WO2021138826A1 - Sélection de cellule en fonction d'un support pour une technologie d'accès radio - Google Patents

Sélection de cellule en fonction d'un support pour une technologie d'accès radio Download PDF

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Publication number
WO2021138826A1
WO2021138826A1 PCT/CN2020/070819 CN2020070819W WO2021138826A1 WO 2021138826 A1 WO2021138826 A1 WO 2021138826A1 CN 2020070819 W CN2020070819 W CN 2020070819W WO 2021138826 A1 WO2021138826 A1 WO 2021138826A1
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WIPO (PCT)
Prior art keywords
frequency
rat
scan
cell
database
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PCT/CN2020/070819
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English (en)
Inventor
Satashu Goel
Arvind Vardarajan Santhanam
Jun Deng
Hewu GU
Jiming Guo
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Qualcomm Incorporated
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Priority to PCT/CN2020/070819 priority Critical patent/WO2021138826A1/fr
Publication of WO2021138826A1 publication Critical patent/WO2021138826A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information

Definitions

  • aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for cell selection according to support for a radio access technology (RAT) .
  • RAT radio access technology
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, and/or the like) .
  • multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, orthogonal frequency-division multiple access (OFDMA) systems, single-carrier frequency-division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE) .
  • LTE/LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP) .
  • UMTS Universal Mobile Telecommunications System
  • a wireless communication network may include a number of base stations (BSs) that can support communication for a number of user equipment (UEs) .
  • a user equipment (UE) may communicate with a base station (BS) via the downlink and uplink.
  • the downlink (or forward link) refers to the communication link from the BS to the UE
  • the uplink (or reverse link) refers to the communication link from the UE to the BS.
  • a BS may be referred to as a Node B, a gNB, an access point (AP) , a radio head, a transmit receive point (TRP) , a New Radio (NR) BS, a 5G Node B, and/or the like.
  • New Radio which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP) .
  • 3GPP Third Generation Partnership Project
  • NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL) , using CP-OFDM and/or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM) ) on the uplink (UL) , as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.
  • OFDM orthogonal frequency division multiplexing
  • SC-FDM e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)
  • DFT-s-OFDM discrete Fourier transform spread OFDM
  • MIMO multiple-input multiple-output
  • a method of wireless communication may include 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-radio access technology (RAT) dual connectivity or that have a neighboring cell that is determined to support a standalone mode of a RAT; and acquiring a cell on which to camp based at least in part on performing the scan.
  • RAT multi-radio access technology
  • a UE for wireless communication may include memory and one or more processors operatively coupled to the memory.
  • the memory and the one or more processors may be configured to 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, 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; and acquire a cell on which to camp based at least in part on performing the scan.
  • a non-transitory computer-readable medium may store one or more instructions for wireless communication.
  • the one or more instructions when executed by one or more processors of a UE, may cause the one or more processors to: 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, 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; and acquire a cell on which to camp based at least in part on performing the scan.
  • an apparatus for wireless communication 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; and means for acquiring a cell on which to camp based at least in part on performing the scan.
  • aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication device, and/or processing system as substantially described herein with reference to and as illustrated by the drawings and specification.
  • Fig. 1 is a block diagram conceptually illustrating an example of a wireless communication network, in accordance with various aspects of the present disclosure.
  • Fig. 2 is a block diagram conceptually illustrating an example of a base station in communication with a UE in a wireless communication network, in accordance with various aspects of the present disclosure.
  • Fig. 3 is a diagram illustrating an example of cell selection according to support for a radio access technology (RAT) , in accordance with various 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 various aspects of the present disclosure.
  • Fig. 1 is a diagram illustrating a wireless network 100 in which aspects of the present disclosure may be practiced.
  • the wireless network 100 may be an LTE network or some other wireless network, such as a 5G or NR network.
  • the wireless network 100 may include a number of BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities.
  • a BS is an entity that communicates with user equipment (UEs) and may also be referred to as a base station, a NR BS, a Node B, a gNB, a 5G node B (NB) , an access point, a transmit receive point (TRP) , and/or the like.
  • Each BS may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to a coverage area of a BS and/or a BS subsystem serving this coverage area, depending on the context in which the term is used.
  • a BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or another type of cell.
  • a macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription.
  • a pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription.
  • a femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs having association with the femto cell (e.g., UEs in a closed subscriber group (CSG) ) .
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a pico cell may be referred to as a pico BS.
  • a BS for a femto cell may be referred to as a femto BS or a home BS.
  • a BS 110a may be a macro BS for a macro cell 102a
  • a BS 110b may be a pico BS for a pico cell 102b
  • a BS 110c may be a femto BS for a femto cell 102c.
  • a BS may support one or multiple (e.g., three) cells.
  • eNB base station
  • NR BS NR BS
  • gNB gNode B
  • AP AP
  • node B node B
  • 5G NB 5G NB
  • cell may be used interchangeably herein.
  • a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile BS.
  • the BSs may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces such as a direct physical connection, a virtual network, and/or the like using any suitable transport network.
  • Wireless network 100 may also include relay stations.
  • a relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send a transmission of the data to a downstream station (e.g., a UE or a BS) .
  • a relay station may also be a UE that can relay transmissions for other UEs.
  • a relay station 110d may communicate with macro BS 110a and a UE 120d in order to facilitate communication between BS 110a and UE 120d.
  • a relay station may also be referred to as a relay BS, a relay base station, a relay, and/or the like.
  • Wireless network 100 may be a heterogeneous network that includes BSs of different types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/or the like. These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in wireless network 100.
  • macro BSs may have a high transmit power level (e.g., 5 to 40 Watts) whereas pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 Watts) .
  • a network controller 130 may couple to a set of BSs and may provide coordination and control for these BSs.
  • Network controller 130 may communicate with the BSs via a backhaul.
  • the BSs may also communicate with one another, e.g., directly or indirectly via a wireless or wireline backhaul.
  • UEs 120 may be dispersed throughout wireless network 100, and each UE may be stationary or mobile.
  • a UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, and/or the like.
  • a UE may be a cellular phone (e.g., a smart phone) , a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, biometric sensors/devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (e.g., smart ring, smart bracelet) ) , an entertainment device (e.g., a music or video device, or a satellite radio) , a vehicular component or sensor, smart meters/sensors, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium.
  • PDA personal digital assistant
  • WLL wireless local loop
  • MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, and/or the like, that may communicate with a base station, another device (e.g., remote device) , or some other entity.
  • a wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link.
  • Some UEs may be considered Internet-of-Things (IoT) devices, and/or may be implemented as NB-IoT (narrowband internet of things) devices.
  • Some UEs may be considered a Customer Premises Equipment (CPE) .
  • UE 120 may be included inside a housing that houses components of UE 120, such as processor components, memory components, and/or the like.
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support a particular radio access technology (RAT) and may operate on one or more frequencies.
  • a RAT may also be referred to as a radio technology, an air interface, and/or the like.
  • a frequency may also be referred to as a carrier, a frequency channel, and/or the like.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • NR or 5G RAT networks may be deployed.
  • two or more UEs 120 may communicate directly using one or more sidelink channels (e.g., without using a base station 110 as an intermediary to communicate with one another) .
  • the UEs 120 may communicate using peer-to-peer (P2P) communications, device-to-device (D2D) communications, a vehicle-to-everything (V2X) protocol (e.g., which may include a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, and/or the like) , a mesh network, and/or the like.
  • V2X vehicle-to-everything
  • the UE 120 may perform scheduling operations, resource selection operations, and/or other operations described elsewhere herein as being performed by the base station 110.
  • Fig. 1 is provided as an example. Other examples may differ from what is described with regard to Fig. 1.
  • Fig. 2 shows a block diagram of a design 200 of base station 110 and UE 120, which may be one of the base stations and one of the UEs in Fig. 1.
  • Base station 110 may be equipped with T antennas 234a through 234t
  • UE 120 may be equipped with R antennas 252a through 252r, where in general T ⁇ 1 and R ⁇ 1.
  • a transmit processor 220 may receive data from a data source 212 for one or more UEs, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQIs) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS (s) selected for the UE, and provide data symbols for all UEs. Transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI) and/or the like) and control information (e.g., CQI requests, grants, upper layer signaling, and/or the like) and provide overhead symbols and control symbols.
  • MCS modulation and coding schemes
  • Transmit processor 220 may also generate reference symbols for reference signals (e.g., the cell-specific reference signal (CRS) ) and synchronization signals (e.g., the primary synchronization signal (PSS) and secondary synchronization signal (SSS) ) .
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM and/or the like) to obtain an output sample stream.
  • TX transmit
  • MIMO multiple-input multiple-output
  • Each modulator 232 may process a respective output symbol stream (e.g., for OFDM and/or the like) to obtain an output sample stream.
  • Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.
  • the synchronization signals can be generated with location encoding to convey additional information.
  • antennas 252a through 252r may receive the downlink signals from base station 110 and/or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively.
  • Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a received signal to obtain input samples.
  • Each demodulator 254 may further process the input samples (e.g., for OFDM and/or the like) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller/processor 280.
  • a channel processor may determine reference signal received power (RSRP) , received signal strength indicator (RSSI) , reference signal received quality (RSRQ) , channel quality indicator (CQI) , and/or the like.
  • RSRP reference signal received power
  • RSSI received signal strength indicator
  • RSRQ reference signal received quality
  • CQI channel quality indicator
  • one or more components of UE 120 may be included in a housing.
  • a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports comprising RSRP, RSSI, RSRQ, CQI, and/or the like) from controller/processor 280. Transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, and/or the like) , and transmitted to base station 110.
  • modulators 254a through 254r e.g., for DFT-s-OFDM, CP-OFDM, and/or the like
  • the uplink signals from UE 120 and other UEs may be received by antennas 234, processed by demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by UE 120.
  • Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to controller/processor 240.
  • Base station 110 may include communication unit 244 and communicate to network controller 130 via communication unit 244.
  • Network controller 130 may include communication unit 294, controller/processor 290, and memory 292.
  • Controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform one or more techniques associated with cell selection according to support for a RAT, as described in more detail elsewhere herein.
  • controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform or direct operations of, for example, process 400 of Fig. 4, and/or other processes as described herein.
  • Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively.
  • memory 242 and/or memory 282 may comprise a non-transitory computer-readable medium storing one or more instructions for wireless communication.
  • the one or more instructions when executed by one or more processors of the base station 110 and/or the UE 120, may perform or direct operations of, for example, process 400 of Fig. 4, and/or other processes as described herein.
  • a scheduler 246 may schedule UEs for data transmission on the downlink and/or uplink.
  • 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.
  • process 400 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 4. Additionally, or alternatively, two or more of the blocks of process 400 may be performed in parallel.
  • ком ⁇ онент is intended to be broadly construed as hardware, firmware, and/or a combination of hardware and software.
  • a processor is implemented in hardware, firmware, and/or a combination of hardware and software.
  • satisfying a threshold may, depending on the context, refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, and/or the like.
  • “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c) .
  • the terms “has, ” “have, ” “having, ” and/or the like are intended to be open-ended terms. Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise.

Abstract

Divers aspects de la présente divulgation concernent de manière générale la communication sans fil. Selon certains aspects, un équipement utilisateur (UE) peut effectuer un balayage, associé à une procédure de sélection de cellule, qui donne la priorité à une première fréquence qui est identifiée dans une base de données de fréquences par rapport à une seconde fréquence qui n'est pas identifiée dans la base de données de fréquences. La base de données de fréquences peut identifier une ou plusieurs fréquences associées à des cellules qui sont déterminées pour prendre en charge une technologie d'accès radio multiple (RAT) double connectivité ou qui ont une cellule voisine qui est déterminée pour prendre en charge un mode autonome d'une RAT. L'UE peut acquérir une cellule sur laquelle se tenir sur la base, au moins en partie, de la réalisation du balayage. De nombreux autres aspects sont fournis.
PCT/CN2020/070819 2020-01-08 2020-01-08 Sélection de cellule en fonction d'un support pour une technologie d'accès radio WO2021138826A1 (fr)

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