WO2022011629A1 - Techniques pour maintenir une base de données de fréquences pour une sélection de cellules destinée à des dispositifs multi-sim - Google Patents

Techniques pour maintenir une base de données de fréquences pour une sélection de cellules destinée à des dispositifs multi-sim Download PDF

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Publication number
WO2022011629A1
WO2022011629A1 PCT/CN2020/102272 CN2020102272W WO2022011629A1 WO 2022011629 A1 WO2022011629 A1 WO 2022011629A1 CN 2020102272 W CN2020102272 W CN 2020102272W WO 2022011629 A1 WO2022011629 A1 WO 2022011629A1
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WIPO (PCT)
Prior art keywords
frequency
frequencies
rat
cells
database
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PCT/CN2020/102272
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English (en)
Inventor
Rishika TINDOLA
Muralidharan Murugan
Jun Deng
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Qualcomm Incorporated
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Priority to PCT/CN2020/102272 priority Critical patent/WO2022011629A1/fr
Publication of WO2022011629A1 publication Critical patent/WO2022011629A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
    • H04W8/183—Processing at user equipment or user record carrier
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for maintaining a frequency database for cell selection multi subscriber identity module (SIM) devices.
  • 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: maintain a first frequency database associated with a first subscription of the UE, the first frequency database including one or more frequencies for a first set of cells associated with the first subscription that support multi-radio access technology (RAT) dual connectivity (MR-DC) or that have a neighboring cell that supports a standalone mode of a RAT; maintain a second frequency database associated with a second subscription of the UE, the second frequency database including one or more frequencies for a second set of cells associated with the second subscription that support MR-DC or that have a neighboring cell that supports the standalone mode of the RAT; generate a third frequency database, the third frequency database including at least a first subset of the one or more frequencies for the first set of cells and a second subset of the one or more frequencies for the second set of cells; and perform a cell selection procedure based on the third frequency database.
  • RAT multi-radio access technology
  • MR-DC multi-radio access technology
  • the apparatus includes means for maintaining a first frequency database associated with a first subscription of the UE, the first frequency database including one or more frequencies for a first set of cells associated with the first subscription that support multi-radio access technology (RAT) dual connectivity (MR-DC) or that have a neighboring cell that supports a standalone mode of a RAT; means for maintaining a second frequency database associated with a second subscription of the UE, the second frequency database including one or more frequencies for a second set of cells associated with the second subscription that support MR-DC or that have a neighboring cell that supports the standalone mode of the RAT; means for generating a third frequency database, the third frequency database including at least a first subset of the one or more frequencies for the first set of cells and a second subset of the one or more frequencies for the second set of cells; and means for performing a cell selection procedure based on the third frequency database.
  • RAT multi-radio access technology
  • MR-DC multi-radio access technology
  • the method includes maintaining a first frequency database associated with a first subscription of the UE, the first frequency database including one or more frequencies for a first set of cells associated with the first subscription that support multi-radio access technology (RAT) dual connectivity (MR-DC) or that have a neighboring cell that supports a standalone mode of a RAT; maintaining a second frequency database associated with a second subscription of the UE, the second frequency database including one or more frequencies for a second set of cells associated with the second subscription that support MR-DC or that have a neighboring cell that supports the standalone mode of the RAT; generating a third frequency database, the third frequency database including at least a first subset of the one or more frequencies for the first set of cells and a second subset of the one or more frequencies for the second set of cells; and performing a cell selection procedure based on the third frequency database.
  • RAT multi-radio access technology
  • MR-DC multi-radio access technology
  • the computer-readable medium includes codes executable to maintain a first frequency database associated with a first subscription of the UE, the first frequency database including one or more frequencies for a first set of cells associated with the first subscription that support multi-radio access technology (RAT) dual connectivity (MR-DC) or that have a neighboring cell that supports a standalone mode of a RAT; maintain a second frequency database associated with a second subscription of the UE, the second frequency database including one or more frequencies for a second set of cells associated with the second subscription that support MR-DC or that have a neighboring cell that supports the standalone mode of the RAT; generate a third frequency database, the third frequency database including at least a first subset of the one or more frequencies for the first set of cells and a second subset of the one or more frequencies for the second set of cells; and perform a cell selection procedure based on the third frequency database.
  • RAT multi-radio access technology
  • MR-DC multi-radio access technology
  • the UE includes at least one antenna; and a processing system configured to: maintain a first frequency database associated with a first subscription of the UE, the first frequency database including one or more frequencies for a first set of cells associated with the first subscription that support multi-radio access technology (RAT) dual connectivity (MR-DC) or that have a neighboring cell that supports a standalone mode of a RAT; maintain a second frequency database associated with a second subscription of the UE, the second frequency database including one or more frequencies for a second set of cells associated with the second subscription that support MR-DC or that have a neighboring cell that supports the standalone mode of the RAT; generate a third frequency database, the third frequency database including at least a first subset of the one or more frequencies for the first set of cells and a second subset of the one or more frequencies for the second set of cells; and perform, via the at least one antenna, a cell selection procedure based on the third frequency database.
  • RAT multi-radio access technology
  • MR-DC multi-radio access technology
  • 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 a diagram illustrating an example of cell selection according to support for a radio access technology (RAT) , in accordance with certain aspects of the present disclosure.
  • RAT radio access technology
  • FIG. 4 is a diagram illustrating an example process performed, for example, by a UE, in accordance with certain aspects of the present disclosure.
  • FIG. 5 is a flow diagram illustrating example operations for wireless communication by a UE, 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 maintaining a frequency database for cell selection for multi-subscriber identity module (SIM) devices.
  • SIM subscriber identity module
  • a user equipment may be associated with more than one subscription, such as a first subscription and a second subscription.
  • Each subscription may be associated with its own frequency database for performing a cell selection procedure.
  • maintaining separate frequency databases for each subscription may result in certain issues when the subscriptions are associated with a same network operator, such as wasted processing and power resources as well as inconsistencies between frequency databases (e.g., one database not include certain entries) .
  • aspects of the present disclosure provide techniques for alleviating such issues by generating a new frequency database based on the frequency databases associated with each subscription. The new frequency database may then be used for cell selection for each subscription of the UE.
  • 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 UEs 120 may be configured for maintaining a frequency database for cell selection for multi-subscriber identity module (SIM) devices.
  • SIM multi-subscriber identity module
  • the UE 120a includes a cell selection module 122.
  • the cell selection module 122 may be configured to perform the operations illustrated in FIG. 5 as well as other operations disclosure herein for maintaining a frequency database for cell selection for multi-SIM devices.
  • 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.
  • the controller/processor 280 of the UE 120a includes a cell selection module 281 that may be configured to perform the operations illustrated in FIG. 5 as well as other operations disclosure herein for maintaining a frequency database for cell selection for multi-SIM devices.
  • 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
  • UE 120 may include means for performing a scan, associated with a cell selection procedure, that prioritizes a first frequency that is identified in a frequency database over a second frequency that is not identified in the frequency database, wherein the frequency database identifies one or more frequencies associated with cells that are determined to support a multi-RAT dual connectivity or that have a neighboring cell that is determined to support a standalone mode of a RAT, means for acquiring a cell on which to camp based at least in part on performing the scan, 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.
  • Dual connectivity provides communication with regard to two or more RATs.
  • One dual connectivity configuration is E-UTRAN-NR dual connectivity (EN-DC) between an Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access network (E-UTRAN) , such as 4G/LTE, and an NR network, such as 5G/NR.
  • E-UTRAN Evolved Universal Mobile Telecommunications System
  • E-UTRAN Evolved Universal Mobile Telecommunications System
  • NR network such as 5G/NR.
  • data may be received on both a 4G/LTE connection and a 5G/NR leg (e.g., on a secondary cell group split bearer) , although other configurations are possible.
  • a UE in a powering-on mode or an out-of-service mode may perform a cell selection procedure with regard to a plurality of cells.
  • the plurality of cells may include cells that support EN-DC and cells that support only LTE.
  • the UE may select a cell that supports only LTE (e.g., due to a stronger signal of the cell) .
  • the UE may not display an icon that indicates 5G coverage, which may be confusing to a user.
  • the UE may communicate at a lower throughput and/or a lower data rate.
  • the UE when camped on an LTE frequency that does not support EN-DC, the UE must first be handed over to a frequency that supports EN-DC in order to initiate EN-DC, thereby delaying communications of the UE in EN-DC.
  • Some techniques and apparatuses described herein improve a likelihood that a UE will select a cell, during a cell selection procedure, that supports EN-DC or has a neighboring cell that supports NR standalone mode.
  • the UE may perform a scan, associated with the cell selection procedure, that prioritizes frequencies that are identified in a frequency database.
  • the frequency database may identify one or more frequencies associated with cells that are determined to support EN-DC or that have a neighboring cell that is determined to support NR standalone mode. In this way, the UE may bias the cell selection procedure towards selecting a cell that is likely to support EN-DC or a cell from which the UE is likely to be able to reselect to a neighboring cell that supports NR standalone mode.
  • Fig. 3 is a diagram illustrating an example 300 of cell selection according to support for a radio access technology.
  • example 300 may illustrate an example cell selection procedure performed by a UE 120.
  • the UE 120 may perform the cell selection procedure to determine a cell, of a plurality of cells, on which the UE 120 is to camp.
  • the plurality of cells may be included in the same wireless network (e.g., wireless network 100 and/or another wireless network) , may be included in a different wireless network, and/or the like.
  • the plurality of cells may be implemented by the same BS (e.g., BS 110) and/or may be implemented by different BSs.
  • the cell selection procedure may be biased such that the UE 120 is more likely to select a cell (e.g., a primary cell) that supports multi-RAT dual connectivity with a first RAT and a second RAT.
  • the first RAT may be an LTE RAT and the second RAT may be an NR RAT. That is, the dual connectivity may be EN-DC.
  • example 300 is described in terms of EN-DC, example 300 may also apply to another multi-RAT dual connectivity mode with a first RAT other than LTE and/or a second RAT other than NR.
  • the first RAT and the second RAT may both be an NR RAT (e.g., NR dual connectivity (NR-DC) )
  • the first RAT may be an NR RAT
  • the second RAT may be an LTE RAT (e.g., NR-E-UTRA dual connectivity (NE-DC) )
  • the dual connectivity may be a next generation (NG) radio access network (RAN) E-UTRA-NR dual connectivity (NGEN-DC) .
  • NG next generation
  • RAN radio access network
  • NGEN-DC next generation
  • the cell selection procedure may be biased such that the UE 120 is more likely to select a cell (e.g., a primary cell) having a neighboring cell that supports a standalone mode of a RAT.
  • the standalone mode of the RAT may be an NR standalone mode.
  • example 300 is described in terms of NR standalone mode, example 300 may also apply to another RAT standalone mode.
  • the multi-RAT dual connectivity may be NR-DC on a first frequency range (FR1) , such as a sub-6 GHz frequency range, and a second frequency range (FR2) , such as a millimeter wave (mmW) frequency range, and the standalone mode of the RAT may be an FR2 standalone mode.
  • FR1 first frequency range
  • FR2 second frequency range
  • mmW millimeter wave
  • the UE 120 may perform a scan associated with a cell selection procedure. For example, the UE 120 may perform the scan when the UE 120 is in a powering-on mode, an out-of-service mode, and/or the like.
  • the scan may be a frequency list scan or a band scan. According to the frequency list scan, the UE 120 may scan frequencies for a PSS and/or an SSS of a cell. According to the band scan, the UE 120 may scan frequency bands for a PSS and/or an SSS of a cell.
  • the UE 120 may perform a frequency list scan and/or a band scan according to one or more frequencies that are identified by an acquisition database stored by the UE 120 and/or according to one or more frequencies that are identified by a frequency database (e.g., a list, a table, or another data structure) stored by the UE 120 (e.g., in a persistent memory of the UE 120) .
  • a frequency database e.g., a list, a table, or another data structure
  • the frequency database may identify one or more frequencies associated with cells that are determined to support a multi-RAT dual connectivity (e.g., EN-DC or NR-DC on FR1 and FR2) or that are determined to have a neighboring cell that is determined to support a standalone mode of a RAT (e.g., NR standalone mode or FR2 standalone mode) .
  • a multi-RAT dual connectivity e.g., EN-DC or NR-DC on FR1 and FR2
  • a standalone mode of a RAT e.g., NR standalone mode or FR2 standalone mode
  • the frequency database may identify an E-UTRA absolute radio frequency channel number (EARFCN) of a frequency, a public land mobile network (PLMN) associated with the frequency, a timestamp, and/or an indicator of whether the frequency is associated with the multi-RAT dual connectivity (e.g., NR non-standalone (NSA) ) or the standalone mode of the RAT (e.g., NR standalone (SA) ) .
  • the timestamp may indicate a time when the frequency was added to the frequency database, such as a time when the UE 120 last camped on a cell associated with the frequency.
  • the UE 120 or another UE may determine that a cell supports the multi-RAT dual connectivity or that a cell has a neighboring cell that supports the standalone mode of the RAT. In some aspects, the UE 120 or the other UE may determine that a cell is configured with at least one of a measurement object (e.g., an NR measurement object) or a secondary cell group for the multi-RAT dual connectivity, to thereby determine that the cell supports the multi-RAT dual connectivity. In some aspects, the UE 120 or the other UE may determine that a cell is indicated to support the multi-RAT dual connectivity by system information, to thereby determine that the cell supports the multi-RAT dual connectivity.
  • a measurement object e.g., an NR measurement object
  • the UE 120 or the other UE may receive, from the cell, a system information block (SIB) type-2 (SIB2) having an upper layer indication (ULI, such as ULI_r15) that indicates whether the cell is associated with the multi-RAT dual connectivity coverage (e.g., indicates whether the cell is associated with NR coverage) .
  • SIB system information block
  • the UE 120 or the other UE may be configured with, or may generate, a SIB type-24 (SIB24) .
  • SIB24 SIB type-24
  • the UE 120 or the other UE while camped on a cell of a first RAT, may identify (e.g., in connection with a cell search procedure) an inter-RAT neighboring cell of a second RAT.
  • the frequency database may additionally, or alternatively, identify one or more frequencies according to one or more criteria other than support for a multi-RAT dual connectivity or support for a standalone mode of a RAT.
  • the one or more criteria may include a bandwidth of a cell, a maximum quantity of layers supported by a cell, a maximum carrier aggregation capability (e.g., a maximum quantity of component carriers and a total bandwidth) of a cell, a throughput of a cell (e.g., a throughput under a particular condition) , and/or the like.
  • information regarding the one or more criteria may be determined by the UE 120 or another UE (e.g., the information may be crowdsourced) .
  • the UE 120 or the other UE may determine that a cell supports the multi-RAT dual connectivity or has a neighboring cell that supports the standalone mode of the RAT, and may update a respective frequency database to identify a frequency associated with the cell.
  • the UE 120 or the other UE may provide information identifying frequencies in a respective frequency database to a server (e.g., associated with a network serving the UE 120 or the other UE) .
  • the server may aggregate identified frequencies to thereby determine one or more crowdsourced frequency lists.
  • the server may aggregate identified frequencies according to a PLMN, according to a geographic area (e.g., a geo-polygon, a city, a state, a country, and/or the like) , according to a location, and/or the like.
  • the server may provide a frequency list to the UE 120 for inclusion in the frequency database of the UE 120.
  • the frequency list provided to the UE 120 may identify one or more frequencies that are particular to a characteristic and/or a parameter of the UE 120.
  • the frequency list may identify one or more frequencies associated with a PLMN of the UE 120, a location of the UE 120, and/or the like.
  • the UE 120 may update the frequency database to remove one or more frequencies from the frequency database. For example, the UE 120 may remove a frequency from the frequency database based at least in part on a determination that a quantity of frequencies identified in the frequency database satisfies a threshold value. As another example, the UE 120 may remove a frequency from the frequency database based at least in part on a determination that the frequency is associated with a timestamp (e.g., a timestamp indicating a time at which the UE 120 last camped on a cell associated with the frequency) that satisfies a threshold value (e.g., the timestamp indicates a time that is older than a current time by more than the threshold value) . In some aspects, the threshold value may be particular to a location of the UE 120 (e.g., a location of the UE 120 in a particular geo-polygon, a particular country, and/or the like) .
  • a timestamp e.g., a timestamp
  • the UE 120 may determine that a particular frequency is not to be removed from the frequency database based at least in part on a determination that the frequency is “sticky. ”
  • a frequency may be characterized as sticky based at least in part on a determination that the frequency is associated with a location at which the UE 120 was located for a threshold amount of time and/or for a threshold quantity of times.
  • a location of the UE 120 may be based at least in part on a wireless network (e.g., according to a basic service set identifier (BSSID) ) connection of the UE 120, another wireless connection (e.g., Bluetooth) of the UE 120, sensor (e.g., an inertial sensor) data of the UE 120, and/or the like.
  • BSSID basic service set identifier
  • the UE 120 may update the frequency database by performing another scan (e.g., a frequency scan or a frequency band scan) .
  • another scan e.g., a frequency scan or a frequency band scan
  • the UE 120 may perform the other scan periodically, such as at regular intervals or upon determining an occurrence of a particular event.
  • the UE 120 may prioritize one or more frequencies identified in the frequency database over one or more frequencies that are not identified in the frequency database. For example, when the scan is a frequency list scan, the UE 120 may prioritize one or more frequencies identified in the frequency database over one or more frequencies identified in the acquisition database. As another example, when the scan is a band scan, the UE 120 may prioritize one or more frequency bands that map to one or more frequencies identified in the frequency database over one or more frequency bands that map to one or more frequencies identified in the acquisition database.
  • the UE 120 may prioritize frequencies identified in the frequency database after frequencies identified by other frequency lists of the UE 120 and/or may prioritize frequencies identified in the acquisition database before frequencies identified by other frequency lists of the UE 120.
  • the other frequency lists may include a frequency list that is dynamically provided by a manufacturer of the UE 120, a frequency list that is provisioned by a network operator of a network associated with the UE 120, and/or the like.
  • the UE 120 may determine respective energy estimates (e.g., received signal strength indicator (RSSI) values) for the frequencies identified by the frequency database and the frequencies identified by the acquisition database.
  • the UE 120 may determine a first frequency having a highest energy estimate of the frequencies identified by the frequency database, and may determine a second frequency having a highest energy estimate of the frequencies identified by the acquisition database.
  • the UE 120 may prioritize the first frequency over the second frequency based at least in part on prioritizing frequencies that are identified by the frequency database over frequencies that are not identified by the frequency database.
  • the UE 120 may filter the frequencies identified by the frequency database and the frequencies identified by the acquisition database prior to determining energy estimates (e.g., prior to the scan) .
  • the UE 120 may filter out frequencies that are not associated with a PLMN (e.g., a registered PLMN, an equivalent PLMN, and/or the like) capable of serving the UE 120.
  • the UE 120 may determine the first frequency and the second frequency from frequencies in the frequency database and the acquisition database that are associated with a highest priority RAT for the UE 120 and/or a highest priority PLMN for the UE 120.
  • the UE 120 may select a frequency for cell acquisition (e.g., in connection with the cell selection procedure) based at least in part on performing the scan. For example, the UE 120 may select the first frequency based at least in part on a determination that the energy estimate associated with the first frequency is within a particular range of an energy estimate associated with the second frequency. That is, the UE 120 may select the first frequency based at least in part on a determination that the energy estimate associated with the first frequency is greater than the energy estimate associated with the second frequency reduced by an adjustment value. Otherwise, the UE 120 may select the second frequency.
  • the adjustment value may be particular to a location of the UE 120 (e.g., a location of the UE 120 in a particular geo-polygon, a particular country, and/or the like) .
  • the UE 120 may camp on a cell associated with the selected frequency. That is, the UE 120 may acquire a cell on the selected frequency and camp on the acquired cell.
  • cell acquisition on the selected frequency may fail (e.g., because no cell is detected on the selected frequency, a SIB read for a cell detected on the selected frequency fails, a cell detected on the selected frequency is unsuitable, and/or the like) .
  • the UE 120 may discard the selected frequency (e.g., the first frequency or the second frequency) and may select another frequency for cell acquisition.
  • the UE 120 may determine, excluding the discarded frequency, a frequency having a highest energy estimate of the frequencies identified by the frequency database, and a frequency having a highest energy estimate of the frequencies identified by the acquisition database, as described above. Accordingly, the UE 120 may select one of the frequencies identified and attempt cell acquisition on the selected frequency, as described above. The UE 120 may continue this process until the UE 120 is able to acquire and camp on a cell.
  • Fig. 3 is provided as an example. Other examples may differ from what is described with respect to Fig. 3.
  • Fig. 4 is a diagram illustrating an example process 400 performed, for example, by a UE, in accordance with various aspects of the present disclosure.
  • Example process 400 is an example where the UE (e.g., UE 120, and/or the like) performs operations associated with cell selection according to support for a RAT.
  • the UE e.g., UE 120, and/or the like
  • process 400 may include performing a scan, associated with a cell selection procedure, that prioritizes a first frequency that is identified in a frequency database over a second frequency that is not identified in the frequency database, wherein the frequency database identifies one or more frequencies associated with cells that are determined to support a multi-RAT dual connectivity or that have a neighboring cell that is determined to support a standalone mode of a RAT (block 410) .
  • the UE may perform a scan, associated with a cell selection procedure, that prioritizes a first frequency that is identified in a frequency database over a second frequency that is not identified in the frequency database, as described above.
  • the frequency database identifies one or more frequencies associated with cells that are determined to support a multi-RAT dual connectivity or that have a neighboring cell that is determined to support a standalone mode of a RAT.
  • process 400 may include acquiring a cell on which to camp based at least in part on performing the scan (block 420) .
  • the UE e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller/processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, and/or the like
  • Process 400 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.
  • the multi-RAT dual connectivity is EN-DC and the standalone mode of the RAT is NR standalone mode.
  • the scan is performed in a powering-on mode or an out-of-service mode of the UE.
  • the scan is at least one of a frequency list scan or a band scan.
  • the scan is a frequency list scan, and the scan prioritizes the one or more frequencies identified in the frequency database over one or more frequencies identified in an acquisition database.
  • the scan is a band scan, and the scan prioritizes one or more frequency bands that map to the one or more frequencies identified in the frequency database over one or more frequency bands that map to one or more frequencies identified in an acquisition database.
  • performing the scan includes determining respective energy estimates of the one or more frequencies identified in the frequency database and one or more frequencies identified in an acquisition database.
  • the first frequency is prioritized over the second frequency based at least in part on a determination that an energy estimate associated with the first frequency is within a particular range of an energy estimate associated with the second frequency.
  • the frequency database identifies one or more of an EARFCN of a frequency, a PLMN identifier of the frequency, a timestamp indicating a time when the frequency is added to the frequency database, or an indicator of whether the frequency is associated with the multi-RAT dual connectivity or the standalone mode of the RAT.
  • process 400 includes determining that a particular cell supports the multi-RAT dual connectivity or has a neighboring cell that supports the standalone mode of the RAT, and updating the frequency database to identify a frequency associated with the particular cell.
  • the particular cell is determined to support the multi-RAT dual connectivity or to have the neighboring cell that supports the standalone mode of the RAT based at least in part on at least one of a determination that the particular cell is indicated to support the multi-RAT dual connectivity by system information, a determination that the particular cell has an inter-RAT neighboring cell, or a determination that the particular cell is configured with at least one of a measurement object or a secondary cell group for the multi-RAT dual connectivity.
  • process 400 includes periodically performing another scan to identify a frequency that is to be identified in the frequency database.
  • process 400 includes updating the frequency database to remove a frequency based at least in part on at least one of a determination that a quantity of the one or more frequencies identified in the frequency database satisfies a threshold value, or a determination that the frequency is associated with a timestamp, indicating a time when the frequency is added to the frequency database, that satisfies a threshold value.
  • updating the frequency database to remove the frequency includes determining that another frequency is not to be removed when updating the frequency database based at least in part on a determination that the other frequency is associated with a location at which the UE is located for at least one of a threshold amount of time or a threshold quantity of times.
  • the one or more frequencies identified in the frequency database are associated with a location of the UE. In a fifteenth aspect, alone or in combination with one or more of the first through fourteenth aspects, the one or more frequencies identified in the frequency database are identified by a plurality of UEs.
  • the UE 120 may perform a scan associated with a cell selection procedure to determine a cell to camp on.
  • the UE may perform the scan based on a frequency database, also known as a fingerprint database, to prioritize cell acquisition on frequencies that are included in this frequency database, as noted above.
  • the frequency database may identify one or more frequencies associated with cells that support a multi-RAT dual connectivity (e.g., EN-DC or NR-DC on FR1 and FR2) or that have a neighboring cell that supports a standalone mode of a RAT (e.g., NR standalone mode or FR2 standalone mode) .
  • a multi-RAT dual connectivity e.g., EN-DC or NR-DC on FR1 and FR2
  • a neighboring cell e.g., NR standalone mode or FR2 standalone mode
  • the frequency database may identify an E-UTRA absolute radio frequency channel number (EARFCN) of a frequency, a public land mobile network (PLMN) associated with the frequency, a timestamp, and/or an indicator of whether the frequency is associated with the multi-RAT dual connectivity (e.g., NR non-standalone (NSA) ) or the standalone mode of the RAT (e.g., NR standalone (SA) ) .
  • the timestamp may indicate a time when the frequency was added to the frequency database, such as a time when the UE 120 last camped on a cell associated with the frequency.
  • two different subscriptions may be supported on a same device, such as the UE 120, and may be based on two separate subscriber identification module (SIMs) .
  • SIMs subscriber identification module
  • Such devices may be known as multi-SIM (MSIM) devices.
  • MSIM subscriber identification module
  • These subscriptions could be on the same radio network or different radio networks and could have different subscription profiles and Quality of Service (QOS) requirements.
  • 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.
  • a different frequency database may be generated and maintained for each subscription.
  • a first subscription of the UE 120 may be associated with a first frequency database and a second subscription of the UE 120 may be associated with a second frequency database.
  • the UE 120 may separately scan frequencies in the first frequency database and the second database to acquire a cell to camp on for each of the subscriptions.
  • frequency databases may be missing one or more frequency entries associated with cells of the network operator, which may lead to delays in the UE selecting an optimal cell to camp on.
  • having to generate and maintain separate frequency databases for each subscription of the UE may result in the wasting of processing resources (e.g., the UE having to generate two frequency databases that may include the same entries) and unnecessary power consumption at the UE.
  • aspects of the present disclosure provide techniques for alleviating these issues whereby, when performing a cell selection procedure, the subscriptions of the UE may share a frequency database. For example, in some cases, the UE may generate a third frequency database based on the first frequency database associated with the first subscription and the second frequency database associated with second subscription and use the third frequency database when performing the cell selection procedure associated with each subscription.
  • FIG. 5 is a flow diagram illustrating example operations 500 for wireless communication, in accordance with certain aspects of the present disclosure.
  • the operations 500 may be performed, for example, by UE (e.g., such as a UE 120a in the wireless communication network 100) .
  • the UE may be a multi-SIM device associated with multiple subscriptions, as described above.
  • Operations 500 may be implemented as software components that are executed and run on a processing system including one or more processors (e.g., controller/processor 280 of FIG. 2) .
  • the transmission and reception of signals by the UE in operations 500 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 500 may begin, at 502, by maintaining a first frequency database associated with a first subscription of the UE, the first frequency database including one or more frequencies for a first set of cells associated with the first subscription that support multi-radio access technology (RAT) dual connectivity (MR-DC) or that have a neighboring cell that supports a standalone mode of a RAT.
  • RAT multi-radio access technology
  • MR-DC multi-radio access technology dual connectivity
  • the UE maintains a second frequency database associated with a second subscription of the UE, the second frequency database including one or more frequencies for a second set of cells associated with the second subscription that support MR-DC or that have a neighboring cell that supports a standalone mode of the RAT.
  • the UE generates a third frequency database, the third frequency database including at least a first subset of the one or more frequencies for the first set of cells and a second subset of the one or more frequencies for the second set of cells.
  • the UE performs a cell selection procedure based on the third frequency database.
  • a multi-SIM UE may maintain a first frequency database associated with a first subscription of the UE and a second frequency database associated with a second subscription of the UE.
  • the first frequency database may include one or more frequencies for a first set of cells associated with the first subscription that support multi-radio access technology (RAT) dual connectivity (MR-DC) or that have a neighboring cell that supports a standalone mode of a RAT.
  • the second frequency database may include one or more frequencies for a second set of cells associated with the second subscription that support MR-DC or that have a neighboring cell that supports a standalone mode of the RAT.
  • the first subscription may be associated with a long term evolution (LTE) RAT and the second subscription is associated with a non-standalone fifth generation new radio (5G NR) RAT.
  • the RAT associated with the standalone mode may comprise a 5G NR RAT.
  • the first subscription and the second subscription may both be associated with a standalone 5G NR RAT, as explained below.
  • MR-DC may include configurations such as E-UTRA–NR Dual Connectivity (EN-DC) , new radio dual connectivity (NR-DC) , NG-RAN–E-UTRA Dual Connectivity (NGEN-DC) , and NR–E-UTRA dual connectivity (NE-DC) .
  • Cells that support MR-DC may include, for example, long term evolution (LTE) cells that support EN-DC in which the UE may be connected to an LTE eNB and to 5G NR gNB.
  • LTE long term evolution
  • the 5G NR gNB may be operating in a non-standalone configuration whereby the LTE eNB is a master node (MeNB) acting as an anchor for all signaling and mobility management for a secondary node gNB (SgNB) .
  • the first frequency database and second frequency database may include LTE cells/eNBs capable of EN-DC with one or more 5G NR cells/gNBs.
  • the first frequency database and second frequency database may include cells that have a neighboring cell that supports the standalone mode of a RAT.
  • these cells may include LTE cells/eNBs that have a neighboring cell that supports the standalone mode of a RAT.
  • the neighboring cell may include a 5G NR cell/gNB that operates in a standalone mode of the 5G NR RAT whereby both signaling and mobility management may be handled by a 5G NR core network.
  • the UE may perform a cell selection procedure to determine a cell to camp on for one or more of the first subscription or the second subscription.
  • Such cell selection procedure may be based on a third frequency database generated by the UE that includes at least a first subset of the one or more frequencies for the first set of cells of the first frequency database and a second subset of the one or more frequencies for the second set of cells of the second frequency database.
  • the UE may generate the third frequency database by selecting certain frequencies from each of the first frequency database and the second frequency database for the first and second subsets based on one or more criteria. For example, in some cases, the UE may select, for the first subset, frequencies from the one or more frequencies for the first set of cells that belong to a registered public land mobile network (PLMN) or an equivalent PLMN. Similarly, in some cases, the UE may select, for the second subset, frequencies from the one or more frequencies for the second set of cells that belong to the registered PLMN or the equivalent PLMN.
  • PLMN public land mobile network
  • the UE may select, for the second subset, frequencies from the one or more frequencies for the second set of cells that belong to the registered PLMN or the equivalent PLMN.
  • the UE may generate the third frequency database by excluding (e.g., pruning) frequencies from the one or more frequencies for the first set of cells that belong to a forbidden PLMN and excluding frequencies from the one or more frequencies for the second set of cells that belong to the forbidden PLMN.
  • the UE may exclude any frequencies that belong to a forbidden PLMN from being selected for the first subset of frequencies or the second subset of frequencies in the third frequency database.
  • the UE may still consider the frequencies that belong to the forbidden PLMN if the UE is unable to determine a cell to camp on while performing a full band scan. That is, if the UE is unable to determine a cell to camp on after performing a full band scan, the UE may consider the frequencies that below to the forbidden PLMN and may try to camp on a cell associated with one or more of these frequencies.
  • the UE may still select frequencies that belong to a forbidden PLMN under certain circumstances. For example, in some cases, if the frequencies belong to a forbidden PLMN and the forbidden PLMN is part of a shared PLMN, the UE may select such “forbidden” frequencies for the first subset and second subset so long as the shared PLMN also includes at least one available PLMN (e.g., a PLMN that is not forbidden to the UE) .
  • a PLMN that is not forbidden to the UE
  • the UE may generate the third frequency database bay selecting, for the first subset, frequencies from the one or more frequencies for the first set of cells that belong to a shared PLMN, wherein the shared PLMN includes at least one of available PLMN and/or one forbidden PLMN.
  • the UE may also select, for the second subset, frequencies from the one or more frequencies for the second set of cells that belong to the shared PLMN.
  • the UE may perform a cell selection procedure to determine a cell to camp on based on the third frequency database.
  • the UE may perform the cell selection procedure when the UE is operating in one or more of a powering-on mode, an out-of-service mode, a RLF mode, a redirection mode, and/or the like.
  • performing the cell selection may include performing a scan procedure based on, or using, the third frequency database.
  • the scan procedure may include a frequency list scan procedure or a band scan procedure, as described above.
  • the UE may also perform a scan on other frequency lists, e.g., dynamically provided by OEM, operator provisioned, may be scanned before or after performing the scan based on the third frequency database.
  • the UE may scan one or more of the frequencies included within the third frequency database and one or more frequencies included within an acquisition database, as explained above.
  • the UE may determine which frequency from the third frequency database and/or the acquisition database to attempt acquisition on based on a sorting algorithm involving energy estimates corresponding to frequencies included in each database.
  • the UE may perform a scan for each frequency included in the third frequency database and acquisition database to obtain energy estimates for each of the scanned frequencies.
  • the UE may determine, based on the third frequency database, one or more first energy estimates associated with the one or more frequencies for the first subset and the one or more frequencies for the second subset.
  • the UE may determine, based on the acquisition database, one or more second energy estimates associated with one or more frequencies identified in the acquisition database.
  • the UE may determine a first maximum energy estimate of the one or more first energy estimates.
  • the first maximum energy estimate may be associated with a first frequency of at least one of the first subset or the second subset.
  • the UE may determine a second maximum energy estimate of the one or more second energy estimates.
  • the second maximum energy estimate may be associated with a second frequency of the one or more frequencies identified in the acquisition database.
  • the UE may apply an offset or adjustment value to the first maximum energy estimate or the second maximum energy estimate, as described above.
  • the offset may be configurable (e.g., by the network) and may be particular to a location of the UE 120 (e.g., a location of the UE in a particular geo-polygon, a particular country, and/or the like) .
  • the offset may allow the UE to select a first cell that has a lower energy estimate as compared to second cell that has a higher energy estimate when, for example, the first cell is more suited for the UE (e.g., the first cell is a 5G NR gNB while the second cell is an LTE eNB) .
  • the UE may then perform a cell acquisition procedure based on the offset and one of the first frequency or the second frequency. For example, in some cases, the UE may perform the cell acquisition procedure for the first frequency when, based on the applied offset, the first maximum energy estimate associated with the first frequency is greater than the second maximum energy estimate associated with the second frequency. In other cases, the UE may perform the cell acquisition procedure for the second frequency when, based on the applied offset, the first maximum energy estimate associated with the first frequency is less than the second maximum energy estimate associated with the second frequency.
  • 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. 5, as well as other operations described herein for maintaining a frequency database for cell selection for multi-SIM devices.
  • 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. 5, or other operations for performing the various techniques discussed herein for maintaining a frequency database for cell selection for multi-SIM devices.
  • computer-readable medium/memory 612 stores code 614 for maintaining; code 616 for generating; code 618 for performing; code 620 for selecting; code 622 for excluding; and code 624 for determining.
  • code 614 for maintaining may include code for maintain a first frequency database associated with a first subscription of the UE, the first frequency database including one or more frequencies for a first set of cells associated with the first subscription that support multi-radio access technology (RAT) dual connectivity (MR-DC) or that have a neighboring cell that supports a standalone mode of a RAT. Additionally, in some cases, code 614 for maintaining may include code for maintaining a second frequency database associated with a second subscription of the UE, the second frequency database including one or more frequencies for a second set of cells associated with the second subscription that support MR-DC or that have a neighboring cell that supports a standalone mode of the RAT.
  • RAT multi-radio access technology
  • MR-DC multi-radio access technology
  • code 614 for maintaining may include code for maintaining a second frequency database associated with a second subscription of the UE, the second frequency database including one or more frequencies for a second set of cells associated with the second subscription that support MR-DC or that have a neighboring cell that supports a standalone mode
  • code 616 for generating may include code for generating a third frequency database, the third frequency database including at least a first subset of the one or more frequencies for the first set of cells and a second subset of the one or more frequencies for the second set of cells.
  • code 618 for performing may include code for performing a cell selection procedure based on the third frequency database. Additionally, in some cases, code 618 for performing may include code for performing a scan procedure based on the third frequency database.
  • code 620 for selecting may include code for selecting, for the first subset, frequencies from the one or more frequencies for the first set of cells that belong to a registered public land mobile network (PLMN) or an equivalent PLMN. Additionally, in some cases, code 620 for selecting may include code for selecting, for the second subset, frequencies from the one or more frequencies for the second set of cells that belong to the registered PLMN or the equivalent PLMN. Additionally, in some cases, code 620 for selecting may include code for selecting, for the first subset, frequencies from the one or more frequencies for the first set of cells that belong to a shared PLMN, wherein the shared PLMN includes at least one of available PLMN or one forbidden PLMN. Additionally, in some cases, code 620 for selecting may include code for selecting, for the second subset, frequencies from the one or more frequencies for the second set of cells that belong to the shared PLMN.
  • PLMN public land mobile network
  • code 620 for selecting may include code for selecting, for the second subset, frequencies from the one or more frequencies for the
  • code 622 for excluding may include code for excluding frequencies from the one or more frequencies for the first set of cells that belong to a forbidden PLMN. Additionally, in some cases, code 622 for excluding may include code for excluding frequencies from the one or more frequencies for the second set of cells that belong to the forbidden PLMN.
  • code 624 for determining may include code for determining, based on the third frequency database, one or more first energy estimates associated with the one or more frequencies for the first subset and the one or more frequencies for the second subset. Additionally, in some cases, code 624 for determining may include code for determining, based on an acquisition database, one or more second energy estimates associated with one or more frequencies identified in the acquisition database. Additionally, in some cases, code 624 for determining may include code for determining a first maximum energy estimate of the one or more first energy estimates, the first maximum energy estimate being associated with a first frequency of at least one of the first subset or the second subset. Additionally, in some cases, code 624 for determining may include code for determining a second maximum energy estimate of the one or more second energy estimates, the second maximum energy estimate being associated with a second frequency of the one or more frequencies identified in the acquisition database.
  • code 618 for performing may include code for performing a cell acquisition procedure based on an offset and one of the first frequency or the second frequency. Additionally, in some cases, code 618 for performing may include code for performing the cell acquisition procedure associated with the first frequency when the first maximum energy estimate associated with the first frequency is greater than the second maximum energy estimate associated with the second frequency. Additionally, in some cases, code 618 for performing may include code for performing the cell acquisition procedure associated with the second frequency when the first maximum energy estimate associated with the first frequency is less than the second maximum energy estimate associated with the second frequency.
  • the processor 604 includes circuitry configured to implement the code stored in the computer-readable medium/memory 612.
  • the processor 604 includes circuitry 626 for maintaining; circuitry 628 for generating; circuitry 630 for performing; circuitry 632 for selecting; circuitry 634 for excluding; and circuitry 636 for determining.
  • circuitry 626 for maintaining may include circuitry for maintain a first frequency database associated with a first subscription of the UE, the first frequency database including one or more frequencies for a first set of cells associated with the first subscription that support multi-radio access technology (RAT) dual connectivity (MR-DC) or that have a neighboring cell that supports a standalone mode of a RAT. Additionally, in some cases, circuitry 626 for maintaining may include circuitry for maintaining a second frequency database associated with a second subscription of the UE, the second frequency database including one or more frequencies for a second set of cells associated with the second subscription that support MR-DC or that have a neighboring cell that supports a standalone mode of the RAT.
  • RAT multi-radio access technology
  • MR-DC multi-radio access technology
  • circuitry 626 for maintaining may include circuitry for maintaining a second frequency database associated with a second subscription of the UE, the second frequency database including one or more frequencies for a second set of cells associated with the second subscription that support MR-DC or that have a neighboring cell
  • circuitry 628 for generating may include circuitry for generating a third frequency database, the third frequency database including at least a first subset of the one or more frequencies for the first set of cells and a second subset of the one or more frequencies for the second set of cells.
  • circuitry 630 for performing may include circuitry for performing a cell selection procedure based on the third frequency database. Additionally, in some cases, circuitry 630 for performing may include circuitry for performing a scan procedure based on the third frequency database.
  • circuitry 632 for selecting may include circuitry for selecting, for the first subset, frequencies from the one or more frequencies for the first set of cells that belong to a registered public land mobile network (PLMN) or an equivalent PLMN. Additionally, in some cases, circuitry 632 for selecting may include circuitry for selecting, for the second subset, frequencies from the one or more frequencies for the second set of cells that belong to the registered PLMN or the equivalent PLMN. Additionally, in some cases, circuitry 632 for selecting may include circuitry for selecting, for the first subset, frequencies from the one or more frequencies for the first set of cells that belong to a shared PLMN, wherein the shared PLMN includes at least one of available PLMN or one forbidden PLMN. Additionally, in some cases, circuitry 632 for selecting may include circuitry for selecting, for the second subset, frequencies from the one or more frequencies for the second set of cells that belong to the shared PLMN.
  • PLMN public land mobile network
  • circuitry 632 for selecting may include circuitry for selecting, for the second subset
  • circuitry 634 for excluding may include circuitry for excluding frequencies from the one or more frequencies for the first set of cells that belong to a forbidden PLMN. Additionally, in some cases, circuitry 634 for excluding may include circuitry for excluding frequencies from the one or more frequencies for the second set of cells that belong to the forbidden PLMN.
  • circuitry 636 for determining may include circuitry for determining, based on the third frequency database, one or more first energy estimates associated with the one or more frequencies for the first subset and the one or more frequencies for the second subset. Additionally, in some cases, circuitry 636 for determining may include circuitry for determining, based on an acquisition database, one or more second energy estimates associated with one or more frequencies identified in the acquisition database. Additionally, in some cases, circuitry 636 for determining may include circuitry for determining a first maximum energy estimate of the one or more first energy estimates, the first maximum energy estimate being associated with a first frequency of at least one of the first subset or the second subset. Additionally, in some cases, circuitry 636 for determining may include circuitry for determining a second maximum energy estimate of the one or more second energy estimates, the second maximum energy estimate being associated with a second frequency of the one or more frequencies identified in the acquisition database.
  • circuitry 630 for performing may include circuitry for performing a cell acquisition procedure based on an offset and one of the first frequency or the second frequency. Additionally, in some cases, circuitry 630 for performing may include circuitry for performing the cell acquisition procedure associated with the first frequency when the first maximum energy estimate associated with the first frequency is greater than the second maximum energy estimate associated with the second frequency. Additionally, in some cases, circuitry 630 for performing may include circuitry for performing the cell acquisition procedure associated with the second frequency when the first maximum energy estimate associated with the first frequency is less than the second maximum energy estimate associated with the second frequency.
  • 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. 5, as well as other operations described herein for maintaining a frequency database for cell selection for multi-subscriber identity module (SIM) devices.
  • SIM multi-subscriber identity module
  • 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)
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  • Computer Security & Cryptography (AREA)
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Abstract

Certains aspects de la présente divulgation concernent des techniques pour maintenir une base de données de fréquence pour une sélection de cellules destinée à des dispositifs de module d'identité multi-abonné (SIM). Un procédé qui peut être mis en œuvre par un équipement utilisateur (UE) consiste à maintenir une première base de données de fréquences associée à un premier abonnement de l'UE, à maintenir une deuxième base de données de fréquences associée à un second abonnement de l'UE, à générer une troisième base de données de fréquences comprenant au moins un premier sous-ensemble d'une ou de plusieurs fréquences pour un premier ensemble de cellules associées au premier abonnement et un second sous-ensemble d'une ou de plusieurs fréquences pour un second ensemble de cellules associées au second abonnement, et à réaliser une procédure de sélection de cellules sur la base de la troisième base de données de fréquences.
PCT/CN2020/102272 2020-07-16 2020-07-16 Techniques pour maintenir une base de données de fréquences pour une sélection de cellules destinée à des dispositifs multi-sim WO2022011629A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140045489A1 (en) * 2011-05-03 2014-02-13 Nicolas Josso Reference Clock Management
CN105453638A (zh) * 2013-08-07 2016-03-30 瑞典爱立信有限公司 针对包括自主封闭订户组csg小区搜索和重选的小区重选过程的对测量时间的要求的配置
US20160241722A1 (en) * 2015-02-15 2016-08-18 Lenovo (Beijing) Co., Ltd. Information Processing Method, Electronic Apparatus and Server
WO2019064274A1 (fr) * 2017-09-28 2019-04-04 Telefonaktiebolaget Lm Ericsson (Publ) Sélection de fréquence ou de technologie d'accès radio (rat) basée sur la disponibilité de tranches

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140045489A1 (en) * 2011-05-03 2014-02-13 Nicolas Josso Reference Clock Management
CN105453638A (zh) * 2013-08-07 2016-03-30 瑞典爱立信有限公司 针对包括自主封闭订户组csg小区搜索和重选的小区重选过程的对测量时间的要求的配置
US20160241722A1 (en) * 2015-02-15 2016-08-18 Lenovo (Beijing) Co., Ltd. Information Processing Method, Electronic Apparatus and Server
WO2019064274A1 (fr) * 2017-09-28 2019-04-04 Telefonaktiebolaget Lm Ericsson (Publ) Sélection de fréquence ou de technologie d'accès radio (rat) basée sur la disponibilité de tranches

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