WO2018012833A1 - Procédé de transmission efficace d'un message de commande pour accès aléatoire - Google Patents

Procédé de transmission efficace d'un message de commande pour accès aléatoire Download PDF

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Publication number
WO2018012833A1
WO2018012833A1 PCT/KR2017/007367 KR2017007367W WO2018012833A1 WO 2018012833 A1 WO2018012833 A1 WO 2018012833A1 KR 2017007367 W KR2017007367 W KR 2017007367W WO 2018012833 A1 WO2018012833 A1 WO 2018012833A1
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WIPO (PCT)
Prior art keywords
terminal
random access
downlink control
base station
control information
Prior art date
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Ceased
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PCT/KR2017/007367
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English (en)
Korean (ko)
Inventor
김요한
김재원
설대영
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Publication date
Priority claimed from KR1020170052805A external-priority patent/KR102317012B1/ko
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority to US16/316,208 priority Critical patent/US10887922B2/en
Priority to EP17827904.8A priority patent/EP3471490B1/fr
Publication of WO2018012833A1 publication Critical patent/WO2018012833A1/fr
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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method and apparatus for effectively transmitting and receiving control information for random access in a communication system.
  • a 5G communication system or a pre-5G communication system is called a system after a 4G network (Beyond 4G Network) or a system after an LTE system (Post LTE).
  • 5G communication systems are being considered for implementation in the ultra-high frequency (mmWave) band (eg, such as the 60 Gigabit (60 GHz) band).
  • FD-MIMO massive array multiple input / output
  • FD-MIMO massive array multiple input / output
  • FD-MIMO massive array multiple input / output
  • FD-MIMO massive array multiple input / output
  • FD-MIMO massive array multiple input / output
  • Array antenna, analog beam-forming, and large scale antenna techniques are discussed.
  • 5G communication systems have advanced small cells, advanced small cells, cloud radio access network (cloud RAN), ultra-dense network (ultra-dense network) , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation
  • cloud RAN cloud radio access network
  • D2D Device to Device communication
  • D2D Device to Device communication
  • CoMP Coordinated Multi-Points
  • Hybrid FSK and QAM Modulation FQAM and QAM Modulation
  • SWSC Slide Window Superposition Coding
  • ACM Advanced Coding Modulation
  • FBMC Fan Bank Multi Carrier
  • NOMA NOMA
  • non orthogonal multiple access non orthogonal multiple access
  • SCMA sparse code multiple access
  • IoT Internet of Things
  • IoE Internet of Everything
  • M2M machine to machine
  • MTC Machine Type Communication
  • IT intelligent Internet technology services can be provided that collect and analyze data generated from connected objects to create new value in human life.
  • IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliances, advanced medical services, etc. through convergence and complex of existing information technology (IT) technology and various industries. It can be applied to.
  • the random access operation of the terminal in the mobile communication system has a problem that can cause ambiguity in the operation of the random access message transmission.
  • the present invention proposes a method and apparatus for transmitting a message for random access, which can remove ambiguity of a random access related standard.
  • a communication method includes: receiving a random access message from a terminal; Determining a response message and downlink control information associated with the response message in response to the random access message; And transmitting the determined response message and the downlink control information, and specific information included in the downlink control information may be set to a preset value.
  • a communication method of a terminal includes: transmitting a message for random access to a base station; Receiving downlink control information corresponding to the message for random access from the base station; Receiving a response message by analyzing the downlink control information without considering a value of specific information included in the downlink control information; And transmitting a terminal identification message to the base station based on the response message, and specific information included in the terminal identification message may be set to a preset value.
  • a base station for communicating in a wireless communication system for communicating in a wireless communication system according to an embodiment of the present invention, the transceiver for transmitting and receiving a signal; And receiving a random access message from the terminal, determining a response message and downlink control information associated with the response message in response to the random access message, and transmitting the determined response message and downlink control information to the terminal.
  • the controller may include a controller, and specific information included in the downlink control information may be set to a preset value.
  • the transceiver for transmitting and receiving a signal; And transmitting a message for random access to the base station, receiving downlink control information corresponding to the message for random access from the base station, and not considering a value of specific information included in the downlink control information.
  • a controller configured to interpret the downlink control information, receive a response message, and transmit a terminal identification message to the base station based on the response message, wherein the specific information included in the terminal identification message is It may be set to a preset value.
  • FIG. 1 is a view showing a schematic structure of a communication system according to an embodiment of the present disclosure.
  • FIG. 2 is a diagram illustrating message transmission between a terminal and a base station for random access in an LTE system.
  • FIG. 3 is a flowchart illustrating a random access operation of a base station according to an embodiment of the present invention.
  • FIG. 4 is a flowchart illustrating a random access operation of a terminal according to an embodiment of the present invention.
  • FIG. 5 is a diagram illustrating message transmission between a terminal and a base station for random access according to an embodiment of the present invention.
  • FIG. 6 illustrates operations of a base station and a terminal when the terminal does not specify that the terminal does not expect content not transmitted in the UL grant of the RAR according to an embodiment of the present invention.
  • FIG. 7 illustrates operations of a base station and a terminal when the terminal specifies that content not transmitted in the UL grant of the RAR is not expected according to an embodiment of the present disclosure.
  • FIG. 8 is a diagram illustrating a terminal according to an embodiment of the present invention.
  • FIG. 9 is a diagram illustrating a base station according to an embodiment of the present invention.
  • each block of the flowchart illustrations and combinations of flowchart illustrations may be performed by computer program instructions. Since these computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, those instructions executed through the processor of the computer or other programmable data processing equipment may be described in flow chart block (s). It creates a means to perform the functions. These computer program instructions may be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular manner, and thus the computer usable or computer readable memory. It is also possible for the instructions stored in to produce an article of manufacture containing instruction means for performing the functions described in the flowchart block (s).
  • Computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operating steps may be performed on the computer or other programmable data processing equipment to create a computer-implemented process to create a computer or other programmable data. Instructions for performing the processing equipment may also provide steps for performing the functions described in the flowchart block (s).
  • each block may represent a portion of a module, segment, or code that includes one or more executable instructions for executing a specified logical function (s).
  • logical function e.g., a module, segment, or code that includes one or more executable instructions for executing a specified logical function (s).
  • the functions noted in the blocks may occur out of order.
  • the two blocks shown in succession may in fact be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending on the corresponding function.
  • ' ⁇ part' used in the present embodiment refers to software or a hardware component such as an FPGA or an ASIC, and ' ⁇ part' performs certain roles.
  • ' ⁇ ' is not meant to be limited to software or hardware.
  • ' ⁇ Portion' may be configured to be in an addressable storage medium or may be configured to play one or more processors.
  • ' ⁇ ' means components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, procedures, and the like. Subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables.
  • the functionality provided within the components and the 'parts' may be combined into a smaller number of components and the 'parts' or further separated into additional components and the 'parts'.
  • the components and ' ⁇ ' may be implemented to play one or more CPUs in the device or secure multimedia card.
  • FIG. 1 is a diagram illustrating a schematic structure of a mobile communication system according to an embodiment of the present disclosure.
  • a mobile communication system includes gNBs 100, 110, 120, 130, hereinafter referred to as base stations for operating a network.
  • the mobile communication system may be 5G.
  • the base stations 100, 110, 120, and 130 have coverages 105, 115, 125, and 135 that can each provide services.
  • the base stations 100, 110, 120, and 130 are connected to the terminals 140, 145, 150, and 155 through a wireless channel, and the terminals 140, 145 within the respective coverages 105, 115, 125, and 135. , 150, 155 may provide a wireless communication service.
  • the S-GW 170 is a device that provides a data bearer, and creates or releases a data bearer under the control of the MME 160.
  • the MME 160 is a device in charge of various control functions as well as mobility management functions for the terminals 140, 145, 150, and 155 and is connected to a plurality of base stations 100, 110, 120, and 130.
  • FIG. 2 is a diagram illustrating message transmission between a terminal and a base station for random access in an LTE system.
  • a signal may be transmitted and received between the terminal 200 and the base station 210, and the terminal 200 may perform a procedure for random access as described below to access the base station 210. Can be.
  • the terminal 200 may transmit a signal including a random access preamble to the base station 210 to access the base station 210.
  • the base station 210 may transmit a random access response to the terminal 210 in response to the received random access preamble. More specifically, the base station 210 indexes the random access preamble sequence detected by the network in response to the detected random access attempt, and temporary cell radio-network temporary TC-RNTI (temporary cell radio-network) to be used temporarily between the terminal 200 and the network.
  • a random access response including at least one of an identifier, a timing correction value calculated using a random access preamble, and scheduling information of a resource to be used for message transmission by the terminal 200 in a later step.
  • 'RAR' message may be transmitted to the terminal 200.
  • the RAR may be transmitted with down link control information (DCI) for receiving the RAR, and the DCI may be scrambled with the RA-RNTI.
  • DCI down link control information
  • DCI can be transmitted using a DCI format without HARQ-related information.
  • RAR can be transmitted using DCI format 1C.
  • Can transmit DCI format 1C is a simplified DCI format, has no information related to HARQ, contains only the minimum resource allocation information necessary to receive the RAR, and the terminal 200 corresponds to the corresponding RA-RNTI in a common search space. The scrambled DCI may be received. .
  • LTE uses a synchronous HARQ process for uplink transmission. That is, after the UL grant is transmitted, FDD performs uplink data transmission after 8 TTI (Transmission Time Interval), and in TDD, a subframe that performs uplink data transmission after UL grant according to TDD configuration is defined in the standard. It is decided. Accordingly, in all uplink data transmissions, for example, FDD, HARQ IDs are automatically assigned in units of 8TTIs, and in the case of the terminal 200 having synchronization with the base station 210, the UL 200 is implicit according to the TTI assigned to the UL grant. Recognizes the HARQ ID.
  • TTI Transmission Time Interval
  • the TTI received the UL grant will soon indicate the HARQ ID that can be allocated in the corresponding TTI. Therefore, the UL grant of LTE does not explicitly inform the HARQ ID. This also applies to message transmission for random access, and does not specify a HARQ ID value even when assigning a UL grant of message (Msg) 3 transmitted by the RAR.
  • Msg message
  • the terminal 200 may transmit Msg3 to the base station 210 based on the received RAR. More specifically, when the terminal 200 receives the RAR from the base station 210, the terminal 200 may transmit a necessary message to the base station 210 using the uplink resources allocated in the RAR.
  • the message may include identification information of the terminal.
  • HARQ may be performed through exchange of feedback information with a base station.
  • the base station 210 may transmit Msg4 to the terminal 200 based on the Msg3. More specifically, Msg4 may include information for contention-resolution, and Msg 4 may be transmitted on a downlink shared channel. As a result, contention of a plurality of terminals attempting to access the system using the same random access resource may be eliminated, and the terminal 200 may exchange information with the base station 210 by connecting to the base station 210.
  • the terminal may access the network using random access procedures 215, 220, 225, and 230 similar to those of the conventional LTE as illustrated in FIG. 2.
  • DL grant without HARQ transmission information may not exist as in DCI format 1C of LTE, and may be divided into B1 / B2 only. Since the DCI format B1 / B2 is a DL grant for data transmission, there is always HARQ ID and NDI (New Data Indicator) information for indicating the transmission / retransmission for HARQ support.
  • HARQ ID and NDI New Data Indicator
  • FIG. 3 is a flowchart illustrating a random access operation of a base station according to an embodiment of the present invention.
  • the base station may perform a random access operation through signal transmission and reception with a terminal.
  • the base station may receive a message including a random access preamble for random access from the terminal.
  • the random access preamble may be transmitted on the PRACH, and for this purpose, the base station may determine which time-frequency resource may be used for the random access preamble transmission to the UE in the cell (that is, Information about PRACH).
  • the base station may determine the information to be included in the RAR to be transmitted to the terminal and the DCI information for RAR transmission based on the random access preamble received from the terminal.
  • the RAR is an index of the random access preamble sequence detected by the network, a TC-RNTI to be temporarily used between the UE and the network, a timing correction value calculated based on the random access preamble, and a terminal for transmitting a message in a later step. It may include at least one of scheduling information of a resource to be used.
  • the DCI for transmitting the RAR may be DCI format B1 or DCI format B2, but is not limited thereto. It is apparent that a downlink DCI for RAR reception may be used.
  • the base station may set information related to HARQ included in the DCI to a specific value.
  • the information related to HARQ included in the DCI may be at least one of a HARQ ID, a new data indication (NDI), or a bit-mapping index for HARQ-ACK multiplexing.
  • the specific value may be zero.
  • the base station may transmit DCI and RAR in which the information related to the HARQ is set to a specific value to the terminal.
  • the DCI format for the RAR may be transmitted by scrambling with a random access radio-network temporary identifier (RA-RNTI), and the terminal that receives the DCI format scrambled with the RA-RNTI may be transmitted.
  • RAR may be obtained by interpreting DCI without considering information related to HARQ included in DCI.
  • the HARQ-related operation may not be performed in an RAR transmission step in which the identity of the UE is uncertain.
  • the terminal may interpret the DCI without considering information related to HARQ included in the received DCI.
  • the base station may receive Msg3 transmitted by the terminal based on the RAR.
  • the HARQ related information included in the Msg3 may be set to a specific value, and the specific value may be zero.
  • the Msg3 may include information on the identity of the terminal.
  • the base station may transmit Msg4 to the terminal based on Msg3 received from the terminal. More specifically, the Msg4 may include information for contention-resolving, and the Msg 4 may be transmitted on a downlink shared channel. As a result, contention of a plurality of terminals attempting to access the system using the same random access resource may be eliminated, and the terminal may exchange information by connecting to the base station.
  • the HARQ ID value may not be specified.
  • uplink transmission can operate as asynchronous HARQ like downlink transmission.
  • the UL Grant transmitted to the UE in DCI format A1 / A2 for uplink data transmission may be assigned a HARQ ID, and may also include NDI (New data indicator) related information indicating that new data is transmitted. This indicates that any HARQ ID may be assigned in the TTI in which the UL grant is received.
  • the terminal receiving the UL grant through Msg3 may acquire information related to the HARQ ID. It is not possible to define the operation accordingly.
  • FIG. 4 is a flowchart illustrating a random access operation of a terminal according to an exemplary embodiment of the present invention.
  • the UE may transmit a message including the random access preamble to the base station. More specifically, the signal including the random access preamble may be transmitted for a predetermined reason, and in one embodiment, the predetermined reason may be, for example, forming a radio link through an initial connection and resuming the radio link after a radio link failure. At least one of a location measurement based on uplink synchronization and a new cell and uplink measurement through shaping and handover.
  • the random access preamble may be transmitted on the PRACH, and for this purpose, the base station may determine which time-frequency resources may be used for the random access preamble transmission to the UE in the cell (ie, what resources). Information about whether or not this is a PRACH.
  • the terminal may receive a DCI from the base station in response to the message transmission including the random access preamble from the base station.
  • the UE may acquire the corresponding RAR in the downlink data channel by analyzing the DCI without considering information related to HARQ included in the DCI received from the base station.
  • the UE may acquire the corresponding RAR in the downlink data channel by analyzing the DCI without considering information related to HARQ included in the received DCI.
  • the information related to HARQ included in the DCI scrambled with the RA-RNTI may be at least one of a HARQ ID, a new data indication (NDI), or a bit-mapping index for HARQ-ACK multiplexing. .
  • the HARQ-related operation may not be performed on the downlink data channel corresponding to the DCI.
  • the UE acquires the RAR based on the DCI received from the base station, and interprets the HARQ-related information as a specific value in the UL grant related information for the transmission of Msg3 included in the obtained RAR.
  • the UE may transmit Msg3 by setting information related to HARQ included in Msg3 to a specific value based on the obtained RAR.
  • the terminal may transmit the Msg3 to the base station using the uplink resource allocated in the RAR, where Msg3 may include information about the identity of the terminal.
  • Msg4 is received from the base station in response to the transmission of Msg3, contention of a plurality of terminals attempting to access the system using the same random access resource may be eliminated, and the terminal may perform connection with the base station to exchange information thereafter. Can be.
  • FIG. 5 is a diagram illustrating message transmission between a terminal and a base station for random access according to an embodiment of the present invention.
  • the terminal 510 and the base station 500 may transmit and receive signals, and the terminal 510 may perform a procedure for random access as described below to access the base station 500. have.
  • the terminal 510 may transmit a signal including the random access preamble to the base station 500. More specifically, the signal including the random access preamble may be transmitted for a predetermined reason, and the predetermined reason may be, for example, to form a radio link through an initial connection, to form a radio link after a radio link failure, or to perform handover. It may be at least one of position measurement based on uplink synchronization and uplink measurement with a new cell.
  • a signal including the random access preamble may be transmitted on a PRACH.
  • the base station 500 transmits a random access preamble to a terminal 510 in a cell. Broadcasts information about which resources may be used (i.e., what resources are PRACH).
  • the base station 500 may receive a random access preamble from the terminal 510 and determine information to be included in the RAR to be transmitted to the terminal and DCI information for RAR transmission based on the received random access preamble.
  • the RAR is an index of the random access preamble sequence detected by the network, a TC-RNTI to be temporarily used between the terminal 510 and the network, a timing correction value calculated based on the random access preamble, and the terminal 510 at a later stage.
  • the DCI format for transmitting the RAR may be DCI format B1 or DCI format B2, but is not limited thereto, and it is apparent that downlink DCI for RAR reception may be used.
  • the base station 500 may set information related to HARQ included in the DCI to a specific value.
  • the information related to HARQ included in the DCI may be at least one of a HARQ ID, a new data indication (NDI), or a bit-mapping index for HARQ-ACK multiplexing.
  • the specific value may be zero.
  • the base station 500 may transmit a DCI format in which information related to HARQ is set to a specific value to the terminal 510 on the downlink control channel.
  • the base station 500 may transmit the RAR determined by the terminal 510 on the downlink data channel using the DCI format.
  • the DCI format for transmitting the RAR may be scrambled with a random access radio-network temporary identifier (RA-RNTI) and transmitted.
  • RA-RNTI random access radio-network temporary identifier
  • the terminal 510 may not perform the HARQ-related operation on the corresponding downlink data channel by interpreting the DCI without considering the HARQ-related information included in the received DCI.
  • the terminal 510 analyzes the DCI without considering information related to HARQ included in the received DCI and acquires a corresponding RAR in the downlink data channel. can do.
  • the HARQ-related operation in the RAR transmission step in which the identity of the UE is uncertain because the UE 510 does not consider the HARQ-related information included in the DCI transmitted by being fixed to a specific value and scrambled with RA-RNTI. May not be performed.
  • the UE 510 analyzes the DCI format to obtain a corresponding RAR in a downlink data channel, and sets information related to HARQ included in an UL grant for transmission of Msg3 included in the obtained RAR to a specific value.
  • the terminal 510 may transmit Msg3 by setting information related to HARQ to a specific value based on the UL grant included in the RAR received from the base station.
  • the Msg3 may be transmitted to a base station using an uplink resource allocated in the RAR, and in this case, the Msg3 may include information on the identity of the terminal.
  • the contention of a plurality of terminals attempting to access the system using the same random access resources can be eliminated, the terminal 510 is connected to the base station 500 Information can then be exchanged.
  • the RAR transmitted by the base station corresponding to the signal including the random access preamble received from the terminal is required for the DCI format as an UL grant for general uplink data, but is not included in the RAR.
  • the unnecessary information may include at least one of a beam switch indication, an uplink dual PCRS, an HARQ ID, and an NDI.
  • the unnecessary information may be deleted and transmitted in DCI format 1C, but in the mobile communication system according to an embodiment of the present invention, unnecessary information may be transmitted to the terminal without deleting the unnecessary information in the RAR.
  • FIG. 6 illustrates operations of a base station and a terminal when the terminal does not specify that the terminal does not expect content not transmitted in the UL grant of the RAR according to an embodiment of the present invention.
  • the base station 600 may perform a random access operation through signal transmission and reception with the terminal 610.
  • the terminal 610 may transmit a signal including the random access preamble to the base station 600. More specifically, the signal including the random access preamble may be transmitted for a predetermined reason, and the predetermined reason may be, for example, to form a radio link through an initial connection, to form a radio link after a radio link failure, or to perform handover. It may be at least one of position measurement based on uplink synchronization and uplink measurement with a new cell.
  • a signal including the random access preamble may be transmitted on a PRACH.
  • the base station 600 transmits a random access preamble to a terminal 610 in a cell. Broadcasts (i.e., what resources are PRACH).
  • the base station 600 receives a signal including a random access preamble from the terminal 610, and determines information to be included in the RAR to be transmitted to the terminal and DCI information for RAR transmission based on the received random access preamble.
  • the RAR is the index of the random access preamble sequence detected by the network, the TC-RNTI temporarily used between the terminal 610 and the network, a timing correction value calculated based on the random access preamble, and the terminal 610 at a later stage.
  • the DCI format for transmitting the RAR may be DCI format B1 or DCI format B2, but is not limited thereto, and it is apparent that downlink DCI for RAR reception may be used.
  • the base station 600 may set information related to HARQ included in the DCI to a specific value.
  • the information related to HARQ included in the DCI may be at least one of a HARQ ID, a new data indication (NDI), or a bit-mapping index for HARQ-ACK multiplexing.
  • the specific value may be zero.
  • the base station 600 may transmit a DCI format in which information related to HARQ is set to a specific value to the terminal 610 on the downlink control channel.
  • the DCI format for transmitting the RAR may be scrambled to RA-RNTI and transmitted.
  • the base station 600 may transmit the RAR determined by the terminal 610 on the downlink data channel using the DCI format.
  • the UE may acquire the corresponding RAR on the downlink data channel by analyzing the DCI without considering information related to HARQ included in the received DCI.
  • the terminal 610 interprets the DCI without considering information related to HARQ included in the received DCI and downlinks the corresponding RAR to the downlink data channel. Can be obtained from.
  • the information related to the HARQ of the DCI scrambled with the RA-RNTI may be at least one of a HARQ ID, a new data indication (NDI), or a bit-mapping index for HARQ-ACK multiplexing. have.
  • the HARQ-related operation may not be performed on the downlink data channel corresponding to the DCI.
  • the RAR is an index of the random access preamble sequence detected by the network, a TC-RNTI temporarily used between the terminal 610 and the network, a timing correction value calculated using a random access preamble, and
  • the terminal 610 may include at least one of scheduling information of resources to be used for message transmission.
  • the RAR may include information that is necessary for the DCI format as a UL grant for general uplink data but is unnecessary for the RAR.
  • the unnecessary information may include at least one of a beam switch indication, an uplink dual PCRS, an HARQ ID, and an NDI.
  • the UE may assume that the operation implicitly exists for information existing in the DCI format but not present in the UL grant of the RAR.
  • the terminal 610 is configured for the beam change (beam change) that may be present when receiving the RAR from the base station 600 for the beam switch indication of the information present in the DCI format but not in the UL grant of the RAR And implicitly prepare necessary actions in hardware. Also, in the embodiment, when the information indicating the beam change is received, the terminal may perform an operation for beam change based on the information, at least one of the obtained beam-related measurement information and the information indicating the beam change It is possible to select a beam to be changed based on.
  • the beam change beam change
  • the terminal 610 may reset software and hardware again if there is no beam switch instruction in the RAR.
  • the terminal 610 may transmit Msg3 by setting information related to HARQ to a specific value based on the UL grant of the RAR received from the base station 600.
  • the terminal may transmit the Msg3 to the base station using the uplink resources allocated in the RAR, where the Msg3 may include the identity of the terminal 610.
  • the terminal 610 receives the Msg4 from the base station in response to the transmission of the Msg3, the contention of a plurality of terminals attempting to access the system using the same random access resources can be eliminated, the terminal 610 is a base station 600 ) And then exchange information.
  • FIG. 7 illustrates operations of a base station and a terminal in the case where operation of a terminal as in the embodiment of the present specification is assumed for content not included in a UL grant of an RAR according to an embodiment of the present invention.
  • the base station 700 may perform a random access operation through signal transmission and reception with the terminal 710.
  • the terminal 710 may transmit a signal including the random access preamble to the base station 700. More specifically, the signal including the random access preamble may be transmitted for a predetermined reason, and the predetermined reason may be, for example, to form a radio link through an initial connection, to form a radio link after a radio link failure, or to perform handover. It may be one of position measurement based on uplink synchronization and uplink measurement with a new cell.
  • a signal including the random access preamble may be transmitted on a PRACH.
  • the base station 700 transmits a random access preamble to a terminal 710 in a cell. Broadcasts information about which resources may be used (i.e., what resources are PRACH).
  • the base station 700 receives a signal including a random access preamble from the terminal 710, and determines information to be included in the RAR to be transmitted to the terminal and DCI information for RAR transmission based on the received random access preamble.
  • the RAR is an index of the random access preamble sequence detected by the network, a TC-RNTI to be used temporarily between the terminal 710 and the network, a timing correction value calculated based on the random access preamble, and the terminal 710 at a later stage.
  • the DCI format for transmitting the RAR may be DCI format B1 or DCI format B2, but is not limited thereto, and it is apparent that downlink DCI for RAR reception may be used.
  • the base station 700 may set information related to HARQ included in the DCI to a specific value.
  • the information related to HARQ included in the DCI may be at least one of a HARQ ID, a new data indication (NDI), or a bit-mapping index for HARQ-ACK multiplexing.
  • the specific value may be zero.
  • the base station 700 may transmit a DCI format in which information related to HARQ is set to a specific value to the terminal 710 on the downlink control channel.
  • the DCI format for transmitting the RAR may be scrambled to RA-RNTI and transmitted.
  • the base station 700 may transmit the RAR determined by the terminal 710 on the downlink data channel using the DCI format.
  • the UE may acquire the corresponding RAR on the downlink data channel by analyzing the DCI without considering information related to HARQ included in the received DCI.
  • the terminal 710 analyzes the DCI without considering information related to HARQ included in the received DCI and downlinks the corresponding RAR to downlink data. Can be obtained from the channel.
  • the information related to HARQ of the DCI format may be at least one of a HARQ ID, a new data indication (NDI), or a bit-mapping index for HARQ-ACK multiplexing.
  • the RAR is an index of the random access preamble sequence detected by the network, a TC-RNTI temporarily used between the terminal 710 and the network, a timing correction value calculated using a random access preamble, and
  • the terminal 710 may include at least one of scheduling information of resources to be used for message transmission.
  • the RAR may include information that is necessary for the DCI format as a UL grant for general uplink data but is unnecessary for the RAR.
  • the unnecessary information may include at least one of a beam switch indication, an uplink dual PCRS, an HARQ ID, and an NDI.
  • the UE may be explicitly defined as not performing a corresponding operation on information present in the DCI format for the general uplink data but not present in the UL grant of the RAR.
  • the UE may be explicitly defined that the beam switch indication information does not exist in the received RAR with respect to the beam switch indication among information existing in the DCI format but not present in the UL grant of the RAR.
  • the terminal may prepare for transmission of Msg3 without additional setup of software and hardware related to the beam.
  • the terminal 710 may transmit Msg3 by setting information related to HARQ to a specific value based on the UL grant of the RAR received from the base station 700.
  • the terminal may transmit the Msg3 to the base station using the uplink resources allocated in the RAR, wherein the Msg3 may include the identity of the terminal.
  • Msg4 is received from the base station in response to the transmission of Msg3, contention of a plurality of terminals attempting to access the system using the same random access resource may be eliminated, and the terminal 710 performs a connection with the base station 700. Information can then be exchanged.
  • FIG. 8 is a diagram illustrating a terminal according to an embodiment of the present invention.
  • the terminal of the embodiment may include a transceiver 810, a terminal controller 815, and a storage 820.
  • the transceiver 810 may transmit and receive a signal with a base station and another entity. According to an embodiment of the present invention, the transceiver 810 transmits a signal including a random access preamble for random access to the base station and Msg3 corresponding to the RAR transmitted from the base station, and transmits the RAR and Msg4 from the base station. Can be received.
  • the storage unit 820 may store at least one of information related to a terminal or information transmitted and received through the transceiver 810. According to an embodiment of the present invention, the storage unit 820 may store information necessary for the HARQ operation.
  • the terminal controller 815 may be connected to the transceiver and the storage, control the operation of the terminal, and control the entire terminal to perform the operation related to the terminal described in the above embodiment.
  • the terminal controller 815 may include at least one processor.
  • FIG. 9 is a diagram illustrating a base station according to an embodiment of the present invention.
  • an embodiment of the terminal may include a transceiver 910, a base station controller 915, and a storage 920.
  • the transceiver 910 may transmit and receive a signal with a terminal and another entity. According to an embodiment of the present disclosure, the transceiver 910 receives Msg3 from the terminal in response to a signal including a random access preamble for random access from the terminal and an RAR transmitted to the terminal, and receives the RAR and Msg4 from the terminal. Can be sent to.
  • the storage unit 920 may store at least one of information related to a base station or information transmitted and received through the transceiver 910. According to an embodiment of the present invention, the storage unit 920 may store information required for the HARQ operation.
  • the base station controller 915 may be connected to the transceiver and the storage unit, control the operation of the base station, and control the entire base station so as to perform the operation related to the base station described in the above embodiment.
  • the base station controller 915 may include at least one processor.

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

Abstract

La présente invention concerne une technique de communication permettant d'amener un système de communication 5G à prendre en charge un débit de transmission de données élevé, supérieur à celui d'un système 4G, au moyen d'une technologie IdO, ainsi qu'un système associé. La présente invention peut être appliquée à un service intelligent (par exemple, les maisons intelligentes, les bâtiments intelligents, les villes intelligentes, les voitures intelligentes ou les voitures connectées, les soins de santé, l'enseignement numérique, la vente au détail intelligente, les services de sécurité et de sûreté) sur la base d'une technologie de communication 5G et une technologie associée à l'Internet des objets (IdO). La présente invention concerne un procédé et un dispositif qui permettent de transmettre ou de recevoir de manière efficace des informations de commande pour un accès aléatoire dans un système de communication. Selon divers modes de réalisation de la présente invention, les informations associées à l'accès aléatoire initial peuvent être efficacement transmises ou reçues.
PCT/KR2017/007367 2016-07-11 2017-07-10 Procédé de transmission efficace d'un message de commande pour accès aléatoire Ceased WO2018012833A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US16/316,208 US10887922B2 (en) 2016-07-11 2017-07-10 Method for effectively transmitting control message for random access
EP17827904.8A EP3471490B1 (fr) 2016-07-11 2017-07-10 Procédé de transmission efficace d'un message de commande pour accès aléatoire

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US201662360621P 2016-07-11 2016-07-11
US62/360,621 2016-07-11
KR10-2017-0052805 2017-04-25
KR1020170052805A KR102317012B1 (ko) 2016-07-11 2017-04-25 효과적인 랜덤 액세스를 위한 제어 메시지 전송 방법

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KR20130087308A (ko) * 2012-01-27 2013-08-06 주식회사 팬택 무선 통신 시스템에서 랜덤 액세스의 수행장치 및 방법
KR20150052354A (ko) * 2009-04-23 2015-05-13 인터디지탈 패튼 홀딩스, 인크 멀티캐리어 무선 통신에서의 임의 접속을 위한 방법 및 장치
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