WO2020164026A1

WO2020164026A1 - Random access method, terminal device, and network device

Info

Publication number: WO2020164026A1
Application number: PCT/CN2019/074995
Authority: WO
Inventors: 尤心; 卢前溪
Original assignee: Oppo广东移动通信有限公司
Priority date: 2019-02-13
Filing date: 2019-02-13
Publication date: 2020-08-20
Also published as: CN112740806A; CN112740806B

Abstract

Embodiments of the present application disclose a random access method, a terminal device, and a network device. The method comprises: a terminal device determining at least one target cell available for a random access procedure; and the terminal device determining, according to a first radio capability, whether or not to initiate a random access procedure with respect to the at least one target cell, the radio capability being used to indicate a capability of the terminal device to randomly access multiple target cells. The method, terminal device and network device in the embodiments of the application help to improve random access success rates of terminal devices, thereby reducing delays in performing random access procedures, and improving user experience.

Description

Random access method, terminal equipment and network equipment

Technical field

The embodiments of the present application relate to the field of communications, and specifically relate to a random access method, terminal equipment, and network equipment.

Background technique

In related technologies, the terminal device may initiate random access to a target cell under the network configuration. If the random access fails, the terminal device will try to initiate a random access process to the same target cell again or reselect a target cell. This may result in longer delays for random access and poor user experience.

Summary of the invention

The embodiments of the present application provide a random access method, terminal equipment, and network equipment, which are beneficial to increase the probability of successful random access of the terminal equipment, thereby shortening the delay of the random access process and improving user experience.

In a first aspect, a method for random access is provided, the method includes: a terminal device determines at least one target cell that can perform random access; the terminal device determines whether to send to the at least one target cell according to a first wireless capability The target cell initiates random access, and the wireless capability is used to indicate the random access capability of the multi-target cell of the terminal device.

In a second aspect, a random access method is provided, the method includes: a terminal device initiates random access to multiple target cells; and the terminal device successfully accesses a first target among the multiple target cells In the case of a cell, the terminal device sends instruction information to the network device of the second target cell among the multiple target cells, where the instruction information is used to instruct the second target cell to stop performing the operation on the terminal device. Random access.

In a third aspect, a random access method is provided, the method includes: in the case that the terminal device successfully accesses the first target cell, the network device receives indication information, the indication information is used to indicate the second target cell Stop random access to the terminal device, and the network device is the network device of the second target cell.

In a fourth aspect, a terminal device is provided, which is used to execute any one of the first aspect to the second aspect or the method in each implementation manner thereof.

Specifically, the terminal device includes a functional module for executing any one of the above-mentioned first aspect to the second aspect or the method in each implementation manner thereof.

In a fifth aspect, a network device is provided, including a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory, and execute the method in the third aspect or its implementation manners.

In a sixth aspect, a chip is provided, which is used to implement any one of the foregoing first to third aspects or the method in each implementation manner thereof.

Specifically, the chip includes: a processor, configured to call and run a computer program from the memory, so that the device installed with the chip executes any one of the above-mentioned first aspect to the third aspect or each of its implementation modes method.

In a seventh aspect, a computer-readable storage medium is provided for storing a computer program that enables a computer to execute any one of the above-mentioned first aspect to the third aspect or the method in each implementation manner thereof.

In an eighth aspect, a computer program product is provided, including computer program instructions that cause a computer to execute any one of the foregoing first to third aspects or the method in each implementation manner thereof.

In a ninth aspect, a computer program is provided, which when running on a computer, causes the computer to execute any one of the first to third aspects or the methods in each implementation manner thereof.

Through the above technical solution, the terminal device determines whether to initiate random access to at least one target cell according to the wireless capability, so that the terminal device may initiate random access to multiple target cells in parallel, which is beneficial to improve the probability of random access of the terminal device. Thereby, the delay of the random access process is shortened and the user experience is improved.

Description of the drawings

Fig. 1 is a schematic diagram of a communication system architecture provided by an embodiment of the present application.

Figure 2 is a schematic diagram of a contention-based random access process.

Figure 3 is a schematic diagram of a non-contention based random access process.

Figure 4 is a schematic diagram of a handover procedure based on the Xn interface.

Fig. 5 is a schematic block diagram of a random access method provided by an embodiment of the present application.

Fig. 6 is a schematic block diagram of a random access method provided by an embodiment of the present application.

Fig. 7 is a schematic block diagram of a random access method provided by an embodiment of the present application.

FIG. 8 is a schematic block diagram of a terminal device provided by an embodiment of the present application.

FIG. 9 is a schematic block diagram of a terminal device provided by an embodiment of the present application.

FIG. 10 is a schematic block diagram of a network device provided by an embodiment of the present application.

FIG. 11 is another schematic block diagram of a terminal device provided by an embodiment of the present application.

FIG. 12 is another schematic block diagram of a terminal device provided by an embodiment of the present application.

FIG. 13 is another schematic block diagram of a network device provided by an embodiment of the present application.

FIG. 14 is a schematic block diagram of a chip provided by an embodiment of the present application.

FIG. 15 is a schematic block diagram of a communication system provided by an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are a part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

It should be understood that the technical solutions of the embodiments of this application can be applied to various communication systems, such as: Global System of Mobile Communication (GSM) system, Code Division Multiple Access (CDMA) system, and broadband code Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution LTE system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (Time Division Duplex, TDD), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system, New Radio (NR) or future 5G System etc.

In particular, the technical solutions of the embodiments of the present application can be applied to various communication systems based on non-orthogonal multiple access technologies, such as sparse code multiple access (SCMA) systems, low-density signatures (Low Density Signature, LDS) system, etc. Of course, the SCMA system and LDS system can also be called other names in the communication field; further, the technical solutions of the embodiments of this application can be applied to multi-carriers using non-orthogonal multiple access technology Transmission systems, such as non-orthogonal multiple access technology Orthogonal Frequency Division Multiplexing (OFDM), Filter Bank Multi-Carrier (FBMC), Generalized Frequency Division Multiplexing (Generalized Frequency Division Multiplexing) Frequency Division Multiplexing (GFDM), Filtered-OFDM (F-OFDM) systems, etc.

Exemplarily, the communication system 100 applied in the embodiment of the present application is shown in FIG. 1. The communication system 100 may include a network device 110, and the network device 110 may be a device that communicates with a terminal device 120 (or called a communication terminal or terminal). The network device 110 may provide communication coverage for a specific geographic area, and may communicate with terminal devices located in the coverage area. Optionally, the network device 110 may be a base station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, a base station (NodeB, NB) in a WCDMA system, or an evolved base station in an LTE system (Evolutional Node B, eNB or eNodeB), or the wireless controller in the Cloud Radio Access Network (CRAN), or the network equipment can be a mobile switching center, a relay station, an access point, a vehicle-mounted device, Wearable devices, hubs, switches, bridges, routers, network devices gNB in 5G networks, or network devices in the future evolution of public land mobile networks (Public Land Mobile Network, PLMN), etc.

The communication system 100 also includes at least one terminal device 120 located within the coverage area of the network device 110. As used herein, "terminal equipment" includes but is not limited to User Equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile equipment, user terminal, Terminal, wireless communication equipment, user agent or user device. The access terminal can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital processing (Personal Digital Assistant, PDA), with wireless communication Functional handheld devices, computing devices, or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in the future 5G network, or future evolution of the public land mobile network (Public Land Mobile Network, PLMN) Terminal equipment, etc., are not limited in the embodiment of the present invention.

Optionally, direct terminal connection (Device to Device, D2D) communication may be performed between the terminal devices 120.

Optionally, the 5G system or 5G network may also be referred to as a New Radio (NR) system or NR network.

Figure 1 exemplarily shows one network device and two terminal devices. Optionally, the communication system 100 may include multiple network devices and the coverage of each network device may include other numbers of terminal devices. The embodiment does not limit this.

Optionally, the communication system 100 may also include other network entities such as a network controller and a mobility management entity, which are not limited in the embodiment of the present application.

It should be understood that the devices with communication functions in the network/system in the embodiments of the present application may be referred to as communication devices. Taking the communication system 100 shown in FIG. 1 as an example, the communication device may include a network device 110 and a terminal device 120 with communication functions, and the network device 110 and the terminal device 120 may be the specific devices described above, which will not be repeated here. The communication device may also include other devices in the communication system 100, such as other network entities such as a network controller and a mobility management entity, which are not limited in this embodiment of the application.

It should be understood that the terms "system" and "network" in this article are often used interchangeably in this article. The term "and/or" in this article is only an association relationship describing associated objects, which means that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, exist alone B these three situations. In addition, the character "/" in this text generally indicates that the associated objects before and after are in an "or" relationship.

Random access technology is the primary content of the mobile communication system between users and the network. In the wireless cellular network, a user initiates a connection request to the network side through a random access process.

In the NR system, the trigger conditions for random access can include the following:

1. The RRC connection is established. When the terminal device changes from the idle state to the connected state, the terminal device initiates random access.

2. The RRC connection is reestablished. After the radio link fails, the UE will initiate random access when the terminal device needs to re-establish the RRC connection.

3. When the terminal device performs handover, the terminal device initiates random access in the target cell.

4. When the downlink data arrives, when the terminal device is in the connected state, the network device has downlink data that needs to be transmitted to the terminal device, and it is confirmed that the terminal device is out of synchronization in the uplink state (the network device maintains an uplink timer. If the uplink timer expires, the network device does not Upon receiving the sounding reference signal from the terminal device, the network device considers the terminal device to be out of synchronization), and the network device controls the terminal device to initiate random access.

5. When the uplink data arrives, when the terminal device is in the connected state, the terminal device has uplink data that needs to be transmitted to the network device, and indeed finds itself in an uplink out-of-synchronization state (the network device maintains an uplink timer. If the uplink timer expires, the terminal device does not Upon receipt of a network device to adjust the timing advance (TA) command, the terminal device considers that it is out of synchronization in the uplink), and the terminal device initiates random access.

6. When the terminal device is in the connected state and TA is needed for positioning, the terminal device initiates random access.

For ease of understanding, the random access process will be briefly introduced below in conjunction with FIG. 2 and FIG. 3.

Figure 2 shows a contention-based random access procedure. The specific steps include: 1. The terminal device sends MSG1 to the network device, that is, sends a preamble. 2. The network device sends MSG2, that is, a random access response (Random Access Response, RAR) to the terminal device. 3. The terminal device sends MSG3, that is, it starts the first scheduled transmission on the uplink data channel. 4. The network sends MSG4 to the terminal device to feed back the conflict resolution information to the terminal device terminal. Among them, MSG1 is an L1 message, MSG2 and MSG4 are L2, that is, a media access control (Media Access Control, MAC) message, and MSG3 is an RRC message or a MAC message. MSG1 and MSG2 may not use Hybrid Automatic Repeat Request (HARQ), while MSG3 and MSG4 use HARQ transmission. If a random access fails, the UE can initiate the next random access attempt until the maximum number of retransmissions allowed by the network side is reached. Therefore, the time for successful random access can be long or short, depending on the number of random access attempts.

Figure 3 shows a non-contention based random access procedure. The specific steps include: 1. The network device sends MSG0 to the terminal device, that is, random access preamble allocation. 2. The terminal device sends MSG1 to the network device, that is, sends the preamble. 3. The network device sends MSG2, also known as RAR, to the terminal device. Among them, MSG0 and MSG1 are L1 messages, and MSG2 is L2, namely MAC messages. In the non-contention random access process, the resources of the non-contention random access are obtained through RRC signaling or a physical downlink control channel (Physical Downlink Control Channel, PDCCH) order (order).

At present, with people’s pursuit of speed, latency, high-speed mobility, energy efficiency, and the diversity and complexity of business in future life, the 3rd Generation Partnership Project (3GPP) international standards organization has begun research and development. 5G. The main application scenarios of 5G are: Enhanced Mobile Broadband (eMBB), Ultra Reliable & Low Latency Communication (URLLC), and Massive Machine Type of Communication (mMTC).

eMBB still aims for users to obtain multimedia content, services and data, and its demand is growing rapidly. On the other hand, because eMBB may be deployed in different scenarios, such as indoors, urban areas, rural areas, etc., its capabilities and requirements are also quite different, so it cannot be generalized and must be analyzed in detail in conjunction with specific deployment scenarios. Typical applications of URLLC include: industrial automation, power automation, telemedicine operations (surgery), traffic safety protection, etc. Typical features of mMTC include: high connection density, small data volume, delay-insensitive services, low-cost modules and long service life.

Similar to the LTE system, the NR system supports the handover process of the connected UE. When a user who is using network services moves from one cell to another cell, or due to wireless transmission traffic load adjustment, activation operation maintenance, equipment failure, etc., in order to ensure the continuity of communication and the quality of service, the system must transfer the user The communication link with the original cell is transferred to the new cell, that is, the handover process is performed.

Figure 4 shows a schematic diagram of the handover procedure in NR. As shown in Figure 4, the handover process includes some or all of the following steps:

Step 1: Measurement control and reporting. Specifically, the source gNB performs measurement configuration on the UE, and the measurement result of the UE will be used to assist the source gNB to make a handover decision. The UE performs measurement report according to the measurement configuration.

Step 2: The source gNB refers to the measurement report result of the UE and makes a handover decision according to its own handover algorithm.

Step 3: The source gNB sends a handover request message to the target gNB. The message contains information related to handover preparation, including the UE’s X2/Xn and S1/N2 signaling context reference, target cell ID, security key, RRC context, and connection Access Stratum (AS) configuration, Evolved-Universal Terrestrial Radio Access (E-UTRAN) Radio Access Bearer (E-UTRAN Radio Access Bearer, E-RAB) context Wait. At the same time, it also contains the physical layer identification of the source cell and the message authentication verification code, which is used for the recovery process after a possible handover failure. The UE's X2/Xn and S1/N2 signaling context reference can help the target gNB find the location of the source gNB. E-RAB context includes necessary radio network layer (Radio Network Layer, RLN) and Transport Layer (Transport Network Layer, TNL) addressing information, and E-RAB quality of service (Quality of Service, QoS) information, etc.

Step 4: The target gNB performs admission control according to the received E-RAB QoS information to improve the success rate of handover. Admission control should consider reserving corresponding resources, cell radio network temporary identification (Cell Radio Network Temporary Identifier, C-RNTI), and assigning dedicated random access preamble codes. The AS configuration used by the target cell can be a complete configuration completely independent of the source cell, or it can be an incremental configuration based on the source cell (incremental configuration means that the same part is not configured, but only re-configured through signaling. With different parts, the UE will continue to use the original configuration for the configuration that has not been received).

Step 5: The target gNB prepares for L1/L2 handover and at the same time sends a handover request ACK message to the source gNB. The message contains an RRC container, and the specific content is a handover command that triggers the UE to perform handover. The source gNB handover command can be sent to the UE in a transparent manner (without any modification). The handover command includes the new C-RNTI, the case algorithm identifier of the target gNB, and may also carry the special preamble code for random access, access parameters, system information, etc. When the source gNB receives the handover request ACK message or forwards the handover command to the UE, it can start data forwarding.

Step 6: Perform switching instructions. Specifically, the source gNB sends a handover command to the terminal device. The handover command carries an RRC connection reconfiguration message of mobility control information and is generated by the target gNB. The source gNB performs necessary encryption and integrity protection on this message. When the UE receives the message, it will initiate the handover process using the relevant parameters in the message. The UE does not need to wait for the HARQ/Automatic Repeat reQuest (ARQ) response sent by the lower layer to the source gNB, and can initiate the handover process.

Optionally, after the UE receives the handover command, it performs synchronization with the target cell. If the special preamble code for random access is configured in the handover command, the non-contention random access procedure is used to access the target cell. If no special preamble is configured Code, use the competitive random access procedure to access the target cell. The UE calculates the key to be used in the target gNB and configures the security algorithm selected by the network to be used in the target gNB, which is used to communicate with the target gNB after a successful handover.

Step 7: The source gNB sends a sequence number (Sequence Number, SN) status transmission message to the target gNB, and transmits the E-RAB uplink packet data convergence protocol (Packet Data Convergence Protocol, PDCP) SN reception status and downlink PDCP SN transmission status. The uplink PDCP SN reception status includes at least the PDCP SN of the last uplink SDU received in sequence, and may also include the SN of the uplink SDU that caused the loss of the received disorder in the form of bit mapping (if there is such an SDU, These SDUs may require the UE to retransmit in the target cell). The downlink PDCP SN sending status indicates the next SDU sequence number that should be allocated in the target gNB. If no E-RAB needs to transmit the PDCP status report, the source gNB can omit this message.

At this time, the source gNB may transmit the uplink data received from the UE to the target gNB, or may transmit the downlink data received from the user plane function (UPF) entity to the UE. The target gNB buffers the downlink data received from the source gNB.

Step 8: After the UE successfully accesses the target cell, the UE sends an RRC connection reconfiguration complete message to confirm the completion of the handover process to the target gNB. If resources permit, the message may also be accompanied by an upstream buffer status report (Buffer Status Report, BSR) improvement. The target gNB confirms the success of the handover by receiving the RRC connection reconfiguration complete message. At this point, the target gNB can start sending data to the UE.

Step 9: The target gNB sends a path switch request message to the Access and Mobility Management Function (AMF) entity to inform the UE that the cell has been changed. At this time, the air interface handover has been successfully completed.

Step 10: Perform user plane update. Specifically, the AMF sends a user plane update request message to the UPF. UPF can switch the downlink data path to the target gNB side. And UPF sends a user plane update response message to AMF.

Optionally, the AMF can send one or more "end marker packets" to the source gNB on the old path, and then the user plane resources of the source gNB can be released.

Step 11: The AMF sends a path switch request ACK message to the target gNB.

Step 12: The target gNB sends a UE context release message to the source gNB to notify the source gNB that the handover is successful and trigger the source gNB to release resources. The target gNB sends this message after receiving the path switch ACK message sent back from the AMF.

Among them, steps 1 to 5 are the handover preparation phase, steps 6 to 8 are the handover execution phase, and steps 9 to 12 are the handover completion phase.

The random access method provided in the embodiment of the present application is mainly applied to the above handover scenario. In the prior art, the UE may measure multiple target cells, and report the measurement results of multiple target cells to the source gNB. The source gNB may report the measurement results of multiple target cells based on the measurement results of multiple target cells reported by the UE. Each target cell initiates handover preparation/request messages simultaneously or successively (which can be based on the directly connected X2/Xn interface, or through the S1/N2 interface between the Mobility Management Entity (MME)/AMF). Each target cell performs access control according to its own RRM algorithm after receiving the handover preparation/request message, and sends a handover request response message to the base station where the source cell is located on the premise of passing the access control (if the access control fails, then Response to handover request failure message), which carries the handover command generated by the target cell. The source base station selects one of the multiple target cells that return a handover response according to its own Radio Resource Management (RRM) algorithm as the final handover target cell, and sends the handover command corresponding to the target cell through the RRC reconfiguration message Sent to the UE to realize complete control of the handover process by the network.

It can be seen from the above description that the UE only initiates a handover procedure to one target cell under the network configuration, and if the handover fails, the UE triggers the RRC connection re-establishment procedure. The RRC connection re-establishment process involves a new cell selection, and the subsequent re-establishment process signaling will introduce additional delays, causing longer service interruptions and affecting user experience.

With the evolution of carrier aggregation (CA) and dual-connectivity (Dual-Connectivity, DC) technologies, terminal devices that currently support dual uplink (UpLink, UL) are becoming more and more common, which also provides convenience for enhanced mobility condition.

FIG. 5 shows a schematic block diagram of a random access method 200 according to an embodiment of the present application. As shown in FIG. 5, the method 200 may be executed by a terminal device, and the method includes some or all of the following content:

S210: The terminal device determines at least one target cell that can perform random access.

S220: The terminal device determines whether to initiate random access to the at least one target cell according to the first wireless capability, where the wireless capability is used to indicate the random access capability of the multi-target cell of the terminal device.

Specifically, when the terminal device needs to perform random access, it can determine which target cells can perform random access. For example, the terminal device may measure the currently available target cell, and determine whether the measurement result meets the condition, and the terminal device may determine the target cell whose measurement result meets the condition as the target cell capable of random access. For another example, the terminal device may also obtain the location of at least one target cell, and determine whether the distance between the location of the at least one target cell and the current location of the terminal device satisfies the condition, and the terminal device may determine the distance between the target cell and the current location The cell is determined as a target cell capable of random access. After determining the target cell that can perform random access, the terminal device can determine whether to initiate random access to at least one cell that meets the conditions according to the first wireless capability of the terminal device, that is, the multi-target random access capability of the terminal device .

It should be understood that the wireless capability can refer to whether the terminal device supports random access to multiple target cells, or the number of target cells that support parallel random access, that is, the terminal device supports parallel random access to several target cells. Or it may also refer to target cells that support parallel random access, that is, to which target cells the terminal device supports parallel random access.

It should also be understood that the wireless capability may include, but is not limited to, at least one of the following capabilities: carrier aggregation capability, maximum power limitation, and radio frequency capability of the terminal device. For example, different target cells use different carriers and different frequency points. The terminal device determines whether to initiate random access to multiple target cells in parallel according to whether it supports carrier aggregation. For another example, the maximum power limit for initiating random access to a target cell is P0, and the maximum power limit for initiating random access to multiple target cells in parallel is P1. The terminal device determines whether to send to multiple target cells according to the configured maximum power limit. The target cell initiates random access in parallel. The first wireless capability in the embodiment of the present application may be a wireless capability acquired in real time, or may be a wireless capability that is last updated stored in the terminal device.

Optionally, the method 200 of the embodiment of the present application may be applied to a scenario where the terminal device does not currently initiate random access to other target cells, that is, the terminal device does not currently perform random access to other target cells. For example, when a terminal device needs to perform cell handover during the movement process, the terminal device can determine that multiple target cells meet the conditions during the handover process. If the wireless capability of the terminal device supports random access to multiple target cells, the terminal device can Initiate random access to the multiple target cells in parallel. If the wireless capability of the terminal device does not support random access of multiple target cells at this time, the terminal device may select at least one target cell from the multiple target cells to initiate random access.

Optionally, the method 200 of the embodiment of the present application may also be applied to a scenario where the terminal device has currently initiated random access to other target cells. For example, during the handover process, the terminal device determines that a target cell meets the condition, and after initiating random access, another target cell also meets the condition. The terminal device can also determine whether it can initiate the target cell backward based on the wireless capability. Random access. If the wireless capability of the terminal device supports random access of multiple target cells at this time, the terminal device can initiate random access to the target cell that meets the condition backward. If the wireless capability of the terminal device does not support random access of multiple target cells at this time, the terminal device may not initiate random access to the target cell that meets the condition backward.

It should be understood that the wireless capability of the terminal device may be updated in real time. For example, the wireless capability of the terminal device is updated from supporting random access of multiple target cells to not supporting random access of multiple target cells. For another example, the wireless capability of the terminal device is updated from supporting parallel random access of two target cells to supporting parallel random access of three target cells. For another example, the wireless capability of the terminal device is updated from supporting the parallel random access of the first target cell, the second target cell, and the third target cell to supporting the parallel random access of the first target cell and the third target cell.

In other words, the terminal device determines whether to initiate random access to at least one target cell according to the wireless capability. In addition to determining whether the wireless capability supports random access for multiple target cells, it can also determine whether to support random access for the at least one target cell. Access, or the number of the at least one target cell that determines whether to support random access in combination.

In the following, the method 200 is described by taking the terminal device acquiring three target cells (cells): cell1, cell2, and cell3 as an example. The terminal device first measures cell1, cell2, and cell3, for example, performs RRC measurement. If the measurement results of cell1 and cell2 meet the conditions, the terminal device determines whether its wireless capability supports simultaneous initiation of random access to cell1 and cell2. If the wireless capability supports simultaneous access, the terminal device can initiate random access to cell1 and cell2 at the same time. If the wireless capability does not support simultaneous access, the terminal device selects one of cell1 and cell2 to initiate random access.

It should be noted that the simultaneous initiation of random access in the embodiments of the present application refers to the overlap of the entire random access process, and does not only refer to the overlap of the start time of the random access process.

If the subsequent terminal device measures cell3 again, and the measurement result of cell3 meets the trigger condition, the terminal device can continue to determine whether the wireless capability supports simultaneous initiation of random access to cell3. If the wireless capability supports simultaneous access, the terminal device can continue to initiate random access to cell3, and if the wireless capability does not support simultaneous access, the terminal device does not initiate random access to cell3.

It can be known from the foregoing that the terminal device determining at least one target cell capable of random access may include determining a target cell that meets the condition as the at least one target cell.

For high-speed mobile scenarios and high-frequency deployment scenarios, there are frequent handovers and handovers that are prone to failure. 3GPP is currently discussing the introduction of a condition-based handover process for LTE and NR systems. The basic principle is that the terminal device performs handover to the target cell according to the pre-configured handover command (that is, triggers the random access process and sends the handover complete message) when evaluating the triggering of the conditions related to the target cell according to the conditions configured on the network side. Avoid the problem of too late or inability to send measurement reports and receive handover commands due to high-speed movement into poor coverage areas.

In other words, the terminal device may receive a pre-handover command of one or more target cells (hereinafter may be referred to as candidate target cells). The pre-handover command may include a preamble, a resource for sending the preamble, etc., and may also include a trigger condition. It should be understood that the trigger condition may be a threshold for comparing the target cell, or a threshold for comparing the source cell, or may also be a threshold for jointly comparing the source cell and the target cell. For candidate target cells, the trigger condition may be the same, or different candidate target cells may be configured with different trigger conditions.

Optionally, the trigger condition may be a threshold value compared with the measurement result. Then the terminal device can measure the candidate target cell first, and compare the measurement result with the threshold value.

Optionally, the trigger condition may also be a threshold value compared with the distance between the candidate target cell and the location of the terminal device, then the terminal device may first obtain the location of the candidate target cell and its own location, and compare the two The distance is compared with the threshold.

Optionally, the trigger condition may also be another threshold value, that is, the terminal device may also determine the at least one target cell in another manner.

Optionally, in the embodiment of the present application, the method further includes: if the random access initiated by the terminal device to multiple target cells has not been successful, the terminal device changes the wireless capability of the terminal device from the The first wireless capability is updated to the second wireless capability, and the second wireless capability is different from the first wireless capability; and the terminal device reports to some of the multiple target cells according to the second wireless capability. Perform random access.

The random access initiated by the terminal device to multiple target cells has not been successful. It may be that the random access initiated to multiple target cells has not failed, but it has not successfully accessed any of the target cells. For example, the terminal device can start a timer while initiating random access to the earliest target cell, and fail to access any target cell before the timer expires, including random access failure or unfinished random access procedures. Then the terminal device can consider that the random access initiated to multiple target cells has not been successful.

The update of the wireless capability of the terminal device here may refer to the reduction of the wireless capability. For example, the internal physical layer of the terminal device may indicate a new restriction condition of the MAC layer or the RRC layer, so that the terminal device cannot perform random access in the multiple target cells at the same time. The update of the wireless capability may be generated by the internal implementation of the terminal device. For example, the terminal device may newly add a vehicle to everything (V2X) service in the sidelink (SL) frequency band, which reduces the ability to initiate random access to multiple target cells at the same time.

The terminal device may perform random access to some of the multiple target cells according to the updated wireless capabilities. In other words, the terminal device stops random access to some of the multiple target cells. For example, the terminal device may stop random access to some target cells of the multiple target cells according to the previous sequence of initiating random access to multiple target cells. Take the terminal device that has initiated random access to cell1, cell2, and cell3 and the random access has not been successful as an example. At this time, the physical layer can instruct the MAC layer or RRC layer to generate new restrictions, that is, reduce the wireless capability, so that the terminal device cannot be simultaneously For random access on cell1, cell2, and cell3, the terminal device stops the latest random access process (such as cell3). If the terminal device has not successfully accessed the target cell to continue random access, the terminal device can continue Stop the random access process that starts the next night, and so on. If the random access process is started at the same time (such as cell1 and cell2), the terminal device can select one of the cells to stop random access until the terminal device can successfully access the target cell that continues random access.

Optionally, in the embodiment of the present application, the method further includes: when the terminal device initiates random access to multiple target cells and successfully accesses the first target cell of the multiple target cells The terminal device sends instruction information to a network device of a second target cell among the multiple target cells, where the instruction information is used to instruct the second target cell to stop random access to the terminal device.

If the terminal device initiates random access to multiple target cells in parallel, and successfully accesses one of the target cells and the random access of other target cells continues, the terminal device can indicate to the network equipment of the other target cells to stop the terminal device Perform random access. Thereby, network devices in other target cells can stop unnecessary random access procedures in time, avoid continuing to allocate wireless resources to terminal devices, and thereby reduce resource waste on the network side as much as possible.

It should be understood that the terminal device may not need to determine whether to initiate random access to multiple target cells based on its own wireless capabilities. It may default to that the terminal device supports random access to multiple target cells, that is, the terminal device may directly initiate random access to multiple target cells. Random access.

Optionally, in this embodiment of the present application, the terminal device sending instruction information to the network device of the second target cell among the multiple target cells includes: the terminal device sends the instruction information to the network device of the first target cell The radio resource control RRC reconfiguration complete message sent by the network device sends the indication information to the network device of the second target cell.

For example, the pre-handover command configured for the terminal device includes candidate target cells cell1, cell2, and cell3. Then, according to the RRC measurement result of the terminal device, cell1 and cell2 meet the trigger condition at the same time or one after another. At this time, the terminal device initiates random access to cell1 and cell2 (same frequency or different frequency) simultaneously or successively. If the random access of cell1 is successful but the random access of cell2 is still in progress, the terminal device can report the identification information of other target cells that are performing random access in the RRC reconfiguration complete message sent to the network device of cell1 ( For example, cell2), including but not limited to physical cell identity (PCI) and frequency information, or cell global identifier (Cell Global Identifier) CGI information, etc. The terminal equipment can stop the random access process to cell2 at the same time. After receiving the identification information of cell2, the network equipment of Cell1 stops the random access process and resource allocation to the UE through the network equipment of cell2.

It should be understood that the respective network devices of at least one target cell in the embodiment of the present application may be the same or different. For example, the network devices of cell1 and cell2 are the same, and the network device of cell1 receives the RRC reconfiguration complete message sent by the terminal device, and can directly stop the random access process of cell2 to the terminal device according to the identification information of cell2 carried in it. The network devices of the source cell and the target cell mentioned above may also be the same or different.

Optionally, in this embodiment of the present application, the terminal device sending instruction information to the network device of the second target cell among the multiple target cells includes: the terminal device passes through the network device of the second target cell The resource indicated in the uplink grant allocated by the device for the terminal device sends the indication information to the network device of the second target cell.

For example, the pre-handover command configured for the terminal device includes candidate target cells cell1, cell2, and cell3. Then, according to the RRC measurement result of the terminal device, cell1 and cell2 meet the trigger condition at the same time or successively. At this time, the terminal device initiates random access to cell1 and cell2 (same frequency or different frequency) simultaneously or successively. If the random access of cell1 is successful but the random access of cell2 is still in progress, the terminal device sends an RRC reconfiguration complete message to cell1, and the terminal device also continues the random access process of cell2, and it sends instructions to the network device of cell2 This can be done in the following ways:

Method 1: If the terminal device has sent a preamble in cell2 at this time and is waiting for the RAR message, the terminal device continues to wait for the RAR message. If the RAR message is received in the RAR window (window), the UE sends instruction information for the uplink authorization indication resource allocated in the RAR message for the terminal device sent by the network device of cell2 to notify the network device of cell2 that the terminal device has succeeded Access to other target cells, request the network equipment of cell2 to release configuration and resources. The indication information can be notified by a new MAC control element (CE); if the RAR message is not received in the RAR window, the terminal device will not try a new preamble transmission, that is, it will not initiate random access to cell2. Terminate the random access procedure.

Manner 2: If the terminal device is currently performing contention-based random access in cell2 and the scheduled transmission has been sent and is waiting for the contention resolution message, the terminal device continues to wait for the contention resolution message. If the contention resolution message is received before the contention resolution timer expires, the terminal device sends indication information through the resources allocated by the uplink authorization indication in the contention resolution message to notify the network device of cell2 that the terminal device has successfully accessed other target cells, requesting The network releases configuration and resources. The indication information can be notified by the new MAC CE; if the contention resolution message is not received before the contention resolution timer expires, the terminal device will not try a new preamble transmission, that is, it will not initiate random access to cell2 and terminate the random access Into the process.

FIG. 6 shows a schematic block diagram of a random access method 300 according to an embodiment of the present application. As shown in FIG. 6, the method 300 may be executed by a terminal device, and the method includes some or all of the following content:

S310: The terminal device initiates random access to multiple target cells;

S320: In the case that the terminal device successfully accesses the first target cell of the multiple target cells, the terminal device sends instruction information to the network device of the second target cell of the multiple target cells, The indication information is used to instruct the second target cell to stop random access to the terminal device.

Optionally, in this embodiment of the present application, the indication information includes identification information of the second target cell.

Optionally, in this embodiment of the present application, the terminal device transmits to the network device of the second target cell through the resource indicated in the uplink authorization that the network device of the second target cell has allocated for the terminal device The indication information includes: if the terminal device receives the RAR message sent by the network device of the second target cell to the terminal device within the random access response RAR window, the terminal device passes the RAR message Sending the indication information to the network equipment of the second target cell by the resource indicated in the uplink grant in.

Optionally, in the embodiment of the present application, the method further includes: if the terminal device does not receive the RAR sent by the network device of the second target cell to the terminal device within the random access response RAR window Message, the terminal device stops re-initiating random access to the second target cell.

Optionally, in this embodiment of the present application, the terminal device transmits to the network device of the second target cell through the resource indicated in the uplink authorization that the network device of the second target cell has allocated for the terminal device The indication information includes: if the terminal device receives the contention resolution message sent by the second target cell to the terminal device before the contention resolution timer expires, the terminal device passes the content in the contention resolution message The resource indicated in the uplink grant sends the indication information to the network device of the second target cell.

Optionally, in the embodiment of the present application, the method further includes: if the terminal device does not receive the contention resolution sent by the network device of the second target cell to the terminal device before the contention resolution timer expires Message, the terminal device stops re-initiating random access to the second target cell.

FIG. 7 shows a schematic block diagram of a random access method 400 according to an embodiment of the present application. As shown in FIG. 7, the method 400 may be executed by a terminal device, and the method includes some or all of the following content:

S410: In a case where the terminal device successfully accesses the first target cell, the network device receives indication information, where the indication information is used to instruct the second target cell to stop random access to the terminal device, and the network device is The network equipment of the second target cell.

Optionally, in this embodiment of the present application, the indication information is carried in a radio resource control RRC reconfiguration complete message sent by the terminal device to the network device of the first target cell, and the network device receives the indication information , Including: the network device receives the indication information sent by the network device of the first target cell.

Optionally, in the embodiment of the present application, the receiving of the indication information by the network device includes: the network device receiving the indication information through the resource indicated in the uplink grant allocated for the terminal device.

Optionally, in the embodiment of the present application, the network device receiving the indication information through the resource indicated in the uplink grant allocated for the terminal device includes: the network device through the Random access responds to the resource indicated in the uplink grant in the RAR message to receive the indication information.

Optionally, in the embodiment of the present application, the network device receiving the instruction information through the uplink authorization that has been allocated to the terminal device includes: the network device receiving the instruction information through the contention resolution message sent to the terminal device The resource indicated in the uplink grant receives the indication information.

It should be understood that the interaction between the network device and the terminal device described by the network device and related characteristics and functions correspond to the related characteristics and functions of the terminal device. That is to say, what message the network device sends to the terminal device, and the terminal device receives the corresponding message from the network device.

It should also be understood that in the various embodiments of the present application, the size of the sequence number of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not be implemented in this application. The implementation process of the example constitutes any limitation.

The random access method according to the embodiment of the present application is described in detail above, and the random access device according to the embodiment of the present application will be described below in conjunction with FIG. 8 to FIG. 13. The technical features described in the method embodiment are applicable to the following Device embodiment.

FIG. 8 shows a schematic block diagram of a terminal device 500 according to an embodiment of the present application. As shown in FIG. 8, the terminal device 500 includes:

The processing unit 510 is configured to determine at least one target cell that can perform random access, and determine whether to initiate random access to the at least one target cell according to the first wireless capability, where the wireless capability is used to instruct the terminal device Random access capability of multi-target cells.

Optionally, in this embodiment of the present application, the at least one target cell includes multiple target cells, and in a case where the terminal device does not initiate random access to other target cells, the processing unit is specifically configured to: If the first wireless capability does not support random access of multiple target cells, it is determined to initiate random access to at least one of the multiple target cells; if the first wireless capability supports random access of multiple target cells , Determining to initiate random access to the multiple target cells.

Optionally, in the embodiment of the present application, in the case that the terminal device has initiated random access to other target cells, the processing unit is specifically configured to: if the first wireless capability does not support multi-target cell Random access, determining not to initiate random access to the at least one target cell; if the first wireless capability supports random access of multiple target cells, determining to initiate random access to the at least one target cell.

Optionally, in the embodiment of the present application, the processing unit is further configured to: if the random access initiated by the terminal device to multiple target cells has not been successful, change the wireless capability of the terminal device from the first The wireless capability is updated to a second wireless capability, and the second wireless capability is different from the first wireless capability; the terminal device further includes: a transceiver unit, configured to report to the multiple targets according to the second wireless capability Some target cells in the cell perform random access.

Optionally, in the embodiment of the present application, the processing unit is further configured to: according to the sequence of initiating random access to the multiple target cells last time, stop removing the part of the target cells from the multiple target cells. Random access by a target cell outside the cell.

Optionally, in the embodiment of the present application, the terminal device further includes: a transceiver unit, configured to initiate random access to multiple target cells by the terminal device and successfully access the first one of the multiple target cells In the case of a target cell, sending instruction information to a network device of a second target cell among the multiple target cells, where the instruction information is used to instruct the second target cell to stop random access to the terminal device. Into.

Optionally, in the embodiment of the present application, the transceiver unit is specifically configured to: send a radio resource control RRC reconfiguration complete message to the network device of the second target cell through a radio resource control RRC reconfiguration complete message sent to the network device of the first target cell The instruction information.

Optionally, in this embodiment of the application, the transceiving unit is specifically configured to: send the resources indicated in the uplink grant allocated to the terminal equipment by the network equipment of the second target cell to the second target cell Sending the instruction information to the network device of.

Optionally, in the embodiment of the present application, the transceiving unit is specifically configured to: if the terminal device receives the data sent by the network device of the second target cell to the terminal device within the random access response RAR window The RAR message is used to send the indication information to the network device of the second target cell through the resource indicated by the uplink authorization in the RAR message.

Optionally, in the embodiment of the present application, the processing unit is further configured to: if the terminal device does not receive the network device of the second target cell within the random access response RAR window and send it to the terminal device RAR message to stop re-initiating random access to the second target cell.

Optionally, in the embodiment of the present application, the transceiver unit is specifically configured to: if the terminal device receives the contention sent by the network device of the second target cell to the terminal device before the contention resolution timer expires The resolution message is used to send the indication information to the network device of the second target cell through the resource indicated by the uplink authorization in the contention resolution message.

Optionally, in the embodiment of the present application, the processing unit is further configured to: if the terminal device does not receive the data sent by the network device of the second target cell to the terminal device before the contention resolution timer expires The contention resolution message stops re-initiating random access to the second target cell.

Optionally, in the embodiment of the present application, the at least one target cell includes a third target cell, and the processing unit is specifically configured to: when the third target cell satisfies the first condition, determine the first The third target cell is a target cell that can perform random access.

Optionally, in this embodiment of the present application, the terminal device further includes: a transceiver unit, configured to receive a pre-handover command, where the pre-handover command includes a candidate target cell configured for the terminal device and the first condition , The candidate target cell includes the third target cell.

It should be understood that the terminal device 500 according to the embodiment of the present application may correspond to the terminal device in the method embodiment of the present application, and the above-mentioned and other operations and/or functions of each unit in the terminal device 500 are to implement the terminal device in the method of FIG. For the sake of brevity, the corresponding process of the equipment will not be repeated here.

FIG. 9 shows a schematic block diagram of a terminal device 600 according to an embodiment of the present application. As shown in FIG. 9, the terminal device 600 includes:

The transceiver unit 610 is configured to initiate random access to multiple target cells, and in the case that the terminal device successfully accesses the first target cell of the multiple target cells, The network device of the second target cell sends instruction information, where the instruction information is used to instruct the second target cell to stop random access to the terminal device.

Optionally, in the embodiment of the present application, the transceiver unit is specifically configured to: send a radio resource control RRC reconfiguration complete message to the network device of the second target cell via a radio resource control RRC reconfiguration complete message sent to the network device of the second target cell. Send the instruction information.

Optionally, in the embodiment of the present application, the transceiving unit is specifically configured to: if the terminal device receives the data sent by the network device of the second target cell to the terminal device within the random access response RAR window The RAR message is used to send the indication information to the network device of the second target cell through the resource indicated in the uplink grant in the RAR message.

Optionally, in the embodiment of the present application, the terminal device further includes a processing unit, configured to send to the network device of the second target cell if the terminal device does not receive within the random access response RAR window The RAR message of the terminal device stops re-initiating random access to the second target cell.

Optionally, in the embodiment of the present application, the transceiver unit is specifically configured to: if the terminal device receives the contention resolution message sent by the second target cell to the terminal device before the contention resolution timer expires And send the indication information to the network device of the second target cell through the resource indicated in the uplink grant in the contention resolution message.

Optionally, in the embodiment of the present application, the terminal device further includes: a processing unit, configured to, if the terminal device does not receive the network device of the second target cell before the contention resolution timer expires, send it to the The contention resolution message of the terminal device stops re-initiating random access to the second target cell.

It should be understood that the terminal device 600 according to the embodiment of the present application may correspond to the terminal device in the method embodiment of the present application, and the above-mentioned and other operations and/or functions of each unit in the terminal device 600 are to implement the terminal device in the method of FIG. For the sake of brevity, the corresponding process of the equipment will not be repeated here.

FIG. 10 shows a schematic block diagram of a network device 700 according to an embodiment of the present application. As shown in FIG. 10, the network device 700 includes:

The transceiver unit 710 is configured to receive indication information when the terminal device successfully accesses the first target cell, the indication information is used to instruct the second target cell to stop random access to the terminal device, the network The device is a network device of the second target cell.

Optionally, in the embodiment of the present application, the indication information is carried in a radio resource control RRC reconfiguration complete message sent by the terminal device to the network device of the first target cell, and the transceiver unit is specifically configured to : Receiving the indication information sent by the network device of the first target cell.

Optionally, in the embodiment of the present application, the transceiving unit is specifically configured to: receive the indication information through the resource indicated in the uplink grant allocated for the terminal device.

Optionally, in this embodiment of the present application, the transceiving unit is specifically configured to receive the indication information through the resource indicated in the uplink grant in the random access response RAR message sent to the terminal device.

Optionally, in the embodiment of the present application, the transceiving unit is specifically configured to receive the indication information through the resource indicated in the uplink grant in the contention resolution message sent to the terminal device.

It should be understood that the network device 700 according to the embodiment of the present application may correspond to the network device in the method embodiment of the present application, and the above-mentioned and other operations and/or functions of each unit in the network device 700 are to implement the network in the method of FIG. For the sake of brevity, the corresponding process of the equipment will not be repeated here.

As shown in FIG. 11, an embodiment of the present application also provides a terminal device 800. The terminal device 800 may be the terminal device 500 in FIG. 8, which can be used to execute the content of the terminal device corresponding to the method 200 in FIG. . The terminal device 800 shown in FIG. 11 includes a processor 810, and the processor 810 can call and run a computer program from the memory to implement the method in the embodiment of the present application.

Optionally, as shown in FIG. 11, the terminal device 800 may further include a memory 820. Wherein, the processor 810 can call and run a computer program from the memory 820 to implement the method in the embodiment of the present application.

The memory 820 may be a separate device independent of the processor 810, or may be integrated in the processor 810.

Optionally, as shown in FIG. 11, the terminal device 800 may further include a transceiver 830, and the processor 810 may control the transceiver 830 to communicate with other devices. Specifically, it may send information or data to other devices, or receive other devices. Information or data sent by the device.

Among them, the transceiver 830 may include a transmitter and a receiver. The transceiver 830 may further include an antenna, and the number of antennas may be one or more.

Optionally, the terminal device 800 may be a terminal device of an embodiment of the present application, and the terminal device 800 may implement the corresponding process implemented by the terminal device in each method of the embodiment of the present application. For brevity, details are not described herein again.

In a specific implementation manner, the processing unit in the terminal device 500 may be implemented by the processor 810 in FIG. 11. The transceiver unit in the terminal device 500 may be implemented by the transceiver 830 in FIG. 11.

As shown in FIG. 12, an embodiment of the present application also provides a terminal device 900. The terminal device 900 may be the terminal device 600 in FIG. 9, which can be used to execute the content of the terminal device corresponding to the method 300 in FIG. . The terminal device 900 shown in FIG. 12 includes a processor 910, and the processor 910 can call and run a computer program from the memory to implement the method in the embodiment of the present application.

Optionally, as shown in FIG. 12, the terminal device 900 may further include a memory 920. The processor 910 may call and run a computer program from the memory 920 to implement the method in the embodiment of the present application.

The memory 920 may be a separate device independent of the processor 910, or may be integrated in the processor 910.

Optionally, as shown in FIG. 12, the terminal device 900 may further include a transceiver 930, and the processor 910 may control the transceiver 930 to communicate with other devices. Specifically, it may send information or data to other devices, or receive other devices. Information or data sent by the device.

The transceiver 930 may include a transmitter and a receiver. The transceiver 930 may further include an antenna, and the number of antennas may be one or more.

Optionally, the terminal device 900 may be a terminal device of an embodiment of the present application, and the terminal device 900 may implement the corresponding process implemented by the terminal device in each method of the embodiment of the present application. For brevity, details are not described herein again.

In a specific implementation manner, the processing unit in the terminal device 600 may be implemented by the processor 910 in FIG. 12. The transceiver unit in the terminal device 600 may be implemented by the transceiver 930 in FIG. 12.

As shown in FIG. 13, an embodiment of the present application also provides a network device 1000. The network device 1000 may be the network device 700 in FIG. 10, which can be used to execute the content of the network device corresponding to the method 400 in FIG. . The network device 1000 shown in FIG. 13 includes a processor 1010, and the processor 1010 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in FIG. 13, the network device 1000 may further include a memory 1020. The processor 1010 can call and run a computer program from the memory 1020 to implement the method in the embodiment of the present application.

The memory 1020 may be a separate device independent of the processor 1010, or it may be integrated in the processor 1010.

Optionally, as shown in FIG. 13, the network device 1000 may further include a transceiver 1030, and the processor 1010 may control the transceiver 1030 to communicate with other devices. Specifically, it may send information or data to other devices, or receive other devices. Information or data sent by the device.

Among them, the transceiver 1030 may include a transmitter and a receiver. The transceiver 1030 may further include an antenna, and the number of antennas may be one or more.

Optionally, the network device 1000 may be a network device of an embodiment of the present application, and the network device 1000 may implement corresponding processes implemented by the network device in each method of the embodiments of the present application. For brevity, details are not described herein again.

In a specific implementation manner, the processing unit in the network device 400 may be implemented by the processor 1010 in FIG. 13. The transceiver unit in the network device 400 may be implemented by the transceiver 1030 in FIG. 13.

FIG. 14 is a schematic structural diagram of a chip of an embodiment of the present application. The chip 2000 shown in FIG. 14 includes a processor 2010, and the processor 2010 can call and run a computer program from the memory to implement the method in the embodiment of the present application.

Optionally, as shown in FIG. 14, the chip 2000 may further include a memory 2020. The processor 2010 can call and run a computer program from the memory 2020 to implement the method in the embodiment of the present application.

The memory 2020 may be a separate device independent of the processor 2010, or may be integrated in the processor 2010.

Optionally, the chip 2000 may further include an input interface 2030. The processor 2010 can control the input interface 2030 to communicate with other devices or chips, and specifically, can obtain information or data sent by other devices or chips.

Optionally, the chip 2000 may further include an output interface 2040. The processor 2010 can control the output interface 2040 to communicate with other devices or chips, specifically, can output information or data to other devices or chips.

Optionally, the chip can be applied to the terminal device in the embodiment of the present application, and the chip can implement the corresponding process implemented by the terminal device in the various methods of the embodiment of the present application. For brevity, details are not repeated here.

Optionally, the chip can be applied to the network device in the embodiment of the present application, and the chip can implement the corresponding process implemented by the network device in the various methods of the embodiment of the present application. For brevity, details are not described herein again.

It should be understood that the chip mentioned in the embodiment of the present application may also be referred to as a system-level chip, a system-on-chip, a system-on-chip, or a system-on-chip, etc.

FIG. 15 is a schematic block diagram of a communication system 3000 provided by an embodiment of the present application. As shown in FIG. 15, the communication system 3000 includes a network device 3010 and a terminal device 3020.

Wherein, the network device 3010 can be used to implement the corresponding function implemented by the network device in the above method, and the terminal device 3020 can be used to implement the corresponding function implemented by the terminal device in the above method. For brevity, it will not be repeated here. .

It should be understood that the processor of the embodiment of the present application may be an integrated circuit chip with signal processing capability. In the implementation process, the steps of the foregoing method embodiments can be completed by hardware integrated logic circuits in the processor or instructions in the form of software. The above-mentioned processor may be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (ASIC), a ready-made programmable gate array (Field Programmable Gate Array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

It can be understood that the memory in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), and electrically available Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. The volatile memory may be a random access memory (Random Access Memory, RAM), which is used as an external cache. By way of exemplary but not restrictive description, many forms of RAM are available, such as static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (Double Data Rate SDRAM, DDR SDRAM), Enhanced Synchronous Dynamic Random Access Memory (Enhanced SDRAM, ESDRAM), Synchronous Link Dynamic Random Access Memory (Synchlink DRAM, SLDRAM) ) And Direct Rambus RAM (DR RAM). It should be noted that the memories of the systems and methods described herein are intended to include, but are not limited to, these and any other suitable types of memories.

It should be understood that the foregoing memory is exemplary but not restrictive. For example, the memory in the embodiment of the present application may also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), Synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection Dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM), etc. That is to say, the memory in the embodiment of the present application is intended to include but not limited to these and any other suitable types of memory.

The embodiment of the present application also provides a computer-readable storage medium for storing computer programs.

Optionally, the computer-readable storage medium may be applied to the network device in the embodiment of the present application, and the computer program causes the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. For brevity, here No longer.

Optionally, the computer-readable storage medium can be applied to the terminal device in the embodiment of the present application, and the computer program causes the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of the present application, for the sake of brevity , I won’t repeat it here.

The embodiments of the present application also provide a computer program product, including computer program instructions.

Optionally, the computer program product may be applied to the network device in the embodiment of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. For the sake of brevity, it is not here. Repeat it again.

Optionally, the computer program product can be applied to the terminal device in the embodiment of this application, and the computer program instructions cause the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of this application. For the sake of brevity, I will not repeat them here.

The embodiment of the present application also provides a computer program.

Optionally, the computer program can be applied to the network device in the embodiment of the present application. When the computer program runs on the computer, the computer is caused to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. For the sake of brevity , I won’t repeat it here.

Optionally, the computer program can be applied to the terminal device in the embodiment of the present application. When the computer program runs on the computer, it causes the computer to execute the corresponding process implemented by the terminal device in each method of the embodiment of the present application. For the sake of brevity , I won’t repeat it here.

A person of ordinary skill in the art may be aware that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the above-described system, device, and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, the functional units in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of this application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory,) ROM, random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

A random access method, characterized in that it comprises:

The terminal device determines at least one target cell that can perform random access;

The terminal device determines whether to initiate random access to the at least one target cell according to the first wireless capability, where the wireless capability is used to indicate the random access capability of the multi-target cell of the terminal device.
The method according to claim 1, wherein the at least one target cell includes multiple target cells, and when the terminal device does not initiate random access to other target cells, the terminal device The first wireless capability, determining whether to initiate random access to at least one target cell, includes:

If the first wireless capability does not support random access of multiple target cells, the terminal device determines to initiate random access to at least one target cell of the multiple target cells;

If the first wireless capability supports random access of multiple target cells, the terminal device determines to initiate random access to the multiple target cells.
The method according to claim 1, wherein when the terminal device has initiated random access to other target cells, the terminal device determines whether to send to at least one target cell according to the first wireless capability. Initiate random access, including:

If the first wireless capability does not support random access of multiple target cells, the terminal device determines not to initiate random access to the at least one target cell;

If the first wireless capability supports random access of multiple target cells, the terminal device determines to initiate random access to the at least one target cell.
The method according to any one of claims 1 to 3, wherein the method further comprises:

If the random access initiated by the terminal device to multiple target cells has not been successful, the terminal device updates the wireless capability of the terminal device from the first wireless capability to the second wireless capability, and the second wireless capability Different from the first wireless capability;

The terminal device performs random access to part of the multiple target cells according to the second wireless capability.
The method according to claim 4, wherein the method further comprises:

The terminal device stops random access to target cells other than the part of the target cells among the plurality of target cells according to the sequence of initiating random access to the plurality of target cells last time.
The method according to any one of claims 1 to 3, wherein the method further comprises:

In the case where the terminal device initiates random access to multiple target cells and successfully accesses the first target cell of the multiple target cells, the terminal device sends a random access to the second target cell of the multiple target cells. The network device of the cell sends instruction information, where the instruction information is used to instruct the second target cell to stop random access to the terminal device.
The method according to claim 6, wherein the sending of instruction information by the terminal device to a network device of a second target cell among the plurality of target cells comprises:

The terminal device sends the indication information to the network device of the second target cell through a radio resource control RRC reconfiguration complete message sent to the network device of the first target cell.
The method according to claim 7, wherein the indication information includes identification information of the second target cell.
The method according to claim 6, wherein the sending of instruction information by the terminal device to a network device of a second target cell among the plurality of target cells comprises:

The terminal device sends the indication information to the network device of the second target cell through the resource indicated in the uplink grant that the network device of the second target cell has allocated for the terminal device.
The method according to claim 9, wherein the terminal device transfers the resource indicated in the uplink grant allocated to the terminal device by the network device of the second target cell to the network of the second target cell. The instruction information sent by the device includes:

If the terminal device receives the RAR message sent by the network device of the second target cell to the terminal device within the random access response RAR window, the terminal device uses the uplink authorization indication in the RAR message Sending the instruction information to the network device of the second target cell.
The method according to claim 10, wherein the method further comprises:

If the terminal device does not receive the RAR message sent by the network device of the second target cell to the terminal device within the random access response RAR window, the terminal device stops re-initiating random access to the second target cell. Access.
The method according to claim 9, characterized in that the terminal equipment transmits the resources indicated by the uplink authorization that the network equipment of the second target cell has allocated for the terminal equipment to the network equipment of the second target cell. Sending the instruction information includes:

If the terminal device receives the contention resolution message sent by the network device of the second target cell to the terminal device before the contention resolution timer expires, the terminal device passes the uplink authorization in the contention resolution message The indicated resource sends the indication information to the network device of the second target cell.
The method of claim 12, wherein the method further comprises:

If the terminal device does not receive the contention resolution message sent by the network device of the second target cell to the terminal device before the contention resolution timer expires, the terminal device stops re-initiating random access to the second target cell. Access.
The method according to any one of claims 1 to 13, wherein the at least one target cell includes a third target cell, and the terminal device determining at least one target cell that can perform random access includes:

In a case where the third target cell satisfies the first condition, the terminal device determines that the third target cell is a target cell capable of random access.
The method of claim 14, wherein the method further comprises:

The terminal device receives a pre-handover command, the pre-handover command includes a candidate target cell configured for the terminal device and the first condition, and the candidate target cell includes the third target cell.
A random access method, characterized in that it comprises:

The terminal equipment initiates random access to multiple target cells;

In the case that the terminal device successfully accesses the first target cell of the multiple target cells, the terminal device sends instruction information to the network device of the second target cell of the multiple target cells, and The indication information is used to instruct the second target cell to stop random access to the terminal device.
The method according to claim 16, wherein the sending of the instruction information by the terminal device to the network device of the second target cell among the plurality of target cells comprises:

The terminal device sends the indication information to the network device of the second target cell through a radio resource control RRC reconfiguration complete message sent to the network device of the first target cell.
The method according to claim 17, wherein the indication information includes identification information of the second target cell.
The method according to claim 16, wherein the sending of the instruction information by the terminal device to the network device of the second target cell among the plurality of target cells comprises:

The terminal device sends the indication information to the network device of the second target cell through the resource indicated in the uplink grant that the network device of the second target cell has allocated for the terminal device.
The method according to claim 19, wherein the terminal device transfers the resources indicated in the uplink grant allocated to the terminal device by the network device of the second target cell to the network of the second target cell. The instruction information sent by the device includes:

If the terminal device receives the RAR message sent by the network device of the second target cell to the terminal device within the random access response RAR window, the terminal device passes the uplink authorization in the RAR message The indicated resource sends the indication information to the network device of the second target cell.
The method of claim 20, wherein the method further comprises:

If the terminal device does not receive the RAR message sent by the network device of the second target cell to the terminal device within the random access response RAR window, the terminal device stops re-initiating random access to the second target cell. Access.
The method according to claim 19, wherein the terminal device transfers the resources indicated in the uplink grant allocated to the terminal device by the network device of the second target cell to the network of the second target cell. The instruction information sent by the device includes:

If the terminal device receives the contention resolution message sent by the second target cell to the terminal device before the contention resolution timer expires, the terminal device passes the information indicated in the uplink grant in the contention resolution message The resource sends the indication information to the network device of the second target cell.
The method according to claim 22, wherein the method further comprises:

If the terminal device does not receive the contention resolution message sent by the network device of the second target cell to the terminal device before the contention resolution timer expires, the terminal device stops re-initiating random access to the second target cell. Access.
A random access method, characterized in that it comprises:

In the case that the terminal device successfully accesses the first target cell, the network device receives instruction information, the instruction information is used to instruct the second target cell to stop random access to the terminal device, and the network device is the Network equipment of the second target cell.
The method according to claim 24, wherein the indication information is carried in a radio resource control RRC reconfiguration complete message sent by the terminal device to the network device of the first target cell, and the network device receives Instructions, including:

The network device receives the indication information sent by the network device of the first target cell.
The method according to claim 25, wherein the indication information includes identification information of the second target cell.
The method according to claim 24, wherein the receiving instruction information by the network device comprises:

The network device receives the indication information through the resource indicated in the uplink grant allocated for the terminal device.
The method according to claim 27, wherein the receiving the indication information by the network device through the resource indicated in the uplink grant allocated for the terminal device comprises:

The network device receives the indication information through the resource indicated in the uplink grant in the random access response RAR message sent to the terminal device.
The method according to claim 27, wherein the receiving of the indication information by the network device through the uplink authorization allocated for the terminal device comprises:

The network device receives the indication information through the resource indicated in the uplink grant in the contention resolution message sent to the terminal device.
A terminal device, characterized in that the terminal device includes:

A processing unit for determining at least one target cell that can perform random access, and

Determine whether to initiate random access to the at least one target cell according to the first wireless capability, where the wireless capability is used to indicate the random access capability of the multi-target cell of the terminal device.
The terminal device according to claim 30, wherein the at least one target cell includes a plurality of target cells, and when the terminal device does not initiate random access to other target cells, the processing unit specifically uses in:

If the first wireless capability does not support random access of multiple target cells, determining to initiate random access to at least one target cell of the multiple target cells;

If the first wireless capability supports random access of multiple target cells, determining to initiate random access to the multiple target cells.
The terminal device according to claim 30, wherein, in a case where the terminal device has initiated random access to another target cell, the processing unit is specifically configured to:

If the first wireless capability does not support random access of multiple target cells, determining not to initiate random access to the at least one target cell;

If the first wireless capability supports random access of multiple target cells, determining to initiate random access to the at least one target cell.
The terminal device according to any one of claims 30 to 32, wherein the processing unit is further configured to:

If the random access initiated by the terminal device to multiple target cells has not been successful, update the wireless capability of the terminal device from the first wireless capability to a second wireless capability, where the second wireless capability is different from the First wireless capability;

The terminal device also includes:

The transceiver unit is configured to perform random access to part of the multiple target cells according to the second wireless capability.
The terminal device according to claim 33, wherein the processing unit is further configured to:

According to the sequence of initiating random access to the multiple target cells last time, stop random access to the target cells except the part of the target cells among the multiple target cells.
The terminal device according to any one of claims 30 to 32, wherein the terminal device further comprises:

The transceiving unit is configured to, when the terminal device initiates random access to multiple target cells and successfully accesses the first target cell of the multiple target cells, send a message to the second one of the multiple target cells. The network device of the target cell sends instruction information, where the instruction information is used to instruct the second target cell to stop random access to the terminal device.
The terminal device according to claim 35, wherein the transceiver unit is specifically configured to:

Sending the indication information to the network device of the second target cell through a radio resource control RRC reconfiguration complete message sent to the network device of the first target cell.
The terminal device according to claim 36, wherein the indication information includes identification information of the second target cell.
The terminal device according to claim 35, wherein the transceiver unit is specifically configured to:

Sending the indication information to the network device of the second target cell through the resource indicated in the uplink grant that the network device of the second target cell has allocated for the terminal device.
The terminal device according to claim 38, wherein the transceiver unit is specifically configured to:

If the terminal device receives the RAR message sent by the network device of the second target cell to the terminal device in the random access response RAR window, the resource indicated by the uplink authorization in the RAR message is sent to the terminal device. The network device of the second target cell sends the indication information.
The terminal device according to claim 39, wherein the processing unit is further configured to:

If the terminal device does not receive the RAR message sent by the network device of the second target cell to the terminal device within the random access response RAR window, stop re-initiating random access to the second target cell.
The terminal device according to claim 38, wherein the transceiver unit is specifically configured to:

If the terminal device receives the contention resolution message sent by the network device of the second target cell to the terminal device before the contention resolution timer expires, the resource direction indicated by the uplink authorization in the contention resolution message The network device of the second target cell sends the indication information.
The terminal device according to claim 41, wherein the processing unit is further configured to:

If the terminal device does not receive the contention resolution message sent by the network device of the second target cell to the terminal device before the contention resolution timer expires, stop re-initiating random access to the second target cell.
The terminal device according to any one of claims 30 to 42, wherein the at least one target cell comprises a third target cell, and the processing unit is specifically configured to:

In a case where the third target cell satisfies the first condition, it is determined that the third target cell is a target cell capable of random access.
The terminal device according to claim 43, wherein the terminal device further comprises:

The transceiver unit is configured to receive a pre-handover command, where the pre-handover command includes a candidate target cell configured for the terminal device and the first condition, and the candidate target cell includes the third target cell.
A terminal device, characterized in that the terminal device includes:

The transceiver unit is used to initiate random access to multiple target cells, and

In the case that the terminal device successfully accesses the first target cell of the multiple target cells, sending instruction information to the network device of the second target cell of the multiple target cells, where the instruction information is used for Instruct the second target cell to stop random access to the terminal device.
The terminal device according to claim 45, wherein the transceiver unit is specifically configured to:

Sending the indication information to the network device of the second target cell through a radio resource control RRC reconfiguration complete message sent to the network device of the first target cell.
The terminal device according to claim 46, wherein the indication information includes identification information of the second target cell.
The terminal device according to claim 45, wherein the transceiver unit is specifically configured to:

Sending the indication information to the network device of the second target cell through the resource indicated in the uplink grant that the network device of the second target cell has allocated for the terminal device.
The terminal device according to claim 48, wherein the transceiver unit is specifically configured to:

If the terminal device receives the RAR message sent by the network device of the second target cell to the terminal device within the random access response RAR window, the resource direction indicated in the uplink grant in the RAR message The network device of the second target cell sends the indication information.
The terminal device of claim 49, wherein the terminal device further comprises:

A processing unit, configured to stop re-initiating to the second target cell if the terminal device does not receive the RAR message sent by the network device of the second target cell to the terminal device within the random access response RAR window Random access.
The terminal device according to claim 48, wherein the transceiver unit is specifically configured to:

If the terminal device receives the contention resolution message sent by the second target cell to the terminal device before the contention resolution timer expires, the resource indicated in the uplink grant in the contention resolution message is sent to the The network device of the second target cell sends the indication information.
The terminal device of claim 51, wherein the terminal device further comprises:

A processing unit, configured to stop re-initiating a contention resolution message to the second target cell if the terminal device does not receive the contention resolution message sent to the terminal device by the network device of the second target cell before the contention resolution timer expires Random access.
A network device, characterized in that, the network device includes:

The transceiver unit is configured to receive indication information when the terminal device successfully accesses the first target cell, where the indication information is used to instruct the second target cell to stop random access to the terminal device, the network device Is the network device of the second target cell.
The network device according to claim 53, wherein the indication information is carried in a radio resource control RRC reconfiguration complete message sent by the terminal device to the network device of the first target cell, and the transceiver unit Specifically used for:

Receiving the indication information sent by the network device of the first target cell.
The network device according to claim 54, wherein the indication information comprises identification information of the second target cell.
The network device according to claim 53, wherein the transceiver unit is specifically configured to:

Receiving the indication information through the resource indicated in the uplink grant allocated for the terminal device.
The network device according to claim 56, wherein the transceiver unit is specifically configured to:

Receiving the indication information by using the resource indicated in the uplink grant in the random access response RAR message sent to the terminal device.
The network device according to claim 56, wherein the transceiver unit is specifically configured to:

Receiving the indication information by using the resource indicated in the uplink grant in the contention resolution message sent to the terminal device.
A terminal device, comprising: a processor and a memory, the memory is used to store a computer program, the processor is used to call and run the computer program stored in the memory, and execute any one of claims 1 to 15 The method described in one item.
A terminal device, characterized by comprising: a processor and a memory, the memory is used to store a computer program, the processor is used to call and run the computer program stored in the memory, and execute any of claims 16 to 23 The method described in one item.
A network device, comprising: a processor and a memory, the memory is used to store a computer program, the processor is used to call and run the computer program stored in the memory, and execute any of claims 24 to 29 The method described in one item.
A chip, characterized by comprising: a processor, configured to call and run a computer program from a memory, so that a device installed with the chip executes the method according to any one of claims 1 to 15.
A chip, characterized by comprising: a processor, configured to call and run a computer program from a memory, so that a device installed with the chip executes the method according to any one of claims 16 to 23.
A chip, characterized by comprising: a processor, configured to call and run a computer program from a memory, so that a device installed with the chip executes the method according to any one of claims 24 to 29.
A computer-readable storage medium, characterized in that it is used to store a computer program that enables a computer to execute the method according to any one of claims 1 to 15.
A computer-readable storage medium, characterized in that it is used to store a computer program that enables a computer to execute the method according to any one of claims 16 to 23.
A computer-readable storage medium, characterized in that it is used to store a computer program that enables a computer to execute the method according to any one of claims 24 to 29.
A computer program product, characterized by comprising computer program instructions, which cause a computer to execute the method according to any one of claims 1 to 15.
A computer program product, characterized by comprising computer program instructions, which cause a computer to execute the method according to any one of claims 16 to 23.
A computer program product, characterized by comprising computer program instructions, which cause a computer to execute the method according to any one of claims 24 to 29.
A computer program, wherein the computer program causes a computer to execute the method according to any one of claims 1 to 15.
A computer program, wherein the computer program causes a computer to execute the method according to any one of claims 16 to 23.
A computer program, wherein the computer program causes a computer to execute the method according to any one of claims 24 to 29.