WO2021223045A1 - Récupération de service améliorée après terminaison d'appel dans un dispositif à double sim - Google Patents

Récupération de service améliorée après terminaison d'appel dans un dispositif à double sim Download PDF

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Publication number
WO2021223045A1
WO2021223045A1 PCT/CN2020/088557 CN2020088557W WO2021223045A1 WO 2021223045 A1 WO2021223045 A1 WO 2021223045A1 CN 2020088557 W CN2020088557 W CN 2020088557W WO 2021223045 A1 WO2021223045 A1 WO 2021223045A1
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Prior art keywords
radio access
access technology
service
voice call
cell
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PCT/CN2020/088557
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English (en)
Inventor
Dongsheng Wang
Chaofeng HUI
Guojing LIU
Xiaomeng Lu
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Qualcomm Incorporated
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Priority to PCT/CN2020/088557 priority Critical patent/WO2021223045A1/fr
Publication of WO2021223045A1 publication Critical patent/WO2021223045A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • 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
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/005—Multiple registrations, e.g. multihoming
    • 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

Definitions

  • aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for improving service recovery after call termination in a dual subscriber identity module (SIM) device.
  • SIM subscriber identity module
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, etc. These 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, etc. ) .
  • available system resources e.g., bandwidth, transmit power, etc.
  • multiple-access systems examples include 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) systems, LTE Advanced (LTE-A) systems, 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, and time division synchronous code division multiple access (TD-SCDMA) systems, to name a few.
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • LTE-A LTE Advanced
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • New radio e.g., 5G NR
  • 5G NR is an example of an emerging telecommunication standard.
  • NR is a set of enhancements to the LTE mobile standard promulgated by 3GPP.
  • 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 OFDMA with a cyclic prefix (CP) on the downlink (DL) and on the uplink (UL) .
  • CP cyclic prefix
  • NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.
  • MIMO multiple-input multiple-output
  • the apparatus generally includes a processing system configured to: perform a first registration procedure to establish a first service associated with a first radio access technology; perform a second registration procedure to establish a second service associated with a second radio access technology; initiate a voice call using the second radio access technology, wherein initiating the voice call includes dropping the first service associated with the first radio access technology; detect a termination of the voice call; and perform, after detecting the termination of the voice call, a cell search procedure for cells corresponding to at least the first radio access technology to reestablish the first service.
  • the method generally includes performing a first registration procedure to establish a first service associated a first radio access technology; performing a second registration procedure to establish a second service associated with a second radio access technology; initiating a voice call using the second radio access technology, wherein initiating the voice call includes dropping the first service associated with the first radio access technology; detecting a termination of the voice call; and performing, after detecting the termination of the voice call, a cell search procedure for cells corresponding to at least the first radio access technology to reestablish the first service.
  • the apparatus generally includes means for performing a first registration procedure to establish a first service associated a first radio access technology; means for performing a second registration procedure to establish a second service associated with a second radio access technology; means for initiating a voice call using the second radio access technology, wherein initiating the voice call includes dropping the first service associated with the first radio access technology; means for detecting a termination of the voice call; and means for performing, after detecting the termination of the voice call, a cell search procedure for cells corresponding to at least the first radio access technology to reestablish the first service.
  • the computer-readable medium generally includes instructions executable to: perform a first registration procedure to establish a first service associated with a first radio access technology; perform a second registration procedure to establish a second service associated with a second radio access technology; initiate a voice call using the second radio access technology, wherein initiating the voice call includes dropping the first service associated with the first radio access technology; detect a termination of the voice call; and perform, after detecting the termination of the voice call, a cell search procedure for cells corresponding to at least the first radio access technology to reestablish the first service.
  • the UE generally includes at least one antenna; and a processing system configured to: perform, via the at least one antenna, a first registration procedure to establish a first service associated with a first radio access technology; perform, via the at least one antenna, a second registration procedure to establish a second service associated with a second radio access technology; initiate a voice call using the second radio access technology, wherein initiating the voice call includes dropping the first service associated with the first radio access technology; detect a termination of the voice call; and perform, via the at least one antenna and after detecting the termination of the voice call, a cell search procedure for cells corresponding to at least the first radio access technology to reestablish the first service.
  • a processing system configured to: perform, via the at least one antenna, a first registration procedure to establish a first service associated with a first radio access technology; perform, via the at least one antenna, a second registration procedure to establish a second service associated with a second radio access technology; initiate a voice call using the second radio access technology, wherein initiating the voice call includes dropping the first
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the appended drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed.
  • FIG. 1 is a block diagram conceptually illustrating an example telecommunications system, in accordance with certain aspects of the present disclosure.
  • FIG. 2 is a block diagram conceptually illustrating a design of an example a base station (BS) and user equipment (UE) , in accordance with certain aspects of the present disclosure.
  • BS base station
  • UE user equipment
  • FIG. 3 is an example frame format for new radio (NR) , in accordance with certain aspects of the present disclosure.
  • FIG. 4 is a flow diagram illustrating example operations for wireless communication by a UE, in accordance with certain aspects of the present disclosure.
  • FIG. 5 is a call flow diagram illustrating example operations for recovering service after termination of a call, in accordance with certain aspects of the present disclosure.
  • FIG. 6 illustrates a communications device that may include various components configured to perform operations for the techniques disclosed herein in accordance with aspects of the present disclosure.
  • aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums for improving service recovery after call termination in the dual subscriber identity module (SIM) device.
  • SIM subscriber identity module
  • the techniques presented herein allow a user equipment (UE) to delay performing a cell search to reestablish a first service associated with a first radio access technology until after termination of a voice call associated with a second service.
  • the UE may terminate and existing cell search performed during the voice call when the voice call is terminated and start a new cell search upon termination of the voice call.
  • the UE may be able to detect a cell associated with the first service and first technology before for cells associated with different technologies, saving the UE time and reducing power consumption.
  • 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.
  • RAT may also be referred to as a radio technology, an air interface, etc.
  • a frequency may also be referred to as a carrier, a subcarrier, a frequency channel, a tone, a subband, etc.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • the techniques described herein may be used for various wireless networks and radio technologies. While aspects may be described herein using terminology commonly associated with 3G, 4G, and/or new radio (e.g., 5G NR) wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems.
  • 3G, 4G, and/or new radio e.g., 5G NR
  • NR access may support various wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g., 80 MHz or beyond) , millimeter wave (mmW) targeting high carrier frequency (e.g., 25 GHz or beyond) , massive machine type communications MTC (mMTC) targeting non-backward compatible MTC techniques, and/or mission critical targeting ultra-reliable low-latency communications (URLLC) .
  • eMBB enhanced mobile broadband
  • mmW millimeter wave
  • mMTC massive machine type communications MTC
  • URLLC ultra-reliable low-latency communications
  • These services may include latency and reliability requirements.
  • These services may also have different transmission time intervals (TTI) to meet respective quality of service (QoS) requirements.
  • TTI transmission time intervals
  • QoS quality of service
  • these services may co-exist in the same subframe.
  • NR supports beamforming and beam direction may be dynamically configured. MIMO transmissions with precoding may also be supported.
  • MIMO configurations in the DL may support up to 8 transmit antennas with multi-layer DL transmissions up to 8 streams and up to 2 streams per UE. Multi-layer transmissions with up to 2 streams per UE may be supported. Aggregation of multiple cells may be supported with up to 8 serving cells.
  • FIG. 1 illustrates an example wireless communication network 100 in which aspects of the present disclosure may be performed.
  • the wireless communication network 100 may be an NR system (e.g., a 5G NR network) .
  • the wireless communication network 100 may be in communication with a core network 132.
  • the core network 132 may in communication with one or more base station (BSs) 110 and/or user equipment (UE) 120 in the wireless communication network 100 via one or more interfaces.
  • BSs base station
  • UE user equipment
  • the wireless communication network 100 may include a number of BSs 110a-z (each also individually referred to herein as BS 110 or collectively as BSs 110) and other network entities.
  • a BS 110 may provide communication coverage for a particular geographic area, sometimes referred to as a “cell” , which may be stationary or may move according to the location of a mobile BS 110.
  • the BSs 110 may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in wireless communication network 100 through various types of backhaul interfaces (e.g., a direct physical connection, a wireless connection, a virtual network, or the like) using any suitable transport network.
  • backhaul interfaces e.g., a direct physical connection, a wireless connection, a virtual network, or the like
  • the BSs 110a, 110b and 110c may be macro BSs for the macro cells 102a, 102b and 102c, respectively.
  • the BS 110x may be a pico BS for a pico cell 102x.
  • the BSs 110y and 110z may be femto BSs for the femto cells 102y and 102z, respectively.
  • a BS may support one or multiple cells.
  • a network controller 130 may couple to a set of BSs 110 and provide coordination and control for these BSs 110 (e.g., via a backhaul) .
  • the BSs 110 communicate with UEs 120a-y (each also individually referred to herein as UE 120 or collectively as UEs 120) in the wireless communication network 100.
  • the UEs 120 (e.g., 120x, 120y, etc. ) may be dispersed throughout the wireless communication network 100, and each UE 120 may be stationary or mobile.
  • Wireless communication network 100 may also include relay stations (e.g., relay station 110r) , also referred to as relays or the like, that receive a transmission of data and/or other information from an upstream station (e.g., a BS 110a or a UE 120r) and sends a transmission of the data and/or other information to a downstream station (e.g., a UE 120 or a BS 110) , or that relays transmissions between UEs 120, to facilitate communication between devices.
  • relay stations e.g., relay station 110r
  • relays or the like that receive a transmission of data and/or other information from an upstream station (e.g., a BS 110a or a UE 120r) and sends a transmission of the data and/or other information to a downstream station (e.g., a UE 120 or a BS 110) , or that relays transmissions between UEs 120, to facilitate communication between devices.
  • the BSs 110 and UEs 120 may be configured for improving service recovery after call termination in a dual subscriber identity module (SIM) device.
  • SIM subscriber identity module
  • the UE 120a includes a service reestablishment module 122.
  • the service reestablishment module 122 may be configured to perform the operations illustrated in FIGs. 4 and 5, as well as other operations described herein for improving service recovery after call termination in the dual SIM device, in accordance with aspects of the present disclosure.
  • FIG. 2 illustrates example components of BS 110a and UE 120a (e.g., in the wireless communication network 100 of FIG. 1) , which may be used to implement aspects of the present disclosure.
  • a transmit processor 220 may receive data from a data source 212 and control information from a controller/processor 240.
  • the control information may be for the physical broadcast channel (PBCH) , physical control format indicator channel (PCFICH) , physical hybrid ARQ indicator channel (PHICH) , physical downlink control channel (PDCCH) , group common PDCCH (GC PDCCH) , etc.
  • the data may be for the physical downlink shared channel (PDSCH) , etc.
  • a medium access control (MAC) -control element (MAC-CE) is a MAC layer communication structure that may be used for control command exchange between wireless nodes.
  • the MAC-CE may be carried in a shared channel such as a physical downlink shared channel (PDSCH) , a physical uplink shared channel (PUSCH) , or a physical sidelink shared channel (PSSCH) .
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • PSSCH physical sidelink shared channel
  • the processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively.
  • the transmit processor 220 may also generate reference symbols, such as for the primary synchronization signal (PSS) , secondary synchronization signal (SSS) , and channel state information reference signal (CSI-RS) .
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) 232a-232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream.
  • MIMO multiple-input multiple-output
  • Each modulator may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • Downlink signals from modulators 232a-232t may be transmitted via the antennas 234a-234t, respectively.
  • the antennas 252a-252r may receive the downlink signals from the BS 110a and may provide received signals to the demodulators (DEMODs) in transceivers 254a-254r, respectively.
  • Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples.
  • Each demodulator may further process the input samples (e.g., for OFDM, etc. ) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from all the demodulators 254a-254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 120a to a data sink 260, and provide decoded control information to a controller/processor 280.
  • a transmit processor 264 may receive and process data (e.g., for the physical uplink shared channel (PUSCH) ) from a data source 262 and control information (e.g., for the physical uplink control channel (PUCCH) from the controller/processor 280.
  • the transmit processor 264 may also generate reference symbols for a reference signal (e.g., for the sounding reference signal (SRS) ) .
  • the symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the modulators in transceivers 254a-254r (e.g., for SC-FDM, etc. ) , and transmitted to the BS 110a.
  • the uplink signals from the UE 120a may be received by the antennas 234, processed by the modulators 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 the UE 120a.
  • the receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller/processor 240.
  • the memories 242 and 282 may store data and program codes for BS 110a and UE 120a, respectively.
  • a scheduler 244 may schedule UEs for data transmission on the downlink and/or uplink.
  • Antennas 252, processors 266, 258, 264, and/or controller/processor 280 of the UE 120a and/or antennas 234, processors 220, 230, 238, and/or controller/processor 240 of the BS 110a may be used to perform the various techniques and methods described herein for improving service recovery after call termination in the dual SIM device.
  • the controller/processor 280 of the UE 120a includes a service reestablishment module 281 that may be configured to perform the operations illustrated in FIGs. 4 and 5, as well as other operations described herein for improving service recovery after call termination in the dual SIM device, according to aspects described herein.
  • FIGs. 4 and 5 may be configured to perform the operations illustrated in FIGs. 4 and 5, as well as other operations described herein for improving service recovery after call termination in the dual SIM device, according to aspects described herein.
  • other components of the UE 120a and BS 110a may be used to perform the operations described herein.
  • NR may utilize orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) on the uplink and downlink.
  • OFDM orthogonal frequency division multiplexing
  • CP cyclic prefix
  • NR may support half-duplex operation using time division duplexing (TDD) .
  • OFDM and single-carrier frequency division multiplexing (SC-FDM) partition the system bandwidth into multiple orthogonal subcarriers, which are also commonly referred to as tones, bins, etc. Each subcarrier may be modulated with data. Modulation symbols may be sent in the frequency domain with OFDM and in the time domain with SC-FDM.
  • the spacing between adjacent subcarriers may be fixed, and the total number of subcarriers may be dependent on the system bandwidth.
  • the minimum resource allocation may be 12 consecutive subcarriers.
  • the system bandwidth may also be partitioned into subbands. For example, a subband may cover multiple RBs.
  • NR may support a base subcarrier spacing (SCS) of 15 KHz and other SCS may be defined with respect to the base SCS (e.g., 30 kHz, 60 kHz, 120 kHz, 240 kHz, etc. ) .
  • SCS base subcarrier spacing
  • FIG. 3 is a diagram showing an example of a frame format 300 for NR.
  • the transmission timeline for each of the downlink and uplink may be partitioned into units of radio frames.
  • Each radio frame may have a predetermined duration (e.g., 10 ms) and may be partitioned into 10 subframes, each of 1 ms, with indices of 0 through 9.
  • Each subframe may include a variable number of slots (e.g., 1, 2, 4, 8, 16, ...slots) depending on the SCS.
  • Each slot may include a variable number of symbol periods (e.g., 7 or 14 symbols) depending on the SCS.
  • the symbol periods in each slot may be assigned indices.
  • a mini-slot which may be referred to as a sub-slot structure, refers to a transmit time interval having a duration less than a slot (e.g., 2, 3, or 4 symbols) .
  • Each symbol in a slot may indicate a link direction (e.g., DL, UL, or flexible) for data transmission and the link direction for each subframe may be dynamically switched.
  • the link directions may be based on the slot format.
  • Each slot may include DL/UL data as well as DL/UL control information.
  • two different subscriptions may be supported on a same device, such as a user equipment, and are based on two separate subscriber identification module (SIMs) , known as multi-SIM (MSIM) .
  • SIMs subscriber identification module
  • MSIM subscriber identification module
  • QOS Quality of Service
  • different subscriptions may provide services on the same or different radio access technologies (RATs) .
  • RATs radio access technologies
  • MSIM solutions use less resources while performing operations on two different RATs than that needed by two independent solutions with the goal of optimizing resource (RF, MIPs, etc. ) usage as well as providing enhanced user experience.
  • the device may include a dual transceiver that may provide dual receive and dual access (DSDA) .
  • DSDA dual receive and dual access
  • each subscription may correspond to its own transceiver.
  • the device may include a single transceiver where two subscriptions share the same radio resources. Due to RF complexity, cost, and power consumption considerations, the majority of Dual subscription devices and solutions share a single transceiver.
  • 5G New Radio (NR) deployments aggressively moving ahead globally MSIM solutions now comprise of a combination of 5G + 4G/3G/2G RATs.
  • 5G solutions defined by Rel15 3GPP standards: non-standalone (NSA) and standalone 5G (SA) .
  • NSA non-standalone
  • SA standalone 5G
  • LTE long term evolution
  • LTE long term evolution
  • LTE radio access may be used as an anchor for all signaling and mobility management while adding a new 5G Carrier.
  • This architecture is attractive for early deployments of 5G NR access systems as networks may reuse the legacy operational LTE eNodeB (eNB) and evolved packet core (EPC) .
  • Non-standalone solutions are also attractive as they facilitate a seamless migration from 4G to 5G for networks leveraging existing LTE core network.
  • Dual Connectivity has been introduced to allow a UE to simultaneously connect to two different network points for achieving higher throughput, reliability and mobility robustness.
  • Evolved Universal Mobile Telecommunications Service Terrestrial Radio Access Network (EUTRAN) -NR Dual Connectivity (ENDC) is one form of dual connectivity using LTE and NR.
  • the UE may be connected to an LTE eNB and to NR gNB.
  • the LTE eNB may act as a master node (MeNB) while the gNB may act as a secondary node (SgNB) . Both nodes may interface with the Evolved packet core (EPC) in the user plane but the master node may have direct connection to EPC.
  • EPC Evolved packet core
  • the UE may be equipped with multiple subscriptions, such as a first subscription and a second subscription.
  • the first subscription may be associated with a first radio access technology (e.g., 5G NSA) while the second subscription may be associated with a second radio access technology (e.g., LTE) .
  • a first radio access technology e.g., 5G NSA
  • a second radio access technology e.g., LTE
  • these two subscriptions may share the same RF resources.
  • service associated with the first subscription e.g., 5G service
  • the UE may begin trying to recover the service associated with the first technology (e.g., 5G NSA) .
  • the UE may proceed to searching for cells associated with different radio access technologies (e.g., 3G, 2G, etc. ) to recover service for the first subscription.
  • the first subscription may then have access to the shared resources.
  • the UE since the UE has moved on from searching for cells associated with the first technology, the UE may establish service with a cell associated with the different radio access technologies (e.g., 3G, 2G, etc. ) . Thereafter, once the service is established with the cell associated with the different radio access technology, the UE may reselect back to an LTE cell to reestablish the 5G NSA service. Accordingly, the UE may experience a long delay and unnecessarily expend signaling and power resources when trying to reestablish the 5G NSA service after termination of the voice call.
  • the different radio access technologies e.g., 3G, 2G, etc.
  • aspects of the present disclosure provide techniques for improving service recovery after termination of a call for dual SIM device. For example, in some cases, techniques presented herein allow the UE to delay service recovery procedures for recovering a dropped service until after termination of the call. In other cases, techniques presented herein allow the UE to terminate an existing recovery procedures after termination of the call and to start a new recovery procedure after the termination of the call. By delaying these service recovery procedures or starting a new recovery procedure upon termination of the call, the UE may begin searching for cells associated with the first technology upon termination of the call as opposed to searching for cells associated with different radio access technologies upon termination of the call (e.g., since a search for cells associated with the first technology expired during the call) , as described above.
  • FIG. 4 is a flow diagram illustrating example operations 400 for wireless communication, in accordance with certain aspects of the present disclosure.
  • the operations 400 may be performed, for example, by UE (e.g., such as a UE 120a in the wireless communication network 100) .
  • Operations 400 may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor 280 of FIG. 2) .
  • the transmission and reception of signals by the UE in operations 400 may be enabled, for example, by one or more antennas (e.g., antennas 252 of FIG. 2) .
  • the transmission and/or reception of signals by the UE may be implemented via a bus interface of one or more processors (e.g., controller/processor 280) obtaining and/or outputting signals.
  • the operations 400 may begin, at 402, by performing a first registration procedure to establish a first service associated a first radio access technology.
  • the UE performs a second registration procedure to establish a second service associated with a second radio access technology.
  • the UE initiates a voice call using the second radio access technology, wherein initiating the voice call includes dropping the first service associated with the first radio access technology.
  • the UE detects a termination of the voice call.
  • the UE performs, after detecting the termination of the voice call, a cell search procedure for cells corresponding to at least the first radio access technology to reestablish the first service.
  • FIG. 5 is a call flow diagram illustrating example operations for improving service recovery after termination of the voice call.
  • the UE 120 may be a dual SIM device, include a first subscription 502 and a second subscription 504.
  • the first subscription 502 may be a 5G NSA subscription while the second subscription 504 may be an LTE subscription.
  • the UE 120 may perform a first registration procedure, corresponding to the first subscription, to establish a first service associated a first radio access technology.
  • the UE 120 may first register with a first LTE anchor cell 506.
  • An LTE core network and LTE radio access associated with the LTE anchor cell 506 may be used as an anchor for all signaling and mobility management while adding a new 5G carrier, as described below with respect to step 516.
  • the UE 120 performs a second registration procedure, corresponding to the second subscription, to establish a second service associated with a second radio access technology.
  • the UE may establish the second service with a secondary LTE cell 508 and function in an LTE-only mode.
  • the second radio access technology may be associated with or correspond to an LTE technology.
  • the second service may be established using a second set of credentials corresponding to the second subscription 504.
  • the second set of credentials may be stored in the first SIM or a second SIM of the UE.
  • the UE may then establish the first service with a secondary 5G NR cell 510 via the LTE anchor cell 506.
  • the first service may be associated with or correspond to a first radio access technology, such as a 5G NR technology, and may be established using a first set of credentials corresponding to the first subscription 502.
  • the first set of credentials may be stored in a first subscriber identity module (SIM) of the UE.
  • SIM subscriber identity module
  • the UE may operate in an ENDC mode, in which the UE may be dually connected to the LTE anchor cell 506 and the NR cell 510.
  • the LTE anchor cell may act as a master node (MeNB) while the secondary NR cell may act as a secondary node (SgNB) .
  • Both nodes may interface with the Evolved packet core (EPC) in the user plane but the master node may have direct connection to EPC.
  • EPC Evolved packet core
  • the UE may initiate a voice call corresponding to the second subscription 504 using the second radio access technology.
  • second radio access technology may share the same radio frequency (RF) resources with the first radio access technology.
  • RF radio frequency
  • the UE may immediately drop the first service upon initiation of the voice call. In other cases, the UE may drop the first service based on the UE using the second radio access technology and the shared RF resources for a threshold amount of time. For example, in some cases, upon initiation of the voice call, the UE may start a threshold timer. According to aspects, if the threshold timer expires before the voice call is finished, the UE may proceed with dropping
  • the UE normally when the UE loses/drops the first service, the UE will proceed with performing a cell search according to a defined order to find cells associated with the first technology to reestablish the first service.
  • the defined order may indicate to the UE to first search for cells associated with the first technology, such as 5G NR capable cells, followed by searching for third generation (3G) capable cells, and finally followed by searching for second generation (2G) capable cells.
  • the defined order which may be stored in memory of the UE, may be static or configurable based on signaling received from the network.
  • the UE may not be able to find any cells associated with the first technology to reestablish the first service associated with the first subscription 502. In this case, the UE would proceed with searching for 3G capable cells and then 2G capable cells. Accordingly, once the voice call is terminated, the UE would proceed in order with the cell search and may first find a 3G or 2G cell instead of a 5G NR cell. Thus, the UE would be forced to connect to the 3G or 2G cell and thereafter reselect to the 5G NR cell, wasting time and signaling/power resources.
  • the UE may delay performing the cell search until after termination of the voice call, as illustrated at 520.
  • the UE may detect a termination of the voice call. Accordingly, as illustrated at 524, the UE may perform, in response to and after detecting the termination of the voice call, a cell search procedure for cells corresponding to at least the first radio access technology to reestablish the first service.
  • the UE may be configured to perform the cell search procedure when triggered by a non-access stratum (NAS) layer.
  • NAS non-access stratum
  • the second subscription 504 may provide an indication to the first subscription 502 in the NAS layer of the UE to trigger the cell search. In response to the trigger, the UE may perform the cell search.
  • the UE may still perform the cell search during the voice call but may terminate the cell search upon detecting the voice call has terminated. Thereafter, the UE may perform a new cell search according to the defined order, ensuring that the UE will first search for cells associated with the first technology to reestablish the first service.
  • the cell search procedure may comprise the UE searching for cells corresponding to the first radio access technology (e.g., 5G NR cells) first before cells corresponding to a different radio access technology (e.g., 3G/2G cells) according to the defined order discussed above. Accordingly, in some cases, the UE may detect a first cell corresponding to the first radio access technology based on the cell search procedure. In some cases, the first cell may include the secondary 5G NR cell 510 or another 5G NR cell. Thereafter, the UE may reestablish the first service associated with the first radio access technology with the first cell.
  • the first radio access technology e.g., 5G NR cells
  • 3G/2G cells 3G/2G cells
  • the search procedure may further include searching for the cells corresponding to the different radio access technology (e.g., 3G cells and/or 2G cells) after a defined amount of time has passed without detecting the cells corresponding to the first radio access technology. For example, if the UE is not able to detect a cell associated with the first technology (e.g., a 5G NR cell) within a defined amount of time, the UE may proceed with searching for cells associated with different radio access technologies. In certain cases, if the UE reestablishes the first service with one of the cells associated with the different radio access technologies, they UE may thereafter try to reselect to a 5G NR cell.
  • the different radio access technology e.g., 3G cells and/or 2G cells
  • FIG. 6 illustrates a communications device 600 that may include various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein, such as the operations illustrated in FIG. 4.
  • the communications device 600 includes a processing system 602 coupled to a transceiver 608 (e.g., a transmitter and/or a receiver) .
  • the transceiver 608 is configured to transmit and receive signals for the communications device 600 via an antenna 610, such as the various signals as described herein.
  • the processing system 602 may be configured to perform processing functions for the communications device 600, including processing signals received and/or to be transmitted by the communications device 600.
  • the processing system 602 includes a processor 604 coupled to a computer-readable medium/memory 612 via a bus 606.
  • the computer-readable medium/memory 612 is configured to store instructions (e.g., computer-executable code) that when executed by the processor 604, cause the processor 604 to perform the operations illustrated in FIG. 4, or other operations for performing the various techniques discussed herein for improving service recovery after call termination in a dual subscriber identity module (SIM) device.
  • SIM subscriber identity module
  • computer-readable medium/memory 612 stores code 614 for performing a first registration procedure to establish a first service associated with a first radio access technology; code 616 for perform a second registration procedure to establish a second service associated with a second radio access technology; code 618 for initiating a voice call using the second radio access technology, wherein initiating the voice call includes dropping the first service associated with the first radio access technology; code 620 for detecting a termination of the voice call; and code 622 for performing, after detecting the termination of the voice call, a cell search procedure for cells corresponding to at least the first radio access technology to reestablish the first service.
  • the computer-readable medium/memory 612 may also store code 624 for searching for cells corresponding to the first radio access technology first before cells corresponding to a different radio access technology according to a defined order; code 626 for detecting a first cell corresponding to the first radio access technology; and code 628 for reestablishing the first service associated with the first radio access technology with the first cell.
  • the computer-readable medium/memory 612 may also store code 630 for searching for the cells corresponding to the different radio access technology after a defined amount of time has passed without detecting the cells corresponding to the first radio access technology.
  • the computer-readable medium/memory 612 may also store code 632 code for dropping the first service associated with the first radio access technology based on the apparatus using the second radio access technology and the RF resources for a threshold amount of time.
  • the computer-readable medium/memory 612 may also store code 634 for establishing the first service associated with the first radio access technology using a first set of credentials and establishing the second service associated with the second radio access technology using a second set of credentials.
  • the computer-readable medium/memory 612 may also store code 636 for registering with a long term evolution (LTE) anchor cell operating in a non-standalone (NSA) mode; and code 638 for establishing the first service with a secondary fifth generation (5G) new radio (NR) via the LTE anchor cell.
  • LTE long term evolution
  • NSA non-standalone
  • NR new radio
  • the processor 604 includes circuitry 614 for performing a first registration procedure to establish a first service associated with a first radio access technology; circuitry 616 for perform a second registration procedure to establish a second service associated with a second radio access technology; circuitry 618 for initiating a voice call using the second radio access technology, wherein initiating the voice call includes dropping the first service associated with the first radio access technology; circuitry 620 for detecting a termination of the voice call; and circuitry 622 for performing, after detecting the termination of the voice call, a cell search procedure for cells corresponding to at least the first radio access technology to reestablish the first service.
  • the processor 604 may also include circuitry 624 for searching for cells corresponding to the first radio access technology first before cells corresponding to a different radio access technology according to a defined order; circuitry 626 for detecting a first cell corresponding to the first radio access technology; and circuitry 628 for reestablishing the first service associated with the first radio access technology with the first cell.
  • the processor 604 may also include circuitry 630 for searching for the cells corresponding to the different radio access technology after a defined amount of time has passed without detecting the cells corresponding to the first radio access technology.
  • the processor 604 may also include circuitry 632 code for dropping the first service associated with the first radio access technology based on the apparatus using the second radio access technology and the RF resources for a threshold amount of time.
  • the processor 604 may also include circuitry 634 for establishing the first service associated with the first radio access technology using a first set of credentials and establishing the second service associated with the second radio access technology using a second set of credentials.
  • the processor 604 may also include circuitry 636 for registering with a long term evolution (LTE) anchor cell operating in a non-standalone (NSA) mode; and circuitry 638 for establishing the first service with a secondary fifth generation (5G) new radio (NR) via the LTE anchor cell.
  • LTE long term evolution
  • NSA non-standalone
  • NR new radio
  • NR e.g., 5G NR
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • a CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA) , cdma2000, etc.
  • UTRA Universal Terrestrial Radio Access
  • UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA.
  • cdma2000 covers IS-2000, IS-95 and IS-856 standards.
  • a TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM) .
  • GSM Global System for Mobile Communications
  • An OFDMA network may implement a radio technology such as NR (e.g. 5G RA) , Evolved UTRA (E-UTRA) , Ultra Mobile Broadband (UMB) , IEEE 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDMA, etc.
  • NR e.g. 5G RA
  • E-UTRA Evolved UTRA
  • UMB Ultra Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • IEEE 802.20 Flash-OFDMA
  • UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS) .
  • LTE and LTE-A are releases of UMTS that use E-UTRA.
  • UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described in documents from an organization named “3rd Generation Partnership Project” (3GPP) .
  • cdma2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) .
  • NR is an emerging wireless communications technology under development.
  • the term “cell” can refer to a coverage area of a Node B (NB) and/or a NB subsystem serving this coverage area, depending on the context in which the term is used.
  • NB Node B
  • BS next generation NodeB
  • AP access point
  • DU distributed unit
  • TRP transmission reception point
  • a BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or other types of cells.
  • 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 an association with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG) , UEs for users in the home, etc. ) .
  • 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 UE may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a Customer Premises Equipment (CPE) , a cellular phone, 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 computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, an appliance, a medical device or medical equipment, a biometric sensor/device, a wearable device such as a smart watch, smart clothing, smart glasses, a smart wrist band, smart jewelry (e.g., a smart ring, a smart bracelet, etc.
  • CPE Customer Premises Equipment
  • PDA personal digital assistant
  • WLL wireless local loop
  • MTC machine-type communication
  • eMTC evolved MTC
  • MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., that may communicate with a BS, 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.
  • a network e.g., a wide area network such as Internet or a cellular network
  • Some UEs may be considered Internet-of-Things (IoT) devices, which may be narrowband IoT (NB-IoT) devices.
  • IoT Internet-of-Things
  • NB-IoT narrowband IoT
  • a scheduling entity (e.g., a BS) allocates resources for communication among some or all devices and equipment within its service area or cell.
  • the scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities utilize resources allocated by the scheduling entity.
  • Base stations are not the only entities that may function as a scheduling entity.
  • a UE may function as a scheduling entity and may schedule resources for one or more subordinate entities (e.g., one or more other UEs) , and the other UEs may utilize the resources scheduled by the UE for wireless communication.
  • a UE may function as a scheduling entity in a peer-to-peer (P2P) network, and/or in a mesh network.
  • P2P peer-to-peer
  • UEs may communicate directly with one another in addition to communicating with a scheduling entity.
  • the methods disclosed herein comprise one or more steps or actions for achieving the methods.
  • the method steps and/or actions may be interchanged with one another without departing from the scope of the claims.
  • the order and/or use of specific steps and/or actions may be modified without departing from the scope of the claims.
  • a phrase referring to “at least one of” a list of items refers to any combination of those items, including single members.
  • “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c) .
  • determining encompasses a wide variety of actions. For example, “determining” may include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database or another data structure) , ascertaining and the like. Also, “determining” may include receiving (e.g., receiving information) , accessing (e.g., accessing data in a memory) and the like. Also, “determining” may include resolving, selecting, choosing, establishing and the like.
  • the various operations of methods described above may be performed by any suitable means capable of performing the corresponding functions.
  • the means may include various hardware and/or software component (s) and/or module (s) , including, but not limited to a circuit, an application specific integrated circuit (ASIC) , or processor.
  • ASIC application specific integrated circuit
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • PLD programmable logic device
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • an example hardware configuration may comprise a processing system in a wireless node.
  • the processing system may be implemented with a bus architecture.
  • the bus may include any number of interconnecting buses and bridges depending on the specific application of the processing system and the overall design constraints.
  • the bus may link together various circuits including a processor, machine-readable media, and a bus interface.
  • the bus interface may be used to connect a network adapter, among other things, to the processing system via the bus.
  • the network adapter may be used to implement the signal processing functions of the PHY layer.
  • a user interface e.g., keypad, display, mouse, joystick, etc.
  • a user interface e.g., keypad, display, mouse, joystick, etc.
  • the bus may also link various other circuits such as timing sources, peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further.
  • the processor may be implemented with one or more general-purpose and/or special-purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuitry that can execute software. Those skilled in the art will recognize how best to implement the described functionality for the processing system depending on the particular application and the overall design constraints imposed on the overall system.
  • the functions may be stored or transmitted over as one or more instructions or code on a computer readable medium.
  • Software shall be construed broadly to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • Computer-readable media include both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • the processor may be responsible for managing the bus and general processing, including the execution of software modules stored on the machine-readable storage media.
  • a computer-readable storage medium may be coupled to a processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor.
  • the machine-readable media may include a transmission line, a carrier wave modulated by data, and/or a computer readable storage medium with instructions stored thereon separate from the wireless node, all of which may be accessed by the processor through the bus interface.
  • the machine-readable media, or any portion thereof may be integrated into the processor, such as the case may be with cache and/or general register files.
  • machine-readable storage media may include, by way of example, RAM (Random Access Memory) , flash memory, ROM (Read Only Memory) , PROM (Programmable Read-Only Memory) , EPROM (Erasable Programmable Read-Only Memory) , EEPROM (Electrically Erasable Programmable Read-Only Memory) , registers, magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof.
  • RAM Random Access Memory
  • ROM Read Only Memory
  • PROM Programmable Read-Only Memory
  • EPROM Erasable Programmable Read-Only Memory
  • EEPROM Electrical Erasable Programmable Read-Only Memory
  • registers magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof.
  • the machine-readable media may be embodied in a computer-program product.
  • a software module may comprise a single instruction, or many instructions, and may be distributed over several different code segments, among different programs, and across multiple storage media.
  • the computer-readable media may comprise a number of software modules.
  • the software modules include instructions that, when executed by an apparatus such as a processor, cause the processing system to perform various functions.
  • the software modules may include a transmission module and a receiving module. Each software module may reside in a single storage device or be distributed across multiple storage devices.
  • a software module may be loaded into RAM from a hard drive when a triggering event occurs.
  • the processor may load some of the instructions into cache to increase access speed.
  • One or more cache lines may then be loaded into a general register file for execution by the processor.
  • any connection is properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared (IR) , radio, and microwave
  • the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
  • Disk and disc include compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , floppy disk, and disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers.
  • computer-readable media may comprise non-transitory computer-readable media (e.g., tangible media) .
  • computer-readable media may comprise transitory computer-readable media (e.g., a signal) . Combinations of the above should also be included within the scope of computer-readable media.
  • certain aspects may comprise a computer program product for performing the operations presented herein.
  • a computer program product may comprise a computer-readable medium having instructions stored (and/or encoded) thereon, the instructions being executable by one or more processors to perform the operations described herein, for example, instructions for performing the operations described herein and illustrated in FIG. 4 and/or FIG. 5.
  • modules and/or other appropriate means for performing the methods and techniques described herein can be downloaded and/or otherwise obtained by a user terminal and/or base station as applicable.
  • a user terminal and/or base station can be coupled to a server to facilitate the transfer of means for performing the methods described herein.
  • various methods described herein can be provided via storage means (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc. ) , such that a user terminal and/or base station can obtain the various methods upon coupling or providing the storage means to the device.
  • storage means e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc.
  • CD compact disc
  • floppy disk etc.
  • any other suitable technique for providing the methods and techniques described herein to a device can be utilized.

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

Abstract

Certains aspects de la présente invention concernent des techniques pour améliorer la récupération de service après une terminaison d'appel dans un dispositif à double SIM. Un procédé qui peut être mis en œuvre par un équipement utilisateur (UE) comprend la réalisation d'une première procédure d'enregistrement pour établir un premier service associé à une première technologie d'accès radio, la réalisation d'une seconde procédure d'enregistrement pour établir un second service associé à une seconde technologie d'accès radio, l'initiation d'un appel vocal à l'aide de la seconde technologie d'accès radio, l'initiation de l'appel vocal comprenant l'abandon du premier service associé à la première technologie d'accès radio, la détection d'une terminaison de l'appel vocal, et la réalisation, après la détection de la terminaison de l'appel vocal, d'une procédure de recherche de cellule pour des cellules correspondant à au moins la première technologie d'accès radio pour rétablir le premier service.
PCT/CN2020/088557 2020-05-02 2020-05-02 Récupération de service améliorée après terminaison d'appel dans un dispositif à double sim WO2021223045A1 (fr)

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