WO2021062639A1 - Procédé et dispositif d'accès aléatoire et système de communication - Google Patents

Procédé et dispositif d'accès aléatoire et système de communication Download PDF

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Publication number
WO2021062639A1
WO2021062639A1 PCT/CN2019/109476 CN2019109476W WO2021062639A1 WO 2021062639 A1 WO2021062639 A1 WO 2021062639A1 CN 2019109476 W CN2019109476 W CN 2019109476W WO 2021062639 A1 WO2021062639 A1 WO 2021062639A1
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random access
sub
data unit
protocol data
message
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PCT/CN2019/109476
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English (en)
Chinese (zh)
Inventor
路杨
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富士通株式会社
路杨
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Priority to PCT/CN2019/109476 priority Critical patent/WO2021062639A1/fr
Publication of WO2021062639A1 publication Critical patent/WO2021062639A1/fr

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    • 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 embodiments of the present application relate to the field of wireless communication technology.
  • the random access process is a very critical step in mobile communication technology.
  • FIG. 1(a) is a flowchart of the existing four-step contention-based random access (CBRA, Contention-Based Random Access) process.
  • CBRA Contention-Based Random Access
  • the terminal device selects the CBRA preamble (preamble), and sends the preamble through Msg1 in the contention-based random access opportunity (RO, Random access Occasion) pre-configured by the system;
  • the network device will send Msg2 after receiving the preamble.
  • the random access response authorizes the terminal device that sends the preamble a dedicated uplink PUSCH resource and allocates a temporary cell radio network temporary identifier ( CRNTI), indicating the uplink advance of the physical uplink shared channel (PUSCH); in step 103, the terminal device sends the Msg3 carrying signaling or data on the PUSCH resource; in step 104, the network device sends the terminal device the Msg3 The contention resolution signaling Msg4.
  • CRNTI temporary cell radio network temporary identifier
  • FIG. 1(b) is a flow chart of the existing two-step contention-based random access (CBRA, Contention-Based Random Access) process.
  • CBRA Contention-Based Random Access
  • the terminal device sends MsgA.
  • MsgA contains the CBRA preamble and data part (payload).
  • the terminal device sends the MsgA preamble in the competing RO and competes
  • the signaling or service data of MsgA is sent in the physical uplink shared channel (PUSCH) resource.
  • the network device sends MsgB after receiving MsgA, thereby sending a random access response and a contention resolution message to the terminal device.
  • PUSCH physical uplink shared channel
  • the receiving window of the random access response needs to be extended.
  • the network device needs to perform the pre-session monitoring (LBT) before sending the random access response. If the LBT fails, the random access response cannot be sent.
  • LBT pre-session monitoring
  • the network device provides more sending opportunities, and the random access response receiving window can be extended to 20-80ms.
  • the random access response reception window also needs to be extended to more than 20ms.
  • the radio network temporary identification (RNTI) of the scrambled random access response physical downlink public control channel (PDCCH) is related to the carrier, time and frequency of the physical random access channel (PRACH) transmission opportunity that sends the preamble.
  • the RNTI is only in one system frame (For example, 10ms) is unique.
  • the inventor of this application found that if the random access response window is greater than 10ms, different PRACH transmission opportunities within a random access response window will correspond to the same RNTI, resulting in different PRACH transmission opportunities for the terminal equipment that sends the preamble at random reception.
  • the access response causes confusion. Therefore, the existing random access response receiving window is difficult to support the random access of the unlicensed frequency band or the response receiving window length of the two-step random access; in addition, the existing random access response does not Provide random access response information required for random access in unlicensed frequency bands or two-step random access, and cannot support random access in unlicensed frequency bands, two-step random access, or two-step random access in unlicensed frequency bands process.
  • the embodiments of the application provide a random access method, device, and communication system.
  • the random access response includes frame number indication information, and the information is used for Instruct the terminal device to send the wireless frame of Msg1 or MsgA, so as to avoid the confusion of the terminal device that sends the preamble on different physical random access channel (PRACH) opportunities when receiving the random access response.
  • PRACH physical random access channel
  • the method can be applied to scenarios such as random access in an unlicensed frequency band, two-step random access, or two-step random access initiated in an unlicensed frequency band.
  • a random access method is provided, which is applied to a terminal device.
  • the method includes: sending a first message (MsgA) of a two-step random access procedure to a network device, or, in Africa
  • the second message (Msg1) of the random access process is sent in the authorized frequency band; the random access response sent by the network device is received; the physical downlink public control channel (PDCCH) of the random access response is addressed to the wireless network temporarily If the identification and the frame number indication information carried in the random access response matches the radio frame for sending the first message or the radio frame for sending the second message, the random access response is processed.
  • MsgA first message
  • PDCCH physical downlink public control channel
  • a random access method is provided, which is applied to a network device, and the method includes: receiving a first message (MsgA) of a two-step random access process, or, in an unlicensed frequency band Receive the second message (Msg1) of the random access procedure; send a random access response, wherein the physical downlink public control channel (PDCCH) of the random access response is addressed to the wireless network temporary identity, and the random access
  • the frame number indication information carried in the response matches the radio frame for sending the first message or the radio frame for sending the second message.
  • a random access device which is applied to a terminal device, and the device executes the random access method of the first aspect of the embodiments of the present application.
  • a random access device which is applied to a network device, and the device executes the random access method of the second aspect of the embodiments of the present application.
  • a terminal device having the random access apparatus described in the third aspect of the embodiments of the present application.
  • a network device having the random access apparatus described in the fourth aspect of the embodiments of the present application.
  • a communication system having the terminal device described in the sixth aspect of the embodiments of the present application and the network device described in the seventh aspect.
  • a computer-readable program wherein when the program is executed in a random access device or terminal device, the program causes the random access device or terminal device to execute The random access method in the first aspect of the embodiments of the present application.
  • a storage medium storing a computer-readable program, wherein the computer-readable program enables the random access apparatus or terminal device to execute the first aspect of the embodiments of the present application Random access method.
  • a computer-readable program wherein when the program is executed in a random access apparatus or network equipment, the program causes the random access apparatus or network equipment to execute The random access method described in the second aspect of the embodiments of the present application.
  • a storage medium storing a computer-readable program, wherein the computer-readable program enables the random access apparatus or network device to execute the method described in the second aspect of the embodiments of the present application.
  • the random access response includes frame number indication information, which is used to instruct the terminal device to send Msg1 or MsgA wireless Frames, thereby avoiding confusion when terminal devices that send preambles on different physical random access channels (PRACH) opportunities receive random access responses.
  • PRACH physical random access channels
  • Figure 1 (a) is a flow chart of the existing four-step contention-based random access process
  • Figure 1(b) is a flow chart of the existing two-step contention-based random access process
  • Fig. 2 is a schematic diagram of a communication system according to an embodiment of the present application.
  • FIG. 3 is a schematic diagram of the random access method in the first aspect of the embodiments of the present application.
  • FIG. 4 is a schematic diagram of a method for processing a random access response in operation 303;
  • FIG. 5 is another schematic diagram of the method for processing random access response in operation 303;
  • FIG. 6 is a schematic diagram of the random access method of Example 1 in the first aspect of the embodiments of the present application.
  • FIG. 7 is a schematic diagram of the random access method of Example 2 in the first aspect of the embodiments of the present application.
  • FIG. 8 is a schematic diagram of the random access method of Example 3 in the first aspect of the embodiments of the present application.
  • FIG. 9 is a schematic diagram showing that the frame number indication information is located in the preset position in the protocol data unit of the random access response;
  • FIG. 10A is a schematic diagram showing that the frame number indication information is located in the preset position in the sub-protocol data unit;
  • FIG. 10B is a schematic diagram showing that the frame number indication information is located in the preset position in the sub-protocol data unit;
  • FIG. 11 is a schematic diagram showing that the frame number indication information is located in a predetermined sub-protocol data unit and a preset position in the sub-protocol data unit;
  • FIG. 12 is a schematic diagram of using the identifier T to indicate various types of sub-protocol data units
  • FIG. 13 is another schematic diagram of using the identifier T to indicate various types of sub-protocol data units
  • FIG. 14 is a schematic diagram of the header of the contention resolution subPDU containing the SRB indication information and the header of the subPDU containing the RRC message;
  • FIG. 15 is another schematic diagram of using the identifier T to indicate various types of sub-protocol data units
  • FIG. 16 is another schematic diagram of using the identifier T to indicate various types of sub-protocol data units
  • FIG. 17 is a schematic diagram of the random access method in the second aspect of the embodiments of the present application.
  • FIG. 18 is a schematic diagram of the random access device in the third aspect of the embodiments of the present application.
  • FIG. 19 is a schematic diagram of the random access device in the fourth aspect of the embodiments of the present application.
  • 20 is a schematic block diagram of the system configuration of the terminal device in the fifth aspect of the embodiments of the present application.
  • FIG. 21 is a schematic diagram of a structure of a network device in the sixth aspect of the embodiments of the present application.
  • the terms “first”, “second”, etc. are used to distinguish different elements from the terms, but they do not indicate the spatial arrangement or chronological order of these elements. These elements should not be used by these terms. Limited.
  • the term “and/or” includes any and all combinations of one or more of the associated listed terms.
  • the terms “comprising”, “including”, “having” and the like refer to the existence of the stated features, elements, elements or components, but do not exclude the presence or addition of one or more other features, elements, elements or components.
  • the term "communication network” or “wireless communication network” can refer to a network that meets any of the following communication standards, such as Long Term Evolution (LTE), and Enhanced Long Term Evolution (LTE-A, LTE-A). Advanced), Wideband Code Division Multiple Access (WCDMA, Wideband Code Division Multiple Access), High-Speed Packet Access (HSPA, High-Speed Packet Access), etc.
  • LTE Long Term Evolution
  • LTE-A Enhanced Long Term Evolution
  • LTE-A LTE-A
  • Advanced Wideband Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • High-Speed Packet Access High-Speed Packet Access
  • HSPA High-Speed Packet Access
  • the communication between devices in the communication system can be carried out according to any stage of communication protocol, for example, it can include but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and future 5G, New Radio (NR, New Radio), etc., and/or other currently known or future communication protocols.
  • Network device refers to, for example, a device in a communication system that connects a terminal device to a communication network and provides services for the terminal device.
  • Network equipment may include but not limited to the following equipment: base station (BS, Base Station), access point (AP, Access Point), transmission and reception point (TRP, Transmission Reception Point), broadcast transmitter, mobile management entity (MME, Mobile Management Entity), gateway, server, radio network controller (RNC, Radio Network Controller), base station controller (BSC, Base Station Controller), etc.
  • the base station may include but is not limited to: Node B (NodeB or NB), evolved Node B (eNodeB or eNB), 5G base station (gNB), etc., and may also include remote radio head (RRH, Remote Radio Head) , Remote Radio Unit (RRU, Remote Radio Unit), relay (relay), or low-power node (such as femto, pico, etc.).
  • NodeB Node B
  • eNodeB or eNB evolved Node B
  • gNB 5G base station
  • RRH Remote Radio Head
  • RRU Remote Radio Unit
  • relay relay
  • low-power node such as femto, pico, etc.
  • base station can include some or all of their functions, and each base station can provide communication coverage for a specific geographic area.
  • the term "cell” may refer to a base station and/or its coverage area, depending on the context in which the term is used.
  • the term "User Equipment” (UE, User Equipment) or “Terminal Equipment” (TE, Terminal Equipment), for example, refers to equipment that accesses a communication network through a network device and receives network services.
  • the user equipment may be fixed or mobile, and may also be called a mobile station (MS, Mobile Station), terminal, subscriber station (SS, Subscriber Station), access terminal (AT, Access Terminal), station, etc.
  • user equipment may include, but is not limited to, the following devices: Cellular Phone, Personal Digital Assistant (PDA, Personal Digital Assistant), wireless modem, wireless communication device, handheld device, machine-type communication device, laptop computer, Cordless phones, smart phones, smart watches, digital cameras, etc.
  • PDA Personal Digital Assistant
  • wireless modem wireless communication device
  • handheld device machine-type communication device
  • laptop computer machine-type communication device
  • Cordless phones smart phones
  • smart watches digital cameras, etc.
  • user equipment may also be a machine or device that performs monitoring or measurement.
  • it may include, but is not limited to: Machine Type Communication (MTC) terminals, In-vehicle communication terminals, device to device (D2D, Device to Device) terminals, machine to machine (M2M, Machine to Machine) terminals, etc.
  • MTC Machine Type Communication
  • D2D Device to Device
  • M2M Machine to Machine
  • FIG. 2 is a schematic diagram of a communication system according to an embodiment of the present application, which schematically illustrates a case where terminal equipment and network equipment are taken as an example.
  • the communication system 200 may include a network equipment 201 and a terminal equipment 202 (for simple For the sake of illustration, Figure 2 only takes one terminal device as an example for illustration).
  • eMBB enhanced mobile broadband
  • mMTC large-scale machine type communication
  • URLLC Ultra-Reliable and Low- Latency Communication
  • the terminal device 202 can send data to the network device 201, for example, using an unauthorized transmission mode.
  • the network device 201 may receive data sent by one or more terminal devices 202, and feedback information (for example, acknowledgement ACK/non-acknowledgement NACK) information to the terminal device 202, and the terminal device 202 may confirm the end of the transmission process according to the feedback information, or may also re-enter the transmission process. Perform new data transmission, or data retransmission can be performed.
  • feedback information for example, acknowledgement ACK/non-acknowledgement NACK
  • the following description takes the network device in the communication system as the receiving end and the terminal device as the sending end as an example for description, but the present application is not limited to this, and the sending end and/or the receiving end may also be other devices.
  • this application is not only applicable to uplink unauthorized transmission between network equipment and terminal equipment, but also applicable to side link unauthorized transmission between two terminal equipment.
  • the first aspect of the embodiments of the present application relates to a random access method, which is applied to a terminal device, such as the terminal device 202.
  • FIG. 3 is a schematic diagram of the random access method in the first aspect of the embodiments of the present application. As shown in FIG. 3, the random access method may include:
  • Operation 301 Send the first message MsgA of the two-step random access procedure to the network device, or send the second message Msg1 of the random access procedure in the unlicensed frequency band;
  • Operation 302 Receive a random access response sent by the network device.
  • Operation 303 When the physical downlink common control channel (PDCCH) of the random access response is addressed to the radio network temporary identity (RNTI), and the frame number indication information carried in the random access response matches the radio frame or the radio frame sending the first message In the case of transmitting the wireless frame of the second message, the random access response is processed.
  • PDCCH physical downlink common control channel
  • RNTI radio network temporary identity
  • the random access response includes frame number indication information, and the frame number indication information is associated with sending Msg1 or MsgA.
  • the wireless frames match, it indicates that the random access response received by the terminal device is a response to the Msg1 or MsgA sent by the terminal device.
  • PRACH physical random access channel
  • the random access response is included in the downlink transmission of the physical downlink common control channel (PDCCH) scrambled by the radio network temporary identity (RNTI).
  • the radio network temporary identifier is the first wireless network temporary identifier
  • the first wireless network temporary identifier is, for example, the random access radio network temporary identifier (RA- RNTI)
  • the radio network temporary identifier is the second wireless network temporary identifier
  • the second wireless network temporary identifier is, for example, the message B wireless network temporary identifier (MsgB- RNTI).
  • the frame number indication information matches the radio frame for sending the first message Msg1 or the radio frame for sending the second message MsgA refers to:
  • the frame number indication information (S) is the low-order bit of the system frame number (SFN) of the radio frame sending the first message or the second message.
  • the low-order bit is the Least Significant Bits (LSB) (for example, 2 or 3 bits).
  • the frame number indication information (S) is the number of radio frames included in the system frame number (SFN) of the radio frame sending the first message or the second message versus the length of the random access response receiving window (ra-ResponseWindow)
  • the modulus value of, that is, S SFN mod(CEIL(ra-ResponseWindow/10)).
  • the case where the second message Msg1 of the random access procedure is sent in the unlicensed frequency band and the case where the first message MsgA of the two-step random access procedure is sent are processed
  • the random access response method can be different.
  • Fig. 4 is a schematic diagram of the method for processing random access response in operation 303, showing the method for processing random access response in the case where the second message Msg1 of the random access procedure is transmitted in an unlicensed frequency band.
  • the method for processing random access response includes:
  • Operation 401 If there is a random access preamble identifier (RAP ID) in a medium access control subprotocol data unit (MAC subPDU) in the random access response that matches the preamble of the second message (Msg1), it is determined to be successful A random access response was received.
  • RAP ID random access preamble identifier
  • MAC subPDU medium access control subprotocol data unit
  • the preamble of the second message Msg1 may be a competing random access preamble or a non-competing random access preamble.
  • the method for processing a random access response may further include after operation 401:
  • Operation 402 Process the uplink resource grant included in the MAC subPDU, and indicate the uplink resource grant to the physical layer of the terminal device 202, where the uplink resource grant includes uplink data (for example, the first Three message Msg3) channel access type and/or channel access level (Channel Access Priority Class, CAPC).
  • uplink data for example, the first Three message Msg3 channel access type and/or channel access level (Channel Access Priority Class, CAPC).
  • CAPC Channel Access Priority Class
  • the terminal device can share the channel obtained by the network device and simplify the terminal device. The process of channel monitoring when sending uplink data.
  • CAPC Channel Access Priority Class
  • the method for processing a random access response may further include:
  • Operation 403 If the random access response contains a media access control sub-protocol data unit (MAC subPDU) containing backoff indication information, set the backoff value of the second message (msg1) according to the backoff indication information; otherwise, set the backoff value of the second message (msg1); otherwise, set the backoff value of the second message (msg1) according to the backoff indication information.
  • the backoff value of the second message (msg1) is set to a predetermined value, and the predetermined value is 0, for example.
  • the method for processing a random access response may further include at least one of the following operations:
  • Operation 404 processing the timing advance command (TAC) included in the random access response (RAR) in the MAC subPDU;
  • TAC timing advance command
  • RAR random access response
  • Operation 405 Notify the bottom layer of the terminal device 202 of the target received power (preambleReceivedTargetPower) and the target received power climb value of the second message (msg1).
  • the target received power climb value (PREAMBLE_POWER_RAMPING_COUNTER-1) ⁇ PREAMBLE_POWER_RAMPING_STEP,
  • PREAMBLE_POWER_RAMPING_COUNTER represents the preamble power climb count
  • PREAMBLE_POWER_RAMPING_STEP represents the preamble power climb step length
  • Operation 406 If the preamble of the second message (msg1) belongs to the preamble of non-contention random access, the terminal device 202 determines that the random access process is completed;
  • Operation 407 If the preamble of the second message (msg1) belongs to the preamble for competing random access, the terminal device 202 sets a temporary cell radio network temporary identifier (C-RNTI) according to the temporary cell radio network temporary identifier (TC_RNTI) contained in the RAR in the subPDU ) Value, Msg3 is sent on the uplink authorized resource.
  • C-RNTI temporary cell radio network temporary identifier
  • TC_RNTI temporary cell radio network temporary identifier
  • the terminal device 202 if the terminal device 202 successfully receives the random access response for the first time in the random access process, the terminal device 202 obtains the media access control sub-protocol data unit (MAC) of Msg3 from the multiplexing and assembling entity. PDU) and store it in the msg3 buffer, and send Msg3 on the uplink authorized resource.
  • MAC media access control sub-protocol data unit
  • FIG. 5 is another schematic diagram of the method for processing a random access response in operation 303, showing a method for processing a random access response in a case where the first message MsgA is sent in a two-step random access process.
  • the method for processing random access response includes:
  • Operation 501 In the case that the first message MsgA of the random access process is sent, if there is a random access preamble identifier (RAP ID) in a medium access control subprotocol data unit (MAC subPDU) in the random access response ) Matches the preamble of the first message MsgA, or if the contention resolution identifier in the media access control sub-protocol data unit in the random access response matches the common control channel service data in the first message Unit (CCCH SDU), the terminal device 202 determines that the message B (MsgB) is successfully received.
  • RAP ID random access preamble identifier
  • MAC subPDU medium access control subprotocol data unit
  • the terminal device may receive two types of messages B (MsgB) sent by the network device: fallback random access response (fallbackRAR) and successful random access response (successRAR).
  • the fallbackRAR is sent when the network device cannot successfully demodulate the data part of the first message (MsgA), and the terminal device can fallback to the 4-step CBRA according to the fallbackRAR.
  • fallbackRAR includes: random access preamble identifier (RAP ID), uplink resource grant of the third message (Msg3), timing advance command (TAC), and temporary cell radio network temporary identifier (TC_RNTI).
  • successRAR is sent when the network device can successfully demodulate the data part of the first message (MsgA), and the terminal device that successfully receives the successRAR can determine that the 2-step CBRA has been successfully completed.
  • successRAR includes: contention resolution identification, cell network temporary identification (C-RNTI) and transmission timing advance command (TAC).
  • the terminal device sends the first message MsgA of the random access procedure, if a MAC subPDU in the random access response contains fallbackRAR and the RAP ID in the MAC subPDU matches the preamble of the first message (MsgA) Or, if one MAC subPDU in the random access response contains successRAR and the contention resolution identifier in the MAC subPDU matches the common control channel service data unit (CCCH SDU) in the first message (MsgA), the terminal The device 202 determines that the message B (MsgB) is successfully received.
  • CCCH SDU common control channel service data unit
  • the method for processing a random access response may further include after operation 501:
  • Operation 502 In the random access response, there is a case where the random access preamble identifier (RAP ID) in the medium access control subprotocol data unit (MAC subPDU) matches the preamble of the first message (MsgA)
  • RAP ID random access preamble identifier
  • MAC subPDU medium access control subprotocol data unit
  • the terminal device 202 informs the bottom layer of the terminal device: the target received power and target of the preamble of the first message (MsgA) The received power ramp-up value, and/or the target received power and target received power ramp-up value of the physical uplink shared channel (MsgA PUSCH) of the first message.
  • the bottom layer of the terminal device 202 can determine the transmission power of subsequent uplink data according to the parameters notified in operation 502, such as the transmission power of the third message Msg3.
  • the method for processing a random access response may further include:
  • Operation 503 Process the uplink resource grant included in the random access response in the medium access control sub-protocol data unit (MAC subPDU), and indicate the uplink resource grant to the physical layer.
  • the physical layer can use the uplink authorization to send uplink data, such as the third message Msg3.
  • the method for processing a random access response may further include:
  • Operation 504 If the preamble of the first message (MsgA) belongs to the preamble of competing random access, the random access response including the random access preamble identifier is successfully received for the first time in the random access process.
  • the media access control protocol data unit (MAC PDU) of the third message Msg3 is obtained from the buffer of the first message MsgA and stored in the third message (Msg3) buffer, and on the uplink authorized resource Send the third message (Msg3).
  • MAC PDU media access control protocol data unit
  • the terminal device when the network device fails to receive the MsgA data, the terminal device can retransmit the data part of the MsgA through the Msg3 of the 4-step CBRA according to the instruction of the fallbackRAR.
  • the method for processing a random access response may further include:
  • the method for processing a random access response may further include:
  • Operation 506 In the case that a contention resolution identifier included in a media access control sub-protocol data unit in the random access response matches the common control channel service data unit (CCCH SDU) in the first message, according to the media access
  • the cell radio network temporary identifier (C-RNTI) included in the access control sub-protocol data unit sets the C-RNTI value of the terminal device 202 and determines that the random access process is completed.
  • the method for processing a random access response may further include:
  • Operation 507 In the case that a contention resolution identifier included in a medium access control sub-protocol data unit in the random access response matches the common control channel service data unit (CCCH SDU) in the first message, if The media access control sub-protocol data unit after the media access control sub-protocol data unit includes a signaling radio bearer (SRB) service data unit (SDU), and the SRB SDU is submitted to a higher layer for processing.
  • SRB signaling radio bearer
  • the method for processing a random access response may further include:
  • the method for processing a random access response may further include:
  • Operation 509 In the case where the first message (MsgA) of the random access procedure is sent, if the random access response contains a media access control sub-protocol data unit (MAC subPDU) containing backoff indication information, according to The back-off indication information sets the back-off value of the first message (MsgA), otherwise, the back-off value of the first message (MsgA) is set to a predetermined value, for example, the predetermined value is 0.
  • MAC subPDU media access control sub-protocol data unit
  • operations 502 to 505 correspond to a situation in which a random access preamble identifier in a media access control sub-protocol data unit matches the preamble of the first message in the random access response
  • Operation 504 corresponds to the case where the preamble of MsgA belongs to contention random access, that is, the case of falling back from two-step random access to four-step random access and then sending the third message Msg3
  • operation 505 corresponds to the case where the preamble of MsgA belongs to In the case of non-competition random access
  • operation 506 and operation 507 correspond to the case in which a media access control sub-protocol data unit contains a contention resolution identifier in the random access response.
  • Example 1 illustrates the processing of receiving a random access response by the terminal device 202 when random access is initiated in an unlicensed frequency band.
  • FIG. 6 is a schematic diagram of the random access method of Example 1 in the first aspect of the embodiments of the present application.
  • Operation 601 After the terminal device sends the Msg1 in the random access process in the unlicensed frequency band, the terminal device 202 receives the random access response sent by the network device 201, and the sent Msg1 preamble includes the competitive random access preamble and/or the non-competitive random access preamble. Enter preamble;
  • the frame number indication information matches the wireless frame for sending Msg1 means: the frame number indication information (S) is the least significant bit (LSB, Least Significant Bits) of the system frame number (SFN) for sending Msg1, or the frame number
  • the terminal device 202 when the terminal device 202 receives the downlink transmission of the PDCCH scrambled by RA-RNTI and the frame number indication information contained in the random access response in the downlink transmission matches the radio frame for sending Msg1, the terminal device 202 processes the random access response.
  • the terminal device 202 processing the random access response may include the following operations:
  • the terminal device determines that the random access response is successfully received.
  • Operation 6024 Notify the bottom layer of Msg1's target received power preambleReceivedTargetPower and target received power ramp-up value (PREAMBLE_POWER_RAMPING_COUNTER-1) ⁇ PREAMBLE_POWER_RAMPING_STEP; the bottom layer of these parameters is used to calculate the transmission power of uplink data, such as the transmission power of Msg3.
  • Operation 6025 Process the uplink resource grant included in the RAR in the MAC subPDU, and indicate the uplink resource grant to the physical layer, where the channel access type and/or channel access level (CAPC) of the uplink data included in the uplink resource grant.
  • the uplink resource authorization includes 2 bits of information to indicate four types of uplink data channel access LBT types: Cat1, Cat2/16us, Cat2/25us or Cat4.
  • cat1 When the terminal device sends uplink data, it can send immediately without monitoring the channel status.
  • the gap between the end of the gNB downlink transmission and the start of the uplink data transmission is less than 16us, it indicates the cat1 type LBT; cat2/16us: the terminal device Before sending uplink data, it is necessary to monitor the channel status within 16us.
  • the gNB indicates the cat2/16us type LBT; cat2/25us: the terminal device sends the uplink It is necessary to monitor the channel condition within 25us before data.
  • the cat2/25us type LBT is indicated;
  • Cat4 the terminal device needs to send the uplink data before Do Cat4 type LBT, for example, when the gap between the end of the gNB downlink transmission and the start of the uplink data transmission is greater than N us, the Cat4 type LBT is indicated.
  • the terminal device determines that the random access process is completed; if the preamble belongs to the preamble of competitive random access, set the C-RNTI value according to the TC_RNTI contained in the subPDU, and perform the uplink Msg3 is sent on the authorized resource; if the random access response is successfully received for the first time in the random access process, the MAC PDU of Msg3 is obtained from the multiplexing and assembling entity and stored in the Msg3 buffer, and Msg3 is sent on the uplink authorized resource.
  • the second example illustrates the processing of receiving the random access response when the terminal device 202 initiates two-step random access in the authorized frequency band.
  • FIG. 7 is a schematic diagram of the random access method of Example 2 in the first aspect of the embodiments of the present application.
  • the random access method includes:
  • Operation 702 If the terminal device 202 receives the downlink transmission of the PDCCH scrambled by the MsgB-RNTI and the frame number indication information contained in the random access response in the downlink transmission matches the radio frame for sending the MsgA, the terminal device 202 processes the random access Into the response.
  • the frame number indication information matches the wireless frame for sending MsgA means: the frame number indication information (S) is the least significant bits (LSB, Least Significant Bits) of the system frame number (SFN) for sending MsgA, or the frame number
  • the terminal device 202 when the terminal device 202 receives the downlink transmission of the PDCCH scrambled by the MsgB-RNTI and the frame number indication information contained in the random access response in the downlink transmission matches the radio frame for sending the MsgA, the terminal device 202 processes the random access response.
  • the terminal device 202 processing the random access response includes:
  • Operation 7022 If the RAPID in a MAC subPDU included in the random access response matches the preamble of the MsgA, or if the contention resolution identifier in a MAC subPDU included in the random access response matches the CCCH SDU included in the MsgA, The terminal device 202 determines that the message B (MsgB) is successfully received, and performs the following operations;
  • Operation 7023 Process the TAC contained in the RAR in the MAC subPDU: If the MsgA preamble belongs to the non-contention random access preamble, or the MsgA preamble belongs to the contention random access preamble and the TA timer of the time advance group (TAG) of the cell to which it belongs is not running, The terminal device 202 starts or restarts the TA timer of the TAG to which the cell belongs, and applies the value of the TAC field to the TAG to which the cell belongs;
  • TAG time advance group
  • Operation 7024a For the case where the RAR in the MAC subPDU contains RAPID, the following operations are available:
  • Operation (1) Notify the target received power preambleReceivedTargetPower of the bottom layer MsgA preamble of the terminal device 202 and the target received power climb value of the MsgA preamble, and/or notify the bottom layer MsgA PUSCH target received power and the target received power climb value.
  • Operation (2) Process the uplink resource grant included in the RAR in the MAC subPDU, and indicate the uplink resource grant to the physical layer for subsequent uplink data transmission, for example, for Msg3 transmission.
  • the preamble belongs to non-competitive or competitive random access preamble. There are two operations as follows:
  • the terminal device determines that the random access process is completed
  • the terminal device subsequently sends Msg3: MAC sets the value of C-RNTI according to the TC_RNTI field contained in the RAR in the subPDU, and sends Msg3 on the uplink authorized resource. ; If it is the first time that the random access response containing RAPID is successfully received in the random access process, the MAC PDU of Msg3 is obtained from the MsgA cache and stored in the Msg3 cache, and Msg3 is sent on the uplink authorized resource.
  • the terminal device 202 sets the value of C-RNTI according to the C_RNTI field contained in the RAR in the MAC subPDU, and the terminal device 202 determines that the random access process is complete; in addition, if the media access
  • the media access control sub-protocol data unit after the control sub-protocol data unit includes a signaling radio bearer (SRB) service data unit (SDU), and the SRB SDU is submitted to the higher layer for processing.
  • SRB signaling radio bearer
  • Example 3 illustrates the processing of receiving a random access response when the terminal device 202 initiates a two-step random access in an unlicensed frequency band.
  • the processing procedure of the terminal device 202 is similar to that of the second example, but because the random access is initiated in an unlicensed frequency band, the network device 201 will include the channel access information of Msg3 in the uplink resource grant of the random access response.
  • FIG. 8 is a schematic diagram of the random access method of Example 3 in the first aspect of the embodiments of the present application. As shown in Figure 8, the method includes:
  • Operation 801 After sending the MsgA for two-step random access in the unlicensed frequency band, the terminal device 202 receives the random access response sent by the network device 201;
  • Operation 802 If the terminal device 202 receives the downlink transmission of the PDCCH scrambled by the MsgB-RNTI and the frame number indication information contained in the random access response in the downlink transmission matches the radio frame for sending the MsgA, the terminal device 202 processes the random access Into the response.
  • the meaning that the frame number indication information included in the random access response matches the wireless frame for transmitting the MsgA is the same as in the second example.
  • the terminal device 202 Process the random access response.
  • the terminal device 202 processing the random access response includes:
  • Operation 8022 If the RAPID in a MAC subPDU included in the random access response matches the MsgA Preamble, or if the contention resolution identifier in a MAC subPDU included in the random access response matches the CCCH SDU included in the MsgA PUSCH The terminal device 202 determines that the message B (MsgB) is successfully received.
  • MsgB message B
  • a MAC subPDU in the random access response contains falbackRAR and the RAPID in the MAC subPDU matches the preamble of MsgA, or if the random access response One MAC subPDU in the incoming response contains successRAR and the contention resolution identifier in the MAC subPDU matches the CCCH SDU in MsgA, and the terminal device 202 determines that the message B (MsgB) is successfully received;
  • the terminal device 202 determines that the message B (MsgB) is successfully received in operation 8022, the following operations are performed:
  • Operation 8023 Process the TAC contained in the RAR in the MAC subPDU: If the MsgA preamble belongs to the non-competitive random access preamble, or the MsgA preamble belongs to the competitive random access preamble and the TA timer of the TAG of the cell to which it belongs is not running, the terminal device starts or restarts the cell The TA timer of the belonging TAG applies the value of the TAC field to the TAG to which the cell belongs;
  • Operation 8024a For the case that the RAR in the MAC subPDU contains RAPID, the following operations are available:
  • Operation (1) notify the underlying MsgA preamble of the target received power preambleReceivedTargetPower and the target received power climb value, and/or notify the underlying MsgA PUSCH of the target received power and target received power climb value.
  • Operation (2) process the uplink resource grant in the MAC subPDU, and indicate the uplink resource grant to the physical layer for sending subsequent uplink data, such as sending Msg3 messages, where the uplink resource grant includes channel access for uplink data Type and/or channel access level (CAPC).
  • the uplink resource authorization includes 2 bits of information to indicate four types of channel access LBT: Cat1, Cat2/16us, Cat2/25us or Cat4.
  • cat1 When the terminal device sends uplink data, it can immediately send without monitoring the channel status.
  • the gap between the downlink transmission of the network device 201 and the uplink transmission of the terminal device is less than 16us, it indicates the cat1 type LBT; cat2/16us : The terminal device needs to monitor the channel condition within 16us before sending the uplink data.
  • the network device indicates the cat2/16us type LBT; cat2/25us: The terminal device needs to monitor the channel condition within 25us before sending the uplink data.
  • Cat4 type LBT is required before the terminal device sends uplink data.
  • the Cat4 type LBT is indicated.
  • the preamble belongs to the preamble of competitive or non-competitive random access, and the following operations are performed:
  • the terminal device determines that the random access process is completed
  • the terminal device sets the value of C-RNTI according to the TC_RNTI field in the MAC subPDU and sends Msg3 on the uplink authorized resource; in addition, If the random access response containing RAPID is successfully received for the first time in the random access process, the MAC PDU of Msg3 is obtained from the MsgA buffer and stored in the Msg3 buffer, and Msg3 is sent on the uplink authorized resource.
  • Operation 8024b The case where the MAC subPDU contains a contention resolution identifier: the terminal device 202 sets the value of C-RNTI according to the C_RNTI field contained in the MAC subPDU, and the terminal device determines that the random access process is complete; in addition, if the media access control sub-protocol data
  • the media access control sub-protocol data unit after the unit includes a signaling radio bearer (SRB) service data unit (SDU), and the SRB SDU is submitted to the higher layer for processing.
  • SRB signaling radio bearer
  • the frame number indication information is carried in the random access response.
  • the frame number indication information may be located in the protocol data unit (PDU) of the random access response.
  • PDU protocol data unit
  • the preset position for example, the preset position may be the first byte in a protocol data unit (PDU), etc.
  • Fig. 9 is a schematic diagram showing that the frame number indication information is located in the preset position in the protocol data unit of the random access response. As shown in Fig. 9, the frame number indication information S is located in the first byte of the protocol data unit (PDU). In addition, the present application is not limited to this, and the frame number indication information S may be located in other positions in the protocol data unit (PDU).
  • the frame number indication information may also be located at a preset position in at least one sub-protocol data unit (subPDU) of the random access response.
  • the preset position is, for example, the header and/or of each subPDU.
  • the at least one sub-protocol data unit is, for example, a sub-protocol data unit including a RAP ID or a sub-protocol data unit including a contention resolution identifier.
  • Fig. 10A is a schematic diagram showing that the frame number indication information is located in the preset position in the sub-protocol data unit.
  • the frame number indication information S is located in the header of each sub-protocol data unit (subPDU).
  • the Contention Resolution Identity (CRID) is located in the payload of the subPDU.
  • FIG. 10B is a schematic diagram showing that the frame number indication information is located in the preset position in the sub-protocol data unit. As shown in FIG. 10B, the frame number indication information S is located in the payload (header) of each sub-protocol data unit (subPDU).
  • the present application is not limited to this, and the frame number indication information S may also be located in other positions in the sub-protocol data unit (PDU).
  • PDU sub-protocol data unit
  • the frame number indication information may also be located in a predetermined sub-protocol data unit (subPDU) in the random access response, and the predetermined sub-protocol data unit may be a dedicated sub-protocol data unit set for the frame number indication information.
  • subPDU sub-protocol data unit
  • Fig. 11 is a schematic diagram showing that the frame number indication information is located in a predetermined sub-protocol data unit and a preset position in the sub-protocol data unit.
  • the sub-protocol data unit 2 represents the sub-protocol data unit dedicated to carrying frame number indication information S, where S is located at the head; the sub-protocol data unit 3 and the sub-protocol data unit n contain RAPID and CRID, respectively
  • the sub-protocol data unit, S is respectively located at the head of the sub-protocol data unit 3 and the sub-protocol data unit n.
  • the random access response may include an identifier for indicating the type of sub-protocol data unit (subPDU).
  • the identifier may be located in the header or payload of the corresponding sub-protocol data unit (subPDU).
  • the identifier In the case that the frame number indication information is located at a preset position in the protocol data unit (PDU) of the random access response, or at a preset position in at least one subprotocol data unit (subPDU) of the random access response, the identifier
  • the following sub-protocol data unit types can be identified: sub-protocol data unit containing backoff instruction information, sub-protocol data unit containing RAP ID, and sub-protocol data unit containing contention resolution identification.
  • the identifier T used to indicate the type of the sub-protocol data unit may include two bits.
  • FIG. 12 is a schematic diagram of using the identifier T to indicate various types of sub-protocol data units. As shown in Figure 12, the identifier T is included in the sub-protocol data unit of the backoff instruction information, the sub-protocol data unit of the RAP ID, and the header of the sub-protocol data unit of the contention resolution identifier.
  • the type of the protocol data unit is the sub-protocol data unit 123, 123a containing the contention resolution identifier.
  • the value of the E identifier is used to indicate whether the sub-protocol data unit is the last sub-protocol data unit in the random access response.
  • the sub-protocol data unit may have the E identifier or Does not have an E mark.
  • R represents reserved bits.
  • the corresponding relationship between the value of the identifier T and the type of the sub-protocol data unit is not limited to that shown in FIG. 12.
  • the identifier T used to indicate the type of the sub-protocol data unit may include a first sub-identity T1 and a second sub-identity T2.
  • the first sub-identity T1 may have 1 bit
  • the second sub-identity T2 may also It can have 1 bit.
  • the first sub-identity may be used to indicate that the sub-protocol data unit is one of a sub-protocol data unit including a RAP ID and a sub-protocol data unit including the second sub-identity
  • the second sub-identity is used to identify
  • the sub-protocol data unit is one of the sub-protocol data unit containing backoff instruction information and the sub-protocol data unit containing the contention resolution identifier.
  • FIG. 13 is another schematic diagram of using the identifier T to indicate various types of sub-protocol data units.
  • the identifier T1 is included in the header of the sub-protocol data unit of the RAP ID
  • T1 and T2 are included in the header of the sub-protocol data unit of the backoff indication information and the sub-protocol data unit of the contention resolution identifier.
  • the correspondence between the values of the first sub-identity T1 and the second sub-identity T2 of the identifier T and the type of the sub-protocol data unit is not limited to that shown in FIG. 13.
  • the subPDU containing the backoff indication information is located at the first MAC subPDU after the frame number indication information, or the first MAC subPDU of the random access response; the subPDU containing RAPID is located at the first MAC subPDU containing the backoff indication information.
  • the subPDU containing the contention resolution identifier is after the subPDU containing the RaPID and before the padding.
  • the MsgA PUSCH of the two-step random access may include the SRB SDU (that is, an RRC message) sent by the terminal device 202
  • the network device 201 may feedback One or two radio resource control (RRC) messages for the terminal device are multiplexed with the subPDU carrying the contention resolution identification of the terminal device in the same random access response PDU.
  • RRC radio resource control
  • SRB signaling resource bearer
  • FIG. 14 is a schematic diagram of the header of the contention resolution identification subPDU containing the SRB indication information and the header of the subPDU containing the SRB and SDU.
  • the header 141 of the subPDU including the contention resolution identifier may include SRB indication information, and the SRB indication information has, for example, 2 bits.
  • the header 142 of the subPDU containing the SRB SDU indicates the logical channel identifier (LCID) of the SRB and the length of the SRB SDU.
  • the header of the subPDU containing the SRB SDU can also be 142a.
  • the F identifier is used to indicate the number of bits occupied by the SRB SDU length field. For example, it can be used to distinguish the SRB SDU length field from 8 bits or 16 bits, including
  • the subPDU header of the SRB SDU may or may not have the F identifier.
  • the identification T can indicate the following sub-protocol data unit types: sub-protocol data unit containing backoff instruction information, sub-protocol data unit containing RAP ID, sub-protocol data unit containing contention resolution identification, and the predetermined sub-protocol data unit .
  • the identifier T used to indicate the type of the sub-protocol data unit may include two bits.
  • FIG. 15 is another schematic diagram of using the identifier T to indicate various types of sub-protocol data units. As shown in FIG. 15, the identifier T is included in the sub-protocol data unit of the backoff instruction information, the sub-protocol data unit of the RAP ID, the sub-protocol data unit of the contention resolution identifier, and the header of the predetermined sub-protocol data unit.
  • the corresponding relationship between the value of the identifier T and the type of the sub-protocol data unit is not limited to that shown in FIG. 15.
  • the identifier T used to indicate the type of the sub-protocol data unit may include a third sub-identity T3 and a fourth sub-identity T4, the third sub-identity T3 may have 1 bit, and the fourth sub-identity T4 may Has 2 bits.
  • the third sub-identity T3 is used to indicate that the sub-protocol data unit is one of the sub-protocol data unit of the RAP ID and the sub-protocol data unit containing the fourth sub-identity T4, and the fourth sub-identity T4 is used to indicate the sub-protocol data
  • the unit is one of a sub-protocol data unit including backoff instruction information, a sub-protocol data unit including a contention resolution identifier, and the predetermined sub-protocol data unit.
  • FIG. 16 is another schematic diagram of using the identifier T to indicate various types of sub-protocol data units.
  • the identifier T3 is included in the header of the sub-protocol data unit of the RAP ID
  • T3 and T4 are included in the sub-protocol data unit of the backoff indication information
  • the sub-protocol data unit of the contention resolution identifier and the predefined sub-protocol data unit
  • the header of the protocol data unit is another schematic diagram of using the identifier T to indicate various types of sub-protocol data units.
  • the identifier T3 is included in the header of the sub-protocol data unit of the RAP ID
  • T3 and T4 are included in the sub-protocol data unit of the backoff indication information
  • the sub-protocol data unit of the contention resolution identifier the sub-protocol data unit of the contention resolution identifier
  • the predefined sub-protocol data unit The header of the protocol data unit.
  • the correspondence between the values of the third sub-identity T3 and the fourth sub-identity T4 of the identifier T and the type of the sub-protocol data unit is not limited to that shown in FIG. 16.
  • the subPDU containing the frame number indication information S is the first subPDU of the random access response MAC PDU; the subPDU containing the backoff indication information is located after the MAC subPDU containing the frame number indication information and is located in the subPDU containing the RAPID And before the subPDU containing the contention resolution identification; the subPDU containing the RAPID is located after the subPDU containing the backoff indication information and before the subPDU containing the contention resolution identification; the subPDU containing the contention resolution identification can be located after the subPDU containing the RAPID and is located in the padding bit (padding )prior to.
  • the header or payload of the subPDU containing the contention resolution identifier in FIG. 16 may also have SRB indication information to indicate whether it is followed by the SRB SDU or SRB sent by the network device 201 to the terminal device 202. Indicate the number of SRB SDUs that follow, where each RRC message is contained in a subPDU, and the subPDU header indicates the logical channel identifier (LCID) of the SRB and the length of the SRB SDU.
  • LCID logical channel identifier
  • a random access response PDU there is only one subPDU with a contention resolution identifier followed by an SRB SDU, and the one subPDU with a contention resolution identifier is the last subPDU with a contention resolution identifier in the random access response.
  • the structure of the subPDU containing the SRB SDU may be similar to that in FIG. 14.
  • the random access response includes frame number indication information, and the frame number indication information is associated with sending Msg1 or MsgA.
  • the wireless frame matches it indicates that the random access response received by the terminal device is a response to the Msg1 or MsgA sent by the terminal device, thereby avoiding sending a preamble on different physical random access channels (PRACH) opportunities Of terminal devices are confused when receiving random access responses.
  • PRACH physical random access channels
  • the random access response contains the type identification of the sub-protocol data unit, which is aimed at the random access process or the two-step random access process of the unlicensed frequency band or the two-step random access process of the unlicensed frequency band.
  • the terminal can identify the type of random access response according to the type identification of the sub-protocol data unit, so as to complete the corresponding operation for different random access response types.
  • the second aspect of the embodiments of the present application relates to a random access method, which is applied to a network device, such as the network device 201.
  • FIG. 17 is a schematic diagram of the random access method in the second aspect of the embodiments of the present application.
  • the data transmission method may include:
  • Operation 1701 Receive the first message (MsgA) of the two-step random access procedure, or receive the second message (Msg1) of the random access procedure in the unlicensed frequency band;
  • a random access response is sent, where the physical downlink public control channel (PDCCH) of the random access response is addressed to the wireless network temporary identification, and the frame number indication information carried in the random access response matches the sending of the first A radio frame for a message or a radio frame for sending the second message.
  • PDCCH physical downlink public control channel
  • that the frame number indication information matches the wireless frame that sends the first message or the wireless frame of the second message means that the frame number indication information (S) is the wireless frame that sends the first message or the second message.
  • the Least Significant Bits (LSB) of the frame system frame number (SFN), or the frame number indication information (S) is the radio frame system frame number that sent the first message or the second message to the random access response receiving window.
  • the medium access control sub-protocol data unit (MAC subPDU) of the random access response includes: The sub-protocol data unit of the backoff instruction information, and the sub-protocol data unit containing the RAP ID.
  • the medium access control sub-protocol data unit (MAC subPDU) of the random access response may also include: a random access preamble identifier (RAP ID) corresponding to the preamble index sent by the terminal device 201 sending the second message, The uplink resource grant of the third message (msg3), the transmission timing advance command (TAC), and the cell radio network temporary identification (C-RNTI).
  • the uplink resource grant in the sub-protocol data unit including the RAP ID may include the channel access type and/or the channel access level (Channel Access Priority Class, CAPC) of the third message (Msg3).
  • CAPC Channel Access Priority Class
  • the possible media access control sub-protocol data unit of the random access response includes: The sub-protocol data unit, the sub-protocol data unit including the RAP ID, and the sub-protocol data unit including the contention resolution identification.
  • the random access response sent by the network device 201 has a sub-protocol data unit containing the RAP ID; for another example, if the network device 201 successfully decodes Adjust the data part of msgA, then the random access response sent by the network device 201 has the sub-protocol data unit containing the contention resolution identifier.
  • the possible medium access control subprotocol data unit (MAC subPDU) of the random access response may also include: and sending the first message (MsgA).
  • the possible medium access control sub-protocol data unit of the random access response may also include: a signaling radio bearer (SRB) service
  • SRB signaling radio bearer
  • the sub-protocol data unit containing the contention resolution identifier carries the indication information of the number of sub-protocol data units containing a signaling radio bearer (SRB) service data unit (SDU).
  • the frame number indication information is located at a preset position in a protocol data unit (PDU) of the random access response, or at a preset position in at least one sub-protocol data unit (subPDU) of the random access response. Set location.
  • PDU protocol data unit
  • subPDU sub-protocol data unit
  • the sub-protocol data unit (subPDU) of the random access response includes an identifier for indicating the type of the sub-protocol data unit
  • the type of the sub-protocol data unit includes: the sub-protocol data unit including backoff indication information, including RAP The sub-protocol data unit of the ID and the sub-protocol data unit containing the contention resolution identification.
  • the identifier T indicating the type of the sub-protocol data unit includes a first sub-identity T1 and a second sub-identity T2, and the first sub-identity is used to indicate that the sub-protocol data unit is a sub-protocol data unit containing a RAP ID and a second sub-identity.
  • One of the sub-protocol data units of the sub-identity T2, and the second sub-identity T2 is used to indicate that the sub-protocol data unit is one of a sub-protocol data unit containing back-off indication information and a sub-protocol data unit containing a contention resolution identifier By.
  • the frame number indication information is located in a predetermined sub-protocol data unit (subPDU) in the random access response.
  • subPDU sub-protocol data unit
  • the sub-protocol data unit (subPDU) of the random access response includes an identifier for indicating the type of the sub-protocol data unit, and the type of the sub-protocol data unit includes: the sub-protocol data unit including backoff indication information, including RAP
  • the sub-protocol data unit of the ID includes the sub-protocol data unit of the contention resolution identification and the predetermined sub-protocol data unit.
  • the identifier T indicating the type of the sub-protocol data unit includes a third sub-identity T3 and a fourth sub-identity T4.
  • the third sub-identity T3 is used to indicate that the sub-protocol data unit is a sub-protocol data unit containing a RAP ID and a fourth sub-identifier.
  • Identifies one of the sub-protocol data units of T4 and the fourth sub-identity T4 is used to indicate that the sub-protocol data unit is a sub-protocol data unit containing backoff indication information, a sub-protocol data unit containing a contention resolution identifier, and a predetermined sub-protocol One of the data units.
  • the random access response includes frame number indication information, and the frame number indication information is associated with sending Msg1 or MsgA.
  • the wireless frame matches it indicates that the random access response received by the terminal device is a response to the Msg1 or MsgA sent by the terminal device, thereby avoiding sending a preamble on different physical random access channels (PRACH) opportunities Of terminal devices are confused when receiving random access responses.
  • PRACH physical random access channels
  • the third aspect of the embodiments of the present application provides a random access device, which is applied to a terminal device, for example, the terminal device 202.
  • the random access device is used to implement the random access method described in the first aspect of the embodiment.
  • FIG. 18 is a schematic diagram of the random access device in the third aspect of the embodiments of the present application. As shown in FIG. 18, the random access device 1800 includes a first transmission unit 1801.
  • the first transmission unit 1801 may implement the random access method described in the first aspect of the embodiments of the present application.
  • the random access method implemented by the first transmission unit 1801 reference may be made to the description of the random access method in the first aspect of the embodiments of the present application.
  • the fourth aspect of the embodiments of the present application provides a random access device, which is applied to a network device, for example, the network device 201.
  • the random access device is used to implement the random access method described in the second aspect of the embodiment.
  • FIG. 19 is a schematic diagram of the random access device in the fourth aspect of the embodiments of the present application. As shown in FIG. 19, the random access device 1900 includes a second transmission unit 1901.
  • the second transmission unit 1901 may implement the random access method described in the second aspect of the embodiments of the present application.
  • the description of the random access method implemented by the second transmission unit 1901 reference may be made to the description of the random access method in the second aspect of the embodiments of the present application.
  • a fifth aspect of the embodiments of the present application provides a terminal device, and the terminal device includes the random access apparatus 1800 described in the third aspect of the embodiment.
  • FIG. 20 is a schematic block diagram of the system configuration of the terminal device 2000 in the fifth aspect of the embodiments of the present application.
  • the terminal device 2000 may include a processor 2010 and a memory 2020; the memory 2020 is coupled to the processor 2010. It is worth noting that this figure is exemplary; other types of structures can also be used to supplement or replace this structure to achieve telecommunication functions or other functions.
  • the function of the random access device 1800 may be integrated into the processor 2010.
  • the processor 2010 may be configured to be able to implement the random access method of the first aspect of the embodiment.
  • the random access device 1800 can be configured separately from the processor 2010.
  • the random access device 1800 can be configured as a chip connected to the processor 2010, and the random access device can be realized by the control of the processor 2010. 1800 functions.
  • the terminal device 2000 may further include: a communication module 2030, an input unit 2040, a display 2050, and a power supply 2060. It is worth noting that the terminal device 2000 does not necessarily include all the components shown in FIG. 20; in addition, the terminal device 2000 may also include components not shown in FIG. 20, and reference may be made to the prior art.
  • the processor 2010 is sometimes called a controller or an operating control, and may include a microprocessor or other processor device and/or logic device.
  • the processor 2010 receives input and controls the operation of each component of the terminal device 2000. operating.
  • the memory 2020 may be, for example, one or more of a cache, a flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory, or other suitable devices.
  • Various data can be stored, in addition to the program that executes related information.
  • the processor 2010 can execute the program stored in the memory 2020 to implement information storage or processing.
  • the functions of other components are similar to the existing ones, so I won't repeat them here.
  • Each component of the terminal device 2000 can be implemented by dedicated hardware, firmware, software, or a combination thereof, without departing from the scope of the present application.
  • a sixth aspect of the embodiments of the present application provides a network device, and the network device includes the random access apparatus 1900 described in the fourth aspect of the embodiment.
  • FIG. 21 is a schematic diagram of a structure of a network device according to an embodiment of the present application.
  • the network device 2100 may include: a processor 2110 and a memory 2120; the memory 2120 is coupled to the processor 2110.
  • the memory 2120 can store various data; in addition, it also stores an information processing program 2130, and executes the program 2130 under the control of the processor 2110 to receive various information sent by the user equipment and send request information to the user equipment.
  • the function of the random access device 1900 may be integrated into the processor 2110.
  • the processor 2110 may be configured to implement the random access method described in the second aspect of the embodiments of the present application.
  • the random access device 1900 can be configured separately from the processor 2110.
  • the random access device 1900 can be configured as a chip connected to the processor 2110, and the random access device can be implemented through the control of the processor 2110. 1900 features.
  • the network device 2100 may further include: a transceiver 2140, an antenna 2150, etc.; wherein the functions of the above-mentioned components are similar to those of the prior art, and will not be repeated here. It should be noted that the network device 2100 does not necessarily include all the components shown in FIG. 21; in addition, the network device 2100 may also include components not shown in FIG. 21, and the prior art can be referred to.
  • the seventh aspect of the embodiments of the present application further provides a communication system, including the network device described in the sixth aspect of the embodiment and the terminal device described in the fifth aspect of the embodiment.
  • the above devices and methods of this application can be implemented by hardware, or can be implemented by hardware combined with software.
  • This application relates to such a computer-readable program.
  • the logic component can realize the above-mentioned device or constituent component, or the logic component can realize the above-mentioned various methods. Or steps.
  • This application also relates to storage media used to store the above programs, such as hard disks, magnetic disks, optical disks, DVDs, flash memory, etc.
  • the method/device described in conjunction with the embodiments of the present application may be directly embodied as hardware, a software module executed by a processor, or a combination of the two.
  • one or more of the functional block diagrams and/or one or more combinations of the functional block diagrams shown in the figure may correspond to each software module of the computer program flow or each hardware module.
  • These software modules can respectively correspond to the steps shown in the figure.
  • These hardware modules can be implemented by solidifying these software modules by using a field programmable gate array (FPGA), for example.
  • FPGA field programmable gate array
  • the software module can be located in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM or any other form of storage medium known in the art.
  • a storage medium may be coupled to the processor, so that the processor can read information from the storage medium and write information to the storage medium; or the storage medium may be a component of the processor.
  • the processor and the storage medium may be located in the ASIC.
  • the software module can be stored in the memory of the mobile terminal, or can be stored in a memory card that can be inserted into the mobile terminal.
  • the software module can be stored in the MEGA-SIM card or a large-capacity flash memory device.
  • One or more of the functional blocks described in the drawings and/or one or more combinations of the functional blocks can be implemented as general-purpose processors, digital signal processors (DSPs) for performing the functions described in this application. ), application specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component or any appropriate combination thereof.
  • DSPs digital signal processors
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • One or more of the functional blocks described in the drawings and/or one or more combinations of the functional blocks can also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, and multiple micro-processing Processor, one or more microprocessors in communication with the DSP, or any other such configuration.
  • a random access method, applied to terminal equipment including:
  • the physical downlink common control channel (PDCCH) of the random access response is addressed to the wireless network temporary identification and the frame number indication information carried in the random access response matches the wireless frame or the sending station for sending the first message In the case of the radio frame of the second message, the random access response is processed.
  • PDCCH physical downlink common control channel
  • the frame number indication information (S) is the low-order bits (LSB, Least Significant Bits) of the system frame number (SFN) of the radio frame sending the first message or the second message, or the frame number indication information ( S) is the modulus of the number of radio frames included in the random access response receiving window length from the frame number of the radio frame system sending the first message or the second message.
  • step of processing the random access response includes:
  • RAP ID random access preamble identifier
  • MAC subPDU medium access control subprotocol data unit
  • the uplink resource authorization includes the channel access type and/or channel access level (Channel Access Priority Class, CAPC) of the uplink data.
  • CAPC Channel Access Priority Class
  • step of processing the random access response includes:
  • RAP ID random access preamble identifier
  • MAC subPDU medium access control sub-protocol data unit
  • MsgA preamble of the first message
  • MsgB common control channel service data unit
  • RAP ID random access preamble identifier
  • MAC subPDU medium access control subprotocol data unit
  • the target received power and target received power climb value of the preamble (msgA preamble) of the first message and/or
  • step of processing the random access response further comprises:
  • a third message is obtained from the buffer of the first message (MsgA) ( Msg3) media access control protocol data unit (MAC PDU) and store it in the third message (Msg3) buffer;
  • step of processing the random access response further comprises:
  • the preamble of the first message belongs to the preamble of non-contention random access, it is determined that the random access process is completed.
  • step of processing the random access response further comprises:
  • step of processing the random access response includes:
  • the random access response contains a media access control sub-protocol data unit (MAC subPDU) containing backoff instruction information
  • MAC subPDU media access control sub-protocol data unit
  • step of processing the random access response includes:
  • the frame number indication information is located in a preset position in a protocol data unit (PDU) of the random access response, or is located in a preset position in at least one of the sub-protocol data unit (subPDU) of the random access response position.
  • PDU protocol data unit
  • subPDU sub-protocol data unit
  • the sub-protocol data unit (subPDU) of the random access response includes an identifier for indicating the type of the sub-protocol data unit, and the type of the sub-protocol data unit includes: the sub-protocol data unit including backoff indication information, including the RAP ID The sub-protocol data unit of, and the sub-protocol data unit containing the contention resolution identification.
  • the identifier indicating the type of the sub-protocol data unit includes a first sub-identity and a second sub-identity
  • the second sub-identification is used to identify the sub-protocol data unit as one of a sub-protocol data unit including backoff instruction information and a sub-protocol data unit including a contention resolution identifier.
  • the frame number indication information is located in a predetermined sub-protocol data unit (subPDU) in the random access response.
  • subPDU sub-protocol data unit
  • the sub-protocol data unit (subPDU) of the random access response includes an identifier for indicating the type of the sub-protocol data unit, and the type of the sub-protocol data unit includes: the sub-protocol data unit including backoff indication information, including the RAP ID
  • the sub-protocol data unit includes the sub-protocol data unit of the contention resolution identification and the predetermined sub-protocol data unit.
  • the identifier indicating the type of the sub-protocol data unit includes a third sub-identity and a fourth sub-identity
  • the third sub-identity is used to indicate that the sub-protocol data unit is one of the sub-protocol data unit of the RAP ID and the sub-protocol data unit including the fourth sub-identity,
  • the fourth sub-identification is used to indicate that the sub-protocol data unit is one of a sub-protocol data unit including backoff instruction information, a sub-protocol data unit including a contention resolution identifier, and the predetermined sub-protocol data unit.
  • a random access method applied to network equipment including:
  • the physical downlink public control channel (PDCCH) of the random access response is addressed to the wireless network temporary identification, and the frame number indication information carried in the random access response matches the radio frame or the wireless frame in which the first message is sent.
  • the wireless frame for sending the second message is addressed to the wireless network temporary identification, and the frame number indication information carried in the random access response matches the radio frame or the wireless frame in which the first message is sent.
  • the wireless frame for sending the second message is
  • the frame number indication information (S) is the low-order bits (LSB, Least Significant Bits) of the system frame number (SFN) of the radio frame sending the first message or the second message, or the frame number indication information ( S) is a modulus of the number of radio frames included in the length of the random access response receiving window by the system frame number of the radio frame sending the first message or the second message.
  • the medium access control sub-protocol data unit (MAC subPDU) of the random access response includes: a sub-protocol data unit including backoff indication information, and a sub-protocol data unit including RAP ID.
  • the uplink resource grant in the sub-protocol data unit including the RAP ID includes the channel access type and/or the channel access class (Channel Access Priority Class, CAPC) of the uplink data.
  • CAPC Channel Access Priority Class
  • the medium access control sub-protocol data unit of the random access response includes: a sub-protocol data unit including backoff instruction information, a sub-protocol data unit including a RAP ID, and a sub-protocol data unit including a contention resolution identifier.
  • the medium access control sub-protocol data unit of the random access response further comprises: a sub-protocol data unit including a signaling radio bearer (SRB) service data unit (SDU) ;
  • SRB signaling radio bearer
  • SDU service data unit
  • the sub-protocol data unit including the contention resolution identifier carries the indication information of the number of the sub-protocol data unit (SDU) including the signaling radio bearer (SRB) service data unit (SDU).
  • SDU sub-protocol data unit
  • SRB signaling radio bearer
  • the frame number indication information is located in a preset position in a protocol data unit (PDU) of the random access response, or is located in a preset position in at least one of the sub-protocol data unit (subPDU) of the random access response position.
  • PDU protocol data unit
  • subPDU sub-protocol data unit
  • the sub-protocol data unit (subPDU) of the random access response includes an identifier for indicating the type of the sub-protocol data unit, and the type of the sub-protocol data unit includes: the sub-protocol data unit including backoff indication information, including the RAP ID The sub-protocol data unit of, and the sub-protocol data unit containing the contention resolution identification.
  • the identifier indicating the type of the sub-protocol data unit includes a first sub-identity and a second sub-identity
  • the first sub-identity is used to indicate that the sub-protocol data unit is one of the sub-protocol data unit including the RAP ID and the sub-protocol data unit including the second sub-identity,
  • the second sub-identifier is used to indicate that the sub-protocol data unit is one of a sub-protocol data unit including backoff instruction information and a sub-protocol data unit including a contention resolution identifier.
  • the frame number indication information is located in a predetermined sub-protocol data unit (subPDU) in the random access response.
  • subPDU sub-protocol data unit
  • the sub-protocol data unit (subPDU) of the random access response includes an identifier for indicating the type of the sub-protocol data unit, and the type of the sub-protocol data unit includes: the sub-protocol data unit including backoff indication information, including the RAP ID
  • the sub-protocol data unit includes the sub-protocol data unit of the contention resolution identification and the predetermined sub-protocol data unit.
  • the identifier indicating the type of the sub-protocol data unit includes a third sub-identity and a fourth sub-identity
  • the third sub-identity is used to indicate that the sub-protocol data unit is one of a sub-protocol data unit including a RAP ID and a sub-protocol data unit including the fourth sub-identity,
  • the fourth sub-identification is used to indicate that the sub-protocol data unit is one of a sub-protocol data unit including backoff instruction information, a sub-protocol data unit including a contention resolution identifier, and the predetermined sub-protocol data unit.

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

Abstract

L'invention concerne un procédé et un dispositif d'accès aléatoire, ainsi qu'un système de communication. Le dispositif comprend une première unité de transmission. Ladite première unité de transmission est configurée pour : envoyer à un dispositif de réseau un premier message (MsgA) d'une procédure d'accès aléatoire en deux étapes ou envoyer dans une bande de fréquences sans licence un second message (Msg1) d'une procédure d'accès aléatoire ; recevoir une réponse d'accès aléatoire envoyée par le dispositif de réseau ; et traiter la réponse d'accès aléatoire lorsqu'un canal physique commun de commande de liaison descendante (PDCCH) de la réponse d'accès aléatoire est adressé à un identifiant temporaire de réseau radio et lorsque des informations d'indication du nombre de trames véhiculées par la réponse d'accès aléatoire correspondent à la trame radio dans laquelle le premier message a été envoyé ou à la trame radio dans laquelle le second message a été envoyé.
PCT/CN2019/109476 2019-09-30 2019-09-30 Procédé et dispositif d'accès aléatoire et système de communication WO2021062639A1 (fr)

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