A cell selection method and apparatus

Abstract

The present invention discloses a cell selection method and apparatus. The method is applied to a source base station and includes: determining whether an Xn link with a target base station can be established; when it is determined that the Xn link with the target base station cannot be established, sending a handover request to an access mobility management unit; the handover request is used to hand over a user equipment corresponding to the source base station to a peer cell under the target base station; receiving a handover preparation failure response message sent by the access mobility management unit; wherein, the handover preparation failure response message is triggered when the peer cell determines that it does not support the bandwidth supported by the user equipment, and the handover preparation failure response message includes broadband information corresponding to the peer cell; updating a pre-stored peer cell information table based on the broadband information corresponding to the peer cell; and selecting a target cell for the user equipment based on the updated peer cell information table and the bandwidth information supported by the user equipment corresponding to the source base station.

Description

Technical Field

[0001] The present invention relates to the field of communication technologies, and in particular, to a cell selection method and apparatus. Background Art

[0002] Currently, in the existing Standalone (SA) networking scenario, when there is an Xn link and the Xn link can be established and used, during the establishment and configuration update process of the Xn link between the source base station and the target base station, the source base station and the target base station can interact the channel bandwidth information of the current cell in the serving cell information of the Xn link establishment and configuration update message. Therefore, when the source base station subsequently switches to select a target cell, based on the bandwidth capability supported by the terminal device and the channel bandwidth information of the current cell, a suitable target cell can be selected for the terminal to perform the handover.

[0003] However, when the Xn link cannot be established and used, only the NG handover process can be triggered. However, due to the unavailability of the Xn, the channel bandwidth information of the peer cell corresponding to the target base station cannot be obtained in a timely manner during the Xn establishment or configuration update phase. Therefore, when the source base station selects a target cell, due to inaccurate judgment of the channel bandwidth information of the peer cell, this handover fails, and it may cause subsequent continuous failures in the handover preparation between the user equipment corresponding to the source base station and the target cell, that is, the target cell cannot be quickly and accurately selected for the user equipment. Summary of the Invention

[0004] The present invention provides a cell selection method and apparatus, which are used to solve the problem that when the Xn link cannot be established and used, the source base station cannot effectively obtain the channel bandwidth information supported by the peer cell corresponding to the target base station, resulting in the inability to quickly and accurately select a target cell for the user equipment.

[0005] The specific technical solutions provided by the embodiments of the present invention are as follows:

[0006] In a first aspect, an embodiment of the present invention provides a cell selection method, which is applied to a source base station, and the method includes:

[0007] Determine whether the Xn link with the target base station can be established;

[0008] When it is determined that the Xn link with the target base station cannot be established, send a handover request to the access mobility management unit; the handover request is used to hand over the user equipment corresponding to the source base station to the peer cell under the target base station;

[0009] Receive the handover preparation failure response message sent by the access mobility management unit; wherein, the handover preparation failure response message is triggered when the peer cell determines that it does not support the bandwidth supported by the user equipment, and the handover preparation failure response message includes the broadband information corresponding to the peer cell;

[0010] Update the pre-stored peer cell information table based on the broadband information corresponding to the peer cell; and select a target cell for the user equipment based on the updated peer cell information table and the bandwidth information supported by the user equipment corresponding to the source base station.

[0011] In a possible implementation manner, when the peer cell supports co-construction and sharing operator services, the bandwidth information includes different bandwidth information under each operator supported by the peer cell.

[0012] In a possible implementation manner, when the peer cell is a cell that supports multiple partial bandwidths, the bandwidth information includes the dedicated cell channel bandwidth list information corresponding to each of the partial bandwidths.

[0013] In a possible implementation manner, selecting a target cell for the user equipment based on the updated peer cell information table and the bandwidth information supported by the user equipment corresponding to the source base station includes:

[0014] Determine the bandwidth information supported by the neighbor cell of the peer cell from the bandwidth information in the updated peer cell information table;

[0015] When it is determined that the bandwidth information supported by the user equipment matches the bandwidth information supported by the neighbor cell of the peer cell, determine the neighbor cell of the peer cell as the target cell.

[0016] In a second aspect, an embodiment of the present invention provides a cell selection device, the device includes a memory, a transceiver, and a processor:

[0017] The memory is used to store a computer program; the transceiver is used to send and receive data under the control of the processor; the processor is used to read the computer program in the memory and perform the following operations:

[0018] Determine whether an Xn link with the target base station can be established;

[0019] When it is determined that the Xn link with the target base station cannot be established, send a handover request to the access mobility management unit; the handover request is used to hand over the user equipment corresponding to the source base station to the peer cell under the target base station;

[0020] Receive the handover preparation failure response message sent by the access mobility management unit; wherein, the handover preparation failure response message is triggered when the peer cell determines that it does not support the bandwidth supported by the user equipment, and the handover preparation failure response message includes the broadband information corresponding to the peer cell;

[0021] Update the pre-stored peer cell information table based on the broadband information corresponding to the peer cell; and select a target cell for the user equipment based on the updated peer cell information table and the bandwidth information supported by the user equipment corresponding to the source base station.

[0022] In a possible implementation manner, when the peer cell supports the co-construction and sharing operator service, the bandwidth information includes different bandwidth information under each operator supported by the peer cell.

[0023] In a possible implementation manner, when the peer cell is a cell supporting multiple partial bandwidths, the bandwidth information includes the dedicated cell channel bandwidth list information corresponding to each of the partial bandwidths.

[0024] In a possible implementation manner, the processor is configured to execute:

[0025] Determine the bandwidth information supported by the neighbor cell of the peer cell from the bandwidth information in the updated peer cell information table;

[0026] When it is determined that the bandwidth information supported by the user equipment matches the bandwidth information supported by the neighbor cell of the peer cell, determine the neighbor cell of the peer cell as the target cell.

[0027] In a third aspect, an embodiment of the present invention provides a cell selection device, and the device includes:

[0028] A determination unit, configured to determine whether an Xn link with a target base station can be established;

[0029] A sending unit, configured to send a handover request to the access mobility management unit when it is determined that the Xn link with the target base station cannot be established; the handover request is used to hand over the user equipment corresponding to the source base station to a peer cell under the target base station;

[0030] A receiving unit, configured to receive the handover preparation failure response message sent by the access mobility management unit; wherein, the handover preparation failure response message is triggered when the peer cell determines that it does not support the bandwidth supported by the user equipment, and the handover preparation failure response message includes the broadband information corresponding to the peer cell;

[0031] A processing unit, configured to update a pre-stored peer cell information table based on the broadband information corresponding to the peer cell; and select a target cell for the user equipment based on the updated peer cell information table and the bandwidth information supported by the user equipment corresponding to the source base station.

[0032] In a fourth aspect, an embodiment of the present invention provides a processor-readable storage medium storing a computer program for causing the processor to execute the method according to any one of the first aspects.

[0033] In the embodiment of the present invention, during the NG handover process, based on the bandwidth information corresponding to the peer cell carried in the handover preparation failure response message, the bandwidth information table of the peer cell can be maintained and updated, and the update and maintenance are distinguished for different operators. Moreover, it can also achieve the target cell selection requirement for mobility handover of terminals compatible with different operators under co-construction and sharing. It can be seen that it is possible to effectively select a suitable target cell for the user equipment based on the channel bandwidth supported by the user equipment's capabilities and the bandwidth information corresponding to the peer cell, so as to solve the problem in the prior art that during NG handover, the source base station cannot accurately and quickly select a suitable target cell because it cannot obtain the channel bandwidth supported by the peer cell, and the continuous NG handover preparation failure caused thereby. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present invention, and are used together with the specification to explain the principles of the present invention, and do not constitute an improper limitation to the present invention.

[0035] Figure 1 Schematic diagram of Xn link establishment in the prior art;

[0036] Figure 2 Schematic diagram of the process of node configuration update in the Xn link in the prior art;

[0037] Figure 3 Schematic diagram of information interaction between the source base station and the access mobility management unit in the prior art;

[0038] Figure 4 Schematic diagram of information interaction between the target base station and the access mobility management unit in the prior art;

[0039] Figure 5 Flowchart of the steps of a method for cell selection provided by an embodiment of the present invention;

[0040] Figure 6 Schematic diagram of information interaction among the source base station, the target base station, and the access mobility management unit provided by an embodiment of the present invention;

[0041] Figure 7Schematic diagram of the physical architecture of a cell selection device provided by an embodiment of the present invention;

[0042] Figure 8 Schematic diagram of the logical architecture of a cell selection provided by an embodiment of the present invention. Detailed implementation manners

[0043] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the scope of protection of the present invention. Without conflict, the embodiments in the present invention and the features in the embodiments may be arbitrarily combined with each other. And although the logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than here.

[0044] To better understand this solution, some processes and terms involved are described below:

[0045] 1. Terminal device:

[0046] The terminal device involved in the embodiments of the present invention can be a device that provides voice and / or data connectivity to users, such as a handheld device with wireless connection capabilities, or other processing devices connected to a wireless modem, etc. In different systems, the name of the terminal device may also be different. For example, in a 5G system, the terminal device can be called a User Equipment (UE). The wireless terminal device can communicate with one or more core networks (CN) via a Radio Access Network (RAN). The wireless terminal device can be a mobile terminal device, such as a mobile phone (or a "cellular" phone) and a computer with a mobile terminal device. For example, it can be a portable, pocket-sized, handheld, computer-integrated, or vehicle-mounted mobile device that exchanges language and / or data with the wireless access network. For example, devices such as Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). The wireless terminal device can also be called a system, subscriber unit, subscriber station, mobile station, mobile, remote station, access point, remote terminal, access terminal, user terminal, user agent, user device, which is not limited in the embodiments of the present invention.

[0047] 2. Network-side device:

[0048] The network-side device involved in the embodiments of the present invention may be a base station, which may include multiple cells that provide services to terminals. Depending on specific application scenarios, the base station may also be referred to as an access point, or may be a device in the access network that communicates with wireless terminal devices through one or more sectors over the air interface, or other names. The network-side device can be used to mutually replace the received air frames and Internet Protocol (IP) packets, and act as a router between the wireless terminal device and the rest of the access network, where the rest of the access network may include an Internet Protocol (IP) communication network. The network-side device can also coordinate the attribute management of the air interface. For example, the network-side device involved in the embodiments of the present invention may be a network-side device (Base Transceiver Station, BTS) in a Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA), may also be a network-side device (NodeB) in a Wide-band Code Division Multiple Access (WCDMA), may also be an evolved network-side device (evolutional Node B, eNB or e-NodeB) in a Long Term Evolution (LTE) system, a 5G base station (gNB) in a 5G network architecture (next generation system), may also be a Home evolved Node B (HeNB), a relay node, a femto, a pico, etc., which are not limited in the embodiments of the present invention. In some network structures, the network-side device may include a centralized unit (centralized unit, CU) node and a distributed unit (distributed unit, DU) node, and the centralized unit and the distributed unit may also be geographically separated.

[0049] Specifically, the network-side device and the terminal device can each use one or more antennas for multi-input multi-output (MIMO) transmission. The MIMO transmission can be single-user MIMO (SU-MIMO) or multi-user MIMO (MU-MIMO). According to the form and quantity of the root antenna combination, the MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO or massive-MIMO, or it can also be diversity transmission, precoding transmission, beamforming transmission, etc.

[0050] Please refer to Figure 1 As shown, in the existing standalone (SA) networking scenario, when there is an Xn link and the Xn link is available, the Xn establishment process between the NG radio access network node 1 (NG-RAN node1), i.e., the source base station, and the NG-RAN node2, i.e., the target base station, will be based on, for example, Figure 1 In the figure. Specifically, when it is determined that there is an Xn link between the source base station and the target base station, the NG-RAN node1 can send an Xn link establishment request to the NG-RAN node1, so that the NG-RAN node1 can receive the Xn link establishment success response information sent by the NG-RAN node2.

[0051] And, please refer to Figure 2 As shown in the figure, the source base station NG-RAN node1 sends an NG-RAN node configuration update request to the target base station NG-RAN node2, and then the target base station NG-RAN node2 sends an NR-RAN node configuration update confirmation message to the source base station NG-RAN node1.

[0052] It can be seen that the channel bandwidth information of the current cell is interacted in the service cell information of the Xn link establishment and configuration update message. Therefore, when the source base station selects a target cell for handover of the corresponding user equipment subsequently, it can select a suitable target cell for the user equipment to perform handover based on the bandwidth capability supported by the user equipment and the channel bandwidth information of the target cell.

[0053] Specifically, when the source base station has an Xn link failure or the Xn link does not exist, on the one hand, due to the lack of an effective Xn link, the channel bandwidth information supported by the current cell corresponding to the target base station cannot be effectively interacted through the Xn establishment and configuration update process. On the other hand, handover cannot be performed through the Xn link, and only an NG handover can be triggered. In this case, the channel bandwidth information of the peer cell referred to when selecting the NG handover target cell may be inaccurate.

[0054] Please refer to Figure 3 as shown Figure 3 in the figure, which is a schematic diagram of information interaction between a source base station and an Access and Mobility Management Function (AMF) in the prior art. And, please refer to Figure 4 , Figure 4 which is a schematic diagram of information interaction between a target base station and an access and mobility management unit in the prior art. Specifically, when triggering a message 1 in Figure 3 i.e., a handover request, it is impossible to accurately determine whether the current cell meets the working bandwidth of the UE, that is, a handover is triggered. Therefore, when the target cell receives a message 2 in Figure 4 i.e., a handover request and processes it, specifically, the aforementioned processing is to determine that the current cell does not support the channel bandwidth of the UE or it is impossible to select a suitable Bandwidth Part (BWP) based on the channel bandwidth supported by the UE, that is, the transmission bandwidth or channel bandwidth of the current cell does not meet the working bandwidth requirements supported by the UE. At this time, the handover preparation of the target cell will fail.

[0055] Furthermore, since currently in the message 3 of the NG handover target, i.e., the handover preparation failure response message, and the message 4, i.e., the handover preparation failure message, the channel bandwidth information supported by the handover preparation failure cell is not returned, which will result in the inability to provide a reference for subsequent NG handovers based on this failure. Therefore, the handover preparation failure between the source base station and the current cell may continue to fail. Even if there is a handover penalty function for the target cell based on this failure reason, it will take some time for statistics to determine whether the penalty is triggered and takes effect. Moreover, even if the penalty takes effect, after the subsequent penalty timing recovery ends, the handover preparation failure between the source and target cells may be triggered again, resulting in the inability to quickly and accurately select a target cell for the user equipment.

[0056] In view of this, the present invention provides a method for selecting a target cell for NG handover based on the transmission bandwidth supported by the peer cell or the different BWP channel bandwidths supported by the peer cell when the Xn link cannot be established in the SA networking scenario, effectively selecting a suitable target cell for the UE based on the channel bandwidth supported by the UE's capabilities and the transmission bandwidth or multi-BWP channel bandwidth supported by the peer cell, so as to solve the problem that in the prior art during NG handover, the source base station cannot accurately and quickly select a suitable target cell due to the inability to obtain the channel bandwidth supported by the peer cell, and the resulting continuous NG handover preparation failure.

[0057] Please refer to Figure 5 as shown in the figure, which is a flowchart of the steps of a cell selection method provided by an embodiment of the present invention, applied to a source base station. The steps are as follows:

[0058] Step 501: Determine whether an Xn link with the target base station can be established.

[0059] In an embodiment of the present invention, the source base station may send an Xn link establishment request to the target base station. When the source base station does not receive the successful Xn link establishment response information from the target base station, it can be determined that the Xn link with the target base station cannot be established.

[0060] In an embodiment of the present invention, if the Xn link between the source base station and the target base station is not deployed, that is, the Xn link does not exist, the source base station can determine that the Xn link with the target base station cannot be established.

[0061] Step 502: When it is determined that the Xn link with the target base station cannot be established, send a handover request to the access and mobility management unit; the handover request is used to hand over the user equipment corresponding to the source base station to the peer cell under the target base station.

[0062] In an actual example of the present invention, when the source base station determines that the Xn link with the target base station cannot be established, it can send a handover request to the Access and Mobility Management Function (AMF). Among them, the handover request is used to hand over the user equipment corresponding to the source base station to the peer cell under the target base station.

[0063] It can be seen that in an embodiment of the present invention, when the Xn link cannot be established between the source base station and the target base station, an NG handover is performed to achieve the purpose of selecting a target cell for the user equipment.

[0064] Step 503: Receive a handover preparation failure response message sent by the access and mobility management unit; wherein, the handover preparation failure response message is triggered when the peer cell determines that it does not support the bandwidth supported by the user equipment, and the handover preparation failure response message includes the broadband information corresponding to the peer cell.

[0065] In an embodiment of the present invention, please refer to Figure 6 As shown, the access and mobility management unit adds and transmits the uplink and downlink transmission bandwidth information supported by the peer cell or multiple uplink and downlink channel bandwidth list information in the handover preparation failure message corresponding to the target base station side in the handover, i.e., message 3, and in the AMF internal interaction and the NG interface handover preparation failure response message, i.e., message 4 response.

[0066] Specifically, in the Target to Source Failure Transparent Container in the HANDOVER PREPARATION FAILURE message and the HANDOVER FAILURE message, the content of the CellBandWithInfo corresponding to the peer cell is added. The CellBandWithInfo content is used to indicate the uplink and downlink transmission bandwidths of the peer cell under multiple co - constructed and shared remaining minimum system information (SIB1) broadcasts under the current NR cell partial identifier (NRCell Part Identifier, NR - PCI), NR cell global identifier (NR Cell Global Identifier, NRCGI), and tracking area code (Tracking Area Code, TAC) of the PLMNs (Public Land Mobile Network), or the list information of multiple uplink and downlink channel bandwidths currently supported by the cell. Among them, the cell type is Time Division Duplex (TDD) or Frequency Division Duplex (FDD). It should be noted that when there are multiple uplink and downlink channel bandwidth information corresponding to the peer cell, the uplink and downlink transmission bandwidth information of the cell can be ignored.

[0067] Specifically, in the NG handover process, when the peer cell is making an admission decision, if the bandwidth of the peer cell does not support the bandwidth supported by the UE, that is, the channel bandwidth supported by the UE does not belong to any of the channel bandwidths supported by the peer cell, then the bandwidth information corresponding to the peer cell needs to be carried in the CellBandWithInfo of the NG handover preparation failure response message. Then the target base station sends this handover preparation failure response message to the access mobility management unit, so that the handover preparation failure response message sent by the access mobility management unit to the source base station includes the bandwidth information corresponding to the peer cell.

[0068] Exemplarily, if the peer cell is a co - constructed and shared cell, that is, the peer cell supports co - constructed and shared operator services, then the aforementioned bandwidth information corresponding to the peer cell includes different bandwidth information under each operator supported by the peer cell. Specifically, the bandwidth information supported by the cell planned by different operators under co - construction and sharing can be carried according to multiple co - constructed and shared Broadcast PLMNs.

[0069] In an embodiment of the present invention, when the bandwidth information in the handover preparation failure response message is interacted according to co - construction and sharing operators, then, for a cell supporting co - construction and sharing, when interacting between the source base station and the access mobile management unit, and between the target base station and the access mobile management unit, the cell transmission bandwidth information under all co - construction and sharing operators of this cell is interacted. This is used to support different bandwidth configurations of the same cell under different operators in the case of operator co - construction and sharing, so as to meet the mobile handover target cell selection of terminals of different operators under co - construction and sharing. At the same time, when an NG handover fails once, the bandwidth information under all co - construction and sharing operators of the cell can be interacted, without the need to interact once for each operator, effectively serving users of different operators.

[0070] Exemplarily, when the peer cell is a cell supporting multiple partial bandwidths, the bandwidth information corresponding to the aforementioned peer cell includes the dedicated cell channel bandwidth information list information corresponding to all partial bandwidths. Specifically, the dedicated uplink and downlink channel bandwidth list information corresponding to each BWP can be carried in multiple uplink and downlink channel bandwidth list information of CellBandWithInfo at the same time.

[0071] In an embodiment of the present invention, when the bandwidth information in the handover preparation failure response message is for a cell supporting multiple BWP specifications, then, when interacting between the source base station and the access mobile management unit, and between the target base station and the access mobile management unit, the dedicated cell channel bandwidth list information corresponding to each BWP of this cell is interacted, which is used to select a suitable target cell for the UE during the mobility handover process of the terminal based on the multiple BWP bandwidth specifications when the same cell is configured with multiple BWP bandwidth specifications.

[0072] Step 504: Update the pre - saved peer cell information table based on the bandwidth information corresponding to the peer cell; and select a target cell for the user equipment based on the updated peer cell information table and the bandwidth information supported by the user equipment corresponding to the source base station.

[0073] In an embodiment of the present invention, the source base station can determine the bandwidth information supported by the neighboring cells of the peer cell from the bandwidth information in the updated peer cell information table; when it is determined that the bandwidth information supported by the user equipment matches the bandwidth information supported by the neighboring cells of the peer cell, then the neighboring cell of the peer cell is determined as the target cell.

[0074] It can be seen that in an embodiment of the present invention, a target cell can be selected for the user equipment based on the bandwidth information in the updated peer cell information table.

[0075] In an embodiment of the present invention, when it is determined that the bandwidth information supported by the user equipment does not belong to the bandwidth information supported by the neighboring cells of the peer cell, it is considered that the peer cell does not meet the handover requirement, and thus the peer cell is not selected as the target cell. In this way, it is possible to avoid sending multiple handovers to the peer cell subsequently, thereby avoiding the situation of continuous NG handover preparation failure.

[0076] It can be seen that in an embodiment of the present invention, the content of the bandwidth information (CellBandWithInfo) of the peer cell can be added to the Target to Source Failure Transparent Container in HANDOVER PREPARATION FAILURE and HANDOVER FAILURE, and the CellBandWithInfo is used to transmit the cell bandwidth information, and at the same time, the scenario of filling and transmitting is defined, so as to reduce unnecessary interactive transmission. In addition, during the NG handover process, based on the information carried in the handover preparation failure response message, the bandwidth information table of the peer cell can be maintained and updated, and the update and maintenance are distinguished for operator maintenance. It can also meet the requirements for selecting the target cell for mobility handover of terminals of different operators under co-construction and sharing.

[0077] Based on the same inventive concept, refer to Figure 7 As shown, the embodiment of the present invention provides a device for a cell selection method, including a memory 701, a transceiver 702, and a processor 703:

[0078] The memory 701 is used to store a computer program; the transceiver 702 is used to transmit and receive data under the control of the processor; the processor 703 is used to read the computer program in the memory and perform the following operations:

[0079] Determine whether an Xn link with the target base station can be established;

[0080] When it is determined that the Xn link with the target base station cannot be established, send a handover request to the access mobility management unit; the handover request is used to hand over the user equipment corresponding to the source base station to the peer cell under the target base station;

[0081] Receive the handover preparation failure response message sent by the access mobility management unit; wherein, the handover preparation failure response message is triggered when the peer cell determines that it does not support the bandwidth supported by the user equipment, and the handover preparation failure response message includes the broadband information corresponding to the peer cell;

[0082] Update the pre-stored peer cell information table based on the broadband information corresponding to the peer cell; and select a target cell for the user equipment based on the updated peer cell information table and the bandwidth information supported by the user equipment corresponding to the source base station.

[0083] In a possible implementation manner, when the peer cell supports the co-construction and sharing operator service, the bandwidth information includes different bandwidth information under each operator supported by the peer cell.

[0084] In a possible implementation manner, when the peer cell is a cell supporting multiple partial bandwidths, the bandwidth information includes the dedicated cell channel bandwidth list information corresponding to each of the partial bandwidths.

[0085] In a possible implementation manner, the processor 703 is configured to execute:

[0086] Determine the bandwidth information supported by the neighbor cell of the peer cell from the bandwidth information in the updated peer cell information table;

[0087] When it is determined that the bandwidth information supported by the user equipment matches the bandwidth information supported by the neighbor cell of the peer cell, determine the neighbor cell of the peer cell as the target cell.

[0088] Based on the same inventive concept, refer to Figure 8 As shown, an embodiment of the present invention provides a cell selection device, and the device includes:

[0089] A determination unit 801, configured to determine whether an Xn link with a target base station can be established;

[0090] A sending unit 802, configured to send a handover request to an access mobility management unit when it is determined that the Xn link with the target base station cannot be established; the handover request is used to hand over the user equipment corresponding to the source base station to a peer cell under the target base station;

[0091] A receiving unit 803, configured to receive a handover preparation failure response message sent by the access mobility management unit; wherein, the handover preparation failure response message is triggered when the peer cell determines that it does not support the bandwidth supported by the user equipment, and the handover preparation failure response message includes the broadband information corresponding to the peer cell;

[0092] A processing unit 804, configured to update the pre-stored peer cell information table based on the broadband information corresponding to the peer cell; and select a target cell for the user equipment based on the updated peer cell information table and the bandwidth information supported by the user equipment corresponding to the source base station.

[0093] Based on the same inventive concept, an embodiment of the present invention provides a processor-readable storage medium storing a computer program for causing the processor to execute a cell selection method.

[0094] Those skilled in the art should understand that the embodiments of the present invention may be provided as a method, a system, or a computer program product. Therefore, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0095] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for realizing the functions specified in Figure 1 one or more of the flows Figure 1 or blocks or the combination of blocks.

[0096] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device that realizes the functions specified in Figure 1 one or more of the flows Figure 1 or blocks or the combination of blocks.

[0097] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for realizing the functions specified in Figure 1 one or more of the flows Figure 1 or blocks or the combination of blocks.

[0098] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A cell selection method, characterized in that, Applied to the source base station, the method includes: Determine whether an Xn link with the target base station can be established; When it is determined that the Xn link with the target base station cannot be established, send a handover request to the access mobile management unit; the handover request is used to hand over the user equipment corresponding to the source base station to the peer cell under the target base station; Receive the handover preparation failure response message sent by the access mobile management unit; wherein, the handover preparation failure response message is triggered when the peer cell determines that it does not support the bandwidth supported by the user equipment, and the handover preparation failure response message includes the broadband information corresponding to the peer cell; Update the pre-stored peer cell information table based on the broadband information corresponding to the peer cell; and select a target cell for the user equipment based on the updated peer cell information table and the bandwidth information supported by the user equipment corresponding to the source base station.

2. The method according to claim 1, wherein When the peer cell supports the co-construction and sharing operator service, the bandwidth information includes different bandwidth information under each operator supported by the peer cell.

3. The method according to claim 1, characterized in that, When the peer cell is a cell supporting multiple partial bandwidths, the bandwidth information includes the dedicated cell channel bandwidth list information corresponding to each of the partial bandwidths.

4. The method according to any one of claims 1-3, characterized in that Selecting a target cell for the user equipment based on the updated peer cell information table and the bandwidth information supported by the user equipment corresponding to the source base station includes: Determine the bandwidth information supported by the neighboring cells of the peer cell from the bandwidth information in the updated peer cell information table; When it is determined that the bandwidth information supported by the user equipment matches the bandwidth information supported by the neighboring cells of the peer cell, determine the neighboring cell of the peer cell as the target cell.

5. A cell selection device, characterized in that, The device includes a memory, a transceiver, and a processor: The memory is used to store computer programs; the transceiver is used to send and receive data under the control of the processor; the processor is used to read the computer programs in the memory and perform the following operations: Determine whether an Xn link with the target base station can be established; When it is determined that the Xn link with the target base station cannot be established, send a handover request to the access mobile management unit; The handover request is used to hand over the user equipment corresponding to the source base station to the peer cell under the target base station; Receive the handover preparation failure response message sent by the access mobile management unit; wherein, the handover preparation failure response message is triggered when the peer cell determines that it does not support the bandwidth supported by the user equipment, and the handover preparation failure response message includes the broadband information corresponding to the peer cell; Update the pre-stored peer cell information table based on the broadband information corresponding to the peer cell; and select a target cell for the user equipment based on the updated peer cell information table and the bandwidth information supported by the user equipment corresponding to the source base station.

6. The device according to claim 5, characterized in that When the peer cell supports the co-construction and sharing operator service, the bandwidth information includes different bandwidth information under each operator supported by the peer cell.

7. The device according to claim 5, characterized in that, When the peer cell is a cell supporting multiple partial bandwidths, the bandwidth information includes the dedicated cell channel bandwidth list information corresponding to each of the partial bandwidths respectively.

8. The device according to any one of claims 5-7, characterized in that The processor is configured to execute: Determine the bandwidth information supported by the neighboring cell of the peer cell from the bandwidth information in the updated peer cell information table; When it is determined that the bandwidth information supported by the user equipment matches the bandwidth information supported by the neighboring cell of the peer cell, determine the neighboring cell of the peer cell as the target cell.

9. A cell selection device, characterized in that, The apparatus includes: A determination unit, configured to determine whether an Xn link with a target base station can be established; A sending unit, configured to send a handover request to the access mobility management unit when it is determined that the Xn link with the target base station cannot be established; the handover request is used to hand over the user equipment corresponding to the source base station to the peer cell under the target base station; A receiving unit, configured to receive a handover preparation failure response message sent by the access mobility management unit; wherein, the handover preparation failure response message is triggered when the peer cell determines that it does not support the bandwidth supported by the user equipment, and the handover preparation failure response message includes the broadband information corresponding to the peer cell; A processing unit, configured to update the pre-stored peer cell information table based on the broadband information corresponding to the peer cell; and select a target cell for the user equipment based on the updated peer cell information table and the bandwidth information supported by the user equipment corresponding to the source base station.

10. A processor-readable storage medium, characterized in that, The processor-readable storage medium stores a computer program, and the computer program is used to cause the processor to execute the method according to any one of claims 1 to 4.

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