WO2022036635A1

WO2022036635A1 - Communication method and apparatus

Info

Publication number: WO2022036635A1
Application number: PCT/CN2020/110261
Authority: WO
Inventors: 孙慧明; 耿婷婷; 曾清海; 李秉肇
Original assignee: 华为技术有限公司
Priority date: 2020-08-20
Filing date: 2020-08-20
Publication date: 2022-02-24
Also published as: CN115885542A

Abstract

Disclosed are a communication method and apparatus, capable of reducing the handover delay of NG interface-based cell handover, and increasing the handover success rate. The method comprises: a target access network device receives a handover request message from a core network device, the handover request message being used for requesting to hand over a terminal device to a first cell of the target access network device; the target access network device determines that the terminal device satisfies at least one of the following conditions: a subcarrier spacing supported by the terminal device is different from a subcarrier spacing of the first cell, and a channel bandwidth supported by the terminal device is greater than a carrier bandwidth of the first cell; the target access network device sends a handover failure message to the core network device, the handover failure message being used for indicating that the target access network device refuses the handover request message; the handover failure message carrying cell information; the cell information comprising a carrier configuration of the first cell; the carrier configuration comprising at least one of the following information: the subcarrier spacing and the carrier bandwidth.

Description

A communication method and device

technical field

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

Background technique

At present, in the cell handover process based on the NG interface, the source base station sends a handover request (Handover Required) message to the access and mobility management function (AMF) entity when it decides the cell handover, and the message can carry the user Device (user equipment, UE) capabilities, UE capabilities include subcarrier spacing (subcarrier spacing, SCS) and channel bandwidth (channel bandwidth) supported by the UE. The AMF entity sends a handover request (Handover Request) message to the target base station, where the message carries the UE capability. The target base station performs handover admission judgment according to the UE capability and the SCS/carrier bandwidth information of the target cell sent by the source base station. If it is found that the UE does not support the SCS/carrier bandwidth of the target cell, the handover request is rejected. It can be seen that in the existing cell handover process based on the NG interface, the handover delay is relatively large, and the risk of handover failure is relatively high.

SUMMARY OF THE INVENTION

The present application provides a communication method and device, which can reduce the handover delay of cell handover based on the NG interface and improve the handover success rate.

In a first aspect, the present application provides a communication method, which can be applied to a communication system in which an access network device communicates based on an NG interface, the method comprising: a target access network device receiving a handover request message from a core network device, The handover request message is used to request handover of the terminal device to the first cell of the target access network device. The target access network device determines that the terminal device meets at least one of the following conditions: the subcarrier interval supported by the terminal device is different from the subcarrier interval of the first cell, and the channel bandwidth supported by the terminal device is greater than the carrier bandwidth of the first cell; The network device sends a handover failure message to the core network device. The handover failure message is used to instruct the target access network device to reject the handover request message, and the handover failure message carries cell information. The cell information includes the carrier configuration of the first cell. The carrier configuration is in the following information At least one item: subcarrier spacing, carrier bandwidth.

Through the method provided by the embodiment of the present application, the source access network device can obtain the carrier configuration of each cell under the target access network device, so that in the subsequent cell handover process, the source access network device can determine that the terminal device supports the target cell when selecting the target cell. Whether the SCS/channel bandwidth capability of the target cell supports the carrier configuration of the target cell, so as to avoid selecting a cell that is not supported by the terminal device as the target cell. Carrier configuration, the embodiment of the present application can reduce the handover delay, and can improve the handover success rate.

In a possible design, the cell information further includes carrier configuration of at least one second cell of the target access network device. In the above design, the carrier configuration of other cells of the target access network device is sent to the source access network device.

In a possible design, the cell information is carried in a container of the handover failure message. Through the above design, the core network device can transparently transmit the cell information to the target access network device.

In a possible design, the cell information further includes a cell identity of the first cell. Through the above design, the source access network device can determine the correspondence between the cell and the carrier configuration, thereby improving the accuracy of the cell handover.

In a possible design, the cell identifier may be a cell global identification (CGI), or a physical cell identifier (PCI), or a cell ID (cell ID).

In a second aspect, the present application provides a communication method, which can be applied to a communication system in which an access network device communicates based on an NG interface. The method includes: a source access network device sends a handover request message to a core network device, The handover request message is used to request the terminal device to be handed over to the first cell of the target access network device; the source access network device receives the handover preparation failure message from the core network device, and the handover preparation failure message is used to notify the source access network device of handover preparation Failed, and the handover failure message carries cell information, the cell information includes the carrier configuration of the first cell, and the carrier configuration includes at least one of the following information: subcarrier spacing, carrier bandwidth; source access network equipment determines the target cell according to the cell information.

In a possible design, the cell information is carried in the container of the handover failure message. Through the above design, the core network device can transparently transmit the cell information to the target access network device.

In a possible design, the cell identifier may be CGI, or PCI, or cell ID.

In a third aspect, the present application provides a communication method, which can be applied to a communication system in which an access network device communicates based on an NG interface. The method includes: the first access network device uses an access and mobility management function The core network device receives first information from the second access network device, where the first information includes a carrier configuration of at least one cell of the second access network device, and the carrier configuration includes at least one of the following information: subcarrier spacing, carrier bandwidth; The first access network device determines the target cell according to the first information.

With the method provided by the embodiment of the present application, the carrier configuration of at least one cell of itself is sent to the first access network device through the second access network device, so that the first access network device selects the target cell in the subsequent cell handover process. It can judge whether the SCS/channel bandwidth capability supported by the terminal equipment supports the carrier configuration of the target cell, so as to avoid selecting a cell that is not supported by the terminal equipment as the target cell. Whether the device supports the carrier configuration of the target cell, the embodiments of the present application can reduce the handover delay and improve the handover success rate.

In a possible design, the first access network device sends second information to the second access network device through the core network device, where the second information includes a carrier configuration of at least one cell of the first access network device. In the above design, the first access network device sends the carrier configuration of at least one cell of its own to the second access network device, so that the second access network device can determine the SCS/channel bandwidth supported by the terminal device when selecting the target cell. Whether the capability supports the carrier configuration of the target cell, so as to avoid selecting a cell that is not supported by the terminal device as the target cell.

In a possible design, before the first access network device sends the second information to the second access network device through the core network device, the first access network device sends a handover request message to the core network device, and the handover request message uses In order to request the handover of the terminal device to the first cell of the second access network device; the first access network device receives a handover preparation failure message from the core network device, and the handover preparation failure message is used to instruct the second access network device to reject the handover request message, and the handover failure message carries the failure reason, and the failure reason includes that the terminal device does not meet at least one of the following conditions: the subcarrier interval supported by the terminal device is different from the subcarrier interval of the first cell, and the channel bandwidth supported by the terminal device is greater than the first cell. The carrier bandwidth of the cell. The above design can trigger the first access network device to send the carrier configuration of at least one cell to the second access network device through the failure cause value used to indicate that the terminal device does not support the carrier configuration of the target cell.

In a possible design, when the first access network device sends the second information to the second access network device through the core network device, it may send a handover request message to the core network device, and the handover request message is used to request the terminal device to be handed over. to the second cell of the second access network device, and the handover request message carries the second information. In the above design, the first access network device carries the carrier configuration of at least one cell of the first access network device in the handover request message, so that the protocol changes are small.

In a possible design, the first access network device receives the first information from the second access network device through the access and mobility management function core network device, including: the first access network device receives handover from the core network device The command message, where the handover command message carries the first information. In the above design, the second access network device carries the carrier configuration of at least one cell of the second access network device in the handover command message, so that the protocol changes are small.

In a possible design, before the first access network device sends the second information to the second access network device through the core network device, a handover request message may be received from the core network device, and the handover request message is used to request the terminal device Handover to the third cell of the first access network device; the first access network device determines that the terminal device meets at least one of the following conditions: the subcarrier interval supported by the terminal device is different from the subcarrier interval of the third cell, and the terminal device supports The channel bandwidth is greater than the carrier bandwidth of the third cell. In the above design, the first access network device may trigger sending the carrier configuration of at least one cell of the terminal device to the second access network device when the terminal device does not support the carrier configuration of the target cell.

In a possible design, the first access network device receives the first information from the second access network device through the access and mobility management function core network device, including: the first access network device receives handover from the core network device The handover request message is used for requesting handover of the terminal device to the fourth cell of the first access network device, and the handover request message carries the first information. In the above design, the second access network device carries the carrier configuration of at least one cell of the second access network device in the handover request message, so that the protocol changes are small.

In a possible design, when the first access network device sends the second information to the second access network device through the core network device, it may send a handover request response message to the core network device, and the handover request response message carries the second information. In the above design, the first access network device carries the carrier configuration of at least one cell of the first access network device in the handover request message, so that the protocol changes are small.

In a fourth aspect, an embodiment of the present application provides a communication device, which may be a communication device or a chip in the communication device, where the communication device may be an access network device, such as a first access network device, a first access network device, a third 2. Access network equipment, source access network equipment, and target access network equipment. The apparatus may include a processing unit, a transceiving unit and a receiving unit. It should be understood that, the sending unit and the receiving unit here may also be transceiver units. When the apparatus is a communication device, the processing unit may be a processor, and the transmitting unit and the receiving unit may be transceivers; the communication device may further include a storage unit, which may be a memory; the storage unit is used for storing instructions , the processing unit executes the instructions stored in the storage unit, so that the access network device executes the method described in any one of the first aspect to the third aspect. When the device is a chip in a communication device, the processing unit may be a processor, the sending unit and the receiving unit may be an input/output interface, a pin or a circuit, etc.; the processing unit executes the instructions stored in the storage unit to The chip is made to perform the method described in any one of the first aspect to the third aspect. The storage unit is used to store instructions, and the storage unit may be a storage unit in the chip (for example, a register, a cache, etc.), or a storage unit in the terminal device located outside the chip (for example, a read-only memory, random access memory, etc.).

In a fifth aspect, an embodiment of the present application provides a communication system, which may include the target access network device and the target access network device mentioned in the first aspect above.

A sixth aspect, a computer-readable storage medium provided by the embodiments of the present application, the computer-readable storage medium stores program instructions, when the program instructions are run on a computer, the computer is made to execute any of the first to third aspects. The method described in one aspect. Illustratively, a computer-readable storage medium can be any available medium that can be accessed by a computer. Taking this as an example but not limited to: computer readable media may include non-transitory computer readable media, random-access memory (RAM), read-only memory (ROM), electrically erasable Except programmable read only memory (electrically EPROM, EEPROM), CD-ROM or other optical disk storage, magnetic disk storage medium or other magnetic storage device, or capable of carrying or storing desired program code in the form of instructions or data structures and capable of Any other media accessed by a computer.

In a seventh aspect, the embodiments of the present application provide a computer program product including computer program codes or instructions, which, when run on a computer, enable the computer to implement the method described in any one of the first to third aspects.

In an eighth aspect, the present application further provides a chip, which is coupled to a memory and configured to read and execute program instructions stored in the memory, so as to implement any one of the above-mentioned first to third aspects. Methods.

Please refer to the above description of the technical effects that can be achieved by various possible solutions in the first aspect to the third aspect, and will not be repeated here.

Description of drawings

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

2 is a schematic diagram of a cell handover process based on an XN interface provided by an embodiment of the present application;

3 is a schematic flowchart of establishing an XN interface according to an embodiment of the present application;

4 is another schematic flowchart of establishing an XN interface according to an embodiment of the present application;

5 is a schematic diagram of a cell handover process based on an NG interface according to an embodiment of the present application;

6 is a schematic flowchart of a communication method provided by an embodiment of the present application;

7 is a schematic diagram of a cell handover process based on an NG interface according to an embodiment of the present application;

FIG. 8 is a schematic flowchart of a communication method provided by an embodiment of the present application;

FIG. 9 is a schematic flowchart of carrier configuration of a cell that a first access network device and a second access network device interact with according to an embodiment of the present application;

FIG. 10 is a schematic flowchart of another carrier configuration of an interactive cell between a first access network device and a second access network device according to an embodiment of the present application;

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

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

FIG. 13 is a schematic structural diagram of an access network device according to an embodiment of the present application.

detailed description

In order to make the objectives, technical solutions and advantages of the embodiments of the present application more clear, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

The communication method provided in this embodiment of the present application may be applied to the communication system shown in FIG. 1 , where the communication system may include a core network device, a first access network device, a second access network device, and a terminal device, wherein the terminal device The first access network device is accessed, and the first access network device and the second access network device can communicate through the core network device. It should be understood that FIG. 1 is only an exemplary illustration, and does not specifically limit the number of terminal devices, access network devices, and core network devices included in the communication system.

The communication method provided in this application can be applied to various communication systems, for example, it can be an internet of things (IoT) system, a narrow band internet of things (NB-IoT) system, an LTE system, or It may be a fifth-generation (5G) communication system, such as a new radio (NR) system, or a hybrid architecture of LTE and 5G, and a new communication system emerging in future communication development.

The terminal equipment involved in the embodiments of this application is an entity on the user side that is used to receive or transmit signals. A terminal device may be a device that provides voice and/or data connectivity to a user, eg, a handheld device with a wireless connection function, a vehicle-mounted device, and the like. The terminal device may also be other processing device connected to the wireless modem. Terminal devices can communicate with a radio access network (RAN). Terminal equipment may also be referred to as wireless terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, access point , remote terminal (remote terminal), access terminal (access terminal), user terminal (user terminal), user agent (user agent), user equipment (user device), or user equipment (user equipment, UE) and so on. Terminal devices may be mobile terminals, such as mobile phones (or "cellular" phones) and computers with mobile terminals, for example, may be portable, pocket-sized, hand-held, computer-built, or vehicle-mounted mobile devices, which are associated with wireless The access network exchanges language and/or data. For example, the terminal device may also be a personal communication service (PCS) phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (personal digital assistant, PDA), and other equipment. Common terminal devices include, for example: mobile phones, tablet computers, notebook computers, PDAs, mobile internet devices (MIDs), wearable devices, such as smart watches, smart bracelets, pedometers, etc. The example is not limited to this.

The access network device involved in the embodiments of this application is an entity on the network side that is used to transmit or receive signals. For example, the network device may be an evolved Node B (evolved Node B, eNB or e-NodeB) in LTE, a new radio controller (NR controller), or a gNode B (gNB) in the 5G system. ), can be a centralized unit, can be a new wireless base station, can be a remote radio module, can be a micro base station, can be a relay, can be a distributed unit, It may be a transmission reception point (transmission reception point, TRP) or a transmission point (transmission point, TP) or any other wireless access device, but the embodiment of the present application is not limited thereto. A network device can cover one or more cells.

The network architecture and service scenarios described in the embodiments of the present application are for the purpose of illustrating the technical solutions of the embodiments of the present application more clearly, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. The evolution of the architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

The core network device involved in the embodiments of this application may be a network element that provides mobility management for terminal devices. For example, the core network device may be a mobility management entity (mobility management entity, MME), or an access and mobility management entity. Function (access and mobility management function, AMF) network element, etc.

When a terminal device initially accesses a cell, the terminal device needs to verify the subcarrier spacing (SCS) and channel bandwidth (channel bandwidth) it supports, that is, the terminal device will be able to use the channel bandwidth capability (channel bandwidth capability) it supports. A candidate cell can be accessed only when the bandwidth of the initial bandwidth part (BWP) is greater than or equal to the initial BWP bandwidth and less than or equal to the carrier bandwidth (carrierBandwidth indicated in SIB1) associated with the SCS of the candidate cell. The carrier bandwidth associated with the SCS is broadcast by the candidate cell through system information block 1 (SIB1). That is, when the terminal device accesses the initial cell, it needs to satisfy the Initial(UL/DL)BWP bandwidth≤UE(UL/DL)channel bandwidth capability≤(UL/DL)carrierBandwidth indicated in SIB1. When this condition is not met, The terminal device regards the cell as a barred cell.

For example, assuming that the terminal device supports bandwidths of 100, 80, 40, and 20 MHz, if the carrier bandwidth broadcast in the SIB1 of the cell is 90 MHz, and the bandwidth of the initial BWP is 70 MHz, the UE should use the 80 MHz bandwidth for initial access.

Similarly, during handover, the source access network device will also make a handover decision based on the subcarrier spacing/channel bandwidth capability supported by the terminal device and the SCS/carrierBandwidth of the target cell. Therefore, the SCS and carrier bandwidth of the target cell are It is very necessary for the source cell to make a handover decision.

According to whether there is an interface between the source base station and the target base station, cell handover can be divided into cell handover based on the interface between base stations and cell handover based on the interface between the base station and the core network. The interface between the base stations can be an XN interface, and the interface between the base station and the core network can be an NG interface, an N2 interface, etc. For the convenience of description, the following description will take the interface between the base station and the core network as an NG interface as an example. This embodiment of the present application does not specifically limit the naming of the interface between the base station and the core network device.

For example, in the 5G system, according to whether there is an XN interface between the source base station and the target base station, cell handover can be divided into cell handover based on XN interface and cell handover based on NG interface (also called cell handover based on N2 interface). ).

The process of cell handover based on the XN interface can be shown in Figure 2:

S201, the source access network device sends a radio resource control (radio resource control, RRC) reconfiguration message to the terminal device.

The RRC reconfiguration message may include parameters such as measurement objects, report configurations, and measurement identifiers.

S202, the terminal device measures at least one cell according to the RRC reconfiguration message.

S203, the terminal device reports a measurement report to the source access network device.

The measurement report may include various reporting events, such as the signal strength of the current serving cell is lower than the threshold and the signal of the target cell is higher than the threshold.

S204, the source access network device makes a measurement decision according to the measurement report.

In an implementation manner, the source access network device determines whether the terminal device performs cell handover according to the measurement report. Among them, the SCS and carrier bandwidth of each cell is a key for the source access network device to determine whether the terminal device performs cell handover. If the source access network device decides that the terminal device performs cell handover, the SCS of the target cell is the same as that of the terminal device, and the carrier bandwidth of the target cell must be greater than or equal to the channel bandwidth capability of the terminal device.

S205, the source access network device sends a handover request message to the target access network device.

S206, the target access network device decides to allow the access of the terminal device according to the number of its own connections and the like.

S207, the target access network device sends a handover confirmation message to the source access network device, which may include a new cell radio network temporary identifier (cell radio network temporary identifier, C-RNTI), security-related parameters of the target access network device, and the like.

S208, the source access network device sends an RRC reconfiguration message to the terminal device.

The RRC reconfiguration message may include the handover confirmation message of S207. The RRC reconfiguration message may carry a handover command, and the handover command may include relevant information of the target cell and relevant configuration parameters required by the terminal device to access the target cell, for example, information of the target cell (for example, the physical cell identifier of the target cell). cell identifier, PCI) and the frequency information corresponding to the target cell), the C-RNTI allocated by the target cell to the terminal device, and the random access channel (random access channel, RACH) resource information required to access the target cell (such as dedicated RACH resources) and/or public RACH resources) etc.

S209, the terminal device initiates random access to the target access network device according to the handover command.

S210, the terminal device sends an RRC reconfiguration complete message to the target access network device.

S211, the target access network device sends a context release message to the source access network device to instruct the source access network device to release the context of the terminal device.

Currently, the SCS/carrier bandwidth of the cell of the target access network device is sent to the source access network device when the source access network device and the target access network device establish an XN interface. The process of establishing the XN interface between the source access network device and the target access network device may be as shown in FIG. 3 or FIG. 4 . The XN setup response message may carry the SCS/carrier bandwidth of the cell of the target access network device.

In the cell handover based on the NG interface, since there is no XN interface between the source access network device and the target access network device, the source access network device cannot know the SCS/carrier bandwidth of the cell under the target access network device.

The cell handover based on the NG interface can be shown in Figure 5:

S501, a source access network device selects a target cell.

S502, the source access network device sends a handover request (Handover Required) message to the AMF, where the message includes the identifier of the target access network device to be handed over and the container (Source to Target) sent by the source access network device to the target access network device transparent container, the container contains the CGI information of the target cell), the container will be transparently forwarded by the AMF to the target access network device, that is, the AMF will not perceive it.

S503, the AMF sends a handover request (Handover Request) message to the target access network device, where the message carries the above container.

The container sent by the source access network device in step S502 carries the UE capability information, that is, carries the SCS/channel bandwidth capability of the terminal device, so that after the target access network device receives the container, it will carry the UE capability information according to the SCS/channel bandwidth supported by the terminal device. The capability and the SCS/carrier bandwidth of the target cell determine whether to allow the terminal device to access the target cell. If the SCS of the target cell is the same as the SCS of the terminal device, and the carrier bandwidth of the target cell must be greater than or equal to the channel bandwidth capability of the terminal device, then The terminal device is allowed to access the target cell, and the target access network device sends a Handover Request Acknowledge message to the AMF. Otherwise, the terminal device is not allowed to access the target cell, and the target access network device sends a handover failure response message to the AMF.

S504, the target access network device sends a handover request response (Handover Request Acknowledge) message to the AMF, where the message includes a container that carries a handover command (HandoverCommand) message, and the container is generated by the target access network device.

S505, the AMF sends a Handover Command message to the source access network device, where the message is used to confirm that the target access network device side has prepared handover resources.

S506, the source access network device sends an RRC reconfiguration message to the terminal device, where the RRC reconfiguration message carries the handover command (HandoverCommand) of step S504.

S507, the terminal device initiates random access to the target cell.

S508, the terminal device sends a handover confirmation message to the target access network device.

S509, the target access network device sends a handover notification (Handover Notify) message to the AMF, where the handover notification message is used to notify the AMF that the handover is successfully completed.

S510, the AMF sends a UE context release command to the source access network device.

S511, the source access network device sends the UE context release complete to the AMF.

According to the above process, the target access network device may reject the handover request when preparing for handover because the terminal device does not support the subcarrier spacing/carrier bandwidth of the target cell, resulting in failure of the handover preparation process. In this case, the source access network device needs to switch the terminal device again, resulting in a large switching delay.

Based on this, the embodiments of the present application provide a communication method and apparatus, which can reduce the handover delay of cell handover based on the interface between the base station and the core network (eg, the NG interface), and improve the handover success rate. Among them, the method and the device are based on the same inventive concept. Since the principles of the method and the device for solving the problem are similar, the implementation of the device and the method can be referred to each other, and the repetition will not be repeated.

It should be understood that, in the embodiments of the present application, "at least one" refers to one or more, and "a plurality" refers to two or more. "And/or", which describes the association relationship of the associated objects, means that there can be three kinds of relationships, for example, A and/or B, it can mean that A exists alone, A and B exist at the same time, and B exists alone, where A, B can be singular or plural. The character "/" generally indicates that the associated objects are an "or" relationship. "At least one (item) of the following" or its similar expression refers to any combination of these items, including any combination of single item (item) or plural item (item). For example, at least one (a) of a, b or c may represent: a, b, c, a and b, a and c, b and c, or a, b and c, where a, b, c Can be single or multiple.

It should be understood that the terminology used in the present application is for the purpose of describing particular embodiments only, and is not intended to limit the present application. As used in this application and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise.

Additionally, although the terms first, second, third, etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information without departing from the scope of the present application. Depending on the context, the word "if" as used herein can be interpreted as "at the time of" or "when" or "in response to determining."

As shown in FIG. 6 , a communication method provided by an embodiment of the present application can be applied to a scenario where an access network device communicates based on an NG interface, and the method may specifically include:

S601: The source access network device sends a handover request message to the core network device, where the handover request message is used to request handover of the terminal device to the first cell of the target access network device. Correspondingly, the core network device receives the handover request message sent by the source access network device.

The core network device may be a network element that provides mobility management for the terminal device, for example, an MME, or an AMF network element.

Exemplarily, the handover request message may include a first container (container), and the first container may include some information required for cell handover, such as the cell identity of the target cell, the UE capability information of the terminal device, etc., the UE of the terminal device. The capability information may include the SCS supported by the terminal device, the channel bandwidth capability of the terminal device, and the like.

It can be understood that the first container may include one container, or may include multiple containers, which is not specifically limited here.

S602: The core network device sends a handover request message to the target access network device, where the handover request message is used to request handover of the terminal device to the first cell of the target access network device. Correspondingly, the target access network device receives the handover request message sent by the core network device.

In some embodiments, the handover request message sent by the core network device to the target access network device may include the above-mentioned first container.

S603, the target access network device determines that the terminal device does not support the carrier configuration of the first cell, and the carrier configuration of the first cell at least one of the following configurations: the SCS of the first cell and the carrier bandwidth of the first cell.

In an exemplary illustration, if the terminal device does not support the carrier configuration of the first cell, it can be understood that the terminal device meets at least one of the following conditions: the SCS supported by the terminal device is different from that of the first cell, and the channel bandwidth supported by the terminal device is different. greater than the carrier bandwidth of the first cell.

Conversely, if the terminal equipment supports the carrier configuration of the first cell, it can be understood that the SCS supported by the terminal equipment is the same as the SCS of the first cell, or it can also be understood that the channel bandwidth supported by the terminal equipment is less than or equal to the carrier bandwidth of the first cell, Alternatively, it can also be understood that the SCS supported by the terminal device is the same as the SCS of the first cell, and the channel bandwidth supported by the terminal device is less than or equal to the carrier bandwidth of the first cell.

In an implementation manner, the target access network device may determine whether the SCS supported by the terminal device is the same as the SCS of the first cell. If the SCS supported by the terminal device is different from the SCS of the first cell, the target access network device may determine that the terminal device does not support the carrier configuration of the first cell.

If the SCS supported by the terminal device is the same as the SCS of the first cell, the target access network device can also determine whether the channel bandwidth supported by the terminal device is less than or equal to the carrier bandwidth of the first cell. If the channel bandwidth supported by the terminal device is less than or equal to the carrier bandwidth of the first cell, the target access network device may determine that the terminal device supports the carrier configuration of the first cell.

The channel bandwidth supported by the terminal device may be understood as the channel bandwidth capability of the terminal device, and may also be understood as the maximum channel bandwidth supported by the terminal device.

S604, the target access network device sends a handover failure message to the core network device, where the handover failure message is used to instruct the target access network device to reject the handover request message, and the handover failure message carries cell information, and the cell information includes the carrier configuration of the first cell, The carrier is configured with at least one item of the following information: SCS, carrier bandwidth. Correspondingly, the core network device receives the handover failure message sent by the target access network device.

Exemplarily, the handover failure message may also be used to indicate that the target access network device fails to prepare for handover, or the handover failure message may also be used to indicate that the target access network device fails to prepare to handover resources, and so on.

The cell information may also include a cell identity of the first cell. Exemplarily, the cell identifier may be, but not limited to, a global cell identifier (cell global identifier, CGI), a physical cell identifier (physical cell identifier, PCI), and a cell identifier (cell ID).

In an implementation manner, the format of the cell information may be the cell identifier of the first cell and the corresponding carrier configuration.

Optionally, the cell information may further include carrier configurations of other cells of the target access network device, for example, carrier configurations of at least one second cell of the target access network device.

In an implementation manner, the format of the cell information may be a list including a cell identifier and a carrier configuration corresponding to the cell identifier.

In an exemplary illustration, whether the target access network device carries the cell information in the handover failure message is determined according to whether the terminal device supports the carrier configuration of the first cell.

Optionally, the handover failure message may include a second container, and the second container may include the above cell information.

It can be understood that the second container may include one container, or may include multiple containers, which is not specifically limited here.

S605, the core network device sends a handover preparation failure message to the source access network device, where the handover preparation failure message is used to notify the source access network device that the handover preparation fails, and the handover failure message carries cell information, and the cell information includes the carrier of the first cell The carrier configuration includes at least one of the following information: subcarrier spacing and carrier bandwidth. Correspondingly, the source access network device receives the handover preparation failure message sent by the core network device.

In some embodiments, the handover request message sent by the core network device to the target access network device may include the above-mentioned second container.

S606, the source access network device determines the target cell according to the cell information.

It can be understood that after receiving the cell information from the target access network device, the source access network device may re-determine the target cell according to the cell information, wherein the target cell determined by the source access network device according to the cell information may still be the first cell. For a cell, it can also be understood that the source access network device can reselect to the first cell according to the cell information. Alternatively, the target cell determined by the source access network device according to the cell information may also be another cell.

In order to better understand the communication method provided by the embodiment of the present application, on the basis of the communication method shown in FIG. 6 , a detailed description is given below in conjunction with the cell handover process based on the NG interface.

As shown in Figure 7, the cell handover process based on the NG interface includes, it should be understood that Figure 7 only takes the core network device as an AMF as an example for description, and does not limit the type of the core network device:

S701, the source access network device sends a handover request (Handover Required) message to the AMF, where the Handover Required message is used to request that the terminal device be handed over to the first cell of the target access network device.

The Handover Required message may include the identifier of the target access network device and the first container (Source to Target transparent container) sent by the source access network device to the target access network device, and the AMF transparently forwards the first container to the target access network device. The target access network device.

Optionally, the first container may contain a cell identifier (eg, CGI, etc.) of the target cell.

The first container may further include UE capability information of the terminal device, and the UE capability information may include at least one item of the following information: SCS supported by the terminal device and channel bandwidth capability supported by the terminal device.

S702, the AMF entity sends a handover request (Handover Request) message to the target access network device, where the Handover Request message is used to request that the terminal device be handed over to the first cell of the target access network device.

Optionally, the Handover Request message may include the above-mentioned first container.

S703, the target access network device determines whether the terminal device supports the carrier configuration of the first cell. If yes, go to steps S704-711; if not, go to step S712.

Wherein, for the method for the target access network device to determine whether the terminal device supports the carrier configuration of the first cell, reference may be made to the relevant description of S603, which will not be repeated here.

Steps S704 to S711 may refer to steps S504 to S511 for details, which will not be repeated here.

S712, the target access network device sends a handover failure (Handover Failure) message to the AMF entity, where the Handover Failure message is used to instruct the target access network device to reject the handover request message.

The Handover Failure message carries a second container, where the second container includes the CGI of the first cell and the carrier configuration of the first cell, and may also include the CGI of other cells of the target access network device and the corresponding carrier configuration.

After receiving the Handover Failure message, the AMF entity can send a Handover Preparation Failure (Handover Preparation Failure) message to the source access network device. The Handover Preparation Failure is used to notify the source access network device that the handover preparation fails.

Wherein, the Handover Preparation Failure message may include the above-mentioned second container.

Therefore, in the subsequent handover decision process, the source access network device can determine the target cell in combination with the carrier configuration of each cell under the target access network device.

Through the method provided by the embodiment of the present application, the source access network device can obtain the carrier configuration of each cell under the target access network device, so that in the subsequent cell handover process, the source access network device can determine that the terminal device supports the target cell when selecting the target cell. Whether the SCS/channel bandwidth capability supports the carrier configuration of the target cell, so as to avoid selecting a cell that is not supported by the terminal equipment as the target cell, compared to the target access network equipment judging whether the terminal equipment supports the carrier of the target cell when preparing for handover configuration, the embodiment of the present application can reduce the handover delay, and can improve the handover success rate.

As shown in FIG. 8 , another communication method provided by this embodiment of the present application can be applied to a scenario where an access network device communicates based on an NG interface, and the method may specifically include:

S801, the second access network device sends first information to the core network device, where the first information includes a carrier configuration of at least one cell of the second access network device, and the carrier configuration includes at least one of the following information: SCS, carrier bandwidth . Correspondingly, the core network device receives the first information.

S802, the core network device sends the first information to the first access network device. Correspondingly, the first access network device receives the first information.

S803, the first access network device determines the target cell according to the first information.

In some embodiments, the first access network device may also send the second information through the core network device, where the second information includes the carrier configuration of at least one cell of the first access network device. Therefore, the second access network device can also determine the target cell according to the second information.

In an implementation manner, the first access network device and the second access network device may exchange the carrier configuration of the cell before the cell handover.

In another implementation manner, the first access network device and the second access network device may also exchange the carrier configuration of the cell during the cell handover process.

The following describes the method for exchanging the carrier configuration of the cell between the first access network device and the second access network device during the cell handover process with reference to FIGS. 9-10 . The source access network device may be regarded as the first access network device and the target access network device may be regarded as the second access network device, or the source access network device may also be regarded as the second access network device and the target access network device. The access network device is regarded as the first access network device.

It should be noted that FIG. 9 and FIG. 10 only take the core network device as an AMF as an example for description, and the embodiment of the present application does not limit the type of the core network device.

In a possible implementation manner, the Handover Failure message and the Handover Preparation Failure message may include a failure cause value for indicating that the terminal device does not support the carrier configuration of the target cell, for example, the failure cause value may be SCS/carrier bandwidth not available Supported (SCS/carrierBandWidth Not Supported). The failure cause value may trigger the source access network device to send the carrier configuration of at least one cell of the source access network device through the target access network device. The carrier configuration of the target cell may include at least one of the following: the SCS of the target cell, and the carrier bandwidth of the target cell.

Where the terminal device does not support the carrier configuration of the cell, it can be understood that the terminal device meets at least one of the following conditions: the SCS supported by the terminal device is different from that of the cell, and the channel bandwidth supported by the terminal device is greater than the carrier bandwidth of the cell.

Conversely, when the terminal equipment supports the carrier configuration of the cell, it can be understood that the SCS supported by the terminal equipment is the same as the SCS of the cell, or it can also be understood that the channel bandwidth supported by the terminal equipment is less than or equal to the carrier bandwidth of the cell, or it can also be understood as The SCS supported by the terminal equipment is the same as the SCS of the cell, and the channel bandwidth supported by the terminal equipment is less than or equal to the carrier bandwidth of the cell.

As shown in FIG. 9 , the first access network device is the target access network device and the second access network device is the source access network device as an example for description. The first access network device and the second access network device The process of carrier configuration of the interacting cell may include:

S901-S911, for details, refer to steps S701-S711, which will not be repeated here.

S912, the target access network device sends a Handover Failure message to the AMF entity, where the Handover Failure message carries a handover failure reason, and the handover failure reason can be represented by a first reason value, and the first reason value is used to indicate that the terminal device does not support the first reason The carrier configuration of the cell.

In an example, the Handover Failure message can carry the cause of the handover failure by a bit, and when the bit takes different values, it can indicate different reasons for the handover failure. For example, if the bit field takes a value of 1, it can indicate The reason for the handover failure is that the terminal device does not support the carrier configuration of the first cell.

S913, the AMF entity sends a Handover Preparation Failure message to the source access network device, where the Handover Preparation Failure message carries a failure reason, and the failure reason is the first reason value.

S914: When the failure cause is the first cause value, the source access network device sends the carrier configuration of the cell of the source access network device to the AMF entity.

Exemplarily, the source access network device may send an uplink radio network configuration transfer (Uplink RAN Configuration Transfer) message to the AMF entity, where the Uplink RAN Configuration Transfer message carries the carrier configuration of the cell of the source access network device.

S915, the AMF entity forwards the carrier configuration of the cell of the source access network device to the target access network device.

Exemplarily, the AMF entity may send a Downlink RAN Configuration Transfer (Downlink RAN Configuration Transfer) message to the target access network device, where the Downlink RAN Configuration Transfer message carries the carrier configuration of the cell of the source access network device.

S916, the target access network device sends the carrier configuration of the cell of the target access network device to the AMF entity.

Exemplarily, the target access network device may send an Uplink RAN Configuration Transfer message to the AMF entity, where the Uplink RAN Configuration Transfer message carries the carrier configuration of the cell of the target access network device.

S917, the AMF entity forwards the carrier configuration of the cell of the target access network device to the source access network device.

Exemplarily, the AMF entity may send a Downlink RAN Configuration Transfer message to the source access network device, where the Downlink RAN Configuration Transfer message carries the carrier configuration of the cell of the source access network device.

It should be noted that steps S916-S917 can be triggered by S914-S915, that is, steps S916-S917 can be executed after S914-S915.

Alternatively, steps S916-S917 may also be executed after S903: the target access network device determines that the terminal device does not support the carrier configuration of the first cell, and steps S916-S917 and steps S914-S915 do not have a strict sequence, and can be executed first Steps S916-S917 are performed after steps S914-S915, or steps S916-S917 may be performed first and then steps S914-S915 may be performed, or steps S916-S917 and steps S914-S915 may be performed at the same time, which is not specifically limited here, or, you can also Only steps S916-S917 are performed, and steps S914-S915 are not performed, or only steps S914-S915 may be performed without performing steps S916-S917.

In a possible implementation manner, the first access network device is the source access network device and the second access network device is the target access network device as an example for description. As shown in FIG. 10 , the first access network device is used as an example. The process of exchanging the carrier configuration of the cell between the network device and the second access network device may include:

S1001, the source access network device sends a Handover Required message to the AMF, where the Handover Required message is used to request handover of the terminal device to the first cell of the target access network device.

Exemplarily, the Handover Required message may carry the carrier configuration of the cell of the source access network device, for example, the carrier configuration of the cell of the source access network device may be included in the first container.

The Handover Required message may further include other information, for details, please refer to the relevant description of the Handover Required message in step S701, which will not be repeated here.

S1002, the AMF entity sends a Handover Request message to the target access network device, where the Handover Request message is used to request that the terminal device be handed over to the first cell of the target access network device.

After receiving the Handover Request message, the target access network device determines whether to allow the terminal device to access the target cell according to the SCS/channel bandwidth capability supported by the terminal device and the SCS/carrier bandwidth of the target cell. The SCS is the same, and the carrier bandwidth of the target cell must be greater than or equal to the channel bandwidth capability of the terminal device, then the terminal device is allowed to access the target cell, and the target access network device sends a Handover Request Acknowledge message to the AMF. Otherwise, the terminal device is not allowed to access the target cell, and the target access network device sends a handover failure response message to the AMF.

S1003, the target access network device sends a Handover Request Acknowledge message to the AMF entity.

Optionally, the Handover Request Acknowledge message may carry the carrier configuration of the cell of the target access network device. For example, the Handover Request Acknowledge message includes a third container that carries the carrier configuration of the cell of the target access network device.

S1004, the AMF entity sends a Handover Command message to the source access network device, where the message is used to confirm that the target access network device side has prepared handover resources.

Optionally, the Handover Command message may carry the carrier configuration of the cell of the target access network device, for example, the Handover Command message carries the third container.

S1005-S1010, for details, refer to steps S506-S511, which will not be repeated here.

In yet another possible implementation manner, the first access network device and the second access network device may also exchange the carrier configuration of the cell in the process of establishing the NG interface. For example, the source access network device may send an NG setup request (NG Setup Request) message to the AMF entity, where the NG Setup Request message carries the carrier configuration of the cell of the source access network device, and the AMF entity forwards the NG to the target access network device Setup Request message. The target access network device may send an NG Setup Response (NG Setup Response) message to the AMF entity, where the NG Setup Request message carries the carrier configuration of the cell of the target access network device. The AMF entity may forward the NG Setup Response message to the source access network device.

Through the method provided in the embodiment of the present application, the access network devices can exchange the carrier configuration of the cell before or during the cell handover, so that the access network device can determine the target cell selection in the subsequent cell handover process. Whether the SCS/channel bandwidth capability supported by the terminal equipment supports the carrier configuration of the target cell, so that it can avoid selecting a cell that is not supported by the terminal equipment as the target cell. Compared with the current target access network equipment to determine whether the terminal equipment supports the handover when preparing for handover For the carrier configuration of the target cell, the embodiments of the present application can reduce the handover delay and improve the handover success rate.

Based on the same inventive concept as the method embodiments, the embodiments of the present application provide a communication device, the structure of which may be shown in FIG. 11 , including a transceiver unit 1101 and a processing unit 1102 .

In a specific implementation manner, the communication apparatus may be specifically used to implement the method performed by the target access network device in the embodiments as shown in FIGS. 6 to 7 , and the apparatus may be the target access network device itself or the target A chip in an access network device or a chip set or a part of the chip for performing the function of the related method. The transceiver unit 1101 is used to receive a handover request message from the core network device, and the handover request message is used to request that the terminal device be handed over to the first cell of the target access network device; the processing unit 1102 is used to determine that the terminal device meets the following conditions At least one of: the subcarrier spacing supported by the terminal device is different from the subcarrier spacing of the first cell, and the channel bandwidth supported by the terminal device is greater than the carrier bandwidth of the first cell; the transceiver unit 1101 is configured to send a handover failure message to the core network device , the handover failure message is used to instruct the target access network device to reject the handover request message, and the handover failure message carries cell information, the cell information includes the carrier configuration of the first cell, and the carrier configuration is at least one of the following information: subcarrier spacing, carrier bandwidth .

Exemplarily, the cell information further includes carrier configuration of at least one second cell of the target access network device.

Exemplarily, the cell information is carried in the container of the handover failure message.

Exemplarily, the cell information further includes a cell identifier of the first cell.

In a specific implementation manner, the communication apparatus may be specifically used to implement the method performed by the source access network device in the embodiments as shown in FIGS. 6 to 7 , and the apparatus may be the source access network device itself, or the source access network device itself. A chip in an access network device or a chip set or a part of the chip for performing the function of the related method. The transceiver unit 1101 is configured to send a handover request message to the core network device, where the handover request message is used to request that the terminal device be handed over to the first cell of the target access network device; and, receive a handover preparation failure message from the core network device, The handover preparation failure message is used to notify the source access network device that the handover preparation fails, and the handover failure message carries cell information, the cell information includes the carrier configuration of the first cell, and the carrier configuration includes at least one of the following information: subcarrier spacing, carrier bandwidth; The processing unit 1102 is configured to determine the target cell according to the cell information.

In a specific implementation manner, the communication apparatus may be specifically used to implement the method performed by the access network device in the embodiments as shown in FIGS. 8 to 10 , and the apparatus may be the access network device itself, or the access network. A chip in a device or a chipset or part of a chip for performing the function of a related method. The transceiver unit 1101 is configured to receive first information from a second access network device through a core network device, where the first information includes a carrier configuration of at least one cell of the second access network device, and the carrier configuration includes at least one of the following information Item: subcarrier spacing, carrier bandwidth; processing unit 1102, configured to determine the target cell according to the first information.

Optionally, the transceiver unit 1101 is further configured to send second information to the second access network device through the core network device, where the second information includes the carrier configuration of at least one cell of the first access network device.

Optionally, the transceiver unit 1101 is further configured to: before sending the second information to the second access network device through the core network device, send a handover request message to the core network device, where the handover request message is used to request that the terminal device be handed over to the second access network device. The first cell of the second access network device; the handover preparation failure message is received from the core network device, the handover preparation failure message is used to instruct the second access network device to reject the handover request message, and the handover failure message carries the failure reason, and the failure reasons include The terminal equipment does not meet at least one of the following conditions: the subcarrier spacing supported by the terminal equipment is different from the subcarrier spacing of the first cell, and the channel bandwidth supported by the terminal equipment is greater than the carrier bandwidth of the first cell.

In one embodiment, when sending the second information to the second access network device through the core network device, the transceiver unit 1101 is specifically configured to: send a handover request message to the core network device, where the handover request message is used to request the terminal device Handover to the second cell of the second access network device, and the handover request message carries the second information.

In an embodiment, when receiving the first information from the second access network device through the core network device, the transceiver unit 1101 is specifically configured to: receive a handover command message from the core network device, where the handover command message carries the first information.

Optionally, the transceiver unit 1101 is further configured to: before sending the second information to the second access network device through the core network device, receive a handover request message from the core network device, where the handover request message is used to request that the terminal device be handed over to the second access network device. The third cell of the first access network device.

The processing unit 1102 is further configured to: determine that the terminal equipment meets at least one of the following conditions: the subcarrier spacing supported by the terminal equipment is different from that of the third cell, and the channel bandwidth supported by the terminal equipment is greater than the carrier bandwidth of the third cell.

In an implementation manner, when receiving the first information from the second access network device through the core network device, the transceiver unit 1101 is specifically configured to: receive a handover request message from the core network device, and the handover request message is used to request the terminal device Handover to the fourth cell of the first access network device, and the handover request message carries the first information.

Optionally, when sending the second information to the second access network device through the core network device, the transceiver unit 1101 is specifically configured to: send a handover request response message to the core network device, where the handover request response message carries the second information.

The division of modules in the embodiments of the present application is schematic, and is only a logical function division. In actual implementation, there may be other division methods. In addition, the functional modules in the various embodiments of the present application may be integrated into one processing unit. In the device, it can also exist physically alone, or two or more modules can be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. It can be understood that, for the functions or implementations of each module in the embodiments of the present application, further reference may be made to the related descriptions of the method embodiments.

In a possible manner, the communication device may be as shown in FIG. 12 , and the communication device may be a communication device or a chip in the communication device, where the communication device may be a terminal device or a network device. The apparatus may include a processor 1201 , a communication interface 1202 , and a memory 1203 . The processing unit 1102 may be the processor 1201 . The transceiver unit 1101 may be the communication interface 1202 .

The processor 1201 may be a central processing unit (central processing unit, CPU), or a digital processing module or the like. The communication interface 1202 may be a transceiver, an interface circuit such as a transceiver circuit, or a transceiver chip or the like. The apparatus further includes: a memory 1203 for storing programs executed by the processor 1201 . The memory 1203 may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., and may also be a volatile memory (volatile memory), such as random access memory (random access memory). -access memory, RAM). The memory 1203 is, but is not limited to, any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.

The processor 1201 is used for executing the program code stored in the memory 1203, and is specifically used for executing the actions of the above-mentioned processing unit 1102, which will not be repeated in this application. The communication interface 1202 is specifically configured to perform the actions of the above-mentioned transceiver unit 1101, and details are not described herein again in this application.

The specific connection medium between the communication interface 1202 , the processor 1201 , and the memory 1203 is not limited in the embodiments of the present application. In the embodiment of the present application, the memory 1203, the processor 1201, and the communication interface 1202 are connected by a bus 1204 in FIG. 12. The bus is represented by a thick line in FIG. 12, and the connection mode between other components is only for schematic illustration. , is not limited. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in FIG. 12, but it does not mean that there is only one bus or one type of bus.

FIG. 13 is a schematic structural diagram of an access network device provided by an embodiment of the present application, such as a schematic structural diagram of a base station. As shown in FIG. 13 , the base station can perform the functions of the access network device in the method embodiments described in the foregoing FIGS. 6 to 10 . The base station 130 may include one or more distributed units (DUs) 1301 and one or more centralized units (CUs) 1302 . The DU 1301 may include at least one antenna 13011, at least one radio frequency unit 13015, at least one processor 13013 and at least one memory 13014. The DU 1301 part is mainly used for the transmission and reception of radio frequency signals, the conversion of radio frequency signals and baseband signals, and part of baseband processing. The CU 1302 may include at least one processor 13022 and at least one memory 13021 . Communication between the CU1302 and the DU1301 can be performed through an interface, wherein the control plane (Control plan) interface can be Fs-C, such as F1-C, and the user plane (User Plan) interface can be Fs-U, such as F1-U.

The CU 1302 part is mainly used to perform baseband processing, control the base station, and the like. The DU 1301 and the CU 1302 may be physically set together, or may be physically separated, that is, a distributed base station. The CU 1302 is the control center of the base station, which can also be called a processing unit, and is mainly used to complete the baseband processing function. For example, the CU 1302 may be used for the access network device to perform the operation flow of the communication between the access network device and the AMF entity in the method embodiments described in the above-mentioned FIG. 6 to FIG. 10 .

Specifically, the baseband processing on the CU and DU can be divided according to the protocol layers of the wireless network. For example, the functions of the PDCP layer and above are set in the CU, and the functions of the protocol layers below PDCP, such as the RLC layer and the MAC layer, are set in the DU. . For another example, the CU implements the functions of the RRC and PDCP layers, and the DU implements the functions of the RLC, MAC, and physical (physical, PHY) layers.

In addition, optionally, the base station 130 may include one or more radio frequency units (RUs), one or more DUs and one or more CUs. The DU may include at least one processor 13013 and at least one memory 13014 , the RU may include at least one antenna 13011 and at least one radio frequency unit 13015 , and the CU may include at least one processor 13022 and at least one memory 13021 .

In an example, the CU1302 may be composed of one or more boards, and the multiple boards may jointly support a wireless access network (such as a 5G network) with a single access indication, or may respectively support wireless access systems of different access standards. Access network (such as LTE network, 5G network or other network). The memory 13021 and the processor 13022 may serve one or more single boards. That is to say, the memory and processor can be provided separately on each single board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits may also be provided on each single board. The DU1301 can be composed of one or more single boards. Multiple single boards can jointly support a wireless access network (such as a 5G network) with a single access indication, or can support a wireless access network with different access standards (such as a 5G network). LTE network, 5G network or other network). The memory 13014 and processor 13013 may serve one or more single boards. That is to say, the memory and processor can be provided separately on each single board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits may also be provided on each single board.

Based on the above embodiments, the embodiments of the present application provide a communication system, where the communication system may include the first access network device, the second access network device, the core network device, and the like involved in the above embodiments. Alternatively, the communication system may include the source access network device, the target access network device, the core network device, etc. involved in the foregoing embodiments.

An embodiment of the present invention further provides a computer-readable storage medium for storing computer software instructions to be executed for executing the above-mentioned processor, which includes a program to be executed for executing the above-mentioned processor.

Embodiments of the present application further provide a computer program product, where the computer program product is used to store a computer program, and when the computer program is executed by a computer, the computer can implement the communication method provided by the above method embodiments.

An embodiment of the present application further provides a chip, where the chip is coupled with a memory, and the chip is used to implement the communication method provided by the above method embodiments.

As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the present application. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the protection scope of the present application. Thus, if these 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 also intended to include these modifications and variations.

Claims

A communication method, characterized in that the method comprises:

The target access network device receives a handover request message from the core network device, where the handover request message is used to request that the terminal device be handed over to the first cell of the target access network device;

The target access network device determines that the terminal device meets at least one of the following conditions: the subcarrier spacing supported by the terminal device is different from the subcarrier spacing of the first cell, and the channel bandwidth supported by the terminal device is greater than the carrier bandwidth of the first cell;

The target access network device sends a handover failure message to the core network device, where the handover failure message is used to instruct the target access network device to reject the handover request message, and the handover failure message carries cell information, The cell information includes a carrier configuration of the first cell, the carrier configuration at least one of the following information: subcarrier spacing, carrier bandwidth.
The method of claim 1, wherein the cell information further comprises a carrier configuration of at least one second cell of the target access network device.
The method according to claim 1 or 2, wherein the cell information is carried in a container of the handover failure message.
The method according to any one of claims 1-3, wherein the cell information further includes a cell identity of the first cell.
A communication method, characterized in that the method comprises:

The source access network device sends a handover request message to the core network device, where the handover request message is used to request that the terminal device be handed over to the first cell of the target access network device;

The source access network device receives a handover preparation failure message from the core network device, where the handover preparation failure message is used to notify the source access network device that the handover preparation fails, and the handover failure message carries cell information, so The cell information includes a carrier configuration of the first cell, and the carrier configuration includes at least one of the following information: subcarrier spacing, carrier bandwidth;

The source access network device determines a target cell according to the cell information.
The method of claim 5, wherein the cell information further comprises the carrier configuration of at least one second cell of the target access network device.
The method according to claim 5 or 6, wherein the cell information is carried in a container of the handover preparation failure message.
The method according to any one of claims 5-7, wherein the cell information further includes a cell identity of the first cell.
A communication method, characterized in that the method comprises:

The first access network device receives first information from the second access network device through the core network device, where the first information includes a carrier configuration of at least one cell of the second access network device, and the carrier configuration includes the following At least one item of information: subcarrier spacing, carrier bandwidth;

The first access network device determines a target cell according to the first information.
The method of claim 9, wherein the method further comprises:

The first access network device sends second information to the second access network device through the core network device, where the second information includes a carrier configuration of at least one cell of the first access network device.
The method according to claim 10, wherein before the first access network device sends the second information to the second access network device through the core network device, the method further comprises:

sending, by the first access network device, a handover request message to the core network device, where the handover request message is used to request that the terminal device be handed over to the first cell of the second access network device;

the first access network device receives a handover preparation failure message from the core network device, the handover preparation failure message is used to instruct the second access network device to reject the handover request message, and the handover failure message Carry the failure cause, which includes that the terminal device does not meet at least one of the following conditions: the subcarrier spacing supported by the terminal device is different from the subcarrier spacing of the first cell, and the channel bandwidth supported by the terminal device is greater than the carrier bandwidth of the first cell.
The method according to claim 10, wherein the first access network device sends the second information to the second access network device through the core network device, comprising:

The first access network device sends a handover request message to the core network device, where the handover request message is used to request handover of the terminal device to the second cell of the second access network device, and the handover request The message carries the second information.
The method according to claim 10 or 12, wherein the first access network device receives the first information from the second access network device through the access and mobility management function core network device, comprising:

The first access network device receives a handover command message from the core network device, where the handover command message carries the first information.
The method according to claim 10, wherein before the first access network device sends the second information to the second access network device through the core network device, the method further comprises:

receiving, by the first access network device, a handover request message from the core network device, where the handover request message is used to request that a terminal device be handed over to a third cell of the first access network device;

The first access network device determines that the terminal device meets at least one of the following conditions: the subcarrier interval supported by the terminal device is different from the subcarrier interval of the third cell, the channel bandwidth supported by the terminal device is different greater than the carrier bandwidth of the third cell.
The method of claim 9, wherein the first access network device receives the first information from the second access network device through the access and mobility management function core network device, comprising:

The first access network device receives a handover request message from the core network device, the handover request message is used to request handover of the terminal device to the fourth cell of the first access network device, and the handover request The message carries the first information.
The method according to claim 10 or 15, wherein the first access network device sends the second information to the second access network device through the core network device, comprising:

The first access network device sends a handover request response message to the core network device, where the handover request response message carries the second information.
A communication device, characterized in that the device comprises:

a transceiver unit, configured to receive a handover request message from the core network device, where the handover request message is used to request that the terminal device be handed over to the first cell of the target access network device;

a processing unit, configured to determine that the terminal device meets at least one of the following conditions: the subcarrier spacing supported by the terminal device is different from the subcarrier spacing of the first cell, and the channel bandwidth supported by the terminal device is greater than the the carrier bandwidth of the first cell;

The transceiver unit is configured to send a handover failure message to the core network device, where the handover failure message is used to instruct the target access network device to reject the handover request message, and the handover failure message carries cell information, The cell information includes a carrier configuration of the first cell, and the carrier configuration includes at least one item of the following information: subcarrier spacing and carrier bandwidth.
The apparatus of claim 17, wherein the cell information further comprises a carrier configuration of at least one second cell of the target access network device.
The apparatus according to claim 17 or 18, wherein the cell information is carried in a container of the handover failure message.
The apparatus according to any one of claims 17-19, wherein the cell information further includes a cell identifier of the first cell.
A communication device, characterized in that the device comprises:

a transceiver unit, configured to send a handover request message to the core network device, where the handover request message is used to request handover of the terminal device to the first cell of the target access network device; and, receive a handover preparation failure message from the core network device , the handover preparation failure message is used to notify the source access network device that the handover preparation fails, and the handover failure message carries cell information, the cell information includes the carrier configuration of the first cell, and the carrier configuration includes at least the following One piece of information: subcarrier spacing, carrier bandwidth;

and a processing unit, configured to determine a target cell according to the cell information.
The apparatus of claim 21, wherein the cell information further comprises the carrier configuration of at least one second cell of the target access network device.
The apparatus according to claim 21 or 22, wherein the cell information is carried in a container of the handover preparation failure message.
The apparatus according to any one of claims 21-23, wherein the cell information further includes a cell identifier of the first cell.
A communication device, characterized in that the device comprises:

A transceiver unit, configured to receive first information from a second access network device through a core network device, where the first information includes a carrier configuration of at least one cell of the second access network device, and the carrier configuration includes the following information At least one of: subcarrier spacing, carrier bandwidth;

and a processing unit, configured to determine a target cell according to the first information.
The apparatus of claim 25, wherein the transceiver unit is further configured to:

Send second information to the second access network device through the core network device, where the second information includes a carrier configuration of at least one cell of the first access network device.
The apparatus of claim 26, wherein the transceiver unit is further configured to:

Before sending the second information to the second access network device through the core network device, send a handover request message to the core network device, where the handover request message is used to request that the terminal device be handed over to the second access network device the first cell of the access network equipment;

Receive a handover preparation failure message from the core network device, where the handover preparation failure message is used to instruct the second access network device to reject the handover request message, and the handover failure message carries a failure reason, the failure reason Including that the terminal equipment does not meet at least one of the following conditions: the subcarrier spacing supported by the terminal equipment is different from the subcarrier spacing of the first cell, and the channel bandwidth supported by the terminal equipment is greater than the carrier bandwidth of the first cell. .
The apparatus of claim 26, wherein the transceiver unit, when sending the second information to the second access network device through the core network device, is specifically used for:

Send a handover request message to the core network device, where the handover request message is used to request handover of the terminal device to the second cell of the second access network device, and the handover request message carries the second information.
The apparatus according to claim 26 or 28, wherein the transceiver unit, when receiving the first information from the second access network device through the access and mobility management function core network device, is specifically configured to:

A handover command message is received from the core network device, where the handover command message carries the first information.
The apparatus of claim 26, wherein the transceiver unit is further configured to:

Before sending the second information to the second access network device through the core network device, receive a handover request message from the core network device, where the handover request message is used to request that the terminal device be handed over to the first access network device the third cell of the access network equipment;

The processing unit is also used for:

Determine that the terminal equipment meets at least one of the following conditions: the subcarrier spacing supported by the terminal equipment is different from the subcarrier spacing of the third cell, and the channel bandwidth supported by the terminal equipment is greater than the carrier of the third cell. bandwidth.
The apparatus of claim 25, wherein the transceiver unit, when receiving the first information from the second access network device through the access and mobility management function core network device, is specifically configured to:

A handover request message is received from the core network device, where the handover request message is used to request handover of the terminal device to the fourth cell of the first access network device, and the handover request message carries the first information.
The apparatus according to claim 26 or 31, wherein the transceiver unit, when sending the second information to the second access network device through the core network device, is specifically configured to:

Send a handover request response message to the core network device, where the handover request response message carries the second information.
A communication device, comprising a processor and a transceiver, wherein:

the transceiver, for sending and receiving data or information;

The processor, coupled to a memory, is configured to invoke a program in the memory to cause the communication device to perform the method of any one of claims 1-16.
A computer-readable storage medium, characterized by comprising instructions that, when executed on a computer, cause the computer to perform the method of any one of claims 1-16.