format 1B，第二格式又可以称为Format 1A，或者，第一格式又可以称为Format 1A，第二格式又可以称为Format 1B，本申请对第一格式或者第二格式的具体名称不做限制。步骤320，网络设备使用确定的消息格式向终端设备发送响应消息。
相应地，在步骤320中，终端设备接收网络设备发送的响应消息。
具体地，网络设备首先接收终端设备发送的随机接入请求消息(即对应前文两步随机接入中的消息A(MsgA))，该随机接入请求消息包括随机接入信号和载荷数据，该随机接入信号可以是前导码Preamble和/或DMRS，根据随机接入触发场景的不同，该载荷数据包括的内容可以不同，例如，该第一数据可以包括RRC连接请求、终端设备的标识、调度请求、缓存状态报告和真实的业务数据等中的任意一部分。
在本实施例中，随机接入触发场景可以为初始接入、RRC连接重建立、inactive态的状态转换、请求系统消息等中的任意一种。
可选地，载荷数据可以包括初始接入场景的RRC连接建立请求消息、RRC连接重建立场景的RRC重建立请求消息、inactive态的状态转换场景的RRC恢复请求消息等任意一种。
进一步地，网络设备接收到该随机接入请求消息之后，需要对其所包含的随机接入信号和载荷数据进行解码。在本实施例中，网络设备对随机接入信号和载荷数据进行解码的 结果可以是前文表3中的情况2和情况4，也就是说，网络设备应当对载荷数据成功进行解码，而对随机接入信号的解码结果可以不做要求。
网络设备在接收到随机接入请求消息，并且对载荷数据进行成功解码以后，可以根据载荷数据中的内容生成相应的响应信息，在本实施例中，该响应信息可以包括竞争解决标识，以及，可选地，还可以包括控制面消息，网络设备通过第一格式或者第二格式向终端设备发送响应消息。
其中，该竞争解决标识可以为载荷数据的部分内容或者全部内容，例如，竞争解决标识可以是基于调度传输的消息中的某一部分相连的字符串，本申请对此并不限定。
终端设备在接收到并且解析了该响应消息以后，将该竞争解决标识与发送的载荷数据中的相应内容进行匹配，如果二者匹配成功(例如二者内容相同)，则可以确定该响应消息为属于该终端的响应，此时可以停止监听响应消息。
可选地，根据随机接入触发场景的不同，控制面消息可以包括以下消息中的任意一种：初始接入场景的RRC连接建立、RRC连接重建立场景的RRC重建立、inactive态的状态转换场景的RRC恢复。
在第一格式的响应消息中，包括竞争解决标识和控制面消息。而在第二格式的响应消息中，包括竞争解决标识但是不包括该控制面消息(该控制面消息可以在其他的消息中发送)。网络设备可以根据具体情况确定选择哪种消息格式发送响应消息。例如，为了使终端设备尽快接收到该控制面消息，可以使用第一格式向终端设备发送响应消息。再例如，为了能够使尽量多的终端设备的响应消息复用在一起(此时一个终端设备所占用的比特数不宜过多)，从而能够提高无线资源利用率，网络设备可以使用第二格式向终端设备发送响应消息。
本申请实施例提供的随机接入的方法，同时也提供了两种随机接入响应的消息格式，并且网络设备能够根据具体情况选择使用任意一种消息格式向终端设备发送随机接入响应，使得随机接入响应更加灵活、高效，能够满足不同的使用需求。
可选地，作为一种可能的实施方式，在步骤310中，网络设备还可以根据终端设备的指示来确定选择哪种消息格式发送响应消息。
例如，网络设备可以根据终端设备的指示，确定使用第一格式或者第二格式来发送响应消息。
终端设备可以通过显性或者隐性的方式对响应消息的消息格式进行指示，网络设备可以根据该指示确定使用的消息格式。终端设备可以通过以下两种方式中的任意一种对响应消息的消息格式进行指示。
方式A
在步骤310之前，方法300还包括：
终端设备向网络设备发送响应消息的消息格式请求信息，该消息格式请求信息用于指示网络设备发送响应消息所使用的消息格式。
相应地，网络设备接收终端设备发送的消息格式请求信息，并且根据该消息格式请求信息确定发送响应消息所使用的消息格式。
可选地，该消息格式请求信息可以携带于上行控制信息(uplink control information,UCI)中。
可选地，该消息格式请求信息可以携带于随机接入请求消息(即消息A)中。
方式B
系统或者协议可以规定，或者也可以由网络设备和终端设备之间进行约定，终端设备可以按照以下规则发送随机接入请求消息：
当终端设备确定请求的响应消息的消息格式为第一格式时，终端设备在第一随机接入资源上发送随机接入请求信息；
当终端设备确定请求的响应消息的消息格式为第二格式时，终端设备在第二随机接入资源上发送随机接入请求信息。
相应的，网络设备可以根据对该随机接入请求信息的接收情况确定响应消息的消息格式。
例如，如果在第一随机接入资源上接收到随机接入请求信息，则网络设备可以确定随机接入响应的消息格式为第一格式。
再例如，如果在第二随机接入资源上接收到随机接入请求信息，则网络设备可以确定随机接入响应的消息格式为第二格式。
该第一随机接入资源和第二随机接入资源可以为系统或者协议规定，也可以由网络设备和终端设备之间进行约定。
应理解，本申请实施例中的“协议”可以是指通信领域的标准协议，例如可以包括LTE协议、NR协议以及应用于未来的通信系统中的相关协议，本申请对此不做限定。可选地，不同消息格式的响应消息对应的随机接入配置(例如响应窗口长度)可以不相同，终端设备可以根据不同的随机接入配置接收不同消息格式的响应消息。
可选地，终端设备可以根据第一随机接入配置接收第一格式的响应消息，例如，终端设备可以在第一响应窗口长度内接收第一格式的响应消息。
可选地，终端设备可以根据第二随机接入配置接收第二格式的响应消息，例如，终端设备可以在第二响应窗口长度内接收第二格式的响应消息。
可选地，如果网络设备根据终端设备的指示来确定选择哪种消息格式发送响应消息，则在步骤320中，终端设备可以根据指示的内容选择相应的随机接入配置来接收响应消息。
例如，终端设备指示网络设备选择的响应消息的消息格式为第一格式时，则终端设备可以根据与第一格式相对应的第一随机接入配置来接收第一格式的响应消息。
再例如，终端设备指示网络设备选择的响应消息的消息格式为第二格式时，则终端设备可以根据与第二格式相对应的第二随机接入配置来接收第二格式的响应消息。
可选地，该响应消息还可以包括定时提前量命令、临时小区无线网络临时标识C-RNTI、上行授权中的至少一种，也就是说，第一格式的响应消息或者第二格式的响应消息还可以包括定时提前量命令、临时C-RNTI、上行授权中的至少一种。需说明的是，上行授权可以用于传输针对响应信息的反馈(例如HARQ反馈)，可以是PUCCH资源或PUSCH资源。
可选地，第二格式的响应消息包括N个终端设备对应的N个竞争解决标识，N为大于或者等于2的整数，从而能够使多个终端设备的响应消息复用在一起，提高无线资源的利用率。
可选地，作为一种替换方式，第二格式的响应消息可以不包括竞争解决标识，而包括N个终端设备各自对应的以下信息中的至少一种：定时提前量命令、临时小区无线网络临时标识C-RNTI、上行授权，本申请对此并不限定。
可选地，第二格式的响应消息不包括该N个终端设备中任意一个终端设备对应的控制面消息，例如，第二格式的响应消息仅包括N个终端的竞争解决标识，而不包括控制面消息，从而能够使尽量多的终端设备的响应消息复用在一起，提高无线资源利用率。或者，第二格式的响应消息不仅包括竞争解决标识，还包括N个终端设备各自对应的以下信息中的至少一种：定时提前量命令、临时小区无线网络临时标识C-RNTI、上行授权等，本申请对此并不限定。可选地，第一格式的响应消息或者第二格式的响应消息携带于媒体接入控制MAC协议数据单元PDU中。
例如，针对第一格式的响应消息，可以将竞争解决标识和控制面消息同时携带于该MAC PDU中，而针对第二格式的响应消息，可以将竞争解决标识携带于该MAC PDU中。
图8示出了第一格式的响应消息携带于MAC PDU中的一例的示意图。
如图8所示，MAC PDU至少包括第一MAC子PDU和第二MAC子PDU，第一格式的响应消息的竞争解决标识携带于第一MAC子PDU中，第一格式的响应消息的控制面消息携带于所述第二MAC子PDU中。
图9示出了竞争解决标识携带于第一MAC子PDU中的结构示意图，图10示出了控制面消息携带于第二MAC子PDU中的结构示意图。
在图9中，字节1(对应于图中所示的oct 1)用于承载第一MAC子PDU的MAC子头，字节2-7(oct 2-7)用于承载竞争解决标识。在图10中，字节1(oct 1)和字节2(oct2)用于承载第二MAC子PDU的MAC子头。
可选地，图8中的其他MAC子PDU(例如，第三MAC子PDU、第四MAC子PDU)可以携带终端设备的其他通信数据，本申请对此并不限定。
可选地，第一格式的响应消息的竞争解决标识和控制面消息也可以均携带于同一个MAC子PDU中。
可选地，第一格式的响应消息的竞争解决标识和控制面消息也可以携带于3个或者3个以上的MAC子PDU中，本申请对此并不限定。
参见前文的表述，第一格式的响应消息中还可能包括定时提前量命令、临时C-RNTI、上行授权等其他内容，上述其他内容可以和竞争解决标识携带于同一个MAC子PDU(即第一MAC子PDU)中。图11-图16示出了第一MAC子PDU还携带有上述其他内容的结构示意图。
图11示出了第一MAC子PDU的另一例的示意图。在图11中，除了竞争解决标识以外，第一MAC子PDU中还携带有定时提前量命令、上行授权、临时C-RNTI。
图12示出了第一MAC子PDU的再一例的示意图。在图12中，除了竞争解决标识以外，第一MAC子PDU中还携带有定时提前量命令、临时C-RNTI。
图13示出了第一MAC子PDU的再一例的示意图。在图13中，除了竞争解决标识以外，第一MAC子PDU中还携带有定时提前量命令。
图14示出了第一MAC子PDU的再一例的示意图。在图14中，除了竞争解决标识以外，第一MAC子PDU中还携带有临时C-RNTI。
图15示出了第一MAC子PDU的再一例的示意图。在图15中，除了竞争解决标识以外，第一MAC子PDU中还携带有上行授权。
图16示出了第二格式的响应消息携带于MAC PDU中的一例的示意图。
具体地，在图16中，MAC PDU包括S个MAC子PDU，S大于或者等于N，N个竞争解决标识分别携带于N个MAC子PDU中，例如，终端设备1、2、3、N的竞争解决标识可以分别携带于第一、二、三、N MAC子PDU中。这样可以使多个终端设备的响应消息复用同一个MAC PDU，可以提高无线资源的利用率。
其中，第一、二、三、N MAC子PDU携带终端设备1、2、3、N的竞争解决标识以后的结构示意图可以参考图9中第一MAC子PDU的结构示意图。
可选地，该MAC PDU中不包括该N个终端设备中任意一个终端设备对应的控制面消息，从而可以是更多的终端设备的响应消息复用到该MAC PDU，或者说，从而可以使该MAC PDU的尺寸不会太大。
可选地，在其他实施方式中，该N个竞争解决标识也可以携带于大于或者小于N个MAC子PDU中，例如，可以多个竞争解决标识复用到一个MAC子PDU，或者，一个竞争解决标识携带于一个或者多个MAC子PDU中，本申请对此并不限定。
类似地，针对每个终端设备，其响应消息还可能包括定时提前量命令、临时C-RNTI、上行授权等其他内容，因此每个终端设备对应的上述其他内容可以和自身的竞争解决标识携带于同一个MAC子PDU(即第一MAC子PDU)中。
也就是说，上述第一、二、三、N MAC子PDU中还可以分别对应携带终端设备1、2、3、N的其他内容。上述第一、二、三、N MAC子PDU携带其他内容的结构可以参考图11-图16，对应的结构描述也可以参考前文的相关表述，本申请在此不再赘述。
步骤330，终端设备确定响应消息的消息格式。
步骤340，终端设备根据确定的响应消息的消息格式对响应消息进行解析。
具体地，网络设备具体选用哪种消息格式发送响应消息终端设备可能并不知晓(即此时终端设备并未指示网络设备使用哪种消息格式发送响应消息)，因此，终端设备在对响应消息进行解析之前，首先需要确定响应消息的消息格式。网络设备可以通过显性或者隐性的方式对响应消息的消息格式进行指示，终端设备可以根据该指示确定使用的消息格式。网络设备可以通过以下三种方式中的任意一种对响应消息的消息格式进行指示。
方式一
可选地，方法300还包括：
步骤321，网络设备向终端设备发送指示信息，该指示信息用于指示响应消息的消息格式。
相应地，在步骤321中，终端设备接收该指示信息。
相应地，在步骤330中，终端设备通过该指示信息确定响应消息的消息格式。
具体地，可以通过显性指示的方式向终端设备进行指示，终端设备根据指示信息确定响应消息的消息格式。例如，该指示信息用于指示是否存在控制面消息，或，该指示信息用于指示单播MAC PDU(例如对应于第一格式的响应消息)或组播MAC PDU(例如对应于第二格式的响应消息)。当指示信息指示存在控制面消息，即指示信息指示响应消息的消息格式为第一格式时，那么终端设备根据控制面消息对应的响应消息的消息格式(即 第一格式)对响应消息进行解析。
可选地，该指示信息可以携带于MAC PDU中。例如，可以携带于MAC PDU中的MAC子PDU中，或MAC子头中。
可选地，该指示信息可以携带于MAC子头中的预留比特域中，例如，可以通过预留比特域的一个比特位是0还是1来指示响应消息的消息格式为第一格式还是第二格式。
可选地，该指示信息也可以携带于MAC子PDU中的类型指示域中，通过类型指示域指示该MAC子PDU是固定长度还是可变长度来间接指示响应消息的消息格式为第一格式还是第二格式。
可选地，该指示信息也可以携带于MAC子PDU中。例如，该MAC子PDU可以为专用的MAC子PDU(例如图8中的第三MAC子PDU，或者图16中的第S MAC子PDU)，专门用于携带该指示信息。
可选地，该指示信息也可以携带于响应消息所对应的DCI中。该DCI用于分配下行资源，该下行资源用于传输响应消息。
方式二
系统或者协议可以规定，或者也可以由网络设备和终端设备之间进行约定，在步骤320中，可以按照以下规则发送响应消息：
当网络设备确定的响应消息的消息格式为第一格式时，网络设备使用第一无线网络临时标识RNTI发送第一格式的响应消息；
当网络设备确定的响应消息的消息格式为第二格式时，网络设备使用第二RNTI发送第二格式的响应消息。
相应的，在步骤320中，终端设备可以按照以下规则接收响应消息：
终端设备使用第一无线网络临时标识RNTI和第二RNTI接收所述响应消息。
相应地，在步骤320中，终端设备根据对响应消息的接收情况确定响应消息的消息格式。
应理解，网络设备使用第一RNTI发送第一格式的响应消息，具体可以是使用第一RNTI加扰第一格式的响应消息所对应的DCI的循环冗余校验(cyclic redundancy check,CRC)，该DCI用于分配PDSCH资源，该PDSCH资源用于承载该第一格式的响应消息。
同样的，网络设备使用第二RNTI发送第二格式的响应消息，具体可以是使用第二RNTI加扰第二格式的响应消息所对应的DCI的CRC，该DCI用于分配PDSCH资源，该PDSCH资源用于承载该第二格式的响应消息。
相应地，终端设备使用第一RNTI和第二RNTI接收响应消息，具体可以是使用第一RNTI和第二RNTI解扰响应消息所对应的DCI的CRC。
网络设备接收到随机接入请求消息之后，可以根据该随机接入请求消息(例如，前导码Preamble所在的时频位置)按照预设的规则生成RNTI，该RNTI用于发送响应消息，相应地，终端设备也按照相同的规则生成该RNTI，并且使用该RNTI接收该随机接入响应。
在本申请中，可以分别给网络设备和终端设备配置两套不同的RNTI规则，即第一RNTI规则和第二RNTI规则，针对同一个随机接入请求消息，该第一RNTI规则和第二RNTI规则可以分别生成第一RNTI和第二RNTI，该第一RNTI和第二RNTI分别对应第 一格式的响应消息和第二格式的响应消息，并且该第一RNTI和第二RNTI不相同。
网络设备根据确定的消息格式选择对应的RNTI规则来生成RNTI，并且通过该RNTI发送响应消息。
终端设备同时使用第一RNTI和第二RNTI接收响应消息，并且根据对响应消息的接收情况确定响应消息的消息格式。
例如，如果使用第一RNTI成功的接收到该随机接入响应，则终端设备可以确定该随机接入响应为第一格式的随机接入响应，即消息格式为第一格式。
再例如，如果使用第二RNTI成功的接收到该随机接入响应，则终端设备可以确定该随机接入响应为第二格式的随机接入响应，即消息格式为第二格式。
应理解，本申请实施例中的“协议”可以是指通信领域的标准协议，例如可以包括LTE协议、NR协议以及应用于未来的通信系统中的相关协议，本申请对此不做限定。
方式三
系统或者协议可以规定，或者也可以由网络设备和终端设备之间进行约定，在步骤320中，网络设备可以按照以下规则发送响应消息：
当网络设备确定的响应消息的消息格式为第一格式时，网络设备在第一资源集合上发送第一格式的响应消息所对应的DCI；
当网络设备确定的响应消息的消息格式为第二格式时，网络设备在第二资源集合上发送第二格式的响应消息所对应的DCI。
相应的，在步骤320中，终端设备可以按照以下规则监听响应消息对应的DCI：
终端设备在第一资源集合和第二资源集合上监听响应消息对应的DCI。
相应地，在步骤320中，终端设备根据对响应消息对应的DCI的监听情况确定响应消息的消息格式。
在本申请中，可以分别给网络设备和终端设备配置两套不同的资源集合，即第一资源集合和第二资源集合，该第一资源集合与第一格式的响应消息相对应，可以通过第一资源集合发送第一格式的响应消息所对应的DCI，该第二资源集合与第二格式的响应消息相对应，可以通过第二资源集合发送第二格式的响应消息所对应的DCI，该第一资源集合和第二资源集合不重叠。
可选地，该第一资源集合可以包括控制信道资源集合(CORESET)和/或搜索空间(searching space)。
可选地，该第二资源集合可以包括控制信道资源集合和/或搜索空间。
网络设备根据确定的消息格式选择对应的资源集合来发送响应消息对应的DCI。
终端设备同时在第一资源集合和第二资源结合接收响应消息对应的DCI，并且根据对响应消息对应的DCI的接收情况确定响应消息的消息格式。
例如，如果在第一资源集合上成功的监听到该随机接入响应对应的DCI，则终端设备可以确定该随机接入响应为第一格式的随机接入响应，即消息格式为第一格式。
再例如，如果在第二资源集合上成功的监听到该随机接入响应对应的DCI，则终端设备可以确定该随机接入响应为第二格式的随机接入响应，即消息格式为第二格式。
该第一资源集合和第二资源集合可以为系统或者协议规定，也可以由网络设备和终端设备之间进行约定。例如，网络设备可以通过半静态信令或者动态信令对终端设备进行配 置。其中，半静态信令例如可以是RRC信令。动态信令例如可以是MAC CE或者DCI。
应理解，本申请实施例中的“协议”可以是指通信领域的标准协议，例如可以包括LTE协议、NR协议以及应用于未来的通信系统中的相关协议，本申请对此不做限定。
在步骤340，终端设备根据确定的响应消息的消息格式对响应消息进行解析。
具体地，终端设备在确定了响应消息的消息格式以后，可以按照预定的规则获知响应消息中各个比特的具体含义，可以按照对应的方式对响应消息进行解析，从而获知响应消息的消息内容。
例如，当终端设备确定响应消息的消息格式为第一格式，则按照第一格式对响应消息进行解析。
再例如，当终端设备确定响应消息的消息格式为第二格式，则按照第二格式对响应消息进行解析。
本申请实施例提供了两种响应消息的消息格式，并且网络设备能够根据具体情况选择使用任意一种消息格式向终端设备发送响应消息。例如，为了使终端设备尽快接收到控制面消息，可以使用第一格式向终端设备发送响应消息。再例如，为了能够使尽量多的终端设备的响应消息复用到一起，从而能够提高无线资源利用率，网络设备可以使用第二格式向终端设备发送响应消息。通过以上设置，使得随机接入响应更加灵活、高效，能够满足不同的使用需求。
图17是本申请两步随机接入的方法400的示意性流程图。以下，结合图17阐述本申请实施例提供的随机接入的方法400，该方法400包括：
步骤410，网络设备在PDSCH资源上向终端设备发送第一消息，该第一消息携带有上行授权信息。
具体地，网络设备首先接收终端设备发送的随机接入请求消息(即对应前文两步随机接入中的MsgA)，该随机接入请求消息包括随机接入信号和载荷数据，该随机接入信号可以是前导码Preamble和/或DMRS，根据随机接入触发场景的不同，该载荷数据包括的内容可以不同。例如，该载荷数据可以包括C-RNTI。在本实施例中，随机接入触发场景可以为切换、上行数据到达且上行失步、下行数据到达且上行失步、波束失败恢复等中的任意一种。
进一步地，网络设备接收到该随机接入请求消息之后，需要对其所包含的随机接入信号和载荷数据进行解码。在本实施例中，网络设备对随机接入信号和载荷数据进行解码的结果可以是前文表3中的情况2和情况4，也就是说，网络设备应当对载荷数据成功进行解码，而对随机接入信号的解码结果可以不做要求。
网络设备在接收到随机接入请求消息，并且对载荷数据进行成功解码以后，可以根据载荷数据中的内容生成相应的响应信息，在本实施例中，该响应信息至少包括上行授权信息。
在本实施例中，网络设备可以在PDSCH资源上向终端设备发送第一消息，该第一消息中携带有上行授权信息，而无需在PDCCH资源上发送该第一信息，从而使得终端设备可以尽快的接收到该第一消息，终端设备能够尽快的向网络设备发送新传数据或者进行重传。
可选地，在步骤410中，网络设备可以通过C-RNTI在PDSCH资源上向终端设备发 送第一消息。
具体地，网络设备可以通过C-RNTI加扰PDCCH，对应的DCI的CRC通过C-RNTI加扰，所述DCI分配PDSCH资源，在所述PDSCH资源上发送该第一消息。
可选地，终端设备在接收到该第一消息之后，所述方法还包括：
终端设备向网络设备发送新传数据。
可选地，终端设备在接收到该第一消息之后，所述方法还包括：
终端设备向网络设备进行重传。
可选地，第一消息还包括传输指示信息，该传输指示信息用于指示终端设备发送新传数据或者重传。
可选地，当终端设备确定为新传，则终端设备生成MAC PDU，并递交给HARQ实体，进行HARQ传输。
上文结合图1至图17详细描述了本申请实施例的响应消息的方法，下面结合图18至图21，详细描述本申请实施例的装置。应理解，图18至图21所示的装置能够实现图7、17所示的方法流程中的一个或者多个的步骤。为避免重复，在此不再详细赘述。
图18是本申请实施例的通信设备的示意图，图18所示的通信装置500包括：确定单元510和发送单元520。
确定单元510，用于确定响应消息的消息格式，该消息格式包括第一格式或第二格式，其中，第一格式的响应消息，包括竞争解决标识和控制面消息；第二格式的响应消息，包括竞争解决标识，且不包括控制面消息；
发送单元520，用于使用确定的响应消息的消息格式向终端设备发送所述响应消息。
可选地，第一格式的响应消息或者第二格式的响应消息携带于媒体接入控制MAC协议数据单元PDU中。
可选地，该MAC PDU包括第一MAC子PDU和第二MAC子PDU，第一格式的响应消息的竞争解决标识携带于第一MAC子PDU中，第一格式的响应消息的所述控制面消息携带于第二MAC子PDU中。
可选地，第二格式的响应消息包括N个所述终端设备对应的N个竞争解决标识，该N个竞争解决标识携带于该MAC PDU中，N为大于或者等于2的整数。
可选地，该MAC PDU包括S个MAC子PDU，S大于或者等于N，该N个竞争解决标识分别携带于N个MAC子PDU中。
可选地，发送单元520还用于向所述终端设备发送指示信息，指示信息用于指示响应消息的消息格式。
可选地，当确定单元510确定的响应消息的消息格式为第一格式时，发送单元520使用第一无线网络临时标识RNTI发送第一格式的响应消息；当确定单元510确定的响应消息的消息格式为第二格式时，发送单元520使用第二RNTI发送所述第二格式的响应消息。
可选地，当确定单元510确定的响应消息的消息格式为第一格式时，发送单元520在第一资源集合上发送所述第一格式的响应消息所对应的下行控制信息DCI；当确定单元510确定的响应消息的消息格式为第二格式时，发送单元520在第二资源集合上发送所述第二格式的响应消息所对应的DCI。
可选地，第一资源集合包括控制信道资源集合和/或搜索空间，第二资源集合包括控 制信道资源集合和/或搜索空间。
可选地，指示信息携带于该MAC PDU中，或者，指示信息携带于响应消息所对应的DCI中。
可选地，第一格式的响应消息或第二格式的响应消息中还包括以下信息中的至少一种：定时提前量命令、临时小区无线网络临时标识C-RNTI、上行授权。
可选地，控制面消息包括以下消息中的任意一种：无线资源控制RRC连接建立、RRC恢复、RRC重建立。
在一种可能的实现方式中，上述通信装置500可以为网络设备，例如下文中的基站80，其中处理单元的功能可以由基站中的处理器8022实现，收发单元的功能可以通过基站80的RRU 801实现。下文结合图19介绍本申请实施例的网络设备的结构。
图19是本申请实施例的一种网络设备的结构示意图，如可以为基站的结构示意图。如图19所示，该基站可应用于如图1所示的系统中，执行上述方法实施例中网络设备的功能。基站80可包括一个或多个射频单元，如远端射频单元(remote radio unit，RRU)801和一个或多个基带单元(baseband unit，BBU)(也可称为数字单元，digital unit，DU)802。所述RRU 801可以称为收发单元、收发机、收发电路、或者收发器等等，其可以包括至少一个天线8011和射频单元8012。所述RRU 801部分主要用于射频信号的收发以及射频信号与基带信号的转换，例如用于向终端设备发送上述实施例中所述的信令消息。所述BBU 802部分主要用于进行基带处理，对基站进行控制等。所述RRU 801与BBU 802可以是物理上设置在一起，也可以物理上分离设置的，即分布式基站。
所述BBU 802为基站的控制中心，也可以称为处理单元，主要用于完成基带处理功能，如信道编码，复用，调制，扩频等等。例如所述BBU(处理单元)802可以用于控制基站执行上述方法实施例中关于网络设备的操作流程。
在一个实例中，所述BBU 802可以由一个或多个单板构成，多个单板可以共同支持单一接入指示的无线接入网(如LTE网)，也可以分别支持不同接入制式的无线接入网(如LTE网，5G网或其他网)。所述BBU 802还包括存储器8021和处理器8022，所述存储器8021用于存储必要的指令和数据。例如存储器8021存储上述实施例中的码本索引与预编码矩阵的对应关系。所述处理器8022用于控制基站进行必要的动作，例如用于控制基站执行上述方法实施例中关于网络设备的操作流程。所述存储器8021和处理器8022可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板共用相同的存储器和处理器。此外每个单板上还可以设置有必要的电路。
图20是本申请另一实施例的通信设备的示意图，图20所示的通信装置600包括：接收单元610、确定单元620和解析单元630。
接收单元610，用于接收网络设备发送的响应消息；
确定单元620，用于确定响应消息的消息格式，该消息格式包括第一格式或者第二格式，其中，第一格式的响应消息，包括竞争解决标识和控制面消息；第二格式的响应消息，包括竞争解决标识，且不包括控制面消息；
解析单元630，用于根据确定的响应消息的消息格式对所述响应消息进行解析。
可选地，第一格式的响应消息或者第二格式的响应消息携带于媒体接入控制MAC协议数据单元PDU中。
可选地，该MAC PDU包括第一MAC子PDU和第二MAC子PDU，第一格式的响应消息的竞争解决标识携带于第一MAC子PDU中，第一格式的响应消息的所述控制面消息携带于第二MAC子PDU中。
可选地，第二格式的响应消息包括N个所述终端设备对应的N个竞争解决标识，该N个竞争解决标识携带于该MAC PDU中，N为大于或者等于2的整数。
可选地，该MAC PDU包括S个MAC子PDU，S大于或者等于N，该N个竞争解决标识分别携带于N个MAC子PDU中。
可选地，接收单元610使用第一无线网络临时标识RNTI和第二RNTI接收响应消息；确定单元620根据对响应消息的接收情况确定响应消息的消息格式。
可选地，接收单元610在第一资源集合和第二资源集合上监听响应消息所对应的DCI；确定单元620根据对响应消息所对应的DCI的监听情况确定所述响应消息的消息格式。
可选地，第一资源集合包括控制信道资源集合和/或搜索空间，第二资源集合包括控制信道资源集合和/或搜索空间。
可选地，指示信息携带于该MAC PDU中，或者，指示信息携带于响应消息所对应的DCI中。
可选地，第一格式的响应消息或第二格式的响应消息中还包括以下信息中的至少一种：定时提前量命令、临时小区无线网络临时标识C-RNTI、上行授权。
可选地，控制面消息包括以下消息中的任意一种：无线资源控制RRC连接建立、RRC恢复、RRC重建立。
在一种可能的实现方式中，上述通信装置600可以为终端设备70，其中处理单元的功能可以由终端设备中的处理器702实现，收发单元的功能可以通过终端设备的收发器701(即控制电路与天线一起)实现。下文结合图21介绍本申请实施例的终端设备的结构。
图21是本申请实施例的一种终端设备的结构示意图。该终端设备可适用于图1所示出的系统中，执行上述方法实施例中终端设备的功能。为了便于说明，图21仅示出了终端设备的主要部件。如图21所示，终端设备70包括处理器、存储器、控制电路、天线以及输入输出装置。处理器主要用于对通信协议以及通信数据进行处理，以及对整个终端设备进行控制，执行软件程序，处理软件程序的数据，例如用于支持终端设备执行上述方法实施例中所描述的动作。存储器主要用于存储软件程序和数据。控制电路主要用于基带信号与射频信号的转换以及对射频信号的处理。控制电路和天线一起也可以叫做收发器，主要用于收发电磁波形式的射频信号。输入输出装置，例如触摸屏、显示屏，键盘等主要用于接收用户输入的数据以及对用户输出数据。
当终端设备开机后，处理器可以读取存储单元中的软件程序，解释并执行软件程序的指令，处理软件程序的数据。当需要通过无线发送数据时，处理器对待发送的数据进行基带处理后，输出基带信号至射频电路，射频电路将基带信号进行射频处理后将射频信号通过天线以电磁波的形式向外发送。当有数据发送到终端设备时，射频电路通过天线接收到射频信号，将射频信号转换为基带信号，并将基带信号输出至处理器，处理器将基带信号转换为数据并对该数据进行处理。
本领域技术人员可以理解，为了便于说明，图21仅示出了一个存储器和一个处理器。在实际的终端设备中，可以存在多个处理器和多个存储器。存储器也可以称为存储介质或 者存储设备等，本申请实施例对此不做限定。
作为一种可选的实现方式，处理器可以包括基带处理器和中央处理器，基带处理器主要用于对通信协议以及通信数据进行处理，中央处理器主要用于对整个终端设备进行控制，执行软件程序，处理软件程序的数据。图21中的处理器可以集成基带处理器和中央处理器的功能，本领域技术人员可以理解，基带处理器和中央处理器也可以是各自独立的处理器，通过总线等技术互联。本领域技术人员可以理解，终端设备可以包括多个基带处理器以适应不同的网络制式，终端设备可以包括多个中央处理器以增强其处理能力，终端设备的各个部件可以通过各种总线连接。所述基带处理器也可以表述为基带处理电路或者基带处理芯片。所述中央处理器也可以表述为中央处理电路或者中央处理芯片。对通信协议以及通信数据进行处理的功能可以内置在处理器中，也可以以软件程序的形式存储在存储单元中，由处理器执行软件程序以实现基带处理功能。
应理解，在本申请实施例中的处理器可以是中央处理单元(Central Processing Unit，CPU)，该处理器还可以是其他通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现成可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
还应理解，本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的随机存取存储器(random access memory，RAM)可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。
根据本申请实施例提供的方法，本申请还提供一种计算机程序产品，该计算机程序产品包括：计算机程序代码，当该计算机程序代码在计算机上运行时，使得该计算机执行图7或17所示实施例中任意一个实施例的方法。
根据本申请实施例提供的方法，本申请还提供一种计算机可读介质，该计算机可读介质存储有程序代码，当该程序代码在计算机上运行时，使得该计算机执行图7或17所示实施例中任意一个实施例的方法。
根据本申请实施例提供的方法，本申请还提供一种系统，其包括前述的一个或多个终端设备以及一个或多个网络设备。
上述实施例，可以全部或部分地通过软件、硬件、固件或其他任意组合来实现。当使用软件实现时，上述实施例可以全部或部分地以计算机程序产品的形式实现。所述计算机 程序产品包括一个或多个计算机指令或计算机程序。在计算机上加载或执行所述计算机指令或计算机程序时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以为通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集合的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质。半导体介质可以是固态硬盘。
为了便于理解，下文中对本申请介绍方案的过程中涉及的名词进行说明。
在本申请实施例中，“指示”可以包括直接指示和间接指示，也可以包括显式指示和隐式指示。将某一信息(如前文中的“指示信息”)所指示的信息称为待指示信息，则具体实现过程中，对待指示信息进行指示的方式有很多种，例如但不限于，可以直接指示待指示信息，如待指示信息本身或者该待指示信息的索引等。也可以通过指示其他信息来间接指示待指示信息，其中该其他信息与待指示信息之间存在关联关系。还可以仅仅指示待指示信息的一部分，而待指示信息的其他部分则是已知的或者提前约定的。例如，还可以借助预先约定(例如协议规定)的各个信息的排列顺序来实现对特定信息的指示，从而在一定程度上降低指示开销。
在本申请实施例中，各术语及英文缩略语，如媒体接入控制协议数据单元(MAC PDU)、小区无线网络临时标识(C-RNTI)、下行控制信息(DCI)、媒体接入控制控制元素(MAC CE)、无线资源控制(RRC)、物理下行控制信道(PDCCH)等，均为方便描述而给出的示例性举例，不应对本申请构成任何限定。本申请并不排除在已有或未来的协议中定义其它能够实现相同或相似功能的术语的可能。
在本申请实施例中，“第一”、“第二”以及各种数字编号仅为描述方便进行的区分，并不用来限制本申请实施例的范围。例如，区分不同的MAC子PDU等。
本申请实施例中涉及的“通信协议”可以是指通信领域的标准协议，例如可以包括LTE协议、NR协议以及应用于未来的通信系统中的相关协议，本申请对此不做限定。
本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (27)

  1. 一种随机接入的方法，其特征在于，包括：
    终端设备接收网络设备发送的响应消息；
    所述终端设备确定所述响应消息的消息格式，所述消息格式包括第一格式或者第二格式；
    所述终端设备根据确定的所述消息格式对所述响应消息进行解析；
    其中，第一格式的响应消息，包括竞争解决标识和控制面消息，
    第二格式的响应消息，包括竞争解决标识，且不包括控制面消息。
  2. 根据权利要求1所述的方法，其特征在于，所述第一格式的响应消息或者所述第二格式的响应消息携带于媒体接入控制MAC协议数据单元PDU中。
  3. 根据权利要求2所述的方法，其特征在于，所述MAC PDU包括第一MAC子PDU和第二MAC子PDU，所述第一格式的响应消息的所述竞争解决标识携带于所述第一MAC子PDU中，所述第一格式的响应消息的所述控制面消息携带于所述第二MAC子PDU中。
  4. 根据权利要求2所述的方法，其特征在于，所述第二格式的响应消息包括N个所述终端设备对应的N个竞争解决标识，所述N个竞争解决标识携带于所述MAC PDU中，N为大于或者等于2的整数。
  5. 根据权利要求4所述的方法，其特征在于，所述MAC PDU包括S个MAC子PDU，S大于或者等于N，所述N个竞争解决标识分别携带于N个MAC子PDU中。
  6. 根据权利要求1-5中任一项所述的方法，其特征在于，所述方法还包括：
    所述终端设备接收所述网络设备发送的指示信息，所述指示信息用于指示所述响应消息的消息格式。
  7. 根据权利要求1-5中任一项所述的方法，其特征在于，所述终端设备接收网络设备发送的响应消息，包括：
    所述终端设备使用第一无线网络临时标识RNTI和第二RNTI接收所述响应消息；
    所述终端设备确定所述响应消息的消息格式，包括：
    所述终端设备根据对所述响应消息的接收情况确定所述响应消息的消息格式。
  8. 根据权利要求1-5中任一项所述的方法，其特征在于，所述终端设备接收网络设备发送的响应消息，包括：
    所述终端设备在第一资源集合和第二资源集合上监听所述响应消息所对应的下行控制信息DCI；
    所述终端设备确定所述响应消息的消息格式，包括：
    所述终端设备根据对所述响应消息所对应的DCI的监听情况确定所述响应消息的消息格式。
  9. 根据权利要求8所述的方法，其特征在于，所述第一资源集合包括控制信道资源集合和/或搜索空间，所述第二资源集合包括控制信道资源集合和/或搜索空间。
  10. 根据权利要求6所述的方法，其特征在于，所述指示信息携带于所述MAC PDU中，或者，所述指示信息携带于所述响应消息所对应的DCI中。
  11. 根据权利要求1-10中任一项所述的方法，其特征在于，所述第一格式的响应消息或所述第二格式的响应消息中还包括以下信息中的至少一种：
    定时提前量命令、临时小区无线网络临时标识C-RNTI、上行授权。
  12. 根据权利要求1-11中任一项所述的方法，其特征在于，所述控制面消息包括以下信息中的任意一种：
    无线资源控制RRC连接建立、RRC恢复、RRC重建立。
  13. 一种随机接入的方法，其特征在于，包括：
    网络设备确定响应消息的消息格式，所述消息格式包括第一格式或者第二格式；
    所述网络设备使用确定的所述消息格式向终端设备发送所述响应消息；
    其中，第一格式的响应消息，包括竞争解决标识和控制面消息，
    第二格式的响应消息，包括竞争解决标识，且不包括控制面消息。
  14. 根据权利要求13所述的方法，其特征在于，所述第一格式的响应消息或者所述第二格式的响应消息携带于媒体接入控制MAC协议数据单元PDU中。
  15. 根据权利要求14所述的方法，其特征在于，所述MAC PDU包括第一MAC子PDU和第二MAC子PDU，所述第一格式的响应消息的所述竞争解决标识携带于所述第一MAC子PDU中，所述第一格式的响应消息的所述控制面消息携带于所述第二MAC子PDU中。
  16. 根据权利要求14所述的方法，其特征在于，所述第二格式的响应消息包括N个所述终端设备对应的N个竞争解决标识，所述N个竞争解决标识携带于所述MAC PDU中，N为大于或者等于2的整数。
  17. 根据权利要求16所述的方法，其特征在于，所述MAC PDU包括S个MAC子PDU，S大于或者等于N，所述N个竞争解决标识分别携带于N个MAC子PDU中。
  18. 根据权利要求13-17中任一项所述的方法，其特征在于，所述方法还包括：
    所述网络设备向所述终端设备发送指示信息，所述指示信息用于指示所述响应消息的消息格式。
  19. 根据权利要求13-17中任一项所述的方法，其特征在于，所述网络设备使用确定的响应消息的消息格式向终端设备发送所述响应消息，包括：
    当所述网络设备确定的响应消息的消息格式为第一格式时，所述网络设备使用第一无线网络临时标识RNTI发送所述第一格式的响应消息；
    当所述网络设备确定的响应消息的消息格式为第二格式时，所述网络设备使用第二RNTI发送所述第二格式的响应消息。
  20. 根据权利要求13-17中任一项所述的方法，其特征在于，所述网络设备使用确定的响应消息的消息格式向终端设备发送所述响应消息，包括：
    当所述网络设备确定的响应消息的消息格式为第一格式时，所述网络设备在第一资源集合上发送所述第一格式的响应消息所对应的下行控制信息DCI；
    当所述网络设备确定的响应消息的消息格式为第二格式时，所述网络设备在第二资源集合上发送所述第二格式的响应消息所对应的DCI。
  21. 根据权利要求20所述的方法，其特征在于，所述第一资源集合包括控制信道资源集合和/或搜索空间，所述第二资源集合包括控制信道资源集合和/或搜索空间。
  22. 根据权利要求18所述的方法，其特征在于，所述指示信息携带于所述MAC PDU中，或者，所述指示信息携带于所述响应消息所对应的DCI中。
  23. 根据权利要求13-22中任一项所述的方法，其特征在于，所述第一格式的响应消息或所述第二格式的响应消息中还包括以下信息中的至少一种：
    定时提前量命令、临时小区无线网络临时标识C-RNTI、上行授权。
  24. 根据权利要求13-23中任一项所述的方法，其特征在于，所述控制面消息包括以下信息中的任意一种：
    无线资源控制RRC连接建立、RRC恢复、RRC重建立。
  25. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质上存储有计算机程序，当所述计算机程序在计算机上运行时，
    使得所述计算机执行如权利要求1至12中任意一项所述的方法，或者，
    使得所述计算机执行如权利要求13至24中任意一项所述的方法。
  26. 一种芯片系统，其特征在于，包括：处理器，用于从存储器中调用并运行计算机程序，
    使得安装有所述芯片系统的通信设备执行如权利要求1至12中任意一项所述的方法；或者，
    使得安装有所述芯片系统的通信设备执行如权利要求13至24中任意一项所述的方法。
  27. 一种通信装置，其特征在于，包括至少一个处理器，所述至少一个处理器用于与存储器耦合，读取并执行所述存储器中的指令，
    以实现如权利要求1至12中任一项所述的方法，或者，
    以实现如权利要求13至24中任一项所述的方法。
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