CN115314955A - Method, device, equipment, medium and chip for determining candidate cell - Google Patents
Method, device, equipment, medium and chip for determining candidate cell Download PDFInfo
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Abstract
The application discloses a method, a device, equipment, a medium and a chip for determining a candidate cell, wherein the method comprises the following steps: acquiring a candidate cell list, wherein the candidate cell list comprises cell identification information of one or more candidate cells; and reporting a candidate cell list to a first network element, wherein the candidate cell list is used for determining a target candidate cell, the target candidate cell is a cell to be subjected to conditional handover by a second network element, and the first network element and the second network element are network elements in a mobile communication network. By the method, the number of candidate cells during condition switching can be reduced, and the signaling overhead of an Xn interface is reduced.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method, an apparatus, a device, a medium, and a chip for determining a candidate cell.
Background
In a New Radio (NR) system of 5G, a terminal device (UE) may perform cell switching between an indoor small Base Station and an outdoor Macro Station (Macro Base Station). That is, the terminal device may be handed over from the indoor small base station to the outdoor macro station, or from the outdoor macro station to the indoor small base station.
Currently, the base station Handover can be realized by a Conditional Handover (CHO) method. In the current CHO, the source base station determines the candidate cells of the CHO according to the measurement result reported by the UE, and the source base station sends a CHO request to all the candidate cells to request all the candidate cells to configure the radio side configuration of the candidate cells and the execution condition of the CHO. And the measurement result of the UE is carried out according to the measurement event configured by the base station. The measurement time generally refers to an A3 event, where the offset of a neighboring cell exceeds a cell (i.e., a cell of a source base station) to which the terminal device is connected, and the neighboring cell and the cell to which the terminal device is connected may belong to different base stations.
How to determine candidate cells for a terminal device when performing conditional handover becomes a hot issue of research.
Disclosure of Invention
The application discloses a method, a device, equipment, a medium and a chip for determining candidate cells, which can reduce the number of candidate cells during condition switching and reduce the signaling overhead of an Xn interface.
In a first aspect, an embodiment of the present application provides a method for determining a candidate cell, where the method includes:
acquiring a candidate cell list, wherein the candidate cell list comprises information of one or more candidate cells;
and reporting a candidate cell list to a first network element, wherein the candidate cell list is used for determining a target candidate cell, the target candidate cell is a cell to be subjected to conditional handover by a second network element, and the first network element and the second network element are network elements in a mobile communication network.
In an embodiment, the candidate cell list comprises one or more of the following information:
cell identification information corresponding to each candidate cell in the candidate cell list;
the operating mode of each candidate cell in the candidate cell list;
each candidate cell in the candidate cell list is respectively belonged to a public land mobile network identification PLMN ID;
the tracking area code TAC of each candidate cell in the candidate cell list.
In an embodiment, the candidate cell list is determined according to one or more of the following ways:
the historical switching record comprises historical cell switching information which is determined according to the historical switching record, and the historical cell switching information is cell information of a cell accessed by the second network element after cell switching is carried out; or,
the RAN parameter optimization assisted by the core network is sent to a second network element by the core network according to the RAN parameter optimization assisted by the core network; or,
the automatic neighbor relation is determined according to the automatic neighbor relation, and the automatic neighbor relation is used for the first network element to determine the neighbor relation.
In one embodiment, a measurement event is triggered, and a candidate cell list is reported to a first network element;
in one embodiment, the measurement events include one or more of the following events:
an A2 event, the A2 event being used to indicate that the signal quality of the serving cell is below a first threshold;
an A3 event, the A3 event being used to indicate that the signal quality offset of the neighbor cell is higher than the signal quality of the serving cell;
an A4 event, wherein the A4 event is used for indicating that the signal quality of the adjacent cell is higher than a second threshold value;
and an A5 event, wherein the A5 event is used for indicating that the signal quality of the neighbor 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 by a measurement report or user assistance information UEAssistanceInformation.
In an embodiment, the detected entering marking area is triggered, and a candidate cell list is reported to the first network element, where the marking area is used to mark that the second network element actively sends the candidate cell list to the first network element when entering the marking area in the connection mode.
In one embodiment, the marking zone is identified by one or more of:
a global cell identity Code (CGI) identifier;
physical layer cell identity PCI;
latitude and longitude coordinate information.
In a second aspect, an embodiment of the present application provides a method for determining a candidate cell, where the method includes:
acquiring a candidate cell list, wherein the candidate cell list comprises information of one or more candidate cells;
and determining a target candidate cell according to the candidate cell list, wherein the target candidate cell is a cell to be subjected to conditional handover 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, an embodiment of the present application provides an apparatus for determining a candidate cell, where the apparatus includes:
an obtaining unit, configured to obtain a candidate cell list, where the candidate cell list includes cell identification information of one or more candidate cells;
a transceiver unit, configured to report a candidate cell list to a first network element, where the candidate cell list is used to determine a target candidate cell, the target candidate cell is a cell to be subjected to conditional handover by a second network element, and the first network element and the second network element are network elements in a mobile communication network.
In a fourth aspect, an embodiment of the present application provides an apparatus for determining a candidate cell, where the apparatus includes:
an obtaining unit, configured to obtain a candidate cell list, where the candidate cell list includes information of one or more candidate cells;
and the processing unit is used for determining a target candidate cell according to the candidate cell list, wherein the target candidate cell is a cell to be subjected to conditional handover 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, a memory, and a computer program, where the memory is used to store the computer program, and the computer program includes program instructions, and the processor is configured to invoke the program instructions to execute the candidate cell determination method described in the first aspect and the second aspect.
In a sixth aspect, embodiments of the present application provide a computer-readable storage medium, where one or more instructions are stored, and the one or more instructions are adapted to be loaded by a processor and execute the candidate cell determination method described in the first and second aspects.
In a seventh aspect, an embodiment of the present application provides a chip, where the chip is configured to perform the candidate cell determination method described in the first aspect and the second aspect.
In an eighth aspect, an embodiment of the present application provides a chip module, where the chip module includes a storage device, a chip, and a communication interface, and the chip is configured to execute the candidate cell determination method described in the first aspect and the second aspect.
In this embodiment, the second network element may obtain a candidate cell list, where the candidate cell list includes information of one or more candidate cells; and reporting a candidate cell list to a first network element, wherein the candidate cell list is used for determining a target candidate cell, the target candidate cell is a cell to be subjected to conditional handover by a second network element, and the first network element and the second network element are network elements in a mobile communication network. By the method, the number of candidate cells during condition switching can be reduced, and the signaling overhead of an Xn interface is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of an indoor and outdoor communication network architecture according to an embodiment of the present application;
fig. 2 is a schematic flowchart of a method for determining a candidate cell according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a CGI detection and reporting method according to an embodiment of the present application;
fig. 4 is a flowchart illustrating another candidate cell determining method according to an embodiment of the present application;
fig. 5 is a schematic diagram of a candidate cell determining apparatus according to an embodiment of the present disclosure;
fig. 6 is a simplified schematic physical structure of a communication device according to an embodiment of the present application;
fig. 7 is a simplified schematic diagram of a chip module according to an embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the recitation of a claim "comprising a" 8230a "\8230means" does not exclude the presence of additional identical elements in the process, method, article or apparatus in which the element is incorporated, and further, similarly named components, features, elements in different embodiments of the application may have the same meaning or may have different meanings, the specific meaning of which should be determined by its interpretation in the specific embodiment or by further combination with the context of the specific embodiment.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope herein. The word "if" as used herein may be interpreted as "at" \8230; "or" when 8230; \8230; "or" in response to a determination ", depending on the context. Also, 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 will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, components, items, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any 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 ". An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.
It should be understood that, although the steps in the flowcharts in the embodiments of the present application are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless otherwise indicated herein. Moreover, at least some of the steps in the figures may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, in different orders, and may be performed alternately or at least partially with respect to other steps or sub-steps of other steps.
It should be noted that, step numbers such as 110, 120, etc. are used herein for the purpose of more clearly and briefly describing the corresponding content, and no substantial limitation on the sequence is made, and a person skilled in the art may perform 120 first and then perform 110, etc. in the specific implementation, but these should be within the protection scope of the present application.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for the convenience of description of the present application, and have no specific meaning by themselves. Thus, "module", "component" or "unit" may be used mixedly.
In order to better understand the embodiments of the present application, the following terms refer to the embodiments of the present application:
conditional Handover (CHO) is to let the terminal device select a target base station according to the measurement result and initiate a Handover execution process. The terminal device may initiate a random access procedure to the target cell. Therefore, the situation that the cell switching of the terminal equipment fails due to the change of the wireless link state in the signaling interaction between the terminal equipment and the source base station and the signaling interaction between the source base station and the target base station can be avoided. In this way, CHO improves robustness during user handover.
An Access and Mobility Management Function (AMF) is a main functional unit of a 5G core network (5 GC), and can complete Access and Mobility Management of a terminal device, which is equivalent to a part of a Mobility Management Entity (MME).
The Session Management Function (SMF) is an important functional unit of the 5GC, is responsible for processing the traffic of the user, and can be regarded as a combination of the MME bearer Management part and the control plane functions of the Serving GateWay (SGW) and the PDN GateWay (PGW).
A Public Land Mobile Network (PLMN) is a Network established and operated for the purpose of providing Land Mobile services to the Public. The network is typically interconnected with the Public Switched Telephone Network (PSTN) to form a communications network on a regional or national scale.
In order to better understand the embodiments of the present application, a network architecture to which the embodiments of the present application are applicable is described below.
Referring to fig. 1, fig. 1 is a schematic diagram of an indoor and outdoor communication network architecture according to an embodiment of the present disclosure. As shown in fig. 1, the communication network architecture is formed by an outdoor network architecture and an indoor network architecture, where the outdoor network architecture includes a first network element, other network elements, and a second network element; the indoor network architecture comprises an indoor small base station and a second network element. And, the first network element, the other network elements and the indoor small cell base station may all communicate through a specific interface, for example, an Xn interface, which may all communicate with a Core network (Core Net, CN).
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) in which the second network element is located, and the first network element may be a Cell of an outdoor Macro Station (Macro Base Station) or may be a Cell of an indoor Cell Base Station. The indoor small cell may be an Access Point (AP) or the like. The outdoor macro station or the indoor small cell station may 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 a cell of the indoor small cell base station and a cell of the outdoor macro station. For example, the second network element may move from a cell of an indoor small cell base station to a cell of an outdoor macro station.
In the embodiment of the application, two moving scenes exist, wherein one scene is a scene that the second network element moves from the cell of the outdoor macro station to the cell of the indoor small base station; the second scenario is a scenario in which the second network element moves from the cell of the indoor small cell base station to the cell of the outdoor macro station. The communication network architecture shown in fig. 1 is a scenario in which a first scenario is taken as an example, that is, a scenario in which a second network element is switched from a cell of an outdoor macro station to a cell of an indoor cell-based station, and a corresponding method embodiment is the same as a method embodiment corresponding to a second mobile scenario, which is not described in detail herein.
The present invention is applicable to a 5th generation (5G) communication system, a 4G or 3G communication system, and a future new communication system, for example, a 6G or 7G or in-vehicle short-distance communication system. The technical solution of the present invention is also applicable to different network architectures, including but not limited to a relay network architecture, a dual link architecture, a Vehicle-to-any-object communication (Vehicle-to-Vehicle) architecture, an in-Vehicle short-distance communication architecture, and the like.
In this embodiment of the present application, the Core Network may be an evolved packet Core (EPC for short), a 5G Core Network (5G Core Network), or may be a novel Core Network in a future communication system. The 5G Core Network is composed of a set of devices, and implements Access and Mobility Management functions (AMF) of functions such as Mobility Management, user Plane Functions (UPF) providing functions such as packet routing and forwarding and QoS (Quality of Service) Management, session Management Functions (SMF) providing functions such as Session Management, IP address allocation and Management, and the like. The EPC may be composed of an MME providing functions such as mobility management, gateway selection, etc., a Serving Gateway (S-GW) providing functions such as packet forwarding, etc., and a PDN Gateway (P-GW) providing functions such as terminal address allocation, rate control, etc.
The network device related in the embodiment of the present application is an entity for transmitting or receiving signals on a network side, and may be configured to perform inter-conversion between a received air frame and a network Protocol (IP) packet, where the network device is used as a router between a terminal device and the rest of an access network, where the rest of the access network may include an IP network and the like. The access network device may also coordinate attribute management for the air interface. For example, the access network device may be an eNB in LTE, may also be a New Radio Controller (NR Controller), may be a gNB in a 5G system, may be a Centralized network element (Centralized Unit), may be a New Radio base station, may be a Radio remote module, may be a micro base station, may be a Relay (Relay), may be a Distributed network element (Distributed Unit), may be a Reception Point (TRP) or a Transmission Point (TP), and may be a G node in an in-vehicle short-distance communication system or any other wireless access device, but the embodiment of the present invention is not limited thereto.
A Base Station (BS) in the embodiment of the present application, which may also be referred to as a base station device, is a device deployed in a Radio Access Network (RAN) to provide a wireless communication function. For example, the device providing the base station function in the 2G network includes a Base Transceiver Station (BTS), the device providing the base station function in the 3G network includes a node B (NodeB), the device providing the base station function in the 4G network includes an Evolved node B (eNB), and in a Wireless Local Area Network (WLAN), the device providing the base station function is an Access Point (AP), the device providing the base station function in the 5G New Radio (New Radio, NR) is a gNB (ng-eNB), where the gNB and the terminal communicate with each other by using an NR technology, the ng-eNB and the terminal communicate with each other by using an E-a (Evolved Universal Radio Access) technology, and both the gNB and the ng-eNB may be connected to the 5G core network. The base station in the embodiment of the present application also includes a device and the like that provide a function of the base station in a future new communication system.
The base station controller in the embodiment of the present application is a device for managing a base station, for example, a Base Station Controller (BSC) in a 2G network, a Radio Network Controller (RNC) in a 3G network, or a device for controlling and managing a base station in a future new communication system.
The network on the network side in the embodiment of the present invention refers to a communication network providing a communication service for a terminal, and includes a base station of a radio access network, a base station controller of the radio access network, and a device on the core network side.
In the embodiment of the application, a unidirectional communication link from an access network to a terminal is defined as a downlink, data transmitted on the downlink is downlink data, and the transmission direction of the downlink data is called as a downlink direction; the unidirectional communication link from the terminal to the access network is an uplink, the data transmitted on the uplink is uplink data, and the transmission direction of the uplink data is referred to as an uplink direction.
A terminal in this embodiment may refer to various forms of User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station (mobile station, MS), a remote station, a remote terminal, a mobile device, a user terminal, a terminal device (terminal equipment), a wireless communication device, a user agent, or a user equipment. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with a Wireless communication function, a computing device or other processing device connected to a Wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G Network or a terminal device in a Public Land Mobile Network (PLMN) for future evolution, and the like, which is not limited in the embodiment of the present application.
In order to reduce the number of candidate cells and reduce signaling overhead of an Xn interface, embodiments of the present application provide a method and an apparatus for determining candidate cells, and details of the method and the apparatus for determining candidate cells provided in embodiments of the present application are further described below.
Referring to fig. 2, fig. 2 is a flowchart illustrating a candidate cell determining method according to an embodiment of the present disclosure. The candidate cell determination method includes operations 210 to 220 as follows. The method shown in fig. 2 may be executed by the second network element, or may be a chip in the second network element. When the second network element performs the procedure shown in fig. 2, the following steps may be included:
210. a candidate cell list is obtained, the candidate cell list comprising cell identification information of one or more candidate cells.
In particular, the candidate cell list may be determined by the second network element by one or more of:
optionally, the candidate cell list may be determined according to a historical handover record, where the historical handover record includes historical cell handover information, and the historical cell handover information is cell information of a cell accessed by the second network element after cell handover has been performed. Each cell in the history handover record may be determined by the second network element through a cell handover procedure, or may be determined by a CHO method. The number of cells in the history handover record may be one or more, and the second network element may obtain the candidate cell list by obtaining the cell representation information of each cell.
Optionally, the candidate cell list may be determined according to Core Network assisted Radio Access Network (RAN) parameter tuning, where the Core Network assisted RAN parameter tuning is issued by the Core Network to the second Network element. The core network assisted RAN parameter tuning assists the RAN side to minimize state transitions of the second network element and to optimize 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 (AMF) or a Session Management Function (SMF).
Among other things, the AMF may derive core network assisted RAN parameter tuning based on collected behavior statistics of the second network element, expected behavior of the second network element, and/or other available information of the second network element, such as a subscribed Data Network Name (DNN), user Permanent Identifier (SUPI) scope, and other information. If desired behavioral parameters, network configuration parameters, or SMF-derived core network-assisted RAN parameter tuning of the second network element are maintained in the AMF, the AMF may use this information to select core network-assisted RAN parameter tuning. If the AMF can derive a Mobility Pattern (Mobility Pattern) of the second network element, the AMF may consider Mobility Pattern parameters when determining the core network assisted RAN parameter tuning.
The SMF may use SMF assisted parameters to derive core network assisted RAN parameter tuning, 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 RAN parameter tuning assisted by the core network to the AMF, and the AMF stores the RAN parameter tuning assisted by the core network as a context at a Protocol Data Unit (PDU) session (session) level.
Optionally, one or more of the following information may be determined from core network assisted RAN parameter tuning:
desired Handover (HO) behavior (Expected HO behavior); e.g. the desired interval for handover of the second network element between RANs (inter-RAN).
Expected mobility of the second network element (Expected UE mobility) for predicting whether the second network element is moving or stationary.
An Expected UE moving trajectory of the second network element, which information may be derived from statistical information, expected behavior parameters of the second network element or subscription information.
Optionally, the candidate cell list may be derived by the AMF or the SMF based on the RAN parameter tuning assisted by the core network and sent by the AMF or the SMF to the second network element when the PDU session is established or modified.
Optionally, the candidate cell list may be determined according to an Automatic Neighbor Relation (ANR) function, where the ANR function is used by the first network element to determine the Neighbor Relation. That is, the first network element may acquire the candidate cell list by the ANR function from surrounding network devices. Further, the first network element may send the candidate cell list to the second network element.
The ANR function has both a neighbor detection function and a neighbor deletion function. The neighbor cell detection function is used for finding neighbor cells and adding the neighbor cells to a neighbor cell relation list, and the neighbor cell deletion function is used for deleting an outdated neighbor cell relation; the neighbor deletion function is a base station internal behavior, and the neighbor detection function needs interaction between the base station and the terminal device. In practical application, the ANR function is to add and manage a neighboring Cell relationship by detecting and reporting a Global Cell identity (CGI) of a target Cell.
As shown in fig. 3, which is a schematic diagram of a CGI detection and reporting manner, in fig. 3, for example, a second network element is handed over from an indoor cell base station to an outdoor macro station, and a target cell may be a serving cell of the outdoor macro station. The number of the outdoor macro stations may be one or more than one, and the embodiment of the present application is not limited. In fig. 3, the second network element sends a measurement report related to the target Cell to the indoor Cell base station, where the measurement report includes a Physical Cell Identifier (PCI) of the target Cell, but the measurement report does not include the CGI. After the indoor cell base station receives the measurement report containing the PCI of the target cell sent by the second network element, the indoor cell base station may send indication information to the second network element, where the indication information may indicate the second network element to read CGI information of a cell corresponding to the PCI, that is, to read CGI information of the target cell. The second network element may obtain CGI information corresponding to the target cell through a Broadcast Control Channel (BCCH). When the second network element obtains the CGI of the target cell, the second network element may report the detected CGI of the target cell to the indoor cell base station. And when the indoor small cell determines a newly found neighbor cell according to the CGI information of the target cell, namely the target cell is not in the neighbor cell list, the indoor small cell adds the target cell to the neighbor cell relation list, so that the ANR function is completed.
Optionally, the service modes supported by the candidate cells in the candidate cell list include, but are not limited to, the following two operation modes: mode one and mode two. The cell with the working mode of the first mode allows a second network element which signs the cell to access; the cell with the mode two may allow the subscriber and the second non-subscriber network element, and may provide the subscriber with a higher access level and a faster service rate.
Alternatively, the Cell identification information may be Physical Cell Identity (PCI), cell Global Identity (CGI), or the like.
After obtaining the candidate cell list, the second network element may store the candidate cell list in a first memory, where the first memory may be a memory in the second network element.
220. And reporting a candidate cell list to a first network element, wherein the candidate cell list is used for determining a target candidate cell, the target candidate cell is a cell to be subjected to conditional handover by a second network element, and the first network element and the second network element are network elements in a mobile communication network.
In a possible implementation, reporting the candidate cell list to the first network element may be performed by triggering a measurement event. The second network element may trigger a measurement event and report the candidate cell list to the first network element. Wherein the measurement event may include one or more of the following time periods:
an A2 event, the A2 event indicating that the signal quality of the serving cell is below a first threshold;
an A3 event, the A3 event indicating that a signal quality offset of a neighbor cell is higher than a signal quality of the serving cell;
an A4 event, the A4 event being used to indicate that the signal quality of the neighbor cell is above a second threshold;
an A5 event, the A5 event being used to indicate that the signal quality of the neighbor cell is below a third threshold and above a fourth threshold.
The serving cell refers to a cell that is providing communication service for the second network element, and the neighboring cell is a cell adjacent to the serving cell. The first threshold, the second threshold, the third threshold, and the fourth threshold may be configured by a network device, and the embodiments of the present application are not limited.
In a possible implementation, reporting the candidate cell list to the first network element may be performed by triggering the detected entry marker region. The second network element may trigger the detected entry marking area to report the candidate cell list to a network element, where the marking area is used to mark that the second network element actively sends the candidate cell list to the first network element when entering the marking area in the connection mode.
Optionally, the marking area may be identified by one or more of the following:
a global cell identity (CGI) identifier;
physical layer cell identity PCI;
latitude and longitude coordinate information.
Wherein the locally stored candidate cell list in the second network element is associated with the marked area, and may be in a one-to-one correspondence.
Optionally, the second network element reports the candidate cell list to the first network element, which may be reported by a measurement report or user assistance information (UEAssistanceInformation).
Optionally, reporting via the measurement report may be implemented by adding an Information Element (IE) in the measurement report, for example, by adding an Information element of the candidate cell list, optionally, 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 operating mode of each candidate cell in the candidate cell list;
each candidate cell in the candidate cell list is respectively belonged to a public land mobile network identification PLMN ID;
the Tracking Area of each candidate cell in the candidate cell list encodes TAC, where TA is a Tracking Area (TA), which is an Area used for paging and location update.
By the embodiment of the application, the second network element may obtain a candidate cell list, where the candidate cell list may include cell identification information, a working mode, a PLMN ID, a TAC, and other information corresponding to each candidate cell in the candidate cell list. According to the scheme, aiming at the indoor-to-outdoor or outdoor-to-indoor cell switching scene, under the scene, the cells switched by the second network element are usually fewer and are fixed. For example, the second network element may be handed over from an indoor small cell base station to an outdoor specific macro station, or from an outdoor macro station to a specific indoor small cell base station. Cells covered to the indoor vicinity are not required to be used as cells in the candidate cell list, and the candidate cells are determined by the network side according to specific parameters. By the method, the number of candidate cells during conditional switching is reduced, and the signaling overhead of an Xn interface is reduced.
Referring to fig. 4, fig. 4 is a flowchart illustrating another candidate cell determining method according to an embodiment of the present disclosure. The candidate cell determination method includes operations 410 to 420 as follows. The method shown in fig. 4 may be executed by the first network element, or may be a chip corresponding to the first network element. When the first network element performs the procedure shown in fig. 4, the following steps may be included:
410. a candidate cell list is obtained, the candidate cell list comprising information of one or more candidate cells.
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 operating mode of each candidate cell in the candidate cell list;
identifying PLMN IDs of public land mobile networks 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 the detected entry mark area.
Optionally, the second network element reports the candidate cell list to the first network element, which may be reported by a measurement report or user assistance information (UEAssistanceInformation).
Optionally, the first network element may store the candidate cell list in a second memory, and the first memory may be a memory within the first network element. It should be noted that each candidate cell in the candidate cell list and the second network element may store the candidate cell list.
420. And determining a target candidate cell according to the candidate cell list, wherein the target candidate cell is a cell to be subjected to conditional handover by the first network element, 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 the embodiment of the present application.
Optionally, if the first network element is connected to the second network element through the cell whose operation mode is mode one, the candidate cell to be conditionally switched 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 the cell with the working mode of mode two, the candidate cells to be subjected to conditional handover in all the second network elements connected to the first network element are configured as the cells in the candidate cell list.
By the embodiment of the application, the first network element may obtain a candidate cell list, where the candidate cell list may include cell identification information, a working mode, a PLMN ID, a TAC, and other information corresponding to each candidate cell in the candidate cell list. And the first network element may determine the target candidate cell according to the candidate cell list. The number of the candidate cells in the candidate cell list is small and fixed, so that the number of the candidate cells in the candidate cell list is reduced during condition switching, and the signaling overhead of an Xn interface is reduced.
Referring to fig. 5, fig. 5 is a schematic diagram of a candidate cell determination apparatus according to an embodiment of the present disclosure. The candidate cell determination apparatus shown in fig. 5 may be used to perform some or all of the functions in the method embodiments described in fig. 2 and 4 above. The apparatus may be a second network element, an apparatus in the second network element, or an apparatus capable of being used in cooperation with the second network element. The apparatus may also be a device corresponding to the first network element, or an apparatus in a device corresponding to the first network element, or an apparatus that can be used in match with a device corresponding to the first network element. The first network element may be a serving cell in a network device, and the second network element may be a terminal device.
The logical structure of the apparatus may include: an obtaining unit 510, a transceiving unit 520, and a processing unit 530, wherein when the apparatus is applied to a second network element:
an obtaining unit 510, configured to obtain a candidate cell list, where the candidate cell list includes cell identification information of one or more candidate cells;
a transceiver unit 520, configured to report a candidate cell list to a first network element, where the candidate cell list is used to determine a target candidate cell, the target candidate cell is a cell to be conditionally switched by a second network element, and the first network element and the second network element are network elements in a mobile communication network.
In one possible implementation, 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 operating mode of each candidate cell in the candidate cell list;
identifying PLMN IDs of public land mobile networks 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 possible implementation, the candidate cell list is determined according to one or more of the following:
the historical switching record comprises historical cell switching information which is determined according to the historical switching record and is the cell information of the cell accessed by the second network element after cell switching is carried out; or,
the radio access network RAN parameter adjustment and optimization assisted by the core network is sent to a second network element by the core network according to the radio access network RAN parameter adjustment and optimization assisted by the core network; or,
the automatic neighbor relation is determined according to the automatic neighbor relation, and the automatic neighbor relation is used for the first network element to determine the neighbor relation.
In a possible implementation manner, the measurement event is triggered, and the transceiver unit 520 is further configured to report a candidate cell list to the first network element;
in one possible implementation, the measurement event includes one or more of the following events:
an A2 event, the A2 event being indicative of the signal quality of the serving cell being below a first threshold;
an A3 event, the A3 event being used to indicate that the signal quality offset of the neighbor cell is higher than the signal quality of the serving cell;
an A4 event, wherein the A4 event is used for indicating that the signal quality of the adjacent cell is higher than a second threshold value;
and an A5 event, wherein the A5 event is used for indicating that the signal quality of the neighbor 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 candidate cell list to the first network element through a measurement report or user assistance information ueassistance information.
In a possible implementation manner, the detected entering of the marked area is triggered, and the transceiver unit 520 is further configured to report a candidate cell list to the first network element, where the marked area is used to mark that the second network element actively sends the candidate cell list to the first network element when entering the marked area in the connection mode.
In one possible implementation, the marking area is identified by one or more of:
a global cell identity Code (CGI) identifier;
physical layer cell identity PCI;
latitude and longitude coordinate information.
When the device is applied to the equipment corresponding to the first network element:
an obtaining unit 510, configured to obtain a candidate cell list, where the candidate cell list includes information of one or more candidate cells;
a processing unit 530, configured to determine a target candidate cell according to the candidate cell list, where the target candidate cell is a cell to be conditionally 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.
Referring to fig. 6, fig. 6 is a simplified schematic diagram of an entity structure of a communication device according to an embodiment of the present disclosure, where the communication device includes a processor 610, a memory 620, and a communication interface 630, and the processor 610, the memory 620, and the communication interface 630 are connected through one or more communication buses. The communication device may be a chip, a chip module, or the like.
The processor 610 is configured to support the communication device to perform the functions corresponding to the methods of fig. 2 and 3 described above. It should be understood that, in the embodiment of the present application, the processor 610 may be a Central Processing Unit (CPU), and the processor may also be other general-purpose processors, digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs), discrete hardware components, or other programmable logic devices, discrete gate or transistor logic devices. 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 present embodiments may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example and not limitation, many forms of Random Access Memory (RAM) are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlronous DRAM (SLDRAM), and direct bus RAM (DR RAM).
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 control communication interface 630 reports a candidate cell list to the first network element, where the candidate cell list is used to determine a target candidate cell, the target candidate cell is a cell to be subjected to conditional handover by the second network element, and the first network element and the second network element are network elements in the mobile communication network.
In one possible implementation, 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 operating mode of each candidate cell in the candidate cell list;
each candidate cell in the candidate cell list is respectively belonged to a public land mobile network identification PLMN ID;
the tracking area code TAC of each candidate cell in the candidate cell list.
In one possible implementation, the candidate cell list is determined according to one or more of the following:
the historical switching record comprises historical cell switching information which is determined according to the historical switching record and is the cell information of the cell accessed by the second network element after cell switching is carried out; or,
the radio access network RAN parameter adjustment and optimization assisted by the core network is sent to a second network element by the core network according to the radio access network RAN parameter adjustment and optimization assisted by the core network; or,
and determining the automatic neighbor relation according to the automatic neighbor relation, wherein the automatic neighbor relation is used for determining the neighbor relation by the first network element.
In a possible implementation, a measurement event is triggered, and the communication interface 630 is controlled to report the candidate cell list to the first network element;
in one possible implementation, the measurement event includes one or more of the following events:
an A2 event, the A2 event being indicative of the signal quality of the serving cell being below a first threshold;
an A3 event, wherein the A3 event is used for indicating that the signal quality offset of the adjacent cell is higher than that of the serving cell;
an A4 event, wherein the A4 event is used for indicating that the signal quality of the adjacent cell is higher than a second threshold value;
and an 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.
In one possible implementation, the control communication interface 630 reports the candidate cell list to the first network element via a measurement report or user assistance information ueassistance information.
In a possible implementation manner, the detected entering of the marked area is triggered, and the communication interface 630 is controlled to report the candidate cell list to the first network element, where the marked area is used to mark that the second network element actively sends the candidate cell list to the first network element when entering the marked area in the connection mode.
In one possible implementation, the marking area is identified by one or more of:
a global cell identity Code (CGI) identifier;
physical layer cell identity PCI;
latitude and longitude coordinate information.
When the communication device is a device corresponding to the first network element:
the processor 610 invokes program codes stored in the memory 620 to determine a target candidate cell according to the candidate cell list, the target candidate cell being a cell for which a first network element is to be conditionally handed over, the first network element and the second network element being network elements in a mobile communication network.
The embodiment of the application also provides a chip, and the chip can also be contained in the chip module.
When the chip is applied to the second network element:
the chip is used for acquiring a candidate cell list, wherein the candidate cell list comprises cell identification information of one or more candidate cells;
the chip is also used for triggering reporting of a candidate cell list to the first network element, the candidate cell list is used for determining a target candidate cell, the target candidate cell is a cell to be subjected to conditional handover by the second network element, and the first network element and the second network element are network elements in the mobile communication network.
In one possible implementation, 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 operating mode of each candidate cell in the candidate cell list;
each candidate cell in the candidate cell list is respectively belonged to a public land mobile network identification PLMN ID;
the tracking area code TAC of each candidate cell in the candidate cell list.
In one possible implementation, the candidate cell list is determined according to one or more of the following:
the historical switching record comprises historical cell switching information which is determined according to the historical switching record and is the cell information of the cell accessed by the second network element after cell switching is carried out; or,
the RAN parameter optimization assisted by the core network is sent to a second network element by the core network according to the RAN parameter optimization assisted by the core network; or,
the automatic neighbor relation is determined according to the automatic neighbor relation, and the automatic neighbor relation is used for the first network element to determine the neighbor relation.
In a possible implementation manner, a measurement event is triggered, and the chip is further configured to trigger reporting of a candidate cell list to the first network element;
in one possible implementation, the measurement event includes one or more of the following events:
an A2 event, the A2 event being used to indicate that the signal quality of the serving cell is below a first threshold;
an A3 event, the A3 event being used to indicate that the signal quality offset of the neighbor cell is higher than the signal quality of the serving cell;
an A4 event, wherein the A4 event is used for indicating that the signal quality of the adjacent cell is higher than a second threshold value;
and an 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.
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 ueassistance information.
In a possible implementation manner, the detected entering of the marked region is triggered, the chip is further configured to trigger reporting of the candidate cell list to the first network element, and the marked region is configured to mark that the second network element actively sends the candidate cell list to the first network element when entering the marked region in the connection mode.
In one possible implementation, the marker region is identified by one or more of:
a global cell identity (CGI) identifier;
physical layer cell identity PCI;
latitude and longitude coordinate information.
When the device is applied to the equipment corresponding to the first network element:
the chip is also used for acquiring a candidate cell list, wherein the candidate cell list comprises information of one or more candidate cells;
the chip is also used for determining a target candidate cell according to the candidate cell list, wherein the target candidate cell is a cell to be subjected to conditional handover by the first network element, and the first network element and the second network element are network elements in the mobile communication network.
Referring to fig. 7, fig. 7 is a simplified schematic diagram of a chip module according to an embodiment of the present disclosure, where the chip module includes a storage device 710, a chip 720, and a communication interface 730, and when the chip module is applied to a second network element, where:
the chip 720 is configured to obtain a candidate cell list, where the candidate cell list includes cell identification information of one or more candidate cells;
the chip 720 is further configured to trigger the communication interface 730 to report a candidate cell list to the first network element, where the candidate cell list is used to determine a target candidate cell, the target candidate cell is a cell to be subjected to conditional handover by the second network element, and the first network element and the second network element are network elements in a mobile communication network.
In one possible implementation, 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 operating mode of each candidate cell in the candidate cell list;
each candidate cell in the candidate cell list is respectively belonged to a public land mobile network identification PLMN ID;
the tracking area code TAC of each candidate cell in the candidate cell list.
In one possible implementation, the candidate cell list is determined according to one or more of the following:
the historical switching record comprises historical cell switching information which is determined according to the historical switching record and is the cell information of the cell accessed by the second network element after cell switching is carried out; or,
the radio access network RAN parameter adjustment and optimization assisted by the core network is sent to a second network element by the core network according to the radio access network RAN parameter adjustment and optimization assisted by the core network; or,
and determining the automatic neighbor relation according to the automatic neighbor relation, wherein the automatic neighbor relation is used for determining the neighbor relation by the first network element.
In a possible implementation manner, the chip 720 is further configured to trigger the communication interface 730 to report the candidate cell list to the first network element;
in one possible implementation, the measurement event includes one or more of the following events:
an A2 event, the A2 event being indicative of the signal quality of the serving cell being below a first threshold;
an A3 event, the A3 event being used to indicate that the signal quality offset of the neighbor cell is higher than the signal quality of the serving cell;
an A4 event, wherein the A4 event is used for indicating that the signal quality of the adjacent cell is higher than a second threshold value;
and an A5 event, wherein the A5 event is used for indicating that the signal quality of the neighbor cell is lower than the third threshold and higher than the fourth threshold.
In a possible implementation, the chip 720 is further 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 ueassistance information.
In a possible implementation manner, the detected entry into the marked area is triggered, the chip 720 is further configured to trigger the communication interface 730 to report the candidate cell list to the first network element, and the marked area is configured to mark that the second network element actively sends the candidate cell list to the first network element when entering the marked area in the connection mode.
In one possible implementation, the marking area is identified by one or more of:
a global cell identity Code (CGI) identifier;
physical layer cell identity PCI;
latitude and longitude coordinate information.
When the device is applied to the equipment corresponding to the first network element:
the chip 720 is further configured to obtain a candidate cell list, where the candidate cell list includes information of one or more candidate cells;
the chip 720 is further configured to determine a target candidate cell according to the candidate cell list, where the target candidate cell is a cell to be conditionally handed over by the first network element, and the first network element and the second network element are network elements in a mobile communication network.
It should be noted that, in the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to relevant descriptions of other embodiments for parts that are not described in detail in a certain embodiment.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs.
The units in the processing equipment of the embodiment of the invention can be merged, divided and deleted according to actual needs.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions according to the embodiments of the present application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, digital subscriber line) or wirelessly (e.g., infrared, wireless, microwave, etc.). Computer-readable storage media can be any available media that can be accessed by a computer or a data storage device, such as a server, data center, etc., that includes one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, memory Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), among others.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (13)
1. A method for determining a candidate cell, comprising:
acquiring a candidate cell list, wherein the candidate cell list comprises information of one or more candidate cells;
and reporting the candidate cell list to a first network element, wherein the candidate cell list is used for determining a target candidate cell, the target candidate cell is a cell to be subjected to conditional handover by a second network element, and the first network element and the second network element are network elements in a mobile communication network.
2. The method of claim 1, wherein the candidate cell list comprises one or more of the following information:
cell identification information corresponding to each candidate cell in the candidate cell list;
a mode of operation of each candidate cell in the candidate cell list;
identifying PLMN IDs of public land mobile networks to which each candidate cell in the candidate cell list belongs;
tracking area coded TACs for each candidate cell in the candidate cell list.
3. The method of claim 1,
the list of candidate cells is determined according to one or more of the following:
the historical switching record comprises historical cell switching information which is determined according to a historical switching record, wherein the historical cell switching information is cell information of a cell accessed by the second network element after cell switching is carried out; or,
the radio access network RAN parameter tuning assisted by the core network is sent to the second network element by the core network; or,
and determining according to the automatic neighbor relation, wherein the automatic neighbor relation is used for determining the neighbor relation by the first network element.
4. The method of claim 1, wherein reporting the candidate cell list to the first network element comprises:
triggering a measurement event, and reporting the candidate cell list to the first network element;
the measurement events include one or more of the following events:
an A2 event, the A2 event indicating that a signal quality of a serving cell is below a first threshold;
an A3 event, the A3 event indicating that a signal quality offset of a neighbor cell is higher than a signal quality of the serving cell;
an A4 event, wherein the A4 event is used for indicating that the signal quality of the neighbor cell is higher than a second threshold value;
an A5 event, the A5 event being used to indicate that the signal quality of the neighbor cell is below a third threshold and above a fourth threshold.
5. The method of claim 1 or 4, wherein reporting the candidate cell list to the first network element comprises:
and reporting the candidate cell list to the first network element through a measurement report or user assistance information (UEAssistant information).
6. The method of claim 1, wherein reporting the candidate cell list to the first network element comprises:
and triggering the detected entering mark area, and reporting the candidate cell list to the first network element, wherein the mark area is used for marking that the second network element actively sends the candidate cell list to the first network element when entering the mark area in the connection mode.
7. The method of claim 6, wherein:
the marking area is identified by one or more of the following means:
a global cell identity Code (CGI) identifier;
physical layer cell identity PCI;
latitude and longitude coordinate information.
8. A method for determining a candidate cell, comprising:
acquiring a candidate cell list, wherein the candidate cell list comprises information of one or more candidate cells;
and determining a target candidate cell according to the candidate cell list, wherein the target candidate cell is a cell to be subjected to conditional handover by a first network element, and the first network element and the second network element are network elements in a mobile communication network.
9. An apparatus for determining a candidate cell, comprising:
an obtaining unit, configured to obtain a candidate cell list, where the candidate cell list includes information of one or more candidate cells;
a transceiver unit, configured to report the candidate cell list to a first network element, where the candidate cell list is used to determine a target candidate cell, the target candidate cell is a cell to be subjected to conditional handover by a second network element, and the first network element and the second network element are network elements in a mobile communication network.
10. A communication device comprising a processor, a memory for storing a computer program comprising program instructions, the processor being configured to invoke the program instructions, to perform the candidate cell determination method of any of claims 1 to 8, or to perform the candidate cell determination method of claim 9.
11. A computer-readable storage medium having stored thereon one or more instructions adapted to be loaded by a processor and to perform the candidate cell determination method of any one of claims 1 to 8 or the candidate cell determination method of claim 9.
12. A chip configured to perform the method of candidate cell determination according to any one of claims 1 to 8.
13. A chip module, characterized in that the chip module comprises a storage device, a chip, and a communication interface, wherein the chip is configured to perform the candidate cell determination method according to any one of claims 1 to 8, or the candidate cell determination method according to claim 9.
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| Title |
|---|
| ""R2-1903435_Discussion on the number of prepared cells for CHO"", 3GPP TSG_RAN\\WG2_RL2, 29 March 2019 (2019-03-29) * |
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| Publication number | Publication date |
|---|---|
| WO2022233326A1 (en) | 2022-11-10 |
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