WO2022027187A1 - Procédé et appareil de sélection de réseaux mobiles terrestres publics - Google Patents

Procédé et appareil de sélection de réseaux mobiles terrestres publics Download PDF

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Publication number
WO2022027187A1
WO2022027187A1 PCT/CN2020/106609 CN2020106609W WO2022027187A1 WO 2022027187 A1 WO2022027187 A1 WO 2022027187A1 CN 2020106609 W CN2020106609 W CN 2020106609W WO 2022027187 A1 WO2022027187 A1 WO 2022027187A1
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WIPO (PCT)
Prior art keywords
country
plmn
terminal device
candidate
cell
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PCT/CN2020/106609
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English (en)
Chinese (zh)
Inventor
吴烨丹
耿婷婷
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华为技术有限公司
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Priority to PCT/CN2020/106609 priority Critical patent/WO2022027187A1/fr
Priority to CN202080104566.2A priority patent/CN116250288A/zh
Publication of WO2022027187A1 publication Critical patent/WO2022027187A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service

Definitions

  • the present application relates to the field of communication technologies, and in particular, to a method and apparatus for selecting a public land mobile network.
  • a public land mobile network is a network established and operated by the government or its approved operators for the purpose of providing land mobile communication services to the public.
  • User equipment UE needs to meet national security regulations and regulatory requirements when selecting a PLMN, that is, the UE can only access the PLMN of the country where it is located. For example, when the UE is in country A, it can only access the PLMN of country A. , when in country B, you can only access the PLMN of country B.
  • NTN non-terrestrial network
  • PLMN ID PLMN identification
  • the present application provides a PLMN selection method and apparatus to solve the problem that in NTN, the PLMN selected by the terminal equipment may not be the PLMN of the country where it is located, so that it is difficult to communicate normally.
  • the present application provides a PLMN selection method, and the method can be applied to a terminal device, or a chip, or a chipset, or a functional module in the chip that executes the method, and so on.
  • the method includes: the terminal device determines a candidate PLMN identifier, the candidate PLMN corresponding to the candidate PLMN identifier corresponds to an access requirement, and the access requirement is to allow the terminal device located in the country corresponding to the candidate PLMN to access; the terminal device Determine the country where the terminal device is currently located; when the terminal device is currently located in the same country as the country corresponding to the candidate PLMN, the terminal device determines to select the candidate PLMN for access.
  • the UE when selecting a PLMN, the UE first determines whether the selected PLMN is the PLMN of the current country, so that the UE can communicate normally under the supervision of the current country. It can also ensure the security and credibility of satellite communications and prevent the breeding of criminal activities.
  • the candidate PLMN identifier is associated with indication information, and the indication information is used to indicate that the terminal equipment needs to select the PLMN of the country where it is located. logo.
  • the terminal equipment is instructed by the indication information to first determine whether the selected PLMN is the PLMN of the country where it is currently located when selecting a PLMN.
  • the indication information may be associated with a PLMN identity, and the PLMN identity is a candidate PLMN identity.
  • the granularity of the indication information is smaller, so that the flexibility is higher.
  • the indication information may also be associated with a PLMN identity group, the PLMN identity group includes at least one PLMN identity, and the at least one PLMN identity includes candidate PLMN identity.
  • the granularity of the indication information is small, thereby saving signaling overhead while improving flexibility.
  • the indication information may also be associated with a cell, and the PLMN identity of the cell includes the candidate PLMN identity.
  • the granularity of the indication information is small, thereby saving signaling overhead while improving flexibility.
  • the indication information may also be associated with a cell group, the cell group includes at least one cell, and the PLMN identifier of the at least one cell includes the candidate PLMN identifier.
  • the granularity of the indication information is relatively large, so that signaling overhead can be saved.
  • the indication information is associated with a frequency point
  • a frequency point includes at least one cell that transmits signals using the frequency point
  • the PLMN identity of the at least one cell includes a candidate PLMN identity.
  • the granularity of the indication information is relatively large, so that signaling overhead can be saved.
  • the terminal device may receive the candidate PLMN identifier sent by the access network, where the candidate PLMN identifier carries indication information.
  • the candidate PLMN identification carries the indication information, so that the terminal equipment can judge whether the current country is consistent with the country corresponding to the candidate PLMN identification when selecting the candidate PLMN identification, so that the terminal equipment can be under the supervision of the current country. normal communication.
  • the terminal device when the terminal device determines the country where the terminal device is currently located, it may receive country information sent by the access network device, where the country information indicates the geographic location range of the corresponding country, or the country information indicates the corresponding country the borders of the country.
  • the terminal device acquires the current location of the terminal device, and determines the country where the terminal device is currently located according to the country information and the location.
  • the terminal device with the positioning function can determine the country where it is located according to the country information broadcast by the access network device and the positioning result.
  • the terminal device determines the country where the terminal device is currently located according to the country information and the location, if the location is within the geographic location range of the corresponding country indicated by the country information, it can be determined that the terminal device is currently located in country is the corresponding country.
  • the terminal device determines the country where the terminal device is currently located according to the country information and the location, if the location is not within the geographic location range of the corresponding country indicated by the country information, and the location corresponds to the country indicated by the country information. If the distance between the national borders of the countries is less than the distance threshold, it can be determined that the country where the terminal device is currently located is the corresponding country. In the above manner, by allowing a certain range of terminal equipment near the national border to access, the situation of inaccessibility of the terminal equipment due to positioning errors can be avoided, thereby ensuring the access efficiency of the terminal equipment and improving the user experience.
  • the terminal device when the terminal device determines the country where the terminal device is currently located, it can receive N PLMN identifiers sent by the access network device, wherein one PLMN identifier corresponds to one country; the terminal device determines the current location of the terminal device.
  • the country of is the first country, and among the N PLMN identities, the number of PLMN identities corresponding to the first country is the largest.
  • the above design for terminal equipment without positioning capability, can use the searched ground network to determine the country where it is located, and use it for PLMN selection, so that terminal equipment without positioning capability can also be used in PLMN selection, cell selection and reselection. Carrying out normal communications under the supervision of the country where it is currently located can also ensure the security and credibility of satellite communications and prevent the breeding of criminal activities.
  • the terminal device may also select the first cell to camp on, wherein the country corresponding to at least one PLMN identity of the multiple PLMN identities corresponding to the first cell is the same as the country corresponding to the candidate PLMN identity.
  • an embodiment of the present application provides a communication apparatus, and the apparatus may be a terminal device, or a chip or a module in the terminal device.
  • the apparatus may include a processing unit, a transceiving unit and a receiving unit. It should be understood that, the sending unit and the receiving unit may also be combined and referred to as a transceiver unit.
  • the processing unit may be a processor, and the transmitting unit and the receiving unit may be transceivers;
  • the communication device may further include a storage unit, which may be a memory; the storage unit is used for storing instructions , the processing unit executes the instructions stored in the storage unit, so that the terminal device executes the method in the first aspect or any possible design of the first aspect.
  • the processing unit may be a processor, and the sending unit and the receiving unit may be input/output interfaces, pins or circuits, etc.; the processing unit executes the instructions stored in the storage unit to The chip is caused to perform the method of the first aspect or any possible design of the first aspect.
  • the storage unit is used to store instructions, and the storage unit may be a storage unit in the chip (for example, a register, a cache, etc.), or a storage unit in the terminal device located outside the chip (for example, a read-only memory, random access memory, etc.).
  • an embodiment of the present application further provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program runs on a computer, the computer executes the method described in the first aspect above. .
  • the embodiments of the present application further provide a computer program product including a computer program, which, when run on a computer, enables the computer to execute the method described in the first aspect.
  • a communication apparatus including: a processor, a communication interface and a memory.
  • the communication interface is used to transfer information, and/or messages, and/or data between the device and other devices.
  • the memory is used to store computer-executable instructions, and when the apparatus is running, the processor executes the computer-executable instructions stored in the memory to cause the apparatus to perform the method described in the first aspect and any possible designs thereof.
  • an embodiment of the present application provides a chip, which is coupled to a memory, and performs the method described in the first aspect and any possible designs thereof. It should be noted that, “coupled” in the embodiments of the present application means that two components are directly or indirectly combined with each other.
  • an embodiment of the present application provides a chip, including a communication interface and at least one processor, wherein the processor obtains computer program instructions through the communication interface and runs them to execute the above-mentioned first aspect and any possible design thereof.
  • FIG. 1 is a schematic diagram of a protocol stack provided by an embodiment of the present application.
  • FIG. 2A is a schematic diagram of a satellite provided by an embodiment of the present application.
  • FIG. 2B is a schematic diagram of another satellite provided by an embodiment of the present application.
  • 2C is a schematic diagram of an RRC state transition provided by an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of an access network device according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of an NTN application scenario provided by an embodiment of the present application.
  • FIG. 5 is a schematic diagram of another NTN application scenario provided by an embodiment of the present application.
  • FIG. 6 is a schematic diagram of another NTN application scenario provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of an interface provided by an embodiment of the present application.
  • FIG. 8 is a schematic diagram of another NTN application scenario provided by an embodiment of the present application.
  • FIG. 9A is a schematic diagram of another NTN application scenario provided by an embodiment of the present application.
  • 9B is a schematic diagram of a satellite sharing scenario provided by an embodiment of the present application.
  • FIG. 10 is a schematic flowchart of a PLMN selection method provided by an embodiment of the present application.
  • FIG. 11 is a schematic diagram of a process for selecting a PLMN for a terminal device according to an embodiment of the present application
  • FIG. 12 is a schematic diagram of another terminal equipment selection PLMN process provided by an embodiment of the application.
  • FIG. 13 is a schematic structural diagram of a communication device according to an embodiment of the present application.
  • FIG. 14 is a schematic structural diagram of a communication apparatus according to an embodiment of the present application.
  • Non-access stratum and access stratum (access stratum, AS)
  • NAS is a signaling channel between the UE and the AMF.
  • the specific process may be that the UE sends a NAS message to the base station, the base station transparently transmits the NAS message to the AMF, and the base station does not parse the NAS message during the transparent transmission process.
  • NAS is mainly responsible for some management functions, such as PLMN selection, manual selection, access control, registration, subscription information, etc.
  • the specific process can be coordinated with other protocol layers (such as AS).
  • AS refers to a protocol layer other than the NAS layer, which can include radio resource control (RRC), packet data convergence protocol (PDCP), radio link control (radio link control, RLC), Medium access control (MAC), physical layer (PHY), AS is mainly responsible for switching, encryption, data retransmission, sorting, sending and other functions.
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MAC Medium access control
  • PHY physical layer
  • AS is mainly responsible for switching, encryption, data retransmission, sorting, sending and other functions.
  • PLMN is generally used to provide network services for terminal equipment in daily life.
  • PLMN is a network established and operated by the government or its approved operators for the purpose of providing land mobile communication services to the public.
  • Different PLMN networks can be distinguished by different PLMN identifications (IDs).
  • IDs PLMN identifications
  • the PLMN identity is composed of a mobile country code (mobile contrary code, MCC) and a mobile network number (mobile net code, MNC).
  • MCC mobile country code
  • MNC mobile network number
  • MNC mobile network number
  • MCC mobile country code
  • MNC mobile network number
  • MNC mobile network number
  • PLMN selection can be as follows:
  • the AS of the UE scans the radio frequency (RF) channels (channels) of all NR frequency bands (bands) according to its own capability to find available PLMNs.
  • the UE will find the cell with the best RSRP in each frequency point and then read the system information block 1 (SIB1) of the cell to obtain the PLMN ID.
  • SIB1 system information block 1
  • the AS of the UE reports a PLMN list (list) to the NAS of the UE, and the PLMN list includes the PLMN ID obtained by the AS of the UE.
  • the NAS of the UE after receiving the PLMN list reported by the AS of the UE, the NAS of the UE will select one of the PLMN IDs as the PLMN used by the UE.
  • the searched PLMN can be: registered PLMN (registered PLMN, RPLMN), RPLMN is the PLMN registered before the UE shuts down or disconnects from the network; equivalent PLMN (equivalent PLMN, EPLMN), EPLMN is the current selection of the UE
  • the PLMN with the same priority of the PLMN the home PLMN (home PLMN, HPLMN), the identity of the HPLMN is stored in the subscriber identity module (SIM) card of the mobile phone, and each SIM card has only one HPLMN, which is burned in when it leaves the factory.
  • Equivalent HPLMN equivalent HPLMN, EHPLMN
  • the NAS of the UE can provide the AS of the UE with the EPLMN list and forbidden tracking area (forbidden tracking area, forbidden TA) according to the selected PLMN ID, and the AS of the UE can be forbidden according to the EPLMN list and the forbidden tracking area (forbidden tracking area, forbidden TA).
  • the TA performs cell selection and reselection.
  • the UE When the UE is powered on or a radio link failure occurs, after completing the PLMN selection, the UE will perform a cell search process and select a suitable cell to camp on as soon as possible. This process is called "cell selection”.
  • the cell where the UE may reside is called a suitable cell, and a suitable cell needs to meet the following conditions:
  • the PLMN ID of the cell belongs to one of the selected PLMN, RPLMN, and EPLMN.
  • the cell needs to meet the S criterion, that is, if the S value of the cell is greater than 0, it means that the cell is a suitable cell (a cell suitable for camping), and S is the level value calculated during the cell selection/reselection process. .
  • Condition 3 The cell does not prohibit UE access.
  • Condition 4 Under the premise that the PLMN ID of the cell satisfies Condition 1, at least one TA is not in the banned TA.
  • a UE in an idle (IDLE) state When a UE in an idle (IDLE) state camps on a cell, as the UE moves, the UE may need to switch to another cell with a higher priority or better signal to camp on, which is the cell reselection process.
  • Cell selection is the process of finding a suitable cell as soon as possible, and cell reselection is the process of selecting a more suitable cell.
  • the UE will measure the neighboring cells according to the frequency and priority in the RRC release message and the broadcast message of the camped cell, and perform cell reselection according to the measurement result.
  • NTN communication may also be referred to as satellite communication.
  • the architecture of satellite communication is divided into two categories, one is the transparent forwarding (transparent) architecture, at this time the satellite only acts as a relay or amplifier, and can do radio frequency filtering, amplification, etc., to regenerate the signal; the second is regenerative (regenerative) architecture.
  • ) architecture at this time the satellite can be a new generation of node B (generated node B, gNB), distributed unit (distributed unit, DU), relay, the relay here is different from the relay in the first category, and it is no longer a simple relay, which also has a signal processing function, is similar to an integrated access and backhaul (IAB) node or other relay nodes.
  • IAB integrated access and backhaul
  • NTN communication provides seamless coverage for terminal equipment by deploying the functions of access network equipment or part of the access network equipment on non-terrestrial equipment (such as high-altitude platforms or satellites, etc.), because non-terrestrial equipment is less affected by natural disasters , which can improve the reliability of the communication system.
  • the present application will take the NTN communication system in which the access network equipment is deployed on the satellite as an example for description later in the present application.
  • this application will hereinafter replace the description of "access network equipment on a satellite” with "satellite”, and replace the description of "NTN communication" with "satellite communication”. That is, the communication between the terminal device and the satellite referred to later in this application actually refers to the communication between the terminal device and the access network device on the satellite.
  • a unified description which will not be repeated later.
  • the satellite system can be divided into highly elliptical orbiting (HEO) satellites, geostationary earth orbit (GEO) satellites, medium earth orbit (MEO) satellites and Low-earth orbit (LEO) satellites, as shown in Figure 2A or Figure 2B.
  • the NTN system may also include aerial network equipment such as a high altitude platform station (HAPS) communication system, and the network equipment involved in the present invention is not limited to the above examples.
  • HAPS high altitude platform station
  • the RRC state of the UE includes RRC_CONNECTED (connected state), RRC_INACTIVE (deactivated state or third state), and RRC_IDLE (idle state).
  • RRC_CONNECTED connected state
  • RRC_INACTIVE deactivated state or third state
  • RRC_IDLE expired state
  • the UE has established links with the base station and the core network.
  • data arrives at the network it can be directly transmitted to the UE;
  • the UE when the UE is in the RRC_INACTIVE state, it means that the UE has established a link with the base station and the core network before, but the link from the UE to the base station is released, although the link is released
  • the base station will store the context of the UE.
  • the base station can quickly restore this link; when the UE is in the RRC_IDLE state, there is no link between the UE and the base station and the network.
  • the link from the UE to the base station and the core network needs to be established.
  • the transitions of the three states are shown in Figure 2C.
  • the network elements involved in the embodiments of this application include network equipment and terminal equipment.
  • the network device may be an access network device.
  • An access network device is an entity on the network side for transmitting or receiving signals, such as a new generation base station (generation Node B, gNodeB).
  • An access network device may be a device used to communicate with a mobile device.
  • the access network device may be an access point (AP) in a wireless local area network (wireless local area networks, WLAN), or an evolved base station (evolutional Node B, eNB) in long term evolution (long term evolution, LTE).
  • AP access point
  • WLAN wireless local area networks
  • eNB evolved base station
  • long term evolution long term evolution
  • an access network device provides services for a cell, and a terminal device communicates with the access network device through transmission resources (eg, frequency domain resources, or spectrum resources) used by the cell.
  • the access network device in this embodiment of the present application may refer to a central unit (central unit, CU) or a DU.
  • the access network device may also be composed of CU and DU, for example, as shown in FIG. 3 .
  • the CU and the DU may be physically separated, or may be deployed together, which is not specifically limited in this embodiment of the present application.
  • One CU can be connected to one DU, or multiple DUs can share one CU, which can save costs and facilitate network expansion.
  • the segmentation of CU and DU can be divided according to the protocol stack, one of the possible ways is to aggregate the radio resource control (radio resource control, RRC), service data adaptation protocol (service data adaptation protocol, SDAP) and packet data.
  • RRC radio resource control
  • SDAP service data adaptation protocol
  • the protocol (packet data convergence protocol, PDCP) layer is deployed in the CU, and the rest of the radio link control (radio link control, RLC) layer, media access control (media access control, MAC) layer and physical layer are deployed in the DU.
  • the present invention does not completely limit the foregoing protocol stack segmentation mode, and other segmentation modes are also possible.
  • the CU and DU are connected through the F1 interface.
  • CU represents the gNB is connected to the core network through the Ng interface.
  • the access network device in this embodiment of the present application may refer to a centralized unit control plane (CU-CP) node or a centralized unit user plane (CU-UP) node, or the network device may also be a CU-CP and a CU- UP.
  • the CU-CP is responsible for the control plane function, mainly including RRC and PDCP-C.
  • PDCP-C is mainly responsible for encryption and decryption of control plane data, integrity protection, and data transmission.
  • CU-UP is responsible for user plane functions, mainly including SDAP and PDCP-U.
  • the SDAP is mainly responsible for processing the data of the core network and mapping the flow to the bearer.
  • PDCP-U is mainly responsible for data plane encryption and decryption, integrity protection, header compression, serial number maintenance, data transmission, etc.
  • the CU-CP and CU-UP are connected through the E1 interface.
  • CU-CP represents that the gNB is connected to the core network through the Ng interface. Connect via F1-C (control plane) and DU.
  • CU-UP is connected through F1-U (user plane) and DU.
  • PDCP-C is also in CU-UP.
  • the access network device mentioned in the embodiments of this application may be a device including a CU, or a DU, or a device including a CU and a DU, or a control plane CU node (CU-CP node) and a user plane CU node (CU-UP node) And the equipment of the DU node.
  • the access network equipment may be other apparatuses that provide wireless communication functions for the terminal equipment.
  • the embodiments of the present application do not limit the specific technology and specific device form adopted by the access network device.
  • a device that provides a wireless communication function for a terminal device is referred to as an access network device.
  • the terminal device may be a wireless terminal device capable of receiving access network device scheduling and indication information.
  • the wireless terminal device may be a device that provides voice and/or data connectivity to users, or a handheld device with wireless connection function, or a Other processing equipment for wireless modems.
  • a wireless end device may communicate with one or more core networks or the Internet via a radio access network (eg, radio access network, RAN), and the wireless end device may be a mobile end device, such as a mobile phone (or "cellular" phone) , mobile phone (mobile phone), computer and data card, for example, may be portable, pocket, hand-held, computer built-in or vehicle mounted mobile devices that exchange language and/or data with the radio access network.
  • Wireless terminal equipment may also be referred to as a system, a subscriber unit, a subscriber station, a mobile station, a mobile station (MS), a remote station, an access point ( access point (AP), remote terminal (remote terminal), access terminal (access terminal), user terminal (user terminal), user agent (user agent), subscriber station (SS), user terminal equipment (customer premises equipment, CPE), terminal (terminal), user equipment (user equipment, UE), mobile terminal (mobile terminal, MT), etc.
  • PCS personal communications service
  • SIP Session Initiation Protocol
  • WLL wireless local loop
  • PDAs personal digital assistants
  • Wi-Pad tablet Computer
  • Wireless terminal equipment may also be referred to as a system, a subscriber unit, a subscriber station, a mobile station, a mobile station (MS), a remote station, an access point ( access point (AP), remote terminal (remote terminal), access terminal (access terminal), user terminal (user terminal), user agent (user agent), subscriber station (SS), user terminal equipment (custom
  • the wireless terminal device can also be a wearable device and a next-generation communication system, for example, a terminal device in a 5G network or a terminal device in a future evolved PLMN network, a terminal device in an NR communication system, and the like.
  • a next-generation communication system for example, a terminal device in a 5G network or a terminal device in a future evolved PLMN network, a terminal device in an NR communication system, and the like.
  • the embodiments of the present application may also be applicable to other future-oriented communication technologies.
  • the network architecture and service scenarios described in this application are for the purpose of illustrating the technical solutions of this application more clearly, and do not constitute a limitation on the technical solutions provided by this application. appears, the technical solutions provided in this application are also applicable to similar technical problems.
  • the communication system may be: a fifth generation (The 5th Generation, 5G) communication system, an LTE communication system, and the like.
  • 5G Fifth Generation
  • LTE Long Term Evolution
  • the embodiments of the present application can be applied to the fourth generation (4G) system, 5G system, NTN system, vehicle to everything (V2X), long-term evolution-vehicle (LTE-vehicle, LTE) system -V), Vehicle to Vehicle (V2V), Internet of Vehicles, Machine Type Communications (MTC), Internet of Things (IoT), Long Term Evolution-Machine to Machine (LTE-machine to) machine, LTE-M), machine to machine (M2M), Internet of Things, or future mobile communication systems.
  • 4G fourth generation
  • 5G system NTN system
  • V2X vehicle to everything
  • LTE-vehicle long-term evolution-vehicle
  • LTE-vehicle Long-term evolution-vehicle
  • LTE Long-term evolution-vehicle
  • LTE Long-term evolution-vehicle
  • LTE Long-term evolution-vehicle
  • LTE Long-term evolution-vehicle
  • LTE Long-term evolution-vehi
  • the satellite may act as a base station to establish an N2 or Ng connection with an AMF entity in the core network to provide wireless access services for terminal equipment.
  • an X2 or Xn connection may be established between two base stations in the RAN to transmit data such as cell information, thereby realizing cell reselection and handover of the terminal device.
  • two base stations that establish a connection in the RAN can be: a satellite serving as a base station and a satellite serving as a base station, a satellite serving as a base station and a traditional base station, a base station composed of multiple partial functions and a traditional base station, or a multi-function base station. Between a base station composed of a partial function and a satellite serving as a base station, etc.
  • a connection can be established between two satellites serving as base stations for data and signaling interaction.
  • dual-connectivity (DC) technology can be used to provide users with higher rates and improve spectral efficiency.
  • Terminal equipment can connect to two base stations at the same time to increase the throughput of a single user.
  • a connection needs to be established between two base stations to which the terminal device is connected at the same time through a corresponding interface for data and signaling interaction, as shown in FIG. 6 .
  • one of the two base stations connected to the terminal device at the same time serves as the primary base station, and the other serves as the secondary base station.
  • the interface between the AMF entity and the base station and the interface between the two base stations will also change accordingly, as shown in the schematic diagram of each interface in FIG. 7 .
  • the satellite can also be used as a relay device between the terminal device and the base station or as a remote radio unit (remote radio unit, RRU) of the base station.
  • RRU remote radio unit
  • the satellite is mainly responsible for L1 relay, which is used for physical layer forwarding, and the upper layers are not visible.
  • the base station in the RAN is split into two functional parts, DU and CU, in which satellites can be used as DUs.
  • the interface between the DU and the CU is the F1 interface.
  • the selected PLMN ID mainly meets the following conditions: the PLMN corresponding to the PLMN ID is RPLMN or EPLMN or HPLMN or EHPLMN.
  • the selected cell mainly meets the following conditions: at least one PLMN ID corresponding to the PLMN ID of the cell is RPLMN or EPLMN or HPLMN or EHPLMN.
  • the UE In terrestrial communication, during the RRC setup or RRC recovery process, the UE will carry the PLMN ID selected by the UE in the RRC setup complete message or RRC recovery complete message. As long as the PLMN ID selected by the UE meets the above conditions, the network allows the UE to access .
  • the communication range covered by satellites is very large.
  • GEO satellites the area of one beam can reach hundreds of kilometers.
  • a satellite can be shared and used by the core networks of multiple countries, for example, as shown in Figure 9B, a satellite cell will broadcast the core network PLMN IDs of multiple countries, causing the UE to perform PLMN selection and cell selection/reselection. During the process, it is likely to choose a PLMN that is not the country where it is located, so it is difficult to communicate normally.
  • the embodiments of the present application provide a PLMN selection method and apparatus to solve the problem that in NTN, the PLMN selected by the terminal equipment may not be the PLMN of the country where it is located, so that normal communication is difficult.
  • the method and the device are based on the same inventive concept. Since the principles of the method and the device for solving the problem are similar, the implementation of the device and the method can be referred to each other, and the repetition will not be repeated.
  • At least one refers to one or more, and "a plurality” refers to two or more.
  • And/or which describes the association relationship of the associated objects, means that there can be three kinds of relationships, for example, A and/or B, it can mean that A exists alone, A and B exist at the same time, and B exists alone, where A, B can be singular or plural.
  • the character “/” generally indicates that the associated objects are an “or” relationship.
  • At least one (item) of the following or its similar expression refers to any combination of these items, including any combination of single item (item) or plural item (item).
  • At least one (a) of a, b or c may represent: a, b, c, a and b, a and c, b and c, or a, b and c, where a, b, c Can be single or multiple.
  • a PLMN selection method is provided in this embodiment of the present application.
  • the method can be applied to a terminal device, or a chip, or a chipset, or a functional module in the chip that executes the method, and so on.
  • the PLMN selection can specifically include:
  • a terminal device determines a candidate PLMN identifier, the candidate PLMN corresponding to the candidate PLMN identifier corresponds to an access requirement, and the access requirement is to allow terminal devices located in a country corresponding to the candidate PLMN to access.
  • the candidate PLMN satisfies the following conditions, it can be determined that the candidate PLMN has access requirements: the candidate PLMN identifier is associated with indication information, and the indication information is used to indicate that the terminal device needs to select the PLMN identifier of the country where it is located.
  • the terminal device may determine whether the candidate PLMN corresponds to the access requirement according to whether the candidate PLMN identifier is associated with the indication information.
  • the granularity of the indication information may be valid for a single PLMN ID, that is, one indication information is associated with one PLMN ID.
  • Each PLMN ID can carry indication information, that is, the maximum number of indication information is the same as the number of PLMN IDs.
  • the PLMN ID of cell 1 includes PLMN 1, PLMN 2 (carrying indication information), and PLMN 3, wherein PLMN 2 is associated with the indication information, so the terminal device determines that PLMN 2 corresponds to an access requirement. To select PLMN 2, then It is necessary to judge whether the country where the terminal device is currently located is consistent with the country corresponding to PLMN 2.
  • the granularity of the indication information may be valid for multiple PLMN IDs, that is, one indication information is associated with multiple PLMN IDs.
  • the PLMN ID of cell 1 includes PLMN 1, PLMN 2, and PLMN 3, wherein, if the indication information is valid for PLMN 1 and PLMN 2, then PLMN 1 and PLMN 2 are associated with the indication information.
  • the granularity of the indication information may be valid for one cell, that is, one indication information is associated with one cell, and the PLMN ID of the cell is associated with the indication.
  • Each cell can carry indication information, that is, the maximum number of indication information appearing is the same as the number of cells.
  • the indication information is valid for cell 1, and the PLMN ID of cell 1 includes PLMN 1, PLMN 2, and PLMN 3, wherein PLMN 1, PLMN 2, and PLMN 3 are associated with the indication information.
  • the granularity of the indication information may be valid for multiple cells, that is, one indication information is associated with multiple cells, that is, one indication information is associated with multiple cells, and the PLMN IDs of the multiple cells are all associated with the indication.
  • the granularity of the indication information may be valid for all PLMN IDs.
  • the access network device carries an indication information in the system message, and the indication information is valid for the PLMN ID broadcast by the access network device, that is, the PLMN ID broadcast by the access network device is associated with the indication information.
  • the granularity of the indication information may be valid for one frequency point, that is, the indication information is associated with a frequency point, and a frequency point includes at least one cell that transmits signals using this frequency point, so the indication information is not effective for transmitting signals using this frequency point.
  • the PLMN IDs of the cells in the frequency point are all valid, and it can also be understood that the PLMN IDs of the cells that use this frequency to transmit signals are associated with the indication information.
  • the terminal device When the terminal device selects the PLMN ID associated with the indication information, it needs to determine whether the country where the terminal device is located is consistent with the country corresponding to the PLMN ID.
  • the terminal device can determine whether the candidate PLMN identity is associated with the indication information in the following manner: when the terminal device receives the candidate PLMN identity sent by the access network, if the candidate PLMN identity carries the indication information, the candidate PLMN identity is associated with the indication information. Indicates information association. If the candidate PLMN identifier does not carry the indication information, the candidate PLMN identifier is not associated with the indication information.
  • the terminal device when the terminal device receives the candidate PLMN identifier sent by the access network, if the indicator bit carried by the candidate PLMN identifier takes the value of the first value (for example, 1), the candidate PLMN identifier is associated with the indicator information. If the indicator bit carried by the candidate PLMN identifier takes the value of the second value (for example, 0), the candidate PLMN identifier is not associated with the indicator information.
  • the first value for example, 1
  • the candidate PLMN identifier is associated with the indicator information.
  • the indicator bit carried by the candidate PLMN identifier takes the value of the second value (for example, 0)
  • the candidate PLMN identifier is not associated with the indicator information.
  • the access network device may be a satellite, for example, the access network device may be a satellite connected to the core network as an independent access network device. Alternatively, the access network device may also be a satellite connected to a ground base station as a relay device. Alternatively, the access network equipment may also be a satellite connected to a terrestrial CU as a DU, and so on.
  • the protocol may also specify that some candidate PLMN identities are associated with the indication information, so that when the terminal device selects these candidate PLMN identities, it needs to determine whether the country where the terminal device is located is consistent with the country corresponding to the PLMN ID. .
  • the terminal device determines the country where the terminal device is currently located.
  • the terminal device can determine the location of the terminal device through a global positioning system (GPS), and then can determine the country where the terminal device is located according to the country information sent by the access network device and the location of the terminal device. .
  • the country information indicates a geographic location range of a corresponding country, such as a latitude and longitude range, and so on.
  • the country information indicates the national border of the corresponding country.
  • the country information sent by the access network device is the longitude and latitude range of country A. If the longitude and latitude of the terminal device is within the longitude and latitude range of country A, the country where the terminal device is currently located is country A. If the longitude and latitude of the terminal device is outside the range of the longitude and latitude of country A, the country where the terminal device is currently located is another country.
  • the latitude and longitude of the terminal device if the latitude and longitude of the terminal device is outside the range of longitude and latitude of country A, but the distance between the location of the terminal device and the national border of country A is less than the distance threshold, it can also be considered that the country where the terminal device is currently located is country A. .
  • the situation of inaccessibility of the terminal equipment due to positioning errors can be avoided, thereby ensuring the access efficiency of the terminal equipment and improving the user experience.
  • the terminal device may also determine the country where the terminal device is currently located according to the PLMN identifier broadcast by the access network device. For example, when the terminal device receives N PLMN identities sent by the access network device, where one PLMN identity corresponds to one country, and the number of PLMN identities corresponding to the first country among the N PLMN identities is the largest, the terminal device can determine the current state of the terminal device. The country in which it is located is the first country.
  • the terminal device can judge the country where it is currently located according to other information. For example, the terminal device can determine the current country according to the previously stored location information and its own moving speed.
  • the terminal device determines to select the candidate PLMN for access when the country where the terminal device is currently located is consistent with the country corresponding to the candidate PLMN.
  • the terminal device may select a first cell to camp on, and the country corresponding to at least one of the multiple PLMN identities corresponding to the first cell is the same as the country corresponding to the candidate PLMN identity.
  • the terminal equipment selection PLMN process can be shown in Figure 11:
  • the AS of the UE reads the cell system information of each frequency band.
  • the cell system message may carry the PLMN ID list of the cell.
  • the cell system message may also carry country information.
  • the cell system message may carry the geographic location range or country boundary of the country.
  • the country information to which the PLMN ID belongs may be carried in the PLMN ID.
  • the cell system message may also carry indication information, where the indication information is used to indicate that the UE needs to select the PLMN ID of the country where the UE is currently located.
  • the indication information may be valid for one PLMN ID, or for multiple PLMN IDs, or for one cell, or for multiple cells, or for all PLMN ID lists.
  • the indication information may also be specified by a protocol.
  • the AS of the UE reports the PLMN ID list, country information and indication information to the NAS of the UE.
  • the AS layer of the UE scans the following cells:
  • Cell 1 Contains PLMN1, PLMN2, and PLMN3, where PLMN2 carries indication information.
  • Cell 2 Contains PLMN4, PLMN5, and PLMN6.
  • the cell system message of cell 2 carries indication information, which is valid for all three PLMN IDs.
  • Cell 3 contains PLMN7, PLMN8, and PLMN9, and the cell system message of cell 3 does not carry indication information.
  • the AS of the UE After reading the cell system information of the above-mentioned cell, the AS of the UE can report the PLMN1-9 and the indication information to the NAS of the UE.
  • the NAS of the UE selects a PLMN corresponding to one of the PLMN IDs as the PLMN used by the UE.
  • the PLMN selection may be automatically selected by the NAS, that is, the UE automatically completes the PLMN selection without involving human-computer interaction.
  • the PLMN selection may also be manually selected by the user.
  • the NAS of the UE uploads the PLMN ID to a higher layer, such as an application layer, and the user manually selects.
  • the display interface of the UE may display words such as China Unicom, China Mobile, etc. for the user to select.
  • the UE has a positioning capability, and can determine the current country in combination with the country information in the cell system message.
  • the UE automatically completes the PLMN selection, if the PLMN ID selected by the UE's NAS is associated with the indication information, the UE's NAS can determine whether the country where the UE is currently located is consistent with the country corresponding to the PLMN ID, and if not, the PLMN ID cannot be selected. .
  • the NAS of the UE can determine whether the country where the UE is currently located is the same as the country corresponding to the PLMN ID, and if not, it can prompt the user to make a new selection, for example A prompt such as "non-local PLMN, please select again" is displayed on the display interface of the UE, and the user is asked to make another selection until the user selects the PLMN of the current country.
  • the NAS of the UE can provide the AS of the UE with an EPLMN list and prohibited TAs according to the selected PLMN, and the EPLMN list and the prohibited TAs are used for cell selection and reselection.
  • the UE When the UE is in the RRC IDLE or INACTIVE state, it will perform cell selection and reselection. Since the UE has the positioning capability, the UE can also know which country it is in according to the current positioning during the moving process. In this embodiment of the present application, the UE may select a cell for camping during cell selection and reselection, and the cell must satisfy that at least one PLMN corresponding to the PLMN ID in the PLMN ID list of the cell is the PLMN of the country where the UE is currently located, otherwise , the UE cannot camp on the cell.
  • the terminal equipment selection PLMN process can also be shown in Figure 12:
  • the AS of the UE reads the cell system information of each frequency band.
  • the cell system message may carry the PLMN ID list of the cell.
  • the cell system message may also carry indication information, where the indication information is used to indicate that the UE needs to select the PLMN ID of the country where the UE is currently located.
  • the indication information may be valid for one PLMN ID, or for multiple PLMN IDs, or for one cell, or for multiple cells, or for all PLMN ID lists.
  • the indication information may also be specified by a protocol.
  • the AS of the UE reports the PLMN ID list and the indication information to the NAS of the UE.
  • step S1202 specific reference may be made to the method of reporting the PLMN ID list and the indication information to the NAS of the UE in the above step S1102, which will not be repeated here.
  • the NAS of the UE after receiving the PLMN list reported by the AS of the UE, the NAS of the UE selects a PLMN corresponding to one of the PLMN IDs as the PLMN used by the UE.
  • the PLMN selection may be automatically selected by the NAS, that is, the UE automatically completes the PLMN selection without involving human-computer interaction.
  • the PLMN selection may also be manually selected by the user.
  • the NAS of the UE uploads the PLMN ID to a higher layer, such as an application layer, and the user manually selects.
  • the display interface of the UE may display words such as China Unicom, China Mobile, etc. for the user to select.
  • the UE may not have the positioning capability, and the NAS of the UE receives the PLMN ID list reported by the AS of the UE, and determines the country where the UE is currently located according to the country corresponding to the PLMN ID in the PLMN ID list.
  • Country A has the most PLMN IDs, so it can be determined that the country where the UE is currently located is country A.
  • the MCC in the first half of the PLMN ID is the country code, if a certain MCC has the most PLMN IDs in the PLMN ID list, it can be determined that the country where the UE is currently located is the country corresponding to the MCC.
  • the NAS of the UE receives the following PLMN ID list from the AS of the UE:
  • the UE's NAS can determine whether the country where the UE is currently located is consistent with the country corresponding to the PLMN ID, and if not, the PLMN ID cannot be selected. .
  • the NAS of the UE can determine whether the country where the UE is currently located is the same as the country corresponding to the PLMN ID, and if not, it can prompt the user to make a new selection, for example A prompt such as "non-local PLMN, please select again" is displayed on the display interface of the UE, and the user is asked to make another selection until the user selects the PLMN of the current country.
  • step S1204 for details, refer to the above-mentioned step S1104, which will not be repeated here.
  • the methods provided in the embodiments of the present application can not only be used for PLMN selection, but also can be used for independent private network (standalone non-public network, SNPN) selection, non-independent private network (public network integrated- non-public network, PNI-NPN) selection, closed access group (CAG) selection, etc.
  • the methods of SNPN selection, PNI-NPN selection, and CAG selection are similar to those of PLMN selection. The difference is that in PLMN selection, UE searches for PLMN ID, and in SNPN selection, UE searches for SNPN ID.
  • SNPN ID can be determined by PLMN ID and network identification code (network ID).
  • NID UE searches for PNI-NPN ID in PNI-NPN selection
  • PNI-NPN ID can be composed of PLMN ID+CAG ID
  • the UE when selecting a PLMN, the UE first determines whether the selected PLMN is the PLMN of the current country, so that the UE can communicate normally under the supervision of the current country. It can also ensure the security and credibility of satellite communications and prevent the breeding of criminal activities.
  • the searched ground network can be used to determine the country where they are located and used for PLMN selection, so that UEs without positioning capability can also use the PLMN selection, cell selection and reselection in the process of the current location.
  • Normal communications under the supervision of the state can also ensure the security and credibility of satellite communications and prevent the breeding of criminal activities.
  • the embodiments of the present application provide a communication device, the structure of which may be as shown in FIG.
  • the communication apparatus may specifically be used to implement the method executed by the terminal device in the embodiments as shown in FIGS. 10 to 12 , and the apparatus may be the terminal device itself, or a chip or a chipset in the terminal device or a chip used to execute the related method. part of the function.
  • the transceiver unit 1303 is used to send and receive information; the storage unit 1301 is used to store the program code; the processing unit 1302 is used to call the program code stored in the storage unit 1301 to execute: determine the candidate PLMN identifier, the candidate PLMN identifier corresponding to the candidate PLMN identifier There are access requirements corresponding to the PLMN, and the access requirements are to allow the terminal equipment located in the country corresponding to the candidate PLMN to access; determine the country where the terminal equipment is currently located; when the country where the terminal equipment is currently located is consistent with the country corresponding to the candidate PLMN , it is determined that the candidate PLMN access is selected by the transceiver unit 1303 .
  • the candidate PLMN satisfies the following conditions, the candidate PLMN has access requirements: the candidate PLMN identifier is associated with the indication information, and the indication information is used to indicate that the terminal device needs to select the PLMN identifier of the country where it is located.
  • the indication information is associated with a PLMN identity, and the PLMN identity is a candidate PLMN identity.
  • the indication information is associated with a PLMN identity group, the PLMN identity group includes at least one PLMN identity, and the at least one PLMN identity includes candidate PLMN identity.
  • the indication information is associated with a cell, and the PLMN identity of the cell includes the candidate PLMN identity.
  • the indication information is associated with a cell group, the cell group includes at least one cell, and the PLMN identifier of the at least one cell includes a candidate PLMN identifier.
  • the transceiver unit 1303 is configured to receive a candidate PLMN identifier sent by the access network, where the candidate PLMN identifier carries indication information.
  • the transceiver unit 1303 is further configured to receive country information sent by the access network device, where the country information indicates the geographic location range of the corresponding country, or the country information indicates the country boundary of the corresponding country; the processing unit 1302, after determining When the country where the terminal device is currently located, it is specifically used for: acquiring the current location of the terminal device; and determining the country where the terminal device is currently located according to the country information and the location.
  • the processing unit 1302 is specifically configured to: if the location is within the geographic location range of the corresponding country indicated by the country information, the terminal device determines the terminal device The current country is the corresponding country; or, if the location is not within the geographic location range of the corresponding country indicated by the country information, and the distance between the location and the national border of the corresponding country indicated by the country information is less than the distance threshold, then Determine the country where the terminal device is currently located as the corresponding country.
  • the transceiver unit 1303 may also be configured to receive N PLMN identifiers sent by the access network device, where one PLMN identifier corresponds to one country.
  • the processing unit 1302 when determining the country where the terminal device is currently located, may be specifically configured to: determine that the country where the terminal device is currently located is the first country, wherein among the N PLMN identities, the number of PLMN identities corresponding to the first country is the largest .
  • the processing unit 1302 may be further configured to: select a first cell to camp on, and the country corresponding to at least one PLMN identity of the multiple PLMN identities corresponding to the first cell is the same as the country corresponding to the candidate PLMN identity.
  • the division of modules in the embodiments of the present application is schematic, and is only a logical function division. In actual implementation, there may be other division methods.
  • the functional modules in the various embodiments of the present application may be integrated into one processing unit. In the device, it can also exist physically alone, or two or more modules can be integrated into one module.
  • the above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. It can be understood that, for the functions or implementations of each module in the embodiments of the present application, further reference may be made to the related descriptions of the method embodiments.
  • the communication device may be as shown in FIG. 14 , and the communication device may be a communication device or a chip in the communication device, where the communication device may be a terminal device or a network device.
  • the apparatus may include a processor 1401 , a communication interface 1402 , and a memory 1403 .
  • the processing unit 1302 may be the processor 1401 .
  • the transceiver unit 1303 may be the communication interface 1402 .
  • the processor 1401 may be a central processing unit (central processing unit, CPU), or a digital processing module or the like.
  • the communication interface 1402 may be a transceiver, an interface circuit such as a transceiver circuit, or a transceiver chip or the like.
  • the apparatus further includes: a memory 1403 for storing programs executed by the processor 1401 .
  • the memory 1403 may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., or a volatile memory (volatile memory), such as random access memory (random access memory) -access memory, RAM).
  • Memory 1403 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto.
  • the processor 1401 is used for executing the program code stored in the memory 1403, and is specifically used for executing the actions of the above-mentioned processing unit 1302, which will not be repeated in this application.
  • the communication interface 1402 is specifically configured to perform the actions of the above-mentioned transceiver unit 1303, and details are not described herein again in this application.
  • the specific connection medium between the communication interface 1402 , the processor 1401 , and the memory 1403 is not limited in the embodiments of the present application.
  • the memory 1403, the processor 1401, and the communication interface 1402 are connected through a bus 1404 in FIG. 14.
  • the bus is represented by a thick line in FIG. 14, and the connection between other components is only for schematic illustration. , is not limited.
  • the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is shown in FIG. 14, but it does not mean that there is only one bus or one type of bus.
  • the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
  • computer-usable storage media including, but not limited to, disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions
  • the apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

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  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un appareil de sélection de réseaux mobiles terrestres publics, qui sont utilisés pour résoudre le problème des difficultés lors d'une communication normale en raison du fait que, dans un réseau de communication non terrestre, un réseau mobile terrestre public sélectionné par un dispositif terminal peut ne pas être un réseau mobile terrestre public d'un pays dans lequel se trouve le réseau mobile terrestre public sélectionné. Le procédé comprend les étapes suivantes : un dispositif terminal détermine un identifiant de réseau mobile terrestre public candidat, un réseau mobile terrestre public candidat correspondant à l'identifiant de réseau mobile terrestre public candidat ayant en conséquence une exigence d'accès, l'exigence d'accès permettant l'accès d'un dispositif terminal dans un pays correspondant au réseau mobile terrestre public candidat ; et le dispositif terminal détermine un pays dans lequel le dispositif terminal est actuellement situé, et lorsque le pays dans lequel le dispositif terminal est actuellement situé est conforme au pays correspondant au réseau mobile terrestre public candidat, détermine de sélectionner le réseau mobile terrestre public candidat pour un accès.
PCT/CN2020/106609 2020-08-03 2020-08-03 Procédé et appareil de sélection de réseaux mobiles terrestres publics WO2022027187A1 (fr)

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