WO2021077343A1 - Procédé de communication sans fil et dispositif terminal - Google Patents

Procédé de communication sans fil et dispositif terminal Download PDF

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Publication number
WO2021077343A1
WO2021077343A1 PCT/CN2019/112861 CN2019112861W WO2021077343A1 WO 2021077343 A1 WO2021077343 A1 WO 2021077343A1 CN 2019112861 W CN2019112861 W CN 2019112861W WO 2021077343 A1 WO2021077343 A1 WO 2021077343A1
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Prior art keywords
random access
rach resource
terminal device
target
access process
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PCT/CN2019/112861
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English (en)
Chinese (zh)
Inventor
石聪
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Oppo广东移动通信有限公司
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Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to PCT/CN2019/112861 priority Critical patent/WO2021077343A1/fr
Priority to CN201980099420.0A priority patent/CN114246013B/zh
Publication of WO2021077343A1 publication Critical patent/WO2021077343A1/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 communication field, and more specifically, to a wireless communication method and terminal device.
  • the New Radio (NR) system can support a contention-based two-step random access (CBRA) process (abbreviated as CBRA).
  • CBRA contention-based two-step random access
  • messages in the four-step random access process can be 1 (Message 1, Msg 1) and Message 3 (Msg 3) are sent as the first message (Message A, Msg A) in the two-step CBRA, and the message 2 (Msg 2) in the four-step random access process )
  • message 4 (Msg 4) are sent as the second message (Message B, Msg B) in the two-step CBRA, where the Msg3 can be used by the network device to identify the UE for contention conflict resolution.
  • the NR system also supports Contention Free two-step random access process (CFRA).
  • CFRA Contention Free two-step random access process
  • Msg1 and Msg3 in MsgA are UE-specific, that is, network equipment can receive The Msg1 recognizes the terminal device.
  • the terminal device wants to initiate a two-step CFBA, but fails to select the appropriate beam, it needs to fall back to the contention-based random access process. In this case, how does the terminal device perform data transmission to make the network It is an urgent problem that the device can identify the terminal device to resolve the competition conflict.
  • the embodiments of this application provide a wireless communication method and terminal equipment.
  • the terminal equipment can regroup the cached MAC PDU and C-RNTI MAC CE, so that the network equipment can identify the C-RNTI MAC CE in the new group package. If the terminal device is exported, it can further resolve the contention conflict according to the C-RNTI MAC CE.
  • a wireless communication method includes: a terminal device measures at least one reference signal to determine a target reference signal for a non-competitive two-step random access process; if the at least one reference signal is There is no reference signal that satisfies the conditions in the signal, and the terminal device determines to adopt a contention-based random access procedure; the terminal device indicates that the multiplexing and grouping entity includes the cell radio network temporary identifier C-RNTI MAC control element CE and At least one media access control MAC sub-protocol data unit PDU to obtain a target MAC PDU, wherein the at least one MAC sub-PDU includes the MAC service data unit SDU in the buffered MAC PDU and the buffered MAC PDU does not include C -RNTI MAC CE: The terminal device initiates a contention-based random access process, carries the target MAC PDU on the physical uplink shared channel PUSCH and sends it to the network device.
  • a terminal device which is used to execute the method in the above-mentioned first aspect or each of its implementation manners.
  • the terminal device includes a functional module for executing the method in the foregoing first aspect or each of its implementation manners.
  • a terminal device including a processor and a memory.
  • the memory is used to store a computer program
  • the processor is used to call and run the computer program stored in the memory to execute the method in the above-mentioned first aspect or each of its implementation modes.
  • a device for implementing the method in the first aspect or its implementation manners.
  • the device includes a processor, configured to call and run a computer program from the memory, so that the device installed with the device executes the method in the first aspect or its implementation manners.
  • a computer-readable storage medium for storing a computer program that enables a computer to execute the method in the above-mentioned first aspect or each of its implementation manners.
  • a computer program product including computer program instructions that cause a computer to execute the method in the first aspect or its implementation manners.
  • a computer program which when running on a computer, causes the computer to execute the method in the first aspect or its implementation manners.
  • the terminal device determines to use the contention-based random access procedure to initiate random access.
  • the transmission data is packaged and placed in the buffer, and the MAC PDU in the buffer does not include C-RNTI MAC CE. Therefore, when determining to initiate a contention-based random access process, the terminal device can indicate the pairing of multiplexing and grouping entities
  • the cached MAC PDU and C-RNTI MAC CE are repacked, and further can be sent to the network device through an uplink message in the random access process, so that the network device can resolve the contention conflict according to the C-RNTI MAC CE.
  • Fig. 1 is a schematic diagram of a communication system architecture provided by an embodiment of the present application.
  • Figure 2 is a schematic diagram of a four-step random access provided by an embodiment of the present application.
  • Fig. 3 is a schematic diagram of a four-step random access to a two-step random access according to an embodiment of the present application.
  • Fig. 4 is a schematic flowchart of a wireless communication method according to an embodiment of the present application.
  • Fig. 5 is a schematic block diagram of a terminal device according to an embodiment of the present application.
  • Fig. 6 is a schematic block diagram of a communication device according to an embodiment of the present application.
  • Fig. 7 is a schematic block diagram of a chip provided according to an embodiment of the present application.
  • GSM Global System of Mobile Communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • LTE-A Advanced Long Term Evolution
  • New Air Interface New Radio, NR
  • evolution of NR system LTE (LTE-based access to unlicensed spectrum, LTE-U) system on unlicensed spectrum, NR (NR-based access to unlicensed spectrum, on unlicensed spectrum, NR-U) system, Universal Mobile Telecommunication System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (WiFi), next-generation communication systems or other communication systems, etc.
  • D2D Device to Device
  • M2M Machine to Machine
  • MTC machine type communication
  • V2V vehicle to vehicle
  • the communication system in the embodiments of the present application can be applied to a carrier aggregation (Carrier Aggregation, CA) scenario, can also be applied to a dual connectivity (DC) scenario, and can also be applied to a standalone (SA) deployment.
  • CA Carrier Aggregation
  • DC dual connectivity
  • SA standalone
  • the embodiment of the application does not limit the applied frequency spectrum.
  • the embodiments of this application can be applied to licensed spectrum or unlicensed spectrum.
  • the communication system 100 applied in the embodiment of the present application is shown in FIG. 1.
  • the communication system 100 may include a network device 110, and the network device 110 may be a device that communicates with a terminal device 120 (or called a communication terminal or terminal).
  • the network device 110 may provide communication coverage for a specific geographic area, and may communicate with terminal devices located in the coverage area.
  • Figure 1 exemplarily shows one network device and two terminal devices.
  • the communication system 100 may include multiple network devices and the coverage of each network device may include other numbers of terminal devices. The embodiment does not limit this.
  • the communication system 100 may also include other network entities such as a network controller and a mobility management entity, which are not limited in the embodiment of the present application.
  • network entities such as a network controller and a mobility management entity, which are not limited in the embodiment of the present application.
  • the devices with communication functions in the network/system in the embodiments of the present application may be referred to as communication devices.
  • the communication device may include a network device 110 having a communication function and a terminal device 120.
  • the network device 110 and the terminal device 120 may be the specific devices described above, which will not be repeated here.
  • the communication device may also include other devices in the communication system 100, such as network controllers, mobility management entities, and other network entities, which are not limited in the embodiment of the present application.
  • terminal equipment may also be referred to as User Equipment (UE), access terminal, subscriber unit, user station, mobile station, mobile station, and remote Station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.
  • UE User Equipment
  • the terminal device can be a station (STAION, ST) in a WLAN, a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, and personal digital processing (Personal Digital Assistant, PDA) devices, handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, and next-generation communication systems, such as terminal devices in the NR network or Terminal equipment in the public land mobile network (PLMN) network that will evolve in the future.
  • STAION, ST station
  • WLAN Wireless Local Loop
  • PDA Personal Digital Assistant
  • the terminal device may also be a wearable device.
  • Wearable devices can also be called wearable smart devices. It is a general term for using wearable technology to intelligently design everyday wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes.
  • a wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories. Wearable devices are not only a kind of hardware device, but also realize powerful functions through software support, data interaction, and cloud interaction.
  • wearable smart devices include full-featured, large-sized, complete or partial functions that can be achieved without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, and need to cooperate with other devices such as smart phones.
  • a network device can be a device used to communicate with mobile devices.
  • the network device can be an access point (AP) in WLAN, a base station (BTS) in GSM or CDMA, or a device in WCDMA.
  • a base station (NodeB, NB) can also be an Evolutional Node B (eNB or eNodeB) in LTE, or a relay station or access point, or a vehicle-mounted device, a wearable device, and a network device or base station in the NR network (gNB) or network equipment in the future evolved PLMN network.
  • the network equipment provides services for the cell
  • the terminal equipment communicates with the network equipment through the transmission resources (for example, frequency domain resources, or spectrum resources) used by the cell
  • the cell may be a network equipment (for example, The cell corresponding to the base station.
  • the cell can belong to a macro base station or a base station corresponding to a small cell.
  • the small cell here can include: Metro cell, Micro cell, Pico Cells, Femto cells, etc. These small cells have the characteristics of small coverage and low transmit power, and are suitable for providing high-rate data transmission services.
  • the terminal device After the cell search process, the terminal device has achieved downlink synchronization with the cell, so the terminal device can receive downlink data. However, the terminal equipment can only perform uplink transmission if it has achieved uplink synchronization with the cell.
  • the terminal device can establish a connection with the cell and obtain uplink synchronization through a random access procedure (Random Access Procedure).
  • Random Access Procedure Random Access Procedure
  • the random access process can usually be triggered by the following events:
  • the terminal device can enter the RRC connected state (RRC_CONNECTED) from the radio resource control (Radio Resource Control, RRC) idle state (RRC_IDLE state).
  • RRC Radio Resource Control
  • the terminal device is in the connected state and needs to establish uplink synchronization with the new cell.
  • the uplink is in a "non-synchronised” state (DL or UL data arrival during RRC_CONNECTED when UL synchronisation status is "non-synchronised”).
  • the terminal device transitions from the RRC inactive state (Transition from RRC_INACTIVE).
  • the terminal device requests other system information (Other System Information, OSI).
  • OSI Operating System Information
  • the terminal device needs to perform beam failure recovery.
  • the four-step random access process includes:
  • Step 1 The terminal device sends a random access preamble (Preamble, that is, message1, Msg1) to the network device.
  • Preamble that is, message1, Msg1
  • the random access preamble may also be referred to as a preamble, a random access preamble sequence, a preamble sequence, and so on.
  • the terminal device can select physical random access channel (Physical Random Access Channel, PRACH) resources, and the PRACH resources can include time domain resources, frequency domain resources, and code domain resources.
  • PRACH Physical Random Access Channel
  • the terminal device can send the selected Preamble on the selected PRACH resource.
  • the network device can estimate the transmission delay between it and the terminal device according to the Preamble and adjust the uplink timing accordingly, and can roughly determine the size of the resource required for the terminal device to transmit the message 3 (Msg 3).
  • Step 2 The network device sends a random access response (Random Access Response, RAR, that is, message2, Msg2) to the terminal device
  • RAR Random Access Response
  • the terminal device After the terminal device sends the Preamble to the network device, it can open a RAR window, in which RAR window detects the corresponding physical downlink control channel (Physical Downlink) according to the random access radio network temporary identifier (Random Access Radio Network Temporary Identifier, RA-RNTI) Control Channel, PDCCH). If the terminal device detects the PDCCH scrambled by the RA-RNTI, it can obtain the Physical Downlink Shared Channel (PDSCH) scheduled by the PDCCH. Wherein, the PDSCH includes the RAR corresponding to the Preamble.
  • RA-RNTI Random Access Radio Network Temporary Identifier
  • the terminal device can consider that this random access procedure has failed. It should be understood that both the terminal device and the network device need to uniquely determine the value of RA-RNTI, otherwise the terminal device cannot decode the RAR.
  • the RA-RNTI may calculate the value of the RA-RNTI through the time-frequency position of the Preamble that is clear to both the sender and the receiver.
  • the RA-RNTI associated with Preamble can be calculated by formula 1:
  • RA-RNTI 1+s_id+14 ⁇ t_id+14 ⁇ 80 ⁇ f_id+14 ⁇ 80 ⁇ 8 ⁇ ul_c_id Formula 1
  • s_id is the index of the first Orthogonal Frequency Division Multiplexing (OFDM) symbol of the PRACH resource (0 ⁇ s_id ⁇ 14), and t_id is the index of the first time slot of the PRACH resource in a system frame.
  • f_id is the index of PRACH resource in the frequency domain (0 ⁇ f_id ⁇ 8)
  • ul_c_id is the uplink carrier used to transmit the preamble (0 represents the normal uplink (Normal Uplink, NUL) carrier
  • 1 represents Supplementary Uplink (SUL) carrier).
  • FDD Frequency Division Duplexing
  • each subframe has only one PRACH resource, so f_id is fixed to 0.
  • the network device since the time-frequency position of the Preamble sent by the terminal device is determined, the network device also obtains the time-frequency position of the Preamble when decoding the Preamble, and can then know the RA-RNTI that needs to be used in the RAR.
  • the terminal device successfully receives a RAR (using the determined RA-RNTI to decode), and the random access sequence identifier (Random Access Preamble Identifier, RAPID) in the RAR is the same as the preamble index sent by the terminal device, it can It is considered that the RAR is successfully received, and the terminal device can stop detecting the PDCCH scrambled by the RA-RNTI at this time.
  • RAPID Random Access Preamble Identifier
  • Step 3 The terminal device sends Msg 3.
  • the terminal device After receiving the RAR message, the terminal device determines whether the RAR is its own RAR message. For example, the terminal device can use the preamble index to check, and after determining that it is its own RAR message, it can generate Msg 3 at the RRC layer, and Send Msg 3 to the network device, which needs to carry the identification information of the terminal device, etc.
  • Msg 3 is mainly used to notify the network equipment of the random access trigger event.
  • the Msg 3 sent by the terminal device in step 3 may include different content.
  • Msg 3 may include an RRC connection request message (RRC Setup Request) generated by the RRC layer.
  • RRC Setup Request RRC Setup Request
  • Msg3 may also carry, for example, the 5G-service temporary mobile subscriber identity (Serving-Temporary Mobile Subscriber Identity, S-TMSI) or random number of the terminal device.
  • S-TMSI Serving-Temporary Mobile Subscriber Identity
  • Msg 3 may include an RRC connection re-establishment request message (RRC Reestabilshment Request) generated by the RRC layer.
  • RRC Reestabilshment Request RRC connection re-establishment request message
  • Msg 3 may also carry, for example, a Cell Radio Network Temporary Identifier (C-RNTI) and so on.
  • C-RNTI Cell Radio Network Temporary Identifier
  • Msg 3 may include an RRC handover confirmation message (RRC Handover Confirm) generated by the RRC layer, which carries the C-RNTI of the terminal device.
  • RRC Handover Confirm RRC handover confirmation message
  • Msg 3 may also carry information such as a Buffer Status Report (BSR).
  • BSR Buffer Status Report
  • Msg 3 may at least include the C-RNTI of the terminal device.
  • Step 4 The network device sends a contention resolution message (Msg4) to the terminal device.
  • Msg4 contention resolution message
  • the network device sends Msg 4 to the terminal device, and the terminal device correctly receives the Msg 4 to complete the contention resolution (Contention Resolution).
  • Msg 4 may carry an RRC connection establishment message.
  • the network device Since the terminal device in step 3 can carry its own unique identifier in Msg 3, the network device will carry the unique identifier of the terminal device in Msg4 in the contention resolution mechanism to specify the terminal device that wins the competition. Other terminal devices that did not win in the contention resolution will re-initiate random access.
  • the Msg 4 can be scheduled with the PDCCH scrambled by the TC-RNTI.
  • the contention conflict resolution can be achieved by receiving the PDSCH of the Msg 4 by the terminal device, and obtaining the conflict resolution ID.
  • the conflict resolution ID By matching the conflict resolution ID with the common control channel (CCCH) service data unit (Service Data Unit) in the Msg 3 Data Unit, SDU) to determine whether to resolve the conflict.
  • CCCH common control channel
  • Service Data Unit Service Data Unit
  • the delay of four-step random access is relatively large, which cannot meet the needs of low-latency and high-reliability services in the 5G NR system, so a two-step random access process is proposed.
  • the two-step random access process is equivalent to combining the first and third steps of the four-step random access process into the first step in the two-step random access process.
  • the second step and the fourth step of the entry process are combined into the second step of the two-step random access process.
  • This random access process can be called a contention-based two-step random access process (2-step CBRA).
  • the two-step random access procedure may include:
  • Step 1 The terminal device sends the first message (Msg A) to the network device.
  • Msg A may consist of a preamble and a payload (payload).
  • the preamble is a four-step random access preamble.
  • the preamble is transmitted on the PRACH resource.
  • the payload mainly carries information in the Msg 3 of the four-step random access.
  • it can include CCCH SDU, such as corresponding to random access in RRC idle state, or C-RNTI media access control control element (Media Access Control Control Element, MAC CE), such as mainly corresponding to random access in RRC connected state Access.
  • the payload may be carried on an uplink channel, and the uplink channel may be, for example, a physical uplink shared channel (PUSCH).
  • PUSCH physical uplink shared channel
  • Msg A may carry part or all of the information carried in the Preamble and Msg 3 in the four-step random access process.
  • Step 2 The network device sends the second message (Msg B) to the terminal device.
  • the network device can send Msg B to the terminal device.
  • the Msg B may include part or all of the information carried in Msg 2 and Msg 4 in the four-step random access process. It should be understood that the embodiment of the present application does not limit the names of Msg A and Msg B, that is, they can also be expressed as other names.
  • the first piece of information may also be called a random access request message or a new Msg1
  • the second piece of information may also be called a random access response message or a new Msg2.
  • FIG. 3 is only a specific implementation of the two-step random access process, and should not limit the protection scope of the present application.
  • a non-competitive random access process is also supported, namely, two-step CFRA (or 2-step CFRA).
  • the Msg1 (preamble) and Msg3 (such as PUSCH) in the MsgA in the two-step CFRA can be the UE Exclusive, for example, the network device can pre-configure the Preamble and C-RNTI to the terminal device. Specifically, the network device can configure the Preamble and C-RNTI through a handover command, so that the network device can configure the Preamble and C-RNTI according to the terminal device The received Msg1 identifies the terminal device.
  • the terminal device can use the two-step CFBA reference signal (such as synchronization signal block (Synchronization Signal Block, SSB) or channel state information reference signal (Channel State Information Reference Signal, CSI- RS)) perform measurement to determine a reference signal that meets the conditions, so that the reference signal can be used to initiate a two-step CFBA.
  • synchronization signal block Synchronization Signal Block
  • CSI- RS Channel State Information Reference Signal
  • the terminal device needs to fall back to the contention-based random access process.
  • the terminal device because the terminal device wanted to initiate non-competitive random access, the terminal device had already The data to be transmitted is packaged to generate a Media Access Control (MAC) protocol data unit (Protocol Data Unit, PDU) and stored in the buffer. Since the terminal device wants to initiate non-competitive random access, the buffer is The MAC PDU does not include the UE ID. In this case, when the terminal device reverts to the contention-based random access process, how the terminal device performs data transmission so that the network device can distinguish the terminal device so that the contention resolution is an issue. Problems that need to be solved urgently.
  • MAC Media Access Control
  • FIG. 4 is a schematic flowchart of a wireless communication method 200 according to an embodiment of the present application. As shown in FIG. 4, the method 200 may include the following content:
  • the terminal device measures at least one reference signal to determine a target reference signal used in the non-competitive two-step random access process.
  • the terminal device indicates that the multiplexing and packet grouping entity includes the cell radio network temporary identifier C-RNTI MAC control element CE and at least one media access control MAC sub-protocol data unit PDU to obtain a target MAC PDU, where
  • the at least one MAC sub-PDU includes a MAC service data unit SDU in a buffered MAC PDU, and the buffered MAC PDU does not include a C-RNTI MAC CE;
  • the terminal device initiates a contention-based random access process, carries the target MAC PDU in the physical uplink shared channel PUSCH, and sends it to the network device.
  • the buffered MAC PDU is generated and stored in the buffer before the terminal device initiates the non-competitive two-step random access process.
  • the MAC PDU is measuring the at least one reference signal. Generated before, or generated in the process of measuring the at least one reference signal, that is, before the terminal device determines to fall back to the contention-based follow-up process, the terminal device has generated the MAC for the data to be transmitted PDU, and stored in the buffer.
  • the data to be transmitted may not include the identification information of the UE, which is generated by the terminal device.
  • the MAC PDU may not include the identification information of the UE.
  • the C-RNTI MAC CE can be used to identify the terminal device, that is, the network device can identify the terminal device according to the C-RNTI MAC CE in the received PUSCH, so as to perform random access based on contention. Conflict resolution in the process.
  • the C-RNTI MAC CE can also be replaced with other identification information of the terminal device, for example, the UE ID, that is, the terminal device can also perform the buffered MAC PDU and other identification information of the terminal device. Regroup the packet to obtain the target MAC PDU, so that the network device can resolve the conflict.
  • the terminal device is configured with a resource for non-competitive two-step random access, denoted as a 2-step CFRA resource, and the 2-step CFRA resource may include:
  • a dedicated random access (Random Access Channel, RACH) resource in 2-step CFRA is used to send a random access preamble (i.e. preamble).
  • the RACH resource may include RACH Occasion (RO) Resources and reference signal resources, such as SSB or CSI-RS, where the RACH resource may also be referred to as a PRACH resource;
  • PUSCH resources dedicated to 2-step CFRA such as PUSCH opportunity (PUSCHOccasion, PO) resources, are used to send data to be transmitted, such as Msg3.
  • the 2-step CFRA resource may be configured by a network device.
  • the network device may configure the 2-step CFRA resource through a handover command (Handover command, HO command).
  • the The 2-step CFRA resource related configuration can be carried in the reconfiguration and synchronization information (ReconfigurationWithSync).
  • the terminal device may determine the target RACH resource for initiating 2-step CFRA in the configured 2-step CFRA resource.
  • the terminal device may measure at least one reference signal configured for 2-step CFRA, and determine the target RACH resource according to the measured value of the at least one reference signal, where the at least one reference signal It is at least one reference signal associated with the RACH resource in the 2-step CFRA resource.
  • the terminal device may determine the target RACH resource according to the measurement value of the at least one reference signal in combination with a first correspondence, where the first correspondence is a reference signal and a RACH resource The corresponding relationship.
  • the terminal device may determine a reference signal among the reference signals whose measurement values meet the condition, and determine the RACH resource corresponding to the reference signal as the target RACH resource.
  • condition may include that the measured value of the reference signal is greater than or equal to the first threshold.
  • the first threshold is pre-configured or configured by a network device.
  • the reference signal may be SSB or CSI-RS, that is, the first correspondence may be a correspondence between SSB and RACH resources, or may also be a correspondence between CSI-RS and RACH resources.
  • the adopted first threshold may be the same or different.
  • the measured value of the reference signal may refer to the reference signal receiving power (Reference Signal Receiving Power, RSRP), the reference signal receiving quality (Reference Signal Receiving Quality, RSRQ), or the carrier to interference noise ratio (Carrier to Noise Ratio). Interference plus Noise Ratio, SR-SINR), etc.
  • RSRP Reference Signal Receiving Power
  • RSRQ Reference Signal Receiving Quality
  • RSR-SINR carrier to Noise Ratio
  • SR-SINR Interference plus Noise Ratio
  • the reference signal and the RACH resource may have a one-to-one correspondence, or a many-to-one correspondence, or a one-to-many correspondence, that is, the SSB and the RACH resource may have a one-to-one correspondence. It can also be many-to-one, or one-to-many, or CSI-RS and RACH resources can be one-to-one, or many-to-one, or one-to-many.
  • the first correspondence is pre-configured or configured by a network device.
  • the first correspondence is configured by the network device through public RACH resource configuration information (RACH-ConfigCommon) and/or dedicated RACH resource configuration information (RACH-ConfigDedicated).
  • RACH-ConfigCommon public RACH resource configuration information
  • RACH-ConfigDedicated dedicated RACH resource configuration information
  • Case 1 The terminal device selects a reference signal that satisfies the condition from the at least one reference signal.
  • the terminal device may perform 2-step CFRA.
  • the terminal device may generate a MAC PDU according to the PO resource in the 2-step CFRA resource, and store it in the buffer.
  • the Hybrid Automatic Repeat reQuest (HARQ) entity (entity) of the terminal device may instruct the multiplexing and assembly entity (multiplexing and assembly) to generate the MAC PDU, and further, when satisfying After the conditional target reference signal, you can perform 2-step CFRA to transmit the buffered MAC PDU to the network device.
  • HARQ Hybrid Automatic Repeat reQuest
  • network equipment can distinguish UEs through Preamble, so Msg3 may not need to include identification information for distinguishing UEs, for example, C-RNTI, that is, the buffered MAC PDU may not include C-RNTI Media Access Control Element (MAC CE).
  • C-RNTI C-RNTI Media Access Control Control Element
  • the MAC PDU generated by the terminal device may also include a handover complete (Handover Complete, HO Complete) message and/or user plane data.
  • a handover complete Handover Complete, HO Complete
  • the terminal device may determine the target RACH resource in the contention-based RACH resource, and further initiate a contention-based random access process.
  • the contention-based RACH resource configured on the terminal device is recorded as the first candidate RACH resource, and the first candidate RACH resource can be used for the terminal device to initiate a contention-based follow-up process.
  • Case 2.1 If the first candidate RACH resource only includes the RACH resource (2-step CBRA resource) used for contention-based two-step random access, the terminal device can determine the target RACH resource in the 2-step CBRA resource, Further perform 2-step CBRA.
  • the first candidate RACH resource only includes the RACH resource used for contention-based two-step random access, which may refer to the uplink bandwidth part corresponding to the first active uplink BWP identifier (firstActiveUplinkBWP-Id) indicated in the HO command of the network device (Bandwidth Part, BWP) Only 2-step CBRA resources are configured, that is, 4-step CBRA resources are not configured. Of course, non-competitive random access resources can also be configured, which is not limited here.
  • Case 2.2 If the first candidate RACH resource only includes the RACH resource for four-step random access (4-step RACH resource), the terminal device can determine the target RACH resource in the 4-step RACH resource, and further perform the The competitive four-step random access process, namely 4-step CBRA.
  • the first candidate RACH resource only includes 4-step RACH resources, which may refer to the uplink BWP corresponding to the first active uplink BWP identifier (firstActiveUplinkBWP-Id) indicated in the HO command of the network device and only 4-step RACH is configured.
  • Resources that is, 2-step CBRA resources are not configured.
  • random access resources for non-competition can also be configured, which is not limited here.
  • the terminal device may first determine the target random access type before determining the target reference signal, and may further determine the target random access type according to the For the target random access type, the target RACH resource is determined from the configured contention-based RACH resources, and the corresponding random access process is further executed.
  • the target RACH resource can be determined in the configured 2-step CBRA resources, and the 2-step CBRA process can be initiated, or if the determined target random access If the input type is 4-step CBRA, the target RACH resource can be determined in the configured 4-step CBRA resource, and the 4-step CBRA process can be further initiated.
  • the terminal device may determine the target random access type according to the downlink path loss. For example, the terminal device may determine the target random access type according to the current downlink path loss and a preset threshold. Access type, as an example, if the current downlink path loss is greater than or equal to a preset threshold, the target random access type is determined to be 2-step CBRA, otherwise it is 4-step CBRA. That is, when the downlink path loss is large, selecting the contention-based two-step random access will help reduce the access delay. When the downlink path loss is small, selecting the contention-based four-step random access will help increase the probability of successful access. .
  • Access type as an example, if the current downlink path loss is greater than or equal to a preset threshold, the target random access type is determined to be 2-step CBRA, otherwise it is 4-step CBRA. That is, when the downlink path loss is large, selecting the contention-based two-step random access will help reduce the access delay. When the downlink path loss is small, selecting the contention-based four-step random access will help
  • the terminal device if it is determined to use contention-based random access, the terminal device indicates that the multiplexing and packaging entity includes C-RNTI MAC CE and at least one MAC sub (sub) PDU to obtain the target MAC PDU, wherein, the at least one MAC sub PDU includes a MAC service data unit SDU in a buffered MAC PDU, and the buffered MAC PDU does not include a C-RNTI MAC CE.
  • the terminal device may group the C-RNTI MAC CE and the buffered MAC PDU to obtain the target MAC PDU.
  • the HARQ entity of the terminal device may indicate multiplexing and grouping.
  • the entity (multiplexing and assembly entity) groups the C-RNTI MAC CE and the cached MAC PDU to obtain the target MAC PDU.
  • the terminal device can initiate a contention-based random access process and send the target MAC PDU to the network device. Since the MAC PDU includes the C-RNTI MAC CE used to distinguish UEs, the network device can be based on The C-RNTI MAC CE performs contention conflict resolution.
  • the terminal device may also determine the preamble group used by 2-step CBRA according to the size of the data to be transmitted (payload) (preamble group), where the data to be transmitted includes the buffered MAC PDU and the C-RNTI MAC CE.
  • the terminal device may receive an uplink grant (UL grant) from the RAR, and further re-transmit the uplink resources indicated by the uplink grant.
  • UL grant uplink grant
  • the target MAC PDU of the packet may be received from the RAR, and further re-transmit the uplink resources indicated by the uplink grant.
  • the target MAC PDU may also include the HO complete message That is to say, the HO complete message can be packaged into the target MAC PDU and transmitted through the uplink resources indicated by the uplink authorization; in other embodiments, if the remaining resources are insufficient to transmit the HO complete message, The HO complete message can also be transmitted through the first uplink authorization after successful random access.
  • the terminal device when the terminal device wants to initiate a two-step CFBA, but does not select a reference signal that meets the conditions, the terminal device can fall back to the contention-based random access procedure.
  • the data to be transmitted is packaged and placed in the buffer, and since the MAC PDU in the buffer does not include C-RNTI MAC CE, in this case, when the terminal device determines to initiate a contention-based random access process, the terminal device can indicate The multiplexing and packaging entity reassembles the cached MAC PDU and C-RNTI MAC CE, and can further send it to the network device through the uplink message in the random access process, so that the network device can perform the processing according to the C-RNTI MAC CE.
  • the resolution of competition when the terminal device wants to initiate a two-step CFBA, but does not select a reference signal that meets the conditions, the terminal device can fall back to the contention-based random access procedure.
  • the data to be transmitted is packaged and placed in the buffer, and since the MAC PDU in the buffer does not include
  • FIG. 5 shows a schematic block diagram of a terminal device 400 according to an embodiment of the present application.
  • the terminal device 400 includes:
  • the processing module 410 is configured to measure at least one reference signal to determine a target reference signal used in the non-competitive two-step random access process; if there is no reference signal that meets the condition in the at least one reference signal, the The terminal equipment determines to use a contention-based random access procedure; and
  • the indicating multiplexing and grouping entity includes the cell radio network temporary identifier C-RNTI MAC control element CE and at least one media access control MAC sub-protocol data unit PDU to obtain the target MAC PDU, wherein the at least one MAC sub-PDU Including the MAC service data unit SDU in the cached MAC PDU and the cached MAC PDU does not include the C-RNTI MAC CE;
  • the communication module 420 is configured to initiate a contention-based random access process, carry the target MAC PDU in the physical uplink shared channel PUSCH and send it to the network device.
  • the processing module 410 is further configured to:
  • the target RACH resource used for the contention-based random access process is determined, where the first candidate RACH resource is used for the contention-based random access process, and the target RACH resource is used for the contention-based random access process.
  • the resource is used to send the random access preamble.
  • the processing module 410 is specifically configured to:
  • the first candidate RACH resource only includes the RACH resource used for the four-step random access process, determine the target RACH resource in the RACH resource used for the four-step random access process;
  • the first candidate RACH resource only includes the RACH resource used for the contention-based two-step random access process, determining the target RACH resource from the RACH resource used for the contention-based two-step random access process;
  • the target random access type is determined, and the target random access The input type determines the target RACH resource.
  • the processing module 410 is further configured to:
  • the target random access type is a contention-based two-step random access process, and the RACH used for the contention-based two-step random access process
  • the target RACH resource is determined in the resource
  • the random access type is determined to be a four-step random access process, and the target RACH resource is determined from the RACH resources used for the four-step random access process.
  • the communication module 420 is further configured to:
  • the target RACH resource is a RACH resource used for a contention-based two-step random access process, initiate a contention-based two-step random access process;
  • the target RACH resource is a RACH resource used for a four-step random access procedure, a four-step random access procedure is initiated.
  • the processing module 410 is further configured to:
  • the preamble group of the contention-based two-step random access process determines the preamble group of the contention-based two-step random access process according to the size of the data to be transmitted, where the data to be transmitted includes the buffered MAC PDU and In the C-RNTI MAC CE, data to be transmitted of different sizes correspond to corresponding preamble groups.
  • the processing module 410 is further configured to:
  • the processing module 410 is further configured to:
  • the processing module 410 is specifically configured to:
  • the RACH resource corresponding to the reference signal meeting the condition in the first correspondence is determined as the target RACH resource.
  • the condition includes that the measured value of the reference signal is greater than or equal to a first threshold.
  • the above-mentioned communication module may be a communication interface or a transceiver, or an input/output interface of a communication chip or a system-on-chip.
  • the above-mentioned processing module may be one or more processors.
  • terminal device 400 may correspond to the terminal device in the method embodiment of the present application, and the above and other operations and/or functions of each unit in the terminal device 400 are to implement the method shown in FIG. 4, respectively.
  • the corresponding process of the terminal equipment in 200 will not be repeated here.
  • FIG. 6 is a schematic structural diagram of a communication device 600 provided by an embodiment of the present application.
  • the communication device 600 shown in FIG. 6 includes a processor 610, and the processor 610 can call and run a computer program from a memory to implement the method in the embodiment of the present application.
  • the communication device 600 may further include a memory 620.
  • the processor 610 may call and run a computer program from the memory 620 to implement the method in the embodiment of the present application.
  • the memory 620 may be a separate device independent of the processor 610, or may be integrated in the processor 610.
  • the communication device 600 may further include a transceiver 630, and the processor 610 may control the transceiver 630 to communicate with other devices. Specifically, it may send information or data to other devices, or receive other devices. Information or data sent by the device.
  • the transceiver 630 may include a transmitter and a receiver.
  • the transceiver 630 may further include an antenna, and the number of antennas may be one or more.
  • the communication device 600 may specifically be a network device of an embodiment of the present application, and the communication device 600 may implement the corresponding process implemented by the network device in each method of the embodiment of the present application. For the sake of brevity, it will not be repeated here. .
  • the communication device 600 may specifically be a mobile terminal/terminal device of an embodiment of the application, and the communication device 600 may implement the corresponding processes implemented by the mobile terminal/terminal device in each method of the embodiments of the application. For the sake of brevity , I won’t repeat it here.
  • FIG. 7 is a schematic structural diagram of a chip of an embodiment of the present application.
  • the chip 700 shown in FIG. 7 includes a processor 710, and the processor 710 can call and run a computer program from the memory to implement the method in the embodiment of the present application.
  • the chip 700 may further include a memory 720.
  • the processor 710 may call and run a computer program from the memory 720 to implement the method in the embodiment of the present application.
  • the memory 720 may be a separate device independent of the processor 710, or may be integrated in the processor 710.
  • the chip 700 may further include an input interface 730.
  • the processor 710 can control the input interface 730 to communicate with other devices or chips, and specifically, can obtain information or data sent by other devices or chips.
  • the chip 700 may further include an output interface 740.
  • the processor 710 can control the output interface 740 to communicate with other devices or chips, and specifically, can output information or data to other devices or chips.
  • the chip can be applied to the network device in the embodiment of the present application, and the chip can implement the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the chip can implement the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the chip can be applied to the mobile terminal/terminal device in the embodiment of the present application, and the chip can implement the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of the present application.
  • the chip can implement the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of the present application.
  • the chip can implement the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of the present application.
  • the chip mentioned in the embodiment of the present application may also be referred to as a system-level chip, a system-on-chip, a system-on-chip, or a system-on-chip.
  • the processor of the embodiment of the present application may be an integrated circuit chip with signal processing capability.
  • the steps of the foregoing method embodiments can be completed by hardware integrated logic circuits in the processor or instructions in the form of software.
  • the above-mentioned processor can be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (ASIC), a ready-made programmable gate array (Field Programmable Gate Array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP Digital Signal Processor
  • ASIC application specific integrated circuit
  • FPGA Field Programmable Gate Array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
  • the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), and electrically available Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (Random Access Memory, RAM), which is used as an external cache.
  • RAM random access memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • DDR SDRAM Double Data Rate Synchronous Dynamic Random Access Memory
  • Enhanced SDRAM, ESDRAM Enhanced Synchronous Dynamic Random Access Memory
  • Synchronous Link Dynamic Random Access Memory Synchronous Link Dynamic Random Access Memory
  • DR RAM Direct Rambus RAM
  • the memory in the embodiment of the present application may also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), Synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection Dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM) and so on. That is to say, the memory in the embodiments of the present application is intended to include, but is not limited to, these and any other suitable types of memory.
  • the embodiment of the present application also provides a computer-readable storage medium for storing computer programs.
  • the computer-readable storage medium can be applied to the network device in the embodiment of the present application, and the computer program causes the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the computer program causes the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the computer-readable storage medium can be applied to the mobile terminal/terminal device in the embodiment of the present application, and the computer program causes the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of the present application , For the sake of brevity, I won’t repeat it here.
  • the embodiments of the present application also provide a computer program product, including computer program instructions.
  • the computer program product can be applied to the network device in the embodiment of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the computer program instructions cause the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the computer program product can be applied to the mobile terminal/terminal device in the embodiment of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of the present application, For the sake of brevity, I will not repeat them here.
  • the embodiment of the present application also provides a computer program.
  • the computer program can be applied to the network device in the embodiment of the present application.
  • the computer program runs on the computer, it causes the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • I won’t repeat it here.
  • the computer program can be applied to the mobile terminal/terminal device in the embodiment of the present application.
  • the computer program runs on the computer, the computer executes each method in the embodiment of the present application. For the sake of brevity, the corresponding process will not be repeated here.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are merely illustrative, for example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of the present application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory,) ROM, random access memory (Random Access Memory, RAM), magnetic disks or optical disks and other media that can store program codes. .

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

Abstract

Procédé de communication sans fil et dispositif terminal. Le procédé consiste : à mesurer, au moyen d'un dispositif terminal, au moins un signal de référence afin de déterminer un signal de référence cible utilisé pour une procédure d'accès aléatoire en deux étapes sans contention ; si ledit signal référence ne comprend pas un signal de référence qui satisfait à une condition, à déterminer, au moyen du dispositif terminal, l'utilisation d'une procédure d'accès aléatoire fondée sur une contention ; à indiquer, au moyen du dispositif terminal, qu'une entité de multiplexage et de mise en paquets comprend un élément de commande (CE) MAC d'identifiant temporaire de réseau radio cellulaire (C-RNTI) et au moins une unité de données de sous-protocole (PDU) de commande d'accès au support (MAC) afin d'obtenir une PDU MAC cible, ladite sous-PDU MAC comprenant une unité de données de services (SDU) MAC dans une PDU MAC mise en cache, et la PDU MAC mise en cache ne comprenant pas le CE MAC C-RNTI ; et à initier, au moyen du dispositif terminal, une procédure d'accès aléatoire fondée sur une contention, et à faire en sorte que la PDU MAC cible soit transportée dans un canal partagé de liaison montante physique (PUSCH) et à l'envoyer à un dispositif de réseau.
PCT/CN2019/112861 2019-10-23 2019-10-23 Procédé de communication sans fil et dispositif terminal WO2021077343A1 (fr)

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