CN115314955A - Method, device, equipment, medium and chip for determining candidate cell - Google Patents

Abstract

The present application discloses a method, apparatus, device, medium and chip for determining a candidate cell, wherein the method includes: acquiring a candidate cell list, where the candidate cell list includes cell identification information of one or more candidate cells; The element reports the candidate cell list. The candidate cell list is used to determine the target candidate cell. The target candidate cell is the cell to be conditionally handed over by the second network element. The first network element and the second network element are network elements in the mobile communication network. With this method, the number of cells to be selected during the conditional handover can be reduced, and the signaling overhead of the Xn interface can be reduced.

Description

A method, device, equipment, medium and chip for determining a candidate cell

technical field

The present application relates to the technical field of communication, and in particular to a method, device, equipment, medium and chip for determining a candidate cell.

Background technique

In the 5G New Radio (New Radio, NR) system, a terminal device (User Equipment, UE) can perform cell handover between an indoor small base station and an outdoor macro base station (Macro Base Station). That is to say, the terminal device can be handed over from an indoor small base station to an outdoor macro base station, or from an outdoor macro base station to an indoor small base station.

Currently, base station handover can be implemented by a conditional handover (Conditional Handover, CHO) method. In the current CHO, the source base station determines the candidate cells for CHO according to the measurement results reported by the UE, and the source base station will send a CHO request to all candidate cells to request all candidate cells to configure the wireless side configuration of the candidate cells and the CHO configuration. execution conditions. The measurement result of the UE is performed according to the measurement event configured by the base station. The measurement time generally refers to the A3 event, and the A3 event refers to the fact that the offset of the neighboring cell exceeds the cell to which the terminal device is connected (ie, the cell of the source base station), wherein the neighboring cell and the cell to which the terminal device is connected Can belong to different base stations.

How to determine a candidate cell for a terminal device when performing a conditional handover has become a hot research issue.

Contents of the invention

The application discloses a method, device, equipment, medium and chip for determining a candidate cell, which can reduce the number of selected cells during conditional handover and reduce the signaling overhead of the Xn interface.

In the first aspect, the embodiment of the present application provides a method for determining a candidate cell, the method including:

Obtaining a list of candidate cells, the list of candidate cells includes information of one or more candidate cells;

Report the list of candidate cells to the first network element, the list of candidate cells is used to determine the target candidate cell, the target candidate cell is the cell to be handed over by the second network element, the first network element and the second network element are mobile communication network network element.

In one embodiment, the candidate cell list includes one or more of the following information:

Cell identification information corresponding to each candidate cell in the candidate cell list;

The working mode of each candidate cell in the candidate cell list;

PLMN IDs of public land mobile network identifiers to which each candidate cell in the candidate cell list belongs;

The tracking area code TAC of each candidate cell in the candidate cell list.

In one embodiment, the candidate cell list is determined according to one or more of the following methods:

Determined according to the historical handover record, the historical handover record includes historical cell handover information, and the historical cell handover information is the cell information of the cell that the second network element has accessed after the cell handover; or,

Determined according to the core network-assisted radio access network RAN parameter tuning, the core network-assisted radio access network RAN parameter tuning is delivered by the core network to the second network element; or,

Determined according to the automatic neighbor relationship, where the automatic neighbor relationship is used by the first network element to determine the neighbor relationship.

In one embodiment, a measurement event is triggered, and a list of candidate cells is reported to the first network element;

In one embodiment, measurement events include one or more of the following events:

A2 event, the A2 event is used to indicate that the signal quality of the serving cell is lower than the first threshold;

A3 event, the A3 event is used to indicate that the signal quality offset of the neighboring cell is higher than the signal quality of the serving cell;

A4 event, the A4 event is used to indicate that the signal quality of the neighboring cell is higher than the second threshold;

A5 event, the A5 event is used to indicate that the signal quality of the neighboring cell is lower than the third threshold and higher than the fourth threshold.

In an embodiment, the list of candidate cells is reported to the first network element through a measurement report or user assistance information UEAssistanceInformation.

In one embodiment, the detected entry into the marked area is triggered, and the list of candidate cells is reported to the first network element. The marked area is used to mark that the second network element actively sends candidate cells to the first network element when it enters the marked area in the connected mode. District list.

In one embodiment, the marked area is identified by one or more of the following methods:

Global cell identity code CGI logo;

Physical layer cell identity PCI;

Longitude and latitude coordinate information.

In a second aspect, the embodiment of the present application provides a method for determining a candidate cell, the method including:

Obtaining a list of candidate cells, the list of candidate cells includes information of one or more candidate cells;

A target candidate cell is determined according to the list of candidate cells. The target candidate cell is a cell to be handed over by the first network element, and the first network element and the second network element are network elements in the mobile communication network.

In a third aspect, the embodiment of the present application provides an apparatus for determining a candidate cell, the apparatus including:

An acquisition unit, configured to acquire a list of candidate cells, where the list of candidate cells includes cell identification information of one or more candidate cells;

The transceiver unit is configured to report a list of candidate cells to the first network element, the list of candidate cells is used to determine a target candidate cell, the target candidate cell is a cell to be handed over by the second network element, and the first network element and the second network element are A network element in a mobile communication network.

In a fourth aspect, the embodiment of the present application provides an apparatus for determining a candidate cell, which includes:

an obtaining unit, configured to obtain a list of candidate cells, the list of candidate cells includes information of one or more candidate cells;

The processing unit is configured to determine a target candidate cell according to the list of candidate cells. The target candidate cell is a cell to be handed over by the first network element, and the first network element and the second network element are network elements in the mobile communication network.

In a fifth aspect, an embodiment of the present application provides a communication device, including a processor and a memory, the memory is used to store a computer program, the computer program includes program instructions, the processor is configured to call the program instructions, and execute the communication device as described in the first aspect and The candidate cell determination method described in the second aspect.

In a sixth aspect, an embodiment of the present application provides a computer-readable storage medium. The computer-readable storage medium stores one or more instructions, and one or more instructions are suitable for being loaded and executed by a processor. The candidate cell determination method described in the second aspect.

In a seventh aspect, the embodiment of the present application provides a chip, wherein the chip is configured to execute the method for determining a candidate cell as described in the first aspect and the second aspect.

In the eighth aspect, the embodiment of the present application provides a chip module, which is characterized in that the chip module includes a storage device, a chip, and a communication interface, and the chip is used to execute the method for determining a candidate cell as described in the first aspect and the second aspect .

In the embodiment of the present application, the second network element may obtain a list of candidate cells, the list of candidate cells includes information of one or more candidate cells; report the list of candidate cells to the first network element, and the list of candidate cells is used to determine the target candidate cell , the target candidate cell is the cell to be handed over by the second network element, and the first network element and the second network element are network elements in the mobile communication network. Through this method, the number of selected cells during conditional handover can be reduced, and the signaling overhead of the Xn interface can be reduced.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present application more clearly, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application. Ordinary technicians can also obtain other drawings based on these drawings on the premise of not paying creative work.

FIG. 1 is a schematic diagram of an indoor and outdoor communication network architecture provided by an embodiment of the present application;

FIG. 2 is a schematic flowchart of a method for determining a candidate cell provided in an embodiment of the present application;

FIG. 3 is a schematic diagram of a CGI detection and reporting method provided by an embodiment of the present application;

FIG. 4 is a schematic flowchart of another method for determining a candidate cell provided in an embodiment of the present application;

FIG. 5 is a schematic diagram of units of an apparatus for determining a candidate cell provided in an embodiment of the present application;

FIG. 6 is a simplified schematic diagram of a physical structure of a communication device provided in an embodiment of the present application;

FIG. 7 is a simplified schematic diagram of a chip module provided by an embodiment of the present application.

Detailed ways

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present application as recited in the appended claims.

It should be noted that, in this document, the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a..." does not exclude the existence of other identical elements in the process, method, article, or device that includes the element. In addition, different implementations of the present application Components, features, and elements with the same name in the example may have the same meaning, or may have different meanings, and the specific meaning shall be determined based on the explanation in the specific embodiment or further combined with the context in the specific embodiment.

It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, the information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this document, first information may also be called second information, and similarly, second information may also be called first information. Depending on the context, the word "if" as used herein may be interpreted as "at" or "when" or "in response to a determination". Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms "comprising", "comprising" indicate the presence of stated features, steps, operations, elements, components, items, species, and/or groups, but do not exclude one or more other features, steps, operations, The existence, occurrence or addition of an element, component, item, species, and/or group. The terms "or" and "and/or" as used herein are to be construed as inclusive, or to mean either one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C" . Exceptions to this definition will only arise when combinations of elements, functions, steps or operations are inherently mutually exclusive in some way.

It should be understood that although the various steps in the flow chart in the embodiment of the present application are displayed sequentially as indicated by the arrows, these steps are not necessarily executed sequentially in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some of the steps in the figure may include multiple sub-steps or multiple stages, these sub-steps or stages are not necessarily executed at the same time, but may be executed at different times, and the execution order is not necessarily sequential Instead, it may be performed alternately or alternately with at least a part of other steps or sub-steps or stages of other steps.

It should be noted that in this article, step codes such as 110 and 120 are used for the purpose of expressing the corresponding content more clearly and concisely, and do not constitute a substantive limitation on the order. Those skilled in the art may, during specific implementation, First execute 120 and then execute 110, etc., but these should be within the protection scope of this application.

In the following description, the use of suffixes such as 'module', 'part' or 'unit' for denoting elements is only for facilitating the description of the present application and has no specific meaning by itself. Therefore, 'module', 'part' or 'unit' may be used in combination.

In order to better understand the embodiments of the present application, the following introduces the technical terms involved in the embodiments of the present application:

The conditional handover (Conditional Handover, CHO) is to let the terminal equipment select the target base station according to the measurement result and initiate the handover execution process. The terminal device can initiate a random access procedure to the target cell. This can avoid the failure of the terminal device to perform cell handover due to the change of the radio link state during the signaling interaction between the terminal device and the source base station and the signaling interaction between the source base station and the target base station. In this way, CHO improves the robustness during user switching.

The Access and Mobility Management Function (AMF) is the main functional unit of the 5G core network (5GC), which can complete the access and mobility management of terminal equipment, which is equivalent to the Mobility Management Entity (Mobility Management Entity, Part of the function of MME).

The session management function (Session Management Function, SMF) is an important functional unit of 5GC. It is responsible for processing user services. It can be regarded as the bearer management part of the MME, the serving gateway (Serving GateWay, SGW) and the PDN gateway (PDN GateWay, PGW). A combination of control plane functions.

Public Land Mobile Network (PLMN) is a network established and operated for the purpose of providing land mobile communication services for the public. This network is usually interconnected with the Public Switched Telephone Network (PSTN) to form a regional or national scale communication network.

In order to better understand the embodiment of the present application, the applicable network architecture of the embodiment of the present application will be described below.

Please refer to FIG. 1 . FIG. 1 is a schematic diagram of an indoor and outdoor communication network architecture provided by an embodiment of the present application. As shown in Figure 1, the communication network architecture is composed of outdoor and indoor network architectures. The outdoor network architecture includes the first network element, other network elements, and the second network element; the indoor network architecture includes indoor small base stations and the second network element. Two network elements. In addition, the first network element, other network elements and the indoor small base station can all communicate through a specific interface, such as an Xn interface, and they can all communicate with a core network (Core Net, CN).

Wherein, the first network element may be a network element in a mobile communication network, the first network element may be a serving cell (Serving Cell) where the second network element is located, and the first network element may be an outdoor macro station (Macro Base Station) The cell may also be a cell of an indoor small base station. The indoor small base station may be an access point (Access Point, AP) or the like. The outdoor macro base station or the indoor small base station can provide a wireless communication connection for the second network element through the serving cell. The second network element may be a terminal device, and the second network element may move between the cell of the indoor small base station and the cell of the outdoor macro base station. For example, the second network element may move from the cell of the indoor small base station to the cell of the outdoor macro base station.

In this embodiment of the application, there are two moving scenarios. One scenario is that the second network element moves from the cell of the outdoor macro base station to the cell of the indoor small base station; the second scenario is that the second network element moves from the cell of the indoor small base station The scenario where the cell moves to the cell of the outdoor macro station. The communication network architecture shown in Figure 1 takes the first scenario as an example, that is, the scenario where the second network element is handed over from the cell of the outdoor macro base station to the cell of the indoor small base station, and the corresponding method embodiment and the second mobility scenario The corresponding method embodiments are the same, and are not repeated in this embodiment of the present application.

It should be noted that the technical solution of the present invention is applicable to the 5th generation mobile communication (5th Generation, 5G) communication system, also applicable to 4G, 3G communication systems, and also applicable to various new communication systems in the future, such as 6G , 7G, in-vehicle short-distance communication system, etc. The technical solution of the present invention is also applicable to different network architectures, including but not limited to relay network architecture, dual link architecture, vehicle-to-everything communication architecture, in-vehicle short-distance communication architecture and other architectures.

The core network described in the embodiment of the present application may be an evolved packet core network (evolved packet core, EPC for short), a 5G Core Network (5G core network), or a new core network in a future communication system. 5G CoreNetwork consists of a group of devices, and implements access and mobility management functions (Access and Mobility Management Function, AMF) for mobility management functions, and provides user planes for packet routing and forwarding and QoS (Quality of Service) management functions. Function (User Plane Function, UPF), session management function (Session Management Function, SMF) that provides functions such as session management, IP address allocation and management, etc. EPC can be composed of MME that provides functions such as mobility management and gateway selection, Serving Gateway (S-GW) that provides functions such as data packet forwarding, and PDN Gateway (P-GW) that provides functions such as terminal address allocation and rate control.

The network device involved in the embodiment of the present application is an entity on the network side for transmitting or receiving signals, and can be used to convert received air frames and Internet Protocol (Internet Protocol, IP) packets to each other, as A router between an end device and the rest of the access network, which may include IP networks, etc. Access network devices can also coordinate attribute management for the air interface. For example, the access network device can be an eNB in LTE, or a New Radio Controller (NR controller), a gNB in a 5G system, a centralized network element (Centralized Unit), or a The new wireless base station can be a radio remote module, a micro base station, a relay (Relay), a distributed network element (Distributed Unit), a receiving point (Transmission Reception Point, TRP) or a transmission point ( Transmission Point, TP), may be a G node in the in-vehicle short-distance communication system or any other wireless access device, but this embodiment of the present application is not limited thereto.

A base station (base station, BS for short) in this embodiment of the present application may also be referred to as a base station device, and is a device deployed in a radio access network (RAN) to provide a wireless communication function. For example, the equipment providing base station function in 2G network includes base wireless transceiver station (English: base transceiver station, referred to as BTS), the equipment providing base station function in 3G network includes Node B (NodeB), and the equipment providing base station function in 4G network Including evolved NodeB (evolvedNodeB, eNB), in wireless local area networks (wireless local area networks, referred to as WLAN), the device that provides the base station function is an access point (access point, referred to as AP), 5G new wireless (New Radio, The device gNB that provides base station functions in NR for short, and the node B (ng-eNB) that continues to evolve, in which gNB and the terminal use NR technology for communication, and the ng-eNB and the terminal use E-UTRA (Evolved Universal Terrestrial Radio Access) technology for communication, both gNB and ng-eNB can be connected to the 5G core network. The base station in the embodiment of the present application also includes devices that provide base station functions in future new communication systems, and the like.

The base station controller in the embodiment of the present application is a device for managing base stations, such as a base station controller (BSC for short) in a 2G network and a radio network controller (radio network controller, RNC for short) in a 3G network. , It can also refer to the device that controls and manages the base station in the new communication system in the future.

The network-side network in the embodiment of the present invention refers to a communication network that provides communication services for terminals, including a base station of a wireless access network, a base station controller of the wireless access network, and equipment on the core network side.

The embodiment of this application defines the one-way communication link from the access network to the terminal as the downlink, the data transmitted on the downlink is downlink data, and the transmission direction of the downlink data is called the downlink direction; The one-way communication link is an uplink, the data transmitted on the uplink is uplink data, and the transmission direction of the uplink data is called the uplink direction.

The terminal in the embodiment of the present application may refer to various forms of user equipment (user equipment, UE for short), access terminal, user unit, user station, mobile station, mobile station (mobile station, built as MS), remote station, remote Terminal, mobile device, user terminal, terminal equipment, wireless communication device, user agent, or user device. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP for short) phone, a Wireless Local Loop (WLL for short) station, a Personal Digital Assistant (PDA for short), a Handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminal devices in the future 5G network or future evolution of the Public Land Mobile Network (PLMN for short) ), etc., which are not limited in this embodiment of the present application.

In order to reduce the number of candidate cells and reduce the signaling overhead of the Xn interface, the embodiment of the present application provides a method and device for determining a candidate cell. The method and device for determining a candidate cell provided in the embodiment of the present application are further introduced in detail below.

Please refer to FIG. 2 . FIG. 2 is a schematic flowchart of a method for determining a candidate cell according to an embodiment of the present application. The method for determining a candidate cell includes the following operations 210 to 220 . The execution subject of the method shown in FIG. 2 may be the second network element, or a chip in the second network element. When the second network element executes the process shown in Figure 2, the following steps may be included:

210. Acquire a candidate cell list, where the candidate cell list includes cell identification information of one or more candidate cells.

Specifically, the candidate cell list may be determined by the second network element in one or more of the following ways:

Optionally, the list of candidate cells may be determined according to historical handover records, where the historical handover records include historical cell handover information, where the historical cell handover information is cell information of cells that the second network element has accessed after performing cell handover . Each cell in the historical handover record may be determined by the second network element through a cell handover procedure, or may be determined through a CHO method. The number of cells in the historical handover record may be one or more, and the second network element may obtain the cell representation information of each cell to obtain the candidate cell list.

Optionally, the list of candidate cells may be determined according to core network assisted radio access network (Radio AccessNetwork, RAN) parameter tuning (Core Network assisted RAN parameters tuning), the core network assisted RAN parameter tuning is the core It is sent offline to the second NE. The RAN parameter tuning assisted by the core network is to assist the RAN side to minimize the state transition of the second network element and optimize the network behavior of the second network element. The RAN parameter tuning assisted by the core network may be obtained from an Access and Mobility Management Function (Access and Mobility Management Function, AMF), and may also be obtained from a Session Management Function (Session Management Function, SMF).

Wherein, the AMF may be based on the collected behavior statistics data of the second network element, the expected behavior of the second network element and/or other available information of the second network element, such as the subscribed data network name (DataNetwork Name, DNN), User Permanent Identifier (Subscription Permanent Identifier, SUPI) range and other information) to derive core network-assisted RAN parameter tuning. If the expected behavior parameters of the second network element, network configuration parameters, or core network-assisted RAN parameter tuning derived from the SMF are maintained in the AMF, the AMF can use these information to select the core network-assisted RAN parameter tuning. If the AMF can derive the mobility pattern (Mobility Pattern) of the second network element, then the AMF can consider the mobility pattern parameter when determining core network-assisted RAN parameter optimization.

The SMF may use the parameters assisted by the SMF to derive core network assisted tuning of RAN parameters, such as desired behavior parameters of the second network element or network configuration parameters of the second network element. The SMF may send the derived core network-assisted RAN parameter tuning to the AMF, and the AMF stores the core network-assisted RAN parameter tuning as a protocol data unit (Protocol Data Unit, PDU) session (session) level context.

Optionally, one or more of the following information may be determined according to core network-assisted RAN parameter tuning:

Expected handover (Handover, HO) behavior (Expected HO behavior); for example, an expected handover interval of the second network element between RANs (inter-RAN).

The expected mobility of the second network element (Expected UE mobility) is used to predict whether the second network element is mobile or stationary.

The expected moving trajectory of the second network element (Expected UE moving trajectory), the information may be derived from statistical information, behavior parameters of the expected second network element, or subscription information.

Optionally, the candidate cell list may be derived by the AMF or SMF based on the RAN parameter optimization assisted by the core network, and sent to the second network element by the AMF or SMF when the PDU session is established or modified.

Optionally, the candidate cell list may be determined according to an automatic neighbor relation (Automatic NeighborRelation, ANR) function, and the ANR function is used for the first network element to determine the neighbor relation. That is to say, the first network element may obtain the list of candidate cells from surrounding network devices through the ANR function. Furthermore, the first network element may send the candidate cell list to the second network element.

The automatic neighbor relationship function manages the neighbor relationship list. In the ANR function, there are both the neighbor detection function and the neighbor deletion function. Among them, the neighbor cell detection function is used to find the neighbor cell and add the neighbor cell to the neighbor cell relationship list, the neighbor cell deletion function is used to delete the outdated neighbor cell relationship; the neighbor cell deletion function is an internal behavior of the base station, The neighboring cell detection function needs to be completed through interaction between the base station and the terminal equipment. In practical applications, the ANR function realizes the addition and management of the neighbor cell relationship by detecting and reporting the global cell identifier (Cell Global Identifier, CGI) of the target cell.

Figure 3 is a schematic diagram of a CGI detection and reporting method. Figure 3 takes the second network element handover from an indoor small base station to an outdoor macro base station as an example, and the target cell may be a serving cell of the outdoor macro base station. The number of outdoor macro stations may be one or more, which is not limited in this embodiment of the present application. In FIG. 3 , the second network element sends a measurement report related to the target cell to the indoor small base station. The measurement report includes the physical cell identifier (Physical Cell Identifier, PCI) of the target cell, but the measurement report does not include CGI. After the indoor small base station receives the measurement report containing the PCI of the target cell sent by the second network element, the indoor small base station can send indication information to the second network element, and the indication information can instruct the second network element to read the PCI corresponding The CGI information of the cell, that is, read the CGI information of the target cell. The second network element may acquire CGI information corresponding to the target cell through a broadcast control channel (Broadcast Control Channel, BCCH). When the second network element acquires the CGI of the target cell, the second network element may report the detected CGI of the target cell to the indoor small base station. The indoor small base station determines the newly discovered neighbor cell according to the CGI information of the target cell, that is, when the target cell is not in the neighbor cell list, it adds the target cell to the neighbor cell relationship list, thereby completing the ANR function.

Optionally, the service modes supported by the candidate cells in the candidate cell list include but not limited to the following two working modes: Mode 1 and Mode 2. Among them, the cell whose working mode is Mode 1 allows the second network element that has signed up for the cell to access; the cell whose working mode is Mode 2 can allow subscribers and non-subscribed second network elements, and can provide subscribers with more High access level and faster service rate, etc.

Optionally, the cell identity information may be a physical layer cell identity (Physical Cell Identifier, PCI), a cell global identity (Cell Global Identifier, CGI), and the like.

After the second network element obtains the list of candidate cells, it may save it in a first memory, and the first memory may be a memory in the second network element.

220. Report a candidate cell list to the first network element, the candidate cell list is used to determine a target candidate cell, the target candidate cell is a cell for which the second network element is to perform conditional handover, and the first network element and the second network element are A network element in a mobile communication network.

In a possible implementation manner, reporting the candidate cell list to the first network element may be implemented by triggering a measurement event. The second network element may trigger a measurement event and report the list of candidate cells to the first network element. Wherein, the measurement event may include one or more of the following time periods:

A2 event, where the A2 event is used to indicate that the signal quality of the serving cell is lower than the first threshold;

A3 event, where the A3 event is used to indicate that the signal quality offset of the neighboring cell is higher than the signal quality of the serving cell;

A4 event, where the A4 event is used to indicate that the signal quality of the neighboring cell is higher than the second threshold;

A5 event, where the A5 event is used to indicate that the signal quality of the neighboring cell is lower than the third threshold and higher than the fourth threshold.

Wherein, the serving cell refers to a cell that is providing communication services for the second network element, and the neighboring cell refers to a cell adjacent to the serving cell. The first threshold, the second threshold, the third threshold, and the fourth threshold may be configured by the network device, which is not limited in this embodiment of the present application.

In a possible implementation manner, reporting the list of candidate cells to the first network element may be implemented by triggering a detected entry into a marked area. The second network element can trigger the detected entry into the marked area, and report the list of candidate cells to a network element. The marked area is used to mark the second network element to actively send candidate cells to the first network element when it enters the marked area in the connection mode. list.

Optionally, the marked area can be identified by one or more of the following methods:

Global cell identity code CGI logo;

Physical layer cell identity PCI;

Longitude and latitude coordinate information.

Wherein, the locally stored candidate cell list in the second network element is associated with the marked area, and may have a one-to-one correspondence.

Optionally, the second network element reports the list of candidate cells to the first network element through a measurement report or user assistance information (UEAssistanceInformation).

Optionally, reporting through the measurement report can be implemented by adding information elements (InformationElements, IE) in the measurement report, for example, by adding information elements of the candidate cell list Optionally, the candidate cell list can include one of the following information or more:

Cell identification information corresponding to each candidate cell in the candidate cell list;

The working mode of each candidate cell in the candidate cell list;

PLMN IDs of public land mobile network identifiers to which each candidate cell in the candidate cell list belongs;

The tracking area code of each candidate cell in the candidate cell list is TAC, where TA is a tracking area (Tracking Area, TA), and the tracking area is an area used for paging and location update.

Through this embodiment of the present application, the second network element can acquire a candidate cell list, and the candidate cell list can include information such as cell identification information, working mode, PLMN ID, and TAC corresponding to each candidate cell in the candidate cell list. The solution of this application is aimed at the indoor-to-outdoor or outdoor-to-indoor cell handover scenario. In this type of scenario, the cells where the second network element performs cell handover are usually fewer and relatively fixed. For example, the second network element may switch from an indoor small base station to a specific outdoor macro base station, or from an outdoor macro base station to a specific indoor small base station. It is not necessary to use cells that cover the vicinity of the room as cells in the candidate cell list, but the network side determines the candidate cells according to specific parameters. Through this method, the number of selected cells during conditional handover is reduced, and the signaling overhead of the Xn interface is also reduced.

Please refer to FIG. 4 . FIG. 4 provides a schematic flowchart of another method for determining a candidate cell according to an embodiment of the present application. The method for determining a candidate cell includes the following operations 410 to 420 . The execution subject of the method shown in FIG. 4 may be the first network element, or a chip corresponding to the first network element. When the first network element executes the process shown in Figure 4, the following steps may be included:

410. Acquire a candidate cell list, where the candidate cell list includes information about one or more candidate cells.

Wherein, the candidate cell list may be reported by the second network element, and the candidate cell list may include one or more of the following information:

Cell identification information corresponding to each candidate cell in the candidate cell list;

The working mode of each candidate cell in the candidate cell list;

PLMN IDs of public land mobile network identifiers to which each candidate cell in the candidate cell list belongs;

The tracking area code TAC of each candidate cell in the candidate cell list.

Optionally, reporting the candidate cell list to the first network element by the second network element may be implemented by triggering a measurement event.

Optionally, reporting the candidate cell list to the first network element by the second network element may be implemented by triggering a detected entry into a marked area.

Optionally, the second network element reports the list of candidate cells to the first network element through a measurement report or user assistance information (UEAssistanceInformation).

Optionally, the first network element may save the candidate cell list in a second memory, and the first memory may be a memory in the first network element. It should be noted that each candidate cell and the second network element in the candidate cell list may store the candidate cell list.

420. Determine a target candidate cell according to the candidate cell list, where the target candidate cell is a cell where the first network element is to perform conditional handover, and the first network element and the second network element are network elements in the mobile communication network.

The first network element may determine the target candidate cell according to the candidate cell list, and the specific determination method is not limited in this embodiment of the present application.

Optionally, if the first network element is connected to the second network element through a cell whose working mode is Mode 1, the candidate cell to be handed over in the second network element is configured as a cell in the candidate cell list.

Optionally, if the first network element is connected to multiple second network elements through a cell whose working mode is Mode 2, configure is a cell in the candidate cell list.

Through this embodiment of the present application, the first network element may acquire a candidate cell list, and the candidate cell list may include information such as cell identification information, working mode, PLMN ID, and TAC corresponding to each candidate cell in the candidate cell list. Furthermore, the first network element may determine the target candidate cell according to the list of candidate cells. Wherein, the number of candidate cells in the candidate cell list is small and relatively fixed, which reduces the number of candidate cells in the selected cell list during conditional handover, and reduces the signaling overhead of the Xn interface.

Please refer to FIG. 5 . FIG. 5 is a schematic diagram of units of an apparatus for determining a candidate cell provided in an embodiment of the present application. The apparatus for determining a candidate cell shown in FIG. 5 may be used to perform some or all of the functions in the method embodiments described in FIG. 2 and FIG. 4 above. The device may be the second network element, or a device in the second network element, or a device that can be matched and used with the second network element. The device may also be a device corresponding to the first network element, or a device in the device corresponding to the first network element, or a device that can be matched and used with the device corresponding to the first network element. Wherein, the first network element may be a serving cell in the network device, and the second network element may be a terminal device.

The logical structure of the device may include: an acquisition unit 510, a transceiver unit 520, and a processing unit 530, wherein, when the device is applied to a second network element:

An acquisition unit 510, configured to acquire a list of candidate cells, where the list of candidate cells includes cell identification information of one or more candidate cells;

The transceiver unit 520 is configured to report a list of candidate cells to the first network element, the list of candidate cells is used to determine a target candidate cell, the target candidate cell is a cell to be handed over by the second network element, the first network element and the second network element It is a network element in a mobile communication network.

In a possible implementation manner, the candidate cell list includes one or more of the following information:

Cell identification information corresponding to each candidate cell in the candidate cell list;

The working mode of each candidate cell in the candidate cell list;

PLMN IDs of public land mobile network identifiers to which each candidate cell in the candidate cell list belongs;

The tracking area code TAC of each candidate cell in the candidate cell list.

In a possible implementation manner, the candidate cell list is determined according to one or more of the following methods:

Determined according to the historical handover record, the historical handover record includes historical cell handover information, and the historical cell handover information is the cell information of the cell that the second network element has accessed after the cell handover; or,

Determined according to the core network-assisted radio access network RAN parameter tuning, the core network-assisted radio access network RAN parameter tuning is delivered by the core network to the second network element; or,

Determined according to the automatic neighbor relationship, where the automatic neighbor relationship is used by the first network element to determine the neighbor relationship.

In a possible implementation manner, a measurement event is triggered, and the transceiver unit 520 is further configured to report a list of candidate cells to the first network element;

In a possible implementation manner, the measurement event includes one or more of the following events:

A2 event, the A2 event is used to indicate that the signal quality of the serving cell is lower than the first threshold;

A3 event, the A3 event is used to indicate that the signal quality offset of the neighboring cell is higher than the signal quality of the serving cell;

A4 event, the A4 event is used to indicate that the signal quality of the neighboring cell is higher than the second threshold;

A5 event, the A5 event is used to indicate that the signal quality of the neighboring cell is lower than the third threshold and higher than the fourth threshold.

In a possible implementation manner, the transceiving unit 520 is further configured to report the list of candidate cells to the first network element through a measurement report or user assistance information UEAssistanceInformation.

In a possible implementation manner, the detected entry into the marked area is triggered, and the transceiver unit 520 is further configured to report the list of candidate cells to the first network element, and the marked area is used to mark the second network element entering the marked area in the connected mode. actively send the list of candidate cells to the first network element.

In a possible implementation manner, the marking area is identified by one or more of the following methods:

Global cell identity code CGI logo;

Physical layer cell identity PCI;

Longitude and latitude coordinate information.

When the device is applied to the equipment corresponding to the first network element:

An acquisition unit 510, configured to acquire a list of candidate cells, where the list of candidate cells includes information about one or more candidate cells;

The processing unit 530 is configured to determine a target candidate cell according to the list of candidate cells, where the target candidate cell is a cell to be handed over by the first network element, and the first network element and the second network element are network elements in the mobile communication network.

Please refer to FIG. 6. FIG. 6 is a simplified schematic diagram of a physical structure of a communication device provided by an embodiment of the present application. The communication device includes a processor 610, a memory 620, and a communication interface 630. The processor 610, memory 620, and communication interface 630 Connected via one or more communication buses. The communication device may be a chip, or a chip module or the like.

The processor 610 is configured to support the communication device to execute the functions corresponding to the above methods in FIG. 2 and FIG. 3 . It should be understood that, in the embodiment of the present application, the processor 610 may be a central processing unit (central processing unit, referred to as CPU), and the processor may also be other general-purpose processors, digital signal processors (digital signal processor, referred to as DSP) ), application specific integrated circuit (ASIC for short), off-the-shelf programmable gate array (field programmable gate array, FPGA for short) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like.

The memory 620 is used to store program codes and the like. The memory 620 in the embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Wherein, the non-volatile memory can be read-only memory (read-only memory, referred to as ROM), programmable read-only memory (programmable ROM, referred to as PROM), erasable programmable read-only memory (erasable PROM, referred to as EPROM) , Electrically Erasable Programmable Read-Only Memory (electrically EPROM, EEPROM for short) or flash memory. The volatile memory may be random access memory (RAM for short), which acts as an external cache. By way of illustration and not limitation, many forms of random access memory (RAM) are available, such as static random access memory (static RAM (SRAM), dynamic random access memory (DRAM), synchronous Dynamic random access memory (synchronous DRAM, referred to as SDRAM), double data rate synchronous dynamic random access memory (double datarate SDRAM, referred to as DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, referred to as ESDRAM), synchronous A dynamic random access memory (synchlink DRAM, SLDRAM for short) and a direct memory bus random access memory (direct rambus RAM, DR RAM for short) are connected.

The communication interface 630 is used to send and receive data, information or messages, etc., and may also be described as a transceiver, a transceiver circuit, and the like.

In the embodiment of the present application, when the communication device is the second network element, the processor 610 calls the program code stored in the memory 620 to perform the following operations:

The processor 610 calls the program code stored in the memory 620 to obtain a candidate cell list, and the candidate cell list includes cell identification information of one or more candidate cells;

The control communication interface 630 reports a list of candidate cells to the first network element. The list of candidate cells is used to determine a target candidate cell. The target candidate cell is a cell to be handed over by the second network element. A network element in a communication network.

In a possible implementation manner, the candidate cell list includes one or more of the following information:

Cell identification information corresponding to each candidate cell in the candidate cell list;

The working mode of each candidate cell in the candidate cell list;

PLMN IDs of public land mobile network identifiers to which each candidate cell in the candidate cell list belongs;

The tracking area code TAC of each candidate cell in the candidate cell list.

In a possible implementation manner, the candidate cell list is determined according to one or more of the following methods:

Determined according to the historical handover record, the historical handover record includes historical cell handover information, and the historical cell handover information is the cell information of the cell that the second network element has accessed after the cell handover; or,

Determined according to the core network-assisted radio access network RAN parameter tuning, the core network-assisted radio access network RAN parameter tuning is delivered by the core network to the second network element; or,

Determined according to the automatic neighbor relationship, where the automatic neighbor relationship is used by the first network element to determine the neighbor relationship.

In a possible implementation manner, a measurement event is triggered, and the communication interface 630 is controlled to report the list of candidate cells to the first network element;

In a possible implementation manner, the measurement event includes one or more of the following events:

A2 event, the A2 event is used to indicate that the signal quality of the serving cell is lower than the first threshold;

A3 event, the A3 event is used to indicate that the signal quality offset of the neighboring cell is higher than the signal quality of the serving cell;

A4 event, the A4 event is used to indicate that the signal quality of the neighboring cell is higher than the second threshold;

A5 event, the A5 event is used to indicate that the signal quality of the neighboring cell is lower than the third threshold and higher than the fourth threshold.

In a possible implementation manner, the control communication interface 630 reports the candidate cell list to the first network element through a measurement report or user assistance information UEAssistanceInformation.

In a possible implementation, the detected entry into the marked area is triggered, and the communication interface 630 is controlled to report the list of candidate cells to the first network element. The marked area is used to mark the second network element to actively enter the marked area in the connected mode. Send the candidate cell list to the first network element.

In a possible implementation manner, the marking area is identified by one or more of the following methods:

Global cell identity code CGI logo;

Physical layer cell identity PCI;

Longitude and latitude coordinate information.

When the communication device is a device corresponding to the first network element:

The processor 610 calls the program code stored in the memory 620 to obtain a candidate cell list, and the candidate cell list includes information of one or more candidate cells;

The processor 610 invokes the program code stored in the memory 620 to determine the target candidate cell according to the candidate cell list, the target candidate cell is the cell where the first network element is to be handed over conditionally, and the first network element and the second network element are mobile communication network elements. network element.

The embodiment of the present application also provides a chip, and the chip may also be included in a chip module.

When the chip is applied to the second network element:

The chip is used to obtain a candidate cell list, and the candidate cell list includes cell identification information of one or more candidate cells;

The chip is also used to trigger the reporting of the list of candidate cells to the first network element. The list of candidate cells is used to determine the target candidate cell. The target candidate cell is the cell to be handed over by the second network element. The first network element and the second network element It is a network element in a mobile communication network.

In a possible implementation manner, the candidate cell list includes one or more of the following information:

Cell identification information corresponding to each candidate cell in the candidate cell list;

The working mode of each candidate cell in the candidate cell list;

PLMN IDs of public land mobile network identifiers to which each candidate cell in the candidate cell list belongs;

The tracking area code TAC of each candidate cell in the candidate cell list.

In a possible implementation manner, the candidate cell list is determined according to one or more of the following methods:

Determined according to the historical handover record, the historical handover record includes historical cell handover information, and the historical cell handover information is the cell information of the cell that the second network element has accessed after the cell handover; or,

Determined according to the core network-assisted radio access network RAN parameter tuning, the core network-assisted radio access network RAN parameter tuning is delivered by the core network to the second network element; or,

Determined according to the automatic neighbor relationship, where the automatic neighbor relationship is used by the first network element to determine the neighbor relationship.

In a possible implementation manner, triggering a measurement event, the chip is also used to trigger reporting of the list of candidate cells to the first network element;

In a possible implementation manner, the measurement event includes one or more of the following events:

A2 event, the A2 event is used to indicate that the signal quality of the serving cell is lower than the first threshold;

A3 event, the A3 event is used to indicate that the signal quality offset of the neighboring cell is higher than the signal quality of the serving cell;

A4 event, the A4 event is used to indicate that the signal quality of the neighboring cell is higher than the second threshold;

A5 event, the A5 event is used to indicate that the signal quality of the neighboring cell is lower than the third threshold and higher than the fourth threshold.

In a possible implementation manner, the chip is further configured to trigger reporting of the candidate cell list to the first network element through a measurement report or user assistance information UEAssistanceInformation.

In a possible implementation, triggering the detected entry into the marked area, the chip is also used to trigger the reporting of the candidate cell list to the first network element, and the marked area is used to mark the second network element entering the marked area in the connection mode actively send the list of candidate cells to the first network element.

In a possible implementation manner, the marking area is identified by one or more of the following methods:

Global cell identity code CGI logo;

Physical layer cell identity PCI;

Longitude and latitude coordinate information.

When the device is applied to the equipment corresponding to the first network element:

The chip is also used to obtain a list of candidate cells, and the list of candidate cells contains information of one or more candidate cells;

The chip is also used to determine the target candidate cell according to the list of candidate cells. The target candidate cell is the cell to be handed over by the first network element, and the first network element and the second network element are network elements in the mobile communication network.

Please refer to FIG. 7. FIG. 7 is a simplified schematic diagram of a chip module provided by an embodiment of the present application. The chip module includes a storage device 710, a chip 720, and a communication interface 730. When the chip module is applied to the second network element when, where:

The chip 720 is used to obtain a candidate cell list, and the candidate cell list includes cell identification information of one or more candidate cells;

The chip 720 is also used to trigger the communication interface 730 to report the list of candidate cells to the first network element. The list of candidate cells is used to determine the target candidate cell. The target candidate cell is the cell to be handed over by the second network element. The first network element and The second network element is a network element in a mobile communication network.

In a possible implementation manner, the candidate cell list includes one or more of the following information:

Cell identification information corresponding to each candidate cell in the candidate cell list;

The working mode of each candidate cell in the candidate cell list;

PLMN IDs of public land mobile network identifiers to which each candidate cell in the candidate cell list belongs;

The tracking area code TAC of each candidate cell in the candidate cell list.

In a possible implementation manner, the candidate cell list is determined according to one or more of the following methods:

Determined according to the historical handover record, the historical handover record includes historical cell handover information, and the historical cell handover information is the cell information of the cell that the second network element has accessed after the cell handover; or,

Determined according to the core network-assisted radio access network RAN parameter tuning, the core network-assisted radio access network RAN parameter tuning is delivered by the core network to the second network element; or,

Determined according to the automatic neighbor relationship, where the automatic neighbor relationship is used by the first network element to determine the neighbor relationship.

In a possible implementation manner, triggering a measurement event, the chip 720 is also used to trigger the communication interface 730 to report the list of candidate cells to the first network element;

In a possible implementation manner, the measurement event includes one or more of the following events:

A2 event, the A2 event is used to indicate that the signal quality of the serving cell is lower than the first threshold;

A3 event, the A3 event is used to indicate that the signal quality offset of the neighboring cell is higher than the signal quality of the serving cell;

A4 event, the A4 event is used to indicate that the signal quality of the neighboring cell is higher than the second threshold;

A5 event, the A5 event is used to indicate that the signal quality of the neighboring cell is lower than the third threshold and higher than the fourth threshold.

In a possible implementation manner, the chip 720 is also configured to trigger the communication interface 730 to report the candidate cell list to the first network element through a measurement report or user assistance information UEAssistanceInformation.

In a possible implementation, the chip 720 is also used to trigger the communication interface 730 to report the list of candidate cells to the first network element when the detected entry into the marked area is triggered, and the marked area is used to mark the second network element in the connection mode When entering the marked area, actively send the list of candidate cells to the first network element.

In a possible implementation manner, the marking area is identified by one or more of the following methods:

Global cell identity code CGI logo;

Physical layer cell identity PCI;

Longitude and latitude coordinate information.

When the device is applied to the equipment corresponding to the first network element:

The chip 720 is also used to obtain a list of candidate cells, and the list of candidate cells includes information of one or more candidate cells;

The chip 720 is also used to determine the target candidate cell according to the list of candidate cells. The target candidate cell is the cell to be handed over by the first network element, and the first network element and the second network element are network elements in the mobile communication network.

It should be noted that, in the foregoing embodiments, descriptions of each embodiment have their own emphases, and for parts that are not described in detail in a certain embodiment, reference may be made to relevant descriptions of other embodiments.

The steps in the methods of the embodiments of the present invention can be adjusted, combined and deleted according to actual needs.

The units in the processing device in the embodiment of the present invention can be combined, divided and deleted according to actual needs.

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part. A computer can be a general purpose computer, special purpose computer, a computer network, or other programmable apparatus. Computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, e.g. Coaxial cable, optical fiber, digital subscriber line) or wireless (such as infrared, wireless, microwave, etc.) to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server, a data center, etc. integrated with one or more available media. Usable media may be magnetic media, (eg, floppy disk, memory disk, magnetic tape), optical media (eg, DVD), or semiconductor media (eg, Solid State Disk (SSD)), among others.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit it; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present application. scope.

Claims (13)

1. A method for determining a candidate cell, comprising: Obtaining a list of candidate cells, the list of candidate cells includes information of one or more candidate cells; reporting the list of candidate cells to the first network element, the list of candidate cells is used to determine a target candidate cell, the target candidate cell is a cell to be handed over by the second network element, and the first network element and the The second network element is a network element in a mobile communication network. 2. The method according to claim 1, wherein the candidate cell list includes one or more of the following information: Cell identification information corresponding to each candidate cell in the candidate cell list; The working mode of each candidate cell in the candidate cell list; PLMN IDs of public land mobile network identifiers to which each candidate cell in the candidate cell list belongs; The tracking area code TAC of each candidate cell in the candidate cell list. 3. The method of claim 1, wherein, The candidate cell list is determined according to one or more of the following methods: Determined according to the historical handover record, the historical handover record includes historical cell handover information, and the historical cell handover information is the cell information of the cell that the second network element has accessed after the cell handover; or, Determined according to core network-assisted radio access network RAN parameter tuning, where the core network-assisted radio access network RAN parameter tuning is issued by the core network to the second network element; or, Determined according to the automatic neighbor relationship, where the automatic neighbor relationship is used for the first network element to determine the neighbor relationship. 4. The method according to claim 1, wherein the reporting the list of candidate cells to the first network element comprises: triggering a measurement event, and reporting the list of candidate cells to the first network element; The measurement events include one or more of the following events: A2 event, where the A2 event is used to indicate that the signal quality of the serving cell is lower than the first threshold; A3 event, the A3 event is used to indicate that the signal quality offset of the neighboring cell is higher than the signal quality of the serving cell; A4 event, the A4 event is used to indicate that the signal quality of the neighboring cell is higher than the second threshold; A5 event, where the A5 event is used to indicate that the signal quality of the neighboring cell is lower than the third threshold and higher than the fourth threshold. 5. The method according to claim 1 or 4, wherein the reporting the list of candidate cells to the first network element comprises: Reporting the list of candidate cells to the first network element through a measurement report or user assistance information UEAssistanceInformation. 6. The method according to claim 1, wherein the reporting the list of candidate cells to the first network element comprises: Triggering the detected entry into the marked area, reporting the list of candidate cells to the first network element, the marked area is used to mark the second network element to actively report to the first network element when entering the marked area in connection mode Send a list of candidate cells. 7. The method according to claim 6, characterized in that: The marked area is identified by one or more of the following methods: Global cell identity code CGI logo; Physical layer cell identity PCI; Longitude and latitude coordinate information. 8. A method for determining a candidate cell, comprising: Obtaining a list of candidate cells, the list of candidate cells includes information of one or more candidate cells; A target candidate cell is determined according to the candidate cell list, the target candidate cell is a cell to be handed over by a first network element, and the first network element and the second network element are network elements in a mobile communication network. 9. A device for determining a candidate cell, comprising: an obtaining unit, configured to obtain a list of candidate cells, the list of candidate cells including information of one or more candidate cells; a transceiver unit, configured to report the list of candidate cells to the first network element, the list of candidate cells is used to determine a target candidate cell, the target candidate cell is a cell to be handed over by the second network element, and the first The network element and said second network element are network elements in a mobile communication network. 10. A communication device, characterized in that it includes a processor and a memory, the memory is used to store a computer program, the computer program includes program instructions, the processor is configured to call the program instructions, and execute as The method for determining a candidate cell according to any one of claims 1 to 8, or performing the method for determining a candidate cell according to claim 9. 11. A computer-readable storage medium, characterized in that the computer-readable storage medium stores one or more instructions, and the one or more instructions are suitable for being loaded and executed by a processor as claimed in claims 1 to 8 The method for determining a candidate cell according to any one of the above, or performing the method for determining a candidate cell according to claim 9 . 12. A chip, characterized in that the chip is used to execute the method for determining a candidate cell according to any one of claims 1 to 8. 13. A chip module, characterized in that the chip module includes a storage device, a chip, and a communication interface, and the chip is used to execute the candidate cell determination method according to any one of claims 1 to 8, Or execute the method for determining a candidate cell as claimed in claim 9.

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