CN111225453A

CN111225453A - Communication method and device

Info

Publication number: CN111225453A
Application number: CN201811429033.2A
Authority: CN
Inventors: 严乐; 耿婷婷; 曾清海
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-11-27
Filing date: 2018-11-27
Publication date: 2020-06-02
Anticipated expiration: 2038-11-27
Also published as: WO2020108220A1; CN111225453B

Abstract

The embodiment of the application discloses a communication method and device, and relates to the technical field of communication. The time delay of the RRC reestablishment process can be reduced, and communication interruption caused by radio link failure or switching failure is avoided. The method can comprise the following steps: the terminal equipment receives a first message, wherein the first message comprises candidate reestablishment cell list information, and the candidate reestablishment cell list information comprises information of one or more candidate reestablishment cells; and the terminal equipment determines a target cell for RRC reestablishment according to the candidate reestablishment cell list information.

Description

Communication method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communication method and apparatus.

Background

In the process that a User Equipment (UE) in a connected state maintains a Radio Resource Control (RRC) connection with a serving cell, the UE may initiate an RRC reestablishment procedure under some conditions, such as radio link failure, handover failure, integrity protection check failure, reconfiguration failure, and the like. When the UE initiates RRC reestablishment, there may be a time delay, so that the UE cannot recover the connection with the network side as soon as possible, and thus cannot recover the communication transmission with the network side as soon as possible. Therefore, how to reduce the time delay in the RRC reestablishment process and speed up the recovery of the connection between the UE and the network side is a problem to be solved.

Disclosure of Invention

The embodiment of the application provides a communication method, device and system, which can reduce the time delay of an RRC reestablishment process, accelerate the recovery of the connection between terminal equipment and a network side, and avoid communication interruption caused by radio link failure or handover failure.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

in a first aspect, the present application provides a communication method and apparatus.

In one possible design, the method may include: and the terminal equipment receives the first message and determines a target cell for Radio Resource Control (RRC) reestablishment according to the candidate reestablishment cell list information. Wherein the first message includes candidate re-establishment cell list information, the candidate re-establishment cell list information including information of one or more candidate re-establishment cells. In the method, the terminal equipment determines the target cell for RRC reestablishment according to the candidate reestablishment cell configured at the network side, so that the time delay of the RRC reestablishment process can be reduced, and the recovery of the connection between the terminal equipment and the network side is accelerated.

In one possible design, a terminal device reports a measurement report, which includes a cell identifier and a cell signal quality of at least one neighboring cell; the candidate re-establishment cell is one or more of at least one neighbor cell included in the measurement report. In the method, the candidate reestablished cells determined by the network equipment are reported in the measurement report by the UE.

In one possible design, the candidate reestablishing cells have priorities, and the terminal device selects one of the one or more candidate reestablishing cells as the target cell in order from the highest priority to the lowest priority based on the priorities of the one or more candidate reestablishing cells. Therefore, the terminal equipment can select the cell with high priority to perform RRC reestablishment, the success rate of RRC reestablishment is improved, the times of trying to perform RRC reestablishment are reduced, and the time delay is reduced.

In one possible design, the candidate re-establishment cell list information includes priority indication information of one or more candidate re-establishment cells, and the terminal device selects one of the one or more candidate re-establishment cells as the target cell in order of priority from high to low according to the priority indication information of the one or more candidate re-establishment cells.

In one possible design, the target cell is a cell that satisfies the S criteria for cell selection.

Wherein the S criteria for cell selection include: if the parameters of the cell satisfy S_rxlev>0 and S_qual>0, the cell meets the camping requirement. Wherein S is_rxlevSelecting a received power, S, for a cell_rxlevCorrelating with at least one of a measured reference signal received power of the cell, a minimum required reference signal received power of the cell, an offset value, or a power offset value; s_qualSelecting a reception quality, S, for a cell_qualWith respect to at least one of a measured reference signal received quality of the cell, a minimum required reference signal received quality of the cell, or an offset value.

Correspondingly, the application also provides a communication device, and the device can realize the communication method of the first aspect. For example, the apparatus may be a terminal or a chip applied in the terminal, and may also be other apparatuses capable of implementing the communication method, and the method may be implemented by software, hardware, or by executing corresponding software through hardware.

In one possible design, the apparatus may include a processor and a memory. The processor is configured to enable the apparatus to perform the corresponding functions in the method of the first aspect. The memory is for coupling to the processor and holds the necessary program instructions and data for the device. In addition, the device can also comprise a communication interface for supporting the communication between the device and other devices. The communication interface may be a transceiver or a transceiver circuit.

In one possible design, the apparatus may include: a receiving unit and a processing unit. The receiving unit is configured to receive a first message, where the first message includes candidate reestablishment cell list information, and the candidate reestablishment cell list information includes information of one or more candidate reestablishment cells; and the processing unit is used for determining a target cell for Radio Resource Control (RRC) reestablishment according to the candidate reestablishment cell list information.

In one possible design, the apparatus further includes a transmitting unit. A sending unit, configured to report a measurement report, where the measurement report includes a cell identifier of at least one neighboring cell and a cell signal quality; the candidate re-establishment cell is one or more of at least one neighbor cell included in the measurement report.

In one possible design, the candidate re-establishment cells have priorities, and the processing unit is specifically configured to select one of the one or more candidate re-establishment cells as the target cell according to priorities of the one or more candidate re-establishment cells in an order from high to low.

In a possible design, the candidate re-establishment cell list information includes priority indication information of one or more candidate re-establishment cells, and the processing unit is specifically configured to select, according to the priority indication information of the one or more candidate re-establishment cells, one of the one or more candidate re-establishment cells as the target cell in an order from high priority to low priority.

In a second aspect, the present application provides a communication method and apparatus.

In one possible design, the method may include: the method comprises the steps that first network equipment generates a first message, and the first network equipment sends the first message to terminal equipment; the first message comprises candidate reestablishment cell list information, the candidate reestablishment cell list information is used for determining a target cell for Radio Resource Control (RRC) reestablishment, and the candidate reestablishment cell list information comprises information of one or more candidate reestablishment cells. In the method, the first network device sends the list information of the candidate reestablished cells to the terminal device, and the terminal device can determine the target cell for RRC reestablishment according to the list information of the candidate reestablished cells, so that the time delay of the RRC reestablishment process can be reduced, and the recovery of the connection between the terminal device and the network side is accelerated.

In one possible design, before the first network device sends the first message to the terminal device, the method further includes: the method comprises the steps that a first network device receives cell selection parameters from at least one second network device, and the second network device is a network device to which a neighboring cell of a service cell of a terminal device belongs; the first network equipment receives a measurement report from the terminal equipment, wherein the measurement report comprises a cell identifier of at least one adjacent cell and corresponding cell signal quality; and the first network equipment determines candidate reestablishment cell list information according to the cell signal quality and the cell selection parameters of the adjacent cells corresponding to the cell signal quality. In the method, a first network device determines candidate re-establishment cell list information.

In one possible design, the first network device sends context information of the terminal device to each of the second network devices to which one or more candidate reestablishing cells belong. Therefore, the network device to which each candidate reestablishing cell belongs acquires the context information of the terminal device, and when the terminal device and the determined target cell perform RRC reestablishment, the network device to which the target cell belongs does not need to acquire the context information of the terminal device from the serving base station in the RRC reestablishment process, so that the time delay of the RRC reestablishment process can be reduced.

In one possible design, before a first network device sends a first message to a terminal device, the first network device receives reestablished cell list information of a third network device from at least one third network device, respectively, where each reestablished cell list information includes information of one or more candidate reestablished cells in the corresponding third network device; the first network device determines candidate reestablishment cell list information according to reestablishment cell list information of at least one third network device. In the method, the candidate re-establishment cell is determined by the third network device, and the first network device determines candidate re-establishment cell list information according to re-establishment cell list information received from the third network device.

In one possible design, the first network device receives a measurement report from the terminal device, where the measurement report includes a cell identifier of at least one neighboring cell and a corresponding cell signal quality; the first network equipment sends corresponding cell signal quality to fourth network equipment according to the measurement report, wherein the fourth network equipment is corresponding to at least one adjacent cell and comprises one or more network equipment; wherein the third network device is one or more of the fourth network devices. In the method, the candidate re-established cell determined by the third network device is reported in the measurement report by the terminal device.

In one possible design, the first network device sends context information of the terminal device to the fourth network device. Therefore, the network device to which each candidate reestablishing cell belongs acquires the context information of the terminal device, and when the terminal device and the determined target cell perform RRC reestablishment, the network device to which the target cell belongs does not need to acquire the context information of the terminal device from the serving base station in the RRC reestablishment process, so that the time delay of the RRC reestablishment process can be reduced.

In one possible design, the candidate re-establishment cells are prioritized. Therefore, the terminal equipment can select the cell with high priority to perform RRC reestablishment, the success rate of RRC reestablishment is improved, the times of trying to perform RRC reestablishment are reduced, and the time delay is reduced.

In one possible design, the candidate re-establishment cell list information includes priority indication information of one or more candidate re-establishment cells, and the priority indication information is used for indicating the priority of the cell as a target cell for RRC re-establishment.

In one possible design, the candidate re-established cells are cells that satisfy the S criteria for cell selection.

Correspondingly, the application also provides a communication device, and the device can realize the communication method of the second aspect. For example, the apparatus may be a network device or a chip applied in a network device, and may also be other apparatuses capable of implementing the communication method, where the method may be implemented by software, hardware, or by executing corresponding software through hardware.

In one possible design, the apparatus may include a processor and a memory. The processor is configured to enable the apparatus to perform the corresponding functions of the method of the second aspect. The memory is for coupling to the processor and holds the necessary program instructions and data for the device. In addition, the device can also comprise a communication interface for supporting the communication between the device and other devices. The communication interface may be a transceiver or a transceiver circuit.

In one possible design, the apparatus may include: a processing unit and a transmitting unit. The processing unit is configured to generate a first message, where the first message includes candidate reestablishment cell list information, the candidate reestablishment cell list information is used to determine a target cell for RRC reestablishment, and the candidate reestablishment cell list information includes information of one or more candidate reestablishment cells; a sending unit, configured to send a first message.

In a possible design, the apparatus further includes a receiving unit, configured to receive the cell selection parameter from at least one second network device, where the second network device is a network device to which a neighboring cell of a serving cell of the terminal device belongs; the receiving unit is further used for receiving a measurement report from the terminal equipment, wherein the measurement report comprises the cell identification of at least one adjacent cell and the corresponding cell signal quality; and the processing unit is further used for determining candidate reestablishment cell list information according to the cell signal quality and the cell selection parameter of the adjacent cell corresponding to the cell signal quality.

In a possible design, the sending unit is further configured to send context information of the terminal device to each of second network devices to which one or more candidate reestablishing cells respectively belong.

In one possible design, the receiving unit is configured to receive reestablished cell list information of the third network device from at least one third network device, respectively, where each reestablished cell list information includes information of one or more candidate reestablished cells in the corresponding third network device; a processing unit, configured to determine candidate reestablishment cell list information according to reestablishment cell list information of at least one third network device.

In one possible design, a receiving unit is configured to receive a measurement report from a terminal device, where the measurement report includes a cell identifier of at least one neighboring cell and a corresponding cell signal quality; a sending unit, configured to send, according to the measurement report, the corresponding cell signal quality to a fourth network device, where the fourth network device is a network device corresponding to at least one neighboring cell, and the fourth network device includes one or more network devices; wherein the third network device is one or more of the fourth network devices.

In one possible design, the sending unit is further configured to send context information of the terminal device to a fourth network device.

In a third aspect, the present application provides a communication method and apparatus.

In one possible design, the method may include: the network equipment generates a second message, wherein the second message comprises a cell selection parameter, the cell selection parameter is used for the first network equipment to determine candidate reestablishment cell list information, and the candidate reestablishment cell list information comprises information of one or more candidate reestablishment cells; the network device sends a second message to the first network device. In the method, the network device sends a parameter for determining the candidate reestablishing cell to the first network device, so that the first network device can send the determined candidate reestablishing cell list information to the terminal device.

Correspondingly, the application also provides a communication device, and the device can implement the communication method of the third aspect. For example, the apparatus may be a network device or a chip applied in a network device, and may also be other apparatuses capable of implementing the communication method, where the method may be implemented by software, hardware, or by executing corresponding software through hardware.

In one possible design, the apparatus may include a processor and a memory. The processor is configured to enable the apparatus to perform the corresponding functions of the method of the third aspect. The memory is for coupling to the processor and holds the necessary program instructions and data for the device. In addition, the device can also comprise a communication interface for supporting the communication between the device and other devices. The communication interface may be a transceiver or a transceiver circuit.

In one possible design, the apparatus may include: a processing unit and a transmitting unit. The processing unit is configured to generate a second message, where the second message includes a cell selection parameter, the cell selection parameter is used for the first network device to determine candidate reestablishment cell list information, and the candidate reestablishment cell list information includes information of one or more candidate reestablishment cells; and the sending unit is used for sending the second message to the first network equipment.

In one possible design, the candidate re-establishment cells are prioritized.

In a fourth aspect, the present application provides a communication method and apparatus.

In one possible design, the method may include: the network equipment receives a cell identification of at least one adjacent cell and corresponding cell signal quality from first network equipment; the network equipment determines reestablishment cell list information according to the cell signal quality of at least one adjacent cell and the corresponding cell selection parameter of each adjacent cell, wherein the reestablishment cell list information comprises information of one or more candidate reestablishment cells; the network equipment sends reestablishment cell list information to the first network equipment, and the reestablishment cell list information is used for determining a target cell for Radio Resource Control (RRC) reestablishment. In the method, the network equipment sends the determined candidate reestablishing cells to the first network equipment, so that the first network equipment can determine candidate reestablishing cell list information according to the candidate reestablishing cells of each network equipment and send the candidate reestablishing cell list information to the terminal equipment.

Correspondingly, the present application also provides a communication device, which can implement the communication method described in the fourth aspect. For example, the apparatus may be a network device or a chip applied in a network device, and may also be other apparatuses capable of implementing the communication method, where the method may be implemented by software, hardware, or by executing corresponding software through hardware.

In one possible design, the apparatus may include a processor and a memory. The processor is configured to enable the apparatus to perform the corresponding functions of the method of the fourth aspect. The memory is for coupling to the processor and holds the necessary program instructions and data for the device. In addition, the device can also comprise a communication interface for supporting the communication between the device and other devices. The communication interface may be a transceiver or a transceiver circuit.

In one possible design, the apparatus may include: the device comprises a receiving unit, a processing unit and a sending unit. The receiving unit is used for receiving a cell identifier of at least one neighboring cell and corresponding cell signal quality from a first network device; the processing unit is used for determining reestablishment cell list information according to the cell signal quality of at least one adjacent cell and the corresponding cell selection parameter of each adjacent cell, and the reestablishment cell list information comprises information of one or more candidate reestablishment cells; a sending unit, configured to send reestablished cell list information to the first network device, where the reestablished cell list information is used to determine a target cell for RRC reestablishment.

In a fifth aspect, the present application provides a communication method and apparatus.

In one possible design, the method may include: under the condition that radio link failure or switching failure occurs, the terminal equipment detects the signal quality of a cell; the terminal equipment determines a target cell for Radio Resource Control (RRC) reestablishment according to the detected cell signal quality and the measurement report; the measurement report comprises the cell identification and the cell signal quality of at least one adjacent cell of the service cell of the terminal equipment; and the terminal equipment initiates RRC reestablishment to the target cell. In the method, the terminal equipment determines the target cell reestablished by the RRC according to the measurement report and the cell signal quality detected by the terminal equipment, so that the time delay of the RRC reestablishment process can be reduced, the recovery of the connection between the terminal equipment and the network side is accelerated, and the communication interruption caused by the radio link failure or the switching failure is avoided.

In one possible design, the terminal device receives first indication information from the network device, where the first indication information is used to instruct the terminal device to determine a target cell for RRC re-establishment.

Correspondingly, the application also provides a communication device, and the device can realize the communication method of the fifth aspect. For example, the apparatus may be a terminal device or a chip applied in the terminal device, and may also be other apparatuses capable of implementing the communication method, and the method may be implemented by software, hardware, or by executing corresponding software through hardware.

In one possible design, the apparatus may include a processor and a memory. The processor is configured to enable the apparatus to perform the corresponding functions of the method of the fifth aspect. The memory is for coupling to the processor and holds the necessary program instructions and data for the device. In addition, the device can also comprise a communication interface for supporting the communication between the device and other devices. The communication interface may be a transceiver or a transceiver circuit.

In one possible design, the apparatus may include: a processing unit and a transmitting unit. The processing unit is used for detecting the signal quality of a cell under the condition of radio link failure or switching failure; the processing unit is further configured to determine a target cell for performing radio resource control RRC reestablishment according to the detected cell signal quality and a measurement report, where the measurement report includes a cell identifier and cell signal quality of at least one neighboring cell; and the sending unit is used for initiating RRC reestablishment to the target cell.

In one possible design, the apparatus further includes a receiving unit. A receiving unit, configured to receive first indication information from a network device, where the first indication information is used to indicate a terminal device to determine a target cell for RRC re-establishment.

In a sixth aspect, the present application provides a communication method and apparatus.

In one possible design, the method may include: the method comprises the steps that a first network device receives a measurement report from a terminal device, wherein the measurement report comprises a cell identification of at least one adjacent cell and corresponding cell signal quality; the first network equipment sends the context information of the terminal equipment to the network equipment which each adjacent cell contained in at least one adjacent cell belongs to. In the method, because the network equipment to which the cell in the measurement report belongs obtains the context information of the terminal equipment in advance, when the terminal equipment performs RRC reestablishment with the target cell determined according to the detected cell signal quality and the measurement report, the network equipment to which the target cell belongs does not need to obtain the context information of the terminal equipment from the serving base station in the RRC reestablishment process, thereby reducing the time delay of the RRC reestablishment process and accelerating the recovery of the connection between the terminal equipment and the network side.

Correspondingly, the present application also provides a communication device, which can implement the communication method according to the sixth aspect. For example, the apparatus may be a network device or a chip applied in a network device, and may also be other apparatuses capable of implementing the communication method, where the method may be implemented by software, hardware, or by executing corresponding software through hardware.

In one possible design, the apparatus may include: a receiving unit and a transmitting unit. The receiving unit is configured to receive a measurement report from a terminal device, where the measurement report includes a cell identifier of at least one neighboring cell and a corresponding cell signal quality; and the sending unit is used for respectively sending the context information of the terminal equipment to the network equipment which each adjacent cell contained in the at least one adjacent cell belongs to.

The present application also provides a computer-readable storage medium having stored therein instructions, which when run on a computer, cause the computer to perform the method of any of the above aspects.

The present application also provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any of the above aspects.

The present application further provides a chip system, which includes a processor and a memory, and is configured to implement the method according to any one of the above aspects.

The present application provides a communication system comprising the above-mentioned means for implementing the method of the first aspect, and the above-mentioned means for implementing the method of the second aspect, the third aspect, or the fourth aspect; alternatively, the apparatus for implementing the method of the fifth aspect and the apparatus for implementing the method of the sixth aspect are included.

Any one of the above-provided apparatuses, computer storage media, computer program products, chip systems, or communication systems is configured to execute the above-provided corresponding methods, and therefore, the beneficial effects that can be achieved by the apparatuses, the computer storage media, the computer program products, the chip systems, or the communication systems can refer to the beneficial effects of the corresponding schemes in the above-provided corresponding methods, and are not described herein again.

Drawings

Fig. 1 is a first schematic diagram of a system architecture to which the technical solution provided by the embodiment of the present application is applied;

fig. 2 is a second schematic diagram of a system architecture to which the technical solution provided by the embodiment of the present application is applied;

fig. 3 is a third schematic diagram of a system architecture to which the technical solution provided by the embodiment of the present application is applied;

fig. 4 is a first schematic diagram of a communication method according to an embodiment of the present application;

fig. 4-1 is a schematic diagram of a communication method according to an embodiment of the present application;

fig. 4-2 is a third schematic diagram of a communication method according to an embodiment of the present disclosure;

fig. 5 is a schematic diagram of another communication method provided in the embodiments of the present application;

fig. 6 is a first schematic structural diagram of a communication device according to an embodiment of the present disclosure;

fig. 7 is a second schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 8 is a third schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 9 is a fourth schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 11 is a sixth schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 12 is a seventh schematic structural diagram of a communication device according to an embodiment of the present application.

Detailed Description

The following describes in detail a communication method, an apparatus, and a system provided in an embodiment of the present application with reference to the drawings.

The technical scheme provided by the application can be applied to various communication systems, such as the current 3G and 4G communication systems, and future evolution networks, such as a 5G communication system. For example, Wideband Code Division Multiple Access (WCDMA) systems, time division-synchronous code division multiple access (TD-SCDMA) systems, Long Term Evolution (LTE) systems, LTE Advanced (LTE-a) systems, New Radio (NR) systems, other third generation partnership project (3 GPP) related cellular systems, multiple communication convergence systems, and the like, as well as other such communication systems. A variety of application scenarios may be included, which may include scenarios such as machine-to-machine (M2M), D2M, macro-micro communication, enhanced mobile internet (eMBB), ultra high reliability and low latency communication (URLLC), and massive internet of things communication (mtc), and these scenarios may include but are not limited to: a communication scenario between the terminal device and the terminal device, a communication scenario between the network device and the network device, a communication scenario between the network device and the terminal device, and the like.

The technical solution provided in the embodiment of the present application may be applied to a system architecture as shown in fig. 1, where the system architecture may include an access network 100 and a terminal device 200, where the access network 100 includes a plurality of network devices (e.g., a network device 101, a network device 102, a network device 103, and a network device 104). Illustratively, network device 101 includes cell 1 and cell 2; network device 102 includes cell 3 and cell 4; network device 103 includes cell 5, cell 6, and cell 7; network device 104 includes cell 8, cell 9, and cell 10.

The network device may be a device that is capable of communicating with the terminal device. The network device may be an NB (NodeB) in Wideband Code Division Multiple Access (WCDMA), an eNB or eNodeB (evolved NodeB) in Long Term Evolution (LTE), or a node in a 5G mobile communication system, where the 5G node may be: an access node, a next generation base station (gNB), a Transmission Receive Point (TRP), a Transmission Point (TP), or some other access node. The network device may also be a wireless controller in a Cloud Radio Access Network (CRAN) scenario, a network device or a relay station or an access point in a PLMN network for future evolution, or a wearable device or a vehicle-mounted device. Specifically, the network device corresponds to a service coverage area, and a terminal device entering the service coverage area can communicate with the network device through a wireless signal to receive a wireless access service provided by the network device. Network device 101, network device 102, network device 103, and network device 104 may be the same type of network device, such as network device 101, network device 102, network device 103, and network device 104 are all gnbs; network device 101, network device 102, network device 103, and network device 104 may also be different types of network devices, such as network device 101, network device 102, and network device 103 being a gNB and network device 104 being an eNB, or such as network device 101 and network device 102 being a gNB and network device 103 and network device 104 being a ng-eNB; this is not limited in this application.

The terminal device may be an access terminal, a User Equipment (UE) unit, a UE station, a mobile station, a remote terminal, a mobile device, a UE terminal, a wireless communication device, a UE agent, a UE apparatus, a virtual reality terminal device, an augmented reality terminal device, or a wireless terminal in industrial control, etc. An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device having wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle mounted device, a wearable device, a terminal in a 5G network or a terminal in a future evolved PLMN network, etc.

The network devices can establish connection, and can communicate with each other through an Xn interface or an X2 interface; the terminal device may be connected to network device 101, network device 102, network device 103, or network device 104 through the Uu port.

It should be noted that the system architecture shown in fig. 1 is only for example and is not used to limit the technical solution of the present application. It should be understood by those skilled in the art that in the specific implementation process, other devices, such as a core network device, may also be included in the system architecture, and the number of network devices and terminal devices may also be configured according to specific needs.

The communication method and the communication device provided by the embodiment of the application can be applied to terminal equipment, and the terminal equipment comprises a hardware layer, an operating system layer running on the hardware layer and an application layer running on the operating system layer. The hardware layer includes hardware such as a Central Processing Unit (CPU), a Memory Management Unit (MMU), and a memory (also referred to as a main memory). The operating system may be any one or more computer operating systems that implement business processing through processes (processes), such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. The application layer comprises applications such as a browser, an address list, word processing software, instant messaging software and the like. In the embodiment of the present application, a specific structure of an execution main body of a communication method is not particularly limited in the embodiment of the present application, as long as the communication method according to the embodiment of the present application can perform communication by running a program recorded with a code of the communication method according to the embodiment of the present application, for example, the execution main body of the communication method provided in the embodiment of the present application may be a terminal device, or a functional unit capable of calling the program and executing the program in the terminal device, or a communication device applied to the terminal device, such as a chip, and the present application is not limited thereto.

In one example, the protocol stack architecture and functions of a network device (e.g., a base station) are divided into two parts, one part is called a Central Unit (CU), and the other part is called a Distributed Unit (DU), and the actual deployment modes of the CU and the DU are flexible, for example, the CU parts of a plurality of base stations are integrated together to form a large-scale functional entity. Fig. 2 is a schematic diagram of a network architecture according to an embodiment of the present application. As shown in fig. 2, the network architecture includes an access network (RAN, for example) device and a terminal device. The RAN device includes a baseband device and a radio frequency device, where the baseband device may be implemented by one node or by multiple nodes, and the radio frequency device may be implemented independently by being pulled away from the baseband device, may also be integrated in the baseband device, or may be partially pulled away and partially integrated in the baseband device. For example, in an LTE communication system, a RAN device (e.g., eNB) includes a baseband device and a radio frequency device, where the radio frequency device may be arranged in a remote manner with respect to the baseband device (e.g., a Radio Remote Unit (RRU) with respect to a baseband processing unit (BBU)), and the RAN device is implemented by a node for implementing functions of protocol layers such as Radio Resource Control (RRC), packet data convergence layer protocol (PDCP), Radio Link Control (RLC), and Media Access Control (MAC). As another example, in an evolved structure, a baseband device may include CUs and DUs, and a plurality of DUs may be centrally controlled by one CU. As shown in fig. 2, the CU and the DU may be divided according to protocol layers of the wireless network, for example, functions of a packet data convergence layer protocol layer and above protocol layers are provided in the CU, and functions of protocol layers below the PDCP, for example, functions of an RLC and MAC layer, are provided in the DU.

This division of the protocol layers is only an example, and it is also possible to divide the protocol layers at other protocol layers, for example, at the RLC layer, and the functions of the RLC layer and the protocol layers above are set in the CU, and the functions of the protocol layers below the RLC layer are set in the DU; alternatively, the functions are divided into some protocol layers, for example, a part of the functions of the RLC layer and the functions of the protocol layers above the RLC layer are provided in the CU, and the remaining functions of the RLC layer and the functions of the protocol layers below the RLC layer are provided in the DU. In addition, the processing time may be divided in other manners, for example, by time delay, a function that needs to satisfy the time delay requirement for processing is provided in the DU, and a function that does not need to satisfy the time delay requirement is provided in the CU.

In addition, the radio frequency device may be pulled away, not placed in the DU, or integrated in the DU, or partially pulled away and partially integrated in the DU, which is not limited herein.

In addition, with continuing reference to fig. 3, with respect to the architecture shown in fig. 2, the Control Plane (CP) and the User Plane (UP) of the CU may be separated and implemented by being divided into different entities, i.e. a control plane CU entity (CU-CP entity) and a user plane CU entity (CU-UP entity), respectively.

In the above network architecture, the signaling/data generated by the CU may be transmitted to the terminal device through the DU, or the signaling/data generated by the terminal device may be transmitted to the CU through the DU. The DU may pass through the end device or CU directly through protocol layer encapsulation without parsing the signaling/data. In the following embodiments, if transmission of such signaling/data between the DU and the terminal device is involved, the transmission or reception of the signaling/data by the DU includes such a scenario. For example, the signaling of the RRC or PDCP layer is finally processed into the signaling/data of the physical layer (PHY) to be transmitted to the terminal device, or converted from the received signaling/data of the PHY layer. Under this architecture, the signaling/data of the RRC or PDCP layer can also be considered to be transmitted by the DU, or by the DU and the radio frequency.

In the above embodiment, the CU is divided into network devices in the RAN, and furthermore, the CU may also be divided into network devices in the core network, which is not limited herein. The network architectures shown in fig. 2 and 3 may be applied to a 5G communication system, which may also share one or more components or resources with the LTE system.

The apparatus in the following embodiments of the present application may be located in a terminal device or an access network device according to the implemented functions. When the above structure of CU-DU is adopted, the access network device may be a CU node, or a DU node, or a RAN device including the functions of the CU node and the DU node. For example, network device 101, network device 102, network device 103, and network device 104 in fig. 1 may be one CU node or one DU node in fig. 2 or fig. 3, respectively, or RAN devices including the functions of the CU node and the DU node.

In this application, the communication method may be executed by a network device and a terminal device, or may be an apparatus applied to the network device and the terminal device, for example, a chip, or other apparatuses for implementing the communication method. The network device and the terminal device are described as examples to perform the above communication method.

The following explains some of the terms referred to in this application:

1. s criteria for cell selection

The S criteria for cell selection include, if the parameters of the cell satisfy S_rxlev>0 and S_qual>0, the cell meets the camping requirement. Wherein S is_rxlevSelecting a received power, S, for a cell_qualThe reception quality is selected for the cell and,

S_rxlev＝Q_rxlevmeas–(Q_rxlevmin+Q_{rxlevminoffset})–P_compensation–Qoffset_temp；

S_qual＝Q_qualmeas–(Q_qualmin+Q_{qualminoffset})–Qoffset_temp；

Q_rxlevmeasa reference signal received power for the measured cell; q_rxlevminFor the minimum required reference signal received power of a cell, if the terminal device supports a Supplemental Uplink (SUL) frequency point of the cell, Q may be obtained according to an RxLevMinSUL included in a system message delivered by the network device_rxlevminOtherwise, Q can be obtained according to Q-RxLevMin included in the system message sent by the network equipment_rxlevmin；Q_{rxlevminoffset}Relative to Q_rxlevminThe offset value of (a); q_qualmeasA reference signal received quality for the measured cell; q_qualminA minimum required reference signal received quality for the cell; q_{qualminoffset}Relative to Q_qualminThe offset value of (a); p_compensationIs a power compensation value; qoffset_tempIs a temporary offset value.

In addition, the above-mentioned S_rxlevAnd S_qualThe calculation formula may have other forms, for example, the parameters in the formula may have different names or the parameters may be added or deleted in the formula.

2. The term "plurality" herein means two or more. The terms "first" and "second" herein are used to distinguish between different objects, and are not used to describe a particular order of objects. For example, the first network device and the second network device are only used for distinguishing different network devices, and the sequence order thereof is not limited. 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 the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

The UE may initiate an RRC reestablishment procedure when a radio link fails (for example, after an upper layer of the UE receives indication information sent by a physical layer and used for detecting a radio link problem, a timer is started, and the radio link is not recovered after the timer expires, or a random access procedure fails, or an RLC fails, for example, the number of retransmissions of the RLC layer reaches a maximum value and data is not successfully transmitted) or a handover failure (for example, a handover message sent by the network device fails to be sent and the UE fails to successfully receive the handover message), or the UE successfully receives the handover message (for example, the handover message includes a cell identifier of a target cell, a parameter required for accessing the target cell, and the like), but fails to be successfully handed over to the target cell, for example, the UE fails to perform the random access procedure with the target cell within a certain time). In one possible implementation, the UE performs cell selection, and selects a suitable cell satisfying the S criterion for RRC re-establishment. When the UE initiates the RRC reestablishment request in the cell, if the base station to which the cell belongs does not have the context information of the UE, the base station needs to initiate a procedure of acquiring the context of the UE to the base station (serving base station) to which the serving cell of the UE belongs to acquire the context information of the UE, thereby causing a time delay, so that the UE cannot recover the connection with the network side as soon as possible.

The embodiment of the present application provides a communication method, which may be applied to the communication systems shown in fig. 1 to fig. 3, where a first network device provides a candidate reestablishing cell list for a terminal device, the first network device provides context information of a UE for a network device to which one or more candidate reestablishing cells in the candidate reestablishing cell list belong, and the terminal device selects a cell from the one or more candidate reestablishing cells provided by the first network device to perform RRC reestablishment, so as to reduce a time delay in an RRC reestablishment process, accelerate recovery of an RRC connection, and avoid communication interruption caused by a radio link failure or a handover failure. As shown in fig. 4, the method may include S101-S104:

s101, the first network equipment generates a first message.

Illustratively, the terminal device is the terminal device 200 in fig. 1, the terminal device 200 maintains an RRC connection with the network device 101 in fig. 1, and the first network device is the network device 101. The first network device is a network device to which a serving cell of the terminal device belongs.

The first network equipment generates a first message; the first message comprises candidate reestablishment cell list information, and the candidate reestablishment cell list information is used for the terminal equipment to determine a target cell for RRC reestablishment; wherein the candidate re-establishment cell list information comprises information of one or more candidate re-establishment cells. The terminal device may select one of the one or more candidate re-establishment cells as a target cell for RRC re-establishment.

For example, the first network device may determine candidate re-establishment cell list information to generate the first message. The specific determination method may include:

mode one, as shown in fig. 4-1, the mode may include:

s10111, the second network device generates a second message.

The second network device is a network device to which a neighbor cell of a serving cell of the terminal device belongs. It is understood that the second network device is a network device other than the first network device, and the number of the second network devices may be one or more, and each of the second network devices may generate the second message. Accordingly, the one or more second network devices generate one or more second messages, respectively.

Illustratively, the serving cell of terminal device 200 in fig. 1 is cell 1 of network device 101, and the neighboring cells of cell 1 include cell 4, cell 5, cell 6, cell 7, and cell 8. Cell 4 belongs to network device 102, cells 5, 6 and 7 belong to network device 103, and cell 8 belongs to network device 104; the second network device includes network device 102, network device 103, and network device 104. Network device 102, network device 103, and network device 104 each generate a second message.

The second message generated by each second network device includes cell selection parameters corresponding to the second network device, and the cell selection parameters are used for the first network device to determine candidate reestablishment cell list information. Illustratively, the cell selection parameter corresponding to the cell belonging to the second network device includes at least one of the following parameters: q_rxlevmin、Q_qualmin、Q_{rxlevminoffset}、Q_{qualminoffset}、P_compensationAnd Qoffset_temp. The cell selection parameter may be of a cell granularity, that is, the cell selection parameters corresponding to different cells belonging to the same second network device may be the same or different, and this embodiment is not limited in this embodiment. And the second network equipment generates a second message according to the neighboring cell relation and the configured cell selection parameter. Illustratively, cell 4 belonging to network device 102 is a neighbor cell of a serving cell of terminal device 200 (i.e. cell 1 belonging to network device 101), and the second message generated by network device 102 includes at least one of the following parameters of corresponding cell 4: q_rxlevmin、Q_qualmin、Q_{rxlevminoffset}、Q_{qualminoffset}、P_compensationAnd Qoffset_temp(ii) a Cell 5, cell 6, and cell 7 belonging to network device 103 are neighbors of cell 1 belonging to network device 101, and the second message generated by network device 103 includes at least one of the following parameters for the corresponding cell 5, cell 6, and cell 7: q_rxlevmin、Q_qualmin、Q_{rxlevminoffset}、Q_{qualminoffset}、P_compensationAnd Qoffset_tempAnd the value of the same parameter in the at least one parameter corresponding to the cell 5, the cell 6 and the cell 7 may be the same or different. The cell 8 belonging to the network device 104 is a neighboring cell of the serving cell (i.e. cell 1), the cell 9 of the network device 104 is a neighboring cell of the cell 2 belonging to the network device 101, and the second message generated by the network device 104 includes at least one of the following parameters respectively corresponding to the cell 8 and the cell 9: q_rxlevmin、Q_qualmin、Q_{rxlevminoffset}、Q_{qualminoffset}、P_compensationAnd Qoffset_temp。

For example, the second message may be an Xn setup request (Xn setup request) message or an Xn setup response (Xn setup response) message in the Xn setup procedure, or a new generation radio access network node configuration update (NG-RAN node configuration update) message or a new generation radio access network node configuration update acknowledge (NG-RAN node configuration update) message in the new generation radio access network node configuration update procedure. Of course, the second message may also be other new or existing messages, which is not limited in this embodiment of the application.

S10112, the second network device sends the second message to the first network device.

Each second network device sends a second message to the first network device. Each second message comprises corresponding cell selection parameters, the cell corresponding to the cell selection parameters belongs to the second network equipment, and the coverage area of the second network equipment and the coverage area of the first network equipment have an overlapping area.

S10113, the first network device receives the second message.

And S10114, the terminal equipment reports the measurement report.

The terminal device performs Radio Resource Management (RRM) measurement according to the measurement configuration information issued by the first network device, and when a trigger condition of a measurement event is satisfied, the terminal device reports a measurement report to the first network device.

For example, in fig. 1, the terminal device 200 performs RRM measurement according to measurement information configured by the network device 101 (i.e., the first network device) where the serving cell (cell 1) is located, and when a reporting condition of the measurement report is satisfied, the terminal device 200 reports the measurement report to the network device 101.

The measurement report reported by the terminal equipment comprises the cell identification and the cell signal quality of at least one adjacent cell, and the at least one adjacent cell meets the reporting trigger condition of the measurement report. In addition, the cell identity of the serving cell and the cell signal quality of the serving cell may also be included in the measurement report.

Illustratively, the serving cell of the terminal apparatus 200 is cell 1. The measurement report reported by the terminal device includes measurement information of the cell 4, the cell 5, the cell 6, and the cell 8, for example, a cell identifier and a cell signal quality of the cell 4, a cell identifier and a cell signal quality of the cell 5, a cell identifier and a cell signal quality of the cell 6, and a cell identifier and a cell signal quality of the cell 8.

Illustratively, cell signal quality may be characterized by Reference Signal Received Power (RSRP) and/or Reference Signal Received Quality (RSRQ). For example, the measurement report includes RSRP1 and RSRQ1 of cell 4, RSRP2 and RSRQ2 of cell 5, RSRP3 and RSRQ3 of cell 6, and RSRP4 and RSRQ4 of cell 8.

It should be noted that the neighboring cell included in the measurement report reported by the terminal device may be the same as or different from the cell corresponding to the cell selection parameter included in the second message of S10112.

S10115, the first network device receives the measurement report.

The first network equipment receives a measurement report reported by the terminal equipment, wherein the measurement report comprises a cell identifier and cell signal quality of at least one neighboring cell.

It should be noted that, in the embodiment of the present application, the sequence of S10113 and S10115 is not limited, and the first network device may receive the second message first or receive the measurement report first, where the sequence does not affect the effect of the embodiment of the present application.

S10116, the first network device determines a candidate reestablishing cell.

And the first network equipment determines a candidate reestablishing cell according to the cell signal quality in the measurement report and the cell selection parameter of the adjacent cell corresponding to the cell signal quality.

In one implementation, the first network device selects a parameter (e.g., Q) according to the cell signal quality (RSRP and RSRQ) of the neighbor cells included in the measurement report and the cell selection parameter (e.g., Q) of the neighbor cell corresponding to the cell signal quality_rxlevmin、Q_qualmin、Q_{rxlevminoffset}、Q_{qualminoffset}、P_compensationAnd Qoffset_tempAt least one parameter of) respectively calculate S of each cell included in the measurement report_rxlevAnd S_qualAnd will satisfy the S criteria (S) for cell selection_rxlev>0 and S_qual>0) Determining the cell to be a candidate reestablishing cell; or, in another possible implementation, S is_rxlev>0 or S_qual>The cell of 0 is determined as a candidate reestablishing cell; the embodiments of the present application are not limited thereto. Wherein the first network device is calculating S of a certain cell_rxlevOr S_qualQ corresponding to the cell_rxlevmeasCan be the RSRP of the cell, the Q corresponding to the cell_qualmeasMay be the RSRQ of the cell; for example, cell 4 corresponds to Q_rxlevmeas-4Q for RSRP1 corresponding to cell 4_qualmeas-4Is RSRQ 1; q corresponding to cell 5_rxlevmeas-5Q for RSRP2 corresponding to cell 5_qualmeas-5Is RSRQ 2; q for cell 6_rxlevmeas-6Q for RSRP3, cell 6_qualmeas-6Is RSRQ 3; q corresponding to cell 8_rxlevmeas-8Q for RSRP4 corresponding to cell 8_qualmeas-8Is RSRQ 4.

Illustratively, at S10115, the measurement report reported by the terminal device 200 and received by the network device 101 includes the cell signal quality (RSRP1 and RSRQ1) of cell 4,Cell signal quality of cell 5 (RSRP2 and RSRQ2), cell signal quality of cell 6 (RSRP3 and RSRQ3), and cell signal quality of cell 8 (RSRP4 and RSRQ 4); at S10113, network device 101 receives the cell selection parameter (e.g., Q) for cell 4 sent by network device 102_rxlevmin-4、Q_qualmin-4、Q_{rxlevminoffset-4}、Q_{qualminoffset-4}、P_{compensation-4}And Qoffset_temp-4At least one parameter of); network device 101 also receives a cell selection parameter (e.g., Q) for cell 5 sent by network device 103_rxlevmin-5、Q_qualmin-5、Q_{rxlevminoffset-5}、Q_{qualminoffset-5}、P_{compensation-5}And Qoffset_temp-5At least one parameter), a cell selection parameter (e.g., Q) of cell 6_rxlevmin-6、Q_qualmin-6、Q_{rxlevminoffset-6}、Q_{qualminoffset-6}、P_{compensation-6}And Qoffset_temp-6At least one parameter) and a cell selection parameter (e.g., Q) of cell 7_rxlevmin-7、Q_qualmin-7、Q_{rxlevminoffset-7}、Q_{qualminoffset-7}、P_{compensation-7}And Qoffset_temp-7At least one parameter of); network device 101 also receives a cell selection parameter (e.g., Q) for cell 8 sent by network device 104_rxlevmin-8、Q_qualmin-8、Q_{rxlevminoffset-8}、Q_{qualminoffset-8}、P_{compensation-8}And Qoffset_temp-8At least one parameter), a cell selection parameter (e.g., Q) of cell 9_rxlevmin-9、Q_qualmin-9、Q_{rxlevminoffset-9}、Q_{qualminoffset-9}、P_{compensation-9}And Qoffset_temp-9At least one parameter).

Network device 101 relies on RSRP1 (i.e., Q) of cell 4_rxlevmeas-4) And Q_rxlevmin-4、Q_{rxlevminoffset-4}、P_{compensation-4}And Qoffset_temp-4Calculates S of the cell 4_rxlev(ii) a According to RSRQ1 (i.e. Q)_qualmeas-4) And Q_qualmin-4、Q_{qualminoffset-4}And Qoffset_temp-4Calculates S of the cell 4_qual. If S of cell 4_rxlev>0 and S_qual>0, then cell 4 is determined to be a candidate reestablishing cell.

Network device 101 relies on RSRP2 (i.e., Q) of cell 5_rxlevmeas-5) And Q_rxlevmin-5、Q_{rxlevminoffset-5}、P_{compensation-5}And Qoffset_temp-5Calculates S of the cell 5_rxlev(ii) a According to RSRQ2 (i.e. Q)_qualmeas-5) And Q_qualmin-5、Q_{qualminoffset-5}And Qoffset_temp-5Calculates S of the cell 5_qual. If S of cell 5_rxlev>0 and S_qual>0, then cell 5 is determined to be a candidate re-establishment cell.

Network device 101 relies on RSRP3 (i.e., Q) of cell 6_rxlevmeas-6) And Q_rxlevmin-6、Q_{rxlevminoffset-6}、P_{compensation-6}And Qoffset_temp-6Calculates S of the cell 6_rxlev(ii) a According to RSRQ3 (i.e. Q)_qualmeas-6) And Q_qualmin-6、Q_{qualminoffset-6}And Qoffset_temp-6Calculates S of the cell 6_qual. If S of cell 6_rxlev>0 and S_qual>0, then cell 6 is determined to be a candidate re-establishment cell.

Network device 101 relies on RSRP4 (i.e., Q) of cell 8_rxlevmeas-8) And Q_rxlevmin-8、Q_{rxlevminoffset-8}、P_{compensation-8}And Qoffset_temp-8Calculates S of cell 8_rxlev(ii) a According to RSRQ4 (i.e. Q)_qualmeas-8) And Q_qualmin-8、Q_{qualminoffset-8}And Qoffset_temp-8Calculates S of cell 8_qual. If S of cell 8_rxlev>0 and S_qual>0, then cell 8 is determined to be a candidate re-establishment cell.

Illustratively, cell 4, cell 5, cell 6, and cell 8 satisfy the S criteria for cell selection, determining cell 4, cell 5, cell 6, and cell 8 as candidate re-establishment cells.

Of course, the first network device may also determine the candidate reestablishing cell according to other preset rules, and the implementation manner is only an example, and the application does not limit this.

The candidate re-establishment cell list information includes information of one or more candidate re-establishment cells. For example, the information of the candidate re-establishment cell may include at least one of cell identification and frequency point information. In some examples, the information of the candidate re-establishment cell may include a cell identity, for example, a Cell Global Identity (CGI); in other examples, the information of the candidate re-establishment cell may include a cell identifier and frequency point information, for example, the cell identifier is a Physical Cell Identifier (PCI); the present embodiment is not limited thereto. Illustratively, the information of the candidate re-establishment cells includes information of the cell 4, the cell 5, the cell 6 and the cell 8. For example, the candidate re-establishment cell list information includes CGIs of cell 4, cell 5, cell 6, and cell 8. The network device to which the candidate reestablishing cell belongs is the candidate network device, and the candidate network device is a part or all of the at least one second network device. Illustratively, cell 4 belongs to network device 102, cells 5 and 6 belong to network device 103, and cell 8 belongs to network device 104; network device 101 determines that cell 4, cell 5, cell 6, and cell 8 are candidate reestablished cells, and then the candidate network devices are network device 102, network device 103, and network device 104. It is to be understood that the information of the candidate re-establishment cell may also include other information of the cell, for example, priority information of the candidate re-establishment cell (for example, the priority information may be, in S102, priority indication information of the candidate re-establishment cell) may be included; this is not limited in the embodiments of the present application.

Further, in one implementation, the candidate re-established cells have priorities, and the first network device may determine the priority of each candidate re-established cell. For example, network device 101 compares Q_rxlevmeas-4、Q_rxlevmeas-5、Q_rxlevmeas-6And Q_rxlevmeas-8Size of (2), Q_rxlevmeasThe larger the value, the higher the priority of the cell; or network device 101 compares Q_qualmeas-4、Q_qualmeas-5、Q_qualmeas-6And Q_qualmeas-8Size of (2), Q_qualmeasThe larger the value, the higher the priority of the cell. Or, for example, the network device 101 compares S corresponding to each candidate re-establishment cell_rxlevValue, S_rxlevThe larger the value, the higher the priority of the cell; or the network device 101 compares S corresponding to each candidate reestablishing cell_qualValue, S_qualThe larger the value, the higher the priority of the cell. Alternatively, the network device determines the priority according to the load condition of each candidate reestablishing cell or cell information (such as cell size, cell type, etc.). The present embodiment is not limited thereto.

Further, after receiving the measurement report, the first network device may determine to initiate a handover preparation procedure according to the measurement report, as shown in fig. 4-1, the method may further include S10117-S1011 a:

s10117, the first network device determines the destination network device.

In one implementation, the first network device determines to perform handover according to the received measurement report, and determines a target cell to which the terminal device needs to be handed over, that is, determines a target network device (the target cell belongs to the target network device). For example, the first network device determines, according to the neighbor information in the measurement report, a destination network device to which the terminal device needs to be handed over, where the destination network device may be one of the second network devices (the destination network device may be one of the candidate network devices or is not one of the candidate network devices), or the destination network device and the second network device are different network devices, and the embodiment is not limited thereto.

It should be noted that the target cell determined by the first network device and switched by the terminal device may belong to the first network device, that is, the target network device to which the terminal device needs to be switched may also be the first network device; in this case, S10118 and S10119 may not be performed.

Illustratively, the measurement report reported by the terminal device 200 to the network device 101 includes the cell id and the cell signal quality of the cell 4, the cell id and the cell signal quality of the cell 5, the cell id and the cell signal quality of the cell 6, and the cell id and the cell signal quality of the cell 8; the network device 101 determines one of the cells as a destination cell, and the network device to which the destination cell belongs is determined as a destination network device. For example, the network device 101 determines the cell with the highest signal quality as the target cell, and if the value of the cell signal quality of the cell 4 in the measurement report is the largest, the network device 101 determines the network device 102 as the target network device; or, the network device 101 selects any one of the cell 4, the cell 5, the cell 6, and the cell 8 as the target cell, for example, selects the cell 4 as the target cell for handover, and then determines the network device 102 as the target network device for handover. The method for determining the destination network device by the network device 101 may depend on network implementation, for example, the destination network device may also be determined by combining load amounts of the network devices, which is not limited in this embodiment.

S10118, the first network device and the destination network device perform a handover preparation procedure.

In one implementation, a first network device sends a handover request message to a destination network device; after receiving the handover request message, the destination network device performs admission control, such as allocating a random access resource, a cell radio network temporary identifier (C-RNTI), and the like to the terminal device; then, the destination network device sends a handover request acknowledgement message to the first network device, where the handover request acknowledgement message may include parameters required for the terminal device to access the destination network device, such as a cell identifier of the destination cell (e.g., a PCI of the destination cell), random access resources required for accessing the destination cell, a C-RNTI, and the like. In one implementation, the handover request message includes context information of the terminal device, for example, the context information may include radio access capability information, security parameters, radio bearer configuration, RRM configuration, or the like of the terminal device, and the embodiment is not limited thereto.

S10119, the first network device sends a handover message to the terminal device.

In one implementation, after receiving a handover request confirm message sent by a destination network device, a first network device sends a handover message to a terminal device, where the handover message may be an RRC message, for example, the handover message may be an RRC reconfiguration message including a synchronization reconfiguration information element (reconfiguration _ complete) or an RRC connection reconfiguration message including a mobility control information element (mobility control info), and the handover message includes at least one of a cell identifier of a destination cell (such as a PCI of the destination cell), a random access resource required to access the destination cell, or a cell radio network temporary identifier (C-RNTI), for example.

S1011a, the first network device sends the context information of the terminal device to the candidate network device.

Optionally, the first network device may further send context information of the terminal device to the network device (i.e., the candidate network device) to which the at least one candidate reestablishing cell determined in S10116 belongs, where the candidate network device may include one or more network devices, and the candidate network device is one or more of the second network devices.

Exemplarily, the candidate network devices determined in S10116 include network device 102, network device 103, and network device 104. In one case, the destination network device is one of the candidate network devices, and the first network device sends context information of the terminal device to the other candidate network devices except the destination network device; for example, in S10117, if the network device 101 determines that the network device 102 is the destination network device, in S10118, the handover request message sent by the first network device to the destination network device includes the context information of the terminal device 200, and in S1011a, the network device 101 sends the context information of the terminal device 200 to the network device 103 and the network device 104, respectively. In one case, the destination network device is not one of the candidate network devices, then in S1011a, the first network device sends the context information of the terminal device to each candidate network device respectively; for example, network device 101 sends context information of terminal device 200 to network device 102, network device 103, and network device 104, respectively.

In one implementation, the first network device may send the context information of the terminal device to the candidate network device through a message of the Xn interface. Alternatively, the first network device may send the context information of the terminal device to the candidate network device via a message of the X2 interface.

In one implementation, the first network device may send the context information of the terminal device to the candidate network device using an existing Xn message or an X2 message. For example, in an implementation manner, the Xn message is a handover request message, where the handover request message includes context information of the terminal device, and the handover request message may further include second indication information, where the second indication information is used to indicate whether to perform a handover preparation procedure. For example, the second indication information may be a binary value (for example, "0" indicates that the handover preparation procedure is not performed, "1" indicates that the handover preparation procedure is performed), or a boolean value (for example, "False" indicates that the handover preparation procedure is not performed, "True" indicates that the handover preparation procedure is performed), or other forms, and the embodiment is not limited thereto.

For example, in step S10118, the handover request message sent by the first network device to the destination network device includes the second indication information, and for example, the value of the second indication information is "1", after receiving the handover request message, the destination network device obtains the context information of the terminal device, performs admission control, for example, allocates a random access resource, a cell radio network temporary identifier (C-RNTI), and the like to the terminal device, and then sends a handover request confirmation message to the first network device. In S1011a, the Xn messages (such as the handover request message) respectively sent by the first network device to the candidate network devices except the destination network device include the second indication information, for example, if the value of the second indication information is "0", the candidate network devices (except the destination network device) obtain the context information of the terminal device after receiving the handover request message.

For example, in another implementation manner, the handover request message sent by the first network device to the destination network device includes context information of the terminal device, but the handover request message does not include the second indication information, and then the destination network device performs a handover preparation procedure after receiving the handover request message. The Xn messages (such as the handover request message) respectively sent by the first network device to the candidate network devices except the destination network device include the context information of the terminal device, and the Xn messages (such as the handover request message) include the second indication information, then the candidate network devices do not perform the handover preparation process after receiving the handover request message. The second indication information may be cell information, for example, the second indication information is a cell ForUEContextTransfer or other name, or the second indication information may be in other forms, which is not limited in this embodiment.

In one implementation, the Xn message may be a newly defined Xn message. For example, a UE context transfer (UE context transfer) message is defined for the first network device to send context information of the terminal device to other candidate network devices except the destination network device. Illustratively, the first network device sends context information of the terminal device to a candidate network device other than the destination network device using a newly defined Xn message, and after receiving the UE context transfer message, the candidate network device may send an acknowledgement message, such as a UE context transfer acknowledgement (UE context transfer acknowledge) message, to the first network device.

The embodiment of the present application does not limit a specific manner in which the first network device sends the context information of the terminal device to the candidate network device.

In this way, each candidate network device may obtain context information for the terminal device. Under the condition of radio link failure or handover failure, the terminal device selects a target cell as the RRC reestablishment from at least one candidate reestablishment cell, and as the network device to which the target cell belongs is one of the candidate network devices, that is, the network device to which the target cell belongs has the context information of the terminal device, the context information does not need to be acquired from the first network device again, so that the time of the RRC reestablishment process is shortened, and the recovery of the RRC connection is accelerated.

It should be noted that, in this embodiment of the application, the sequence of S10116 and S10117 is not limited, that is, the first network device may determine the candidate reestablished cell first and then determine the destination network device, or the first network device may determine the destination network device first and then determine the candidate reestablished cell, or the first network device may determine the destination network device and the candidate reestablished cell at the same time. The embodiment of the present application does not limit the sequence of S10118 and S1011a, that is, the first network device may first perform a handover preparation procedure with the destination network device, and then send the context information of the terminal device to the candidate network device; or the first network device may send the context information of the terminal device to the candidate network device first, and then perform a handover preparation procedure with the destination network device; or the first network device may perform a handover preparation procedure with the destination network device at the same time, and send the context information of the terminal device to the candidate network device. The embodiment of the present application does not limit the sequence of S10119 and S1011a, that is, the first network device may first send the handover message to the terminal device, and then send the context information of the terminal device to the candidate network devices except the destination network device; or the first network device may send the context information of the terminal device to the candidate network devices except the destination network device first, and then send the handover message to the terminal device; or the first network device may simultaneously send the handover message to the terminal device and send context information of the terminal device to the candidate network devices other than the destination network device.

In this embodiment, some steps may be added or deleted according to actual situations. For example, the first method may not include S10117-S10119, that is, the method provided in the embodiment of the present application is also applicable to a scenario in which a radio link failure may occur, other than a scenario in which the terminal device switches, for example, a scenario in which a radio link failure occurs when the terminal device accesses the source base station.

The second mode, as shown in fig. 4-2, may include:

s10121, the terminal device reports the measurement report.

The specific process of reporting the measurement report by the terminal device may refer to the description of S10114, which is not described herein again.

S10122, the first network device receives the measurement report.

And the first network equipment receives the measurement report reported by the terminal equipment.

S10123, the first network device determines at least one fourth network device.

The first network device determines the fourth network device according to the measurement information of the cell included in the measurement report, which may include, for example, the cell identity and the cell signal quality. For example, the measurement report includes the cell identifier of at least one neighboring cell and the corresponding cell signal quality. The fourth network device is a network device corresponding to a part or all of cells in at least one neighboring cell in the measurement report; the fourth network device may include one or more network devices.

S10124, the first network device and the destination network device perform a handover preparation procedure.

The first network device can determine that the terminal device needs to be switched according to the received measurement report, and determine a target network device for switching. For example, the first network device determines, according to the neighbor cell information in the measurement report, a destination network device to which the terminal device needs to be handed over, where the destination network device may be one of the at least one fourth network device. As described in step S10117, details are not repeated here.

Illustratively, the serving cell of the terminal device 200 is cell 1, and the measurement report reported by the terminal device 200 includes a cell id and a cell signal quality of cell 4, a cell id and a cell signal quality of cell 5, a cell id and a cell signal quality of cell 6, and a cell id and a cell signal quality of cell 8. Cell 4 belongs to network device 102, cells 5 and 6 belong to network device 103, and cell 8 belongs to network device 104; after receiving the measurement report, the network device 101 may determine the network device 102 and the network device 103 as a fourth network device, or may determine the network device 102, the network device 103, and the network device 104 as a fourth network device, which is not limited in this embodiment. For the following description, as an example, the fourth network device determined by the network device 101 includes the network device 102, the network device 103, and the network device 104. In addition, in one example, the network device 101 determines the cell 4 as the destination cell, that is, the network device 102 as the destination network device according to the measurement report.

And after the target network equipment is determined, the first network equipment and the target network equipment perform a switching preparation process. In one implementation, a first network device sends a handover request message to a destination network device; after receiving the handover request message, the destination network device performs admission control, for example, allocates random access resources, C-RNTI, and the like to the terminal device; then, the destination network device sends a handover request acknowledgement message to the first network device, where the handover request acknowledgement message may include parameters required for the terminal device to access the destination network device, such as a cell identifier of the destination cell (e.g., a PCI of the destination cell), random access resources required for accessing the destination cell, a C-RNTI, and the like.

In an implementation manner, the handover request message may include context information of the terminal device, for example, the context information includes radio access capability information, security parameters, radio bearer configuration, RRM configuration, or the like of the terminal device, and the embodiment is not limited thereto.

In one implementation, the handover request message may further include a cell signal quality of the destination cell.

S10125, the first network device sends a handover message to the terminal device.

And after receiving the switching request confirmation message from the target network equipment, the first network equipment sends a switching message to the terminal equipment. The specific manner of sending the handover message by the first network device may refer to S10119, which is not described herein again.

S10126, the first network device sends the cell signal quality and the context information of the terminal device to a fourth network device other than the destination network device.

Wherein the first network device may send the cell signal quality and the context information of the terminal device to one or more fourth network devices, respectively.

In one implementation, the first network device sends the corresponding cell signal quality and context information of the terminal device to a fourth network device other than the destination network device. Illustratively, referring to the example in S10124, the network device 101 transmits the cell signal qualities of the cell 5 and the cell 6 included in the measurement report and the context information of the terminal device to the network device 103; the cell signal quality of the cell 8 and the context information of the terminal device included in the measurement report are sent to the network device 104.

In one implementation, the first network device may send the cell signal quality and the context information of the terminal device to a fourth network device other than the destination network device through a message of an Xn interface. Alternatively, the first network device may send the cell signal quality and the context information of the terminal device to a fourth network device other than the destination network device through a message of an X2 interface.

In one implementation, the first network device may send the cell signal quality and the context information of the terminal device to a fourth network device other than the destination network device using an existing Xn message or an X2 message. Illustratively, in one implementation, the Xn message is a handover request message, and the Xn message (e.g., the handover request message) sent by the first network device includes cell signal quality and context information of the terminal device. In addition, the handover request message may further include third indication information, where the third indication information is used to indicate whether to perform a handover preparation procedure. For example, the third indication information may be a binary value (for example, "0" indicates that the handover preparation procedure is not performed, "1" indicates that the handover preparation procedure is performed), or a boolean value (for example, "False" indicates that the handover preparation procedure is not performed, "True" indicates that the handover preparation procedure is performed), or other forms, and the embodiment is not limited thereto.

For example, the first network device sends Xn messages (such as handover request messages) to fourth network devices other than the destination network device, respectively, where the Xn messages include cell signal quality of a cell corresponding to the fourth network device (other than the destination network device), context information of the terminal device, and third indication information, and in S10124, for example, in the handover request message sent by the first network device to the destination network device, in addition to the context information of the terminal device and the cell signal quality of a cell belonging to the destination network device, the Xn messages may also include the third indication information, for example, the value of the third indication information included in the handover request message sent by the first network device to the destination network device is "1"; after receiving the switching request message, the target network device acquires the cell signal quality of the cell corresponding to the target network device and the context information of the terminal device, performs admission control, and then sends a switching request confirmation message to the first network device. In S10126, the value of the third indication information included in the Xn message (e.g., handover request message) sent by the first network device to the fourth network device except the destination network device is "0", and after receiving the Xn message (e.g., handover request message), the fourth network device except the destination network device obtains the cell signal quality of the cell corresponding to the network device and the context information of the terminal device, and does not perform a handover preparation procedure.

For example, in another implementation, the third indication information may be cell information, such as a ForUEContextTransfer or other name. The handover request message sent by the first network device to the destination network device includes the cell signal quality of the cell belonging to the destination network device and the context information of the terminal device, but the handover request message does not include the third indication information, so that after receiving the handover request message, the destination network device obtains the cell signal quality of the cell corresponding to the destination network device and the context information of the terminal device, and performs a handover preparation procedure. The Xn messages (such as handover request messages) respectively sent by the first network device to the fourth network device except the destination network device include the corresponding cell signal quality, the context information of the terminal device, and the third indication information; after receiving the Xn message (such as a handover request message), the fourth network device except the destination network device acquires the cell signal quality of the cell corresponding to the network device and the context information of the terminal device, and does not perform a handover preparation procedure. The third indication information may also be in other forms, and the embodiment is not limited to this.

In one implementation, the first network device may send the cell signal quality and the context information of the terminal device to a fourth network device other than the destination network device using a newly defined Xn message. For example, a UE context transfer (UE context transfer) message is defined for the first network device to send the corresponding cell signal quality and the context information of the terminal device to a fourth network device other than the destination network device.

The embodiment of the present application does not limit the specific manner in which the first network device sends the corresponding cell signal quality and the context information of the terminal device to the fourth network device except the destination network device.

It should be noted that, in a specific implementation, the first network device may respectively carry the cell signal quality and the context information of the terminal device in two different messages (e.g., message a and message B) to send to a fourth network device other than the destination network device, where the two different messages may be an existing Xn message or a newly defined Xn message, and the message type of the first network device sending the cell signal quality and the context information of the terminal device may be the same or different, for example, message a reuses an existing Xn message 1, message B reuses an existing Xn message 2, or message a is a newly defined Xn message 3, message B is a newly defined Xn message 4, or message a reuses an existing Xn message 1, message B is a newly defined Xn message 4, or message a is a newly defined Xn message 3, message B reuses the existing Xn message 2. In addition, the embodiment of the present application does not limit the sequence of sending the cell signal quality and sending the context information of the terminal device by the first network device. The first network device may first send the cell signal quality; the context information of the terminal device may also be sent first. In another implementation, the first network device may not send the context information of the terminal device to the fourth network device. This is not limited in the embodiments of the present application.

It should be noted that, in this embodiment, some steps may be added or deleted according to actual situations. For example, the method two may not include S10124 and S10125, that is, the method provided in the embodiment of the present application is also applicable to a scenario in which a radio link failure may occur, other than the scenario in which the terminal device switches. In a non-handover scenario, in S10126, the first network device sends the corresponding cell signal quality and the context information of the terminal device to each fourth network device determined in S10123.

S10127, the fourth network device receives the corresponding cell signal quality and the context information of the terminal device.

Each fourth network device receives the corresponding cell signal quality from the first network device, so that each fourth network device can determine a candidate reestablishing cell according to the received cell signal quality of the cell belonging to the network device.

In addition, each fourth network device receives the context information of the terminal device from the first network device, so that each fourth network device can acquire the context information of the terminal device.

S10128, the fourth network device determines a candidate reestablishing cell.

Specifically, each fourth network device may determine a candidate re-establishment cell according to the received cell signal quality of the cell belonging to the fourth network device and the cell selection parameter corresponding thereto.

In one implementation, the fourth network device is based on the cell signal quality (RSRP and RSRQ) of a cell belonging to the fourth network device received from the first network device and based on a cell selection parameter (e.g., Q) corresponding to the cell_rxlevmin、Q_qualmin、Q_{rxlevminoffset}、Q_{qualminoffset}、P_compensationAnd Qoffset_tempAt least one parameter) of the received signal quality of each cell, respectively calculating S of the cell corresponding to the received signal quality of each cell_rxlevAnd S_qualAnd will satisfy the S criteria (S) for cell selection_rxlev>0 and S_qual>0) The cell of (a) is determined as a candidate re-establishment cell. Alternatively, in another possible example, S may be_rxlev>0 or S_qual>The cell of 0 is determined as a candidate re-establishment cell, and the embodiment is not limited thereto. Wherein the fourth network device is calculating S of a certain cell_rxlevOr S_qualQ corresponding to the cell_qualmeasCan be the RSRP of the cell, the Q corresponding to the cell_qualmeasMay be the RSRQ of the cell. For example, the measurement report received by the first network device includes measurement information of cell 4, cell 5, cell 6, and cell 8, such as RSRP1 and RSRQ1 of cell 4, RSRP2 and RSRQ2 of cell 5, RSRP3 and RSRQ3 of cell 6, and RSRP4 and RSRQ4 of cell 8, then S is calculated_rxlevAnd S_qualQ corresponding to cell 4_rxlevmeas-4Q for RSRP1 corresponding to cell 4_qualmeas-4Is RSRQ 1; q corresponding to cell 5_rxlevmeas-5Q for RSRP2 corresponding to cell 5_qualmeas-5Is RSRQ 2; q for cell 6_rxlevmeas-6Q for RSRP3, cell 6_qualmeas-6Is RSRQ 3; q corresponding to cell 8_rxlevmeas-8Q for RSRP4 corresponding to cell 8_qualmeas-8Is RSRQ 4.

Illustratively, taking cell 4 as an example, network device 102 receives cell signal qualities (RSRP1 and RSRQ1) of cell 4 from network device 101, and network device 102 obtains cell selection parameters (e.g., Q) of cell 4 in the network device_rxlevmin-4、Q_qualmin-4、Q_{rxlevminoffset-4}、Q_{qualminoffset-4}、P_{compensation-4}And Qoffset_temp-4At least one parameter) of the network device 102 according to RSRP1 (i.e., Q) of cell 4_rxlevmeas-4) And Q_rxlevmin-4、Q_{rxlevminoffset-4}、P_{compensation-4}And Qoffset_temp-4Calculates S of the cell 4_rxlev(ii) a RSRQ1 (i.e., Q) according to cell 4_qualmeas-4) And Q_qualmin-4、Q_{qualminoffset-4}And Qoffset_temp-4Calculates S of the cell 4_qual(ii) a If S of cell 4_rxlev>0 and S_qual>0, then cell 4 is determined to be a candidate reestablishing cell. Network device 103 calculates S for cell 5 or cell 6_rxlevAnd S_qualAnd network device 104 calculates S of cell 8_rxlevAnd S_qualThe method of (3) can refer to the above examples, and is not described herein again. As an example, the network device 103 determines the cells 5 and 6 as candidate reestablishing cells through calculation, and the network device 104 determines the cell 8 as a candidate reestablishing cell through calculation.

Of course, the fourth network device may also determine the candidate reestablishing cell according to other preset rules, and the implementation manner is only an example, and the present application does not limit this.

Further, the fourth network device determines reestablished cell list information, which includes information of one or more candidate reestablished cells. Illustratively, the network device 102 determines reestablishment cell list information, including information of candidate reestablishment cells (e.g., cell 4); the network device 103 determines reestablishment cell list information including information of candidate reestablishment cells (e.g., cell 5 and cell 6); the network device 104 determines re-establishment cell list information, including information of candidate re-establishment cells (e.g., cell 8).

S10129, the third network device sends the reestablished cell list information to the first network device, respectively.

The third network device is one or more of the fourth network devices, and the third network device is one of the fourth network devices that can determine at least one candidate re-establishment cell. In one possible example, the destination network device is one of the third network devices.

Illustratively, the serving cell of the terminal device 200 is cell 1, and the measurement report reported by the terminal device 200 to the first network device (network device 101) includes a cell identifier and a cell signal quality of cell 4, a cell identifier and a cell signal quality of cell 5, a cell identifier and a cell signal quality of cell 6, and a cell identifier and a cell signal quality of cell 8. Cell 4 belongs to network device 102, cells 5 and 6 belong to network device 103, and cell 8 belongs to network device 104; network device 101 receives the measurement report and determines that the fourth network device includes network device 102, network device 103, and network device 104. For example, network device 102 determines that cell 4 is a candidate re-establishment cell; network device 103 determines that cell 5 and cell 6 are candidate re-establishment cells; network device 104 determines that cell 8 is a candidate re-establishment cell; then, the third network device includes network device 102, network device 103, and network device 104. For example, network device 102 determines that cell 4 is a candidate re-establishment cell; network device 103 determines that cell 5 and cell 6 are candidate re-establishment cells; the network device 104 determines that the cell 8 does not satisfy the S criterion for cell selection, and determines that the cell 8 is not a candidate reestablishing cell; then, the third network device includes network device 102 and network device 103.

The third network device sends the list information of the reestablished cells to the first network device respectively, wherein the list information of the reestablished cells comprises one or more candidate reestablished cells in the third network device. For example, the third network device includes network device 102, network device 103, and network device 104, then the rebuilt cell list information sent by network device 102 to network device 101 includes information of cell 4 (e.g., cell identifier of cell 4), the rebuilt cell list information sent by network device 103 to network device 101 includes information of cell 5 and cell 6 (e.g., cell identifier of cell 5, cell identifier of cell 6), and the rebuilt cell list information sent by network device 104 to network device 101 includes information of cell 8 (e.g., cell identifier of cell 8).

In one implementation, the third network device may send the reestablished cell list information to the first network device through a message of an Xn interface. Alternatively, the third network device may send the reestablished cell list information to the first network device through a message of an X2 interface.

In one implementation, the third network device may send the reestablished cell list information to the first network device using an existing Xn message. Illustratively, the first network device sends the cell signal quality and the context information of the terminal device to the third network device by using a handover request message, and the third network device may send the reestablishment cell list information to the first network device by using a handover request confirmation message. For example, the network device 103 sends a handover request acknowledge message to the network device 101, which includes the information of the reestablished cell list (e.g. the information of cell 5 and cell 6).

In one implementation, the third network device may send the reestablished cell list information to the first network device using a newly defined Xn message. For example, a re-establishment cell list information transmission message is defined for the third network device to send re-establishment cell list information to the first network device.

In one implementation, the reestablished cell list information may also be sent to the first network device using, in part, the existing Xn message and, in part, the newly defined Xn message. For example, the destination network device sends the reestablished cell list information to the first network device by using the handover request confirm message, and the third network device except the destination network device sends the reestablished cell list information to the first network device by using the newly defined Xn message.

The embodiment of the present application does not limit a specific manner in which the third network device sends the reestablished cell list information to the first network device.

S1012a, the first network device receives the reestablished cell list information.

And the first network equipment receives corresponding reestablishment cell list information from each third network equipment respectively. The first network device determines candidate reestablishment cell list information according to reestablishment cell list information respectively received from the third network device, wherein the candidate reestablishment cell list information includes information of one or more candidate reestablishment cells. Illustratively, the information of the reestablished cell list received by the network device 101 from the network device 102 includes information of the cell 4; the reestablished cell list information received by the network device 101 from the network device 103 includes information of the cell 5 and the cell 6; the reestablished cell list information received by the network device 101 from the network device 104 includes information of the cell 8; network device 101 determines that the candidate re-establishment cell list information includes information for cell 4, cell 5, cell 6, and cell 8. Illustratively, the candidate re-establishment cell list information may include cell identities of cell 4, cell 5, cell 6, and cell 8.

Further, the first network device may further determine a priority corresponding to each candidate reestablished cell sent by the third network device, and the determination manner may refer to the description of the first network device determining the priority of each candidate reestablished cell in S10116, which is not described herein again.

S102, the first network equipment sends a first message to the terminal equipment.

The first network equipment generates a first message, wherein the first message comprises candidate reestablishment cell list information determined by the first network equipment. For example, the candidate re-establishment cell list information may be list information of candidate re-establishment cells determined by the first network device according to cell signal quality included in the measurement report and cell selection parameters of the corresponding cell in the first S101 mode; or the first network device in the second mode S101 determines candidate reestablished cell list information according to reestablished cell list information received from the third network device.

It should be noted that the candidate re-establishment cell list information may further include information of the serving cell, for example, the first network device determines whether the serving cell meets the S criterion of cell selection according to the cell signal quality of the serving cell and the cell selection parameter of the corresponding serving cell, and if so, the first network device may determine the serving cell as the candidate re-establishment cell. For example, the serving cell (cell 1) satisfies the S criterion of cell selection, the candidate re-establishment cell list information may include a cell identifier of the cell 1, and the cell identifier may be, for example, a Physical Cell Identifier (PCI) PCI or a Cell Global Identifier (CGI), but the embodiment is not limited thereto. The serving cell may have a priority, which may be determined by the first network device according to the method described in S10116, for example.

The first network device sends the first message to the terminal device. In one implementation, the first message may be an existing RRC message; for example, the first message is a handover message, and the candidate reestablishing cell list information may be carried in the handover message sent by the first network device to the terminal device, for example, the handover message sent by the first network device to the terminal device in S10119 or S10125 includes the candidate reestablishing cell list information. That is, the first message transmitted by the first network device in S102 is the same message as the handover message transmitted in S10119 or S10125, or step S102 is the same step as S10119 or S10125, that is, S102 may not be separately performed. In one implementation, the first message may be a newly defined RRC message; for example, the re-establishment assistance message includes candidate re-establishment cell list information.

In one implementation, the one or more candidate re-established cells in the re-established cell list information have a priority, such as the priority determined by the first network device in S10116 or S1012 a. The first network device may indicate the priority of the candidate re-establishment cell by the first message.

In one implementation, the candidate re-establishment cell list information includes priority indication information of the candidate re-establishment cell, and the priority indication information is used for indicating the priority of the cell as the target cell for RRC re-establishment. Illustratively, the candidate reestablishment cell list information transmitted by the network device 101 to the terminal device 200 is shown in table 1. As an example, a smaller value of the priority indicates a higher priority.

TABLE 1

Cell identity	Priority level
		Cell identity of cell 4	3
Cell identity of cell 5	2
		Cell identity of cell 6	1
Cell identity of cell 8	4

In one implementation, the first network device implicitly indicates a priority of the candidate re-establishment cell. For example, the candidate re-establishment cell list information includes a plurality of candidate re-establishment cells arranged in order of priority from high to low or in order of priority from low to high. Illustratively, the candidate reestablishing cell list information sent by the network device 101 to the terminal device 200 is shown in table 2, where a plurality of candidate reestablishing cells are arranged in order of priority from high to low, the priority of the cell 6 is the highest, and the priority of the cell 8 is the lowest.

TABLE 2

Cell identity
	Cell identity of cell 6
Cell identity of cell 5
	Cell identity of cell 4
Cell identity of cell 8

In one implementation, the first network device may also send the candidate re-establishment cell list information and the priority indication information in the first message, respectively. Illustratively, the network device 101 transmits candidate re-establishment cell list information as shown in table 3, and priority indication information as shown in table 4. The candidate reestablished cells in table 3 correspond one-to-one to the priority indication information in table 4.

TABLE 3

Cell identity
	Cell identity of cell 4
Cell identity of cell 5
	Cell identity of cell 6
Cell identity of cell 8

TABLE 4

Priority level
	3
2
	1
4

In one implementation, the first message may include fifth indication information, where the fifth indication information is used to indicate that the network device to which the candidate re-establishment cell belongs stores context information of the terminal device.

S103, the terminal equipment receives the first message.

S104, the terminal equipment carries out RRC reestablishment.

And under the conditions of radio link failure or switching failure and the like, the terminal equipment determines a target cell according to the candidate reestablishment cell list information in the first message and initiates RRC reestablishment to the target cell.

In one implementation, if the candidate reestablishing cells have no priority, the terminal device may arbitrarily select one candidate reestablishing cell from the candidate reestablishing cell list as the target cell.

In one implementation, if the candidate reestablishing cells have priorities, the terminal device may select one candidate reestablishing cell from the candidate reestablishing cell list as the target cell in an order from high priority to low priority. Specifically, the terminal device selects one of the one or more candidate reestablishing cells as the target cell in the order from high priority to low priority according to the priority of the candidate reestablishing cells in the candidate reestablishing cell list information. For example, the terminal device selects a candidate reestablishing cell with the highest priority in the candidate reestablishing cell list as a target cell, performs an RRC reestablishment procedure with the target cell, and if the RRC reestablishment fails, selects a candidate reestablishing cell with the second priority in the candidate reestablishing cell list to perform RRC reestablishment, and selects the target cell in this order until the RRC reestablishment succeeds. If RRC reestablishment performed on all candidate reestablishment cells included in the candidate reestablishment cell list fails, the terminal device may perform RRC reestablishment with any detected cell that satisfies the cell selection S criterion as a target cell.

It should be noted that, the embodiment of the present application does not limit the sequence of each step, and in actual use, some steps may be added or deleted according to needs. For example, the method provided in the embodiment of the present application is also applicable to a scenario where a radio link failure may occur, other than a scenario where a terminal device switches, and for example, a radio link failure occurs between a terminal device and a network device to which a serving cell of the terminal device belongs.

According to the communication method provided by the embodiment of the application, the first network equipment determines candidate reestablishment cell list information and sends the candidate reestablishment cell list information to the terminal equipment; the terminal device may determine a target cell for RRC reestablishment according to the candidate reestablishment cell list information. Compared with the prior art, the communication method provided by the embodiment of the application can reduce the time delay of the RRC reestablishment process, quicken the recovery of the connection between the terminal equipment and the network side, and avoid communication interruption caused by radio link failure or switching failure. Furthermore, since the network devices to which the candidate reestablishing cells belong all acquire the context information of the terminal device in advance, when the terminal device performs RRC reestablishment with the determined target cell, the network device to which the target cell belongs does not need to acquire the context information of the terminal device from the serving base station (the network device to which the serving cell belongs) in the RRC reestablishment process, so that the time delay of the RRC reestablishment process can be reduced, and the recovery of the connection between the terminal device and the network side is accelerated.

The embodiment of the present application provides a communication method, which may be applied to the communication systems shown in fig. 1 to fig. 3, and as shown in fig. 5, the method may include S201 to S203:

s201, the terminal equipment reports a measurement report.

The terminal device receives an RRC reconfiguration message from the first network device, including measurement configuration information. The terminal device measures according to the received measurement configuration information, and when the reporting condition of the measurement report is satisfied, the terminal device reports the measurement report to the first network device, wherein the measurement report includes the cell identifier and the cell signal quality of at least one neighboring cell of the serving cell of the terminal device, and in addition, the measurement report may also include the cell identifier and the cell signal quality of the serving cell.

The method for reporting the measurement report by the terminal device may refer to the description of S10114, which is not described herein again.

S202, the terminal equipment determines a target cell for RRC reestablishment.

And under the conditions of radio link failure or switching failure and the like, the terminal equipment performs RRC reestablishment flow. The terminal device may determine a target cell for RRC re-establishment according to the detected cell signal quality and the measurement report.

Illustratively, the following ways may be included.

The first method is as follows:

the terminal device determines all or part of the cells included in the measurement report as candidate reestablishment cells. Exemplarily, in S201, the measurement report reported by the terminal device includes a cell identifier and a cell signal quality of a cell 4, a cell identifier and a cell signal quality of a cell 5, a cell identifier and a cell signal quality of a cell 6, and a cell identifier and a cell signal quality of a cell 8; the terminal apparatus 200 determines the cell 4, the cell 5, the cell 6, and the cell 8 as candidate re-establishment cells.

It should be noted that, in addition to all or part of the cells included in the measurement report, the terminal device may also determine the serving cell as a candidate re-establishment cell, that is, the candidate re-establishment cell may include all or part of the cells and/or the serving cell included in the measurement report.

In one implementation, in case of radio link failure or handover failure, the terminal device selects any one of at least one candidate re-establishment cell, and detects the cell signal quality of the cell. And the terminal equipment determines whether the cell meets the S criterion of cell selection according to the detected cell signal quality of the cell and the cell selection parameter of the cell. And if the cell meets the S criterion of cell selection, determining the cell to be the target cell of RRC reestablishment. If the cell does not meet the S criterion for cell selection, the terminal equipment randomly selects one of the other candidate reestablished cells except the cell, and judges whether the cell selected this time meets the S criterion for cell selection. And so on until a target cell is selected from the at least one candidate re-establishment cell.

In one implementation, in case of radio link failure or handover failure, the terminal device selects a cell with the best cell signal quality according to the measurement result in step S201, and detects the cell. And the terminal equipment determines whether the cell meets the S criterion of cell selection according to the detected cell signal quality of the cell and the cell selection parameter of the cell. And if the cell meets the S criterion of cell selection, determining the cell to be the target cell of RRC reestablishment. If the cell does not satisfy the S criteria for cell selection, the terminal device selects a cell with the best cell signal quality from the candidate reestablishing cells except for the cell according to the measurement result in step S201, detects the cell, and determines whether the cell selected this time satisfies the S criteria for cell selection according to the detected cell signal quality of the cell and the corresponding cell selection parameters. And the like until the target cell is selected from the candidate reestablishment cells. For example, in S201, the measurement report reported by the terminal device includes measurement information of the cell 4, the cell 5, the cell 6, and the cell 8, where the cell signal quality of the cell 4 is the highest, the cell 5 is the next, the cell 6 is the next, and the cell signal quality of the cell 8 is the lowest. Then, if a radio link failure or a handover failure occurs, the terminal device detects the cell 4, and determines whether the cell 4 meets the S criterion for cell selection according to the current cell signal quality of the cell 4 and the cell selection parameter corresponding to the cell. If cell 4 meets the S criteria for cell selection, cell 4 is determined to be a target cell for RRC reestablishment. If the cell 4 does not meet the S criterion of cell selection, the terminal device detects the cell 5, judges whether the cell 5 meets the S criterion of cell selection according to the current cell signal quality of the cell 5 and the cell selection parameter corresponding to the cell, and so on until a target cell is selected from the candidate reestablished cells.

In one implementation, in case of a radio link failure or a handover failure, the terminal device detects the cell signal quality of each cell in the candidate re-establishment cells, and determines whether the cell satisfies the S criterion for cell selection according to the cell signal quality of each cell and a corresponding cell selection parameter. The terminal device selects one of the cells satisfying the S criterion for cell selection as a target cell. For example, the terminal device may arbitrarily select one of the cells satisfying the S criterion for cell selection as the target cell; the terminal device may also select, as the target cell, one of the cells that satisfies the S criterion for cell selection, where the cell signal quality is the best, and the embodiment is not limited thereto.

The second method comprises the following steps:

under the conditions of radio link failure or switching failure and the like, the terminal equipment performs cell detection, for example, the cell signal quality of a serving cell or a neighboring cell of the serving cell is detected, and the cell signal quality of the detected cell is acquired; if the cell is included in the measurement report reported by the terminal device in step S201, the terminal device determines whether the cell meets the S criterion for cell selection according to the detected cell signal quality of the cell and the cell selection parameter corresponding to the cell. And if the cell meets the S criterion of cell selection, determining the cell to be the target cell of RRC reestablishment. If the cell does not meet the S criterion of cell selection, the terminal equipment continues to detect, and the rest is done by analogy according to the method until the target cell is determined.

For example, in the foregoing various implementation manners, the cell selection parameter corresponding to each cell may be configured by broadcasting in a system message (such as SIB1) by the network device to which each cell belongs, and after the terminal device reads the system message broadcast by the network device to which a certain cell belongs, the terminal device may obtain the cell selection parameter corresponding to the certain cell.

The method for determining, by the terminal device, whether the cell satisfies the S criterion for cell selection according to the cell signal quality and the cell selection parameter may refer to the description of the network device in the first embodiment for determining whether the cell satisfies the S criterion for cell selection, which is not described herein again.

In each of the above implementations, if all cells in the measurement report do not satisfy the S criterion for cell selection, the terminal device may determine any detected cell that satisfies the S criterion for cell selection as a target cell, and perform RRC reestablishment with the target cell.

S203, the terminal device and the target cell perform RRC reestablishment process.

Further, in an implementation manner, according to the protocol, when initiating RRC reestablishment, for example, before sending an RRC re-establishment request message (RRC re-establishment request), the terminal device determines the target cell by using the method described in S202.

Or, in an implementation manner, the terminal device receives first indication information from the first network device, where the first indication information indicates that the terminal device determines the target cell for RRC reestablishment by using the method described in S202. Exemplarily, as shown in step S201, the RRC reconfiguration message that includes the measurement configuration information and is sent by the first network device to the terminal device includes first indication information, and indicates the terminal device to determine the target cell reestablished by RRC in the first manner described in S202, or indicates the terminal device to determine the target cell reestablished by RRC in the second manner described in S202.

Further, after the terminal device reports the measurement report in S201, the first network device receives the measurement report, and may determine to initiate a handover preparation procedure according to the measurement report. As shown in fig. 5, the method may further include S204-S207, where S204-S207 may occur before S202, or occur after S202, or be performed simultaneously with S202, and of course, the method may also include only some steps in S204-S207, for example, S204-S206 is not included, which is not limited in this embodiment. In FIG. 5, S204-S207 are performed before S202 as an example.

S204, the first network equipment determines the target network equipment.

The method for the first network device to determine the destination network device may refer to S10117, which is not described herein again.

S205, the first network device and the target network device perform a switching preparation process.

S10118 may be referred to as a method for performing a handover preparation procedure between the first network device and the destination network device, which is not described herein again.

S206, the first network equipment sends a switching message to the terminal equipment.

The method for the first network device to send the handover message to the terminal device may refer to S10119, which is not described herein again.

S207, the first network device sends the context information of the terminal device to the network devices to which some or all of the cells included in the measurement report belong.

The method for the first network device to send the context information of the terminal device to the network devices to which some or all cells included in the measurement report belong may refer to S1011a, where the method for the first network device to send the context information of the terminal device to the candidate network devices is not described herein again. Unlike S1011a, in S207, the object of the first network device to transmit the context information of the terminal device is a network device to which some or all of the cells in the measurement report belong; in S1011a, the object of the first network device to transmit the context information of the terminal device is a candidate network device.

It should be noted that, the embodiment of the present application does not limit the sequence of each step, and in actual use, some steps may be added or deleted according to needs. For example, the communication method provided in the embodiment of the present application may not include S207.

In the communication method provided by the embodiment of the present application, the terminal device determines the target cell for RRC re-establishment according to the detected cell signal quality and the measurement report. Compared with the prior art, in the communication method provided in the embodiment of the present application, since the network device to which the cell in the measurement report belongs obtains the context information of the terminal device in advance, when the terminal device performs RRC reestablishment with the target cell determined according to the detected cell signal quality and the measurement report, the network device to which the target cell belongs does not need to obtain the context information of the terminal device from the serving base station (the base station to which the serving cell belongs) in the RRC reestablishment process, so that the time delay in the RRC reestablishment process can be reduced, the recovery of the connection between the terminal device and the network side is accelerated, and communication interruption caused by a radio link failure or a handover failure is avoided.

The above-mentioned scheme provided by the embodiment of the present application is introduced mainly from the perspective of interaction between a network device and a terminal device. It is understood that the network device and the terminal device, in order to implement the above functions, include hardware structures and/or software elements corresponding to the respective functions. Those of skill in the art would readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. 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.

In the embodiment of the present application, the network device and the terminal device may be divided into the functional units according to the above method examples, for example, each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one processing unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit. It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation. The following description will be given taking as an example the division of each functional unit into corresponding functions.

Fig. 6 is a schematic structural diagram of an apparatus 600 provided in this embodiment, where the apparatus 600 may be a terminal device and can implement the function of the terminal device in the method provided in this embodiment; the apparatus 600 may also be an apparatus capable of supporting the terminal device to implement the function of the terminal device in the method provided in the embodiment of the present application. The apparatus 600 may be a hardware structure, a software unit, or a hardware structure plus a software unit. The apparatus 600 may be implemented by a system-on-chip. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices. As shown in fig. 6, the apparatus 600 includes a receiving unit 601 and a processing unit 602.

A receiving unit 601, configured to receive a first message, where the first message includes candidate reestablishment cell list information, and the candidate reestablishment cell list information includes information of one or more candidate reestablishment cells.

A processing unit 602, configured to determine, according to the candidate re-establishment cell list information, a target cell for performing radio resource control RRC re-establishment.

In one implementation, the apparatus 600 further includes a transmitting unit 603. A sending unit 603, configured to report a measurement report, where the measurement report includes a cell identifier and a cell signal quality of at least one neighboring cell; the candidate re-establishment cell is one or more of at least one neighbor cell included in the measurement report.

It should be noted that all relevant contents of each step involved in the above method embodiments may be cited in the functional description of the corresponding functional unit, for example, the receiving unit 601 may be at least used for executing S103 in fig. 4, and/or executing other steps described in this application. Processing unit 602 may be used at least to perform S104 in fig. 4, and/or to perform other steps described herein. The sending unit 603 may be at least configured to perform S10114 in fig. 4-1, or configured to perform S10121 in fig. 4-2, and/or perform other steps described in this application, which are not described herein again.

Fig. 7 is a schematic structural diagram of an apparatus 700 provided in this embodiment of the present application, where the apparatus 700 may be a network device and can implement the functions of the network device in the method provided in this embodiment of the present application; the apparatus 700 may also be an apparatus capable of supporting a network device to implement the functions of the network device in the method provided by the embodiment of the present application. The apparatus 700 may be a hardware structure, a software module, or a hardware structure plus a software module. The apparatus 700 may be implemented by a system-on-chip. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices. As shown in fig. 7, the apparatus 700 comprises a processing unit 701 and a transmitting unit 702.

A processing unit 701, configured to generate a first message, where the first message includes candidate reestablishment cell list information, where the candidate reestablishment cell list information is used to determine a target cell for performing radio resource control RRC reestablishment, and the candidate reestablishment cell list information includes information of one or more candidate reestablishment cells.

A sending unit 702, configured to send a first message.

In one implementation, the apparatus 700 further includes a receiving unit 703. A receiving unit 703 is configured to receive the cell selection parameter from at least one second network device, where the second network device is a network device to which a neighboring cell of a serving cell of the terminal device belongs.

The receiving unit 703 is further configured to receive a measurement report from the terminal device, where the measurement report includes a cell identifier of at least one neighboring cell and a corresponding cell signal quality.

The processing unit 701 is further configured to determine candidate reestablishment cell list information according to the cell signal quality and the cell selection parameter of the neighboring cell corresponding to the cell signal quality.

It should be noted that all relevant contents of the steps involved in the above method embodiments may be cited to the functional description of the corresponding functional unit, for example, the processing unit 701 may be at least used for executing S101 in fig. 4, or used for executing S10116 or S10117 or S10118 in fig. 4-1, or used for executing S10123 or S10124 in fig. 4-2, and/or used for executing other steps described in this application. The sending unit 702 may be used at least for performing S102 in fig. 4, or for performing S10119 or S1011a in fig. 4-1, or for performing S10125 or S10126 in fig. 4-2, and/or for performing other steps described in this application. The receiving unit 703 may be configured to perform at least S10113 or S10115 in fig. 4-1, or perform S10122 or S1012a in fig. 4-2, and/or perform other steps described in this application, which are not described herein again.

Fig. 8 is a schematic structural diagram of an apparatus 800 provided in this embodiment of the present application, where the apparatus 800 may be a network device and can implement the functions of the network device in the method provided in this embodiment of the present application; the apparatus 800 may also be an apparatus capable of supporting a network device to implement the functions of the network device in the method provided in the embodiment of the present application. The apparatus 800 may be a hardware structure, a software module, or a hardware structure plus a software module. The apparatus 800 may be implemented by a system-on-chip. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices. As shown in fig. 8, the apparatus 800 includes a processing unit 801 and a transmitting unit 802.

Processing unit 801 is configured to generate a second message, where the second message includes a cell selection parameter, where the cell selection parameter is used for the first network device to determine candidate reestablishment cell list information, and the candidate reestablishment cell list information includes information of one or more candidate reestablishment cells.

A sending unit 802, configured to send a second message to the first network device.

It should be noted that all relevant contents of each step involved in the above method embodiments may be cited to the functional description of the corresponding functional unit, for example, the processing unit 801 may be at least used for executing S10111 or S10118 in fig. 4-1, and/or executing other steps described in this application. The sending unit 802 may be configured to perform at least S10112 in fig. 4-1 and/or perform other steps described in this application, which are not described herein again.

Fig. 9 is a schematic structural diagram of an apparatus 900 provided in this embodiment, where the apparatus 900 may be a network device and can implement the function of the network device in the method provided in this embodiment; the apparatus 900 may also be an apparatus capable of supporting a network device to implement the functions of the network device in the method provided in the embodiment of the present application. The apparatus 900 may be a hardware structure, a software module, or a hardware structure plus a software module. The apparatus 900 may be implemented by a system-on-chip. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices. As shown in fig. 9, the apparatus 900 comprises a receiving unit 901, a processing unit 902 and a transmitting unit 903.

A receiving unit 901, configured to receive a cell identifier of at least one neighboring cell and a corresponding cell signal quality from a first network device.

A processing unit 902, configured to determine reestablishment cell list information according to cell signal quality of at least one neighboring cell and a cell selection parameter of each corresponding neighboring cell, where the reestablishment cell list information includes information of one or more candidate reestablishment cells.

A sending unit 903, configured to send reestablished cell list information to the first network device, where the reestablished cell list information is used to determine a target cell for performing RRC reestablishment.

It should be noted that all relevant contents of the steps involved in the above method embodiments may be cited in the functional description of the corresponding functional unit, for example, the receiving unit 901 may be configured to perform at least S10127 in fig. 4-2 and/or perform other steps described in this application. The processing unit 902 may be used at least to perform S10128 in fig. 4-2, and/or to perform other steps described herein. The sending unit 903 may be configured to perform at least S10129 in fig. 4-2 and/or perform other steps described in this application, which are not described herein again.

Fig. 10 is a schematic structural diagram of an apparatus 1000 provided in the embodiment of the present application, where the apparatus 1000 may be a terminal device and is capable of implementing a function of the terminal device in the method provided in the embodiment of the present application; the apparatus 1000 may also be an apparatus capable of supporting the terminal device to implement the function of the terminal device in the method provided in the embodiment of the present application. The apparatus 1000 may be a hardware structure, a software module, or a hardware structure plus a software module. The apparatus 1000 may be implemented by a system-on-chip. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices. As shown in fig. 10, the apparatus 1000 includes a processing unit 1001 and a transmitting unit 1002.

A processing unit 1001, configured to detect cell signal quality in case of a radio link failure or a handover failure.

The processing unit 1001 is further configured to determine a target cell for performing RRC re-establishment according to the detected cell signal quality and a measurement report, where the measurement report includes a cell identifier and a cell signal quality of at least one neighboring cell of a serving cell of the terminal device.

A sending unit 1002, configured to initiate RRC re-establishment to a target cell.

In one implementation, the apparatus 1000 further includes a receiving unit 1003. A receiving unit 1003, configured to receive first indication information from a network device, where the first indication information is used to instruct a terminal device to determine a target cell for performing RRC re-establishment.

It should be noted that all relevant contents of each step involved in the above method embodiments may be cited in the functional description of the corresponding functional unit, for example, the processing unit 1001 may be at least used for executing S202 or S203 in fig. 5, and/or executing other steps described in this application. The sending unit 1002 may be configured to at least perform S201 in fig. 5 and/or perform other steps described in this application, which are not described herein again.

Fig. 11 is a schematic structural diagram of an apparatus 1100 provided in this embodiment of the present application, where the apparatus 1100 may be a network device and can implement the functions of the network device in the method provided in this embodiment of the present application; the apparatus 1100 may also be an apparatus capable of supporting a network device to implement the functions of the network device in the method provided by the embodiment of the present application. The apparatus 1100 may be a hardware structure, a software module, or a hardware structure plus a software module. The apparatus 1100 may be implemented by a system-on-a-chip. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices. As shown in fig. 11, the apparatus 1100 includes a receiving unit 1101 and a transmitting unit 1102.

A receiving unit 1101, configured to receive a measurement report from a terminal device, where the measurement report includes a cell identifier of at least one neighboring cell and a corresponding cell signal quality.

A sending unit 1102, configured to send context information of the terminal device to a network device to which each neighboring cell included in the at least one neighboring cell belongs.

It should be noted that all relevant contents of each step involved in the above method embodiments may be cited in the functional description of the corresponding functional unit, for example, the receiving unit 1101 may be at least used for executing S204 in fig. 5, and/or executing other steps described in this application. The sending unit 1102 may be configured to at least perform S207 in fig. 5 and/or perform other steps described in this application, which are not described herein again.

In the present embodiment, the apparatus 600, the apparatus 700, the apparatus 800, the apparatus 900, the apparatus 1000, or the apparatus 1100 may be presented in a form of dividing each functional unit in an integrated manner. As used herein, a "unit" may refer to a particular ASIC, a circuit, a processor and memory device that execute one or more software or firmware programs, an integrated logic circuit, and/or other components that provide the described functionality.

In one embodiment, the apparatus 600, 700, 800, 900, 1000 or 1100 may take the form shown in fig. 12.

As shown in fig. 12, the apparatus 1200 may include at least one processor 1201, communication lines 1202, and at least one communication interface 1204, and optionally, memory 1203. The processor 1201, the memory 1203 and the communication interface 1204 may be connected by a communication line 1202.

The processor 1201 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present application, such as: one or more Digital Signal Processors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs).

The communication link 1202 may include a path for communicating information between the aforementioned components.

Communication interface 1204 for communicating with other devices or communication networks may use any transceiver-like device.

The memory 1203 may be a read-only memory (ROM) or other type of static storage device that may store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that may store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to include or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to these. In a possible design, the memory 1203 may exist separately from the processor 1201, that is, the memory 1203 may be a memory external to the processor 1201, in this case, the memory 1203 may be connected to the processor 1201 through the communication line 1202, and is configured to store an execution instruction or an application program code, and the processor 1201 controls the execution of the execution instruction or the application program code, so as to implement the communication method provided by the foregoing embodiment of the present application. In yet another possible design, the memory 1203 may also be integrated with the processor 1201, that is, the memory 1203 may be an internal memory of the processor 1201, and may be used for temporarily storing some data, instruction information, and the like, for example, the memory 1203 is a cache.

As one implementation, the processor 1201 may include one or more CPUs, such as CPU0 and CPU1 in fig. 12. As another implementation, the communications apparatus 1200 may include multiple processors, such as the processor 1201 and the processor 1207 of fig. 12. As yet another implementable manner, the communications apparatus 1200 can further include an output device 1205 and an input device 1206.

It should be noted that the communication apparatus 1200 described above may be a general-purpose device or a special-purpose device. For example, the communication apparatus 1200 may be a desktop computer, a portable computer, a web server, a PDA, a mobile phone, a tablet computer, a wireless terminal, an embedded device, or a device having a similar structure as in fig. 12. The embodiment of the present application does not limit the type of the communication apparatus 1200.

It should be noted that, in a specific implementation process, the apparatus 1200 may also include other hardware devices, which are not listed herein.

In one example of the present application, processing unit 602 in fig. 6, or processing unit 701 in fig. 7, or processing unit 801 in fig. 8, or processing unit 902 in fig. 9, or processing unit 1001 in fig. 10 may be implemented by processor 1201; the receiving unit 601 and the transmitting unit 603 in fig. 6, or the transmitting unit 702 and the receiving unit 703 in fig. 7, or the transmitting unit 802 in fig. 8, or the receiving unit 901 and the transmitting unit 903 in fig. 9, or the transmitting unit 1002 in fig. 10, or the receiving unit 1101 and the transmitting unit 1102 in fig. 11 may be implemented by a communication interface 1204.

Since the apparatus provided in the embodiment of the present application can be used to execute the above communication method, the technical effects obtained by the apparatus can refer to the above method embodiment, and are not described herein again.

It will be apparent to those skilled in the art that all or part of the steps of the above method may be performed by hardware associated with program instructions, and the program may be stored in a computer readable storage medium such as ROM, RAM, optical disk, etc.

The embodiment of the present application also provides a storage medium, which may include the memory 1203.

For the explanation and beneficial effects of the related content in any one of the above-mentioned apparatuses, reference may be made to the corresponding method embodiments provided above, and details are not repeated here.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented using a software program, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions described in accordance with the embodiments of the present application are all or partially generated upon loading and execution of computer program instructions on a computer. The computer may be a general purpose computer, a special purpose computer, a computer network, a network appliance, a user device, or other programmable apparatus. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or can comprise one or more data storage devices, such as a server, a data center, etc., that can be integrated with the medium. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., Digital Video Disk (DVD)), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

While the present application has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Although the present application has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the application. Accordingly, the specification and figures are merely exemplary of the present application as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the present application. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A method of communication, comprising:

the method comprises the steps that terminal equipment receives a first message, wherein the first message comprises candidate reestablishment cell list information, and the candidate reestablishment cell list information comprises information of one or more candidate reestablishment cells;

and the terminal equipment determines a target cell for Radio Resource Control (RRC) reestablishment according to the candidate reestablishment cell list information.

2. The method of claim 1, further comprising:

the terminal equipment reports a measurement report, wherein the measurement report comprises a cell identifier and cell signal quality of at least one adjacent cell;

the candidate reestablishing cells are one or more of at least one adjacent cell included in the measurement report.

3. The method of claim 1 or 2, wherein the candidate re-establishment cells are prioritized,

the terminal equipment determines a target cell for RRC reestablishment according to the candidate reestablishment cell list information, and the method comprises the following steps:

and the terminal equipment selects one of the one or more candidate reestablishing cells as a target cell according to the priorities of the one or more candidate reestablishing cells and the priority from high to low.

4. The method of claim 3, wherein the candidate re-establishment cell list information comprises priority indication information for the one or more candidate re-establishment cells,

and the terminal equipment selects one cell of the one or more candidate reestablishing cells as a target cell according to the priority indication information of the one or more candidate reestablishing cells and the sequence from high priority to low priority.

5. A method of communication, comprising:

under the condition that radio link failure or switching failure occurs, the terminal equipment detects the signal quality of a cell;

the terminal equipment determines a target cell for Radio Resource Control (RRC) reestablishment according to the detected cell signal quality and the measurement report; the measurement report comprises a cell identification and a cell signal quality of at least one adjacent cell of a service cell of the terminal equipment;

and the terminal equipment initiates RRC reestablishment to the target cell.

6. The method of claim 5, further comprising:

the terminal equipment receives first indication information from network equipment, wherein the first indication information is used for indicating the terminal equipment to determine a target cell for RRC reestablishment.

7. The method according to any of claims 1-6, wherein the target cell is a cell satisfying S-criteria for cell selection.

8. A method of communication, comprising:

the method comprises the steps that first network equipment generates a first message, wherein the first message comprises candidate reestablishment cell list information, the candidate reestablishment cell list information is used for determining a target cell for Radio Resource Control (RRC) reestablishment, and the candidate reestablishment cell list information comprises information of one or more candidate reestablishment cells;

and the first network equipment sends the first message to terminal equipment.

9. The method of claim 8, wherein before the first network device sends the first message to a terminal device, the method further comprises:

the first network equipment receives cell selection parameters from at least one second network equipment, wherein the second network equipment is the network equipment to which the adjacent cell of the service cell of the terminal equipment belongs;

the first network equipment receives a measurement report from the terminal equipment, wherein the measurement report comprises a cell identifier of at least one adjacent cell and corresponding cell signal quality;

and the first network equipment determines the candidate reestablishment cell list information according to the cell signal quality and the cell selection parameter of the adjacent cell corresponding to the cell signal quality.

10. The method of claim 9, further comprising:

and the first network equipment respectively sends the context information of the terminal equipment to second network equipment to which the one or more candidate reestablishing cells respectively belong.

11. The method of claim 8, wherein before the first network device sends the first message to a terminal device, the method further comprises:

the first network equipment receives reestablished cell list information of third network equipment from at least one third network equipment respectively, wherein each reestablished cell list information comprises information of one or more candidate reestablished cells in the corresponding third network equipment;

the first network device determines the candidate reestablished cell list information according to reestablished cell list information of the at least one third network device.

12. The method of claim 11, further comprising:

the first network equipment receives a measurement report from terminal equipment, wherein the measurement report comprises a cell identifier of at least one adjacent cell and corresponding cell signal quality;

the first network device sends corresponding cell signal quality to a fourth network device according to the measurement report, wherein the fourth network device is a network device corresponding to the at least one neighboring cell and comprises one or more network devices;

wherein the third network device is one or more of the fourth network devices.

13. The method of claim 12, further comprising:

and the first network equipment sends the context information of the terminal equipment to the fourth network equipment.

14. A method of communication, comprising:

the network equipment generates a second message, wherein the second message comprises a cell selection parameter, the cell selection parameter is used for the first network equipment to determine candidate reestablishment cell list information, and the candidate reestablishment cell list information comprises information of one or more candidate reestablishment cells;

the network device sends the second message to the first network device.

15. The method of any of claims 8-14, wherein the candidate re-establishment cells are prioritized.

16. The method of claim 15, wherein the candidate re-establishment cell list information comprises priority indication information of the one or more candidate re-establishment cells, and wherein the priority indication information is used for indicating a priority of a cell as a target cell for RRC re-establishment.

17. A method of communication, comprising:

the network equipment receives a cell identification of at least one adjacent cell and corresponding cell signal quality from first network equipment;

the network equipment determines reestablished cell list information according to the cell signal quality of the at least one adjacent cell and cell selection parameters of each corresponding adjacent cell, wherein the reestablished cell list information comprises information of one or more candidate reestablished cells;

and the network equipment sends the reestablished cell list information to the first network equipment, wherein the reestablished cell list information is used for determining a target cell for Radio Resource Control (RRC) reestablishment.

18. The method of any of claims 8-17, wherein the candidate re-establishment cell is a cell that satisfies S-criteria for cell selection.

19. A communication apparatus, characterized in that the communication apparatus is configured to perform the communication method according to any one of claims 1-7 or the communication method according to any one of claims 8-18.

20. A computer program product, comprising: at least one processor, and a memory; it is characterized in that the preparation method is characterized in that,

the memory is for storing a computer program such that the computer program when executed by the at least one processor implements the communication method of any one of claims 1-7 or the communication method of any one of claims 8-18.

21. A computer storage medium on which a computer program is stored, which program, when executed by a processor, carries out a communication method according to any one of claims 1 to 7 or a communication method according to any one of claims 8 to 18.