WO2022133677A1 - Procédé et appareil de sélection de cellule, et terminal et support de stockage - Google Patents

Procédé et appareil de sélection de cellule, et terminal et support de stockage Download PDF

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Publication number
WO2022133677A1
WO2022133677A1 PCT/CN2020/138095 CN2020138095W WO2022133677A1 WO 2022133677 A1 WO2022133677 A1 WO 2022133677A1 CN 2020138095 W CN2020138095 W CN 2020138095W WO 2022133677 A1 WO2022133677 A1 WO 2022133677A1
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WIPO (PCT)
Prior art keywords
cell
frequency point
timer
target slice
slice
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PCT/CN2020/138095
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English (en)
Chinese (zh)
Inventor
付喆
王淑坤
Original Assignee
Oppo广东移动通信有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to PCT/CN2020/138095 priority Critical patent/WO2022133677A1/fr
Priority to CN202080105094.2A priority patent/CN116648951A/zh
Publication of WO2022133677A1 publication Critical patent/WO2022133677A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements

Definitions

  • the embodiments of the present application relate to the field of communications technologies, and in particular, to a cell selection method, apparatus, terminal, and storage medium.
  • the terminal equipment will switch between different cells.
  • a terminal device When a terminal device performs cell handover, it first needs to select a target cell to be handed over.
  • the terminal equipment only selects the target cell to switch to according to the channel quality of each cell, and the amount of information considered in cell selection is relatively single, which causes the terminal equipment to access an inappropriate cell.
  • a terminal device accesses an inappropriate cell, it needs to perform cell selection and handover again, resulting in signaling overhead and service service delay.
  • the embodiments of the present application provide a cell selection method, apparatus, terminal, and storage medium.
  • the technical solution is as follows:
  • a cell selection method is provided, which is applied to a terminal device, and the method includes:
  • a connection process for the first cell or the cell corresponding to the first frequency point is performed.
  • an apparatus for cell selection includes:
  • a cell connection module configured to perform a connection process for the first cell or a cell corresponding to the first frequency after determining the first cell or the first frequency that supports the target slice.
  • a terminal device includes a processor; wherein:
  • the processor is configured to perform a connection process for the first cell or a cell corresponding to the first frequency after determining the first cell or the first frequency that supports the target slice.
  • a computer-readable storage medium where a computer program is stored in the storage medium, and the computer program is configured to be executed by a processor of a terminal device to implement the above cell selection method.
  • a chip is provided, the chip includes a programmable logic circuit and/or program instructions, and when the chip runs on a terminal device, it is used to implement the above cell selection method.
  • a computer program product which when the computer program product runs on a processor of a terminal device, enables the terminal device to execute the above cell selection method.
  • the terminal device By determining the first cell or the first frequency that supports the target slice, the terminal device is connected to the first cell or the cell corresponding to the first frequency, so that the terminal device will decide whether to support the target slice during the cell handover process.
  • handover should be in place as much as possible at one time. Compared with the need to perform cell selection and handover again after a terminal device accesses an inappropriate cell, the embodiments of the present application help to save signaling overhead and shorten the Business service delay.
  • FIG. 1 is a schematic diagram of a network architecture provided by an embodiment of the present application.
  • FIG. 2 is a flowchart of a cell selection method provided by an embodiment of the present application.
  • FIG. 3 is a flowchart of a cell selection method provided by another embodiment of the present application.
  • FIG. 4 is a flowchart of a cell selection method provided by another embodiment of the present application.
  • FIG. 5 is a flowchart of a cell selection method provided by another embodiment of the present application.
  • FIG. 6 is a flowchart of a cell selection method provided by another embodiment of the present application.
  • FIG. 7 is a block diagram of a cell selection apparatus provided by an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a terminal device provided by an embodiment of the present application.
  • the network architecture and service scenarios described in the embodiments of the present application are for the purpose of illustrating the technical solutions of the embodiments of the present application more clearly, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application.
  • the evolution of new business scenarios and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.
  • FIG. 1 shows a schematic diagram of a network architecture provided by an embodiment of the present application.
  • the network architecture may include: a terminal device 10 , a network device 20 and a core network device 30 .
  • the terminal device 10 may refer to a UE (User Equipment, user equipment), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a wireless communication device, a user agent or a user equipment.
  • UE User Equipment
  • an access terminal a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a wireless communication device, a user agent or a user equipment.
  • the terminal device 10 may also be a cellular phone, a cordless phone, a SIP (Session Initiation Protocol, session initiation protocol) phone, a WLL (Wireless Local Loop, wireless local loop) station, a PDA (Personal Digital Assistant, personal digital processing ), handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in 5GS (5th Generation System, fifth-generation mobile communication system) or future evolved Terminal equipment in a PLMN (Pub1ic Land Mobi1e Network, public land mobile communication network), etc., are not limited in this embodiment of the present application.
  • the devices mentioned above are collectively referred to as terminal devices.
  • the number of terminal devices 10 is usually multiple, and one or more terminal devices 10 may be distributed in a cell managed by each network device 20 .
  • the network device 20 is a device deployed in an access network to provide a wireless communication function for the terminal device 10 .
  • the network device 20 may include various forms of macro base stations, micro base stations, relay stations, access points, and the like.
  • the names of devices with network device functions may be different, for example, in 5G NR systems, they are called gNodeBs or gNBs.
  • the name "network equipment” may change.
  • the above-mentioned apparatuses for providing a wireless communication function for the terminal device 10 are collectively referred to as network devices.
  • a communication relationship may be established between the terminal device 10 and the core network device 30.
  • the network device 20 may be EUTRAN (Evolved Universal Terrestrial Radio Access Network, Evolved Universal Terrestrial Radio Access Network) or one or more eNodeBs in EUTRAN; in 5G In the NR system, the network device 20 may be a RAN (Radio Access Network, radio access network) or one or more gNBs in the RAN. In the embodiments of the present application, the network device refers to the network device 20 unless otherwise specified.
  • the functions of the core network device 30 are mainly to provide user connection, manage users, and carry out services, and serve as an interface for the bearer network to provide an external network.
  • the core network equipment in the 5G NR system may include AMF (Access and Mobility Management Function) entity, UPF (User Plane Function, user plane function) entity and SMF (Session Management Function, session management function) entity function) entity and other equipment.
  • AMF Access and Mobility Management Function
  • UPF User Plane Function, user plane function
  • SMF Session Management Function, session management function
  • the network device 20 and the core network device 30 communicate with each other through some air interface technology, such as the NG interface in the 5G NR system.
  • the network device 20 and the terminal 10 communicate with each other through a certain air interface technology, such as a Uu interface.
  • the "5G NR system" in the embodiments of this application may also be referred to as a 5G system or an NR system, but those skilled in the art can understand its meaning.
  • the technical solutions described in the embodiments of this application may be applicable to the 5G NR system, and may also be applicable to the subsequent evolution system of the 5G NR system.
  • the communication system usually supports the handover procedure of the terminal equipment.
  • a user who needs to use network services moves from one cell to another, or due to wireless transmission traffic load adjustment, activation operation and maintenance, equipment failure, etc., in order to ensure the continuity of communication and the quality of service, the system will The communication link with the original cell is transferred to the new cell, that is, the cell handover process is performed.
  • the terminal device can be handed over from the cell of the first network device to the cell of the second network device.
  • Network slicing (slicing for short) is an on-demand networking method that allows operators to separate multiple virtual end-to-end networks on a unified infrastructure. Each network slice extends from the radio access network to the core network. Logical isolation to suit various types of applications. Network slicing is a logical concept, which is a reorganization of resources, such as selecting virtual machines and physical resources required for a specific communication service type according to SLA (Service Level Agreement).
  • SLA Service Level Agreement
  • the terminal device when the AS (Access Stratum, access layer) of the terminal device receives the slice information of the NAS (Non-Access Stratum, non-access layer), that is, S-NSSAI (Single Network Slice Selection Assistance Information, network slice information), the terminal device notifies the gNB of the S-NSSAI information through the MSG5 message (air interface RRC (Radio Resource Control, Radio Resource Control)) message for the gNB to select the appropriate AMF (Access and Mobility Management Function, access and Mobility Management Entity) provides the slicing service.
  • MSG5 message air interface RRC (Radio Resource Control, Radio Resource Control)
  • AMF Access and Mobility Management Function, access and Mobility Management Entity
  • the premise of triggering re-establishment is that the terminal device is safely activated, and at least an SRB (Signalling Radio Bearer, signaling radio bearer) 2 and at least one DRB (Data Radio Bearer, data radio bearer) are established.
  • SRB Signaling Radio Bearer
  • DRB Data Radio Bearer, data radio bearer
  • RRC reconstruction such as handover failure, RLF (Radio Link Failure, radio link failure), and reconfiguration failure.
  • the terminal device starts a T311 timer (a timer for performing a cell selection process), and performs cell selection according to the existing process.
  • the RRC release (Radio Resource Control release, radio resource control signal) can carry redirection information, including a redirected RAT (Radio Access Technology, radio access technology) and frequency point information.
  • a redirected RAT Radio Access Technology, radio access technology
  • the terminal device performs a cell selection process. If the terminal device stores the cell selection information, the terminal device searches for a suitable cell on the stored frequency point. If the cell is found, the terminal equipment selects this cell to camp on. If there is no suitable cell, the terminal equipment performs cell reselection, that is, the terminal equipment scans all supported NR frequency bands, and for each frequency point the terminal equipment only searches for the strongest cell on that frequency point.
  • the terminal equipment selects this cell to camp on, otherwise, the terminal equipment enters an idle state. In the idle state, the terminal equipment performs a cell selection process to find a suitable cell. If the terminal equipment does not find a suitable cell after searching on all the frequencies of all the supported RATs, the terminal equipment tries to find an acceptable cell (acceptable cell) on any RAT to camp on. If the terminal device finds an acceptable cell, the terminal device enters the connected state, otherwise the terminal device stays in the idle state.
  • the terminal equipment during reconstruction, the terminal equipment only considers the channel quality during the cell selection process, and does not consider the slices supported by the terminal equipment and the cell. This may cause the terminal equipment to perform cell selection and handover again after accessing a cell that does not support the desired slice, resulting in signaling overhead, service service delay and other problems.
  • the technical solutions provided by the embodiments of the present application mainly combine the slices supported by the cell in the process of cell handover by the terminal equipment, so as to determine the cell to which the terminal equipment is to be handed over, thereby avoiding the problem of reconnection caused by the inconsistency of the slices, saving energy
  • the signaling overhead is reduced, and the delay of business services is reduced.
  • FIG. 2 shows a flowchart of a cell selection method provided by an embodiment of the present application, and the method can be applied to the terminal device shown in FIG. 1 .
  • the method may include the following steps 210:
  • Step 210 After determining the first cell or the first frequency that supports the target slice, perform a connection process for the first cell or the cell corresponding to the first frequency.
  • the first cell or a cell corresponding to the first frequency point is a suitable or acceptable cell.
  • the terminal device preferentially connects to a cell corresponding to a frequency point that supports the target slice in at least one frequency point.
  • the terminal device preferentially connects with a cell that supports the target slice in at least one candidate cell.
  • the candidate cells are cells located in the vicinity of the terminal device, such as cells whose distance from the terminal device is less than a distance threshold.
  • the specific value of the distance threshold is set by the relevant technical personnel according to the actual situation, which is not specifically limited in this embodiment of the present application.
  • the candidate cell is a cell with pre-stored cell identification information in the terminal device, such as a cell configured before the terminal device leaves the factory, a cell sent by the network device to the terminal device, a user-defined storage cell, and so on.
  • each cell corresponds to only one frequency point, and one frequency point may correspond to one or more cells.
  • the network device informs the terminal device of the slices supported by each cell/frequency (for example, notifying the terminal device of the slices supported by each frequency) identification information, type information of the slices supported by each frequency point, inform the terminal equipment of the identification information of the slices supported by each cell, inform the terminal equipment of the types of slices supported by each cell, etc.). For example, when the terminal device is in a connected state, the network device sends cell/frequency point information to the terminal device, where the cell/frequency point information is used to indicate slices supported by each cell/frequency point.
  • the terminal device pre-stores the slices supported by each cell/frequency point.
  • the terminal device is configured with slices supported by each cell/frequency point before leaving the factory; for another example, the terminal device receives a storage operation from the user, and stores the slices supported by each cell/frequency point.
  • multiple cells/frequency points supporting the target slice are determined, and among the multiple cells/frequency points supporting the target slice, the cell/frequency point with the best channel quality of the corresponding cell may be selected as the first cell/frequency point.
  • a cell/first frequency point and then perform the connection process for the first cell or the cell corresponding to the first frequency point.
  • multiple cells/frequency points supporting the target slice are determined, and among the multiple cells/frequency points supporting the target slice, the cell/frequency point with the shortest distance between the corresponding cell and the terminal device may be selected.
  • the frequency point is used as the first cell/first frequency point, and then the connection process for the first cell or the cell corresponding to the first frequency point is performed.
  • a plurality of cells/frequency points supporting the target slice are determined, and according to the priority corresponding to each cell/frequency point, the cell/frequency point with the highest priority is selected as the first cell/frequency point.
  • the priority is preset in the terminal device, for example, the terminal device configures the priority corresponding to each cell/frequency point before leaving the factory; another example, receiving the setting operation from the user, the priority corresponding to each cell/frequency point is configured. Make settings.
  • the priority corresponding to each cell/frequency point is configured by the network device. For example, when the terminal device is in the connected state, or during RRC release, or in other processes, the terminal device receives the corresponding cell/frequency point from the network device. priority.
  • the terminal device preferentially selects the first cell or the first frequency point that supports the target slice for access when it is determined that at least one of the following conditions is satisfied, or, when After determining the first cell or the first frequency point that supports the target slice, perform the connection process for the first cell or the cell corresponding to the first frequency point: the terminal device is a device that supports slicing, the terminal device is a device of a specific version, and the terminal device is a device of a specific version.
  • the first cell or the first frequency point that supports the target slice is used to access, or used to instruct the terminal device to perform the first cell or the first frequency point corresponding to the first cell after determining the first cell or the first frequency point that supports the target slice.
  • the cell does not include slice information, it means that the cell does not support slices, and the cell does not support the target slice.
  • the cell includes slice information, and based on the slice information, the slice supported by the cell can be determined, and then it is determined whether the cell supports the target slice. If the slice supported by the cell does not include the target slice, the cell is not the first slice. A cell; if the cell supports the target slice, the cell is the first cell.
  • the slice supported by a cell is determined by the frequency point corresponding to the cell. If the frequency point corresponding to the cell does not have corresponding slice information, the frequency point is not the first frequency point, and the cell does not support slicing; If the slice supported by the frequency point corresponding to the cell does not include the target slice, the frequency point is not the first frequency point; if the frequency point corresponding to the cell supports the target slice, the frequency point is the first frequency point.
  • a cell is selected from the multiple cells corresponding to the first frequency point and a connection process for the cell is performed.
  • a cell that is closest to the terminal device or has the best channel quality is selected to perform the connection process.
  • a cell with the highest priority is selected from the plurality of cells corresponding to the first frequency point to perform the connection process.
  • the priority is preset in the terminal device, for example, the terminal device is set with the priority of each cell corresponding to the first frequency point before leaving the factory; in another example, receiving the setting operation from the user, the first frequency point corresponds to The priority of each cell is set.
  • the priority of each cell corresponding to the first frequency point is configured by the network device. For example, when the terminal device is in the connected state, or during RRC release, or other processes, the terminal device receives the first The priority of each cell corresponding to the frequency point.
  • the target slice is any of the following slices: a slice corresponding to a currently activated session, a currently activated slice, a slice corresponding to a currently activated session with the highest priority, a currently activated slice with the highest priority, Intended slices, slices corresponding to sessions to be established, slices to be established, slices with specific identifiers, specific slices corresponding to at least one of activated sessions, specific slices corresponding to at least one of sessions to be established slice.
  • the target slice is indicated to the AS by the NAS, or the target slice is selected by the AS.
  • the AS selects the target slice without signaling interaction between the NAS and the AS, which saves signaling overhead; however, since the AS may not know all the information of the service, for example, the AS cannot know the processing priority of each service ( If the service with the highest priority cannot be known), the target slice selected by the AS is not necessarily the one that best meets the service requirements or processing efficiency (for example, the slice with the highest service priority cannot be selected as the target slice), and the accuracy rate is low.
  • NAS can learn the information corresponding to each slice.
  • NAS can learn the processing priority of each service (for example, it can learn the service with the highest priority), so the target slice that NAS selects and indicates to AS is more suitable Service requirements, service processing efficiency, and accuracy are high; however, if the NAS indicates the target slice to the AS, signaling interaction is required, which increases signaling overhead.
  • the AS selects the target slice, which has lower accuracy but can save signaling overhead; the NAS indicates the target slice to the AS, which has higher accuracy but increases signaling overhead.
  • the information of the first cell or the first frequency point is stored and valid by the terminal device, such as the information of the first cell or the first frequency point sent by the received and stored network device, pre-configured in the terminal device information of the first cell or the first frequency point in the , and so on.
  • connection process is a connection re-establishment process, such as a process of connecting to the first cell after disconnecting from other cells except the first cell.
  • connection process is the process of initializing the connection, that is, the process of connecting with a certain cell without being connected with any cell, or without being connected with any cell within the most recent preset time period .
  • specific duration of the preset duration is set by the relevant technical personnel according to the actual situation, which is not specifically limited in this embodiment of the present application.
  • the terminal equipment by determining the first cell or the first frequency point that supports the target slice, the terminal equipment is connected to the first cell or the cell corresponding to the first frequency point, so that the terminal equipment is in the In the process of performing cell handover, whether the target slice is supported is the priority condition for cell selection, and the handover is in place as much as possible at one time.
  • the embodiments of the application help to save signaling overhead and shorten service service delay.
  • FIG. 3 shows a flowchart of a cell selection method provided by another embodiment of the present application, and the method can be applied to the terminal device shown in FIG. 1 .
  • the method may include the following steps (310-330):
  • Step 310 Start a first timer, where the first timer is used for the terminal device to perform a cell selection process.
  • the first timer is a T311 timer.
  • Step 320 Search for a first cell or a first frequency point that supports the target slice.
  • the search range is at least one candidate cell.
  • the first cell or a cell corresponding to the first frequency point is a suitable or acceptable cell.
  • Step 330 if the first cell or the first frequency point is searched, a connection process for the first cell or the cell corresponding to the first frequency point is performed.
  • connection process is a connection re-establishment process, such as a process of connecting to the first cell after disconnecting from other cells except the first cell.
  • connection process is the process of initializing the connection, that is, the process of connecting with a certain cell without being connected with any cell, or without being connected with any cell within the most recent preset time period .
  • the specific duration of the preset duration is set by the relevant technical personnel according to the actual situation, which is not specifically limited in this embodiment of the present application.
  • RLF, HO failure, or reconfiguration failure is detected, if the AS is safely activated at this time, and the SRB2 and at least one DRB have been established, the RRC connection re-establishment process is started.
  • Stopping the first timer may mean that the first timer suspends the timing but retains the timing information (eg, the counted duration of the latest timing), or may mean that the first timer stops timing and deletes the timing information.
  • the first state of the wireless connection is switched to the second state if the first timer expires.
  • Expiration of the first timer means that when the first timer expires, the first cell or the first frequency point has not yet been searched.
  • the above-mentioned wireless connection is an RRC connection.
  • the first state is a connected state
  • the second state is an idle state.
  • the connected state refers to a state in which the terminal maintains a wireless connection with a certain cell
  • the idle state refers to a state in which the terminal does not perform wireless connection with any cell (or network device).
  • the first cell or the first frequency point supporting the target slice is searched for within the set duration of the first timer, so as to set up the search process.
  • the upper limit of the duration is set, which avoids the waste of signaling overhead caused by too long search time, and also saves the overall connection duration.
  • the method further includes: if the first timer expires, performing a connection process for the second cell or a cell corresponding to the second frequency, or camping on an unsupported target A slice but a suitable or acceptable cell, or, access a suitable or acceptable cell that does not support the target slice.
  • camping refers to maintaining a non-connected state with the corresponding cell.
  • a suitable cell is a cell for normal communication (eg, a cell that satisfies channel quality, satisfies PLMN, is not barred, etc.).
  • Acceptable cells are cells that only support restricted services, such as emergency services.
  • a suitable cell is a cell that communicates normally, supports slicing but does not support the target slicing.
  • Acceptable cells are cells that do not support slicing.
  • the suitable cell is the cell with the best channel quality among the cells that do not support the target slicing; the acceptable cell is the cell with the best channel quality among the cells that do not support the slicing.
  • a suitable cell and an acceptable cell may also have other meanings, which are not specifically limited in this embodiment of the present application.
  • the method further includes:
  • Second cell or the second frequency point performs the connection process for the second cell or the cell corresponding to the second frequency point; or, camp on a suitable or acceptable cell that does not support the target slice or, access a suitable or acceptable cell that does not support the target slice.
  • camping refers to maintaining a non-connected state with the corresponding cell.
  • the second cell or a cell corresponding to the second frequency point is a cell that does not support the target slice, and/or a suitable or acceptable cell. That is, the second cell or the cell corresponding to the second frequency point is a cell that does not support the target slice; or, the second cell or the cell corresponding to the second frequency point is a suitable or acceptable cell; or, the second cell The cell or the cell corresponding to the second frequency point is a suitable or acceptable cell that does not support the target slice.
  • the first timer is stopped if the second cell or the second frequency point is searched.
  • the first state of the wireless connection is switched to the second state if the first timer expires.
  • the above-mentioned wireless connection is an RRC connection.
  • the first state is a connected state
  • the second state is an idle state.
  • the first timer times out for the first time, indicating that there is no first cell or first frequency point that can be connected and supports the target slice.
  • Restarting the first timer searches for the second cell or the second frequency point and connects to the second cell or the cell corresponding to the second frequency point, which saves the overall connection time and prevents the service function of the terminal from being interrupted for too long.
  • FIG. 4 shows a flowchart of a cell selection method provided by another embodiment of the present application, and the method can be applied to the terminal device shown in FIG. 1 .
  • the method may include the following steps (410-450):
  • Step 410 start the first timer and the second timer.
  • the first timer is used for the terminal equipment to perform a cell selection process
  • the second timer is used for the terminal equipment to search for the first cell or the first frequency point supporting the target slice.
  • the duration of the second timer is shorter than the duration of the first timer, and the first timer and the second timer are started simultaneously.
  • the first cell or a cell corresponding to the first frequency point is a suitable or acceptable cell.
  • the first timer is T311.
  • the duration of the second timer is configured to the terminal device through RRC dedicated signaling or a system broadcast message.
  • Step 420 Search for a first cell or a first frequency point that supports the target slice.
  • Step 430 If the first cell or the first frequency point is searched, a connection process for the first cell or the cell corresponding to the first frequency point is performed.
  • the second timer is stopped, and/or the first timer is stopped. That is, if the first cell or the first frequency point is searched, the first timer is stopped; or, if the first cell or the first frequency point is searched, the second timer is stopped; or, if the first cell or the first frequency point is searched for cell or the first frequency point, stop the first timer and stop the second timer.
  • Step 440 if the second timer times out, search for a second cell or a second frequency point.
  • Step 450 if the second cell or the second frequency point is searched, the connection process for the second cell or the cell corresponding to the second frequency point is performed; or, if the target slice is not supported but suitable or acceptable or, access a suitable or acceptable cell that does not support the target slice.
  • the first timer is stopped if the second cell or the second frequency point is searched.
  • the above-mentioned wireless connection is an RRC connection.
  • the first state is a connected state
  • the second state is an idle state.
  • the cell selection and the search for the first cell or the first frequency point supporting the target slice are performed synchronously, and the first cell or the first frequency point that supports the target slice is preferentially connected.
  • the first cell or the cell corresponding to the first frequency point searched by the second timer if the first cell or the first frequency point that supports the target slice cannot be searched before the second timer expires, the Connecting to the searched second cell or the cell corresponding to the second frequency point before the timeout saves the search time and the overall connection time, and improves the connection efficiency.
  • FIG. 5 shows a flowchart of a cell selection method provided by another embodiment of the present application, and the method can be applied to the terminal device shown in FIG. 1 .
  • the method may include the following steps (510-530):
  • Step 510 start a second timer.
  • the second timer is used by the terminal device to search for the first cell or the first frequency point that supports the target slice.
  • the first cell or a cell corresponding to the first frequency point is a suitable or acceptable cell.
  • Step 520 Search for a first cell or a first frequency point that supports the target slice.
  • Step 530 if the first cell or the first frequency point is searched, a connection process for the first cell or the frequency point corresponding to the first cell is performed.
  • the second timer is stopped.
  • Step 540 if the second timer times out, start the first timer, and the first timer is used for the terminal device to perform the cell selection process.
  • the first timer is T311.
  • Step 550 search for a second cell or a second frequency point.
  • Step 560 if the second cell or the second frequency point is searched, execute the connection process for the second cell or the cell corresponding to the second frequency point; or, access a suitable or acceptable cell that does not support the target slice.
  • the first timer is stopped if the second cell or the second frequency point is searched.
  • the above-mentioned wireless connection is an RRC connection.
  • the first state is a connected state
  • the second state is an idle state.
  • the first cell or the first frequency point supporting the target slice is searched by first starting the second timer, and if the second timer times out, the first The timer searches for the second cell and the second frequency point; if the second timer does not expire, the first timer does not need to be restarted, which saves processing resources compared to synchronously starting the first timer and the second timer.
  • FIG. 6 shows a flowchart of a cell selection method provided by another embodiment of the present application, and the method can be applied to the terminal device shown in FIG. 1 .
  • the method may include the following steps (610-620):
  • Step 610 in the case that the terminal device is handed over from the cell of the first communication system to the cell of the second communication system, receive a handover command from the network device.
  • the handover command is MobilityFromEUTRACommand.
  • the handover command (eg MobilityFromEUTRACommand) includes identification information of the target slice and/or frequency information corresponding to the target slice, and the terminal device can determine the target slice by receiving and identifying the handover command sent by the network device.
  • the frequency information corresponding to the target slice is the frequency point corresponding to the target slice, which means that the frequency point or the cell corresponding to the frequency point supports the target slice.
  • switching from the cell of the first communication system to the cell of the second communication system is caused by the service requirements of the target slice, such as the inter-RAT (inter Radio Access Technology, inter-system) caused by the service requirements of the target slice. radio access technology) handover. That is, the cell of the first communication system does not support or no longer supports the target slice, and the terminal device has a service requirement to connect with the cell supporting the target slice (that is, the terminal device needs to connect to the cell supporting the target slice), so the terminal device executes A process of handover from a cell of a first communication system to a cell of a second communication system.
  • the service requirements of the target slice such as the inter-RAT (inter Radio Access Technology, inter-system) caused by the service requirements of the target slice. radio access technology
  • the first communication system is an LTE (Long Term Evolution, Long Term Evolution) system
  • the second communication system is an NR system
  • the LTE system does not include target slices required by services
  • the NR system includes targets required by services Slices, so the terminal device needs to switch from the connected cell of the LTE system to the connection to the cell of the NR system.
  • Step 620 in the case of cell handover failure, try to perform cell selection on the frequency corresponding to the target slice, or search for a suitable cell that supports the target slice to camp on, or perform a connection establishment process on the cell corresponding to the frequency corresponding to the target slice , or perform the connection establishment process on the cell corresponding to the target slice.
  • the method further includes: if the corresponding cell is not selected or searched for, performing a cell selection process, and searching for a suitable cell. or acceptable cells to camp on or initiate a connection establishment procedure.
  • a cell is selected by receiving a handover command sent by a network device, so as to switch to a cell of a different communication system, so that the communication system conforms to the service of the terminal device as much as possible. requirements, and improve the service processing capability of terminal equipment.
  • FIG. 7 shows a block diagram of a cell selection apparatus provided by an embodiment of the present application.
  • the apparatus has the function of implementing the above example of the cell selection method, and the function may be implemented by hardware or by executing corresponding software in hardware.
  • the apparatus may be the terminal device described above, or may be set in the terminal device.
  • the apparatus 700 may include: a cell connection module 710 .
  • the cell connection module 710 is configured to perform a connection process for the first cell or a cell corresponding to the first frequency after determining the first cell or the first frequency that supports the target slice.
  • the terminal device by determining the first cell or the first frequency that supports the target slice, the terminal device is connected to the first cell or the cell corresponding to the first frequency, so that the terminal In the process of performing cell handover, the device regards whether the target slice is supported as the priority condition for cell selection, and handovers in place as much as possible at one time. Compared with the terminal device that accesses an inappropriate cell, cell selection and handover need to be performed again. , the embodiments of the present application help to save signaling overhead and shorten service service delay.
  • the cell connection module 710 is used to:
  • the cell connection module 710 is further configured to:
  • the first timer is stopped.
  • the cell connection module 710 is further configured to:
  • the process either, camps on a suitable or acceptable cell that does not support the target slice, or accesses a suitable or acceptable cell that does not support the target slice.
  • the cell connection module 710 is further configured to:
  • the cell connection module 710 is further configured to:
  • the first timer is stopped.
  • the cell connection module 710 is further configured to:
  • the cell connection module 710 is used to:
  • the duration of the second timer is less than the duration of the first timer.
  • the cell connection module 710 is further configured to:
  • the second timer is stopped, and/or the first timer is stopped.
  • the cell connection module 710 is further configured to:
  • the cell connection module 710 is further configured to:
  • the first timer is stopped.
  • the cell connection module 710 is further configured to:
  • the cell connection module 710 is used to:
  • the second timer is used by the terminal device to search for a first cell or a first frequency point that supports the target slice;
  • the cell connection module 710 is further configured to:
  • the second timer is stopped.
  • the cell connection module 710 is further configured to:
  • the second timer times out, start a first timer, where the first timer is used for the terminal device to perform a cell selection process
  • the cell connection module 710 is further configured to:
  • the first timer is stopped.
  • the cell connection module 710 is further configured to:
  • the duration of the second timer is configured to the terminal device through a radio resource control RRC dedicated signaling or a system broadcast message.
  • the first state is a connected state and the second state is an idle state.
  • the second cell or a cell corresponding to the second frequency point is a cell that does not support the target slice and/or is a suitable or acceptable cell.
  • the first cell or a cell corresponding to the first frequency point is a suitable or acceptable cell.
  • the terminal device preferentially selects a first cell or a first frequency point that supports the target slice under the condition that at least one of the following conditions is satisfied for connection or, after determining the first cell or the first frequency point that supports the target slice, perform a connection process for the first cell or the cell corresponding to the first frequency point: the terminal device supports the slice device, the terminal device is a device of a specific version, the terminal device is a device that supports a specific slice, is having a slice business or a specific slice business service, has established a session corresponding to a slice or a session corresponding to a specific slice, has received the first Indication information; wherein the first indication information is used to instruct the terminal device to preferentially select a first cell or a first frequency point that supports the target slice for access, or to instruct the terminal device to determine After supporting the first cell or the first frequency point of the target slice, a connection procedure for the first cell or the cell corresponding to the first frequency point is performed.
  • the target slice is any one of the following slices: a slice corresponding to a currently activated session, a currently activated slice, a slice corresponding to a currently activated session with the highest priority, a currently activated session with the highest priority Slices, required slices, slices corresponding to sessions to be established, slices to be established, slices with specific identifiers, specific slices corresponding to at least one of activated sessions, and specific slices corresponding to at least one of sessions to be established .
  • the target slice is indicated to the access stratum AS by the non-access stratum NAS, or the target slice is selected by the AS.
  • the information of the first cell or the first frequency point is saved and valid by the terminal device.
  • connection process is a connection re-establishment process.
  • the apparatus 700 further includes: a command receiving module 720 .
  • the command receiving module 720 is configured to receive a handover command from a network device when the terminal device is handed over from a cell of the first communication system to a cell of the second communication system.
  • the cell connection module 710 is further configured to: in the case of cell handover failure, try to perform cell selection on the frequency corresponding to the target slice, or search for a suitable cell to support the target slice to camp on, or The connection establishment process is performed on the cell corresponding to the frequency corresponding to the target slice, or the connection establishment process is performed on the cell corresponding to the target slice.
  • the cell connection module 710 is further configured to:
  • a cell selection process is performed to search for a suitable or acceptable cell to camp on.
  • the switching command includes identification information of the target slice and/or frequency information corresponding to the target slice.
  • the handover from the cell of the first communication system to the cell of the second communication system is caused by the traffic requirements of the target slice.
  • the device provided in the above embodiment realizes its functions, only the division of the above functional modules is used as an example for illustration. In practical applications, the above functions can be allocated to different functional modules according to actual needs. That is, the content structure of the device is divided into different functional modules to complete all or part of the functions described above.
  • FIG. 8 shows a schematic structural diagram of a terminal device 80 provided by an embodiment of the present application.
  • the terminal device 80 may include: a processor 81 , a memory 82 and a bus 83 .
  • the processor 81 includes one or more processing cores, and the processor 81 executes various functional applications and information processing by running software programs and modules.
  • the memory 82 is connected to the processor 81 through a bus 83 .
  • the memory 82 can be used to store a computer program, and the processor 81 is used to execute the computer program, so as to implement each step performed by the terminal device in the above method embodiments.
  • the memory 82 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, and the volatile or non-volatile storage device includes but is not limited to: RAM (Random-Access Memory, random access memory) and ROM (Read-Only Memory), EPROM (Erasable Programmable Read-Only Memory, Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory, Electrically Erasable Programmable Read-Only Memory) memory), flash memory or other solid-state storage technology, CD-ROM (Compact Disc Read-Only Memory), DVD (Digital Video Disc, high-density digital video disc) or other optical storage, tape cassettes, magnetic tapes, magnetic disks storage or other magnetic storage devices.
  • RAM Random-Access Memory, random access memory
  • ROM Read-Only Memory
  • EPROM Erasable Programmable Read-Only Memory
  • EEPROM Electrically Erasable Programmable Read-Only Memory
  • flash memory or other solid-
  • the processor 81 is configured to perform a connection process for the first cell or a cell corresponding to the first frequency after determining the first cell or the first frequency that supports the target slice.
  • the processor 81 is used to:
  • the processor 81 is further configured to:
  • the first timer is stopped.
  • the processor 81 is further configured to:
  • the first timer If the first timer expires, perform a connection procedure for the second cell or a cell corresponding to the second frequency point, or camp on a suitable or acceptable cell that does not support the target slice, or , access a suitable or acceptable cell that does not support the target slice.
  • the processor 81 is further configured to:
  • the processor 81 is further configured to:
  • the first timer is stopped.
  • the processor 81 is further configured to:
  • the processor 81 is used to:
  • the duration of the second timer is less than the duration of the first timer.
  • the processor 81 is further configured to:
  • the second timer is stopped, and/or the first timer is stopped.
  • the processor 81 is further configured to:
  • the processor 81 is further configured to:
  • the first timer is stopped.
  • the processor 81 is further configured to:
  • the processor 81 is further configured to:
  • the second timer is used by the terminal device to search for a first cell or a first frequency point that supports the target slice;
  • the processor 81 is further configured to:
  • the second timer is stopped.
  • the processor 81 is further configured to:
  • the second timer times out, start a first timer, where the first timer is used for the terminal device to perform a cell selection process
  • the processor 81 is further configured to:
  • the first timer is stopped.
  • the processor 81 is further configured to:
  • the duration of the second timer is configured to the terminal device through a radio resource control RRC dedicated signaling or a system broadcast message.
  • the first state is a connected state and the second state is an idle state.
  • the second cell or a cell corresponding to the second frequency point is a cell that does not support the target slice and/or is suitable or acceptable.
  • the first cell or a cell corresponding to the first frequency point is a suitable or acceptable cell.
  • the terminal device preferentially selects a first cell or a first frequency point that supports the target slice for connection when it is determined that at least one of the following conditions is satisfied. or, after determining the first cell or the first frequency point that supports the target slice, perform the connection process for the first cell or the cell corresponding to the first frequency point: the terminal device supports the slice device, the terminal device is a device of a specific version, the terminal device is a device that supports a specific slice, is having a slice business or a specific slice business service, has established a session corresponding to a slice or a session corresponding to a specific slice, has received the first Indication information; wherein the first indication information is used to instruct the terminal device to preferentially select a first cell or a first frequency point that supports the target slice for access, or to instruct the terminal device to determine After supporting the first cell or the first frequency point of the target slice, a connection procedure for the first cell or the cell corresponding to the first frequency point is performed.
  • the target slice is any one of the following slices: a slice corresponding to a currently activated session, a currently activated slice, a slice corresponding to a currently activated session with the highest priority, a currently activated session with the highest priority Slices, required slices, slices corresponding to sessions to be established, slices to be established, slices with specific identifiers, specific slices corresponding to at least one of activated sessions, and specific slices corresponding to at least one of sessions to be established .
  • the target slice is indicated to the access stratum AS by the non-access stratum NAS, or the target slice is selected by the AS.
  • the information of the first cell or the first frequency point is saved and valid by the terminal device.
  • connection process is a connection re-establishment process.
  • the terminal device further includes a transceiver 84 connected to the processor 81, and the transceiver 84 may include a receiver 85 and a transmitter 86; wherein:
  • the transceiver 84 is configured to receive a handover command from a network device when the terminal device is handed over from a cell of the first communication system to a cell of the second communication system;
  • the processor 81 is further configured to attempt to perform cell selection on the frequency corresponding to the target slice in the case of cell handover failure, or search for a suitable cell to support the target slice to camp on, or to camp on the target slice.
  • the connection establishment process is performed on the cell corresponding to the corresponding frequency, or the connection establishment process is performed on the cell corresponding to the target slice.
  • the processor 81 is further configured to:
  • a cell selection process is performed to search for a suitable or acceptable cell to camp on.
  • the switching command includes identification information of the target slice and/or frequency information corresponding to the target slice.
  • the handover from the cell of the first communication system to the cell of the second communication system is caused by the traffic requirements of the target slice.
  • Embodiments of the present application further provide a computer-readable storage medium, where a computer program is stored in the storage medium, and the computer program is configured to be executed by a processor of a network device to implement the above cell selection method.
  • Embodiments of the present application further provide a chip, where the chip includes a programmable logic circuit and/or program instructions, and when the chip runs on a network device, it is used to implement the above cell selection method.
  • the embodiment of the present application also provides a computer program product, which when the computer program product runs on the processor of the terminal device, enables the terminal device to execute the above cell selection method.
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a storage medium can be any available medium that can be accessed by a general purpose or special purpose computer.

Abstract

L'invention concerne un procédé et un appareil de sélection de cellule, ainsi qu'un terminal et un support de stockage, qui se rapportent au domaine technique des communications. Le procédé comprend : après avoir déterminé une première cellule ou un premier point de fréquence qui prend en charge une tranche cible, exécution d'un processus de connexion pour la première cellule ou une cellule correspondant au premier point de fréquence. Au moyen de la solution technique fournie dans les modes de réalisation de la présente invention, pendant le processus d'exécution d'une commutation de cellule, un terminal prend, en tant que condition de priorité pour la sélection de cellule, la prise en charge ou non d'une tranche cible, afin d'effectuer une commutation unique sur place, de sorte que des surcharges de signalisation sont enregistrées et qu'un retard de service commercial est raccourci par rapport à la situation dans laquelle, après qu'un dispositif terminal accède à une cellule inappropriée, il est nécessaire d'effectuer à nouveau une sélection et une commutation de cellule.
PCT/CN2020/138095 2020-12-21 2020-12-21 Procédé et appareil de sélection de cellule, et terminal et support de stockage WO2022133677A1 (fr)

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PCT/CN2020/138095 WO2022133677A1 (fr) 2020-12-21 2020-12-21 Procédé et appareil de sélection de cellule, et terminal et support de stockage
CN202080105094.2A CN116648951A (zh) 2020-12-21 2020-12-21 小区选择方法、装置、终端及存储介质

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