WO2022001797A1 - Procédé et dispositif de transmission de données - Google Patents

Procédé et dispositif de transmission de données Download PDF

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Publication number
WO2022001797A1
WO2022001797A1 PCT/CN2021/101909 CN2021101909W WO2022001797A1 WO 2022001797 A1 WO2022001797 A1 WO 2022001797A1 CN 2021101909 W CN2021101909 W CN 2021101909W WO 2022001797 A1 WO2022001797 A1 WO 2022001797A1
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WIPO (PCT)
Prior art keywords
harq process
terminal
data packet
random access
network device
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PCT/CN2021/101909
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English (en)
Chinese (zh)
Inventor
徐修强
吴艺群
陈雁
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present application relates to the field of communication technologies, and in particular, to a data transmission method and apparatus.
  • Uplink dynamic authorization-free transmission is an "on-the-go" uplink data transmission method, that is, when the terminal needs to send data to the base station, the terminal directly uses the configuration authorization resources and pre-configured transmission parameters to send data to the base station, There is no need to first send a scheduling request to the base station and wait for a dynamic grant sent by the base station.
  • uplink dynamic grant-free transmission has the beneficial effects of significantly reducing signaling overhead, transmission delay, and terminal power consumption.
  • the terminal can use the configured authorized resources to transmit uplink data.
  • the terminal may consider that the currently stored TA is invalid. Therefore, the terminal can trigger a random access (RA) procedure to obtain an accurate TA again.
  • RA random access
  • the terminal needs to clear the HARQ process when the uplink dynamic grant-free transmission falls back to the random access process.
  • the unsuccessfully transmitted data packets are stored in the storage area of the HARQ process, so that the storage area of the HARQ process can be used to cache the data of message A (message A, MsgA) or message 3 (message 3, Msg3) in the random access process. Since the storage area of the HARQ process no longer stores the unsuccessfully transmitted data packet, the physical layer of the terminal loses the data packet. Furthermore, when the terminal needs to retransmit the data packet to the network device, the upper layer of the terminal needs to retransmit the data packet to the physical layer of the terminal, which increases the transmission delay of the data packet.
  • the present application relates to a data transmission method and device, which are used to solve the problem that in the prior art, after the terminal falls back from the uplink dynamic authorization-free transmission to the random access process, the data packets that have not been successfully transmitted are lost or require high-level retransmission. problem.
  • a data transmission method comprising: a terminal sends a data packet to a network device using a configuration authorization resource; under the condition that a preset condition is met, the terminal sends a data packet in a first hybrid automatic repeat request (HARQ ) process storage area to store the data packet, and perform a random access process, wherein the first HARQ process is different from the second HARQ process, and the second HARQ process is the HARQ process used in the random access process; After the entry process, the terminal transmits the data packet.
  • HARQ hybrid automatic repeat request
  • the terminal stores the unsuccessful transmission in the storage area of the HARQ process (that is, the first HARQ process) used in the non-random access process the data package. In this way, it is avoided that the physical layer of the terminal loses the data packet. Therefore, after the random access procedure is completed, the terminal can send the data packet without waiting for the upper layer to retransmit the data packet to the physical layer, thereby reducing the transmission delay of the data packet.
  • the HARQ process that is, the first HARQ process
  • the terminal uses the configuration authorization resource to send the data packet to the network device, including: the terminal uses the configuration authorization resource corresponding to the target HARQ process to send the data packet to the network device; wherein, the target HARQ process is the first HARQ process or the first HARQ process. Two HARQ processes.
  • the preset conditions include one or more of the following: (condition 1) the terminal does not receive feedback information on the data packet from the network device within the first preset time period; (condition 2) the terminal is in the second No feedback information from the network device to the target HARQ process is received within the preset time period; (condition 3) the terminal receives the indication information sent by the network device, and the indication information is used to instruct the terminal to perform a random access procedure.
  • transmitting the data packet by the terminal includes: the terminal retransmits the data packet by using the configuration authorization resource corresponding to the first HARQ process or the configuration authorization resource corresponding to the third HARQ process.
  • the configuration authorization resource corresponding to the third HARQ process is earlier than the configuration authorization resource corresponding to the first HARQ process in the time domain. In this way, compared with using the configuration authorization resource corresponding to the first HARQ process, the terminal uses the configuration authorization resource corresponding to the third HARQ process to transmit the data packet, which can reduce the waiting time of the data packet for transmission.
  • the terminal transmits data packets, including: the terminal uses the received downlink control information
  • the uplink transmission resource indicated by (downlink control information, DCI) transmits the data packet.
  • DCI downlink control information
  • the uplink transmission resources indicated by the DCI may be more flexible, so that the uplink transmission resources indicated by the DCI may be earlier than the configuration grant resources corresponding to the first HARQ process in the time domain.
  • the terminal uses the uplink transmission resource indicated by the DCI to transmit the data packet, which can reduce the waiting time of the data packet for transmission, thereby uploading the data packet as soon as possible.
  • the DCI also includes an index value of a modulation and coding scheme (MCS), and the transport block size TBS corresponding to the index value of the MCS is equal to the TBS of the data packet.
  • MCS modulation and coding scheme
  • the method before the terminal transmits the data packet, the method further includes: the terminal sends first indication information to the network device, where the first indication information is used to instruct the storage area of the first HARQ process to store the data packet; the terminal receives the network device. DCI sent by the device.
  • the first indication information is carried in message 3 or uplink control information; or, if the random access process is a two-step random access process process, the first indication information is carried in message A or uplink control information (uplink control information, UCI). It can be understood that, the terminal transmits the first indication information by multiplexing the signaling in the random access process, which can reduce signaling overhead.
  • the method before the terminal uses the configuration authorization resource to send the data packet to the network device, the method further includes: the terminal determines that the TA stored by itself is valid.
  • a communication apparatus including: a communication unit, configured to send a data packet to a network device using a configuration authorization resource; The data packet is stored in the HARQ, and the random access process is performed; wherein, the first HARQ process is different from the second HARQ process, and the second HARQ process is the HARQ process used in the random access process; the communication unit is also used to complete the random access process. After the entry process, the packet is transmitted.
  • the communication unit is specifically configured to send a data packet to the network device by using the configuration authorization resource corresponding to the target HARQ process, wherein the target HARQ process is the first HARQ process or the second HARQ process.
  • the preset conditions include one or more of the following: (condition 1) the terminal does not receive feedback information on the data packet from the network device within the first preset time period; (condition 2) the terminal is in the second No feedback information from the network device to the target HARQ process is received within the preset time period; (condition 3) the terminal receives the indication information sent by the network device, and the indication information is used to instruct the terminal to perform a random access procedure.
  • the communication unit is specifically configured to retransmit the data packet by using the configuration authorization resource corresponding to the first HARQ process or the configuration authorization resource corresponding to the third HARQ process.
  • the configuration authorization resource corresponding to the third HARQ process is earlier than the configuration authorization resource corresponding to the first HARQ process in the time domain.
  • the communication unit is specifically configured to transmit the data packet by using the uplink transmission resource indicated by the received downlink control information DCI.
  • the DCI further includes an index value of the MCS, and the transport block size TBS corresponding to the index value of the MCS is equal to the TBS of the data packet.
  • the communication unit is further configured to send first indication information to the network device, where the first indication information is used to instruct the storage area of the first HARQ process to store data packets; and receive the DCI sent by the network device.
  • the first indication information is carried in message 3 or uplink control information; or, if the random access process is a two-step random access process process, the first indication information is carried in the message A or the uplink control information.
  • the processing unit is also used to determine that the TA stored by itself is valid.
  • a communication device comprising: a processor, which is coupled to a memory, reads instructions in the memory, and implements the data transmission method described in the first aspect according to the instructions.
  • a computer-readable storage medium is provided, and instructions are stored in the computer-readable storage medium, which, when executed on a communication device, enable the communication device to execute the data transmission method described in the first aspect.
  • a computer program product comprising instructions which, when executed on a communication device, enable the communication device to perform the data transmission method described in the first aspect above.
  • a chip in a sixth aspect, includes a processing module and a communication interface, the communication interface is used for receiving an input signal and providing it to the processing module, and/or for outputting a signal generated by the processing module, and the processing module is used for The data transmission method described in any one of the first aspect above is performed.
  • the processing module may execute code instructions to execute the data transmission method described in any one of the first aspect above.
  • the code instruction can come from a memory inside the chip or from a memory outside the chip.
  • the processing module may be a processor, a microprocessor or an integrated circuit integrated on the chip.
  • the communication interface can be an input-output circuit or a transceiver pin on the chip.
  • FIG. 1 is a schematic diagram of a two-step-based random access process provided by an embodiment of the present application
  • FIG. 2 is a schematic diagram of a four-step-based random access according to an embodiment of the present application
  • FIG. 3 is a schematic diagram of the architecture of a communication system provided by an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a communication device according to an embodiment of the present application.
  • FIG. 5 is a flowchart of a data transmission method provided by an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a communication device according to an embodiment of the present application.
  • indication may include direct indication and indirect indication, as well as explicit indication and implicit indication.
  • the information indicated by certain information is called information to be indicated, and in the specific implementation process, there are many ways to indicate the information to be indicated.
  • the information to be indicated may be directly indicated, wherein the information to be indicated itself or an index of the information to be indicated, etc.
  • the information to be indicated may also be indirectly indicated by indicating other information, wherein there is an association relationship between the other information and the information to be indicated.
  • only a part of the information to be indicated may be indicated, while other parts of the information to be indicated are known or agreed in advance.
  • the indication of specific information can also be implemented by means of the arrangement order of each information pre-agreed (for example, stipulated by the protocol), thereby reducing the indication overhead to a certain extent.
  • the configuration authorization resource may include a first type (type1) configuration grant (configured grant type 1) resource, and a second type (type2) configuration grant (configured grant type 2) resource.
  • the configuration method of type1CG resources is: the network device configures all transmission resources and transmission parameters for the terminal through high-level parameters (such as ConfiguredGrantConfig), such as: time domain resource period, open-loop power control related parameters, waveform, redundancy version sequence, repetition frequency, frequency hopping mode, resource allocation type, number of hybrid automatic repeat request (HARQ) processes, DMRS-related parameters, MCS table, resource block group (RBG) size, and time domain resources, All transmission resources and transmission parameters including frequency domain resources, MCS, etc.
  • high-level parameters such as ConfiguredGrantConfig
  • the configuration method of type2 CG resources is as follows: First, the network device configures some transmission resources and transmission parameters to the terminal through high-level parameters (such as ConfiguredGrantConfig), such as the period of time domain resources, open-loop power control related parameters, waveforms, and redundant version sequences. , number of repetitions, frequency hopping mode, resource allocation type, number of HARQ processes, DMRS related parameters, modulation and coding strategy table, RBG size; after that, the network device sends DCI (for example, Configured-Scheduling Radio Network Temporary Identity scrambled DCI to the terminal) ) to activate type2 CG resources, and configure transmission resources and transmission parameters including time domain resources, frequency domain resources, DMRS-related parameters, MCS, etc. at the same time. It should be noted that the type2 CG resource can only be used after being activated.
  • DCI for example, Configured-Scheduling Radio Network Temporary Identity scrambled DCI to the terminal
  • the configuration authorization resource may have other names, such as a pre-configured uplink resource (PUR), which is not limited in this embodiment of the present application.
  • PUR pre-configured uplink resource
  • the random access process is a process of establishing a connection with a network device before a terminal enters a connected/active state from an idle/inactive state.
  • the main purpose of the random access procedure is to establish uplink synchronization and to request the network device to allocate uplink resources to the terminal, so that the terminal can perform corresponding data transmission through the uplink resources.
  • the random access procedure can be divided into two-step based random access (2-step RA) and four-step based random access (4-step RA).
  • the terminal sends a message 1 (message 1, Msg1) to a network device.
  • the Msg1 includes a preamble.
  • the network device After receiving the Msg1, the network device sends the Msg2 to the terminal.
  • the Msg2 includes RAR.
  • the RAR may include an uplink scheduling grant (UL grant), the number of the preamble received by the network device, the timing adjustment information, the uplink resource location indication information allocated for the terminal device, and the temporarily allocated cell wireless network temporary identity (temporary cell). radio network temporary identifier, TC-RNTI), etc.
  • the terminal sends Msg3 to the network device.
  • the network device sends Msg4 to the terminal.
  • the Msg4 includes a contention resolution message (CRM).
  • CCM contention resolution message
  • the terminal device When the terminal device receives the message 4, and the received contention resolution identity (CRID) of the CRM matches the identification information transmitted by the terminal, the terminal device may consider that the random access is successful.
  • CID contention resolution identity
  • the terminal sends a message A (message A, MsgA) to a network device.
  • a message A messages A, MsgA
  • the MsgA is composed of a physical random access channel (physical random access channel, PRACH) and a physical uplink shared channel (physical uplink shared channel, PUSCH); wherein, the PRACH is used for sending a preamble (preamble), the PUSCH is used to transmit control plane (CP) data.
  • PRACH physical random access channel
  • PUSCH physical uplink shared channel
  • the Preamble is used to indicate the accurate time of the effective signal access of the network device, so as to avoid the loss of the effective signal.
  • the network device sends a message B (message B, MsgB) to the terminal.
  • a message B (message B, MsgB)
  • the MsgB when the network device successfully decodes the MsgA and obtains the PUSCH, the MsgB includes a random access response (RA response, RAR) used to indicate that the PUSCH is successfully received.
  • RA response RAR
  • the MsgB when the network device fails to decode the MsgA and does not obtain the PUSCH, the MsgB includes an RAR for indicating the failure to receive the PUSCH.
  • MsgA in 2-step RA can be regarded as the merger of Msg1 and Msg3 in 4-step RA
  • MsgB can be regarded as the merger of Msg2 and Msg4. Therefore, compared with 4-step RA, 2 -step RA can achieve lower access delay.
  • EDT is essentially a kind of RA, the difference is that EDT can make the terminal or network device use the steps in the RA to transmit data, so as to reduce the signaling overhead and the power consumption of the terminal.
  • the terminal can carry the uplink user plane data in Msg3 and send it to the base station.
  • the base station may carry the downlink user data in Msg4 and send it to the terminal.
  • the terminal can carry the uplink user plane data in the MsgA and send it to the base station.
  • the base station may carry the downlink user data in the MsgB and send it to the terminal.
  • the base station Since the base station does not know the capabilities of the terminal and the size of the data packet to be transmitted, the base station configures a threshold of the transport block size (TBS), and the UE decides whether to use the EDT technology to transmit data according to the threshold of the TBS.
  • TBS transport block size
  • the data to be sent When the data to be sent is less than or equal to TBS, the data to be sent can be transmitted by using the EDT technology. When the data to be sent is larger than TBS, the data to be sent cannot be transmitted by using the EDT technology.
  • An important feature of uplink transmission is that uplink transmissions from different terminals in the same cell do not interfere with each other.
  • the network equipment In order to avoid intra-cell interference, the network equipment requires that signals from different terminals in the same subframe but different frequency domain resources (eg, different resource blocks (RBs)) arrive at the network equipment at a time basically aligned. As long as the network device receives the uplink data sent by the terminal within the cyclic prefix (Cyclic Prefix, CP) range, it can correctly decode the uplink data. Therefore, uplink synchronization requires the time when signals from different terminals in the same subframe arrive at the network device. All fall within the CP.
  • CP Cyclic Prefix
  • the main function of the TA is to ensure the uplink synchronization between the terminal and the network equipment.
  • TA is essentially a negative offset (negative offset) between the start time of receiving the downlink subframe and the time of transmitting the uplink subframe.
  • the network device can control the time when the uplink signals from different terminals arrive at the network device. For a terminal farther away from the network device, due to a larger transmission delay, it is necessary to send uplink data earlier than a terminal closer to the network device.
  • HARQ is a technology that combines forward error correction (or forward error correction code) (forward error correction, FEC) and automatic repeat request (automatic repeat request, ARQ) methods. Errors are automatically corrected within the error correction capability range, and beyond the error correction range, the sender is required to retransmit, which increases system reliability and improves system transmission efficiency.
  • FEC forward error correction code
  • ARQ automatic repeat request
  • FEC means that the data sent by the sender includes forward error correction codes or redundant information.
  • the receiver receives the data, it passes a check (for example, cyclic redundancy check (CRC)) ) After an error is found, it can be corrected by forward error correction code or redundant information, so that the sender can reduce the number of retransmissions (ie, retransmit data).
  • CRC cyclic redundancy check
  • ARQ means that the receiving end judges the correctness of the received data by checking (for example, CRC check), if the data is received correctly, the receiving end sends an ACK to inform the sending end, otherwise the receiving end sends a NACK to inform the sending end, and the sending end receives When NACK, the data can be retransmitted to the receiver.
  • ACK and NACK are HARQ feedback.
  • HARQ uses the stop-and-wait protocol to send data.
  • the stop-and-wait protocol after the sender sends a transport block (TB), it stops and waits for an acknowledgment.
  • the receiver will use 1-bit information to perform ACK feedback or NACK feedback on the TB.
  • the sender stops and waits for an acknowledgment after each transmission, resulting in very low throughput. Therefore, multiple parallel HARQ processes can be used: while one HARQ process is waiting for an acknowledgment, the sender can use another HARQ process to continue sending data.
  • the terminal uses the first HARQ process to send TB1, finishes sending TB1 at time T1, receives HARQ feedback from TB1 at time T2, and waits for the confirmation of TB1 during the time period from T1 to T2, and waits for the confirmation of this time.
  • the second HARQ process can be used to send TB2, after sending TB2 at time T2, and receiving HARQ feedback of TB2 at time T3, during the time period from T2 to T3, wait for the confirmation of TB2, and wait for the confirmation of this time.
  • the third HARQ process can be used to send TB3.
  • each HARQ process can process one TB in one transmission time interval (transmission time interval, TTI), and can also process multiple TBs (for example, in the case of space division multiplexing).
  • TTI transmission time interval
  • one grant resource (eg, uplink grant or sideline grant) is associated with one HARQ process.
  • multiple authorized resources included in a TTI package (bundle) are associated with the same HARQ process, that is, transmission on multiple authorized resources included in a TTI bundle (for example, uplink transmission, or, sideline transmission, or, downlink transmission) corresponds to the same HARQ process.
  • a TTI bundle includes multiple consecutive TTIs.
  • the transmission in a TTI bundle can be understood as a TB needs to perform one or more retransmissions after a new transmission, and the transmitting end associates multiple transmissions of the same TB with the same HARQ process.
  • the data received multiple times in the same HARQ process may be put into the same buffer (for example, a HARQ buffer (buffer) or a soft buffer (soft buffer)) for soft combining and decoding.
  • one HARQ process may be identified by an ID of one HARQ process.
  • the technical solutions provided in the embodiments of the present application can be applied to various communication systems, for example, a Long Term Evolution (LTE) communication system, a new radio (NR) using the fifth generation (5th generation, 5G) communication technology ) communication system, future evolution system or multiple communication fusion systems, etc.
  • the technical solutions provided in this application can be applied to various application scenarios, such as machine to machine (M2M), macro-micro communication, enhanced mobile broadband (eMBB), ultra-reliable and ultra-low latency Communication (ultra-reliable & low latency communication, uRLLC) and massive IoT communication (massive machine type communication, mMTC) and other scenarios.
  • M2M machine to machine
  • eMBB enhanced mobile broadband
  • uRLLC ultra-reliable and ultra-low latency Communication
  • massive IoT communication massive machine type communication
  • the communication system architecture may include one or more network devices (only one is shown in FIG. 3 ) and one or more network devices connected to each network device. multiple terminals.
  • the network device may be a base station or a base station controller for wireless communication.
  • the base station may include various types of base stations, such as a micro base station (also referred to as a small cell), a macro base station, a relay station, an access point, etc., which are not specifically limited in this embodiment of the present application.
  • the base station may be an evolutional node B (evolutional node B, eNB or e-NodeB) in long term evolution (long term evolution, LTE), an internet of things (internet of things, IoT) or a narrowband thing
  • the eNB in the Internet of Things (narrow band-internet of things, NB-IoT), the base station in the future 5G mobile communication network or the future evolution of the public land mobile network (public land mobile network, PLMN), the embodiment of this application does not make any limit.
  • the apparatus for implementing the function of the network device may be the network device, or may be an apparatus capable of supporting the network device to implement the function, such as a chip system.
  • the technical solutions provided by the embodiments of the present application are described by taking the apparatus for implementing the functions of the network equipment as the network equipment as an example.
  • the network equipment mentioned in this application such as a base station, generally includes a baseband unit (baseband unit, BBU), a remote radio unit (remote radio unit, RRU), an antenna, and a feeder for connecting the RRU and the antenna.
  • BBU baseband unit
  • RRU remote radio unit
  • the BBU is used for signal modulation.
  • the RRU is responsible for radio frequency processing.
  • the antenna is responsible for the conversion between the guided traveling waves on the cable and the space waves in the air.
  • the distributed base station greatly shortens the length of the feeder between the RRU and the antenna, which can reduce the signal loss and the cost of the feeder.
  • the RRU plus antenna is relatively small and can be installed anywhere, making network planning more flexible.
  • all BBUs can be centralized and placed in the central office (CO). Through this centralized method, the number of base station computer rooms can be greatly reduced, and supporting equipment, especially air conditioners, can be reduced. Energy consumption can reduce a lot of carbon emissions.
  • the scattered BBUs after the scattered BBUs are integrated into a BBU baseband pool, they can be managed and scheduled in a unified manner, and resource allocation is more flexible. In this mode, all physical base stations have evolved into virtual base stations. All virtual base stations share the user's data transmission and reception, channel quality and other information in the BBU baseband pool, and cooperate with each other to realize joint scheduling.
  • a base station may include a centralized unit (CU) and a distributed unit (DU).
  • the base station may also include an active antenna unit (AAU).
  • the CU implements some functions of the base station, and the DU implements some functions of the base station.
  • the CU is responsible for processing non-real-time protocols and services, and implementing functions of radio resource control (RRC) and packet data convergence protocol (PDCP) layers.
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • the DU is responsible for processing physical layer protocols and real-time services, and implementing functions of the radio link control (RLC), media access control (MAC), and physical (PHY) layers.
  • RLC radio link control
  • MAC media access control
  • PHY physical
  • the network device may be a device including one or more of a CU node, a DU node, and an AAU node.
  • the CU can be divided into network devices in the RAN, and the CU can also be divided into network devices in the core network (core network, CN), which is not limited here.
  • a terminal is a device with wireless transceiver function. Terminals can be deployed on land, including indoor or outdoor, handheld or vehicle; can also be deployed on water (such as ships, etc.); can also be deployed in the air (such as aircraft, balloons and satellites, etc.).
  • the terminal equipment may be user equipment (user equipment, UE).
  • the UE includes a handheld device, a vehicle-mounted device, a wearable device or a computing device with a wireless communication function. Exemplarily, the UE may be a mobile phone, a tablet computer, or a computer with a wireless transceiver function.
  • the terminal device can also be a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in telemedicine, intelligent Wireless terminals in power grids, wireless terminals in smart cities, wireless terminals in smart homes, and so on.
  • the device for implementing the function of the terminal may be a terminal, or may be a device capable of supporting the terminal to implement the function, such as a chip system.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • the technical solutions provided by the embodiments of the present application are described by taking the device for realizing the functions of the terminal as the terminal as an example.
  • the network architecture and service scenarios described in the embodiments of the present application are for the purpose of illustrating the technical solutions of the embodiments of the present application more clearly, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application.
  • the evolution of the architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.
  • FIG. 4 is a schematic diagram of a hardware structure of a network device and a terminal according to an embodiment of the present application.
  • the terminal includes at least one processor 101 and at least one transceiver 103 .
  • the terminal may further include an output device 104 , an input device 105 and at least one memory 102 .
  • the processor 101, the memory 102 and the transceiver 103 are connected by a bus.
  • the processor 101 may be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more modules for controlling the execution of the programs of the present application. integrated circuit.
  • the processor 101 may also include multiple CPUs, and the processor 101 may be a single-CPU processor or a multi-CPU processor.
  • a processor herein may refer to one or more devices, circuits, or processing cores for processing data (eg, computer program instructions).
  • the memory 102 may be read-only memory (ROM) or other type of static storage device that can store static information and instructions, random access memory (RAM), or other type of static storage device that can store information and instructions It can also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, CD-ROM storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or capable of carrying or storing desired program code in the form of instructions or data structures and capable of being executed by a computer Any other medium accessed is not limited in this embodiment of the present application.
  • the memory 102 may exist independently and be connected to the processor 101 through a bus.
  • the memory 102 may also be integrated with the processor 101 .
  • the memory 102 is used for storing the application program code for executing the solution of the present application, and the execution is controlled by the processor 101 .
  • the processor 101 is configured to execute the computer program codes stored in the memory 102, so as to implement the methods provided by the embodiments of the present application.
  • the transceiver 103 can use any transceiver-like device for communicating with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc. .
  • the transceiver 103 includes a transmitter Tx and a receiver Rx.
  • the output device 104 communicates with the processor 101 and can display information in a variety of ways.
  • the output device 104 may be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector (projector) Wait.
  • the input device 105 is in communication with the processor 101 and can receive user input in a variety of ways.
  • the input device 105 may be a mouse, a keyboard, a touch screen device, a sensor device, or the like.
  • the network device includes at least one processor 201 , at least one memory 202 , at least one transceiver 203 and at least one network interface 204 .
  • the processor 201, the memory 202, the transceiver 203 and the network interface 204 are connected by a bus.
  • the network interface 204 is used to connect with the core network device through a link (such as the S1 interface), or connect with the network interface of other network devices through a wired or wireless link (such as the X2 interface) (not shown in the figure), This embodiment of the present application does not specifically limit this.
  • the processor 201, the memory 202, and the transceiver 203 reference may be made to the description of the processor 101, the memory 102, and the transceiver 103 in the terminal, and details are not repeated here.
  • a data transmission method provided in an embodiment of the present application includes the following steps:
  • the terminal sends a data packet to a network device by using a configuration authorization resource.
  • the configuration authorization resources include time domain resources. Further, the configuration authorized resources may also include airspace resources and/or frequency domain resources.
  • the configuration authorization resource usually occurs periodically.
  • the terminal may be configured with multiple configuration authorization resources.
  • the configuration authorization resource may be configured to the terminal by the network device.
  • the terminal may receive the configuration information of the uplink dynamic authorization-free transmission sent by the network device, and then the terminal may determine to configure the authorization resource according to the configuration information of the uplink dynamic authorization-free transmission.
  • the configuration information of uplink dynamic authorization-free transmission can be carried in radio resource control (radio resource control, RRC) signaling, media access control (media access control, MAC) signaling, or downlink control information (downlink control information, DCI).
  • RRC radio resource control
  • MAC media access control
  • DCI downlink control information
  • Uplink dynamic grant-free transmission can also be called uplink transmission without scheduling (uplink transmission without scheduling) or uplink transmission with configured grant.
  • the configuration authorization resource may be pre-agreed between the terminal and the network device, or pre-defined in a communication standard.
  • the terminal sends the data packet to the network device by using the configuration authorization resource corresponding to the target HARQ process.
  • the target HARQ process is one of multiple HARQ processes supported by the terminal.
  • the target HARQ process supports uplink dynamic grant-free transmission.
  • only one HARQ process may support uplink dynamic grant-free transmission, or there may be multiple HARQ processes support uplink dynamic grant-free transmission.
  • this HARQ process corresponds to all configured grant resources.
  • one HARQ process in the multiple HARQ processes corresponds to one or more configuration grant resources.
  • the target HARQ process may be the first HARQ process or the second HARQ process.
  • both the first HARQ process and the second HARQ process support uplink dynamic grant-free transmission.
  • the second HARQ process is the HARQ process used in the random access process.
  • the first HARQ process is different from the second HARQ process.
  • the target HARQ process is the first HARQ process if only one HARQ process configured by the terminal supports uplink dynamic grant-free transmission.
  • the target HARQ process may be the first HARQ process or the second HARQ process.
  • the target HARQ process can be determined in the following manner:
  • the target HARQ process may be configured by signaling sent by the network device to the terminal.
  • the signaling sent by the network device to the terminal carries the target HARQ process ID, so the terminal can determine the target HARQ process according to the target HARQ process ID.
  • the target HARQ process may be determined according to the index of the configuration authorization resource used by the terminal.
  • the index for configuring the grant resource may be a slot index, a symbol index, or the like.
  • the terminal can determine the corresponding HARQ process according to an index of a configuration authorization resource.
  • the target HARQ process may be determined according to other parameters.
  • other parameters may be the period for configuring the grant resource, and/or the maximum number of HARQ processes supported by uplink dynamic free grant transmission, and/or the offset value of the HAQR process number.
  • the target HARQ process may also be determined in other manners, which is not limited in this embodiment of the present application.
  • the terminal may determine that the TA currently stored by the terminal is valid.
  • the terminal determines that the TA stored by itself is invalid, the terminal will first obtain a valid TA, and then execute step S301.
  • the terminal determines whether the currently stored TA is valid, and may adopt one or more of the following implementation manners:
  • Manner 1 The terminal is provided with a timer, and the timer is used to record the effective duration of the currently stored TA. Furthermore, if the timer does not expire, the terminal determines that the currently stored TA is valid; or, if the timer expires, the terminal determines that the currently stored TA is invalid.
  • Mode 2 The terminal determines whether the currently stored TA is valid according to whether the serving cell has changed. Wherein, whether the serving cell has changed refers to whether the first cell and the second cell are the same cell.
  • the first cell is a cell currently serving the terminal.
  • the second cell is the cell corresponding to the TA currently stored by the terminal.
  • the terminal determines that the currently stored TA is valid; or, if the first cell and the second cell are not the same cell, the terminal determines that the currently stored TA is invalid.
  • Manner 3 The terminal determines whether the currently stored TA is valid according to at least two measurement results of the signal quality of the cell.
  • the terminal determines that the currently stored TA is valid; or, if the difference between the first measurement result and the second measurement result is If the difference between them is greater than the preset value, the terminal determines that the currently stored TA is invalid.
  • the first measurement result may be the measurement result of the signal quality of the cell when the terminal stores the TA.
  • the second measurement result is the measurement result of the signal quality of the cell by the terminal at the current moment.
  • the signal quality of the cell may be a reference signal or a reference signal received power (reference signal received power, RSRP) of a synchronization signal block, which is not limited in this embodiment of the present application.
  • RSRP reference signal received power
  • the terminal stores the data packet in the storage area of the first HARQ process, and performs the random access process.
  • the preset conditions include one or more of the following:
  • the terminal does not receive the feedback information of the data packet from the network device within a first preset time period.
  • the first preset duration may be configured by signaling delivered by the network device, or set by the terminal and the network device in a pre-agreed manner, which is not limited in this embodiment of the present application.
  • the signaling for configuring the first preset duration may be carried in an RRC message, MAC CE or DCI.
  • the above feedback information may include: ACK information, NACK information or retransmission scheduling information.
  • Condition 2 The terminal does not receive feedback information from the network device on the target HARQ process within a second preset time period.
  • the second preset duration may be configured by signaling delivered by the network device, or set by the terminal and the network device in a pre-agreed manner, which is not limited in this embodiment of the present application.
  • the signaling for configuring the second preset duration may be carried in an RRC message, MAC CE or DCI.
  • Condition 3 The terminal receives the indication information sent by the network device.
  • the indication information is used to instruct the terminal to perform a random access procedure.
  • the random access process may be a two-step-based random access process, a four-step-based random access process, or a four-step-based data early transmission process, which is not limited in this embodiment of the present application.
  • the preset conditions may also be other conditions, which are not limited in this embodiment of the present application.
  • the terminal buffers the data packets stored in the storage area of the second HARQ process to the first HARQ process under the condition that the preset conditions are met. in the storage area of the second HARQ process, and clear the data packets stored in the storage area of the second HARQ process. After that, the terminal performs a random access procedure using the second HARQ process.
  • the terminal when the target HARQ process is the first HARQ process, stores the data packet in the storage area of the first HARQ process and uses the Two HARQ processes perform random access procedures.
  • the target HARQ process being the first HARQ process is beneficial to simplify the specific implementation of step S302.
  • the terminal After completing the random access process, the terminal transmits a data packet.
  • step S303 Three different implementation manners of step S303 will be described in detail below. Among them, the first implementation and the third implementation are applicable to the scenario in which the uplink dynamic grant-free transmission supports one or more HARQ processes.
  • Implementation mode 2 is suitable for a scenario where uplink dynamic grant-free transmission supports multiple HARQ processes.
  • Implementation manner 1 The terminal transmits the data packet by using the configuration authorization resource corresponding to the first HARQ process.
  • the terminal transmits the data packet by using the configuration authorization resource corresponding to the third HARQ process.
  • the third HARQ process is different from the first HARQ process and the second HARQ process.
  • the third HARQ process also supports uplink dynamic grant-free transmission.
  • the configuration authorization resource corresponding to the third HARQ process is earlier than the configuration authorization resource corresponding to the first HARQ process in the time domain. In this way, compared to using the configuration authorization resource corresponding to the first HARQ process, the terminal uses the configuration authorization resource corresponding to the third HARQ process to transmit the data packet, which can reduce the waiting time of the data packet for transmission.
  • the terminal may clear the data packets stored in the storage area of the first HARQ process.
  • Implementation mode 3 The terminal transmits the data packet by using the uplink transmission resource indicated by the received DCI.
  • the DCI is sent to the terminal by the network device after the random access procedure is completed.
  • the uplink transmission resources indicated by the DCI are earlier than the configuration authorization resources corresponding to the first HARQ process in the time domain.
  • the terminal uses the uplink transmission resources indicated by the DCI to transmit the data packets, which can reduce the waiting time of the data packets for transmission, thereby completing the uplink transmission of the data packets as soon as possible. transmission.
  • the DCI further includes an index value of the MCS.
  • the index value of the MCS is not a reserved (reserved) value
  • the TBS corresponding to the index value of the MCS is equal to the TBS corresponding to the data packet buffered by the first HARQ process.
  • the index value of the MAC is a reserved value
  • the TBS corresponding to the data packet buffered by the first HARQ process is equal to the TBS configured for uplink dynamic authorization-free transmission.
  • the DCI when there are multiple sets of CGs, or when one CG corresponds to multiple HARQ processes, the DCI further includes the CG index and/or the ID of the HARQ process.
  • the terminal may send the first indication information to the network device.
  • the first indication information is used to indicate that the data packet is stored in the storage area of the first HARQ process. After that, the terminal receives the DCI sent by the network device.
  • the terminal sends the first indication information to the network device after completing the random access procedure.
  • the terminal sends the first indication information to the network device during the random access process.
  • the first indication information when the first indication information is sent in the random access process, the first indication information can multiplex the signaling in the random access process, so as to reduce and save signaling overhead.
  • the first indication information is implemented in an explicit manner.
  • the first indication information may be information indicated by one bit.
  • the value of the one bit is the first value, which may represent the first indication information. It can be understood that the value of the one bit is other values, which can represent other information.
  • the value of the one bit is the second value, which represents the second indication information.
  • the second indication information is used to indicate that the data to be sent is not buffered in the storage area of the first HARQ process.
  • the first indication information may include the ID of the first HARQ process, so that the network device knows that the storage area of the first HARQ process stores data to be sent. Further, if the terminal is configured with multiple sets of CG configurations, and the HARQ processes used by the multiple sets of CG configurations overlap, the first indication information may further include: the number or index of the CG configuration.
  • the first indication information is carried in Msg3, which can be specifically implemented as: the first indication information carries In the MAC CE of Msg3.
  • the first indication information is carried in MsgB. It can be specifically implemented as: the first indication information is carried in the MAC CE of MsgA.
  • the first indication information is implemented in an implicit manner.
  • the terminal when the terminal sends the preamble with the first time-frequency resource, it indicates that the storage area of the first HARQ process stores the data to be sent, so that the terminal sends the first indication information to the network device implicitly. Purpose. On the contrary, when the terminal sends the preamble using the second time-frequency resource, it indicates that the storage area of the first HARQ process does not store the data to be sent. This is equivalent to that the terminal does not send the first indication information.
  • the terminal sends the first preamble, indicating that the storage area of the first HARQ process stores data to be sent, thereby implicitly achieving the purpose of the terminal sending the first indication information to the network device.
  • the terminal sends the second preamble, indicating that the storage area of the first HARQ process does not store the data to be sent. This is equivalent to that the terminal does not send the first indication information.
  • the indication information for indicating that the storage area of other HARQ processes stores data to be sent may refer to the implementation of the first indication information.
  • the terminal in the case where the uplink dynamic grant-free transmission falls back to the random access process, the terminal is in the storage area of the HARQ process (ie, the first HARQ process) used in the non-random access process. Stores packets that were not successfully transmitted. In this way, it is avoided that the physical layer of the terminal loses the data packet. Therefore, after the random access procedure is completed, the terminal can send the data packet without waiting for the upper layer to retransmit the data packet to the physical layer, thereby reducing the transmission delay of the data packet.
  • the HARQ process ie, the first HARQ process
  • the terminal includes corresponding hardware structures and/or software modules for executing each function.
  • the present application can be implemented in hardware, or in a combination of hardware and computer software. Whether a function is performed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.
  • the terminal may be divided into functional modules according to the foregoing method examples.
  • each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module.
  • the above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. It should be noted that, the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation. The following is an example of dividing each function module corresponding to each function to illustrate:
  • FIG. 6 it is a schematic structural diagram of a communication apparatus according to an embodiment of the present application.
  • the communication device includes a communication unit 301 and a processing unit 302 .
  • the communication unit 301 is used to support the communication device to perform steps S301 and S303 in FIG. 5 , and/or other processes used in the technical solutions described herein.
  • the processing unit 302 is configured to support the communication device to perform step S302 in FIG. 5 , and/or other processes for the technical solutions described herein. All relevant contents of the steps involved in the foregoing method embodiments can be cited in the functional descriptions of the corresponding functional modules, which will not be repeated here.
  • the processing unit 302 is configured to perform a random access procedure, including: the processing unit 302 is configured to generate a message (for example, Msg1, Msg3), and control the communication unit 301 to send a message (for example, Msg1, Msg3); and, Decodes messages received by the communication unit 301 (eg Msg2, Msg4).
  • a message for example, Msg1, Msg3
  • Msg1, Msg3 for example, Msg1, Msg3
  • Decodes messages received by the communication unit 301 eg Msg2, Msg4
  • the communication unit 301 is configured to send messages (eg, Msg1, Msg3) generated by the processing unit 302, and receive messages (eg, Msg2, Msg4) delivered by the network device.
  • the communication unit 301 in FIG. 6 may be implemented by the transceiver 103 in FIG. 4
  • the processing unit 302 in FIG. 6 may be implemented by the processor 101 in FIG. 4
  • This embodiment of the present application does not impose any limitation on this.
  • Embodiments of the present application also provide a computer-readable storage medium, where computer instructions are stored in the computer-readable storage medium; when the computer-readable storage medium runs on the terminal shown in FIG. 4 , the terminal is made to execute The data transmission method shown in Figure 5.
  • the computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server, or data center Transmission to another website site, computer, server, or data center by wire (eg, coaxial cable, optical fiber, digital subscriber line, DSL) or wireless (eg, infrared, wireless, microwave, etc.).
  • wire eg, coaxial cable, optical fiber, digital subscriber line, DSL
  • wireless eg, infrared, wireless, microwave, etc.
  • the computer-readable storage medium can be any available medium that can be accessed by a computer or data storage devices including one or more servers, data centers, etc. that can be integrated with the medium.
  • the usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media, or semiconductor media (eg, solid state disks (SSDs)), and the like.
  • Embodiments of the present application further provide a chip, which includes a processing module and a communication interface, where the communication interface is used to receive an input signal and provide it to the processing module, and/or to process and output a signal generated by the processing module.
  • the processing is used to support the terminal to perform the data transmission method shown in FIG. 5 .
  • the processing module may execute code instructions to perform the data transmission method shown in FIG. 5 .
  • the code instruction can come from a memory inside the chip or from a memory outside the chip.
  • the processing module is a processor, a microprocessor or an integrated circuit integrated on the chip.
  • the communication interface can be an input-output circuit or a transceiver pin.
  • the embodiment of the present application also provides a computer program product including computer instructions, which, when running on the terminal shown in FIG. 3 , enables the terminal to execute the data transmission method shown in FIG. 5 .
  • the terminal, computer storage medium, chip, and computer program product provided by the above-mentioned embodiments of the present application are all used to execute the method for license-free transmission provided above. Therefore, for the beneficial effects that can be achieved, reference may be made to the method provided above. The corresponding beneficial effects will not be repeated here.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente demande, qui appartient au domaine technique des communications, concerne un procédé et un dispositif de transmission de données qui permettent de résoudre le problème d'une perte de paquet lors d'une transmission non réussie d'un paquet de données dans un cas dans lequel une transmission dynamique de liaison montante sans licence se replie vers le processus d'accès aléatoire. Le procédé comprend : l'envoi, par un terminal, d'un paquet de données à un dispositif de réseau à l'aide d'une ressource avec licence de configuration; dans un cas dans lequel une condition prédéfinie est satisfaite, le stockage, par le terminal, du paquet de données dans une zone de stockage d'un premier processus HARQ, et l'exécution du processus d'accès aléatoire, le premier processus HARQ étant différent d'un second processus HARQ, et le second processus HARQ étant un processus HARQ utilisé dans le processus d'accès aléatoire; et après que le processus d'accès aléatoire est accompli, la transmission, par le terminal, du paquet de données. La présente demande est applicable au processus de transmission de données.
PCT/CN2021/101909 2020-06-29 2021-06-23 Procédé et dispositif de transmission de données Ceased WO2022001797A1 (fr)

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