CN112740806A

CN112740806A - Random access method, terminal equipment and network equipment

Info

Publication number: CN112740806A
Application number: CN201980060680.7A
Authority: CN
Inventors: 尤心; 卢前溪
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-02-13
Filing date: 2019-02-13
Publication date: 2021-04-30
Anticipated expiration: 2039-02-13
Also published as: WO2020164026A1; CN112740806B

Abstract

The embodiment of the application discloses a random access method, terminal equipment and network equipment, wherein the method comprises the following steps: the terminal equipment determines at least one target cell capable of random access; and the terminal equipment determines whether to initiate random access to the at least one target cell according to a first wireless capability, wherein the wireless capability is used for indicating the random access capability of the multi-target cell of the terminal equipment. The method, the terminal device and the network device in the embodiment of the application are beneficial to improving the probability of random access of the terminal device, thereby shortening the time delay of the random access process and improving the user experience.

Description

Random access method, terminal equipment and network equipment

Technical Field

The embodiment of the application relates to the field of communication, in particular to a random access method, terminal equipment and network equipment.

Background

In the related art, a terminal device may initiate a random access to a target cell under the configuration of a network, and if the random access fails, the terminal device may attempt to initiate a random access process to the same target cell again or reselect a target cell, which may result in a long delay of the random access and poor user experience.

Disclosure of Invention

The embodiment of the application provides a random access method, terminal equipment and network equipment, which are beneficial to improving the probability of success of random access of the terminal equipment, thereby shortening the time delay of the random access process and improving the user experience.

In a first aspect, a method for random access is provided, where the method includes: the terminal equipment determines at least one target cell capable of random access; and the terminal equipment determines whether to initiate random access to the at least one target cell according to a first wireless capability, wherein the wireless capability is used for indicating the random access capability of the multi-target cell of the terminal equipment.

In a second aspect, a method for random access is provided, the method comprising: the terminal equipment initiates random access to a plurality of target cells; and under the condition that the terminal equipment is successfully accessed to a first target cell in the target cells, the terminal equipment sends indication information to network equipment of a second target cell in the target cells, wherein the indication information is used for indicating the second target cell to stop random access to the terminal equipment.

In a third aspect, a method for random access is provided, where the method includes: under the condition that the terminal equipment is successfully accessed to the first target cell, the network equipment receives indication information, wherein the indication information is used for indicating a second target cell to stop random access to the terminal equipment, and the network equipment is network equipment of the second target cell.

In a fourth aspect, a terminal device is provided, configured to perform the method in any one of the first to second aspects or implementations thereof.

Specifically, the terminal device includes a functional module configured to execute the method in any one of the first aspect to the second aspect or each implementation manner thereof.

In a fifth aspect, a network device is provided that includes a processor and a memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory, and executing the method in the third aspect or each implementation manner thereof.

In a sixth aspect, a chip is provided for implementing the method in any one of the first to third aspects or implementations thereof.

Specifically, the chip includes: a processor configured to call and run the computer program from the memory, so that the device on which the chip is installed performs the method according to any one of the first to third aspects or the implementation manners thereof.

In a seventh aspect, a computer-readable storage medium is provided for storing a computer program, where the computer program makes a computer execute the method in any one of the first to third aspects or its implementation manners.

In an eighth aspect, there is provided a computer program product comprising computer program instructions to cause a computer to perform the method of any one of the first to third aspects or implementations thereof.

A ninth aspect provides a computer program which, when run on a computer, causes the computer to perform the method of any one of the first to third aspects or implementations thereof.

By the technical scheme, the terminal equipment determines whether to initiate random access to at least one target cell according to the wireless capacity, so that the terminal equipment can initiate random access to a plurality of target cells in parallel, the probability of random access of the terminal equipment is improved, the time delay of the random access process is shortened, and the user experience is improved.

Drawings

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

Fig. 2 is a schematic diagram of a contention-based random access procedure.

Fig. 3 is a schematic diagram of a non-contention based random access procedure.

Fig. 4 is a schematic diagram of a switching flow based on an Xn interface.

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

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

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

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

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

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

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

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

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

Fig. 14 is a schematic block diagram of a chip provided in an embodiment of the present application.

Fig. 15 is a schematic block diagram of a communication system according to an embodiment of the present application.

Detailed Description

Technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be understood that the technical solutions of the embodiments of the present application may be applied to various communication systems, for example: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a long term evolution LTE System, a LTE Frequency Division Duplex (FDD) System, a LTE Time Division Duplex (TDD), a Universal Mobile telecommunications System (Universal Mobile telecommunications System, UMTS), a UMTS Worldwide Interoperability for Microwave Access (WiMAX) communication System, a New Radio (New Radio, NR), a future 5G System, and the like.

In particular, the technical solution of the embodiment of the present application may be applied to various communication systems based on a non-orthogonal Multiple Access technology, such as a Sparse Code Multiple Access (SCMA) system, a Low Density Signature (LDS) system, and the like, and certainly the SCMA system and the LDS system may also be called other names in the communication field; further, the technical solution of the embodiment of the present application may be applied to a Multi-Carrier transmission system using a non-Orthogonal multiple access technology, for example, an Orthogonal Frequency Division Multiplexing (OFDM) using a non-Orthogonal multiple access technology, a Filter Bank Multi-Carrier (FBMC), a General Frequency Division Multiplexing (GFDM), a Filtered Orthogonal Frequency Division Multiplexing (F-OFDM) system, and the like.

Illustratively, a 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 referred to as a communication terminal, a terminal). Network device 110 may provide communication coverage for a particular geographic area and may communicate with terminal devices located within that coverage area. Optionally, the Network device 110 may be a Base Transceiver Station (BTS) in a GSM system or a CDMA system, a Base Station (NodeB, NB) in a WCDMA system, an evolved Node B (eNB or eNodeB) in an LTE system, or a wireless controller in a Cloud Radio Access Network (CRAN), or a Network device in a Mobile switching center, a relay Station, an Access point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router, a Network device gNB in a 5G Network, or a Network device in a Public Land Mobile Network (PLMN) for future evolution, or the like.

The communication system 100 further comprises 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), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a User terminal, a wireless communication device, a User agent, or a User device. The access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with Wireless communication function, a computing device or other processing device connected to a Wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G Network or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, and the embodiments of the present invention are not limited thereto.

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

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

Fig. 1 exemplarily shows one network device and two terminal devices, and optionally, the communication system 100 may include a plurality of network devices and may include other numbers of terminal devices within the coverage of each network device, which is not limited in this embodiment of the present application.

Optionally, the communication system 100 may further include other network entities such as a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

It should be understood that a device having a communication function in a network/system in the embodiments of the present application may be referred to as a communication device. 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 having a communication function, and the network device 110 and the terminal device 120 may be the specific devices described above and are not described herein again; the communication device may also include other devices in the communication system 100, such as other network entities, for example, a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

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

In the NR system, the trigger condition for random access may include the following:

1. and RRC connection establishment, wherein when the terminal equipment is switched from an idle state to a connected state, the terminal equipment can initiate random access.

2. And RRC connection reestablishment, wherein when the RRC connection is required to be reestablished by the terminal equipment after the radio link fails, the UE can initiate random access.

3. When the terminal equipment is switched, the terminal equipment initiates random access in a target cell.

4. When the terminal device is in a connected state, the network device has downlink data to transmit to the terminal device, and determines that the terminal device is in an uplink out-of-step state (the network device maintains an uplink timer, and if the uplink timer is overtime and the network device does not receive a sounding reference signal of the terminal device, the network device considers that the terminal device is in uplink out-of-step), the network device controls the terminal device to initiate random access.

5. When the terminal equipment is in a connection state, the terminal equipment has uplink data to be transmitted to the network equipment, the fact that the terminal equipment is in an uplink out-of-step state is confirmed (the network equipment maintains an uplink timer, if the uplink timer is overtime and the terminal equipment does not receive a command of the network equipment for adjusting Timing Advance (TA), the terminal equipment considers that the terminal equipment is in uplink out-of-step), and the terminal equipment initiates random access.

6. When the terminal equipment is in a connected state, the terminal equipment initiates random access under the condition that TA is needed for positioning.

For ease of understanding, the random access procedure will be briefly described below in conjunction with fig. 2 and 3.

Fig. 2 illustrates a contention-based random access procedure. The method comprises the following specific steps: 1. the terminal device sends MSG1, i.e. sends a preamble, to the network device. 2. The network device sends MSG2, i.e. a Random Access Response (RAR), to the terminal device. 3. The terminal device transmits MSG3, i.e. starts the first scheduled transmission on the uplink data channel. 4. The network sends MSG4 to the terminal device for feeding back the conflict resolution information to the terminal device terminal. Among them, MSG1 is L1 message, MSG2 and MSG4 are L2, i.e., Media Access Control (MAC) message, and MSG3 is RRC message or MAC message. MSG1 and MSG2 may not use Hybrid Automatic Repeat Request (HARQ), while MSG3 and MSG4 use HARQ transmission. If one random access fails, the UE can initiate the next random access attempt until the maximum retransmission number allowed by the network side is reached. The success time of random access can be long or short depending on the number of random access attempts.

Fig. 3 illustrates a non-contention based random access procedure. The method comprises the following specific steps: 1. the network device sends MSG0, i.e. the random access preamble assignment, to the terminal device. 2. The terminal device sends MSG1, i.e. preamble, to the network device. 3. The network device sends MSG2, i.e. RAR, to the terminal device. Among them, MSG0 and MSG1 are L1 messages and MSG2 is L2, i.e., MAC messages. In the non-contention random access process, the resource of the non-contention random access is acquired through an RRC signaling or a Physical Downlink Control Channel (PDCCH) command (order).

Currently, with the pursuit of speed, delay, high speed mobility, energy efficiency, and the diversity and complexity of services in future life, the 3rd Generation Partnership Project (3 GPP) international standard organization has begun to develop 5G for this purpose. The main application scenarios of 5G are: enhanced Mobile Ultra wide band (eMBB), Low-Latency and high-reliability Communication (URLLC), and massive Machine Type Communication (mMTC).

The eMBB still targets users to obtain multimedia content, services and data, and its demand is growing very rapidly. On the other hand, because the eMBB may be deployed in different scenarios, such as indoor, urban, rural, etc., and the difference between the capabilities and the requirements is relatively large, it cannot be said in a general way, and it is necessary to analyze in detail in combination with a specific deployment scenario. Typical applications of URLLC include: industrial automation, electric power automation, remote medical operation (surgery), traffic safety, and the like. Typical characteristics of mtc include: high connection density, small data volume, insensitive time delay service, low cost and long service life of the module, etc.

Similar to the LTE system, the NR system supports a handover procedure of a connected UE. When a user using network service moves from one cell to another cell, or due to the reasons of adjustment of wireless transmission service load, activation of operation maintenance, equipment failure and the like, in order to ensure the continuity of communication and the quality of service, the system needs to transfer the communication link between the user and the original cell to a new cell, i.e. to perform a handover process.

Fig. 4 shows a schematic diagram of a handover procedure in NR. As shown in fig. 4, the handover procedure includes 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 is used to assist the source gNB in making handover decision. And the UE carries out measurement reporting according to the measurement configuration.

Step 2: and the source gNB refers to the measurement report result of the UE and carries out switching judgment according to the switching algorithm of the source gNB.

And step 3: the method comprises the steps that a source gNB sends a handover request message to a target gNB, wherein the message contains relevant information of handover preparation, and mainly comprises X2/Xn and S1/N2 signaling context reference of UE, a target cell identifier, a security key, an RRC context, Access Stratum (AS) configuration, Evolved-Universal mobile telecommunications system Terrestrial Radio Access (E-UTRAN) Radio Access Bearer (E-UTRAN Radio Access, E-RAB) context and the like. And simultaneously, the method also comprises a source cell physical layer identifier and a message authentication verification code, and is used for a recovery process after possible switching failure. The X2/Xn and S1/N2 signaling context references of the UE may help the target gNB find the location of the source gNB. The E-RAB context includes necessary Radio Network Layer (RLN) and Transport Layer (TNL) addressing information, Quality of Service (QoS) information of the E-RAB, and the like.

And 4, step 4: and the target gNB performs admission control according to the received E-RAB QoS information so as to improve the success rate of switching. The admission control considers reserving corresponding resources, Cell Radio Network Temporary Identifier (C-RNTI), allocating dedicated random access Preamble codes, and the like. The AS configuration used by the target cell may be a complete configuration completely independent of the source cell, or an incremental configuration based on the source cell (the incremental configuration refers to that the same part is not configured, and different parts are reconfigured only by signaling, and the UE will continue to use the original configuration for the configuration that is not received).

And 5: the target gNB prepares for L1/L2 for handover while sending 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 may be sent to the UE in a transparent manner (without any modification). The handover command includes a new C-RNTI and a case algorithm identifier of the target gNB, and may also carry a random access dedicated Preamble code, an access parameter, system information, and the like. Data forwarding may be started when the source gNB receives the handover request ACK message or forwards the handover command to the UE.

Step 6: a handover indication is performed. Specifically, the source gNB sends a handover command to the terminal device, where the handover command carries an RRC connection reconfiguration message of the mobility control information and is generated by the target gNB. The source gbb performs the necessary encryption and integrity protection for this message. After receiving the message, the UE initiates a handover procedure using the relevant parameters in the message. The UE may initiate the handover procedure without waiting for an HARQ/Automatic Repeat reQuest (ARQ) response from the lower layer to the source gNB.

Optionally, after receiving the handover command, the UE performs synchronization with the target cell, and if a random access dedicated Preamble code is configured in the handover command, accesses the target cell using a non-contention random access procedure, and if no dedicated Preamble code is configured, accesses the target cell using a contention random access procedure. And the UE calculates a key required to be used by the target gNB and configures a security algorithm selected by the network and used by the target gNB for communication with the target gNB after successful handover.

And 7: the source gNB sends a Sequence Number (SN) status transmission message to the target gNB, and transmits a Packet Data Convergence Protocol (PDCP) SN receiving status and a downlink PDCP SN sending status of the E-RAB. 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 SNs of missing uplink SDUs that cause reception out-of-sequence, expressed in the form of a bit map (if any, may require retransmission by the UE in the target cell). The downlink PDCP SN transmission status indicates the next SDU sequence number that should be assigned at the target gNB. The source gNB may omit this message if no E-RAB needs to deliver status reports for PDCP.

At this time, the source gNB may transmit uplink data received from the UE to the target gNB, or may transmit downlink data received from a User Plane Function (UPF) entity to the UE. The target gNB buffers the downstream data received from the source gNB.

And 8: and after the UE is successfully accessed into the target cell, the UE sends an RRC connection reconfiguration completion message and confirms that the switching process is completed to the target gNB. The message may also be accompanied by an improvement in the Buffer Status Report (BSR) if resources allow. And the target gNB confirms that the switching is successful by receiving the RRC connection reconfiguration completion message. To this end, the target gNB may start transmitting data to the UE.

And step 9: the target gNB sends a path switch request message to an Access and Mobility Management (AMF) entity to inform the UE that the cell is changed. At this point, the air interface switch is successfully completed.

Step 10: and updating the user plane, specifically, sending a user plane update request message to the UPF by the AMF. The UPF may switch the downlink data path to the target gNB side. And the UPF sends a user plane update response message to the AMF.

Alternatively, the AMF may send one or more end marker (end marker) packets to the source gNB on the old path, and may then release the user plane resources of the source gNB.

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

Step 12: and the target gNB sends a UE context release message to the source gNB to inform the source gNB of successful switching and trigger resource release of the source gNB. The target gbb sends this message after receiving the path switch ACK message sent back from the AMF.

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

The method for random access provided by the embodiment of the application is mainly applied to the switching scene. In the prior art, a UE may measure multiple target cells and report measurement results of the multiple target cells to a source gNB, where the source gNB may initiate handover preparation/request messages for the multiple target cells simultaneously or sequentially according to the measurement results of the multiple target cells reported by the UE (the handover preparation/request messages may be based on a direct-connection X2/Xn interface or through an S1/N2 interface with a Mobility Management Entity (MME)/AMF). After receiving the handover preparation/request message, each target cell performs access control according to its own RRM algorithm, and sends a handover request response message (which carries a handover command generated by the target cell if the access control fails to respond to the handover request failure message) to the base station where the source cell is located on the premise of passing the access control. The source base station selects one of the target cells returning the switching response as a final switching target cell according to a Radio Resource Management (RRM) algorithm of the source base station, and sends a switching command corresponding to the target cell to the UE through an RRC reconfiguration message, so that the network can completely control the switching process.

As can be seen from the above description, the UE initiates the handover procedure to only one target cell under the configuration of the network, and if the handover fails, the UE triggers the RRC connection reestablishment procedure. The RRC connection re-establishment procedure involves new cell selection, and additional delay will be introduced in the subsequent re-establishment procedure signaling, resulting in longer service interruption and affecting user experience.

With the evolution of Carrier Aggregation (CA) and Dual-Connectivity (DC) technologies, terminal devices supporting Dual UpLink (UL) are becoming more and more popular, which also provides convenience for mobility enhancement.

Fig. 5 shows a schematic block diagram of a method 200 of random access of an embodiment of the application. As shown in fig. 5, the method 200 may be performed by a terminal device, and may include some or all of the following:

s210, the terminal equipment determines at least one target cell capable of random access;

s220, the terminal equipment determines whether to initiate random access to the at least one target cell according to a first wireless capability, wherein the wireless capability is used for indicating the random access capability of the multi-target cell of the terminal equipment.

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

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

It should also be understood that the wireless capabilities may include, but are not limited to, at least one of the following: carrier aggregation capability, maximum power limit, radio frequency capability, etc. of the terminal device. For example, different carriers and different frequency points are used in different target cells. And the terminal equipment determines whether to parallelly initiate random access to a plurality of target cells according to whether the carrier aggregation is supported or not. For another example, the maximum power limit for initiating random access to one target cell is P0, and the maximum power limit for initiating random access to multiple target cells in parallel is P1, and the terminal device determines whether to initiate random access to multiple target cells in parallel according to the configured maximum power limit. 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 stored in the terminal device and updated last time.

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

Optionally, the method 200 of the embodiment of the present application may also be applied to a scenario in which the terminal device has initiated random access to another target cell currently. For example, the terminal device determines that one target cell satisfies the condition during handover, and after initiating the random access, another target cell also satisfies the condition, and the terminal device may also determine whether the random access can be initiated to the target cell that satisfies the condition later according to the radio capability. If the wireless capability of the terminal equipment supports the random access of the multiple target cells at the moment, the terminal equipment can initiate the random access to the target cells which meet the conditions. If the wireless capability of the terminal equipment does not support the random access of the multi-target cells at this time, the terminal equipment can not initiate the random access to the target cells which meet the conditions.

It should be appreciated that the radio capability of the terminal device may be updated in real time, for example, the radio capability of the terminal device is updated from supporting random access of multiple target cells to not supporting random access of multiple target cells. As 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.

That is, the terminal device determines whether to initiate random access to at least one target cell according to the wireless capability, and may determine whether to support random access of the at least one target cell in addition to or in combination with determining whether to support random access of multiple target cells.

Three target cells (cells) are obtained by the terminal equipment: cell1, cell2, and cell3 are examples describing method 200. The terminal device first measures the cell1, the cell2, and the cell3, for example, performs RRC measurement, and if the measurement results of the cell1 and the cell2 satisfy the condition, the terminal device determines whether the wireless capability of the terminal device supports initiating random access to the cell1 and the cell2 at the same time. If the wireless capability supports simultaneous access, the terminal device may initiate random access to cell1 and cell2 simultaneously. If the wireless capability does not support the simultaneous access, the terminal device selects one of the cells 1 and 2 to initiate the random access.

It should be noted that, in the embodiment of the present application, the simultaneous initiation of the random access refers to overlapping of the entire random access procedures, and does not refer to only overlapping of start times of the random access procedures.

If the subsequent terminal device measures the cell3 again and the measurement result of the cell3 meets the trigger condition, the terminal device may continue to determine whether the wireless capability supports initiating the random access to the cell3 at the same time. If the wireless capability supports simultaneous access, the terminal device may continue to initiate random access to the cell3, and if the wireless capability does not support simultaneous access, the terminal device does not initiate random access to the cell 3.

As can be seen from the above, the determining, by the terminal device, at least one target cell capable of performing random access may include determining, as the at least one target cell, a target cell that satisfies a condition.

For the problems of frequent handover and easy failure of handover in high-speed mobile scenarios and high-frequency deployment scenarios, 3GPP is currently discussing to introduce a handover procedure based on condition triggering for LTE and NR systems. The basic principle is that the terminal equipment executes the switching to the target cell according to the pre-configured switching command (namely, triggers the random access process and sends the switching completion message) when evaluating the condition trigger related to the target cell according to the condition configured on the network side, thereby avoiding the problem that the high-speed movement enters the coverage area to be too late or unable to send the measurement report and receive the switching command.

That is, the terminal device may receive a pre-handover command for one or more target cells (hereinafter, may be referred to as candidate target cells), where the pre-handover command may include a preamble, resources for sending the preamble, and the like, and may further include a trigger condition. It should be understood that the trigger condition may be a threshold for comparison by the target cell, or a threshold for comparison by the source cell, or a threshold for joint comparison by the source cell and the target cell. For the candidate target cells, the triggering condition may be the same, or different triggering conditions may be configured for different candidate target cells.

Alternatively, the trigger condition may be a threshold value compared to the measurement result. The terminal device may first perform measurements on the candidate target cells and compare the measurement results with a threshold value.

Optionally, the triggering condition may also be a threshold value compared with a distance between the candidate target cell and the location of the terminal device, and then the terminal device may first obtain the location of the candidate target cell and the location of itself, and compare the distance between the candidate target cell and the location of itself with the threshold value.

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 an embodiment of the present application, the method further includes: if the random access initiated by the terminal equipment to a plurality of target cells is not successful, the terminal equipment updates the wireless capability of the terminal equipment from the first wireless capability to a second wireless capability, wherein the second wireless capability is different from the first wireless capability; and the terminal equipment performs random access to part of the target cells in the plurality of target cells according to the second wireless capability.

The random access initiated by the terminal device to the multiple target cells has not been successful yet, which may be that the random access initiated to the multiple target cells has not been failed yet, but has not been successfully accessed to any one of the target cells. For example, the terminal device may start a timer while initiating random access to the earliest target cell, and if the timer is not successfully accessed to any one target cell before the time-out, including the random access failure or the random access procedure is not finished, the terminal device may consider that the random access initiated to the multiple target cells is not successful.

Here, the terminal device updates the wireless capability, and may refer to reducing the wireless capability. For example, the physical layer inside the terminal device may indicate a new constraint 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 an internal implementation of the terminal device. For example, the capability of initiating random access to multiple target cells at the same time is reduced due to vehicle-to-other (V2X) service in which a Sidelink (SL) frequency band is newly added to the terminal device.

The terminal device may perform random access to some target cells of the plurality of target cells according to the updated wireless capability. In other words, the terminal device stops random access to some of the plurality of target cells. For example, the terminal device may stop random access to some target cells of the plurality of target cells according to an order of random access initiated to the plurality of target cells at a previous time. Taking the example that the terminal device has initiated random access to the cell1, the cell2, and the cell3 and the random access has not been successful, at this time, the physical layer may indicate that a new restriction condition is generated by the MAC layer or the RRC layer, that is, the radio capability is reduced, so that the terminal device cannot perform random access on the cell1, the cell2, and the cell3 at the same time, the terminal device stops the random access process started at the latest (for example, the cell3), and if the terminal device has not successfully accessed the target cell which continues to perform random access, the terminal device may continue to stop the random access process started at the next latest, and so on. If there is a case (such as cell1 and cell2) where the random access procedure is started at the same time, the terminal device may select one of the cells to stop performing the random access until the terminal device can successfully access the target cell for continuing the random access.

Optionally, in an embodiment of the present application, the method further includes: the method comprises the steps that under the condition that the terminal equipment initiates random access to a plurality of target cells and successfully accesses a first target cell in the target cells, the terminal equipment sends indication information to network equipment of a second target cell in the target cells, and the indication information is used for indicating the second target cell to stop random access to the terminal equipment.

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 may indicate to the network devices of other target cells to stop performing random access on the terminal device. Therefore, the network equipment of other target cells can stop unnecessary random access processes in time, wireless resources are prevented from being continuously allocated to the terminal equipment, and resource waste of a network side can be reduced as much as possible.

It should be understood that the terminal device may determine whether to initiate random access to multiple target cells without according to its own wireless capability, and may default that the terminal device supports random access of multiple target cells, that is, the terminal device may directly initiate random access to multiple target cells.

Optionally, in this embodiment of the present application, the sending, by the terminal device, indication information to a network device of a second target cell in the multiple target cells includes: and the terminal equipment sends the indication information to the network equipment of the second target cell through a Radio Resource Control (RRC) reconfiguration completion message sent to the network equipment of the first target cell.

For example, the pre-handover command configured for the terminal device includes candidate target cells cell1, cell2, and cell 3. Then, according to the RRC measurement result of the terminal device, the cell1 and the cell2 simultaneously or sequentially satisfy the trigger condition, and at this time, the terminal device initiates random access to the cell1 and the cell2 (same frequency or different frequency) simultaneously or sequentially. If the random access of the Cell1 is successful and the random access of the Cell2 is still ongoing, the terminal device may report, in an RRC reconfiguration complete message sent to the network device of the Cell1, identification information (e.g., Cell2) of other target cells undergoing random access, including but not limited to Physical Cell Identity (PCI) and frequency point information, or Cell Global Identifier (Cell Global Identifier) CGI information, and the like. The terminal device may simultaneously stop the random access procedure to the cell 2. After receiving the identification information of the Cell2, the network device of the Cell1 stops the random access process and resource allocation to the UE through the network device of the Cell 2.

It should be understood that, in the embodiment of the present application, the respective network devices of at least one target cell may be the same or different. For example, the network device of the cell1 is the same as the network device of the cell2, and the network device of the cell1 receives the RRC reconfiguration complete message sent by the terminal device, and may directly stop the random access process performed by the cell2 to the terminal device according to the identification information of the cell2 carried in the RRC reconfiguration complete message. The respective 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 sending, by the terminal device, indication information to a network device of a second target cell in the multiple target cells includes: and the terminal equipment sends the indication information to the network equipment of the second target cell through the resource indicated in the uplink authorization allocated to the terminal equipment by the network equipment of the second target cell.

For example, the pre-handover command configured for the terminal device includes candidate target cells cell1, cell2, and cell 3. Then, according to the RRC measurement result of the terminal device, the cell1 and the cell2 simultaneously or sequentially satisfy the trigger condition, and at this time, the terminal device initiates random access to the cell1 and the cell2 (same frequency or different frequency) simultaneously or sequentially. If the random access of the cell1 is successful and the random access of the cell2 is still in progress, the terminal device sends an RRC reconfiguration complete message to the cell1, and the terminal device continues the random access process of the cell2 at the same time, and it may send the indication information to the network device of the cell2 by the following method:

the first method is as follows: if the terminal device has sent the preamble in the cell2 and is waiting for the RAR message at this time, the terminal device continues to wait for the RAR message. If the RAR message is received in the RAR window (window), the UE notifies the network device of cell2 of the resource sending indication information of the uplink grant indication allocated in the RAR message for the terminal device, which is sent by the network device of cell2, that the terminal device has successfully accessed to another target cell, and requests the network device of cell2 to release the configuration and the resource. The indication information may be notified by a new MAC Control Element (CE); if the RAR message is not received in the RAR window, the terminal device does not try new preamble transmission any more, that is, does not initiate random access to the cell2 any more, and terminates the random access process.

The second method comprises the following steps: if at this point the terminal device is performing contention-based random access in cell2 and has sent a scheduled transmission that is waiting for a 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 notifies the network device of the cell2 of the indication information sent by the resource indicated by the uplink grant allocated in the contention resolution message, and the terminal device has successfully accessed to another target cell and requests the network to release the configuration and the resource. The indication information may be notified by a new MAC CE; if the contention resolution message is not received before the contention resolution timer times out, the terminal device does not try a new preamble transmission, i.e., does not initiate random access to the cell2, and terminates the random access procedure.

Fig. 6 shows a schematic block diagram of a method 300 of random access of an embodiment of the application. As shown in fig. 6, the method 300 may be performed by a terminal device, and may include some or all of the following:

s310, the terminal equipment initiates random access to a plurality of target cells;

s320, in a case that the terminal device successfully accesses the first target cell of the target cells, the terminal device sends indication information to a network device of a second target cell of the target cells, where the indication information is used to indicate the second target cell to stop performing random access on 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 sending, by the terminal device, 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 to the terminal device, includes: if the terminal device receives an RAR message sent to the terminal device by the network device of the second target cell within a Random Access Response (RAR) window, the terminal device sends 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 an embodiment of the present application, the method further includes: and if the terminal equipment does not receive the RAR message sent to the terminal equipment by the network equipment of the second target cell in a Random Access Response (RAR) window, the terminal equipment stops initiating random access to the second target cell again.

Optionally, in this embodiment of the present application, the sending, by the terminal device, 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 to the terminal device, includes: if the terminal device receives a contention resolution message sent by the second target cell to the terminal device before the contention resolution timer is overtime, the terminal device sends 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 an embodiment of the present application, the method further includes: and if the terminal equipment does not receive the competition resolving message sent to the terminal equipment by the network equipment of the second target cell before the competition resolving timer is overtime, the terminal equipment stops initiating random access to the second target cell again.

Fig. 7 shows a schematic block diagram of a method 400 of random access of an embodiment of the application. As shown in fig. 7, the method 400 may be performed by a terminal device, and may include some or all of the following:

s410, under the condition that the terminal device is successfully accessed to the first target cell, the network device receives indication information, wherein the indication information is used for indicating a second target cell to stop random access to the terminal device, and the network device is the network device of the second target cell.

Optionally, in this embodiment of the 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 receiving, by the network device, the indication information includes: and the network equipment receives the indication information sent by the network equipment of the first target cell.

Optionally, in this embodiment of the present application, the receiving, by the network device, the indication information includes: and the network equipment receives the indication information through the resources indicated in the uplink authorization allocated to the terminal equipment.

Optionally, in this embodiment of the present application, the receiving, by the network device, the indication information through a resource indicated in an uplink grant allocated to the terminal device includes: and the network equipment receives the indication information through the resource indicated in the uplink authorization in the Random Access Response (RAR) message sent to the terminal equipment.

Optionally, in this embodiment of the present application, the receiving, by the network device, the indication information through the uplink grant allocated to the terminal device includes: and the network equipment receives the indication information through the resource indicated in the uplink authorization in the competition resolving message sent to the terminal equipment.

It should be understood that the interaction between the network device and the terminal device described by the network device and the related characteristics, functions, etc. correspond to the related characteristics, functions of the terminal device. That is, what message the network device sends to the terminal device, 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 sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The method for random access according to the embodiment of the present application is described above in detail, and an apparatus for random access according to the embodiment of the present application will be described below with reference to fig. 8 to 13, and technical features described in the embodiment of the method are applicable to the following apparatus embodiments.

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

a processing unit 510, configured to determine at least one target cell capable of performing random access, and determine whether to initiate random access to the at least one target cell according to a first radio capability, where the radio capability is used to indicate a random access capability of multiple target cells of the terminal device.

Optionally, in this embodiment of the present application, the at least one target cell includes a plurality of target cells, and the processing unit is specifically configured to, when the terminal device does not initiate random access to another target cell: if the first wireless capability does not support the random access of the multiple target cells, determining to initiate the random access to at least one target cell in the multiple target cells; and if the first wireless capability supports the random access of multiple target cells, determining to initiate the random access to the multiple target cells.

Optionally, in this embodiment of the present application, when 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 the random access of the multi-target cell, determining not to initiate the random access to the at least one target cell; and if the first wireless capability supports the random access of multiple target cells, determining to initiate the random access to the at least one target cell.

Optionally, in an embodiment of the present application, the processing unit is further configured to: if the random access initiated by the terminal equipment to the target cells is not successful, updating the wireless capability of the terminal equipment from the first wireless capability to a second wireless capability, wherein the second wireless capability is different from the first wireless capability; the terminal device further includes: and the transceiver unit is used for carrying out random access to part of the target cells in the plurality of target cells according to the second wireless capability.

Optionally, in an embodiment of the present application, the processing unit is further configured to: and stopping the random access to the target cells except the part of the target cells in the plurality of target cells according to the sequence of initiating the random access to the plurality of target cells at the previous time.

Optionally, in this embodiment of the present application, the terminal device further includes: a transceiver unit, configured to send indication information to a network device of a second target cell in the multiple target cells when the terminal device initiates random access to the multiple target cells and successfully accesses a first target cell in the multiple target cells, where the indication information is used to indicate the second target cell to stop random access to the terminal device.

Optionally, in this embodiment of the present application, the transceiver unit is specifically configured to: and sending the indication information to the network equipment of the second target cell through a Radio Resource Control (RRC) reconfiguration complete message sent to the network equipment of the first target cell.

Optionally, in this embodiment of the present application, the transceiver unit is specifically configured to: and sending the indication information to the network equipment of the second target cell through the resource indicated in the uplink grant which is allocated to the terminal equipment by the network equipment of the second target cell.

Optionally, in this embodiment of the present application, the transceiver unit is specifically configured to: and if the terminal equipment receives an RAR message sent to the terminal equipment by the network equipment of the second target cell in a Random Access Response (RAR) window, sending the indication information to the network equipment of the second target cell through the resource indicated by the uplink authorization in the RAR message.

Optionally, in an embodiment of the present application, the processing unit is further configured to: and if the terminal equipment does not receive the RAR message sent to the terminal equipment by the network equipment of the second target cell in a Random Access Response (RAR) window, stopping initiating random access to the second target cell again.

Optionally, in this embodiment of the present application, the transceiver unit is specifically configured to: and if the terminal equipment receives a contention resolution message sent to the terminal equipment by the network equipment of the second target cell before the contention resolution timer is overtime, sending the indication information to the network equipment of the second target cell through the resource indicated by the uplink authorization in the contention resolution message.

Optionally, in an embodiment of the present application, the processing unit is further configured to: and if the terminal equipment does not receive the competition resolving message sent to the terminal equipment by the network equipment of the second target cell before the competition resolving timer is overtime, stopping initiating random access to the second target cell again.

Optionally, in this embodiment of the application, the at least one target cell includes a third target cell, and the processing unit is specifically configured to: and under the condition that the third target cell meets a first condition, determining the third target cell as a target cell capable of 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, and 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 embodiment of the method of the present application, and the above and other operations and/or functions of each unit in the terminal device 500 are respectively for implementing the corresponding flow of the terminal device in the method of fig. 5, and are not described herein again for brevity.

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 apparatus 600 includes:

a transceiver unit 610, configured to initiate random access to multiple target cells, and send indication information to a network device of a second target cell in the multiple target cells when the terminal device successfully accesses a first target cell in the multiple target cells, where the indication information is used to indicate the second target cell to stop performing random access on the terminal device.

Optionally, in this embodiment of the present application, the transceiver unit is specifically configured to: and if the terminal equipment receives an RAR message sent to the terminal equipment by the network equipment of the second target cell in a Random Access Response (RAR) window, sending the indication information to the network equipment of the second target cell through the resource indicated in the uplink authorization in the RAR message.

Optionally, in this embodiment of the present application, the terminal device further includes: and the processing unit is configured to stop initiating random access again to the second target cell if the terminal device does not receive the RAR message sent to the terminal device by the network device of the second target cell within a Random Access Response (RAR) window.

Optionally, in this embodiment of the present application, the transceiver unit is specifically configured to: and if the terminal equipment receives a contention resolution message sent by the second target cell to the terminal equipment before the contention resolution timer is overtime, sending the indication information to the network equipment of the second target cell through the resource indicated in the uplink authorization in the contention resolution message.

Optionally, in this embodiment of the present application, the terminal device further includes: and the processing unit is used for stopping initiating random access to the second target cell again if the terminal equipment does not receive the competition resolving message sent to the terminal equipment by the network equipment of the second target cell before the competition resolving timer is overtime.

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 embodiment of the method of the present application, and the above and other operations and/or functions of each unit in the terminal device 600 are respectively for implementing the corresponding flow of the terminal device in the method of fig. 6, and are not described herein again for brevity.

Fig. 10 shows a schematic block diagram of a network device 700 of an embodiment of the application. As shown in fig. 10, the network device 700 includes:

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

Optionally, in this embodiment of the 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: and receiving the indication information sent by the network equipment of the first target cell.

Optionally, in this embodiment of the present application, the transceiver unit is specifically configured to: and receiving the indication information through the resources indicated in the uplink grant allocated to the terminal equipment.

Optionally, in this embodiment of the present application, the transceiver unit is specifically configured to: and receiving the indication information through the resource indicated in the uplink authorization in the Random Access Response (RAR) message sent to the terminal equipment.

Optionally, in this embodiment of the present application, the transceiver unit is specifically configured to: and receiving the indication information through the resource indicated in the uplink grant in the contention resolution message sent to the terminal equipment.

It should be understood that the network device 700 according to the embodiment of the present application may correspond to a network device in an embodiment of the method of the present application, and the above and other operations and/or functions of each unit in the network device 700 are respectively for implementing a corresponding flow of the network device in the method of fig. 7, and are not described herein again for brevity.

As shown in fig. 11, an embodiment of the present application further provides a terminal device 800, where the terminal device 800 may be the terminal device 500 in fig. 8, and can be used to execute the content of the terminal device corresponding to the method 200 in fig. 5. The terminal device 800 shown in fig. 11 includes a processor 810, and the processor 810 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. 11, the terminal device 800 may further include a memory 820. From the memory 820, the processor 810 can call and run a computer program to implement the method in the embodiment of the present application.

The memory 820 may be a separate device from the processor 810 or may be integrated into 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, and specifically, may transmit information or data to the other devices or receive information or data transmitted by the other devices.

The transceiver 830 may include a transmitter and a receiver, among others. The transceiver 830 may further include one or more antennas.

Optionally, the terminal device 800 may be a terminal device according to this embodiment, and the terminal device 800 may implement a corresponding process implemented by the terminal device in each method according to this embodiment, which is not described herein again for brevity.

In a specific embodiment, the processing unit in the terminal device 500 may be implemented by the processor 810 in fig. 11. The transceiving 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 further provides a terminal device 900, where 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. 6. The terminal device 900 shown in fig. 12 includes a processor 910, and the processor 910 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. 12, the terminal device 900 may further include a memory 920. From the memory 920, the processor 910 can call and run a computer program to implement the method in the embodiment of the present application.

The memory 920 may be a separate device from 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, and specifically, may transmit information or data to the other devices or receive information or data transmitted by the other devices.

The transceiver 930 may include a transmitter and a receiver, among others. The transceiver 930 may further include one or more antennas.

Optionally, the terminal device 900 may be a terminal device in this embodiment, and the terminal device 900 may implement a corresponding process implemented by the terminal device in each method in this embodiment, which is not described herein again for brevity.

In a specific embodiment, the processing unit in the terminal device 600 may be implemented by the processor 910 in fig. 12. The transceiving 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 further provides a network device 1000, where 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. 7. 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. From the memory 1020, the processor 1010 may call and execute a computer program to implement the method in the embodiment of the present application.

The memory 1020 may be a separate device from the processor 1010 or may be integrated into 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, and specifically, may transmit information or data to the other devices or receive information or data transmitted by the other devices.

The transceiver 1030 may include a transmitter and a receiver, among others. 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 in the embodiment of the present application, and the network device 1000 may implement a corresponding process implemented by the network device in each method in the embodiment of the present application, which is not described herein again for brevity.

In a particular embodiment, the processing unit in the network device 400 may be implemented by the processor 1010 in fig. 13. The transceiving 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 may call and execute a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 14, the chip 2000 may also include a memory 2020. From the memory 2020, the processor 2010 may call and execute a computer program to implement the method in the embodiment of the present application.

The memory 2020 may be a separate device from the processor 2010 or may be integrated into the processor 2010.

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

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

Optionally, the chip may be applied to the terminal device in the embodiment of the present application, and the chip may implement the corresponding process implemented by the terminal device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Optionally, the chip may be applied to the network device in the embodiment of the present application, and the chip may implement the corresponding process implemented by the network device in each method in the embodiment of the present application, and for brevity, details are not described here again.

It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as 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 according to an embodiment of the present application. As shown in fig. 15, this communication system 3000 includes a network device 3010 and a terminal device 3020.

The network device 3010 may be configured to implement corresponding functions implemented by the network device in the foregoing method, and the terminal device 3020 may be configured to implement corresponding functions implemented by the terminal device in the foregoing method, which is not described herein again for brevity.

It should be understood that the processor of the embodiments of the present application may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The Processor may be a general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of example, but not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic random access memory (DDR SDRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchronous link SDRAM (SLDRAM), and Direct Rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that the above memories are exemplary but not limiting illustrations, for example, the memories in the embodiments of the present application may also be Static Random Access Memory (SRAM), dynamic random access memory (dynamic RAM, DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (enhanced SDRAM, ESDRAM), Synchronous Link DRAM (SLDRAM), Direct Rambus RAM (DR RAM), and the like. That is, the memory in the embodiments of the present application is intended to comprise, without being limited to, these and any other suitable types of memory.

The embodiment of the application also provides a computer readable storage medium for storing the computer program.

Optionally, the computer-readable storage medium may be applied to the network device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the network device in each method in the embodiment of the present application, which is not described herein again for brevity.

Optionally, the computer-readable storage medium may be applied to the terminal device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, which is not described herein again for brevity.

Embodiments of the present application also provide a computer program product comprising 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 enable the computer to execute corresponding processes implemented by the network device in the methods in the embodiment of the present application, which are not described herein again for brevity.

Optionally, the computer program product may be applied to the terminal device in the embodiment of the present application, and the computer program instructions enable the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, which is not described herein again for brevity.

The embodiment of the application also provides a computer program.

Optionally, the computer program may be applied to the network device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute the corresponding process implemented by the network device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Optionally, the computer program may be applied to the terminal device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute the corresponding process implemented by the terminal device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

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

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A method of random access, comprising:

the terminal equipment determines at least one target cell capable of random access;

and the terminal equipment determines whether to initiate random access to the at least one target cell according to a first wireless capability, wherein the wireless capability is used for indicating the random access capability of the multi-target cell of the terminal equipment.
The method of claim 1, wherein the at least one target cell comprises a plurality of target cells, and in a case that the terminal device does not initiate random access to other target cells, the determining, by the terminal device, whether to initiate random access to at least one target cell according to the first radio capability comprises:

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

and if the first wireless capability supports the random access of multiple target cells, the terminal equipment determines to initiate the random access to the multiple target cells.
The method of claim 1, wherein in a case that the terminal device has initiated random access to other target cells, the terminal device determines whether to initiate random access to at least one target cell according to the first radio capability, comprising:

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

and if the first wireless capability supports the random access of multiple target cells, the terminal equipment determines to initiate the random access to at least one target cell.
The method according to any one of claims 1 to 3, further comprising:

if the random access initiated by the terminal equipment to a plurality of target cells is not successful, the terminal equipment updates the wireless capability of the terminal equipment from the first wireless capability to a second wireless capability, wherein the second wireless capability is different from the first wireless capability;

and the terminal equipment performs random access to part of the target cells in the plurality of target cells according to the second wireless capability.
The method of claim 4, further comprising:

and the terminal equipment stops random access to the target cells except the part of the target cells in the plurality of target cells according to the sequence of initiating random access to the target cells at the previous time.
The method according to any one of claims 1 to 3, further comprising:

the method comprises the steps that under the condition that the terminal equipment initiates random access to a plurality of target cells and successfully accesses a first target cell in the target cells, the terminal equipment sends indication information to network equipment of a second target cell in the target cells, and the indication information is used for indicating the second target cell to stop random access to the terminal equipment.
The method of claim 6, wherein the sending, by the terminal device, the indication information to the network device of the second target cell of the plurality of target cells comprises:

and the terminal equipment sends the indication information to the network equipment of the second target cell through a Radio Resource Control (RRC) reconfiguration completion message sent to the network equipment of the first target cell.
The method of claim 7, wherein the indication information comprises identification information of the second target cell.
The method of claim 6, wherein the sending, by the terminal device, the indication information to the network device of the second target cell of the plurality of target cells comprises:

and the terminal equipment sends the indication information to the network equipment of the second target cell through the resource indicated in the uplink authorization allocated to the terminal equipment by the network equipment of the second target cell.
The method according to claim 9, wherein the sending, by the terminal device, the indication information to the network device of the second target cell through the resource indicated in the uplink grant that has been allocated by the network device of the second target cell to the terminal device comprises:

if the terminal device receives an RAR message sent to the terminal device by the network device of the second target cell within a Random Access Response (RAR) window, the terminal device sends the indication information to the network device of the second target cell through the resource indicated by the uplink grant in the RAR message.
The method of claim 10, further comprising:

and if the terminal equipment does not receive the RAR message sent to the terminal equipment by the network equipment of the second target cell in a Random Access Response (RAR) window, the terminal equipment stops initiating random access to the second target cell again.
The method according to claim 9, wherein the sending, by the terminal device, the indication information to the network device of the second target cell through the resource indicated by the uplink grant that has been allocated by the network device of the second target cell to the terminal device comprises:

if the terminal device receives a contention resolution message sent to the terminal device by the network device of the second target cell before the contention resolution timer is overtime, the terminal device sends the indication information to the network device of the second target cell through the resource indicated by the uplink grant in the contention resolution message.
The method of claim 12, further comprising:

and if the terminal equipment does not receive the competition resolving message sent to the terminal equipment by the network equipment of the second target cell before the competition resolving timer is overtime, the terminal equipment stops initiating random access to the second target cell again.
The method according to any of claims 1 to 13, wherein the at least one target cell comprises a third target cell, and wherein the determining, by the terminal device, the at least one target cell capable of random access comprises:

and under the condition that the third target cell meets a first condition, the terminal equipment determines that the third target cell is a target cell capable of random access.
The method of claim 14, further comprising:

the terminal device receives 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 method of random access, comprising:

the terminal equipment initiates random access to a plurality of target cells;

and under the condition that the terminal equipment is successfully accessed to a first target cell in the target cells, the terminal equipment sends indication information to network equipment of a second target cell in the target cells, wherein the indication information is used for indicating the second target cell to stop random access to the terminal equipment.
The method of claim 16, wherein the sending, by the terminal device, the indication information to the network device of the second target cell of the plurality of target cells comprises:

and the terminal equipment sends the indication information to the network equipment of the second target cell through a Radio Resource Control (RRC) reconfiguration completion message sent to the network equipment of the first target cell.
The method of claim 17, wherein the indication information comprises identification information of the second target cell.
The method of claim 16, wherein the sending, by the terminal device, the indication information to the network device of the second target cell of the plurality of target cells comprises:

and the terminal equipment sends the indication information to the network equipment of the second target cell through the resource indicated in the uplink authorization allocated to the terminal equipment by the network equipment of the second target cell.
The method of claim 19, wherein the sending, by the terminal device, the indication information to the network device of the second target cell through the resource indicated in the uplink grant that has been allocated by the network device of the second target cell to the terminal device, comprises:

if the terminal device receives an RAR message sent to the terminal device by the network device of the second target cell within a Random Access Response (RAR) window, the terminal device sends the indication information to the network device of the second target cell through the resource indicated in the uplink grant in the RAR message.
The method of claim 20, further comprising:

and if the terminal equipment does not receive the RAR message sent to the terminal equipment by the network equipment of the second target cell in a Random Access Response (RAR) window, the terminal equipment stops initiating random access to the second target cell again.
The method of claim 19, wherein the sending, by the terminal device, the indication information to the network device of the second target cell through the resource indicated in the uplink grant that has been allocated by the network device of the second target cell to the terminal device, comprises:

if the terminal device receives a contention resolution message sent by the second target cell to the terminal device before the contention resolution timer is overtime, the terminal device sends 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.
The method of claim 22, further comprising:

and if the terminal equipment does not receive the competition resolving message sent to the terminal equipment by the network equipment of the second target cell before the competition resolving timer is overtime, the terminal equipment stops initiating random access to the second target cell again.
A method of random access, comprising:

under the condition that the terminal equipment is successfully accessed to the first target cell, the network equipment receives indication information, wherein the indication information is used for indicating a second target cell to stop random access to the terminal equipment, and the network equipment is network equipment of the second target cell.
The method of 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 wherein the receiving, by the network device, the indication information includes:

and the network equipment receives the indication information sent by the network equipment of the first target cell.
The method of claim 25, wherein the indication information comprises identification information of the second target cell.
The method of claim 24, wherein the network device receives indication information, comprising:

and the network equipment receives the indication information through the resources indicated in the uplink authorization allocated to the terminal equipment.
The method of claim 27, wherein the network device receives the indication information through a resource indicated in an uplink grant allocated to the terminal device, and wherein the method comprises:

and the network equipment receives the indication information through the resource indicated in the uplink authorization in the Random Access Response (RAR) message sent to the terminal equipment.
The method of claim 27, wherein the network device receives the indication information through an uplink grant allocated to the terminal device, and wherein the method comprises:

and the network equipment receives the indication information through the resource indicated in the uplink authorization in the competition resolving message sent to the terminal equipment.
A terminal device, characterized in that the terminal device comprises:

a processing unit for determining at least one target cell capable of random access, an

And determining whether to initiate random access to the at least one target cell according to a first wireless capability, wherein the wireless capability is used for indicating the random access capability of the multi-target cell of the terminal equipment.
The terminal device of claim 30, wherein the at least one target cell includes a plurality of target cells, and in a case that 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 the random access of the multiple target cells, determining to initiate the random access to at least one target cell in the multiple target cells;

and if the first wireless capability supports the random access of multiple target cells, determining to initiate the random access to the multiple target cells.
The terminal device of claim 30, wherein, in a case that 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 the random access of the multi-target cell, determining not to initiate the random access to the at least one target cell;

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

if the random access initiated by the terminal equipment to the target cells is not successful, updating the wireless capability of the terminal equipment from the first wireless capability to a second wireless capability, wherein the second wireless capability is different from the first wireless capability;

the terminal device further includes:

and the transceiver unit is used for carrying out random access to part of the target cells in the plurality of target cells according to the second wireless capability.
The terminal device of claim 33, wherein the processing unit is further configured to:

and stopping the random access to the target cells except the part of the target cells in the plurality of target cells according to the sequence of initiating the random access to the plurality of target cells at the previous time.
The terminal device according to any of claims 30 to 32, wherein the terminal device further comprises:

a transceiver unit, configured to send indication information to a network device of a second target cell in the multiple target cells when the terminal device initiates random access to the multiple target cells and successfully accesses a first target cell in the multiple target cells, where the indication information is used to indicate the second target cell to stop random access to the terminal device.
The terminal device of claim 35, wherein the transceiver unit is specifically configured to:

and sending the indication information to the network equipment of the second target cell through a Radio Resource Control (RRC) reconfiguration complete message sent to the network equipment of the first target cell.
The terminal device of claim 36, wherein the indication information comprises identification information of the second target cell.
The terminal device of claim 35, wherein the transceiver unit is specifically configured to:

and sending the indication information to the network equipment of the second target cell through the resource indicated in the uplink grant which is allocated to the terminal equipment by the network equipment of the second target cell.
The terminal device according to claim 38, wherein the transceiver unit is specifically configured to:

and if the terminal equipment receives an RAR message sent to the terminal equipment by the network equipment of the second target cell in a Random Access Response (RAR) window, sending the indication information to the network equipment of the second target cell through the resource indicated by the uplink authorization in the RAR message.
The terminal device of claim 39, wherein the processing unit is further configured to:

and if the terminal equipment does not receive the RAR message sent to the terminal equipment by the network equipment of the second target cell in a Random Access Response (RAR) window, stopping initiating random access to the second target cell again.
The terminal device according to claim 38, wherein the transceiver unit is specifically configured to:

and if the terminal equipment receives a contention resolution message sent to the terminal equipment by the network equipment of the second target cell before the contention resolution timer is overtime, sending the indication information to the network equipment of the second target cell through the resource indicated by the uplink authorization in the contention resolution message.
The terminal device of claim 41, wherein the processing unit is further configured to:

and if the terminal equipment does not receive the competition resolving message sent to the terminal equipment by the network equipment of the second target cell before the competition resolving timer is overtime, stopping initiating random access to the second target cell again.
The terminal device according to any one of claims 30 to 42, wherein the at least one target cell includes a third target cell, and wherein the processing unit is specifically configured to:

and under the condition that the third target cell meets a first condition, determining the third target cell as a target cell capable of random access.
The terminal device of claim 43, wherein the terminal device further comprises:

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, and the candidate target cell includes the third target cell.
A terminal device, characterized in that the terminal device comprises:

a transceiving unit for initiating random access to a plurality of target cells, an

And sending indication information to network equipment of a second target cell in the target cells under the condition that the terminal equipment is successfully accessed to a first target cell in the target cells, wherein the indication information is used for indicating the second target cell to stop random access to the terminal equipment.
The terminal device according to claim 45, wherein the transceiver unit is specifically configured to:

and sending the indication information to the network equipment of the second target cell through a Radio Resource Control (RRC) reconfiguration complete message sent to the network equipment of the first target cell.
The terminal device of claim 46, wherein the indication information comprises identification information of the second target cell.
The terminal device according to claim 45, wherein the transceiver unit is specifically configured to:

and sending the indication information to the network equipment of the second target cell through the resource indicated in the uplink grant which is allocated to the terminal equipment by the network equipment of the second target cell.
The terminal device of claim 48, wherein the transceiver unit is specifically configured to:

and if the terminal equipment receives an RAR message sent to the terminal equipment by the network equipment of the second target cell in a Random Access Response (RAR) window, sending the indication information to the network equipment of the second target cell through the resource indicated in the uplink authorization in the RAR message.
The terminal device of claim 49, wherein the terminal device further comprises:

and the processing unit is configured to stop initiating random access again to the second target cell if the terminal device does not receive the RAR message sent to the terminal device by the network device of the second target cell within a Random Access Response (RAR) window.
The terminal device of claim 48, wherein the transceiver unit is specifically configured to:

and if the terminal equipment receives a contention resolution message sent by the second target cell to the terminal equipment before the contention resolution timer is overtime, sending the indication information to the network equipment of the second target cell through the resource indicated in the uplink authorization in the contention resolution message.
The terminal device of claim 51, wherein the terminal device further comprises:

and the processing unit is used for stopping initiating random access to the second target cell again if the terminal equipment does not receive the competition resolving message sent to the terminal equipment by the network equipment of the second target cell before the competition resolving timer is overtime.
A network device, characterized in that the network device comprises:

a receiving and sending unit, configured to receive indication information when a terminal device successfully accesses a first target cell, where the indication information is used to indicate a second target cell to stop random access to the terminal device, and the network device is a network device of the second target cell.
The network device of 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 is specifically configured to:

and receiving the indication information sent by the network equipment of the first target cell.
The network device of 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:

and receiving the indication information through the resources indicated in the uplink grant allocated to the terminal equipment.
The network device according to claim 56, wherein the transceiver unit is specifically configured to:

and receiving the indication information through the resource indicated in the uplink authorization in the Random Access Response (RAR) message sent to the terminal equipment.
The network device according to claim 56, wherein the transceiver unit is specifically configured to:

and receiving the indication information through the resource indicated in the uplink grant in the contention resolution message sent to the terminal equipment.
A terminal device, comprising: a processor and a memory for storing a computer program, the processor being configured to invoke and execute the computer program stored in the memory to perform the method of any of claims 1 to 15.
A terminal device, comprising: a processor and a memory for storing a computer program, the processor being configured to invoke and execute the computer program stored in the memory to perform the method of any of claims 16 to 23.
A network device, comprising: a processor and a memory for storing a computer program, the processor being configured to invoke and execute the computer program stored in the memory to perform the method of any of claims 24 to 29.
A chip, comprising: a processor for calling and running a computer program from a memory so that a device on which the chip is installed performs the method of any one of claims 1 to 15.
A chip, comprising: a processor for calling and running a computer program from a memory so that a device on which the chip is installed performs the method of any one of claims 16 to 23.
A chip, comprising: a processor for calling and running a computer program from a memory so that a device on which the chip is installed performs the method of any one of claims 24 to 29.
A computer-readable storage medium for storing a computer program which causes a computer to perform the method of any one of claims 1 to 15.
A computer-readable storage medium for storing a computer program which causes a computer to perform the method of any one of claims 16 to 23.
A computer-readable storage medium for storing a computer program which causes a computer to perform the method of any one of claims 24 to 29.
A computer program product comprising computer program instructions for causing a computer to perform the method of any one of claims 1 to 15.
A computer program product comprising computer program instructions for causing a computer to perform the method of any one of claims 16 to 23.
A computer program product comprising computer program instructions to cause a computer to perform the method of any of claims 24 to 29.
A computer program, characterized in that the computer program causes a computer to perform the method according to any of claims 1-15.
A computer program, characterized in that the computer program causes a computer to perform the method according to any of claims 16 to 23.
A computer program, characterized in that the computer program causes a computer to perform the method according to any of claims 24-29.