Random access method and apparatus, device, and storage medium

Abstract

A random access method and apparatus, a device, and a storage medium, relating to the technical field of communications. The method is executed by a terminal device. The method comprises: receiving first information, the first information being used for configuring one or more frequency domain units, and the frequency domain units being used for a terminal device to receive and / or send a random access message (610). By flexibly scheduling and transmitting the random access message between the plurality of frequency domain units, a network device can make full use of spectrum resources, thereby improving the spectrum resource utilization rate. By transmitting the random access message on different frequency domain units, the success rate of random access message transmission can also be improved, thereby reducing the probability of transmission failure.

Description

Random access method, device, apparatus and storage medium TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of communication technology, in particular to a random access method, device, apparatus and storage medium. BACKGROUND

[0002] With the development of communication technology, based on the analysis of 6G (Sixth Generation, the sixth generation of mobile communication technology) spectrum demand and 4G / 5G carrier aggregation technology, the 6G control plane needs to continue to evolve on the basis of the traditional spectrum aggregation framework, support efficient and flexible spectrum aggregation, and improve spectrum utilization. From the perspective of sustainability, 6G carrier aggregation enhancement needs to consider terminal and network energy saving under multi-carrier / bandwidth configuration. From the perspective of scalability, 6G carrier aggregation enhancement needs to consider supporting aggregation of more carriers / bandwidth, realizing flexible configuration, scheduling and switching of uplink / downlink transmission resources. How to realize the random access process under multi-carrier / bandwidth needs further discussion and research.

[0003] SUMMARY

[0004] Embodiments of the present application provide a random access method, device, apparatus and storage medium. The technical solutions provided by the embodiments of the present application are as follows:

[0005] According to an aspect of the embodiments of the present application, a random access method is provided, the method is executed by a terminal device, and the method comprises:

[0006] receiving first information, the first information being used for configuring one or more frequency domain units, the frequency domain units being used for the terminal device to receive and / or send random access messages.

[0007] According to an aspect of the embodiments of the present application, a random access method is provided, the method is executed by a network device, and the method comprises:

[0008] sending first information, the first information being used for configuring one or more frequency domain units, the frequency domain units being used for the terminal device to receive and / or send random access messages.

[0009] According to an aspect of the embodiments of the present application, a random access device is provided, the device comprises:

[0010] a receiving module, configured to receive first information, the first information being used for configuring one or more frequency domain units, the frequency domain units being used for the terminal device to receive and / or send random access messages.

[0011] According to an aspect of the embodiments of the present application, a random access device is provided, the device comprises:

[0012] The sending module is configured to send first information, where the first information is used to configure one or more frequency domain units, and the frequency domain units are used for the terminal device to receive and / or send a random access message.

[0013] According to an aspect of some embodiments of the present application, a communication device is provided, which includes a processor and a memory, the memory storing a computer program, and the processor executes the computer program to implement the random access method described above. The communication device is a terminal device, or the communication device is a network device.

[0014] According to an aspect of some embodiments of the present application, a computer readable storage medium is provided, which stores a computer program, and the computer program is used to be executed by a processor to implement the random access method described above.

[0015] According to an aspect of some embodiments of the present application, a chip is provided, which includes a programmable logic circuit and / or program instructions, and when the chip is running, the chip is used to implement the random access method described above.

[0016] According to an aspect of some embodiments of the present application, a computer program product is provided, which includes computer instructions stored in a computer readable storage medium, and a processor reads and executes the computer instructions from the computer readable storage medium to implement the random access method described above.

[0017] The technical solutions provided by the embodiments of the present application can include the following beneficial effects:

[0018] By flexibly scheduling and transmitting the random access message among the plurality of frequency domain units, the network device can fully utilize the frequency spectrum resources, and improve the frequency spectrum resource utilization rate. By transmitting the random access message on different frequency domain units, the success rate of transmitting the random access message can also be improved, and the probability of transmission failure can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] FIG. 1 is a schematic diagram of a network architecture provided by an embodiment of the present application;

[0020] FIG. 2 is a schematic diagram of a four-step random access process provided by an embodiment of the present application;

[0021] FIG. 3 is a schematic diagram of a two-step random access process based on contention provided by an embodiment of the present application;

[0022] FIG. 4 is a schematic diagram of a two-step random access process falling back to a four-step random access process provided by an embodiment of the present application;

[0023] FIG. 5 is a schematic diagram of a non-contention based two-step random access procedure according to an embodiment of the present application;

[0024] FIG. 6 is a flowchart of a random access method according to an embodiment of the present application;

[0025] FIG. 7 is a block diagram of a random access apparatus according to an embodiment of the present application;

[0026] FIG. 8 is a block diagram of a random access apparatus according to another embodiment of the present application;

[0027] FIG. 9 is a schematic diagram of a communication device according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] For the purpose of making the object, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0029] The network architecture and service scenarios described in the embodiments of the present application are for more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. It can be known by those skilled in the art that, with the evolution of network architecture and the appearance of new service scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0030] Please refer to FIG. 1, which shows a schematic diagram of a network architecture 100 according to an embodiment of the present application. The network architecture 100 can include a terminal device 10, an access network device 20 and a core network element 30.

[0031] The terminal device 10 can refer to a UE (User Equipment), a STA (Station), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile, a remote station, a remote terminal, a mobile device, a wireless communication device, a user agent, or a user equipment. In some embodiments, the terminal device 10 can also be a cellular phone, a cordless phone, a SIP (Session Initiation Protocol) phone, a WLL (Wireless Local Loop) station, a PDA (Personal Digital Assistant), a handheld device with wireless communication function, a computing device, or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in a 5GS (5th Generation System), or a terminal device in a future evolved PLMN (Public Land Mobile Network), etc., and the embodiments of the present application are not limited thereto. For the convenience of description, the above-mentioned devices are collectively referred to as terminal devices. The number of terminal devices 10 is usually multiple, and one or more terminal devices 10 can be distributed in a cell managed by each access network device 20. The terminal device can also be simply referred to as a terminal or a UE, and those skilled in the art can understand its meaning.

[0032] The access network device 20 is a device deployed in an access network to provide wireless communication functions for the terminal device 10. The access network device 20 can include various forms of macro base stations, micro base stations, relay stations, APs (Access Points), and the like. In systems using different wireless access technologies, the names of devices with access network device functions can be different, for example, in a 5G NR (New Radio) system, it is called gNodeB or gNB (Next Generation Node B). With the evolution of communication technology, the name of the "access network device" can change. For ease of description, in the embodiments of the present application, the above-mentioned devices that provide wireless communication functions for the terminal device 10 are collectively referred to as access network devices. In some embodiments, through the access network device 20, a communication relationship can be established between the terminal device 10 and the core network element 30. Exemplarily, in an LTE system, the access network device 20 can be an EUTRAN (Evolved Universal Terrestrial Radio Access Network) or one or more eNodeBs in the EUTRAN; in a 5G NR system, the access network device 20 can be a RAN (Radio Access Network) or one or more gNBs in the RAN. In the embodiments of the present application, the "network device" refers to the access network device 20, such as a base station, unless otherwise specified.

[0033] The core network element 30 is a network element deployed in the core network, and the main functions of the core network element 30 are to provide user connection, manage users, and complete bearer for services, and provide an interface to external networks as a bearer network. For example, the core network element in a 5G NR system can include AMF (Access and Mobility Management Function) entities, UPF (User Plane Function) entities, and SMF (Session Management Function) entities.

[0034] In some embodiments, the access network device 20 and the core network element 30 communicate with each other through some air interface technology, such as the NG interface in the 5G NR system. The access network device 20 and the terminal device 10 communicate with each other through some air interface technology, such as the Uu interface.

[0035] The "5G NR system" in the embodiments of the present application can also be referred to as a 5G system or an NR system, but those skilled in the art can understand its meaning. The technical solutions described in the embodiments of the present application can be applicable to an LTE system, a 5G NR system, an evolved system (such as a B5G (Beyound 5G) system, a 6G system (6th Generation System, 6th generation mobile communication system)) after the 5G NR system, and other communication systems such as an NB-IoT (Narrow Band Internet of Things, Narrow Band Internet of Things) system, and the present application does not limit this.

[0036] In the embodiments of the present application, a network device can provide services for a cell, and a terminal device communicates with the network device through a transmission resource (for example, a frequency domain resource, or a spectrum resource) on a carrier used by the cell. The cell can be a cell corresponding to the network device (for example, a base station), and the cell can belong to a macro base station or a base station corresponding to a small cell (Small cell). The small cell can include a metro cell, a micro cell, a pico cell, a femto cell, and the like. These small cells have the characteristics of small coverage and low transmit power, and are suitable for providing high-speed data transmission services.

[0037] Before introducing the technical solutions of the present application, some related technical knowledge involved in the present application will be introduced and explained. The following related technologies can be combined with the technical solutions of the embodiments of the present application in any way, and all belong to the protection scope of the embodiments of the present application. The embodiments of the present application include at least part of the following content.

[0038] 1. NR four-step random access process

[0039] The random access process is mainly initiated by the PDCCH (Physical Downlink Control Channel, Physical Downlink Control Channel) order, the MAC (Medium Access Control, Medium Access Control) entity itself or the RRC (Radio Resource Control, Radio Resource Control) layer, and is triggered by the following events:

[0040] - Establishing a wireless connection when the UE initially accesses: the UE from the RRC_IDLE (RRC idle state) state to the RRC_CONNECTED (RRC connected state) state;

[0041] - RRC connection re-establishment procedure: in order for the UE to re-establish the radio connection after a radio link failure;

[0042] - In RRC_CONNECTED state, or RRC_INACTIVE state, there is an ongoing SDT procedure, UL or DL data arrives, and the UL is in out-of-sync state;

[0043] - In RRC_CONNECTED state, or RRC_INACTIVE state, there is an ongoing SDT procedure, UL data arrives, and the UE has no PUCCH resource for sending SR;

[0044] - SR failure: PUCCH resource is re-acquired through random access procedure;

[0045] - Explicit synchronization reconfiguration request from RRC (e.g. handover);

[0046] - RRC connection resume procedure: UE transitions from RRC_INACTIVE state to RRC_CONNECTED state;

[0047] - Time synchronization is established for Primary TAG or Secondary TAG;

[0048] - Request other SI: UE requests some system messages that are not broadcasted in the NR system on demand through random access procedure;

[0049] - Beam failure recovery;

[0050] - Persistent UL LBT failure on SpCell (Secondary Primary Cell);

[0051] - SDT in RRC_INACTIVE state;

[0052] - Random access procedure is needed for positioning purposes in RRC_CONNECTED state, e.g. when UE positioning requires TA;

[0053] - UL synchronization is established with LTM candidate cell in advance;

[0054] - RACH (Random Access Channel)-based LTM cell switching.

[0055] In NR, the following two random access methods are mainly supported, i.e., contention-based random access and non-contention-based random access, as shown in FIG. 2.

[0056] The contention-based random access procedure shown in FIG. 2 is divided into 4 steps, and the non-contention-based random access procedure is divided into 2 steps. The detailed steps are as follows:

[0057] 1. The terminal device sends Msg1 to the network device

[0058] Before sending Msg1, the UE needs to measure the quality of the reference signal, so as to select a relatively better reference signal and the corresponding PRACH (Physical Random Access Channel) resource and preamble. If it is a non-contention-based random access, the PRACH resource and preamble can be specified by the base station. The base station can estimate the uplink timing and the grant size required for the terminal device to transmit Msg3 based on the preamble.

[0059] Msg1 Repetition: To improve the uplink coverage of NR system FR(Frequency Range)1 and FR2 bands, for the four-step random access procedure, both NUL(Non-UL Synchronization Signal) and SUL(Supplementary Uplink) support MSG1 repetition using the same beam. For CBRA(Contenion-Based Random Access), the network device broadcasts separate RSRP thresholds for different repetition numbers. The UE performs MSG1 repetition through separate RACH resources, which are different from the RACH resources that do not support MSG1 repetition (i.e., legacy RACH resources). For CFRA(Contenion-Free Random Access) triggered by ReconfigurationWithSync, the network device explicitly indicates the MSG1 repetition number. In the RACH resource set associated with the same feature, MSG1 repetition supports fallback from a lower repetition number to a higher number. For MSG1-based SI request or if the UE has fallen back from CFRA to CBRA, MSG1 repetition does not support fallback from a lower number to a higher number. Fallback from CFRA with MSG1 repetition to 4-step CBRA with MSG1 repetition is supported, using the same MSG1 repetition number as CFRA.

[0060] 2. The network device sends a RAR(Random Access Response) to the terminal device

[0061] After the terminal device sends Msg1, a random access response time window ra-ResponseWindow is started, and the RA-RNTI(Random Access Radio Network Temporary Identifier) scrambled PDCCH is monitored in the window. The calculation of RA-RNTI is as follows: RA-RNTI = 1 + s_id + 14 × t_id + 14 × 80 × f_id + 14 × 80 × 8 × ul_carrier_id

[0062] That is, RA-RNTI is related to the PRACH time-frequency resource used by the UE to send Msg1.

[0063] After the terminal device successfully receives the PDCCH scrambled by the RA-RNTI, the terminal device can obtain the PDSCH scheduled by the PDCCH, which contains the RAR (Random Access Response). This step is called Msg2. The RAR specifically contains the following information:

[0064] The subheader of the RAR contains the BI, which is used to indicate the backoff time for retransmitting Msg1;

[0065] The RAPID (Random Access Preamble Identifier) in the RAR: the network device responds to the received preamble index;

[0066] The payload of the RAR contains the TAC (Timing Advance Command), which is used to adjust the uplink timing;

[0067] UL grant: used to schedule the uplink resource indication of Msg3;

[0068] Temporary C-RNTI (Cell Radio Network Temporary Identifier): used to scramble the PDCCH of Msg4 (initial access).

[0069] If the terminal device receives the PDCCH scrambled by the RA-RNTI, and the RAR contains the preamble index sent by itself, the terminal device considers that it has successfully received the random access response.

[0070] For non-contention-based random access, the terminal device considers that the random access process is completed after successfully receiving Msg2. For contention-based random access, after successfully receiving Msg2, the terminal device still needs to continue transmitting Msg3 and receiving Msg4.

[0071] 3. The terminal device transmits Msg3 on the resource scheduled by the network device

[0072] In the process of sending Msg3, the UE will use the TA information provided in Msg2 to adjust its uplink sending time, ensuring time synchronization with the base station. In addition, the UE will construct Msg3 according to the indication in the UL Grant, and then send it on the specified PUSCH resource. The PUSCH (Physical Uplink Shared Channel) resource for the initial transmission of Msg3 is scheduled by the UL grant provided in Msg2 RAR, while the PUSCH resource for the retransmission of Msg3 (HARQ retransmission) is scheduled by the DCI Format 0_0 scrambled by TC-RNTI. Msg3 is mainly used to inform the network device that the RACH process is triggered by what event, and carries the UE identification for subsequent contention conflict resolution. For example, if it is an initial access random process, the UE ID (including ng-5G-S-TMSI-Part1, etc.) and establishment cause will be carried in Msg3 through the RRCSetupRequest (RRC configuration request) message; if it is RRC reestablishment, the connected state UE identification (including C-RNTI, etc.) and reestablishment cause will be carried through the RRCReestablishmentRequest (RRC reestablishment request) message.

[0073] Msg3 Repetition: In order to improve the coverage of NR uplink in FR1 and FR2, both NUL and SUL support the repetition of MSG3 in multiple slots, which is applicable to CBRA with 4-step RA type. If the RSRP (Reference Signal Received Power) measurement result of the downlink path loss reference signal is lower than a separate threshold value introduced for the terminal device to request Msg3 PUSCH repetition transmission, the UE needs to request the base station for the repetition transmission of Msg3 PUSCH. When the terminal device sends Msg1, it implicitly indicates to the base station to request the repetition transmission of Msg3 PUSCH by selecting specific PRACH resources. These specific PRACH resources are configured by the network device, which are different from the PRACH resources used by the traditional terminal device. For the base station, when it detects that the terminal device uses specific PRACH resources to send Msg1, it determines that the terminal device that sends the Msg1 requests the repetition transmission of Msg3 PUSCH. If the BWP (Bandwidth Part) is only configured with RACH resources for Msg3 repetition transmission, the UE does not need to judge the RSRP of the downlink path loss reference.

[0074] 4. Network device sends Msg4 to terminal device

[0075] After the terminal device sends Msg3 (including initial transmission and HARQ (Hybrid Automatic Repeat Request) retransmission of Msg3), a contention resolution timer ra-ContentionResolutionTimer is started or restarted, and the UE monitors PDCCH to receive Msg4 within the time period. Msg4 has two functions, one is for contention resolution, and the second is that the network device transmits an RRC configuration message such as RRCSetup and RRCReestablishment to the terminal device. There are two ways to resolve contention: one is that if the UE carries C-RNTI in Msg3, Msg4 is scheduled by PDCCH scrambled by C-RNTI, and the resolution of the conflict is that if the UE receives PDCCH scheduling scrambled by C-RNTI and the corresponding PDSCH, the conflict resolution is completed, and the ra-ContentionResolutionTimer is stopped. The other is that if the UE does not carry C-RNTI in Msg3, such as initial access, Msg4 is scheduled by PDCCH scrambled by TC-RNTI, and when the MAC PDU (Protocol Data Unit) is successfully decoded, the ra-ContentionResolutionTimer is stopped, and the resolution of the conflict is that the UE receives the PDSCH of Msg4 and completes it by matching the CCCH SDU (Common Control Channel Service Data Unit).

[0076] Msg4 HARQ-ACK repetition: To improve NR uplink coverage in NTN (Non-terrestrial network), NTN supports Msg4 HARQ-ACK repetition. The PUCCH repetition of Msg4 HARQ-ACK is indicated by system information or dynamically indicated by DCI when multiple repetition factors are configured in system information. The UE needs to report the PUCCH repetition capability of Msg4 HARQ-ACK in Msg3 PUSCH; if Msg4 HARQ-ACK repetition is performed, PUCCH repetition applies to all PUCCH transmissions before dedicated PUCCH resources are provided.

[0077] 2、NR two-step random access process

[0078] Two-step random access procedure is introduced in related art, which can reduce latency while reducing signaling overhead. MsgA in two-step random access contains preamble transmitted on PRACH and payload information transmitted on PUSCH, which can correspond to Msg1 and Msg3 in four-step contention-based random access procedure. After MsgA transmission, the terminal device listens to the response of the network device side, called MsgB, within the configured window msgB-ResponseWindow, which can correspond to Msg2 and Msg4 in the four-step contention-based random access procedure.

[0079] Referring to the design of four-step contention-based random access, there are different MsgB listening behaviors for UEs in different RRC connection states. Generally speaking, when the UE is in RRC connected state, that is, the UE carries C-RNTI in MsgA, the UE will listen to the PDCCH scrambled by C-RNTI and the PDCCH scrambled by MsgB-RNTI. When the UE is in RRC idle state or inactive state, there is no specific RNTI, so the UE carries RRC message as an identifier in MsgA and listens to the PDCCH scrambled by MsgB-RNTI. The calculation of MsgB-RNTI refers to the design of RA-RNTI used to schedule RAR in the four-step random access procedure, that is, based on the time-frequency location of the random access resource selected by the UE when transmitting MsgA. Considering that two-step random access resources and four-step random access resources will be reused, in order to avoid confusion of different types of UEs when receiving network device feedback, MsgB-RNTI increases a bias on the basis of RA-RNTI.

[0080] For MsgB message, as mentioned before, it corresponds to Msg2 and Msg4 in contention-based four-step random access procedure, so its design needs to consider the functions of Msg2 and Msg4. On one hand, MsgB needs to support contention resolution, such as contention resolution identifier and RRC message for corresponding UE. On the other hand, MsgB also needs to support the content of Msg2, such as random backoff indication and the content in RAR. The reason is mainly that, for the network device side, when receiving and decoding MsgA, one possibility is that the network device can successfully decode all the contents of MsgA, such as preamble and payload message of MsgA, so that the network device can send a contention resolution message through MsgB, that is, the function of Msg4. Another possibility is that the network device only decodes the preamble in MsgA and does not decode the payload in MsgA. For this case, the network device does not identify the UE, but the network device can still send a fallback indication (corresponding to the function of Msg2) through MsgB to instruct the UE to continue to send Msg3 without retransmitting MsgA. If the network device sends an indication of successful contention resolution in MsgB, the terminal device ends the random access procedure, as shown in FIG. 3; if a fallback indication is received in MsgB, the terminal device performs Msg3 transmission and listens to the contention resolution result, as shown in FIG. 4. If the contention resolution is not successful after Msg3 transmission, the terminal device continues to transmit MsgA. For non-contention-based two-step random access, as shown in FIG. 5.

[0081] After the introduction of two-step random access, if the network device configures MsgA resources for two-step random access and RACH resources for four-step random access at the same time, for contention-based random access, the UE needs to select the random access type before performing random access. The current conclusion of NR standardization is that the UE selects the random access type based on RSRP measurement. When the RSRP measured by the UE is higher than the RSRP threshold configured by the network device, the UE uses two-step random access; otherwise, the UE uses four-step random access.

[0082] 3. Random access and carrier aggregation

[0083] When the network device configures carrier aggregation for the UE, there are the following multi-carrier transmission cases in the RACH procedure:

[0084] For CBRA with 4-step RA type, the first three steps (Msg1 / 2 / 3) always occur on the PCell, while the fourth step contention resolution (Msg4) can be cross-scheduled by the PCell, supporting transmission on the PCell or SCell;

[0085] - For CFRA with 4-step RA type, if CFRA is initiated on PCell, all three steps (0, 1, 2) of CFRA happen on PCell. CFRA on SCell can only be initiated by gNB to establish time synchronization of Secondary TAG: the procedure is initiated by gNB by sending PDCCH order on one activated SCell of Secondary TAG (step 0), RACH preamble transmission (Msg1) happens on the indicated SCell, RAR (Msg2) happens on PCell;

[0086] - For 2-step RA type, only the last step contention resolution supports cross-scheduling by PCell to be transmitted on PCell or SCell, the rest all happen on PCell.

[0087] Based on the analysis of the spectrum demand of 6G and the existing 4G / 5G carrier aggregation technology, the control plane of 6G needs to continue to evolve on the basis of the traditional spectrum aggregation framework, support efficient and flexible spectrum aggregation, and improve spectrum utilization. From the perspective of sustainability, the carrier aggregation enhancement of 6G needs to consider the energy saving problem of terminal equipment and network equipment under multi-carrier / bandwidth configuration. From the perspective of scalability, the carrier aggregation enhancement of 6G needs to consider supporting the aggregation of more carriers / bandwidth, realizing the flexible configuration, scheduling and switching of uplink / downlink transmission resources.

[0088] In 5G, the existing carrier aggregation technology usually relies on the concept of primary serving cell (PCell) and secondary serving cell (SCell). Under this framework, the scheduling and transmission of different carriers are limited by the role of the cell, and cannot be flexibly configured and switched across carriers. In the carrier aggregation enhancement of 6G, in order to realize flexible carrier resource scheduling and configuration (such as flexible association of carriers and related control channels), it can be considered to support uplink and downlink decoupling in spectrum aggregation (such as aggregation of UL only carrier); consider weakening the concept of PCell and SCell, support dynamic conversion of "PCell" and "SCell"; further, it can also be considered to unbind the current cell and carrier, i.e. no longer limit each carrier (carrier) to be modeled as a cell.

[0089] In 5G, due to the concept of PCell and SCell, although a certain degree of cross-carrier scheduling is supported, in the existing RACH process of 5G, the transmission of Msg1 / 2 / 3 / 4 is still constrained by the roles of PCell and SCell, and cannot be flexibly transmitted on multiple carriers.

[0090] In addition, retransmission or repetition in the RACH process, including between the initial transmission of Msg3 and HARQ retransmission, and between different repetitions of Msg1 / Msg3, are limited to the same cell and do not support cross-carrier retransmission or repetition.

[0091] Please refer to Figure 6, which shows a flowchart of a random access method provided in an embodiment of this application. The method is performed by a terminal device. The method includes the following step 610.

[0092] Step 610: The terminal device receives first information, which is used to configure one or more frequency domain units. The frequency domain units are used by the terminal device to receive and / or send random access messages.

[0093] Accordingly, the network device sends the first message.

[0094] Random access messages refer to messages sent during the random access process. For example, in a four-step random access process, the random access messages include Msg1, Msg2, Msg3, and Msg4. In a two-step random access process, the random access messages include MsgA and MsgB.

[0095] Frequency domain units are used to describe cell and / or frequency band range. Optionally, a frequency domain unit can be any of the following: cell, carrier, frequency band, sub-band, bandwidth, or frequency band. For example, a frequency domain unit can be implemented as a cell, or BW (BandWidth), or CC (Component Carrier).

[0096] 1. The relationship between random access messages and frequency domain elements

[0097] Random access messages include several types. Optionally, random access messages include one or more of the following messages: a first random access message, a second random access message, a third random access message, and a fourth random access message.

[0098] For example, in the four-step random access process, the first random access message is Msg1, the second random access message is Msg2, the third random access message is Msg3, and the fourth random access message is Msg4.

[0099] For example, in a two-step random access process, the first random access message is MsgA and the second random access message is MsgB.

[0100] Optionally, the frequency domain unit is configured for one or more random access messages. Illustratively, each random access message corresponds to one frequency domain unit. Illustratively, a plurality of random access messages correspond to one or more frequency domain units.

[0101] Optionally, the frequency domain unit is configured for one or more types of random access messages. Optionally, each type of random access message corresponds to one or more frequency domain units. Illustratively, a first random access message has an association with one or more frequency domain units, and a second random access message has an association with one or more frequency domain units.

[0102] Optionally, the first information is further used to indicate the frequency domain units associated with different types of random access messages respectively.

[0103] The frequency domain unit is used for the terminal device to receive and / or transmit a random access message. For example, the frequency domain unit is used for the terminal device to receive a RAR or a PDSCH. For example, the frequency domain unit is used for the terminal device to transmit a PRACH or a PUSCH.

[0104] Optionally, the one or more first frequency band resources are configured by the network device. Optionally, the network device dynamically allocates the frequency domain unit for the terminal device based on network load, spectrum resource, location of the terminal device, and the like. In this way, the network device can flexibly manage the spectrum resource to improve spectrum utilization.

[0105] 2. The first information

[0106] Optionally, the first information is used to semi-statically configure the one or more frequency domain units. Illustratively, the first information is a broadcast message or dedicated signaling. For example, the first information is used to configure the frequency domain unit associated with a first random access message, and the first information is a system message. The first random access message is used for at least transmitting a random access preamble. For example, the first information is used to configure the frequency domain units associated with the first random access message and a second random access message respectively, and the first information is an RRC reconfiguration message.

[0107] Optionally, the second information is used to dynamically indicate the one or more frequency domain units. Illustratively, the second information is used to schedule a random access message. Illustratively, the second information is used to schedule a second random access message, and the second information is a DCI. For example, the second information is used to schedule a Msg2, and the second information is a DCI. Illustratively, the second information is used to schedule a third random access message, and the second information is the second random access message. For example, the second information is used to schedule a Msg3, and the second information is the Msg2.

[0108] The technical scheme provided by the embodiments of the present application can flexibly schedule and transmit random access messages among multiple frequency domain units, so that the network device can fully utilize the spectrum resources and improve the spectrum resource utilization. By transmitting random access messages on different frequency domain units, the success rate of random access message transmission can be improved, and the probability of transmission failure can be reduced.

[0109] Next, the transmission of different types of random access messages on different frequency domain units and the transmission of two different random access messages on different frequency domain units will be described.

[0110] I. Flexibly configuring the frequency domain unit associated with the random access message

[0111] In one example, the frequency domain units corresponding to different types of random access messages are different. For example, the frequency domain units corresponding to the first random access message and the second random access message are different. For example, the frequency domain units corresponding to Msg1 and Msg2 are different, for example, Msg1 is transmitted on carrier 1 and Msg2 is transmitted on carrier 2.

[0112] In another example, the frequency domain units corresponding to at least two different random access messages are different. For example, the first random access message is repeatedly transmitted on different frequency domain units. For example, the initial transmission and retransmission of the first random access message are transmitted on different frequency domain units. For example, Msg1 is repeatedly transmitted on carriers 1-3. For example, Msg1 is initially transmitted on carrier 1 and retransmitted on carrier 2.

[0113] 1. Msg1 transmission

[0114] Optionally, the method further includes the following step 620 (not shown in the figure).

[0115] Step 620, the terminal device transmits the first random access message on at least one frequency domain unit, and the first random access message is at least used for transmitting a random access preamble.

[0116] Correspondingly, the network device receives the first random access message on at least one frequency domain unit.

[0117] In one example, the first random access message is Msg1.

[0118] Optionally, the at least one frequency domain unit is selected from one or more frequency domain units indicated by the first information. Optionally, the at least one frequency domain unit is selected from one or more frequency domain units based on the first condition.

[0119] Optionally, the at least one frequency domain unit satisfies one or more of the following conditions:

[0120] The channel quality of the at least one frequency domain unit exceeds a first threshold value;

[0121] The at least one frequency domain unit has an association relationship with the terminal device.

[0122] The first threshold value can be predefined or preconfigured, or indicated by the network device, or determined by the terminal device based on its own implementation. The first threshold value is a threshold value reflecting the channel quality of the frequency domain unit. Exemplarily, the first threshold value can be an RSRP threshold value, an RSRQ (Reference Signal Received Quality) threshold value, an SINR (Signal to Interference plus Noise Ratio) threshold value, etc., which are not limited in the present application.

[0123] Optionally, the terminal device selects at least one frequency domain unit with the best channel quality based on the channel quality of one or more frequency domain units to send the first random access message, which can effectively improve the transmission success rate of the first random access message.

[0124] Optionally, different terminal devices are distributed to different frequency domain units according to certain rules, and the association relationship between the terminal device and the at least one frequency domain unit is indicated in the first information. Exemplarily, the terminal devices are allocated to different frequency domain units according to the identification information of the terminal devices. For example, different terminal devices are allocated to different frequency domain units according to the ID (Identity Document) of the terminal devices, which can effectively balance the load.

[0125] 2, Msg2 transmission

[0126] Optionally, after sending the first random access message, the terminal device receives a second random access message sent by the network device. Optionally, the terminal device receives the second random access message on the frequency domain unit corresponding to the second random access message indicated by the first information.

[0127] Optionally, the correspondence between the specific random access message and the specific frequency domain unit is indicated by the second information. Optionally, when there are multiple frequency domain units, the frequency domain unit actually transmitting the random access message is dynamically indicated by the second information. Exemplarily, the frequency domain unit actually transmitting the second random access message is dynamically indicated by the second information.

[0128] Optionally, the second information includes identification information of the random access message and / or identification information of the frequency domain unit. Optionally, the second information is used to indicate the identification information of the frequency domain unit actually transmitting the random access message. Exemplarily, the second information is used to indicate the ID of the frequency domain unit actually transmitting the random access message.

[0129] Optionally, the second information is used for scheduling the random access message.

[0130] In one example, in the case that the random access message is a random access message received by the terminal device, the second information is a DCI (Downlink Control Information). Illustratively, in the case that the random access message is Msg2, the second information is a first DCI. Illustratively, in the case that the random access message is Msg4, the second information is a second DCI.

[0131] In another example, in the case that the random access message is a random access message sent by the terminal device, the second information is a random access message received by the terminal device before sending the random access message. Illustratively, in the case that the random access message is Msg3, the second information is Msg2.

[0132] 3. Msg3 transmission

[0133] Optionally, after receiving the second random access message, the terminal device sends a third random access message. Correspondingly, the network device receives the third random access message.

[0134] Optionally, the related information of the third random access message is indicated by the second random access message. Illustratively, in the case that there are multiple frequency domain units, the frequency domain unit actually sending the third random access message is indicated by the second random access message. Illustratively, the third random access message is Msg3, and the second random access message is Msg2.

[0135] 4. Msg4 transmission

[0136] Optionally, after sending the third random access message, the terminal device receives a fourth random access message from the network device. Illustratively, the third random access message is Msg3, and the fourth random access message is Msg4.

[0137] 5. Take the four-step random access procedure as an example

[0138] The UE listens to the scheduling channel scheduling Msg2 / 3 / 4 and / or sends Msg1 / 3 or receives MSG2 / 4 on the corresponding Cell / BW / CC according to the network device configuration. The specific steps are as follows:

[0139] - Transmission of MSG1: the UE transmits a random access preamble (Preamble) on the configured Cell / BW / CC.

[0140] Optionally, the Cell / BW / CC used for Msg1 transmission can be one or more.

[0141] Optionally, each Msg1 Cell / BW / CC is configured with an RSRP threshold, and the UE can select the optimal Cell / BW / CC to send the preamble through downlink measurement, which can improve the success rate of MSG1 transmission.

[0142] Optionally, different UEs can be distributed to different Cell / BW / CCs according to certain rules based on UE ID, which can balance the load.

[0143] -MSG2 reception: the network device receives the random access response (RAR) on the configured Msg2 Cell / BW / CC. The UE receives the RAR on the PDSCH resource specified by the DCI format on the configured Msg2 Cell / BW / CC after monitoring the DCI format scrambled by the RA-RNTI in the scheduling channel PDCCH scheduling Msg2. The RAR contains information such as RAPID, TA command, UL grant, and temporary C-RNTI, which is used by the UE for subsequent transmission.

[0144] Optionally, if there are multiple configured Msg2 Cell / BW / CCs, the Msg2 Cell / BW / CC can be dynamically indicated by DCI, such as by Cell / BW / CC ID.

[0145] -MSG3 transmission: the UE transmits MSG3 on the PUSCH resource specified by the UL grant on the configured Msg3 Cell / BW / CC using the UL grant provided in MSG2.

[0146] Optionally, if there are multiple configured Msg3 Cell / BW / CCs, the Msg3 Cell / BW / CC can be dynamically indicated by the UL grant provided in MSG2.

[0147] -MSG4 reception: in the contention resolution process, the network device schedules the UE to receive Msg4 on the PDSCH resource specified by DCI on the configured Msg4 Cell / BW / CC through the scheduling channel PDCCH of Msg4. After monitoring C-RNTI or TC-RNTI on the PDCCH, the UE receives MSG4 on the corresponding PDSCH and completes the contention resolution.

[0148] Optionally, if there are multiple configured Msg4 Cell / BW / CCs, the Msg4 Cell / BW / CC can be dynamically indicated by DCI, such as by Cell / BW / CC ID.

[0149] The technical scheme provided by the embodiments of the present application can on the one hand flexibly schedule and transmit random access messages among multiple frequency domain units, so that the network device can fully utilize the spectrum resources and improve the spectrum utilization. On the other hand, by transmitting the random access messages on different frequency domain units, the UE can improve the success rate of message transmission and reduce the probability of transmission failure. On the other hand, flexible frequency domain unit configuration can alleviate the load pressure of a single cell and improve the overall capacity and performance of the communication network.

[0150] II. Random access message supports cross-carrier scheduling

[0151] 1. Second information

[0152] Optionally, the second information is not transmitted on the frequency domain unit. Optionally, the frequency domain unit where the second information is located is different from the frequency domain unit, and the second information is used to schedule the random access message. For example, the random access message is a second random access message, and the second information is a downlink signal or channel used to schedule the second random access message. For example, the random access message is a third random access message, and the second information is the second random access message. For example, the Msg2 is different from the carrier where the DCI used to schedule the Msg2 is located. For example, the Msg2 is different from the carrier where the Msg3 is located.

[0153] Optionally, the second information is transmitted on the frequency domain unit. Optionally, the frequency domain unit where the second information is located can also be the same as the frequency domain unit. For example, the Msg2 and the DCI used to schedule the Msg2 are transmitted on the same carrier. For example, the Msg2 and the Msg3 are transmitted on the same carrier.

[0154] Optionally, the second information corresponding to different random access messages is transmitted on the same frequency domain unit. Optionally, the frequency domain units where the different second information is located are the same. Optionally, the different second information refers to the second information used to schedule different types of random access messages. For example, the second information used to schedule the second random access message is the same as the frequency domain unit where the second information used to schedule the fourth random access message is located. For example, the DCI used to schedule the Msg2 is the same as the frequency domain unit where the DCI used to schedule the Msg4 is located.

[0155] Optionally, the number of frequency domain units where the second information is located is less than or equal to the number of frequency domain units. Since the frequency domain units where the different second information is located can be the same, the number of frequency domain units where the second information is located can be small.

[0156] 2. Taking a four-step random access process as an example

[0157] Optionally, the scheduling channel (such as PDCCH) used to schedule the Msg2 / 3 / 4 can be located on the Cell / BW / CC associated with the Msg2 / 3 / 4.

[0158] Optionally, the scheduling channel (e.g. PDCCH) that schedules Msg2 / 3 / 4 and the Cell / BW / CC associated with Msg2 / 3 / 4 can be located in different Cell / BW / CC, i.e. cross-Cell / BW / CC scheduling is supported. The association between the two can be configured semi-statically by the network in the form of broadcast message or dedicated signaling. Further, the scheduling channel that schedules Msg2 / 3 / 4 can be less than the configured Cell / BW / CC associated with Msg2 / 3 / 4. For example, there can be only one scheduling channel used to send the scheduling information of Msg2 / 3 / 4, and the terminal only needs to monitor one scheduling channel, avoiding additional PDCCH monitoring.

[0159] Optionally, multiple Cell / BW / CCs can be distinguished by Cell / BW / CC ID information.

[0160] 1. Cross-Cell / BW / CC scheduling of Msg2: In the random access process, the network device schedules the PDSCH reception of Msg2 on different Cell / BW / CCs through PDCCH.

[0161] The specific steps are as follows:

[0162] a. After sending Msg1, the UE starts the random access response time window (ra-ResponseWindow) and monitors the PDCCH scrambled with RA-RNTI in the time window.

[0163] b. The network device schedules the PDSCH of Msg2 on different Cell / BW / CCs through PDCCH according to the current spectrum resource and load situation. After monitoring the PDCCH with RA-RNTI, the UE receives Msg2 on the specified PDSCH on the corresponding Cell / BW / CC.

[0164] c. The PDSCH of Msg2 contains RAPID, TA command, UL grant, and temporary C-RNTI, etc. information, and the UE performs subsequent transmission according to these information.

[0165] 2. Cross-Cell / BW / CC scheduling of Msg3: In the random access process, the UE sends Msg3 on different Cell / BW / CCs using the UL grant provided in Msg2.

[0166] The specific steps are as follows:

[0167] a. After receiving Msg2, the UE sends the initial transmission of Msg3 on the specified PUSCH resource on the corresponding Cell / BW / CC according to the RAR UL grant.

[0168] b. If the initial transmission of Msg3 fails, the UE can perform the retransmission (HARQ retransmission) of Msg3 on a different Cell / BW / CC scheduled by the network device. Through PDCCH scheduling, the network device can flexibly allocate resources on different Cell / BW / CC to ensure the successful transmission of Msg3.

[0169] c. In addition, during the transmission of Msg3, the UE adjusts the uplink transmission time using the TA information provided in Msg2 to ensure time synchronization with the base station. In addition, the UE constructs Msg3 according to the indication in the UL grant and transmits it on the specified PUSCH resource.

[0170] The technical scheme provided by the embodiments of the present application can flexibly schedule Msg2 and Msg3 on different frequency domain units, so that the network device can optimize resource allocation according to the actual situation and improve the flexibility of transmission. On the other hand, cross-frequency domain unit scheduling can avoid excessive occupation of single cell resources, reduce resource competition, and improve transmission efficiency. On the other hand, by repeatedly transmitting Msg3 on different frequency domain units, the UE can improve the success rate of message transmission and reduce the probability of transmission failure.

[0171] III. Repeated transmission of random access message

[0172] Optionally, the random access message is repeatedly transmitted on different frequency domain units in the plurality of frequency domain units. Illustratively, the first random access message is repeatedly transmitted on carriers 1-3. For example, Msg1 is repeatedly transmitted on carriers 1-3. The network device configures the repeated transmission of the random access message to improve the success rate of transmission.

[0173] 1. Msg1 transmission

[0174] Optionally, the method further includes the following step 630 (not shown in the figure).

[0175] Step 630, the terminal device receives third information, the third information is used to indicate at least two ROs located on different frequency domain units, and the at least two ROs are used for repeated transmission of the first random access message.

[0176] Optionally, the at least two ROs are different from the ROs that do not support repeated transmission of the first random access message. Optionally, the third information is used to indicate the association relationship between the at least two ROs.

[0177] Optionally, for the CBRA, the number of repetitions is determined based on a channel quality threshold, the channel quality threshold being a channel quality threshold of the first reference signal. The number of repetitions is the number of repetitions of the first random access message. The channel quality threshold is used to measure the channel quality of the first reference signal. The channel quality threshold is exemplarily an RSRP threshold. The channel quality threshold is configured by the network device, and the terminal device determines the number of repetitions based on different channel quality thresholds. Exemplarily, the channel quality threshold 1 corresponds to the number of repetitions of 10, and the channel quality threshold 2 corresponds to the number of repetitions of 5.

[0178] Optionally, the one or more channel quality thresholds are semi-statically configured by the network device. Exemplarily, the one or more channel quality thresholds are semi-statically configured by a broadcast message or RRC signaling. Optionally, the terminal device receives the one or more channel quality thresholds, the one or more channel quality thresholds corresponding to the one or more numbers of repetitions. In one example, each channel quality threshold corresponds to a number of repetitions. Optionally, different channel quality thresholds correspond to different numbers of repetitions.

[0179] Optionally, for the CFRA, the number of repetitions is configured by the network device. Exemplarily, the number of repetitions is indicated by RRC signaling.

[0180] The terminal device repeatedly transmits the first random access message on the plurality of frequency domain units, which can improve the transmission success rate of the first random access message. For the CBRA, the number of repetitions of the first random access message can be adjusted based on the channel quality threshold, which can ensure optimal transmission results under different channel conditions.

[0181] 2, Msg3 transmission

[0182] Optionally, the one or more frequency domain units for the repetition of the third random access message are semi-statically configured. Exemplarily, the one or more frequency domain units for the repetition of the third random access message are configured by RRC signaling or a broadcast message.

[0183] Optionally, the one or more frequency domain units for the repetition of the third random access message are dynamically indicated. Exemplarily, the one or more frequency domain units for the repetition of the third random access message are indicated by the RAR or the DCI. Exemplarily, the third random access message is Msg3, and the one or more frequency domain units for the repetition of Msg3 are indicated by Msg2.

[0184] Optionally, in the case that the terminal device has the capability of requesting one or more frequency domain units for the repeated transmission of the third random access message, if the channel measurement result of the first reference signal is lower than the channel quality threshold, the first random access message is also used to request one or more frequency domain units for the repeated transmission of the third random access message.

[0185] Optionally, the first random access message is transmitted on a first PRACH, and the first PRACH is configured to request one or more frequency domain units for the repeated transmission of the third random access message. Optionally, the first PRACH is configured by the network device through a broadcast message or dedicated signaling. Optionally, the first random access message is transmitted on the first PRACH, which implicitly indicates that the first random access message is used to request one or more frequency domain units for the repeated transmission of the third random access message.

[0186] Optionally, the terminal device transmits the third random access message on the corresponding multiple frequency domain units after receiving the second random access message.

[0187] 3. Take the four-step random access procedure as an example

[0188] 1. Msg1 repetition in multiple Cells / BWs / CCs: The network device configures multiple Cells / BWs / CCs for the UE and flexibly configures the repetition transmission resources of Msg1 on these Cells / BWs / CCs. When the UE transmits Msg1, it can select to repeatedly transmit Msg1 on the configured multiple Cells / BWs / CCs to improve the transmission success rate.

[0189] The specific steps include:

[0190] a. The network device configures the repetition transmission resources of Msg1 for the UE through broadcast or dedicated signaling.

[0191] Specifically, a separate RACH resource is indicated for Msg1 repetition, indicating that there is an association relationship between at least two ROs of multiple Cells / BWs / CCs, and the RACH resource is different from the RACH resource (i.e., legacy RACH resource) that does not support MSG1 repetition.

[0192] For CBRA, a separate RSRP threshold is configured for different Msg1 repetition times.

[0193] For CFRA, the network device explicitly indicates the number of Msg1 repetitions.

[0194] b. When the UE transmits Msg1, it repeatedly transmits Msg1 on multiple Cells / BWs / CCs according to the network device configuration. The UE can improve the transmission success rate of Msg1.

[0195] Specifically, for CBRA, the repetition transmission of Msg1 can be adjusted according to the RSRP threshold configured by the network device, ensuring optimal transmission effect under different channel conditions.

[0196] Specifically, for CFRA, according to the indication of the network device.

[0197] 2. Repetition transmission of Msg3 of multiple Cells / BWs / CCs: In the random access process, the UE transmits Msg3 repeatedly on different Cells / BWs / CCs using the resources configured by the network device to improve the reliability and coverage of transmission.

[0198] The specific steps include:

[0199] a. The network device configures specific PRACH resources for the UE to request Msg3 repetition transmission on multiple Cells / BWs / CCs through broadcast or dedicated signaling, which is different from the PRACH resources used by traditional terminals.

[0200] Optionally, the network device semi-statically configures at least two Cells / BWs / CCs for Msg3 repetition transmission.

[0201] Optionally, the network device configures a separate RSRP threshold value for requesting Msg3 repetition transmission on multiple Cells / BWs / CCs.

[0202] b. The UE decides to request the base station for repetition transmission of Msg3 PUSCH on multiple Cells / BWs / CCs according to the RSRP measurement result of the downlink loss reference signal being lower than the threshold value, combined with its own capability (if supported). That is, the terminal implicitly indicates to the base station to request repetition transmission of Msg3 PUSCH on multiple Cells / BWs / CCs by selecting specific PRACH resources when sending Msg1.

[0203] c. After receiving Msg2, the UE transmits the initial transmission repetition of Msg3 on the PUSCH resources specified by the RAR UL grant on the corresponding multiple Cells / BWs / CCs.

[0204] d. If the initial transmission of Msg3 fails, the UE can transmit the repetition transmission of Msg3 retransmission (Msg3 HARQ retransmission) on the PUSCH resources specified by the network device on the PDCCH TC-RNTI scrambled DCI Format 0_0 scheduling on the corresponding multiple Cells / BWs / CCs.

[0205] The technical scheme provided by the embodiments of the present application can improve the success rate of message transmission and reduce the probability of transmission failure by repeatedly transmitting random access messages on multiple frequency domain units. In the application of high frequency bands, the coverage of transmission can be improved by repeatedly transmitting messages on different frequency domain units, and stable connection can be achieved under various channel conditions.

[0206] IV. Initial transmission and retransmission

[0207] 1. Msg3 transmission

[0208] Optionally, the initial transmission and retransmission of the random access message are located on different frequency domain units. For example, the initial transmission of the third random access message is transmitted on carrier 1, and the retransmission is transmitted on carrier 3.

[0209] Optionally, the frequency domain unit for the initial transmission of the third random access message is dynamically indicated by the second random access message. For example, the third random access message is Msg3, and the frequency domain unit for the initial transmission of Msg3 is dynamically indicated by RAR.

[0210] Optionally, the frequency domain unit for the retransmission of the third random access message is dynamically indicated by the third DCI. For example, if the initial transmission of Msg3 fails, the network device configures the retransmission resource of Msg3 for the terminal device through the third DCI.

[0211] Optionally, the frequency domain unit for the retransmission of the fourth random access message is dynamically indicated by the fourth DCI. Optionally, the terminal device determines the first frequency band resource for the initial transmission of the fourth random access message through PDCCH scheduling. If the initial transmission of the fourth random access message fails, the terminal device can perform the retransmission of the fourth random access message on a different frequency domain unit scheduled by the network device.

[0212] 2. Take the four-step random access process as an example

[0213] 1. New transmission and retransmission of Msg3: In the random access process, the network device schedules the new transmission and retransmission of Msg3 on different Cell / BW / CC through PDCCH.

[0214] The specific steps are as follows:

[0215] a. The network device allocates resources for the new transmission of Msg3 through RAR (random access response) in the RACH process. After receiving the RAR, the UE performs the new transmission of Msg3 on the specified Cell / BW / CC according to the UL grant.

[0216] b. If the new transmission of Msg3 fails, the UE can perform the retransmission of Msg3 on different Cell / BW / CC scheduled by the network device. Through PDCCH scheduling, the network device can flexibly allocate resources on different Cell / BW / CC to ensure the successful transmission of Msg3.

[0217] c. In the process of the new transmission and retransmission of Msg3, the UE adjusts the uplink transmission time according to the TA information provided in the RAR, constructs Msg3 according to the indication in the UL grant, and then transmits on the specified PUSCH resource.

[0218] 2. New transmission and retransmission of Msg4: In the contention resolution process, the network device schedules the new transmission and retransmission of Msg4 on different Cell / BW / CC through PDCCH.

[0219] The specific steps are as follows:

[0220] a. The network device schedules the new transmission of Msg4 on the specified Cell / BW / CC through PDCCH in the RACH process. After receiving C-RNTI or TC-RNTI on PDCCH, the UE receives Msg4 on the corresponding PDSCH and completes the contention resolution.

[0221] b. If the new transmission of Msg4 fails, the UE can perform the retransmission of Msg4 on different Cell / BW / CC scheduled by the network device. Through PDCCH scheduling, the network device can flexibly allocate resources on different Cell / BW / CC to ensure the successful transmission of Msg4.

[0222] c. In the process of the new transmission and retransmission of Msg4, the UE receives Msg4 on the specified PDSCH resource according to the indication in the PDCCH, and completes the contention resolution.

[0223] The technical scheme provided by the embodiments of the present application has the following advantages. On the one hand, by flexibly scheduling the new transmission and retransmission of Msg3 and Msg4 on different frequency domain units, the network device can optimize resource allocation according to the actual situation and improve the flexibility of transmission. On the other hand, cross-frequency domain unit scheduling can avoid excessive occupation of single cell resources, reduce resource competition, and has diversity gain.

[0224] In the foregoing method embodiments, the technical solutions of the present application are described from the perspective of the interaction between the terminal device and the network device. The steps performed by the terminal device described above can be implemented alone as a random access method on the terminal device side, and the steps performed by the network device described above can be implemented alone as a random access method on the network device side. In addition, the embodiments provided in the present application can be combined in any manner to form new embodiments, which are all within the scope of protection of the present application.

[0225] The following is a device embodiment of the present application, which can be used to execute the method embodiments of the present application. For details not disclosed in the device embodiments of the present application, please refer to the method embodiments of the present application.

[0226] Please refer to FIG. 7, which shows a block diagram of a random access device according to an embodiment of the present application. The device has the functions of implementing the foregoing random access method examples, which can be implemented by hardware or by hardware executing corresponding software. The device can be the terminal device described above or can be arranged in the terminal device. As shown in FIG. 7, the device 700 can include a receiving module 710.

[0227] The receiving module 710 is configured to receive first information, wherein the first information is used to configure one or more frequency domain units, and the frequency domain units are used for the terminal device to receive and / or transmit a random access message.

[0228] In some embodiments, the frequency domain units are configured for one or more random access messages; and / or,

[0229] The frequency domain units are configured for one or more types of random access messages.

[0230] In some embodiments, the correspondence between a specific random access message and a specific frequency domain unit is indicated by second information.

[0231] In some embodiments, the second information includes identification information of the random access message and / or identification information of the frequency domain unit.

[0232] In some embodiments, the second information is used to schedule the random access message.

[0233] In some embodiments, in the case that the random access message is a random access message received by the terminal device, the second information is downlink control information (DCI).

[0234] In some embodiments, in the case that the random access message is Msg2, the second information is first DCI; or,

[0235] In the case that the random access message is Msg4, the second information is second DCI.

[0236] In some embodiments, in a case where the random access message is a random access message sent by the terminal device, the second information is a random access message received by the terminal device before sending the random access message.

[0237] In some embodiments, in a case where the random access message is Msg3, the second information is Msg2.

[0238] In some embodiments, the second information is not sent on the frequency domain units.

[0239] In some embodiments, the second information corresponding to different random access messages is sent on the same frequency domain unit.

[0240] In some embodiments, the number of frequency domain units where the second information is located is less than or equal to the number of frequency domain units.

[0241] In some embodiments, the random access message is repeatedly transmitted on different frequency domain units in the plurality of frequency domain units.

[0242] In some embodiments, the receiving module 710 is further configured to receive third information, the third information being used to indicate at least two random access occasions ROs located on different frequency domain units, the at least two ROs being used for repeated transmission of a first random access message.

[0243] In some embodiments, for contention-based random access CBRA, the terminal device determines the number of repeated transmissions based on a channel quality threshold, the channel quality threshold being a channel quality threshold of a first reference signal; or,

[0244] For contention-free random access CFRA, the number of repeated transmissions is configured by the network device.

[0245] The number of repeated transmissions is the number of repeated transmissions of the first random access message.

[0246] In some embodiments, the receiving module 710 is further configured to receive one or more channel quality thresholds, the one or more channel quality thresholds corresponding to one or more numbers of repeated transmissions.

[0247] In some embodiments, one or more frequency domain units for repeated transmission of a third random access message are semi-statically configured; and / or,

[0248] The one or more frequency domain units for repeated transmission of the third random access message are dynamically indicated.

[0249] In some embodiments, the one or more frequency domain units for the repeated transmission of the third random access message are configured by radio resource control (RRC) signaling or a broadcast message; and / or,

[0250] The one or more frequency domain units for the repeated transmission of the third random access message are indicated by a random access response (RAR) or a DCI.

[0251] In some embodiments, in a case where the terminal device has a capability of requesting the one or more frequency domain units for the repeated transmission of the third random access message, the first random access message is further used to request the one or more frequency domain units for the repeated transmission of the third random access message if a channel measurement result of the first reference signal is lower than a channel quality threshold.

[0252] In some embodiments, the first random access message is transmitted on a first physical random access channel (PRACH) configured to request the one or more frequency domain units for the repeated transmission of the third random access message.

[0253] In some embodiments, the initial transmission and the retransmission of the random access message are located on different frequency domain units.

[0254] In some embodiments, the frequency domain unit for the initial transmission of the third random access message is dynamically indicated by a second random access message; and / or,

[0255] The frequency domain unit for the retransmission of the third random access message is dynamically indicated by a third DCI.

[0256] In some embodiments, the frequency domain unit for the retransmission of the fourth random access message is dynamically indicated by a fourth DCI.

[0257] In some embodiments, the first information is a broadcast message or dedicated signaling; or,

[0258] The first information is a DCI; or,

[0259] The first information is a second random access message.

[0260] In some embodiments, the apparatus 700 further includes a sending module (not shown in the figure).

[0261] The sending module is configured to send a first random access message on at least one frequency domain unit, the first random access message being used at least to transmit a random access preamble.

[0262] In some embodiments, the at least one frequency domain unit satisfies one or more of the following conditions:

[0263] The channel quality of the at least one frequency domain unit exceeds a first threshold value.

[0264] The at least one frequency domain unit has an association relationship with the terminal device.

[0265] In some embodiments, the random access message includes one or more of the following messages: a first random access message, a second random access message, a third random access message, and a fourth random access message.

[0266] In some embodiments, in a four-step random access process, the first random access message is Msg1, the second random access message is Msg2, the third random access message is Msg3, and the fourth random access message is Msg4.

[0267] In some embodiments, the frequency domain unit is any one of the following: a cell, a carrier, a frequency band, a sub-band, a bandwidth, and a frequency range.

[0268] The technical scheme provided by the embodiments of the present application can flexibly schedule and transmit random access messages among multiple frequency domain units, so that the network device can fully utilize the frequency spectrum resources and improve the utilization rate of the frequency spectrum resources. By transmitting random access messages on different frequency domain units, the success rate of random access message transmission can also be improved, and the probability of transmission failure can be reduced.

[0269] Please refer to FIG. 8, which shows a block diagram of a random access device provided by an embodiment of the present application. The device has the functions of implementing the above-mentioned random access method examples, which can be implemented by hardware or by hardware executing corresponding software. The device can be the network device introduced above or can be arranged in the network device. As shown in FIG. 8, the device 800 can include a sending module 810.

[0270] The sending module 810 is configured to send first information, wherein the first information is used to configure one or more frequency domain units, and the frequency domain units are used for the terminal device to receive and / or send random access messages.

[0271] In some embodiments, the frequency domain unit is configured for one or more random access messages; and / or,

[0272] The frequency domain unit is configured for one or more types of random access messages.

[0273] In some embodiments, the correspondence between a specific random access message and a specific frequency domain unit is indicated by second information.

[0274] In some embodiments, the second information includes identification information of the random access message and / or identification information of the frequency domain unit.

[0275] In some embodiments, the second information is used for scheduling the random access message.

[0276] In some embodiments, in a case that the random access message is a random access message received by the terminal device, the second information is a downlink control information (DCI).

[0277] In some embodiments, in a case that the random access message is Msg2, the second information is a first DCI; or,

[0278] In a case that the random access message is Msg4, the second information is a second DCI.

[0279] In some embodiments, in a case that the random access message is a random access message sent by the terminal device, the second information is a random access message received by the terminal device before sending the random access message.

[0280] In some embodiments, in a case that the random access message is Msg3, the second information is Msg2.

[0281] In some embodiments, the second information is not sent on the frequency domain units.

[0282] In some embodiments, the second information corresponding to different random access messages is sent on the same frequency domain unit.

[0283] In some embodiments, a number of frequency domain units where the second information is located is less than or equal to a number of the frequency domain units.

[0284] In some embodiments, the random access message is repeatedly transmitted on different frequency domain units in the plurality of frequency domain units.

[0285] In some embodiments, the sending module 810 is further configured to send third information, the third information being used for indicating at least two random access occasions (ROs) located on different frequency domain units, the at least two ROs being used for repeated transmission of a first random access message.

[0286] In some embodiments, for a contention-based random access (CBRA), the terminal device determines the number of repeated transmissions based on a channel quality threshold, the channel quality threshold being a channel quality threshold of a first reference signal; or,

[0287] For a contention-free random access (CFRA), the number of repeated transmissions is configured by a network device.

[0288] The number of repeated transmissions is a number of repeated transmissions of a first random access message.

[0289] In some embodiments, the sending module 810 is further configured to send one or more channel quality thresholds, wherein the one or more channel quality thresholds correspond to one or more repetition numbers of the third random access message.

[0290] In some embodiments, the one or more frequency domain units for repetition transmission of the third random access message are semi-statically configured; and / or,

[0291] The one or more frequency domain units for repetition transmission of the third random access message are dynamically indicated.

[0292] In some embodiments, the one or more frequency domain units for repetition transmission of the third random access message are configured by radio resource control (RRC) signaling or broadcast message; and / or,

[0293] The one or more frequency domain units for repetition transmission of the third random access message are indicated by random access response (RAR) or DCI.

[0294] In some embodiments, in a case where the terminal device has a capability of requesting the one or more frequency domain units for repetition transmission of the third random access message, the first random access message is further configured to request the one or more frequency domain units for repetition transmission of the third random access message if a channel measurement result of the first reference signal is lower than a channel quality threshold.

[0295] In some embodiments, the first random access message is transmitted on a first physical random access channel (PRACH) configured to request the one or more frequency domain units for repetition transmission of the third random access message.

[0296] In some embodiments, the initial transmission and the retransmission of the random access message are located on different frequency domain units.

[0297] In some embodiments, the frequency domain unit for initial transmission of the third random access message is dynamically indicated by the second random access message; and / or,

[0298] The frequency domain unit for retransmission of the third random access message is dynamically indicated by the third DCI.

[0299] In some embodiments, the frequency domain unit for retransmission of the fourth random access message is dynamically indicated by the fourth DCI.

[0300] In some embodiments, the first information is a broadcast message or dedicated signaling; or,

[0301] The first information is DCI; or,

[0302] The first information is a second random access message.

[0303] In some embodiments, the apparatus 800 further includes a receiving module (not shown in the figure).

[0304] The receiving module is configured to receive a first random access message on at least one frequency domain unit, the first random access message being used at least for transmitting a random access preamble.

[0305] In some embodiments, the at least one frequency domain unit satisfies one or more of the following conditions:

[0306] The channel quality of the at least one frequency domain unit exceeds a first threshold value;

[0307] The at least one frequency domain unit has an association relationship with the terminal device.

[0308] In some embodiments, the random access message includes one or more of the following messages: a first random access message, a second random access message, a third random access message, and a fourth random access message.

[0309] In some embodiments, in a four-step random access process, the first random access message is Msg1, the second random access message is Msg2, the third random access message is Msg3, and the fourth random access message is Msg4.

[0310] In some embodiments, the frequency domain unit is any one of the following: a cell, a carrier, a frequency band, a sub-band, a bandwidth, and a frequency range.

[0311] The technical solutions provided by the embodiments of the present application can flexibly schedule and transmit random access messages among multiple frequency domain units, so that the network device can fully utilize the frequency spectrum resources and improve the utilization rate of the frequency spectrum resources. By transmitting random access messages on different frequency domain units, the success rate of random access message transmission can be improved, and the probability of transmission failure can be reduced.

[0312] It should be noted that the apparatus provided in the above embodiments, when implementing its functions, is only exemplified by the division of the above various functional modules, and in actual application, the above functions can be completed by different functional modules according to actual needs, that is, the content structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0313] As for the apparatus in the above embodiments, the specific manner in which each module performs operations has been described in detail in the embodiments related to the method, and will not be described in detail here.

[0314] Please refer to FIG. 9, which shows a structural diagram of a communication device according to an embodiment of the present application. The communication device can be the terminal device or the first wireless access device or the network device described above. The communication device 900 can include a processor 901, a transceiver 902, and a memory 903. The transceiver 902 is configured to implement a sending or receiving function, such as the function of the sending module 810 or the function of the receiving module 710 described above. The processor 901 is configured to implement other processing functions or control the sending and / or receiving.

[0315] The processor 901 includes one or more processing cores. The processor 901 performs various functional applications and information processing by running software programs and modules.

[0316] The transceiver 902 can include a receiver and a transmitter, which can be implemented as the same wireless communication component. The wireless communication component can include a wireless communication chip and a radio frequency antenna.

[0317] The memory 903 is connected to the processor 901 and the transceiver 902.

[0318] The memory 903 is configured to store a computer program for execution by the processor 901. The processor 901 is configured to execute the computer program to implement the various steps in the method embodiments described above.

[0319] In some embodiments, when the communication device 900 is a terminal device, the transceiver 902 is configured to receive first information. The first information is used to configure one or more frequency domain units. The frequency domain units are used for the terminal device to receive and / or send a random access message.

[0320] In some embodiments, when the communication device 900 is a network device, the transceiver 902 is configured to send first information. The first information is used to configure one or more frequency domain units. The frequency domain units are used for the terminal device to receive and / or send a random access message.

[0321] For details not described in the present embodiment, refer to the above embodiments, which will not be repeated here.

[0322] In addition, the memory can be implemented by any type of volatile or non-volatile storage devices or a combination thereof, including but not limited to: magnetic or optical disks, electrically erasable programmable read-only memories, erasable programmable read-only memories, static random access memories, read-only memories, magnetic memories, flash memories, programmable read-only memories.

[0323] The embodiment of the present application further provides a computer readable storage medium, wherein the storage medium stores a computer program, and the computer program is used to be executed by a processor to implement the terminal device side random access method or the network device side random access method. Optionally, the computer readable storage medium can include a ROM (Read-Only Memory), a RAM (Random-Access Memory), a SSD (Solid State Drives) or an optical disc, and the like. The random access memory can include a ReRAM (Resistance Random Access Memory) and a DRAM (Dynamic Random Access Memory).

[0324] The embodiment of the present application further provides a chip, wherein the chip includes a programmable logic circuit and / or program instructions, and when the chip is running, the programmable logic circuit and / or program instructions are used to implement the terminal device side random access method or the network device side random access method.

[0325] The embodiment of the present application further provides a computer program product, wherein the computer program product includes a computer program, the computer program is stored in a computer readable storage medium, and a processor reads and executes the computer program from the computer readable storage medium to implement the terminal device side random access method or the network device side random access method.

[0326] It should be understood that the "indication" mentioned in the embodiments of the present application can be direct indication, indirect indication, or can be an indication with an associated relationship. For example, A indicates B, which can mean that B can be obtained by A; or A indirectly indicates B, for example, A indicates C, and B can be obtained by C; or A and B have an associated relationship.

[0327] In the description of the embodiments of the present application, the term "corresponding" can mean that there is a direct or indirect corresponding relationship between the two, or can mean that there is an associated relationship between the two, or can mean an indication and being indicated, configuration and being configured, and the like.

[0328] In some embodiments of the present application, "predefined" can be implemented by pre-storing corresponding codes, tables or other information indicating manners in devices (for example, including terminal devices and APs), and the present application does not limit the specific implementation manners. For example, the pre-defined can mean defined in a protocol.

[0329] In some embodiments of the present application, the "protocol" can refer to a standard protocol in the communication field, which can include the LTE protocol, the NR protocol, and related protocols applied in future communication systems, and the present application is not limited thereto.

[0330] "Multiple" mentioned in the present application refers to two or more. "And / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent three cases: A exists alone, A and B exist together, and B exists alone. The character " / " generally represents that the associated objects before and after it are in an "or" relationship.

[0331] "Greater than or equal to" mentioned in the present application can mean greater than or equal to, and "less than or equal to" can mean less than or equal to.

[0332] In addition, the step numbers described in the present application only exemplarily show a possible execution order between steps, and in some other embodiments, the above steps can also be executed in a sequence different from the number, such as two steps with different numbers are executed at the same time, or two steps with different numbers are executed in an order opposite to the illustration, and the embodiments of the present application are not limited thereto.

[0333] Those skilled in the art should realize that in one or more of the above examples, the functions described in the embodiments of the present application can be realized by hardware, software, firmware or any combination thereof. When realized by software, these functions can be stored in a computer readable medium or transmitted as one or more instructions or codes on a computer readable medium. The computer readable medium includes computer storage medium and communication medium, wherein the communication medium includes any medium facilitating the transmission of computer programs from one place to another. The storage medium can be any available medium accessible by a general or special purpose computer.

[0334] The above only describes exemplary embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

A random access method characterized by comprising: The method is performed by a terminal device, and the method comprises: receiving first information, the first information being used for configuring one or more frequency domain units, the frequency domain units being used for the terminal device to receive and / or transmit a random access message. According to the method of claim 1, wherein The frequency domain units are configured for one or more random access messages; and / or, The frequency domain units are configured for one or more types of random access messages. The method according to claim 2, characterized in that The correspondence between a specific random access message and a specific frequency domain unit is indicated by second information. The method according to claim 2 or 3, characterized in that The second information comprises identification information of the random access message and / or identification information of the frequency domain unit. The method according to claim 3 or 4, characterized in that The second information is used for scheduling the random access message. The method according to any one of claims 3 to 5, characterized in that In the case that the random access message is a random access message received by the terminal device, the second information is downlink control information DCI. According to the method of any one of claims 3 to 6, wherein In the case that the random access message is Msg2, the second information is first DCI; or, In the case that the random access message is Msg4, the second information is second DCI. The method according to any one of claims 3 to 5, characterized in that In the case that the random access message is a random access message transmitted by the terminal device, the second information is a random access message received by the terminal device before transmitting the random access message. The method according to any one of claims 3 to 5, 8, characterized in that In the case that the random access message is Msg3, the second information is Msg2. The method according to any one of claims 3 to 9, characterized in that The second information is not transmitted on the frequency domain unit. The method of claim 10, wherein Second information corresponding to different random access messages is transmitted on the same frequency domain unit. The method according to claim 10 or 11, characterized in that The number of frequency domain units where the second information is located is less than or equal to the number of frequency domain units. The method according to any one of claims 1 to 12, characterized in that The random access message is repeatedly transmitted on different frequency domain units in a plurality of frequency domain units. The method of claim 11, wherein The method further comprises: receiving third information, the third information being used for indicating at least two random access occasions ROs located on different frequency domain units, the at least two ROs being used for repeated transmission of a first random access message. According to the method of claim 13 or 14, wherein For contention-based random access CBRA, the terminal device determines the number of repeated transmissions based on a channel quality threshold, the channel quality threshold being a channel quality threshold of a first reference signal; or, For contention-free random access CFRA, the number of repeated transmissions is configured by a network device; Wherein, the number of repeated transmissions is the number of repeated transmissions of the first random access message. The method of claim 15, wherein The method further comprises: receiving one or more channel quality thresholds, the one or more channel quality thresholds corresponding to one or more numbers of repeated transmissions. According to the method of any one of claims 13 to 16, wherein One or more frequency domain units used for repeated transmission of a third random access message are semi-statically configured; and / or, One or more frequency domain units used for repeated transmission of a third random access message are dynamically indicated. According to the method of claim 17, wherein One or more frequency domain units for the repeated transmission of the third random access message are configured by radio resource control (RRC) signaling or a broadcast message; and / or, One or more frequency domain units for the repeated transmission of the third random access message are indicated by a random access response (RAR) or a DCI. The method according to claim 17 or 18, characterized in that In a case where the terminal device has a capability of requesting one or more frequency domain units for the repeated transmission of the third random access message, if a channel measurement result of the first reference signal is lower than a channel quality threshold, the first random access message is further used to request one or more frequency domain units for the repeated transmission of the third random access message. The method of claim 19, wherein The first random access message is transmitted on a first physical random access channel (PRACH), and the first PRACH is configured to request one or more frequency domain units for the repeated transmission of the third random access message. The initial transmission and the retransmission of the random access message are located on different frequency domain units. The method according to any one of claims 1 to 20, characterized in that The method of claim 21, wherein, The frequency domain unit for the initial transmission of the third random access message is dynamically indicated by a second random access message; and / or, The frequency domain unit for the retransmission of the third random access message is dynamically indicated by a third DCI. The frequency domain unit for the retransmission of the fourth random access message is dynamically indicated by a fourth DCI. The method according to claim 21 or 22, characterized in that The method of any of claims 1-23, wherein, The first information is a broadcast message or dedicated signaling; or, The first information is a DCI; or, The first information is a second random access message. The method further comprises: The method according to any one of claims 1 to 24, characterized in that transmitting a first random access message on at least one frequency domain unit, the first random access message being used at least for transmitting a random access preamble. The at least one frequency domain unit satisfies one or more of the following conditions: The method of claim 25, wherein The channel quality of the at least one frequency domain unit exceeds a first threshold; The at least one frequency domain unit has an association relationship with the terminal device. The random access message comprises one or more of the following messages: a first random access message, a second random access message, a third random access message, and a fourth random access message. The method according to any one of claims 1 to 26, characterized in that In a four-step random access procedure, the first random access message is Msg1, the second random access message is Msg2, the third random access message is Msg3, and the fourth random access message is Msg4. The method of claim 27, wherein The frequency domain unit is any of the following: a cell, a carrier, a frequency band, a sub-band, a bandwidth, and a frequency range. The method according to any one of claims 1 to 28, characterized in that The method is performed by a network device, and the method comprises: A random access method characterized by comprising: transmitting first information, the first information being used to configure one or more frequency domain units, the frequency domain units being used for the terminal device to receive and / or transmit a random access message. The method of claim 30, wherein, The frequency domain units are configured for one or more random access messages; and / or, The frequency domain units are configured for one or more types of random access messages. The correspondence between a specific random access message and a specific frequency domain unit is indicated by second information. The method of claim 31, wherein ​ The method according to claim 31 or 32, characterized in that The second information comprises identification information of the random access message and / or identification information of the frequency domain unit. The method according to claim 32 or 33, characterized in that The second information is used for scheduling the random access message. The method according to any one of claims 32 to 34, characterized in that In a case where the random access message is a random access message received by the terminal device, the second information is downlink control information (DCI). According to any one of claims 32-35, in a case where the random access message is Msg2, the second information is first DCI; or, In a case where the random access message is Msg4, the second information is second DCI. In a case where the random access message is a random access message sent by the terminal device, the second information is a random access message received by the terminal device before sending the random access message. The method according to any one of claims 32 to 34, characterized in that In a case where the random access message is Msg3, the second information is Msg2. The method according to any one of claims 32 to 34, 37, characterized in that The second information is not sent on the frequency domain unit. The method according to any one of claims 32 to 38, characterized in that The second information corresponding to different random access messages is sent on the same frequency domain unit. The method of claim 39, wherein The number of frequency domain units where the second information is located is less than or equal to the number of frequency domain units. The random access message is repeatedly transmitted on different frequency domain units in the plurality of frequency domain units. The method according to claim 39 or 40, characterized in that The method further comprises: The method according to any one of claims 30 to 41, characterized in that sending third information, the third information being used for indicating at least two random access occasions (ROs) located on different frequency domain units, the at least two ROs being used for repeated transmission of a first random access message. The method of claim 40, wherein According to claim 42 or 43, in a case of contention-based random access (CBRA), the terminal device determines the number of repeated transmissions based on a channel quality threshold, the channel quality threshold being a channel quality threshold of a first reference signal; or, In a case of contention-free random access (CFRA), the number of repeated transmissions is configured by a network device. The number of repeated transmissions is the number of repeated transmissions of a first random access message. The method further comprises: sending one or more channel quality thresholds, the one or more channel quality thresholds corresponding to one or more numbers of repeated transmissions. According to any one of claims 42-45, one or more frequency domain units used for repeated transmission of a third random access message are semi-statically configured; and / or, The method of claim 44, wherein one or more frequency domain units used for repeated transmission of the third random access message are dynamically indicated. According to claim 46, one or more frequency domain units used for repeated transmission of the third random access message are configured through radio resource control (RRC) signaling or a broadcast message; and / or, one or more frequency domain units used for repeated transmission of the third random access message are indicated through a random access response (RAR) or DCI. In a case where the terminal device has the capability of requesting one or more frequency domain units used for repeated transmission of the third random access message, if a channel measurement result of the first reference signal is lower than a channel quality threshold, the first random access message is further used for requesting one or more frequency domain units used for repeated transmission of the third random access message. ​ ​ ​ ​ The method according to claim 46 or 47, characterized in that ​ The method of claim 48, wherein The first random access message is transmitted on a first physical random access channel (PRACH), and the first PRACH is configured to request one or more frequency domain units for repeated transmission of the third random access message. The method according to any one of claims 30 to 49, characterized in that The initial transmission and the retransmission of the random access message are located on different frequency domain units. The method of claim 50, wherein The frequency domain unit for the initial transmission of the third random access message is dynamically indicated by the second random access message; and / or The frequency domain unit for the retransmission of the third random access message is dynamically indicated by the third DCI. The method according to claim 50 or 51, characterized in that The frequency domain unit for the retransmission of the fourth random access message is dynamically indicated by the fourth DCI. The method of any of claims 30-52, wherein The first information is a broadcast message or dedicated signaling; or The first information is a DCI; or The first information is a second random access message. The method according to any one of claims 30 to 53, characterized in that The method further comprises: receiving a first random access message on at least one frequency domain unit, the first random access message being used at least for transmitting a random access preamble. The method of claim 54, wherein The at least one frequency domain unit satisfies one or more of the following conditions: The channel quality of the at least one frequency domain unit exceeds a first threshold value; The at least one frequency domain unit has an association relationship with the terminal device. The method according to any one of claims 30 to 55, characterized in that The random access message comprises one or more of the following messages: a first random access message, a second random access message, a third random access message, and a fourth random access message. The method of claim 56, wherein In a four-step random access procedure, the first random access message is Msg1, the second random access message is Msg2, the third random access message is Msg3, and the fourth random access message is Msg4. The method according to any one of claims 30 to 57, characterized in that The frequency domain unit is any of the following: a cell, a carrier, a frequency band, a sub-band, a bandwidth, and a frequency range. A random access device characterized by comprising: The apparatus comprises: a receiving module configured to receive first information, the first information being used to configure one or more frequency domain units, the frequency domain units being used by the terminal device to receive and / or transmit a random access message. A random access device characterized by comprising: The apparatus comprises: a transmitting module configured to transmit first information, the first information being used to configure one or more frequency domain units, the frequency domain units being used by the terminal device to receive and / or transmit a random access message. A communication device characterized by comprising: The communication device comprises a processor and a memory, the memory storing a computer program, and the processor executes the computer program to implement the method of any of claims 1-29 or the method of any of claims 30-58. A computer-readable storage medium, characterized by The storage medium stores a computer program, and the computer program is used to be executed by a processor to implement the method of any of claims 1-29 or the method of any of claims 30-58. A chip characterized by The chip comprises programmable logic circuitry and / or program instructions, and when the chip is running, it is used to implement the method of any of claims 1-29 or the method of any of claims 30-58. A computer program product, characterized in that The computer program product comprises computer instructions stored in a computer-readable storage medium, which are read and executed by a processor to implement the method according to any one of claims 1 to 29, or to implement the method according to any one of claims 30 to 58.

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