WO2022101021A1 - Sélection de cellule pour dispositifs à sim multiples - Google Patents

Sélection de cellule pour dispositifs à sim multiples Download PDF

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Publication number
WO2022101021A1
WO2022101021A1 PCT/EP2021/079938 EP2021079938W WO2022101021A1 WO 2022101021 A1 WO2022101021 A1 WO 2022101021A1 EP 2021079938 W EP2021079938 W EP 2021079938W WO 2022101021 A1 WO2022101021 A1 WO 2022101021A1
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WO
WIPO (PCT)
Prior art keywords
user equipment
sim
priority information
message
cell reselection
Prior art date
Application number
PCT/EP2021/079938
Other languages
English (en)
Inventor
Alessio Casati
Srinivasan Selvaganapathy
Amaanat ALI
Faranaz SABOURI-SICHANI
Original Assignee
Nokia Technologies Oy
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
Application filed by Nokia Technologies Oy filed Critical Nokia Technologies Oy
Publication of WO2022101021A1 publication Critical patent/WO2022101021A1/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
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/60—Subscription-based services using application servers or record carriers, e.g. SIM application toolkits
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
    • H04W8/183—Processing at user equipment or user record carrier
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • Various example embodiments relate to telecommunication systems, and more particularly to cell selection for multi SIM devices.
  • 5G refers to a new generation of radio systems and network architecture. 5G is expected to provide higher bitrates and coverage than the current long term evolution (LTE) systems. 5G enables communication for multi-SIM devices. However, the multi- SIM capability may relatively be complex, in particular, it may require an improved connection control for the multi-SIM devices.
  • LTE long term evolution
  • Example embodiments provide an apparatus comprising: one or more processors configured to couple to: a transmitter and a receiver of the apparatus; multiple subscriber identity modules (SIMs) of the apparatus; wherein the apparatus is configured to: receive, using a first SIM of the multiple subscriber identity modules, from a base station a message, the message comprising cell reselection priority information; perform using the first SIM a cell selection based on said cell reselection priority information, the cell being selected for the multiple subscriber identity modules so that the apparatus may camp with the subscriber identity modules on said cell.
  • SIMs subscriber identity modules
  • Example embodiments provide an apparatus comprising: one or more processors configured to couple to: a transmitter and a receiver of the apparatus; multiple subscriber identity modules (SIMs) of the apparatus; wherein the apparatus is configured to: receive, using a first SIM of the multiple subscriber identity modules, from a base station a message, the message comprising cell reselection priority information; perform using the first SIM a cell selection based on said cell reselection priority information, the cell being selected for the multiple subscriber identity modules which have selected the same Public Land Mobile Network (PLMN).
  • SIMs subscriber identity modules
  • the multiple subscriber identity modules comprise at least the first SIM and at least a second SIM, wherein the selected PLMN is: a home PLMN for the first and second SIMs; or a home PLMN for the first SIM and visited PLMN for the second SIM.
  • Example embodiments provide an apparatus comprising means configured to: receive, using a first SIM of multiple subscriber identity modules of the apparatus, from a base station a message, the message comprising cell reselection priority information; perform using the first SIM a cell selection based on said cell reselection priority information, the cell being selected for the multiple subscriber identity modules which have selected the same Public Land Mobile Network (PLMN).
  • the means of the apparatus comprises at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code being configured to, with the at least one processor, cause the performance of the apparatus.
  • Example embodiments provide a base station comprising means being configured for sending a message to a user equipment , the message being associated to a first SIM of multiple SIMs of the user equipment, the message comprising cell reselection priority information; receiving, from the user equipment, reports associated to the SIMs respectively, the report comprising said cell reselection priority information and a timestamp, the timestamp indicating the time of reception of the message comprising cell reselection priority information at the user equipment; sending to a core network a context release complete message comprising said cell reselection priority information and the timestamp.
  • Example embodiments provide core network node comprising means being configured to: receive from a base station a context release complete message comprising cell reselection priority information and a timestamp, the timestamp indicating the time at which the cell reselection priority information is received from the base station at a user equipment using a SIM of multiple subscriber identity modules of the user equipment; send a paging message to the base station for each SIM of the user equipment, the paging message comprising the cell reselection priority information, wherein the paging message is sent if the time since the timestamp is shorter than the duration of a timer included with the cell reselection priority information received from the base station.
  • the means of the base station comprises at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code being configured to, with the at least one processor, cause the performance of the base station.
  • the means of the core network node comprises at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code being configured to, with the at least one processor, cause the performance of the core network node.
  • Example embodiments provide a method comprising: receiving at a user equipment, using a first SIM of the user equipment, from a base station a message, the message comprising cell reselection priority information; performing using the first SIM a cell selection based on said cell reselection priority information, the cell being selected for multiple SIMs of the user equipment so that the user equipment may camp with the SIMs on said cell.
  • Example embodiments provide a method comprising sending a message to a user equipment, the message being associated to a first SIM of multiple SIMs of the user equipment, the message comprising cell reselection priority information; receiving, from the user equipment, reports associated to the SIMs respectively, the report comprising said cell reselection priority information and a timestamp, the timestamp indicating the time of reception of the message comprising cell reselection priority information at the user equipment; sending to a core network a context release complete message comprising said cell reselection priority information and the timestamp.
  • Example embodiments provide a method comprising: receiving from a base station a context release complete message comprising cell reselection priority information and a timestamp, the timestamp indicating the time at which the cell reselection priority information is received from the base station at a user equipment using a SIM of multiple SIMs of the user equipment; sending a paging message to the base station for each SIM of the user equipment, the paging message comprising the cell reselection priority information, wherein the paging message is sent if the time since the timestamp is shorter than the duration of a timer included with the cell reselection priority information received from the base station.
  • Example embodiments provide a computer program comprising instructions for causing an apparatus for performing at least the following: receiving at a user equipment using a first SIM of the user equipment from a base station a message, the message comprising cell reselection priority information; performing using the first SIM a cell selection based on said cell reselection priority information, the cell being selected for multiple SIMs of the user equipment so that the apparatus may camp with the SIMs on said cell.
  • Example embodiments provide a computer program comprising instructions for causing an apparatus for performing at least the following: sending a message to a user equipment, the message being associated to a first SIM of multiple SIMs of the user equipment, the message comprising cell reselection priority information; receiving, from the user equipment, reports associated to the SIMs respectively, the report comprising said cell reselection priority information and a timestamp, the timestamp indicating the time of reception of the RRC connection release message; sending to a core network a context release complete message comprising said cell reselection priority information and the timestamp.
  • Example embodiments provide a computer program comprising instructions for causing an apparatus for performing at least the following: receiving from a base station a context release complete message comprising cell reselection priority information and a timestamp, the timestamp indicating the time at which the cell reselection priority information is received from the base station at a user equipment using a SIM of multiple SIMs of the user equipment; sending a paging message to the base station for each SIM of the user equipment, the paging comprising the cell reselection priority information, wherein the paging message is sent if the time since the timestamp is shorter than the duration of a timer included with the cell reselection priority information received from the base station.
  • FIG.1 illustrates a part of an exemplifying radio access network
  • FIG. 2 is a schematic illustration of a wireless communication system
  • FIG. 3 is a flowchart of a method used in a user equipment according to an example of the present subject matter
  • FIG. 4 is a flowchart of a method used in a user equipment according to an example of the present subject matter
  • FIG. 5 is a flowchart of a method used in a base station according to an example of the present subject matter
  • FIG. 6 is a flowchart of a method used in a core network according to an example of the present subject matter
  • FIG. 7 is a flowchart of a method used in a user equipment according to an example of the present subject matter
  • FIG. 8 is a flowchart of a method used in a base station according to an example of the present subject matter
  • FIG. 9 is a flowchart of a method used in a core network according to an example of the present subject matter
  • FIG. 10 illustrates an example of messages exchanged between a user equipment, a RAN and a core network in accordance with an example of the present subject matter
  • FIG. 11 illustrates an example of messages exchanged between a user equipment, a RAN and a core network in accordance with an example of the present subject matter
  • FIG. 12 illustrates an example of messages exchanged between a user equipment and a RAN in accordance with an example of the present subject matter
  • FIG. 13 illustrates an example of messages exchanged between a user equipment and a RAN in accordance with an example of the present subject matter
  • FIG. 14 illustrates an example of messages exchanged between a user equipment, a RAN and a core network in accordance with an example of the present subject matter
  • FIG. 15 is a flowchart of a method used in a single SIM user equipment according to an example of the present subject matter
  • FIG. 16 is a block diagram showing an example of an apparatus according to an example of the present subject matter.
  • a communication system may be provided.
  • the communication system may support one or more radio access technologies (RATs).
  • RATs radio access technologies
  • a radio access technology of the radio access technologies may, for example, be evolved universal terrestrial radio access (E-LITRA) or 5G new radio (NR), but it is not limited to, as a person skilled in the art may apply the present subject matter to other communication systems provided with necessary properties.
  • E-LITRA evolved universal terrestrial radio access
  • NR 5G new radio
  • the communication system may provide telecommunication services to user equipment through one or more communication networks.
  • the communication network may, for example, be a Public Land Mobile Network (PLMN).
  • PLMN may logically be divided into a radio access network (RAN) and a core network (CN), connected via an open interface.
  • the core network may, for example, comprise an Access and Mobility Management function (AMF) or Mobility Management Entity (MME).
  • the radio access network may comprise one or more base stations.
  • the PLMN has a geographical area in which the base stations provide voice and data services to user equipment.
  • the base station of the PLMN may serve user equipment located within the base station’s geographical area of service or a cell.
  • the base station and its coverage area may collectively be referred to as a cell.
  • the base station of the PLMN may serve user equipment that have selected said PLMN.
  • the user equipment is configured to employ multiple subscriptions. Accordingly, the user equipment may include two or more subscription modules SIM 1 ,SIM 2 ...SIM N , where N > 2.
  • the subscription modules may, for example, be Universal Subscriber Identity Modules.
  • the subscription modules SIM 1 ,SIM 2 ...SIM N may be associated with a different service subscription, different network access over the same or different network type, and/or use the same or different radio access technologies.
  • two or more subscription modules of the user equipment may be subscribed to different or same PLMN operators in the communication system. For example, after selecting the PLMN, the user equipment may select a cell in the PLMN to camp on. After camping on the cell, the user equipment may monitor system information, perform measurements on the serving cell and neighboring cells, and select a better cell to camp on based on cell reselection criteria.
  • the user equipment may be configured to select for all the subscription modules the same communication network e.g. a same PLMN. That selected PLMN may comprise one or more base stations e.g. it may comprise base stations and BS 2 and a core network node e.g. CN1.
  • the user equipment may be camping with all subscription modules on the same serving base station e.g. BS X of said PLMN, or it may be camping on different serving base stations e.g. BS X and BS 2 of said PLMN.
  • the user equipment includes a wireless transceiver circuitry and one or more processors coupled to the wireless transceiver circuitry and the subscription modules SIM 1 ,SIM 2 ... SIM N .
  • the wireless transceiver circuitry includes at least one receiver and at least one transmitter.
  • the receiver circuit may be configured as a single-band receiver configured to demodulate signals for only a single frequency at a given moment in time.
  • the subscription modules SIM 1 ,SIM 2 ...SIM N may share the receiver circuit by receiving transmissions for one subscription at a time. That is, at any given moment in time, only one subscription module may receive communications via the receiver circuit.
  • the multiple subscriptions may divide access to the receiver circuit in any manner commonly known for sharing a receiver circuit among a plurality of subscription modules.
  • Each subscription module in the user equipment may represent an independent user equipment from a network point of view.
  • the user equipment may not independently access or monitor paging for two or more subscription modules if it is not configured according to the present subject matter.
  • the user equipment may suffer from overlap of paging occasions and may need to abandon one PLMN to attend to procedures on another PLMN if it is not configured according to the present subject matter.
  • the user equipment is described as having two subscription modules named a first SIM and second SIM.
  • the user equipment is configured to receive from a base station BS X using the first SIM a message.
  • the base station BS X may be the serving base station of at least the first SIM.
  • the base station BS X may be the base station of the PLMN that has been commonly selected for the first SIM and second SIM.
  • the first SIM may, for example, be the subscription module that has first received such message from the base station BS 1 .
  • the message comprises cell reselection priority information.
  • the cell reselection priority information may be the value of the RRC information element cellReselectionPriorities.
  • the message may, for example, be a system information block (SIB) or a radio resource control (RRC) connection release message.
  • SIB system information block
  • RRC radio resource control
  • the system information block comprises the cellReselectionPriorities which is not specific for the user equipment
  • the RRC connection release message comprises the cellReselectionPriorities which is specific for the first SIM of the user equipment.
  • the cell reselection priority information received in the SIB may be named CPO and the cell reselection priority information received in the RRC connection release message may be named CPI.
  • the user equipment may perform using the first SIM a cell selection for all subscription modules ...SIM N of the user equipment based on said cell reselection priority information CPO obtained from the SIB or based on CPI obtained from the RRC connection release message.
  • the user equipment may, for example, use the cell reselection priority information CPO of the SIB in case it received a RRC connection release message which does not comprise the cell reselection priority information CPI.
  • the present subject matter may be advantageous because the user equipment may run a single cell selection and reselection algorithm (instead of multiple ones) for all subscription modules so the user equipment may camp on the same cell for each of the subscription modules S/M ⁇ S/AP, ...SIM N .
  • the cell reselection priority information CPI which is specific to the first SIM may be effective or valid for a predetermined time period. That is, the cell reselection priority information which is received in the RRC connection release message may only be used by the user equipment during the predetermined time period. Beyond that predetermined time period, the user equipment may perform the cell selection using the cell reselection priority information CPO received in the SIB.
  • the time period may, for example, be defined by a timer such as the timer T320.
  • the cell selection may be performed using the cell reselection priority information CPO of the SIB if the timer has expired; otherwise, the cell reselection priority information CPI of the RRC connection release message may be used for the cell selection.
  • the user equipment may have a first connection state associated with the first SIM and a second connection state associated with the second SIM.
  • the first connection state may, for example, be a connected state or non-connected state.
  • the connected state may, for example, be the RRC CONNECTED state.
  • the non-connected state may, for example, indicate a RRC IDLE state or a transition between the RRC CONNECTED state and the IDLE state.
  • the first connection state of the user equipment may be the non-connected state at the time of receiving a RRC connection release message by the user equipment using the first SIM.
  • the second connection state of the user equipment may be the non-connected state.
  • each of the first connection state and the second connection state of the user equipment is the non-connected state.
  • the user equipment may further be configured to report back to the base station the received cell reselection priority information CPI during the predefined time period.
  • the user equipment may send a report to the base station BS X comprising the cell reselection priority information CPI and a timestamp TO indicating the time of reception of the RRC connection release message at the user equipment.
  • This report may be sent using the first SIM and the second SIM of the user equipment. For that, for each subscription module of the first SIM and second SIM, the user equipment may send the same report to the base station BS X when the state of the user equipment associated with said subscription module becomes the connected state.
  • the connection state of the user equipment associated with a SIM may become connected sate during the RRC connection establishment or during RRC connection resume for that SIM.
  • the user equipment may be configured to repeat the cell selection and the reporting during the predefined time period. For example, the user equipment may check if the time T320 has expired and if not, it repeats the cell selection and the reporting using the cell reselection priority information CPI.
  • the base station BS1 may further be configured to send to the core network CN1 a context release complete message comprising said cell reselection priority information CPI and the timestamp TO e.g. and the timer T320.
  • the base station BS1 may report cell reselection priority information CPI and the timestamp TO to the core network CN1 in a context release complete message whenever it has received said cell reselection priority information CPI.
  • This cell reselection priority information CPI may be stored as paging assistance information in the core network CN1.
  • the base station BS1 may receive during that time period (e.g. if the timer T320 is not expired) from the core network CN1 a paging message for the user equipment.
  • the paging message comprises said cell reselection priority information CPI.
  • the base station BS1 may page the user equipment using the said cell reselection priority information CPI.
  • the base station BS1 may be configured to erase any received cell reselection priority information CPI and may then provide locally decided CP2 to the user equipment and core network CN1 thereafter e.g. at RRC connection release time.
  • the core network CN1 may erase CPI in case the timer T320 expires.
  • the present subject matter may, for example, enable a UE that has multiple USIMs to operate a cell selection according to the following features:
  • the UE may apply a single cell selection in idle mode for all USIMs based on Non UE -specific cellReselectionPriorities the UE receives in SIB.
  • the UE may apply a single cell selection in idle mode for all USIMs based on this received information and share this information with the RAN when any USIM becomes connected (during RRC connection establishment or RRC connection resume).
  • the reason why all other USIMs may need to provide this information is that the RAN, if the cellReselectionPriorities they obtain are still valid at that time, can then provide to the AMF the cellReselectionPriorities for the AMF/MME to then include (if T320 is still valid) in the Assistance data for Paging.
  • a RAN node may avoid assigning a locally decided UE-specific cellReselectionPriorities for this IISIM when it releases the RRC connection for this IISIM (so it may avoid bringing a IISIM out of sync with the others for cell selection purposes).
  • the UE-specific cellReselectionPriorities also passes a timestamp of when the UE has received the information.
  • the timestamp and T320 is also passed in NG message from RAN to AMF or S1 -AP message from RAN to MME as the MME will not have to read the content of the UE-specific cellReselectionPriorities (the AMF and MME handle this transparently).
  • FIG.1 depicts examples of simplified system architectures only showing some elements and functional entities, all being logical units, whose implementation may differ from what is shown.
  • the connections shown in FIG.1 are logical connections; the actual physical connections may be different. It is apparent to a person skilled in the art that the system typically comprises also other functions and structures than those shown in FIG.1 .
  • FIG.1 shows a part of an exemplifying radio access network.
  • FIG.1 shows devices 10 and 12.
  • the devices 10 and 12 may, for example, be user devices.
  • the devices 10 and 12 are configured to be in a wireless connection on one or more communication channels with a node 14.
  • the node 14 is further connected to a core network 20.
  • the node 14 may be an access node (such as (eZg)NodeB) 14 providing or serving devices in a cell.
  • the node 14 may be a non-3GPP access node.
  • the physical link from a device to a (eZg)NodeB is called uplink or reverse link and the physical link from the (eZg)NodeB to the device is called downlink or forward link.
  • (eZg)NodeBs or their functionalities may be implemented by using any node, host, server or access point etc. entity suitable for such a usage.
  • a communications system typically comprises more than one (eZg)NodeB in which case the (eZg)NodeBs may also be configured to communicate with one another over links, wired or wireless, designed for the purpose. These links may be used for signaling purposes.
  • the (eZg)NodeB is a computing device configured to control the radio resources of communication system it is coupled to.
  • the NodeB may also be referred to as a base station, an access point or any other type of interfacing device including a relay station capable of operating in a wireless environment.
  • the (eZg)NodeB includes or is coupled to transceivers. From the transceivers of the (eZg)NodeB, a connection is provided to an antenna unit that establishes bi-directional radio links to devices.
  • the antenna unit may comprise a plurality of antennas or antenna elements.
  • the (eZg)NodeB is further connected to the core network 20 (CN or next generation core NGC).
  • the (eZg)NodeB may connect to an access and mobility management function (AMF) and user plane function (UPF) in the control plane and user plane, respectively.
  • AMF access and mobility management function
  • UPF user plane function
  • the counterpart on the CN side can be a serving gateway (S-GW, routing and forwarding user data packets), packet data network gateway (P-GW), for providing connectivity of devices (UEs) to external packet data networks, or mobile management entity (MME), etc.
  • S-GW serving gateway
  • P-GW packet data network gateway
  • MME mobile management entity
  • the device also called user device, UE, user equipment, user terminal, terminal device, etc.
  • the device illustrates one type of an apparatus to which resources on the air interface are allocated and assigned, and thus any feature described herein with a device may be implemented with a corresponding apparatus, such as a relay node.
  • a relay node is a layer 3 relay (self-backhauling relay) towards the base station.
  • the device typically refers to a device (e.g. a portable or non-portable computing device) that includes wireless mobile communication devices operating with or without a subscriber identification module (SIM), including, but not limited to, the following types of devices: a mobile station (mobile phone), smartphone, personal digital assistant (PDA), handset, device using a wireless modem (alarm or measurement device, etc.), laptop and/or touch screen computer, tablet, game console, notebook, and multimedia device.
  • SIM subscriber identification module
  • a mobile station mobile phone
  • smartphone personal digital assistant
  • PDA personal digital assistant
  • handset device using a wireless modem (alarm or measurement device, etc.)
  • laptop and/or touch screen computer tablet, game console, notebook, and multimedia device.
  • a device may also be a nearly exclusive uplink only device, of which an example is a camera or video camera loading images or video clips to a network.
  • a device may also be a device having capability to operate in Internet of Things (loT) network which is a scenario in which objects are provided with the ability to transfer data over a network without requiring human-to- human or human-to-computer interaction, e.g. to be used in smart power grids and connected vehicles.
  • the device may also utilize cloud.
  • a device may comprise a user portable device with radio parts (such as a watch, earphones or eyeglasses) and the computation is carried out in the cloud.
  • the device (or in some embodiments a layer 3 relay node) is configured to perform one or more of user equipment functionalities.
  • the device may also be called a subscriber unit, mobile station, remote terminal, access terminal, user terminal or user equipment (UE) just to mention but a few names or apparatuses.
  • CPS cyber-physical system
  • ICT devices sensors, actuators, processors microcontrollers, etc.
  • Mobile cyber physical systems in which the physical system in question has inherent mobility, are a subcategory of cyber-physical systems. Examples of mobile physical systems include mobile robotics and electronics transported by humans or animals.
  • 5G enables using multiple input - multiple output (MIMO) antennas, many more base stations or nodes than an existing LTE system (a so-called small cell concept), including macro sites operating in co-operation with smaller stations and employing a variety of radio technologies depending on service needs, use cases and/or spectrum available.
  • MIMO multiple input - multiple output
  • 5G mobile communications supports a wide range of use cases and related applications including video streaming, augmented reality, different ways of data sharing and various forms of machine type applications (such as (massive) machinetype communications (mMTC), including vehicular safety, different sensors and realtime control.
  • mMTC massive machinetype communications
  • 5G is expected to have multiple radio interfaces, namely below 6GHz, cmWave and mmWave, and also being integrable with existing legacy radio access technologies, such as the LTE. Integration with the LTE may be implemented, at least in the early phase, as a system, where macro coverage is provided by the LTE and 5G radio interface access comes from small cells by aggregation to the LTE. In other words, 5G is planned to support both inter-RAT operability (such as LTE-5G) and inter- Rl operability (inter-radio interface operability, such as below 6GHz - cmWave, below 6GHz - cmWave - mmWave).
  • inter-RAT operability such as LTE-5G
  • inter- Rl operability inter-radio interface operability, such as below 6GHz - cmWave, below 6GHz - cmWave - mmWave.
  • One of the concepts considered to be used in 5G networks is network slicing in which multiple independent and dedicated virtual subnetworks
  • the current architecture in LTE networks is fully distributed in the radio and fully centralized in the core network.
  • the low latency applications and services in 5G require to bring the content close to the radio which leads to local break out and multi-access edge computing (MEC).
  • MEC multi-access edge computing
  • 5G enables analytics and knowledge generation to occur at the source of the data. This approach requires leveraging resources that may not be continuously connected to a network such as laptops, smartphones, tablets and sensors.
  • MEC provides a distributed computing environment for application and service hosting. It also has the ability to store and process content in close proximity to cellular subscribers for faster response time.
  • Edge computing covers a wide range of technologies such as wireless sensor networks, mobile data acquisition, mobile signature analysis, cooperative distributed peer-to-peer ad hoc networking and processing also classifiable as local cloud/fog computing and grid/mesh computing, dew computing, mobile edge computing, cloudlet, distributed data storage and retrieval, autonomic self-healing networks, remote cloud services, augmented and virtual reality, data caching, Internet of Things (massive connectivity and/or latency critical), critical communications (autonomous vehicles, traffic safety, real-time analytics, time-critical control, healthcare applications).
  • the communication system is also able to communicate with other networks, such as a public switched telephone network or the Internet as illustrated by the component referenced by reference numeral 22, or utilize services provided by them.
  • the communication network may also be able to support the usage of cloud services, for example at least part of core network operations may be carried out as a cloud service (this is depicted in FIG.1 by “cloud” 24).
  • the communication system may also comprise a central control entity, or a like, providing facilities for networks of different operators to cooperate for example in spectrum sharing.
  • Edge cloud may be brought into a radio access network (RAN) by utilizing network function virtualization (NVF) and software defined networking (SDN).
  • RAN radio access network
  • NVF network function virtualization
  • SDN software defined networking
  • Using the technology of edge cloud may mean access node operations to be carried out, at least partly, in a server, host or node operationally coupled to a remote radio head or base station comprising radio parts. It is also possible that node operations will be distributed among a plurality of servers, nodes or hosts.
  • Application of cloudRAN architecture enables RAN real time functions being carried out at the RAN side (in a distributed unit, DU 14) and non-real time functions being carried out in a centralized manner (in a centralized unit, CU 18).
  • 5G is being designed to support multiple hierarchies, where MEC servers can be placed between the core and the base station or nodeB (gNB). It should be appreciated that MEC can be applied in 4G networks as well.
  • 5G may also utilize satellite communication to enhance or complement the coverage of 5G service, for example by providing backhauling.
  • Possible use cases are providing service continuity for machine-to-machine (M2M) or Internet of Things (loT) devices or for passengers on board of vehicles, or ensuring service availability for critical communications, and future railway/maritime/aeronautical communications.
  • Satellite communication may utilize geostationary earth orbit (GEO) satellite systems, but also low earth orbit (LEO) satellite systems, in particular mega-constellations (systems in which hundreds of (nano)satellites are deployed).
  • GEO geostationary earth orbit
  • LEO low earth orbit
  • mega-constellations systems in which hundreds of (nano)satellites are deployed.
  • Each satellite 16 in the megaconstellation may cover several satellite-enabled network entities that create on- ground cells.
  • the on-ground cells may be created via an on-ground relay node 14 or by a gNB located on-ground or in a satellite.
  • the depicted system is only an example of a part of a radio access system and in practice, the system may comprise a plurality of (eZg)NodeBs, the device may have an access to a plurality of radio cells and the system may comprise also other apparatuses, such as physical layer relay nodes or other network elements, etc.
  • a plurality of different kinds of radio cells as well as a plurality of radio cells may be provided.
  • Radio cells may be macro cells (or umbrella cells) which are large cells, usually having a diameter of up to tens of kilometers, or smaller cells such as micro-, femto- or picocells.
  • the (eZg)NodeBs of FIG.1 may provide any kind of these cells.
  • a cellular radio system may be implemented as a multilayer network including several kinds of cells. Typically, in multilayer networks, one access node provides one kind of a cell or cells, and thus a plurality of (eZg)NodeBs are required to provide such a network structure.
  • a network which is able to use “plug-and-play” (eZg)Node Bs includes, in addition to Home (eZg)NodeBs (H(eZg)nodeBs), a home node B gateway, or HNB-GW (not shown in FIG.1 ).
  • HNB-GW HNB Gateway
  • a HNB Gateway (HNB-GW) which is typically installed within an operator’s network may aggregate traffic from a large number of HNBs back to a core network.
  • FIG. 2 is a schematic illustration of a wireless communication system 200 in accordance with an example of the present subject matter.
  • the communication system 200 comprises a user equipment 201 within the coverage area of one or more PLMNs of the communication system 200.
  • the user equipment 201 may be a multi-SIM mobile device.
  • the user equipment 201 may comprise a first SIM (SIM1 ) and a second SIM (SIM2), but it is not limited to two SIMs.
  • SIM1 SIM
  • SIM2 SIM
  • the user equipment 201 has one RF transceiver associated with the first SIM and the second SIM e.g. the user equipment 201 is equipped with a single Rx I Single Tx.
  • the user equipment 201 may be capable of receiving traffic from one network and and/or transmitting traffic to one network at a time.
  • the communication system 200 includes a plurality of PLMNs provided by a plurality of network operators (PLMN operators).
  • PLMN operators For simplicity of understanding, FIG. 2 depicts only PLMN 202a, PLMN 202b, and PLMN 202c.
  • Each of the PLMNs 202a, 202b, and 202c is capable of providing service to the user equipment 201 via one or more base stations of the PLMN.
  • the base station may, for example, be a gNB as described with reference to FIG. 1.
  • the PLMN 202a is shown as containing two base stations BS1 and BS2
  • the PLMN 202b is shown as containing base station BS3
  • the PLMN 202c is shown as containing base station BS4.
  • the first SIM of the user equipment 201 is subscribed with PLMN 202a and the second SIM of the user equipment 201 is subscribed with PLMN 202b.
  • PLMN 202a may be the HPLMN of the first SIM and the PLMN 202b may be the HPLMN of the second SIM.
  • the first and second SIMs may be subscribed with the same PLMN.
  • the user equipment 201 may have a first connection state associated with the first SIM and a second connection state associated with the second SIM.
  • the user equipment 201 may be configured to perform a PLMN selection when the first connection state or the second connection state is the non-connected state.
  • the first and second SIMs attempt to camp on and then register to the last stored registered PLMN (RPLMN) corresponding to each of the first SIM and the second SIM.
  • the first and second SIMs may perform camping and registration procedures independently and then enable the first SIM and the second SIM to enter idle state.
  • the present subject matter may advantageously be performed when the first SIM and the second SIM are registered to the same PLMN e.g. 202a.
  • FIG. 3 is a flowchart of a method used in a user equipment according to an example of the present subject matter.
  • the method described in FIG 3 may be implemented in the system illustrated in FIG. 2, but is not limited to this implementation.
  • the user equipment may, for example, be the multi-SIM mobile device 201.
  • the method starts at step 301 , where the user equipment 201 receives a system information message.
  • the system information message may be received by the user equipment 201 using the first SIM and/or the second SIM.
  • the system information message may, for example, be a SIB message.
  • the system information message may comprise cell reselection priority information CP0.
  • the cell reselection priority information CP0 may, for example, be values of the RRC information element cellReselectionPriorities.
  • the cell reselection priority information CP0 may not be specific for any SIM of the user equipment 201. That is, the cell reselection priority information CP0 may be validly used by any SIM of the user equipment 201 .
  • the method Upon receiving the system information message, the method then proceeds to step 303, where the user equipment 201 performs a cell selection using a given SIM of the first and second SIMs based on the cell reselection priority information.
  • the cell is selected for both the first SIM and the second SIM.
  • the given SIM may be the first or second SIM of the user equipment via which the user equipment 201 has received the system information message.
  • the user equipment 201 may have received a connection release message before performing step 303.
  • the connection release message includes the timer T320.
  • the user equipment 201 may perform step 303 if the T320 expires.
  • FIG. 4 is a flowchart of a method used in a user equipment according to an example of the present subject matter. For the purpose of explanation, the method described in FIG 4 may be implemented in the system illustrated in FIG. 2, but is not limited to this implementation.
  • the user equipment may, for example, be the multi-SIM mobile device 201.
  • the user equipment may have both the first connection state associated with the first SIM and the second connection state associated with the second SIM being the non-connected state.
  • the first and second SIMs may have selected the same PLMN e.g. 202b comprising the base station BS3.
  • the method starts at step 401 , where the user equipment 201 receives a message using the first SIM and/or the second SIM of the user equipment 201 from the base station BS3.
  • the received message may, for example, be a system information block message or a RRC connection release message.
  • the connection release message may comprise cell reselection priority information CPI.
  • the cell reselection priority information CPI may, for example, be values of the RRC information element cellReselectionPriorities.
  • the cell reselection priority information CPI may be specific to the SIM via which the user equipment 201 received the connection release message.
  • the connection release message may, for example, include the timer T320.
  • the SIB message may comprise cell reselection priority information CP0.
  • the cell reselection priority information CP0 may, for example, be values of the RRC information element cellReselectionPriorities.
  • the cell reselection priority information CP0 may not be specific for any SIM of the user equipment 201 . That is, the cell reselection priority information CP0 may be validly used by any SIM of the user equipment 201 .
  • the method Upon receiving the message, the method then proceeds to step 403, where the user equipment 201 performs a cell selection using a given SIM of the first and second SIMs.
  • the cell selection is performed for both the first and second SIMs based on the cell reselection priority information CPI or CP0 so that the user equipment can camp on the same cell using the first SIM and second SIM.
  • the given SIM may be the SIM of the first and second SIMs of the user equipment via which the user equipment 201 has first received the message.
  • the user equipment 201 may perform steps 405 to 407 for each SIM of the first SIM and second SIM of the user equipment 201 in case the received message is the RRC connection release message.
  • the user equipment 201 may determine (inquiry step 405) if the first SIM or the second SIM of the user equipment 201 becomes connected. The determination step 405 may be repeated for a SIM if that SIM did not become connected yet. In case the user equipment 201 becomes connected using the first SIM, the method then proceeds to step 407, where the user equipment 201 reports the cell reselection priority information CPI and a timestamp TO to the base station BS3 using the first SIM. Also, in case the user equipment becomes connected using the second SIM, the method then proceeds to step 407, where the user equipment 201 reports the cell reselection priority information CPI and the timestamp TO to the base station BS3 using the second SIM.
  • the base station BS3 can then provide CPI for the AMF/MME to then include in the assistance data for paging.
  • the report may be included in a RRC connection setup complete message as shown in FIG. 12 or included in a RRC connection resume message as shown in FIG. 13.
  • steps 403 to 407 may be performed by the user equipment in case the user equipment has received in a Traffic Area Update (TAU) accept message an information indicating that the communication system supports the method enabled by steps 403 to 407.
  • TAU Traffic Area Update
  • the TAU accept message may indicate the support of the feature of single MUSIM cell selection priorities.
  • steps 403 to 407 may automatically be performed upon receiving the message of step 401 .
  • steps 403 to 407 may repeatedly be performed in case the timer T320 is not expired.
  • FIG. 5 is a flowchart of a method used in a base station according to an example of the present subject matter.
  • the method described in FIG 5 may be implemented in the system illustrated in FIG. 2, but is not limited to this implementation.
  • the user equipment may have both the first connection state associated with the first SIM and the second connection state associated with the second SIM being the non-connected state.
  • the first and second SIMs may have selected the same PLMN e.g. 202a comprising the base station BS1.
  • the base station BS1 may send in step 501 a message to the user equipment 201 .
  • the message may be a broadcasted message which is not specific to any SIM of the user equipment or a RRC connection release message that corresponds to a first SIM of the user equipment 201.
  • the broadcasted message may be a SIB message comprising cell reselection priority information CP0.
  • the RRC connection release message comprises cell reselection priority information CPI specific to the first SIM.
  • the connection release message may, for example, include the timer T320.
  • the method proceeds to step 503 where the base station BS1 receives reports from the user equipment 201 using all the SIMs of the user equipment 201.
  • Each report of the reports comprises said cell reselection priority information CPI and the timestamp TO.
  • the timestamp TO indicates the time of reception of the RRC connection release message at the user equipment 201.
  • the method proceeds to step 505 where the base station BS1 sends to the core network CN1 a context release complete message comprising said cell reselection priority information CPI and the timestamp TO.
  • step 505 may be performed in case the timer T320 is not expired.
  • FIG. 6 is a flowchart of a method used in a core network node according to an example of the present subject matter.
  • the method described in FIG 6 may be implemented in the system illustrated in FIG. 2, but is not limited to this implementation.
  • the core network node CN1 may receive in step 601 a context release complete message comprising cell reselection priority information CPI and a timestamp TO. In response to the reception of the context release complete message, the core network node CN1 may send in step 603 a paging message to the base station BS1 for each SIM of the user equipment.
  • the paging message comprises said cell reselection priority information CPI.
  • FIG. 7 is a flowchart of a method used in a user equipment according to an example of the present subject matter.
  • the method described in FIG 7 may be implemented in the system illustrated in FIG. 2, but is not limited to this implementation.
  • the user equipment 201 may use a single cell selection for all SIMs of the user equipment based on broadcasted system information.
  • the broadcasted system information may comprise cell reselection priority information.
  • the cell reselection priority information may, for example, be values of the RRC information element cellReselectionPriorities.
  • the cell reselection priority information may not be specific any SIM of the user equipment 201 .
  • the user equipment 201 may determine (inquiry step 703) if any SIM of the user equipment 201 has received a cell reselection priority information that is specific or destined for the SIM.
  • the user equipment may repeat the method steps 701 to 707 may be repeated.
  • the user equipment may use in step 705 a single selection for all SIMs of the user equipment based on the specific cell reselection priority information and provide the cell reselection priority information to the base station along with the timestamp of when the cell reselection priority information is received at the user equipment.
  • Step 705 may, for example, be performed in case the network supports the feature. The UE may know this by receiving that information in TAU accept message as described with reference to FIG. 10.
  • the user equipment 201 may determine (inquiry step 707) if the timer T320 has expired. If the timer T320 has expired, the method steps 701 to 707 may be repeated; otherwise steps 705 to 707 may be repeated.
  • FIG. 8 is a flowchart of a method used in a base station according to an example of the present subject matter.
  • the method described in FIG 8 may be implemented in the system illustrated in FIG. 2, but is not limited to this implementation.
  • the base station of the RAN may receive from the user equipment 201 a report comprising the cell reselection priority information cellReselectionPriorities that is specific to a SIM of the user equipment 201 and the timestamp at which the cellReselectionPriorities is received at the user equipment 201 .
  • the base station may determine (inquiry step 803) if the timer T320 has expired. In case the timer T320 is not expired, the base station may provide the received cellReselectionPriorities and the timestamp to the core network in a context release compete message in step 805. In case the timer T320 expires, the base station may provide locally decided cellReselectionPriorities to the core network and the user equipment in step 807.
  • FIG. 9 is a flowchart of a method used in a core network according to an example of the present subject matter.
  • the method described in FIG 9 may be implemented in the system illustrated in FIG. 2, but is not limited to this implementation.
  • the core network may receive from the base station a context release compete message.
  • the context release compete message comprises the cell reselection priority information cellReselectionPriorities that is specific to a SIM of the user equipment 201 and the timestamp at which the cellReselectionPriorities is received at the user equipment 201 .
  • the core network may determine (inquiry step 903) if the timer T320 has expired. In case the timer T320 is not expired, the core network may provide in step 905 the received cellReselectionPriorities to the base station in a N2/S1 paging message so that it can be used by the base station when paging the user equipment. In case the timer T320 expires, the core network may delete in step 907 the received cellReselectionPriorities.
  • FIG. 10 is a message sequence chart illustrating an exemplary registration process in a wireless communication system in accordance with the present subject matter.
  • the UE 1001 may initiate the Tracking Area Update (TAU) procedure by sending a TAU request (1004) to the core network 1003 via a RAN node 1002.
  • TAU request (1004)
  • the UE 1001 may receive (1005) a TAU accept message.
  • the UE 1001 is informed of the support of single MUSIM cell selection priorities.
  • the UE 1001 may be a multi-SIM device comprising at least two USIMs.
  • FIG. 11 is a message sequence chart illustrating an exemplary connection release process in a wireless communication system in accordance with the present subject matter.
  • the UE 1001 may receive (1101 ) a RRC connection release message from the RAN node 1002.
  • the RRC connection release message comprises cell reselection priority information.
  • the cell reselection priority information may be the value of the RRC information element cellReselectionPriorities.
  • the RAN node 1002 may send (1103) a UE context release complete message to the core network 1003.
  • the UE context release complete message comprises said cell reselection priority information cellReselectionPriorities, the timestamp TO and the timer T320.
  • the timestamp indicates the time of reception of the RRC connection release message at the UE 1001 .
  • FIG. 12 is a message sequence chart illustrating an exemplary connection setup process in a wireless communication system in accordance with the present subject matter.
  • the UE 1001 shares the received (1201 ) cell reselection priority information with all USIMs and uses a single cell reselection algorithm based on that.
  • a USIM establishes (1203) a RRC connection, it provides the received CellReselectionPriorities alongside the timestamp of when they were received to enable evaluation of when the timer T320 expires.
  • FIG. 13 is a message sequence chart illustrating an exemplary connection resume process in a wireless communication system in accordance with the present subject matter.
  • the UE 1001 shares the received (1301 ) cell reselection priority information while resuming in RRC Inactive.
  • UE shares the received cell reselection priority information with all USIMs if received on another USIM.
  • a USIM resumes (1303) an RRC connection it provides the received CellReselectionPriorities alongside the timestamp of when they were received to enable evaluation of when the timer T320 expires.
  • the CN 1003 provides (1401 ) the cell reselection priority as part of the Assistance Data for Paging as shown in FIG. 14.
  • the advantage of this addition in the paging message to RAN is to allow optimised paging (1403) where knowledge of the UE’s most recent cell/camer information is made available to RAN in an RRC message with updated CellReselectionPriorities.
  • FIG. 15 is a flowchart of a method used in a user equipment having a single SIM module. The method may be applied for any single SIM UE when the UE-specific CellReselectionPriorities is sent.
  • the RAN node upon releasing the UE NG/S1 connection, provides in step 1501 this information to the AMF/MME along with T320 value and a timestamp. Then, the AMF/MME stores in step 1503 this information in the UE context transparently alongside T320 and timestamp to enable assessing its validity and, if valid, this information is provided in step 1505 transparently to the RAN node when the UE is paged, as part of the Assistance data for paging.
  • the UE may reselect to a cell that is not the one the UE was using in connected mode when it receives the UE-specific CellReselectionPriorities and this can assist the RAN node that receives this information to select the cells over which to page the UE with more insight, thus saving paging resources.
  • the RAN node may not have the UE context in case the UE is in IDLE connected mode.
  • FIG. 16 a block circuit diagram illustrating a configuration of an apparatus 1770 is shown, which is configured to implement at least part of the present subject matter.
  • the apparatus 1770 shown in FIG. 16 may comprise several further elements or functions besides those described herein below, which are omitted herein for the sake of simplicity as they are not essential for the understanding.
  • the apparatus may be also another device having a similar function, such as a chipset, a chip, a module etc., which can also be part of an apparatus or attached as a separate element to the apparatus 1770, or the like.
  • the apparatus 1770 may comprise a processing function or processor 1771 , such as a central processing unit (CPU) or the like, which executes instructions given by programs or the like related to a flow control mechanism.
  • the processor 1771 may comprise one or more processing portions dedicated to specific processing as described below, or the processing may be run in a single processor. Portions for executing such specific processing may be also provided as discrete elements or within one or more further processors or processing portions, such as in one physical processor like a CPU or in several physical entities, for example.
  • Reference sign 1772 denotes transceiver or input/output (I/O) units (interfaces) connected to the processor 1771.
  • the I/O units 1772 may be used for communicating with one or more other network elements, entities, terminals or the like.
  • the I/O units 1772 may be a combined unit comprising communication equipment towards several network elements or may comprise a distributed structure with a plurality of different interfaces for different network elements.
  • Reference sign 1773 denotes a memory usable, for example, for storing data and programs to be executed by the processor 1771 and/or as a working storage of the processor 1071 .
  • the processor 1771 is configured to execute processing related to the above described subject matter.
  • the apparatus 1770 may be configured to perform at least part of the method as described in connection with any one of FIGs 3 to 16.
  • the processor 1771 is configured for: receiving at a user equipment using a first SIM of the user equipment from a base station a message, the message comprising cell reselection priority information and performing using the first SIM a cell selection based on said cell reselection priority information, the cell being selected for multiple SIMs of the user equipment.
  • the processor 1771 is configured for: sending a RRC connection release message to a user equipment using a first SIM of the user equipment, the RRC connection release message comprising cell reselection priority information; receiving reports from the user equipment using the SIMs, the report comprising said cell reselection priority information and a timestamp, the timestamp indicating the time of reception of the RRC connection release message; and sending to a core network a context release complete message comprising said cell reselection priority information and the timestamp.
  • the processor 1771 is configured for: receiving from a base station a context release complete message comprising cell reselection priority information and a timestamp, the timestamp indicating the time at which the cell reselection priority information is received from the base station at a user equipment using a SIM of multiple SIMs the user equipment; and sending a paging message to the base station for each SIM of the user equipment, the paging message comprising the cell reselection priority information.
  • aspects of the present invention may be embodied as an apparatus, method, computer program or computer program product. Accordingly, aspects of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, micro-code, etc.) or an embodiment combining software and hardware aspects that may all generally be referred to herein as a “circuit,” “module” or “system.” Furthermore, aspects of the present invention may take the form of a computer program product embodied in one or more computer readable medium(s) having computer executable code embodied thereon. A computer program comprises the computer executable code or "program instructions".
  • the computer readable medium may be a computer readable storage medium.
  • a ‘computer-readable storage medium’ as used herein encompasses any tangible storage medium which may store instructions which are executable by a processor of a computing device.
  • the computer-readable storage medium may be referred to as a computer-readable non-transitory storage medium.
  • the computer-readable storage medium may also be referred to as a tangible computer readable medium.
  • a computer-readable storage medium may also be able to store data which is able to be accessed by the processor of the computing device.
  • Computer memory or ‘memory’ is an example of a computer-readable storage medium.
  • Computer memory is any memory which is directly accessible to a processor.
  • ‘Computer storage’ or ‘storage’ is a further example of a computer-readable storage medium.
  • Computer storage is any non-volatile computer-readable storage medium. In some embodiments computer storage may also be computer memory or vice versa.
  • a ‘processor’ as used herein encompasses an electronic component which is able to execute a program or machine executable instruction or computer executable code.
  • References to the computing device comprising “a processor” should be interpreted as possibly containing more than one processor or processing core.
  • the processor may for instance be a multi-core processor.
  • a processor may also refer to a collection of processors within a single computer system or distributed amongst multiple computer systems.
  • the term computing device should also be interpreted to possibly refer to a collection or network of computing devices each comprising a processor or processors.
  • the computer executable code may be executed by multiple processors that may be within the same computing device or which may even be distributed across multiple computing devices.
  • Computer executable code may comprise machine executable instructions or a program which causes a processor to perform an aspect of the present invention.
  • Computer executable code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages and compiled into machine executable instructions.
  • the computer executable code may be in the form of a high level language or in a pre-compiled form and be used in conjunction with an interpreter which generates the machine executable instructions on the fly.
  • the program instructions can be executed on one processor or on several processors. In the case of multiple processors, they can be distributed over several different entities. Each processor could execute a portion of the instructions intended for that entity.
  • the computer program or program instructions are understood to be adapted to be executed by a processor associated or related to the respective entity.

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  • Databases & Information Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention a trait à un procédé qui consiste à recevoir, au niveau d'un équipement utilisateur, un message provenant d'une station de base au moyen d'un premier SIM de l'équipement utilisateur. Le message comprend des informations de priorité de resélection de cellule. L'équipement utilisateur met en oeuvre une sélection de cellule à l'aide du premier SIM sur la base desdites informations de priorité de resélection de cellule, la cellule étant sélectionnée pour de multiples SIM de l'équipement utilisateur.
PCT/EP2021/079938 2020-11-11 2021-10-28 Sélection de cellule pour dispositifs à sim multiples WO2022101021A1 (fr)

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US20180368099A1 (en) * 2017-06-15 2018-12-20 Qualcomm Incorporated Mitigating page collisions in dual subscriber identity module devices
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