WO2021237641A1 - Résolution de publications de groupes de cellules secondaires pour des modules d'identité d'abonné doubles - Google Patents

Résolution de publications de groupes de cellules secondaires pour des modules d'identité d'abonné doubles Download PDF

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Publication number
WO2021237641A1
WO2021237641A1 PCT/CN2020/093089 CN2020093089W WO2021237641A1 WO 2021237641 A1 WO2021237641 A1 WO 2021237641A1 CN 2020093089 W CN2020093089 W CN 2020093089W WO 2021237641 A1 WO2021237641 A1 WO 2021237641A1
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WIPO (PCT)
Prior art keywords
cell
sim
list
scg
add
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PCT/CN2020/093089
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English (en)
Inventor
Jian Li
Yuankun ZHU
Hao Zhang
Fojian ZHANG
Chaofeng HUI
Pan JIANG
Xiuqiu XIA
Dongsheng Wang
Tianya LIN
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Qualcomm Inc
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Qualcomm Inc
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Priority to PCT/CN2020/093089 priority Critical patent/WO2021237641A1/fr
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Anticipated expiration legal-status Critical
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    • 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
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/142—Reselecting a network or an air interface over the same radio air interface technology

Definitions

  • aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for resolving secondary cell group releases with dual subscriber identity modules.
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, and/or the like) .
  • multiple-access 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, single-carrier 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 communication network may include a number of base stations (BSs) that can support communication 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 communication link from the BS to the UE
  • the uplink (or reverse link) refers to the communication 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 receive point (TRP) , a New Radio (NR) BS, a 5G Node 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)
  • DFT-s-OFDM discrete Fourier transform spread OFDM
  • MIMO multiple-input multiple-output
  • a method of wireless communication may include determining, for a first subscriber identity module (SIM) registered in a non-standalone (NSA) mode, that a count of secondary cell group (SCG) releases from a first cell satisfies a count threshold, based at least in part on transmitting one or more service requests to add an SCG with the first cell, and adding, for the first SIM, the first cell to a list of one or more cells to which service requests to add the SCG are barred, based at least in part on determining that the count of SCG releases satisfies the count threshold.
  • SIM subscriber identity module
  • NSA non-standalone
  • the method may include determining, for a second SIM of the UE, that a second cell is not on the list, and transmitting, for the second SIM, a service request to the second cell to add the SCG based at least in part on the determining that the second cell is not on the list.
  • a non-transitory computer-readable medium may store one or more instructions for wireless communication that, when executed by one or more processors of a UE, may cause the UE to determine, for a first SIM registered in an NSA mode, that a count of SCG releases from a first cell satisfies a count threshold, based at least in part on transmitting one or more service requests to add an SCG with the first cell, and add, for the first SIM, the first cell to a list of one or more cells to which service requests to add the SCG are barred, based at least in part on determining that the count of SCG releases satisfies the count threshold.
  • the instructions when executed by one or more processors of a UE, may cause the UE determine, for a second SIM of the UE, that a second cell is not on the list, and transmit, for the second SIM, a service request to the second cell to add the SCG based at least in part on the determining that the second cell is not on the list.
  • a UE for wireless communication may include memory, one or more processors operatively coupled to the memory, and instructions stored in the memory.
  • the instructions in the memory may be operable, when executed by the one or more processors, to cause the UE to determine, for a first SIM registered in an NSA mode, that a count of SCG releases from a first cell satisfies a count threshold, based at least in part on transmitting one or more service requests to add an SCG with the first cell, and add, for the first SIM, the first cell to a list of one or more cells to which service requests to add the SCG are barred, based at least in part on determining that the count of SCG releases satisfies the count threshold.
  • the instructions in the memory may be operable, when executed by the one or more processors, to cause the UE to determine, for a second SIM of the UE, that a second cell is not on the list, and transmit, for the second SIM, a service request to the second cell to add the SCG based at least in part on the determining that the second cell is not on the list.
  • an apparatus for wireless communication may include means for determining, for a first SIM registered in an NSA mode, that a count of SCG releases from a first cell satisfies a count threshold, based at least in part on transmitting one or more service requests to add an SCG with the first cell, means for adding, for the first SIM, the first cell to a list of one or more cells to which service requests to add the SCG are barred, based at least in part on determining that the count of SCG releases satisfies the count threshold, means for determining, for a second SIM of the apparatus, that a second cell is not on the list, and means for transmitting, for the second SIM, a service request to the second cell to add the SCG based at least in part on the determining that the second cell is not on the list.
  • aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication device, and/or processing system as substantially described herein with reference to and as illustrated by the drawings and specification.
  • Fig. 1 is a block diagram conceptually illustrating an example of a wireless communication network, in accordance with various aspects of the present disclosure.
  • Fig. 2 is a block diagram conceptually illustrating an example of a base station in communication with a user equipment (UE) in a wireless communication network, in accordance with various aspects of the present disclosure.
  • UE user equipment
  • Fig. 3 is a diagram illustrating an example of resolving secondary cell group (SCG) releases with dual subscriber identity modules (SIMs) , in accordance with various aspects of the present disclosure.
  • Fig. 4 is a diagram illustrating an example of resolving SCG releases with dual SIMs, in accordance with various aspects of the present disclosure.
  • Fig. 5 is a diagram illustrating an example process performed, for example, by a UE, in accordance with various aspects of the present disclosure.
  • a user equipment may be attached to a cell and registered in a non-standalone (NSA) mode.
  • the UE may attempt to access a New Radio (NR) data service, which involves adding a secondary cell group (SCG) .
  • SCG secondary cell group
  • the UE may transmit a service request to the cell and an SCG may be added. However, the SCG may be released soon after the SCG is added.
  • the UE may continue adding and dropping the SCG, while preventing any other data service.
  • One solution to address this is to add the cell to a list of cells (e.g., NSA bar cell list) to which the UE is barred from transmitting service requests.
  • the UE may refrain from transmitting service requests to any cells on the list.
  • the UE may be configured with a dual subscriber identity modem (SIM) modem. If a first SIM of the UE experiences SCG releases with a cell, a second SIM of the UE may also experience SCG releases with the cell. If the second SIM requests an SCG for the NR data service, but is unaware of the SCG releases that occur with the cell, the second SIM may cause the UE to waste time, power, processing resources, and signaling resources repeatedly adding and dropping the SCG, while not having any data service.
  • SIM subscriber identity modem
  • the first SIM may signal information about the list of cells to the second SIM.
  • the second SIM may either reselect to another cell, or try to add the SCG with the cell only once before reselecting to the other cell.
  • the second SIM accesses the NR data service, or at least maintains some type of data service, and conserves time, power, processing resources, and signaling resources that would have otherwise been used repeatedly adding and dropping the SCG.
  • Fig. 1 is a diagram illustrating a wireless network 100 in which aspects of the present disclosure may be practiced.
  • the wireless network 100 may be an LTE network or some other wireless network, such as a 5G or NR network.
  • the wireless network 100 may include a number of BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities.
  • a BS is an entity that communicates with 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 receive point (TRP) , and/or the like.
  • Each BS may provide communication 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 communication 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) ) .
  • 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.
  • eNB base station
  • NR BS NR BS
  • gNB gNode B
  • AP AP
  • node B node B
  • 5G NB 5G NB
  • cell may be used interchangeably herein.
  • 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.
  • 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 110d may communicate with macro BS 110a and a UE 120d in order to facilitate communication between 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.
  • 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 impacts on interference in 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) .
  • a network controller 130 may couple to a set of BSs and may provide coordination and control for these BSs.
  • Network controller 130 may communicate with the BSs via a backhaul.
  • the BSs may also communicate with one another, e.g., directly or indirectly via a wireless or wireline backhaul.
  • UEs 120 may be dispersed throughout 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 communication 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.
  • PDA personal digital assistant
  • WLL wireless local loop
  • Some UEs may be considered machine-type communication (MTC) or evolved or enhanced machine-type communication (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 communication link.
  • Some UEs may be considered Internet-of-Things (IoT) devices, and/or may be implemented as NB-IoT (narrowband internet of things) devices.
  • IoT Internet-of-Things
  • NB-IoT narrowband internet of things
  • UE 120 may be included inside a housing that houses components of UE 120, such as processor components, memory components, and/or the like.
  • the processor components and the memory components may be coupled together.
  • the processor components e.g., one or more processors
  • the memory components e.g., a memory
  • the processor components and the memory components may be operatively coupled, communicatively coupled, electronically coupled, electrically coupled, 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.
  • V2X vehicle-to-everything
  • the UE 120 may perform scheduling operations, resource selection operations, and/or other operations described elsewhere herein as being performed by the base station 110.
  • UE 120 may perform operations to resolve SCG releases by a cell.
  • Fig. 1 is provided as an example. Other examples may differ from what is described with regard to Fig. 1.
  • Fig. 2 shows a block diagram of a design 200 of base station 110 and UE 120, which may be one of the base stations and one of the UEs in Fig. 1.
  • 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. 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.
  • MCS modulation and coding schemes
  • 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) ) .
  • a transmit (TX) multiple-input multiple-output (MIMO) 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.
  • TX transmit
  • MIMO multiple-input multiple-output
  • 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 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 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 (RSSI) , reference signal received quality (RSRQ) , channel quality indicator (CQI) , and/or the like.
  • RSRP reference signal received power
  • RSSI received signal strength indicator
  • RSRQ reference signal received quality
  • CQI channel quality indicator
  • one or more components of UE 120 may be included in a housing.
  • Network controller 130 may include communication unit 294, controller/processor 290, and memory 292.
  • Network controller 130 may include, for example, one or more devices in a core network.
  • Network controller 130 may communicate with base station 110 via communication unit 294.
  • 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 controller/processor 280. Transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from 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 base station 110.
  • the UE 120 includes a transceiver.
  • the transceiver may include any combination of antenna (s) 252, modulators and/or demodulators 254, MIMO detector 256, receive processor 258, transmit processor 264, and/or TX MIMO processor 266.
  • the transceiver may be used by a processor (e.g., controller/processor 280) and memory 282 to perform aspects of any of the methods described herein, for example, as described with reference to Figs. 3-5.
  • the uplink signals from UE 120 and other UEs may be received by antennas 234, processed by demodulators 232, 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 UE 120.
  • Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to controller/processor 240.
  • Base station 110 may include communication unit 244 and communicate to network controller 130 via communication unit 244. In some aspects, the base station 110 includes a transceiver.
  • the transceiver may include any combination of antenna (s) 234, modulators and/or demodulators 232, MIMO detector 236, receive processor 238, transmit processor 220, and/or TX MIMO processor 230.
  • the transceiver may be used by a processor (e.g., controller/processor 240) and memory 242 to perform aspects of any of the methods described herein, for example, as described with reference to Figs. 3-5.
  • Controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform one or more techniques associated with resolving secondary cell group (SCG) releases with dual subscriber identity modules (SIMs) , as described in more detail elsewhere herein.
  • controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform or direct operations of, for example, process 500 of Fig. 5, and/or other processes as described herein.
  • Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively.
  • memory 242 and/or memory 282 may comprise a non-transitory computer-readable medium storing one or more instructions for wireless communication.
  • the one or more instructions when executed (e.g., directly, or after compiling, converting, interpreting, and/or the like) by one or more processors of the base station 110 and/or the UE 120, may perform or direct operations of, for example, process 500 of Fig. 5, and/or other processes as described herein.
  • executing instructions may include running the instructions, converting the instructions, compiling the instructions, interpreting the instructions, and/or the like.
  • a scheduler 246 may schedule UEs for data transmission on the downlink and/or uplink.
  • UE 120 may include means for determining, for a first SIM registered in an NSA mode, that a count of SCG releases from a first cell satisfies a count threshold, based at least in part on transmitting one or more service requests to add an SCG with the first cell, means for adding, for the first SIM, the first cell to a list of one or more cells to which service requests to add the SCG are barred, based at least in part on determining that the count of SCG releases satisfies the count threshold, means for determining, for a second SIM of the UE, that a second cell is not on the list, means for transmitting, for the second SIM, a service request to the second cell to add the SCG based at least in part on the determining that the second cell is not on the list, and/or the like.
  • such means may include one or more components of UE 120 described in connection with Fig. 2, such as controller/processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and/or the like.
  • Fig. 2 is provided as an example. Other examples may differ from what is described with regard to Fig. 2.
  • a UE may be registered in NSA mode and attached to an LTE cell.
  • the UE may attempt to access an NR data service, which involves adding an SCG.
  • the UE may transmit a service request to the LTE cell and receive a radio resource control (RRC) reconfiguration message, indicating that an SCG is added.
  • RRC radio resource control
  • the UE may soon receive an RRC reconfiguration message indicating that the SCG was released.
  • the UE may not only drop the SCG but may lose data service altogether.
  • the UE may continue adding and dropping the SCG and preventing any other data service, providing a bad user experience.
  • One solution to address this is to add the cell to a list of cells (e.g., NSA bar cell list) to which the UE is barred from transmitting service requests, if a count of SCG releases satisfies a count threshold (e.g., maximum count) .
  • the UE may refrain from transmitting service requests to any cells on the list.
  • the UE may be configured with a dual SIM modem. If a first SIM of the UE experiences SCG releases with a cell, a second SIM of the UE may also experience SCG releases with the cell. If the second SIM requests an SCG for the NR data service, but is unaware of SCG releases caused by the cell, the UE may waste time, power, processing resources, and signaling resources repeatedly adding and dropping the SCG while not having any data service.
  • the first SIM may signal information about the list to the second SIM.
  • the first SIM and the second SIM may synchronize lists. In this way, if the second SIM determines to add the NR data service, the second SIM may directly proceed with reselecting to another cell that is not on the list. As a result, the second SIM accesses the NR data service or at least maintains some type of data service. In some aspects, the second SIM may try once to add the SCG before reselecting to another cell.
  • Fig. 3 is a diagram illustrating an example 300 of restoring data service with dual SIMs, in accordance with various aspects of the present disclosure.
  • Fig. 3 shows a signaling diagram for a first SIM and a second SIM of a UE (e.g., a UE depicted in Figs. 1 and 2, and/or the like) . While actions may be described as being performed by the first SIM or the second SIM, this may mean that the UE is performing the action for the first SIM or for the second SIM.
  • Either SIM may support dual SIM dual active or dual SIM dual standby, and either SIM may be associated with a default data subscriber (DDS) subscriber registration (e.g., NSA) or a non-DDS subscriber registration (e.g., LTE) .
  • DDS data subscriber
  • NSA non-DDS subscriber registration
  • the first SIM may register with an NSA network.
  • the NSA network may involve the infrastructure of an LTE network that provides access to the Internet.
  • the second SIM
  • the first SIM may attach to a cell that may be an NSA cell, an LTE cell, an NR cell, and/or the like.
  • the cell is shown as an LTE Cell 1.
  • the first SIM (or the UE for the first SIM) may transmit an attach request to LTE Cell 1 (indicating support for dual connectivity with New Radio, or DCNR) .
  • the first SIM (or the UE for the first SIM) may accept the attach request.
  • the first SIM may transmit a tracking area update (TAU) request for a TAU procedure.
  • the TAU procedure is a procedure applicable to LTE networks, and normally updates a location of the UE within an LTE network. If LTE cells are maintained by the same operator, the UE does not need a new registration and a TAU procedure is sufficient to attach the UE to an LTE cell.
  • the first SIM may transmit a service request to LTE Cell 1 to add an SCG for the NR data service.
  • the first SIM may receive an RRC reconfiguration message indicating that the SCG is added.
  • the UE may transmit an SCG complete message for the first SIM, as shown by reference number 320.
  • the first SIM may receive an RRC reconfiguration message indicating that the SCG is released. There may be some network configuration issue or problematic conditions.
  • the first SIM (or the UE for the first SIM) may count SCG releases. In some aspects, the first SIM may count SCG releases during a specified amount of time.
  • the first SIM may add the cell to a bar cell list, which is a list of cells to which service requests for the NR data service are barred.
  • the first SIM may reselect to another cell (e.g., LTE Cell 2) that is not on the list, as shown by reference number 335. This may include transmitting a registration request, which may include an attach request or a TAU request.
  • the second SIM may be unaware that LTE Cell 1 is causing SCG releases.
  • the first SIM may signal to the second SIM that LTE Cell 1 has been added to a bar cell list for the first SIM.
  • the second SIM may use the information to synchronize a bar cell list for the second SIM with the bar cell list for the first SIM. If the second SIM is to access the NR data service, the second SIM (or the UE for the second SIM) may determine that LTE Cell 1 is on the bar cell list and may proceed directly with reselecting to another cell (e.g., LTE Cell 2) , as shown by reference number 345. This may include transmitting a registration request.
  • the second SIM (or the UE for the second SIM) may transmit a service request for the NR data service to LTE Cell 2.
  • the second SIM may receive an RRC reconfiguration message from LTE Cell 2 indicating that an SCG was added.
  • the second SIM may transmit an SCG complete message.
  • the SCG may not be dropped and the UE may be in a packet switched data transfer state, as shown by reference number 360.
  • the second SIM may help the UE to save the time, power, processing resources, and signaling resources by not repeatedly adding and dropping the SCG.
  • the UE may remove a cell from the bar cell list upon expiration of a timer for being on the bar cell list.
  • the timer may be set to a specified time duration.
  • the UE may remove a cell from the bar cell list based at least in part on an instruction from a base station to remove the cell.
  • all cells may be removed from the bar cell list if the UE is powered off, rebooted, or if a SIM card is removed from the UE.
  • Fig. 3 is provided as an example. Other examples may differ from what is described with regard to Fig. 3.
  • Fig. 4 is a diagram illustrating an example 400 of resolving SCG releases with dual SIMs, in accordance with various aspects of the present disclosure.
  • Fig. 4 shows some signals from the signaling diagram of Fig. 3.
  • the second SIM may update a bar cell list for the second SIM based at least in part on bar cell list information signaled from the first SIM.
  • the second SIM (or the UE for the second SIM) may try once to add and maintain the SCG with LTE Cell 1.
  • the second SIM (or the UE for the second SIM) may transmit a service request for the NR data service to LTE Cell 1.
  • the second SIM may receive an SCG addition message.
  • the second SIM may transmit an SCG complete message.
  • the second SIM may proceed with reselecting to another cell such as LTE Cell 2. In this way, the second SIM is not repeatedly adding and dropping the SCG.
  • the second SIM may try one or more other times (e.g., preconfigured number of times) , but still fewer times than a count threshold for adding a cell to a bar cell list.
  • Fig. 4 is provided as an example. Other examples may differ from what is described with respect to Fig. 4.
  • Fig. 5 is a diagram illustrating an example process 500 performed, for example, by a UE, in accordance with various aspects of the present disclosure.
  • Example process 500 is an example where the UE (e.g., UE 120 and/or the like) performs operations associated with resolving SCG releases with dual SIMs.
  • the UE e.g., UE 120 and/or the like
  • process 500 may include determining, for a first SIM registered in an NSA mode, that a count of SCG releases from a first cell satisfies a count threshold, based at least in part on transmitting one or more service requests to add an SCG with the first cell (block 510) .
  • the UE e.g., using receive processor 258, transmit processor 264, controller/processor 280, memory 282, and/or the like
  • process 500 may include adding, for the first SIM, the first cell to a list of one or more cells to which service requests to add the SCG are barred, based at least in part on determining that the count of SCG releases satisfies the count threshold (block 520) .
  • the UE e.g., using receive processor 258, transmit processor 264, controller/processor 280, memory 282, and/or the like
  • process 500 may include determining, for a second SIM of the UE, that a second cell is not on the list (block 530) .
  • the UE e.g., using receive processor 258, transmit processor 264, controller/processor 280, memory 282, and/or the like
  • process 500 may include transmitting, for the second SIM, a service request to the second cell to add the SCG based at least in part on the determining that the second cell is not on the list (block 540) .
  • the UE e.g., using receive processor 258, transmit processor 264, controller/processor 280, memory 282, and/or the like
  • Process 500 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.
  • process 500 includes causing the first SIM to signal information for the list to the second SIM.
  • process 500 includes causing the second SIM to update a list of one or more cells maintained for the second SIM based at least in part on the information.
  • process 500 includes, prior to determining that the second cell is not on the list, transmitting, for the second SIM, a service request to add the SCG with the first cell based at least in part on receiving the signal information for the list
  • process 500 includes causing the first SIM and the second SIM to share the list with each other.
  • determining that the count of SCG releases from the first cell satisfies the count threshold includes determining that the count of SCG releases from the first cell satisfies the count threshold within a specified amount of time.
  • process 500 includes removing the first cell from the list based at least in part on receiving an instruction to remove the first cell from the list.
  • process 500 includes removing the first cell from the list based at least in part on expiration of a specified time duration for the first cell being on the list.
  • process 500 includes starting, based at least in part on the adding the first cell to the list, a timer that indicates a specified amount of time that the first cell is to remain on the list.
  • process 500 includes removing all cells from the list based at least in part on one of the UE powering off, rebooting, or removal of one or more of the first SIM or the second SIM from the UE.
  • process 500 includes transmitting, for the first SIM, a service request to the second cell based at least in part on adding the first cell to the list.
  • process 500 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 5. Additionally, or alternatively, two or more of the blocks of process 500 may be performed in parallel.
  • the term “component” is intended to be broadly construed as hardware, software, and/or a combination of hardware and software.
  • a processor is implemented in hardware, software, and/or a combination of hardware and software.
  • Software is to be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and/or the like, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • 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.
  • “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) .
  • the terms “has, ” “have, ” “having, ” and/or the like are intended to be open-ended terms. Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise.

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  • Engineering & Computer Science (AREA)
  • Databases & Information Systems (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Selon divers aspects, la présente invention concerne, de manière générale, la communication sans fil. Selon certains aspects, un équipement utilisateur (UE) peut déterminer, pour un premier module d'identité d'abonné (SIM), qu'un comptage de publications de groupes de cellules secondaires (SCG) d'une première cellule satisfait à un seuil de comptage, sur la base, au moins en partie, de la transmission de demandes de service visant à ajouter un SCG. L'UE peut ajouter, pour le premier SIM, la première cellule à une liste de cellules pour lesquelles des demandes de service visant à ajouter le SCG sont interdites. L'UE peut déterminer, pour un second SIM de l'UE, qu'une seconde cellule ne se trouve pas sur la liste, et transmettre, pour le second SIM, une demande de service à la seconde cellule pour ajouter le SCG sur la base, au moins en partie, de la détermination selon laquelle la seconde cellule ne se trouve pas sur la liste. L'invention concerne de nombreux autres aspects.
PCT/CN2020/093089 2020-05-29 2020-05-29 Résolution de publications de groupes de cellules secondaires pour des modules d'identité d'abonné doubles Ceased WO2021237641A1 (fr)

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