WO2023075994A1 - Sélection de réseau sans fil dans des zones internationales - Google Patents

Sélection de réseau sans fil dans des zones internationales Download PDF

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Publication number
WO2023075994A1
WO2023075994A1 PCT/US2022/045585 US2022045585W WO2023075994A1 WO 2023075994 A1 WO2023075994 A1 WO 2023075994A1 US 2022045585 W US2022045585 W US 2022045585W WO 2023075994 A1 WO2023075994 A1 WO 2023075994A1
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WO
WIPO (PCT)
Prior art keywords
plmn
mcc
selection
list
shared
Prior art date
Application number
PCT/US2022/045585
Other languages
English (en)
Inventor
Amer Catovic
Osama Lotfallah
Lenaig Genevieve CHAPONNIERE
Stephen William Edge
Bharat Shrestha
Francesco Pica
Original Assignee
Qualcomm Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US17/582,696 external-priority patent/US20230134628A1/en
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to KR1020247011659A priority Critical patent/KR20240099163A/ko
Priority to CN202280071153.8A priority patent/CN118140532A/zh
Priority to EP22797966.3A priority patent/EP4424073A1/fr
Publication of WO2023075994A1 publication Critical patent/WO2023075994A1/fr

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Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18545—Arrangements for managing station mobility, i.e. for station registration or localisation
    • 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

Definitions

  • aspects of the present disclosure generally relate to wireless communications, and more particularly to techniques and apparatuses for network selection for satellite access in international areas.
  • Wireless communications systems are widely deployed to provide various telecommunications services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communications systems may employ multiple-access technologies capable of supporting communications with multiple users by sharing available system resources (e.g., bandwidth, transmit power, and/or the like).
  • multipleaccess technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, orthogonal frequency-division multiple access (OFDMA) systems, singlecarrier frequency-division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE).
  • LTE/LTE-Advanced is a set of enhancements to the universal mobile telecommunications system (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).
  • UMTS universal mobile telecommunications system
  • a wireless communications network may include a number of base stations (BSs) that can support communications for a number of user equipment (UEs).
  • a user equipment (UE) may communicate with a base station (BS) via the downlink and uplink.
  • the downlink (or forward link) refers to the communications link from the BS to the UE
  • the uplink (or reverse link) refers to the communications link from the UE to the BS.
  • a BS may be referred to as a Node B, a gNB, an access point (AP), a radio head, a transmit and receive point (TRP), a new radio (NR) BS, a 5GNode B, and/or the like.
  • New radio which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP).
  • 3GPP Third Generation Partnership Project
  • NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL), using CP-OFDM and/or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.
  • OFDM orthogonal frequency division multiplexing
  • SC-FDM e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)
  • MIMO multiple-input multiple-output
  • a method of wireless communication by a user equipment includes determining whether the UE transitioned between an international area and a national area. The method further includes triggering a public land mobile network (PLMN) selection of a network for receiving service, in response to the UE having transitioned between the international area and the national area.
  • PLMN public land mobile network
  • a method of wireless communication by a user equipment includes performing a public land mobile network (PLMN) search for a higher priority PLMN.
  • the method also includes determining a list of candidate PLMNs based on the search.
  • the method further includes selecting a PLMN from among the list of candidate PLMNs in response to an identity of a serving PLMN not being a shared mobile country code (MCC), the candidate PLMNs having either an MCC the same as an identity of the serving PLMN or a shared MCC.
  • MCC mobile country code
  • a user equipment having a memory and one or more processor(s) coupled to the memory.
  • the processor(s) is configured to determine whether the UE transitioned between an international area and a national area.
  • the processor(s) is further configured to trigger a public land mobile network (PLMN) selection of a network for receiving service, in response to the UE having transitioned between the international area and the national area.
  • PLMN public land mobile network
  • a user equipment having a memory and one or more processor(s) coupled to the memory.
  • the processor(s) is configured to perform a public land mobile network (PLMN) search for a higher priority PLMN.
  • the processor(s) is also configured to determine a list of candidate PLMNs based on the search.
  • the processor(s) is further configured to select a PLMN from among the list of candidate PLMNs in response to an identity of a serving PLMN not being a shared mobile country code (MCC), the candidate PLMNs having either an MCC the same as an identity of the serving PLMN or a shared MCC.
  • MCC mobile country code
  • aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communications device, and processing system as substantially described with reference to and as illustrated by the accompanying drawings and specification.
  • FIGURE l is a block diagram conceptually illustrating an example of a wireless communications network, in accordance with various aspects of the present disclosure.
  • FIGURE 2 is a block diagram conceptually illustrating an example of a base station in communication with a user equipment (UE) in a wireless communications network, in accordance with various aspects of the present disclosure.
  • UE user equipment
  • FIGURE 3 is a diagram illustrating a deployment scenario of a nonterrestrial network (NTN), in accordance with aspects of the present disclosure.
  • NTN nonterrestrial network
  • FIGURE 4 is a diagram illustrating a deployment scenario of a nonterrestrial network (NTN), in accordance with aspects of the present disclosure.
  • NTN nonterrestrial network
  • FIGURE 5 is a diagram illustrating another deployment scenario of a nonterrestrial network (NTN), in accordance with aspects of the present disclosure.
  • NTN nonterrestrial network
  • FIGURE 6 is a flow diagram illustrating public land mobile network (PLMN) selection when a UE is located in an international area, in accordance with aspects of the present disclosure.
  • FIGURE 7 is a flow diagram illustrating public land mobile network (PLMN) selection when a UE is served by a PLMN with a shared PLMN ID, in accordance with aspects of the present disclosure.
  • PLMN public land mobile network
  • FIGURE 8 is a flow diagram illustrating an example process performed, for example, by a user equipment (UE), in accordance with various aspects of the present disclosure.
  • UE user equipment
  • FIGURE 9 is a flow diagram illustrating another example process performed, for example, by a user equipment (UE), in accordance with various aspects of the present disclosure.
  • UE user equipment
  • FIGURE 10 is a flow diagram illustrating another example process performed, for example, by a user equipment (UE), in accordance with various aspects of the present disclosure.
  • UE user equipment
  • aspects of the present disclosure provide techniques for performing public land mobile network (PLMN) selection for non-terrestrial network (NTN) access, for example, via a satellite.
  • PLMN public land mobile network
  • NTN non-terrestrial network
  • a satellite coverage area may span multiple countries and international areas. International areas include areas outside any jurisdiction of a country, and may also be referred to as extraterritorial areas.
  • a legacy PLMN selection procedure is a procedure a user equipment (UE) uses to select a network to camp on and receive service.
  • UE user equipment
  • aspects of the present disclosure address scenarios the legacy procedure does not cover, such as when the UE is physically located in an international area, or when the UE is served by a PLMN with a shared PLMN identity (ID), or when a radio cell is deployed to cover a geographical area located in an international area.
  • the techniques described may be deployed, for example, by a UE to perform PLMN selection for NTN (e.g., satellite) access.
  • NTN access may be considered as a separate radio access technology (RAT) from terrestrial access.
  • RAT radio access technology
  • the UE may apply a first option including triggering PLMN selection upon leaving or entering the international area.
  • the UE may also consider the home public land mobile network (HPLMN) list or equivalent home public land mobile network (EHPLMN) list as highest priority, instead of a recently registered PLMN. This may occur in addition to the first option, or instead of the first option.
  • the UE may implement a third option, using a separate international PLMN selector list or relying on indications of whether a PLMN is intended for international access, that is, when coverage from a PLMN extends into an international area.
  • the UE may delete the equivalent PLMN list. If a periodic search for a high priority PLMN (HP -PLMN) occurs while the UE is roaming, the UE may apply a fifth option where the UE does not limit the search based on the mobile country code (MCC).
  • MCC mobile country code
  • the UE When the UE is served by a PLMN with a shared PLMN ID (e.g., with a mobile country code (MCC) starting with a nine, such as 9xx), the UE may be inside an international area, or outside an international area. In either case, it would be beneficial to have an improved PLMN selection procedure. According to aspects of the present disclosure, if the UE is served by a PLMN with a shared PLMN ID, during a PLMN search for a high priority public land mobile network (HP-PLMN), the UE does not eliminate the candidate PLMNs that have a different MCC from the serving PLMN.
  • HP-PLMN public land mobile network
  • the UE may implement the third option, using a separate international PLMN selector list or relying on indications of whether a PLMN is intended for international access.
  • FIGURE 1 is a diagram illustrating a network 100 in which aspects of the present disclosure may be practiced.
  • the network 100 may be a 5G or NR. network or some other wireless network, such as an LTE network.
  • the wireless network 100 may include a number of BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 1 lOd) and other network entities.
  • a BS is an entity that communicates with user equipment (UEs) and may also be referred to as a base station, an NR. BS, a Node B, a gNB, a 5G node B (NB), an access point, a transmit and receive point (TRP), and/or the like.
  • Each BS may provide communications coverage for a particular geographic area.
  • the term “cell” can refer to a coverage area of a BS and/or a BS subsystem serving this coverage area, depending on the context in which the term is used.
  • a BS may provide communications coverage for a macro cell, a pico cell, a femto cell, and/or another type of cell.
  • a macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription.
  • a pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription.
  • a femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs having association with the femto cell (e.g., UEs in a closed subscriber group (CSG)).
  • CSG closed subscriber group
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a pico cell may be referred to as a pico BS.
  • a BS for a femto cell may be referred to as a femto BS or a home BS.
  • a BS 110a may be a macro BS for a macro cell 102a
  • a BS 110b may be a pico BS for a pico cell 102b
  • a BS 110c may be a femto BS for a femto cell 102c.
  • a BS may support one or multiple (e.g., three) cells.
  • the terms “eNB,” “base station,” “NR BS,” “gNB,” “TRP,” “AP,” “node B,” “5G NB,” and “cell” may be used interchangeably.
  • a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile BS.
  • the BSs may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces such as a direct physical connection, a virtual network, and/or the like using any suitable transport network.
  • the wireless network 100 may also include relay stations.
  • a relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send a transmission of the data to a downstream station (e.g., a UE or a BS).
  • a relay station may also be a UE that can relay transmissions for other UEs.
  • a relay station 1 lOd may communicate with macro BS 110a and a UE 120d in order to facilitate communications between the BS 110a and UE 120d.
  • a relay station may also be referred to as a relay BS, a relay base station, a relay, and/or the like.
  • the wireless network 100 may be a heterogeneous network that includes BSs of different types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/or the like. These different types of BSs may have different transmit power levels, different coverage areas, and different impact on interference in the wireless network 100.
  • macro BSs may have a high transmit power level (e.g., 5 to 40 Watts) whereas pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 Watts).
  • the BSs 110 may exchange communications via backhaul links 132 (e.g., SI, etc.).
  • backhaul links 132 e.g., SI, etc.
  • Base stations 110 may communicate with one another over other backhaul links (e.g., X2, etc.) either directly or indirectly (e.g., through core network 130).
  • the core network 130 may be an evolved packet core (EPC), which may include at least one mobility management entity (MME), at least one serving gateway (S-GW), and at least one packet data network (PDN) gateway (P-GW).
  • EPC evolved packet core
  • MME mobility management entity
  • S-GW serving gateway
  • PDN packet data network gateway
  • the MME may be the control node that processes the signaling between the UEs 120 and the EPC. All user IP packets may be transferred through the S-GW, which itself may be connected to the P-GW.
  • the P-GW may provide IP address allocation as well as other functions.
  • the P-GW may be connected to the network operator's IP services.
  • the operator's IP services may include the Internet, the Intranet, an IP multimedia subsystem (IMS), and a packet-switched (PS) streaming service.
  • IMS IP multimedia subsystem
  • PS packet-switched
  • the core network 130 may provide user authentication, access authorization, tracking, IP connectivity, and other access, routing, or mobility functions.
  • One or more of the base stations 110 or access node controllers (ANCs) may interface with the core network 130 through backhaul links 132 (e.g., SI, S2, etc.) and may perform radio configuration and scheduling for communications with the UEs 120.
  • backhaul links 132 e.g., SI, S2, etc.
  • various functions of each access network entity or base station 110 may be distributed across various network devices (e.g., radio heads and access network controllers) or consolidated into a single network device (e.g., a base station 110).
  • UEs 120 may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile.
  • a UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, and/or the like.
  • a UE may be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communications device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, biometric sensors/devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicular component or sensor, smart meters/sensors, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium.
  • a cellular phone e.g., a smart phone
  • PDA personal digital assistant
  • WLL wireless local loop
  • One or more UEs 120 may establish a protocol data unit (PDU) session for a network slice.
  • the UE 120 may select a network slice based on an application or subscription service. By having different network slices serving different applications or subscriptions, the UE 120 may improve its resource utilization in the wireless network 100, while also satisfying performance specifications of individual applications of the UE 120.
  • the network slices used by UE 120 may be served by an AMF (not shown in FIGURE 1) associated with one or both of the base station 110 or core network 130.
  • AMF access and mobility management function
  • the UEs 120 may include a PLMN selection module 140.
  • the PLMN selection module 140 may determine whether the UE transitioned between an international area and a national area.
  • the PLMN selection module 140 may also trigger a public land mobile network (PLMN) selection in response to the UE having transitioned between the international area and the national area.
  • the PLMN selection module 140 may perform a public land mobile network (PLMN) search for a higher priority PLMN.
  • PLMN selection module 140 may also determine a list of candidate PLMNs based on the search.
  • the PLMN selection module 140 may select a PLMN from among the list of candidate PLMNs in response to an identity of a serving PLMN not being a shared mobile country code (MCC).
  • MCC shared mobile country code
  • Some UEs may be considered machine-type communications (MTC) or evolved or enhanced machine-type communications (eMTC) UEs.
  • MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, and/or the like, that may communicate with a base station, another device (e.g., remote device), or some other entity.
  • a wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communications link.
  • Some UEs may be considered Internet-of-Things (loT) devices, and/or may be implemented as NB-IoT (narrowband internet of things) devices. Some UEs may be considered a customer premises equipment (CPE).
  • UE 120 may be included inside a housing that houses components of UE 120, such as processor components, memory components, and/or the like.
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support a particular radio access technology (RAT) and may operate on one or more frequencies.
  • a RAT may also be referred to as a radio technology, an air interface, and/or the like.
  • a frequency may also be referred to as a carrier, a frequency channel, and/or the like.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • NR or 5G RAT networks may be deployed.
  • two or more UEs 120 may communicate directly using one or more sidelink channels (e.g., without using a base station 110 as an intermediary to communicate with one another).
  • the UEs 120 may communicate using peer-to-peer (P2P) communications, device-to-device (D2D) communications, a vehicle-to-everything (V2X) protocol (e.g., which may include a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, and/or the like), a mesh network, and/or the like.
  • P2P peer-to-peer
  • D2D device-to-device
  • V2X vehicle-to-everything
  • V2V vehicle-to-everything
  • the UE 120 may perform scheduling operations, resource selection operations, and/or other operations described elsewhere as being performed by the base station 110.
  • the base station 110 may configure a UE 120 via downlink control information (DCI), radio resource control (RRC) signaling, a media access control-control element (MAC-CE) or via system information (e.g., a system information block (SIB).
  • DCI downlink control information
  • RRC radio resource control
  • MAC-CE media access control-control element
  • SIB system information block
  • FIGURE 1 is provided merely as an example. Other examples may differ from what is described with regard to FIGURE 1.
  • FIGURE 2 shows a block diagram of a design 200 of the base station 110 and UE 120, which may be one of the base stations and one of the UEs in FIGURE 1.
  • the base station 110 may be equipped with T antennas 234a through 234t
  • UE 120 may be equipped with R antennas 252a through 252r, where in general T > 1 and R > 1.
  • a transmit processor 220 may receive data from a data source 212 for one or more UEs, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQIs) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS(s) selected for the UE, and provide data symbols for all UEs. Decreasing the MCS lowers throughput but increases reliability of the transmission.
  • MCS modulation and coding schemes
  • the transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI) and/or the like) and control information (e.g., CQI requests, grants, upper layer signaling, and/or the like) and provide overhead symbols and control symbols.
  • the transmit processor 220 may also generate reference symbols for reference signals (e.g., the cell-specific reference signal (CRS)) and synchronization signals (e.g., the primary synchronization signal (PSS) and secondary synchronization signal (SSS)).
  • reference signals e.g., the cell-specific reference signal (CRS)
  • synchronization signals e.g., the primary synchronization signal (PSS) and secondary synchronization signal (SSS)
  • a transmit (TX) multiple-input multiple-output (MEMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t.
  • Each modulator 232 may process a respective output symbol stream (e.g., for OFDM and/or the like) to obtain an output sample stream.
  • Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.
  • the synchronization signals can be generated with location encoding to convey additional information.
  • antennas 252a through 252r may receive the downlink signals from the base station 110 and/or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively.
  • Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a received signal to obtain input samples.
  • Each demodulator 254 may further process the input samples (e.g., for OFDM and/or the like) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for the UE 120 to a data sink 260, and provide decoded control information and system information to a controller/processor 280.
  • a channel processor may determine reference signal received power (RSRP), received signal strength indicator (RS SI), reference signal received quality (RSRQ), channel quality indicator (CQI), and/or the like.
  • RSRP reference signal received power
  • RS SI received signal strength indicator
  • RSRQ reference signal received quality
  • CQI channel quality indicator
  • one or more components of the UE 120 may be included in a housing.
  • a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports comprising RSRP, RSSI, RSRQ, CQI, and/or the like) from the controller/processor 280. Transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, and/or the like), and transmitted to the base station 110.
  • modulators 254a through 254r e.g., for DFT-s-OFDM, CP-OFDM, and/or the like
  • the uplink signals from the UE 120 and other UEs may be received by the antennas 234, processed by the demodulators 254, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 120.
  • the receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to a controller/processor 240.
  • the base station 110 may include communications unit 244 and communicate to the core network 130 via the communications unit 244.
  • the core network 130 may include a communications unit 294, a controller/processor 290, and a memory 292.
  • the controller/processor 240 of the base station 110, the controller/processor 280 of the UE 120, and/or any other component(s) of FIGURE 2 may perform one or more techniques associated with PLMN selection, as described in more detail elsewhere.
  • the controller/processor 240 of the base station 110, the controller/processor 280 of the UE 120, and/or any other component(s) of FIGURE 2 may perform or direct operations of, for example, the processes of FIGURES 6-10 and/or other processes as described.
  • Memories 242 and 282 may store data and program codes for the base station 110 and UE 120, respectively.
  • a scheduler 246 may schedule UEs for data transmission on the downlink and/or uplink.
  • the UE 120 may include means for determining, means for switching, means for selecting, means for triggering, means for prioritizing, means for deleting, means for retrieving, and/or means for receiving. Such means may include one or more components of the UE 120 described in connection with FIGURE 2. [0051] As indicated above, FIGURE 2 is provided merely as an example. Other examples may differ from what is described with regard to FIGURE 2.
  • aspects of the present disclosure provide techniques for performing PLMN selection for non-terrestrial network (NTN) access, for example, via a satellite.
  • NTN non-terrestrial network
  • a satellite coverage area may span multiple countries and international areas. International areas include areas outside any jurisdiction of a country, and may also be referred to as extraterritorial areas.
  • a legacy PLMN selection procedure is a procedure the UE uses to select a network to camp on and receive service (e.g., as specified in 3GPP TS 23.122).
  • Aspects of the present disclosure address scenarios the legacy procedure does not cover, such as when the UE is physically located in an international area, or when the UE is served by a PLMN with a shared PLMN identity (ID).
  • ID has a three- digit mobile country code (MCC) starting with a nine, for example 9xx, where the x’s can be any numbers.
  • MCC mobile country code
  • a shared PLMN ID may also be referred to as a global PLMN ID.
  • a new branch of a PLMN selection procedure is introduced.
  • the UE first decides whether it is located inside an international area. If so, the UE follows a new PLMN selection procedure. If not, the UE follows the legacy PLMN selection procedure.
  • the legacy PLMN selection procedure can trigger in one of two ways. The first is returning from loss of coverage, such as when a UE powers up, or loses and regains service. In this scenario, PLMNs are to be selected in a particular order. The UE will initially look to select the last registered PLMN, if available.
  • the UE proceeds down an ordered list of PLMNs to select in the following order: i) Either the home PLMN (HPLMN) (if the equivalent HPLMN (EHPLMN) list is not present or is empty) or the highest priority EHPLMN that is available (if the EHPLMN list is present); ii) Each PLMN and/or radio access technology (RAT) combination in the “User Controlled PLMN Selector with Access Technology” data file in the subscriber identity module (SIM) (e.g., in priority order); iii) Each PLMN and/or radio access technology combination in the “Operator Controlled PLMN Selector with Access Technology” data file in the SIM (e.g., in priority order) or stored in the UE (e.g., in priority order); iv) Other PLMN and/or radio access technology combinations with received high signal quality (e.g., in random order); or v) Other PLMN and/or radio access technology combinations in
  • Another legacy PLMN selection procedure triggers periodically when the UE is currently being served by a PLMN, such as when the UE is roaming. That is, a roaming UE periodically searches for a higher priority PLMN and re-selects to a higher priority PLMN in the same country as the serving (current) PLMN (e.g., according to the same prioritization as the PLMN selection upon returning from coverage loss). In some cases, the UE may also consider PLMNs in a list of equivalent PLMNs provided by the serving PLMN (e.g., using non-access stratum (NAS) protocol signaling during the registration procedure).
  • NAS non-access stratum
  • NTN non-terrestrial network
  • FIGURES 3 and 4 are diagrams illustrating deployment scenarios of nonterrestrial networks (NTNs), in accordance with aspects of the present disclosure.
  • FIGURE 3 shows a deployment where NTN cell coverage targets one country (e.g., Country A) and that country’s contiguous waters. In general, contiguous waters extend up to 200 miles from the shore of a given country. This is referred to as leakage into international waters.
  • the broadcast PLMN ID has the mobile country code (MCC) of Country A.
  • MCC mobile country code
  • the PLMN ID includes the MCC of Country A and a shared MCC reserved for the international waters.
  • FIGURE 4 shows a deployment where NTN cell coverage targets international waters only. In this deployment, there is leakage into adjacent contiguous waters of Country A.
  • the PLMN ID may be broadcast in accordance with different scenarios. In a first scenario, the MCC of the home country of the operator is included in the PLMN ID. In a second scenario, the shared MCC is included. In a third scenario, the MCC of the home country of the operator and the shared MCC reserved for international waters is included.
  • FIGURE 5 is a diagram illustrating another deployment scenario of a nonterrestrial network (NTN), in accordance with aspects of the present disclosure.
  • FIGURE 5 shows a deployment of a legacy satellite-based deployment scenario for ships (e.g., a ship 502) and airplanes (not shown), via a satellite 506.
  • the satellite link is used only as backhaul.
  • 3GPP access may be provided by an onboard radio access network (RAN) 504.
  • RAN radio access network
  • This deployment would be applicable to international waters and/or airspace (e.g., if the ship 502 is instead an aircraft).
  • this deployment may experience little or no issues with cross-border leakage or with PLMN ID usage.
  • a UE may implement a modified version of a PLMN selection procedure in order to access a network, such as an NTN, from within an international area or when a UE is served by a PLMN with a shared PLMN ID.
  • the UE may generate a list of available PLMNs that are allowed to be selected from within an international area or when a UE is served by a PLMN with a shared PLMN ID, and perform PLMN selection based on the new list.
  • Other solutions will also be described, such as triggering PLMN selection when transitioning between an international area and a national area.
  • NTN access may be considered as a separate radio access technology (RAT) from terrestrial access.
  • RAT radio access technology
  • NTN access may use a separate frequency band as compared to terrestrial access.
  • a UE performing PLMN selection for non-terrestrial (satellite) access is configured with “User Controlled PLMN Selector with Access Technology” and/or “Operator Controlled PLMN Selector with Access Technology” files in the Universal SIM (USIM).
  • Each of these files may contain a prioritized (e.g., ordered) list of PLMNs with corresponding supported RATs.
  • the PLMN selection procedure may be executed at the NAS protocol layer.
  • each PLMN may broadcast, in the system information, its own identity (e.g., PLMN ID), which includes a MCC uniquely defining the country of the PLMN.
  • PLMN ID e.g., the identity of the PLMN.
  • lower layers e.g., the access stratum (AS)
  • AS access stratum
  • the PLMN IDs with a shared MCC e.g., 9xx
  • These PLMN IDs are used for international areas, but not exclusively.
  • the UE During a legacy periodic PLMN search for a high priority PLMN (HP- PLMN), the UE eliminates candidate PLMNs that have a different MCC from the serving PLMN.
  • the rationale is to limit the search to the same country. This should not occur if the UE knows that it is located inside international areas.
  • the UE does not limit the search to the same MCC as the serving PLMN. For example, if the identity of the serving PLMN is not a shared MCC, the UE selects from among candidate PLMNs having either an MCC the same as an identity of the serving PLMN or a shared MCC.
  • the selected PLMN has a higher priority than the serving PLMN. If the identity of the serving PLMN is a shared MCC, the UE selects a PLMN from among candidate PLMNs having either a shared MCC or an MCC corresponding to the country where the UE is currently geographically located.
  • the UE During a legacy periodic PLMN search for a high priority PLMN (HP- PLMN), the UE considers the equivalent PLMN list provided by the serving PLMN. This should not occur if the serving PLMN was not selected when the UE was located inside international areas. For example, the UE could belong to a Canadian customer who leaves port from the United States. In this case, the equivalent PLMN list supplied by the last serving PLMN in the United States may not be valid when on international waters for a Canadian customer. According to aspects of the present disclosure, upon entering an international area, the UE deletes the equivalent PLMN list provided by the last serving PLMN, prior to PLMN selection.
  • the UE always considers the last registered PLMN (RPLMN) as the highest priority for PLMN selection. This should not be the case by default when transitioning into international areas or out from international areas. For example, the UE could belong to a Canadian customer who leaves port from the United States. In this case, the customer may prefer a Canadian PLMN when on international waters, instead of the United States PLMN serving the port.
  • the UE does not consider the RPLMN as the highest priority PLMN when transitioning to or from an international area. Rather, the UE considers the HPLMN list or EHPLMN list (retrieved from the USIM) as highest priority as with PLMN selection upon power-up. Thus, the UE may not select the RPLMN because the UE is transitioning to/from an international area.
  • the UE triggers PLMN selection when the UE finds itself inside international areas.
  • the UE also triggers PLMN selection when the UE leaves international areas.
  • the new triggers may be for PLMN selection upon recovery from lack of coverage. These new triggers may be in addition to legacy triggers.
  • the UE may perform PLMN selection in a manner similar to PLMN selection upon power up or recovery from lack of coverage. For example, when a UE finds itself out of coverage of the RPLMN for a certain period of time, the UE will declare an “out of service” (OOS) condition.
  • OOS out of service
  • the UE considers itself de-registered from the RPLMN and performs PLMN selection.
  • the UE first performs a PLMN search (also referred to as a PLMN scan) and creates a list of candidate PLMNs based on the search. According to these aspects, if the RPLMN is in the candidate list, it is considered as the highest priority PLMN candidate. If the RPLMN is not in the candidate list, the UE follows the prioritized list, for example, a list stored in the USIM.
  • the UE may perform PLMN selection in a manner similar to when completing a periodic search for a higher priority PLMN. For example, while registered with a serving PLMN which is not the highest priority PLMN (e.g., HPLMN or EHPLMN), the UE periodically performs a higher priority (HP) PLMN scan. The periodicity of the search is decided by the UE where the network sets the minimum value for the period (minimum periodic search timer). After each search, the UE creates a list of candidate PLMNs. According to these aspects, only the PLMNs with the same MCC as the serving PLMN are retained in the candidate list, unless a shared MCC exists. The UE then follows the prioritized list to select the highest priority PLMN.
  • a serving PLMN which is not the highest priority PLMN (e.g., HPLMN or EHPLMN)
  • HP higher priority
  • the periodicity of the search is decided by the UE where the network sets the minimum value for the period (mini
  • the UE has a separate PLMN selector list in the USIM designated for international areas.
  • the separate international list may have different priorities than the legacy PLMN selector lists.
  • a new indication that the PLMN can be selected in international areas can be added to the legacy PLMN selector lists.
  • the broadcast channel of the radio cell of the PLMN may include the indication that the PLMN of the radio cell is intended for international access.
  • the indication may be retrieved from a USIM.
  • the UE may consider the PLMN of the radio cell as intended for international access. These aspects may apply to the scenario shown by FIGURE 5, for example.
  • the new indication may be implemented as a binary flag.
  • the new indication may be implemented as an MCC associated with international areas.
  • FIGURE 6 is a flow diagram illustrating public land mobile network (PLMN) selection when a UE is located in an international area, in accordance with aspects of the present disclosure.
  • PLMN selection starts. For example, selection may start based on loss of coverage (e.g., during power up) or while roaming.
  • the UE determines its physical location. Based on the location, the UE determines whether it is located in an international area, at block 630. If not, legacy PLMN selection occurs at block 640. If the UE is located inside an international area, at block 650 the logic follows a separate branch in the PLMN selection procedure, where the UE starts an international PLMN selection procedure.
  • the UE may apply a first option including triggering PLMN selection upon leaving or entering the international area.
  • the UE may also consider the HPLMN list or EHPLMN list as highest priority, instead of a recently registered PLMN. This may occur in addition to the first option, or instead of the first option.
  • the UE may implement a third option, using a separate international PLMN selector list or relying on indications of whether a PLMN is for international access.
  • the UE may delete the equivalent PLMN list. If a periodic search for a higher priority PLMN occurs, the UE may apply a fifth option where the UE does not limit the search based on the MCC.
  • the UE When the UE is served by a PLMN with a shared PLMN ID (e.g., with MCC 9xx), the UE may be inside an international area or outside an international area. In either case, it would be beneficial to have an improved PLMN selection procedure. Issues with the legacy PLMN selection procedure in this scenario include: during periodic PLMN search for the HP -PLMN, the UE eliminates the candidate PLMNs that have a different MCC from the serving PLMN. The rationale is to limit the search to the same country. This should not occur if the serving PLMN has a shared PLMN ID (e.g., where the MCC is 9xx) or the candidate PLMN has a shared PLMN ID.
  • a shared PLMN ID e.g., where the MCC is 9xx
  • the UE if the UE is served by a PLMN with a shared PLMN ID, during a PLMN search for a HP -PLMN, the UE does not eliminate the candidate PLMNs that have a different MCC from the serving PLMN.
  • the UE may select PLMNs with a MCC corresponding to the country where the UE is located in addition to PLMNs with the shared MCC.
  • an identity of the serving PLMN is not a shared MCC
  • the UE may select a PLMN with an MCC the same as that of the serving PLMN or select a PLMN with a shared MCC. This applies to both PLMN selection inside international areas and within a country.
  • the UE may use a separate international PLMN selector list or rely on indications of whether a PLMN is intended for international access.
  • FIGURE 7 is a flow diagram illustrating public land mobile network (PLMN) selection when a UE is served by a PLMN with a shared PLMN ID, in accordance with aspects of the present disclosure.
  • PLMN selection starts. For example, selection may start based on UE roaming.
  • the UE determines its physical location. Based on the location, the UE determines whether it is located in an international area at block 730. If not, at block 740, a PLMN selection procedure for when inside a country occurs. If the UE is located inside an international area, at block 750 the UE starts an international PLMN selection procedure.
  • the UE may apply a sixth option.
  • the UE During a legacy periodic PLMN search for a high priority PLMN (HP-PLMN), the UE eliminates candidate PLMNs that have a different MCC from the serving PLMN.
  • the UE does not limit the search to the same MCC as the serving PLMN. This option applies regardless of whether the UE is in an international area. Rather, the option applies when the UE is served with a shared PLMN ID.
  • the UE may implement the third option, using a separate international PLMN selector list or relying on indications of whether a PLMN is intended for international access.
  • FIGURES 3-7 are provided as examples. Other examples may differ from what is described with respect to FIGURES 3-7.
  • FIGURE 8 is a flow diagram illustrating an example process 800 performed, for example, by a UE, in accordance with various aspects of the present disclosure.
  • the example process 800 is an example of wireless network selection for satellite access in international areas.
  • the process 800 may include performing a public land mobile network (PLMN) search for a higher priority PLMN (block 802).
  • PLMN public land mobile network
  • the UE e.g., using the antenna 252, DEMOD/MOD 254, MIMO detector 256, TX MIMO processor 266, receive processor 258, transmit processor 264, controller/processor 280, and/or memory 282
  • performing the PLMN search occurs in response to determining the UE is located within an international area.
  • the PLMN may provide non-terrestrial network access.
  • the process 800 may also include determining a list of candidate PLMNs based on the search (block 804).
  • the UE e.g., using controller/processor 280, and/or memory 282 can determine the list of candidate PLMNs based on the search.
  • the identity of the serving PLMN includes a shared mobile country code (MCC).
  • the at least one identity of the candidate PLMN includes a MCC.
  • the shared MCC may be in a range of 900 to 999.
  • the process 800 may also include selecting a PLMN from among the list of candidate PLMNs in response to an identity of a serving PLMN not being a shared mobile country code (MCC).
  • MCC shared mobile country code
  • the candidate PLMNs have either an MCC the same as an identity of the serving PLMN or a shared MCC.
  • the selected PLMN has a higher priority than the serving PLMN (block 806).
  • At least one identity of the candidate PLMNs has a different mobile country code (MCC) than an identity of a serving PLMN.
  • MCC mobile country code
  • the UE e.g., using the antenna 252, DEMOD/MOD 254, MIMO detector 256, TX MIMO processor 266, receive processor 258, transmit processor 264, controller/processor 280, and/or memory 282
  • the selecting of the PLMN is from a list dedicated to international area searching.
  • the selecting of the PLMN is based on an indication that the PLMN is eligible for selection in an international area.
  • the list of candidate PLMNs may include candidate PLMNs with either the shared MCC or an MCC corresponding to a country where the UE is located, when the identity of the serving PLMN comprises the shared MCC.
  • FIGURE 9 is a flow diagram illustrating an example process 900 performed, for example, by a UE, in accordance with various aspects of the present disclosure.
  • the example process 900 is an example of wireless network selection for satellite access in international areas.
  • the process 900 may include determining whether the UE transitioned between an international area and a national area (block 902).
  • the UE e.g., using the antenna 252, DEMOD/MOD 254, MIMO detector 256, TX MIMO processor 266, receive processor 258, transmit processor 264, controller/processor 280, and/or memory 282
  • the UE may determine the UE is located in the international area, and then select a PLMN from a list dedicated to international area searching.
  • the UE may determine the UE is located in the international area, and then select a PLMN based on an indication that the PLMN is eligible for selection in the international area.
  • the PLMN selection is for non-terrestrial network (NTN) access.
  • NTN non-terrestrial network
  • the process 900 may also include triggering a public land mobile network (PLMN) selection of a network for receiving service, in response to the UE having transitioned between the international area and the national area (block 904).
  • PLMN public land mobile network
  • the UE e.g., using the antenna 252, DEMOD/MOD 254, MIMO detector 256, TX MIMO processor 266, receive processor 258, transmit processor 264, controller/processor 280, and/or memory 282
  • PLMN selection e.g., using the antenna 252, DEMOD/MOD 254, MIMO detector 256, TX MIMO processor 266, receive processor 258, transmit processor 264, controller/processor 280, and/or memory 282
  • a high priority PLMN list is prioritized over a most recently registered PLMN during PLMN selection.
  • the high priority PLMN list may comprise a home public land mobile network (HPLMN) list.
  • the high priority PLMN list may comprise an equivalent home public land mobile network (EHP
  • FIGURE 10 is a flow diagram illustrating an example process 1000 performed, for example, by a UE, in accordance with various aspects of the present disclosure.
  • the example process 1000 is an example of wireless network selection for satellite access in international areas.
  • the process 1000 may include determining whether the UE is located inside an international area (block 1002).
  • the UE e.g., using the antenna 252, DEMOD/MOD 254, MIMO detector 256, TX MIMO processor 266, receive processor 258, transmit processor 264, controller/processor 280, and/or memory 282
  • the UE e.g., using the antenna 252, DEMOD/MOD 254, MIMO detector 256, TX MIMO processor 266, receive processor 258, transmit processor 264, controller/processor 280, and/or memory 282
  • the UE can determine where the UE is located.
  • the process 1000 may also include receiving, by the UE, an indication that a public land mobile network (PLMN) is eligible for selection in the international area (block 1004).
  • PLMN public land mobile network
  • the UE e.g., using the antenna 252, DEMOD/MOD 254, MIMO detector 256, receive processor 258, controller/processor 280, and/or memory 282
  • the process 1000 may also include selecting the PLMN based in the indication that the PLMN is eligible for selection in the international area (block 1006).
  • the UE e.g., using the controller/processor 280, and/or memory 282 can select the PLMN.
  • Aspect 1 A method of wireless communication by a user equipment (UE), comprising: determining whether the UE transitioned between an international area and a national area; triggering a public land mobile network (PLMN) selection of a network for receiving service, in response to the UE having transitioned between the international area and the national area.
  • PLMN public land mobile network
  • Aspect 2 The method of Aspect 1, further comprising prioritizing a high priority PLMN list over a most recently registered PLMN (RPLMN) during PLMN selection.
  • RPLMN most recently registered PLMN
  • Aspect 3 The method of Aspect 1 or 2, in which the high priority PLMN list comprises a home public land mobile network (HPLMN) list.
  • HPLMN home public land mobile network
  • Aspect 4 The method of any of preceding Aspects 1 or 2, in which the high priority PLMN list comprises an equivalent home public land mobile network (EHPLMN) list.
  • EHPLMN equivalent home public land mobile network
  • Aspect 5 The method of any of the preceding Aspects, further comprising deleting an equivalent public land mobile network list, which was received from a last serving PLMN, prior to the PLMN selection.
  • Aspect 6 The method of any of the preceding Aspects, in which performing the PLMN selection further comprises assigning a most recently registered PLMN (RPLMN) to a priority level below highest priority.
  • RPLMN most recently registered PLMN
  • Aspect 7 The method of any of the preceding Aspects, in which performing the PLMN selection further comprises selecting a PLMN with a higher priority than a most recently registered PLMN (RPLMN).
  • RPLMN most recently registered PLMN
  • Aspect 8 The method of any of the preceding Aspects, in which the PLMN selection is for non-terrestrial network (NTN) access.
  • NTN non-terrestrial network
  • Aspect 9 The method of any of the preceding Aspects, in which the PLMN selection selects a most recently registered PLMN (RPLMN), when available, before selecting from an ordered list of PLMNs.
  • RPLMN most recently registered PLMN
  • Aspect 10 The method of any of preceding Aspects 1-8, in which the PLMN selection selects from a list generated during a high priority PLMN scan.
  • Aspect 11 The method of any of the preceding Aspects, in which the PLMN selection is based on a PLMN selection procedure defined for either power up or recovery from lack of coverage.
  • Aspect 12 The method of any of preceding Aspects 1-10, in which the PLMN selection is based on a PLMN selection procedure that occurs upon completing a periodic search for a higher priority PLMN.
  • a method of wireless communication by a user equipment comprising: performing a public land mobile network (PLMN) search for a higher priority PLMN; determining a list of candidate PLMNs based on the search; and selecting a PLMN from among the list of candidate PLMNs in response to an identity of a serving PLMN not being a shared mobile country code (MCC), the candidate PLMNs having either an MCC the same as the identity of the serving PLMN or the shared MCC, the selected PLMN having a higher priority than the serving PLMN.
  • PLMN public land mobile network
  • MCC shared mobile country code
  • Aspect 14 The method of Aspect 13, in which the list of candidate PLMNs includes candidate PLMNs with either the shared MCC or an MCC corresponding to a country where the UE is located, when the identity of the serving PLMN comprises the shared MCC.
  • Aspect 15 The method of Aspect 13 or 14, further comprising initiating a registration procedure with the selected PLMN.
  • Aspect 16 The method of any of the Aspects 13-15, in which performing the PLMN search occurs in response to determining the UE is located within an international area.
  • Aspect 17 The method of any of the Aspects 13-16, in which the identity of the serving PLMN includes the shared MCC.
  • Aspect 18 The method of any of the Aspects 13-17, in which an identity of at least one of the candidate PLMNs includes the shared MCC.
  • Aspect 19 The method of any of the Aspects 13-18, in which the shared MCC is in a range of 900 to 999.
  • Aspect 20 The method of any of the Aspects 13-19, in which at least one of the candidate PLMNs provides non-terrestrial network access.
  • Aspect 21 The method of any of the Aspects 13-20, further comprising selecting the PLMN based on an indication that the PLMN is eligible for selection in an international area.
  • Aspect 22 An apparatus for wireless communication by a user equipment (UE), comprising: a memory; and at least one processor coupled to the memory, the at least one processor configured: to determine whether the UE transitioned between an international area and a national area; and to trigger a public land mobile network (PLMN) selection of a network for receiving service, in response to the UE having transitioned between the international area and the national area.
  • PLMN public land mobile network
  • Aspect 23 The apparatus of Aspect 22, in which the at least one processor is further configured to perform the PLMN selection by assigning a most recently registered PLMN (RPLMN) to a priority level below highest priority.
  • RPLMN most recently registered PLMN
  • Aspect 24 The apparatus of any of the Aspects 22 or 23, in which the at least one processor is further configured to perform the PLMN selection further comprises selecting a PLMN with a higher priority than a most recently registered PLMN (RPLMN).
  • RPLMN most recently registered PLMN
  • Aspect 25 The apparatus of any of the Aspects 22-24, in which the PLMN selection is for non-terrestrial network (NTN) access.
  • NTN non-terrestrial network
  • Aspect 26 The apparatus of any of the Aspects 22-25 in which the PLMN selection is based on a PLMN selection procedure defined for either power up or recovery from lack of coverage.
  • Aspect 27 The apparatus of any of the Aspects 22-26 in which the PLMN selection is based on a PLMN selection procedure that occurs upon completing a periodic search for a higher priority PLMN.
  • Aspect 28 An apparatus for wireless communication by a user equipment (UE), comprising: a memory; and at least one processor coupled to the memory, the at least one processor configured: to perform a public land mobile network (PLMN) search for a higher priority PLMN; to determine a list of candidate PLMNs based on the search; and to select a PLMN from among the list of candidate PLMNs in response to an identity of a serving PLMN not being a shared mobile country code (MCC), the candidate PLMNs having either an MCC the same as the identity of the serving PLMN or the shared MCC, the selected PLMN having a higher priority than the serving PLMN.
  • PLMN public land mobile network
  • MCC shared mobile country code
  • Aspect 29 The apparatus of Aspect 28, in which the list of candidate PLMNs includes candidate PLMNs with either the shared MCC or an MCC corresponding to a country where the UE is located, when the identity of the serving PLMN comprises the shared MCC.
  • Aspect 30 The apparatus of Aspect 28 or 29, in which at least one of the candidate PLMNs provides non-terrestrial network access.
  • the term “component” is intended to be broadly construed as hardware, firmware, and/or a combination of hardware and software.
  • a processor is implemented in hardware, firmware, and/or a combination of hardware and software.
  • satisfying a threshold may, depending on the context, refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, and/or the like.
  • a phrase referring to “at least one of’ a list of items refers to any combination of those items, including single members.
  • “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c- c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c).

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Abstract

Un procédé de communication sans fil par un équipement utilisateur (UE) comprend la détermination si l'UE effectue une transition entre une zone internationale et une zone nationale. Le procédé comprend également le déclenchement d'une sélection de réseau mobile terrestre public (PLMN) d'un réseau pour recevoir un service, en réponse à la transition de l'UE entre la zone internationale et la zone nationale. Un procédé de communication sans fil par un UE comprend la réalisation d'une recherche PLMN pour un PLMN à priorité supérieure. Le procédé comprend aussi la détermination d'une liste de PLMN candidats sur la base de la recherche. Le procédé comprend en outre la sélection d'un PLMN parmi la liste de PLMN candidats en réponse à une identité d'un PLMN de desserte qui n'est pas un indicatif mobile de pays partagé (MCC). Les PLMN candidats ont soit un MCC, le même que l'identité du PLMN de desserte soit un MCC partagé. Le PLMN sélectionné a une priorité plus élevée que le PLMN de desserte.
PCT/US2022/045585 2021-10-29 2022-10-03 Sélection de réseau sans fil dans des zones internationales WO2023075994A1 (fr)

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CN202280071153.8A CN118140532A (zh) 2021-10-29 2022-10-03 国际区域中的无线网络选择
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Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
"3rd Generation Partnership Project; Technical Specification Group Core Network and Terminals; Non-Access-Stratum (NAS) functions related to Mobile Station (MS) in idle mode (Release 17)", vol. CT WG1, no. V17.4.0, 24 September 2021 (2021-09-24), pages 1 - 107, XP052056711, Retrieved from the Internet <URL:https://ftp.3gpp.org/Specs/archive/23_series/23.122/23122-h40.zip 23122-h40.docx> [retrieved on 20210924] *
"3rd Generation Partnership Project; Technical Specification Group Core Network and Terminals; Study on PLMN selection for satellite access (Release 17)", no. V17.0.0, 25 September 2021 (2021-09-25), pages 1 - 48, XP052056827, Retrieved from the Internet <URL:https://ftp.3gpp.org/Specs/archive/24_series/24.821/24821-h00.zip 24821-h00.docx> [retrieved on 20210925] *
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