WO2022204914A1 - Procédé de resélection de cellule, dispositif et support de stockage - Google Patents

Procédé de resélection de cellule, dispositif et support de stockage Download PDF

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Publication number
WO2022204914A1
WO2022204914A1 PCT/CN2021/083834 CN2021083834W WO2022204914A1 WO 2022204914 A1 WO2022204914 A1 WO 2022204914A1 CN 2021083834 W CN2021083834 W CN 2021083834W WO 2022204914 A1 WO2022204914 A1 WO 2022204914A1
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WIPO (PCT)
Prior art keywords
cell reselection
terminal device
information
cell
result
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PCT/CN2021/083834
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English (en)
Chinese (zh)
Inventor
杨皓睿
付喆
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Oppo广东移动通信有限公司
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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/CN2021/083834 priority Critical patent/WO2022204914A1/fr
Priority to CN202180078569.8A priority patent/CN116491163A/zh
Publication of WO2022204914A1 publication Critical patent/WO2022204914A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the embodiments of the present application relate to the field of communications technologies, and in particular, to a cell reselection method, device, and storage medium.
  • network slicing As a key technology of the fifth generation (5th generation, 5G) wireless communication network, network slicing (slice) has received extensive attention and Research. Network slicing can be customized for different services or manufacturers. Different services require different network slices. One terminal device can support and access multiple network slices at the same time.
  • the terminal equipment needs to perform cell reselection.
  • the terminal device can perform cell reselection only considering the signal quality of the cell.
  • the terminal device needs to consider not only the signal quality of the cell, but also the network slice of the cell. Therefore, how a terminal device determines which cell reselection manner to use for cell reselection is a technical problem that needs to be solved at present.
  • Embodiments of the present application provide a cell reselection method, device, and storage medium, which reduce the complexity of changing cells by a terminal and reduce the power consumption of the terminal.
  • an embodiment of the present application provides a cell reselection method, including: a terminal device determines a cell reselection mode; the terminal device performs cell reselection according to the determined cell reselection mode.
  • an embodiment of the present application provides a method for cell reselection, including: the terminal device receives first information from a network device, where the first information at least includes first indication information, and the first indication information uses is used to indicate the cell reselection mode used by the terminal device; the terminal device determines the cell reselection mode according to the first information; the terminal device performs cell reselection according to the determined cell reselection mode.
  • an embodiment of the present application provides a method for cell reselection, including: a network device determining first information, where the first information at least includes first indication information, and the first indication information is used to indicate a cell used by a terminal device. Cell reselection mode; the network device sends the first information to the terminal device.
  • an embodiment of the present application provides a terminal device, including a processing module, where the processing module is configured to determine a cell reselection mode; and perform cell reselection according to the determined cell reselection mode.
  • an embodiment of the present application provides a network device, including a processing module and a sending module, where the processing module is configured to determine first information, where the first information at least includes first indication information, and the first indication information is used for Indicates the cell reselection mode used by the terminal device; the sending module is configured to send the first information to the terminal device.
  • embodiments of the present application provide a terminal device, a memory, and a processor, where the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the processing A computer runs the computer program to perform the method according to the first aspect of the present application.
  • an embodiment of the present application provides a network device, a memory, and a processor, where the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the processing A computer runs the computer program to perform the method according to the second aspect of the present application.
  • an embodiment of the present application provides a computer storage medium for storing a computer program, and when the computer program runs on a computer, the computer causes the computer to execute the method described in the first aspect of the present application.
  • an embodiment of the present application provides a computer storage medium for storing a computer program, and when the computer program runs on a computer, the computer causes the computer to execute the method according to the second aspect of the present application.
  • an embodiment of the present application provides a computer program product, which, when the computer program product runs on a computer, causes the computer to execute the method according to the first aspect of the present application.
  • an embodiment of the present application provides a computer program product, which, when the computer program product runs on a computer, causes the computer to execute the method described in the second aspect of the present application.
  • Embodiments of the present application provide a cell reselection method, device, and storage medium.
  • the method includes: a terminal device determines a cell reselection mode according to whether the terminal device is currently outside the terminal device registration area RA. If the terminal device is about to leave or has left the RA, the terminal device needs to perform cell reselection based on the network slice and signal quality of the cell; if the terminal device is in the RA, the terminal device only needs to perform cell reselection based on the signal quality of the cell.
  • the terminal device considers network slices supported by surrounding cells in cell reselection only when it is about to leave or has left the RA, thereby reducing the complexity of changing cells in the RA and reducing the power consumption of the terminal device.
  • FIG. 1 is a schematic diagram of a network architecture provided by an embodiment of the present application.
  • FIG. 2 is a schematic diagram of an end-to-end control plane protocol stack between a terminal and a core network
  • Fig. 3 is the structural representation of S-NSSAI
  • FIG. 4 is a schematic flowchart of a UE registering a network slice
  • FIG. 5 is a schematic flowchart of a cell reselection method provided by an embodiment of the present application.
  • FIG. 6 is an interactive schematic diagram 1 of determining a cell reselection mode by a terminal device according to an embodiment of the present application
  • FIG. 7 is an interactive schematic diagram 2 of determining a cell reselection mode by a terminal device according to an embodiment of the present application
  • FIG. 8 is an interactive schematic diagram of a cell reselection method provided by an embodiment of the present application.
  • FIG. 9 is a schematic diagram 3 of interaction for determining a cell reselection mode by a terminal device according to an embodiment of the present application.
  • FIG. 10 is a fourth interactive schematic diagram of a terminal device determining a cell reselection mode according to an embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of a terminal device provided by an embodiment of the application.
  • FIG. 12 is a schematic structural diagram of a network device provided by an embodiment of the present application.
  • FIG. 13 is a schematic diagram of a hardware structure of a terminal device provided by an embodiment of the present application.
  • FIG. 14 is a schematic diagram of a hardware structure of a network device provided by an embodiment of the present application.
  • FIG. 1 is a schematic diagram of a network architecture provided by an embodiment of the present application.
  • the 5G network architecture released by the 3GPP standards group includes:
  • Terminal including user equipment, UE), access network supporting 3GPP technology (including radio access network, RAN or access network, AN), user plane function (UPF) network element, access and mobility management functions (access and mobility management function, AMF) network element, session management function (session management function, SMF) network element, policy control function (policy control function, PCF) network element, application function (application function, AF), data network ( data network, DN), network slice selection function (NSSF), authentication service function (Authentication Server Function, AUSF), unified data management function (Unified Data Management, UDM).
  • the 5G network architecture shown in FIG. 1 does not constitute a limitation of the 5G network architecture.
  • the 5G network architecture may include more or less network elements than the one shown in the figure, or Combine certain network elements, etc.
  • the AN or RAN is represented in FIG. 1 in terms of (R)AN.
  • the terminal can be a user equipment (UE), a handheld terminal, a notebook computer, a subscriber unit, a cellular phone, a smart phone, a wireless data card, a personal digital assistant , PDA) computer, tablet computer, wireless modem (modem), handheld device (handheld), laptop computer (laptop computer), cordless phone (cordless phone) or wireless local loop (wireless local loop, WLL) station, Machine type communication (MTC) terminals, handheld devices with wireless communication capabilities, computing devices, processing devices connected to wireless modems, drones, in-vehicle devices, wearable devices, terminals in the Internet of Things, virtual reality equipment, terminal equipment in the future 5G network, terminals in the future evolved public land mobile network (PLMN), etc.
  • UE user equipment
  • PDA personal digital assistant
  • MTC Machine type communication
  • An access network device is an access device that a terminal wirelessly accesses into the network architecture, and is mainly responsible for radio resource management, quality of service (QoS) management, data compression, and encryption on the air interface side.
  • base station NodeB evolved base station eNodeB, base station in 5G mobile communication system or new generation wireless (new radio, NR) communication system, base station in future mobile communication system, etc.
  • the UPF network element, the AMF network element, the SMF network element, and the PCF network element are network elements of the 3GPP core network (abbreviation: core network network element).
  • UPF network elements can be called user plane function network elements, which are mainly responsible for the transmission of user data.
  • Other network elements can be called control plane function network elements, which are mainly responsible for authentication, authentication, registration management, session management, mobility management and policy control. etc. to ensure reliable and stable transmission of user data.
  • UPF network elements can be used to forward and receive terminal data.
  • the UPF network element can receive service data from the data network and transmit it to the terminal through the access network device; the UPF network element can also receive user data from the terminal through the access network device and forward it to the data network.
  • the transmission resources allocated and scheduled by the UPF network element for the terminal are managed and controlled by the SMF network element.
  • the bearer between the terminal and the UPF network element may include: a user plane connection between the UPF network element and the access network device, and establishing a channel between the access network device and the terminal.
  • the user plane connection is a quality of service (quality of service, QoS) flow (flow) that can establish transmission data between the UPF network element and the access network device.
  • QoS quality of service
  • the AMF network element can be used to manage terminal access to the core network, such as: terminal location update, network registration, access control, terminal mobility management, terminal attachment and detachment, and so on.
  • the AMF network element may also provide storage resources of the control plane for the session in the case of providing services for the session of the terminal, so as to store the session identifier, the SMF network element identifier associated with the session identifier, and the like.
  • the SMF network element can be used to select a user plane network element for the terminal, redirect the user plane network element for the terminal, assign an Internet Protocol (IP) address to the terminal, and establish a bearer between the terminal and the UPF network element (also called session), session modification, release, and QoS control.
  • IP Internet Protocol
  • the PCF network element is used to provide policies, such as QoS policies and slice selection policies, to the AMF network elements and the SMF network elements.
  • the AF network element is used to interact with the 3GPP core network element to support the routing of applications affecting data, to access the network exposure function, and to interact with the PCF network element for policy control.
  • the DN can provide data services for users such as IP multi-media service (IMS) networks and the Internet.
  • IMS IP multi-media service
  • AS application servers
  • the AS can implement the function of AF.
  • NSSF is used for the selection of network slices, and the supported functions include: selecting the set of network slice instances serving the UE; determining the allowed network slice selection assistance information (NSSAI), and determining a single contract to sign when needed.
  • NSSAI network slice selection assistance information
  • S-NSSAI Mapping of Network Slice Selection Assistance Information (S-NSSAI); determine the configured NSSAI, and if needed, the mapping to the subscribed S-NSSAI; determine the AMF set that may be used to query the UE , or determine a list of candidate AMFs based on the configuration.
  • the AUSF is used to receive the AMF's request for authentication of the terminal, by requesting the key from the UDM, and then forwarding the issued key to the AMF for authentication processing.
  • UDM includes functions such as generation and storage of user subscription data, management of authentication data, and supports interaction with external third-party servers.
  • Each network element in FIG. 1 can be either a network element in a hardware device, a software function running on dedicated hardware, or a virtualized function instantiated on a platform (eg, a cloud platform). It should be noted that, in the network architecture shown in the above figures, the network elements included in the entire network architecture are merely illustrated. In the embodiments of the present application, the network elements included in the entire network architecture are not limited.
  • each interface has a peer-to-peer protocol function corresponding to it.
  • the following is a brief introduction to the end-to-end protocol stack in the 5G system.
  • FIG. 2 is a schematic diagram of an end-to-end control plane protocol stack between a terminal and a core network.
  • the control plane is used to carry the interactive signaling between the terminal and the network side.
  • the data transfer of the control plane is realized through the Uu interface-N2 interface-N11 interface, and the signaling between different network elements adopts the peer protocol stack. way to achieve.
  • the access layer of the terminal includes from bottom to top: physical (PHY) layer, media access control (MAC) layer, radio link control (radio link control, RLC) layer, packet data convergence protocol (packet data convergence protocol, PDCP) layer, radio resource control (radio resource control, RRC) layer.
  • the non-access layer of the terminal device includes: a non-access mobility management (NAS mobile management, NAS-MM) layer and a non-access session management (NAS session management, NAS-SM) layer.
  • NAS-SM and NAS-MM belong to the non-access stratum (NAS layer) protocol of the N1 interface.
  • NAS-SM supports the session management function between the terminal and the SMF network element
  • NAS-MM supports the communication between the terminal and the AMF network element.
  • Inter-connect mobility management functions such as registration management, connection management, activation and deactivation of user plane connections, etc.
  • wireless communication networks need to cope with various emerging application scenarios, such as Enhanced Mobile Broadbrand (eMBB), Ultra-Reliable Low Latency Communication (Ultra-Reliable Low Latency Communication, URLLC), Massive Internet of Things (MIoT), vehicle networking technology (Verticle to Everything, V2X), etc.
  • eMBB Enhanced Mobile Broadbrand
  • URLLC Ultra-Reliable Low Latency Communication
  • MIoT Massive Internet of Things
  • V2X vehicle networking technology
  • Network slicing is one of the key technologies of 5G, which refers to the distribution and management of network data. Its essence is to divide the existing physical network into multiple different types of virtual networks at the logical level. It is divided by indicators such as delay level, bandwidth size, reliability strength, etc., so as to cope with complex and changeable application scenarios. Network slicing can be customized for different services or manufacturers, and can also implement dedicated and isolated network resources. It can also provide better services while meeting the needs of different business scenarios.
  • the network slice identifier defined in the current standard may be S-NSSAI, and S-NSSAI is an end-to-end identifier, that is, a slice identifier that can be recognized by UE, base station, and core network equipment.
  • FIG. 3 is a schematic structural diagram of S-NSSAI.
  • S-NSSAI includes two parts, slice/service type (Slice/Service Type, SST) and slice differentiation (Slice Difference, SD).
  • SST is used to distinguish the scene types of network slicing applications, and it is located in the upper 8 bits of S-NSSAI.
  • SD is a more detailed distinction between different network slices under the SST level, and it is located in the lower 24 bits of S-NSSAI. For example, when SST is V2X, different car companies are distinguished by SD.
  • NSSAI NSSAI
  • Configured NSSAI Configured NSSAI
  • Default Configured NSSAI Default Configured NSSAI
  • requested NSSAI Request NSSAI
  • allowed NSSAI Allowed NSSAI
  • pending NSSAI Pending NSSAI
  • Rejected NSSAI Rejected NSSAI
  • the S-NSSAI in the NSSAI configured by default contains only the SST with standardized value, which is a parameter that can be recognized by all operators.
  • the S-NSSAI included in other NSSAIs will contain the values defined by the applicable operators and need to be associated with the applicable Public Land Mobile Network (PLMN).
  • PLMN Public Land Mobile Network
  • the UE can use this NSSAI only under its associated PLMN.
  • the ultimate purpose of the deployment of network slices is to provide services for UEs.
  • the UE needs to transmit service data in the network slice, the UE needs to first register in the network slice, and after receiving the permission of the network, establish a path for transmitting service data, that is, a Packet Data Unit (PDU) session.
  • PDU Packet Data Unit
  • FIG. 4 is a schematic flowchart of a UE registering a network slice. As shown in Figure 4, the registration request includes the following steps:
  • Step 1 The UE sends a registration request (Registration request) to the AMF according to the service, and the registration request includes the requested S-NSSAI.
  • Step 2 The AMF determines the allowed NSSAI according to the scope of UE subscription and network slice deployment.
  • Step 3 The AMF sends a registration response (Registration accept) to the UE, and the registration response includes the allowed NSSAI.
  • the AMF sends an N2 message to the base station RAN, and the N2 message also includes the allowed NSSAI.
  • the UE can establish a PDU session in the allowed slice in the NSSAI, and can send and receive data only after the PDU session is established.
  • the coverage of each slice may be different.
  • AMF decides the allowed NSSAI, it needs to ensure that all slices in the allowed NSSAI can cover the Registration area (RA) allocated by the AMF to the UE (ie registered TA list).
  • the AMF can obtain the S-NSSAI supported by the base station and the corresponding tracking area (TA) from the base station through NG setup request or RAN configuration update signaling.
  • the UE in the idle state can select a cell that can support UE services by reading the slice information supported by the base station broadcast in the system message.
  • the UE accesses the network based on the above-mentioned network slice registration process, and as the location of the UE changes, the UE needs to perform cell reselection.
  • the cells of the UE in the RA support the same network slice. In this way, when the UE performs cell reselection in the RA, it considers the signal quality of the surrounding cells and also considers the network slice, which will lead to a waste of UE resources and power.
  • the present application provides a cell reselection scheme, which aims to reduce unnecessary power consumption of the UE during the cell reselection process.
  • the inventive idea of the scheme is as follows: Considering that when the UE performs cell reselection in the RA, the cells in the RA support the same network slice, and the UE can only perform cell reselection based on the cell signal quality. It will affect the final selected cell, so it is necessary to further optimize the UE cell reselection scheme.
  • the cell reselection scheme provided by the present application involves at least two cell reselection methods.
  • the first cell reselection method is to perform cell reselection based on the signal quality of the cell
  • the second cell reselection method is to perform cell reselection based on the network slice and signal quality of the cell.
  • the terminal can determine which cell reselection mode to adopt by judging whether to leave the RA, and the terminal can also determine which cell reselection mode to adopt by receiving an instruction from the network side and then judging whether to leave the RA.
  • the terminal considers network slices supported by surrounding cells in cell reselection only when it is about to leave or has left the RA, thereby reducing the complexity of changing cells in the RA and reducing the power consumption of the terminal.
  • FIG. 5 is a schematic flowchart of a cell reselection method provided by an embodiment of the present application. As shown in FIG. 5 , the method provided in this embodiment is applied to a terminal device, and specifically includes the following steps:
  • Step 101 The terminal device determines a cell reselection mode.
  • the cell reselection manners that can be used by the terminal device include a first cell reselection manner and a second cell reselection manner.
  • the first cell reselection method is to perform cell reselection based on the signal quality of the cell, that is, the terminal device performs cell reselection according to the signal quality of the searched cell (or surrounding cells). If the signal quality of the searched cell is greater than or equal to With a preset threshold, the terminal device selects the cell.
  • the second cell reselection method is to perform cell reselection based on the network slice and signal quality of the cell, that is, the terminal device not only needs to obtain the signal quality of the searched cell, but also needs to obtain the network slice supported by the searched cell. If the network slice supported by the cell is consistent with the intended slice (intended slice) of the terminal device, and the signal quality of the searched cell is greater than or equal to the preset threshold, the terminal device selects the cell.
  • the intended slice can be the allowed NSSAI, the requested NSSAI, or the network slice used by the established PDU session.
  • the cell reselection manners that can be used by the terminal device are not limited to the above two cell reselection manners, and may also be other cell reselection manners.
  • the terminal device determines the frequency band to be used, and only searches the frequency band for cells that support the desired network slice and whose signal quality is greater than or equal to a preset threshold.
  • the terminal device preferentially selects a cell whose TAI is in the RA. If there is no cell whose TAI is in the RA, it selects a cell that supports the desired network slice and whose signal quality is greater than or equal to Cells with preset thresholds.
  • determining the cell reselection mode by the terminal device includes: determining the cell reselection mode by the access layer of the terminal device. Specifically, the access layer of the terminal device determines the cell reselection mode according to whether the terminal device wants to leave the registration area RA of the terminal device.
  • determining a cell reselection mode by a terminal device includes: a non-access stratum of the terminal device determines a first result, where the first result is used to indicate whether the terminal device wants to leave the RA of the terminal device, and the The non-access layer sends the first result to the access layer of the terminal device, and the access layer of the terminal device determines the cell reselection mode according to the first result.
  • whether the terminal device wants to leave the RA of the terminal device can be understood as the terminal device is leaving the current cell and searches for the system message of the adjacent cell. If the TAI in the searched system message is not in the RA, it is considered that The end device is to leave the RA.
  • the access layer of the terminal device may be a radio resource control (Radio Resource Control, RRC) layer.
  • RRC Radio Resource Control
  • Step 102 The terminal device performs cell reselection according to the determined cell reselection mode.
  • the cell reselection manner determined by the terminal device through the above steps includes the above-mentioned first cell reselection manner or the second cell reselection manner.
  • the terminal device determines the cell reselection mode according to whether the terminal device is currently outside the terminal device registration area RA. If the terminal device is about to leave or has left the RA, the terminal device needs to perform cell reselection based on the network slice and signal quality of the cell; if the terminal device is in the RA, the terminal device only needs to perform cell reselection based on the signal quality of the cell.
  • the terminal device considers network slices supported by surrounding cells in cell reselection only when it is about to leave or has left the RA, thereby reducing the complexity of changing cells in the RA and reducing the power consumption of the terminal device.
  • FIG. 6 is a schematic diagram 1 of the interaction of a terminal device determining a cell reselection mode according to an embodiment of the present application.
  • the method provided by this embodiment involves the interaction between the access layer and the non-access layer in the terminal device, and specifically includes follow the steps below:
  • Step 201 The non-access layer of the terminal device sends the registration area RA of the terminal device to the access layer of the terminal device.
  • the non-access stratum of the terminal device may acquire the RA of the terminal device from the AMF network element.
  • the non-access layer of the terminal device may also carry the intended slice while sending the RA of the terminal device to the access layer of the terminal device.
  • the access layer of the terminal device determines to use the second cell reselection mode to perform cell reselection, it needs to perform cell reselection in combination with the intended slice.
  • the access layer of the terminal device saves the RA and the intended slice (if received) of the terminal device for the judgment and cell reselection of the subsequent steps.
  • Step 202 The access layer of the terminal device determines a first result according to the TAI in the system message of the searched cell and the RA of the terminal device, where the first result is used to indicate whether the searched cell is in the RA.
  • the access layer of the terminal device will read the system messages of the surrounding cells each time the cell is changed, and the system messages include the Tracking Area Identity (TAI).
  • Tracking Area (TA) is a cell-level configuration. Multiple cells can be configured with the same TA, and a cell can only belong to one TA.
  • the access layer of the terminal device determines the first result by determining whether the TAI in the system message of the searched cell is within the RA of the terminal device. If the TAI is within the RA of the terminal equipment, the first result is used to indicate that the searched cell is within the RA; if the TAI is outside the RA of the terminal equipment, the first result is used to indicate that the searched cell is not within the RA.
  • Step 203 The access layer of the terminal device determines a cell reselection mode according to the first result.
  • the access layer of the terminal device determines to use the first cell reselection mode; if the first result is used to indicate that the searched cell is not in the RA, the terminal device The access stratum determines to use the second cell reselection mode.
  • the access layer of the terminal device uses the second cell reselection mode to perform cell reselection, including: the access layer of the terminal device determines whether the searched cell supports the network slice (intended slice) desired by the UE, and if the searched cell is found The cell supports the intended slice, and the signal quality of the searched cell is greater than or equal to the preset threshold, and the access layer of the terminal device selects the cell. It should be noted that, if the intended slice is not carried in the above step 201, the access layer of the terminal device needs to send a request to the non-access layer of the terminal device to obtain the intended slice.
  • the access layer of the terminal device determines whether the terminal device is currently outside the terminal device registration area RA, and determines the cell reselection method.
  • the terminal device considers network slices supported by surrounding cells in cell reselection only when it is about to leave or has left the RA, thereby reducing the complexity of changing cells in the RA and reducing the power consumption of the terminal device.
  • FIG. 7 is a second schematic diagram of interaction for determining a cell reselection manner by a terminal device according to an embodiment of the present application. As shown in FIG. 7 , the method provided in this embodiment involves the interaction between the access layer and the non-access layer in the terminal device, and specifically includes the following steps:
  • Step 301 The access layer of the terminal device sends the TAI in the system message of the searched cell to the non-access layer of the terminal device.
  • the access layer of the terminal device will read the system messages of the surrounding cells each time the cell is changed, the system messages include TAI, and send the TAI obtained from the system messages to the non-connector of the terminal device access layer, so that the non-access layer performs step 302.
  • Step 302 The non-access stratum of the terminal device determines a first result according to the TAI and the registration area RA of the terminal device, where the first result is used to indicate whether the searched cell is in the RA.
  • the non-access stratum of the terminal device determines the first result by determining whether the TAI is within the RA of the terminal device. If the TAI is within the RA of the terminal equipment, the first result is used to indicate that the searched cell is within the RA; if the TAI is outside the RA of the terminal equipment, the first result is used to indicate that the searched cell is not within the RA.
  • Step 303 The non-access layer of the terminal device sends the first result to the access layer of the terminal device.
  • Step 304 The access layer of the terminal device determines the cell reselection mode according to the first result.
  • Step 304 in this embodiment is the same as step 203 in the foregoing embodiment.
  • Step 304 in this embodiment is the same as step 203 in the foregoing embodiment.
  • the difference between the cell reselection method provided in this embodiment and the embodiment shown in FIG. 6 is that the non-access layer of the terminal device determines whether the terminal device is currently outside the terminal device registration area RA, and sends the determination result to the terminal The access layer of the device, so that the access layer determines the cell reselection mode according to the result.
  • the terminal device considers network slices supported by surrounding cells in cell reselection only when it is about to leave or has left the RA, thereby reducing the complexity of changing cells in the RA and reducing the power consumption of the terminal device.
  • the embodiments of the present application also provide a method for cell reselection.
  • the method involves interaction between a terminal device and a network device.
  • the terminal device determines a cell reselection method through information sent by the network device, and Cell reselection is performed based on the determined cell reselection manner.
  • FIG. 8 is an interactive schematic diagram of a cell reselection method provided by an embodiment of the present application. As shown in FIG. 8 , the method provided in this embodiment involves the interaction between a terminal device and a network device, where the network device may be an AMF network element, and the method specifically includes the following steps:
  • Step 401 The network device determines first information, where the first information at least includes first indication information, and the first indication information is used to indicate a cell reselection mode used by the terminal device.
  • the cell reselection method used by the terminal equipment indicated by the first indication information includes at least one of a first cell reselection method and a second cell reselection method, that is, the first indication information indicates whether the terminal equipment can use the first cell reselection method. selection mode and/or second cell reselection mode.
  • the first information further includes: second indication information, where the second indication information is used to indicate an applicable area of the cell reselection manner, and the applicable area of the cell reselection manner includes the first cell reselection manner The applicable area and/or the applicable area of the second cell reselection method.
  • the applicable area of the cell reselection method can be configured by the network.
  • the applicable area of the cell reselection method can be understood as the applicable range of the cell reselection method.
  • the applicable range of the second cell reselection manner is the entire PLMN, an NR cell or an E-UTRAN cell within the PLMN, and an RA or an NR cell or an E-UTRAN cell within the RA.
  • the first information further includes: a registration area RA of the terminal device.
  • the first information further includes: an allowed NSSAI of the terminal device.
  • the network device determining the first information includes: the network device determining the first information according to the location of the terminal device and/or the subscription information of the terminal device.
  • the subscription information of the terminal device includes the network slice (Subscribed NSSAI) subscribed by the terminal device.
  • the network device determines the allowed NSSAI of the terminal device in the first information, which specifically includes: after the AMF network element receives the registration request sent by the terminal device and carries the requested NSSAI, the AMF network element first Authenticate the terminal device, and if it passes, obtain the slice selection subscription data (Slice Selection Subscription Data) (that is, subscription information) of the terminal device from the UDM.
  • the AMF network element determines the allowed NSSAI of the terminal device in combination with the network slice subscribed by the terminal device and the requested NSSAI in the subscription information.
  • Step 402 The network device sends the first information to the terminal device.
  • the first information is carried in a non-access message.
  • the first information is carried in a network slice registration accept (Registration Accept) message.
  • Step 403 The terminal device determines a cell reselection mode according to the first information.
  • Step 404 The terminal device performs cell reselection according to the determined cell reselection mode.
  • FIG. 9 is an interactive schematic diagram 3 of a terminal device determining a cell reselection mode according to an embodiment of the present application. As shown in FIG. 9 , the terminal device determines a cell reselection mode, including the following steps:
  • Step 501 The non-access layer of the terminal device receives the first information from the network device.
  • Step 502 The non-access layer of the terminal device sends the RA of the terminal device to the access layer of the terminal device according to the first information.
  • the non-access layer of the terminal device when the non-access layer of the terminal device determines that the terminal device is located in the applicable area of the second cell reselection mode indicated by the second indication information in the first information, the non-access layer of the terminal device reports to the access layer of the terminal device. Send RA.
  • Step 503 The access layer of the terminal device determines the first result according to the tracking area identifier TAI in the system message of the searched cell and the RA of the terminal device.
  • the first result is used to indicate whether the searched cell is in the RA of the terminal device.
  • Step 504 The access layer of the terminal device determines the cell reselection mode according to the first result.
  • Step 503 and step 504 in this embodiment are the same as step 202 and step 203 in the foregoing embodiment.
  • step 202 and step 203 in the foregoing embodiment.
  • the access layer of the terminal device is triggered to analyze the location of the terminal device. If the terminal device is in its registration area RA, the access layer determines to use the first cell reselection method. If the terminal device is not in its RA, the access layer determines Use the second cell reselection method.
  • FIG. 10 is a schematic diagram 4 of interaction for determining a cell reselection mode by a terminal device according to an embodiment of the present application.
  • the terminal device determines a cell reselection mode, including the following steps:
  • Step 601 The non-access layer of the terminal device receives the first information from the network device.
  • Step 602 The access layer of the terminal device sends the TAI in the system message of the searched cell to the non-access layer of the terminal device.
  • the access stratum of the terminal equipment will report the TAI obtained in the system message of the searched cell to the non-access stratum of the terminal equipment during each cell reselection.
  • Step 603 The non-access stratum of the terminal device determines a first result according to the TAI in the system message of the searched cell and the first information, where the first result is used to indicate whether the searched cell is in the RA of the terminal device.
  • Step 604 The non-access layer of the terminal device sends the first result to the access layer of the terminal device.
  • the non-access stratum of the terminal device determines that the terminal device is located in the applicable area of the second cell reselection mode indicated by the second indication information in the first information, according to the system of the searched cell
  • the TAI in the message determines the first result and sends the first result to the access layer of the terminal device.
  • the non-access stratum of the terminal device determines the first result according to the TAI in the system message of the searched cell and the RA of the terminal device.
  • Step 605 The access layer of the terminal device determines the cell reselection mode according to the first result.
  • Steps 603 to 605 in this embodiment are the same as steps 302 to 304 in the above-mentioned embodiment.
  • steps 302 to 304 in the above-mentioned embodiment For details, reference may be made to the above-mentioned embodiment, and details are not repeated here.
  • the terminal equipment location analysis is carried out, and the location judgment result is sent to the access layer. If the judgment result indicates that the terminal equipment is in its registration area RA, the access layer determines to use the first cell reselection method. If the judgment result indicates that the terminal equipment is not in the In its RA, the access layer determines to use the second cell reselection mode.
  • the terminal device receives the first information sent by the network device, the first information at least includes first indication information and second indication information, and the first indication information is used to indicate the terminal device can use
  • the second indication information is used to indicate the applicable scope of the cell reselection mode.
  • the terminal device can directly use the first cell reselection mode to perform cell reselection, thereby reducing the complexity of the terminal device when changing cells. to reduce the power consumption of the terminal equipment.
  • the cell reselection method provided by the embodiment of the present application is described in detail above, and the terminal device and the network device provided by the embodiment of the present application will be described below.
  • FIG. 11 is a schematic structural diagram of a terminal device provided by an embodiment of the present application.
  • the terminal device 700 provided by the embodiment of the present application includes: a processing module 701 .
  • a processing module 701 configured to determine a cell reselection mode
  • the cell reselection is performed according to the determined cell reselection mode.
  • the cell reselection manner determined by the processing module 701 includes: a first cell reselection manner or a second cell reselection manner;
  • the first cell reselection manner is to perform cell reselection based on the signal quality of the cell
  • the second cell reselection manner is to perform cell reselection based on the network slice of the cell and the signal quality.
  • processing module 701 is specifically used for:
  • the access layer determines a first result according to the tracking area identifier TAI in the system message of the searched cell and the RA, and the first result is used to indicate whether the searched cell is in the RA;
  • the cell reselection mode is determined at the access layer according to the first result.
  • processing module 701 is specifically used for:
  • a first result is determined at the non-access stratum according to the TAI and the RA of the terminal device, where the first result is used to indicate whether the searched cell is within the RA;
  • the cell reselection mode is determined at the access layer according to the first result.
  • the device further includes: a receiving module 702;
  • the receiving module 702 is configured to receive first information from a network device, where the first information includes at least first indication information, and the first indication information is used to indicate the terminal The cell reselection method used by the device;
  • the processing module 701 is specifically configured to determine a cell reselection mode according to the first information.
  • the receiving module 702 is specifically configured to:
  • the first information from the network device is received at the non-access stratum.
  • the first information further includes: second indication information, where the second indication information is used to indicate an applicable area of the cell reselection mode.
  • the first information further includes: the RA of the terminal device.
  • processing module 701 is specifically used for:
  • the access layer determines a first result according to the tracking area identifier TAI in the system message of the searched cell and the RA, where the first result is used to indicate whether the searched cell is in the RA;
  • the cell reselection mode is determined at the access layer according to the first result.
  • processing module 701 is specifically used for:
  • the non-access stratum determines that the terminal device is located in the applicable area of the second cell reselection mode indicated by the second indication information in the first information, the non-access stratum sends the information to the The access stratum sends the RA.
  • processing module 701 is specifically used for:
  • the non-access stratum determines a first result according to the TAI in the system message of the searched cell and the first information, where the first result is used to indicate whether the searched cell is in the terminal within the RA of the device;
  • the cell reselection mode is determined at the access layer according to the first result.
  • processing module 701 is specifically used for:
  • the TAI in the system message of the searched cell determines the first result.
  • the first information is carried in a NAS message.
  • the first information is carried in a network slice registration accept (Registration Accept) message.
  • processing module 701 is specifically used for:
  • the access layer determines to use the first cell reselection mode
  • the access layer determines to use the second cell reselection mode.
  • the terminal device provided in the embodiment of the present application is configured to execute the technical solution executed by the terminal device in any of the foregoing method embodiments, and the implementation principle and technical effect thereof are similar, and details are not described herein again.
  • FIG. 12 is a schematic structural diagram of a network device provided by an embodiment of the present application.
  • the network device 800 provided by this embodiment of the present application includes: a processing module 801 and a sending module 802 .
  • a processing module 801 configured to determine first information, where the first information includes at least first indication information, and the first indication information is used to indicate a cell reselection mode used by the terminal device;
  • the sending module 802 is configured to send the first information to the terminal device.
  • the cell reselection mode used by the terminal equipment indicated by the first indication information includes: at least one of a first cell reselection mode and a second cell reselection mode;
  • the first cell reselection manner is to perform cell reselection based on the signal quality of the cell
  • the second cell reselection manner is to perform cell reselection based on the network slice of the cell and the signal quality.
  • the first information further includes: second indication information, where the second indication information is used to indicate an applicable area of the cell reselection mode.
  • the first information further includes: a registration area RA of the terminal device.
  • processing module 801 is specifically used for:
  • the first information is determined according to the location of the terminal device and/or the subscription information of the terminal device.
  • the first information is carried in a NAS message.
  • the first information is carried in a network slice registration accept (Registration Accept) message.
  • the network device provided in this embodiment of the present application is configured to execute the technical solution executed by the network device in the embodiment shown in FIG. 8 , and its implementation principle and technical effect are similar, and details are not repeated here.
  • each module of the terminal device or network device is only a division of logical functions, and may be fully or partially integrated into one physical entity or physically separated in actual implementation.
  • these modules can all be implemented in the form of software calling through processing elements; they can also all be implemented in hardware; some modules can also be implemented in the form of calling software through processing elements, and some modules can be implemented in hardware.
  • the processing module may be a separately established processing element, or may be integrated into a certain chip of the above-mentioned device to be implemented, in addition, it may also be stored in the memory of the above-mentioned device in the form of program code, and a certain processing element of the above-mentioned device Call and execute the function of the above determined module.
  • each step of the above-mentioned method or each of the above-mentioned modules can be completed by an integrated logic circuit of hardware in the processor element or an instruction in the form of software.
  • the above modules may be one or more integrated circuits configured to implement the above methods, such as: one or more application specific integrated circuits (ASIC), or one or more microprocessors (digital) signal processor, DSP), or, one or more field programmable gate arrays (field programmable gate array, FPGA), etc.
  • ASIC application specific integrated circuits
  • DSP digital signal processor
  • FPGA field programmable gate array
  • the processing element may be a general-purpose processor, such as a central processing unit (central processing unit, CPU) or other processors that can call program codes.
  • these modules can be integrated together and implemented in the form of a system-on-a-chip (SOC).
  • SOC system-on-a-chip
  • the above-mentioned embodiments it may be implemented in whole or in part by software, hardware, firmware or any combination thereof.
  • software it can 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. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated.
  • the computer may be a general purpose computer, special purpose computer, computer network, or other programmable device.
  • the computer instructions may be stored in or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server or data center Transmission to another website site, computer, server, or data center is by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.).
  • the computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, a data center, etc. that includes one or more available mediums integrated.
  • the usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, DVDs), or semiconductor media (eg, solid state disks (SSDs)), and the like.
  • FIG. 13 is a schematic diagram of a hardware structure of a terminal device provided by an embodiment of the present application.
  • the terminal device 900 in this embodiment may include: a processor 901 , a memory 902 and a communication interface 903 .
  • the memory 902 is used for storing computer programs; the processor 901 is used for executing the computer programs stored in the memory 902, so as to implement the method executed by the terminal device in any of the above method embodiments.
  • the communication interface 903 is used for data communication or signal communication with network devices or other devices.
  • the memory 902 may be independent or integrated with the processor 901 .
  • the terminal device 900 may further include: a bus 904 for connecting the memory 902 and the processor 901 .
  • the terminal device provided in this embodiment can be used to execute the method executed by the terminal device in any of the above method embodiments, and its implementation principle and technical effect are similar, and details are not repeated here.
  • FIG. 14 is a schematic structural diagram of a network device provided by an embodiment of the present application. As shown in FIG. 14 , the network device 1000 in this embodiment includes:
  • the memory 1002 is used for storing computer programs; the processor 1001 is used for executing the computer programs stored in the memory 1002 to implement the method executed by the network device in any of the above method embodiments.
  • the communication interface 1003 is used for data communication or signal communication with a terminal device or other devices.
  • the memory 1002 may be independent or integrated with the processor 1001 .
  • the network device 1000 may further include: a bus 1004 for connecting the memory 1002 and the processor 1001 .
  • the network device provided in this embodiment can be used to execute the method executed by the network device in the above-mentioned embodiment shown in FIG. 8 , and its implementation principle and technical effect are similar, and details are not repeated here.
  • Embodiments of the present application further provide a computer-readable storage medium, where computer-executable instructions are stored in the computer-readable storage medium, and when the computer-executable instructions are executed by a processor, are used to implement the terminal in any of the foregoing method embodiments The technical solution of the equipment.
  • Embodiments of the present application further provide a computer-readable storage medium, where computer-executable instructions are stored in the computer-readable storage medium, and when the computer-executable instructions are executed by a processor, are used to implement the network in any of the foregoing method embodiments The technical solution of the equipment.
  • the embodiments of the present application further provide a program, which, when the program is executed by the processor, is used to execute the technical solution of the terminal device in any of the foregoing method embodiments.
  • the embodiments of the present application further provide a program, which, when the program is executed by the processor, is used to execute the technical solution of the network device in any of the foregoing method embodiments.
  • Embodiments of the present application further provide a computer program product, including program instructions, where the program instructions are used to implement the technical solution of the terminal device in any of the foregoing method embodiments.
  • Embodiments of the present application further provide a computer program product, including program instructions, where the program instructions are used to implement the technical solution of the network device in any of the foregoing method embodiments.
  • Embodiments of the present application further provide a chip, including: a processing module and a communication interface, where the processing module can execute the technical solutions of the terminal device in the foregoing method embodiments.
  • the chip also includes a storage module (such as a memory), the storage module is used for storing instructions, the processing module is used for executing the instructions stored in the storage module, and the execution of the instructions stored in the storage module causes the processing module to execute the execution of the terminal device.
  • a storage module such as a memory
  • Embodiments of the present application further provide a chip, including: a processing module and a communication interface, where the processing module can execute the technical solutions of the network device in the foregoing method embodiments.
  • the chip also includes a storage module (eg, memory), the storage module is used for storing instructions, the processing module is used for executing the instructions stored in the storage module, and the execution of the instructions stored in the storage module causes the processing module to execute the network device.
  • a storage module eg, memory
  • the storage module is used for storing instructions
  • the processing module is used for executing the instructions stored in the storage module
  • the execution of the instructions stored in the storage module causes the processing module to execute the network device.
  • At least two means two or more, and "a plurality” means two or more.
  • “And/or”, which describes the association relationship of the associated objects, indicates that there can be three kinds of relationships, for example, A and/or B, which can indicate: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A, B can be singular or plural.
  • the character “/” generally indicates that the related objects before and after are an “or” relationship; in the formula, the character “/” indicates that the related objects are a “division” relationship.
  • “At least one item(s) below” or similar expressions thereof refer to any combination of these items, including any combination of single item(s) or plural items(s).
  • At least one item (a) of a, b, or c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c can be single or multiple indivual.

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Abstract

La présente demande concerne un procédé de resélection de cellules, un dispositif et un support de stockage. Le procédé comprend les étapes suivantes : un dispositif terminal détermine un mode de resélection de cellule selon que le dispositif terminal est actuellement en dehors d'une zone de recalage (RA) du dispositif terminal ; si le dispositif terminal est sur le point de quitter ou a quitté la RA, le dispositif terminal doit resélectionner une cellule sur la base d'une tranche de réseau de la cellule et de la qualité du signal ; et si le dispositif terminal se trouve à l'intérieur de la RA, le dispositif terminal a seulement besoin de resélectionner une cellule sur la base de la qualité de signal de la cellule. Au moyen du procédé décrit, le dispositif terminal considère des tranches de réseau prises en charge par des cellules environnantes pendant une resélection de cellule uniquement lorsque celle-ci est sur le point de quitter ou a quitté la RA, ce qui permet de réduire la complexité de changement de cellules dans la RA et de réduire la consommation d'énergie du dispositif terminal.
PCT/CN2021/083834 2021-03-30 2021-03-30 Procédé de resélection de cellule, dispositif et support de stockage WO2022204914A1 (fr)

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PCT/CN2021/083834 WO2022204914A1 (fr) 2021-03-30 2021-03-30 Procédé de resélection de cellule, dispositif et support de stockage
CN202180078569.8A CN116491163A (zh) 2021-03-30 2021-03-30 小区重选方法、设备及存储介质

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Citations (4)

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US20150264618A1 (en) * 2012-11-03 2015-09-17 Lg Electronics Inc. Interested service-based cell reselection method in wireless communication system, and apparatus for supporting same
CN111615160A (zh) * 2019-06-21 2020-09-01 维沃移动通信有限公司 一种小区重选方法及终端设备
CN112042225A (zh) * 2020-07-28 2020-12-04 北京小米移动软件有限公司 一种小区重选方法、小区重选装置及存储介质
CN112449387A (zh) * 2019-09-04 2021-03-05 中国移动通信有限公司研究院 一种通信方法、终端及基站

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Publication number Priority date Publication date Assignee Title
US20150264618A1 (en) * 2012-11-03 2015-09-17 Lg Electronics Inc. Interested service-based cell reselection method in wireless communication system, and apparatus for supporting same
CN111615160A (zh) * 2019-06-21 2020-09-01 维沃移动通信有限公司 一种小区重选方法及终端设备
CN112449387A (zh) * 2019-09-04 2021-03-05 中国移动通信有限公司研究院 一种通信方法、终端及基站
CN112042225A (zh) * 2020-07-28 2020-12-04 北京小米移动软件有限公司 一种小区重选方法、小区重选装置及存储介质

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