WO2021223132A1 - Liste étendue de cellules voisines - Google Patents

Liste étendue de cellules voisines Download PDF

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Publication number
WO2021223132A1
WO2021223132A1 PCT/CN2020/088878 CN2020088878W WO2021223132A1 WO 2021223132 A1 WO2021223132 A1 WO 2021223132A1 CN 2020088878 W CN2020088878 W CN 2020088878W WO 2021223132 A1 WO2021223132 A1 WO 2021223132A1
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WIPO (PCT)
Prior art keywords
rat
system information
cell
communicating
network entity
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PCT/CN2020/088878
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English (en)
Inventor
Yuankun ZHU
Chaofeng HUI
Pan JIANG
Fojian ZHANG
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Qualcomm Incorporated
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Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2020/088878 priority Critical patent/WO2021223132A1/fr
Publication of WO2021223132A1 publication Critical patent/WO2021223132A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • 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 inter-radio access technology cell reselection.
  • 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 method generally includes communicating with a first cell via a first radio access technology (RAT) , receiving first system information from a second cell via a second RAT, and performing cell reselection from the first cell to a third cell using a third RAT based on the first system information.
  • RAT radio access technology
  • the method generally includes communicating with a user equipment (UE) via a first radio access technology (RAT) , transmitting, to the UE, first system information via a second RAT, and communicating with the UE via a third RAT based on the first system information.
  • UE user equipment
  • RAT radio access technology
  • aspects of the present disclosure provide means for, apparatus, processors, and computer-readable mediums for performing the methods described herein.
  • 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 wireless communication network, in accordance with certain aspects of the present disclosure.
  • FIG. 2 is a block diagram conceptually illustrating a design of an example a base station (BS) and user equipment (UE) , in accordance with certain aspects of the present disclosure.
  • BS base station
  • UE user equipment
  • FIG. 3 is an example frame format for certain wireless communication systems (e.g., new radio (NR) ) , in accordance with certain aspects of the present disclosure.
  • NR new radio
  • FIG. 4A illustrates an example wireless communication network with a standalone 5G wireless network, in accordance with certain aspects of the present disclosure.
  • FIG. 4B illustrates an example wireless communication network with a non-standalone 5G wireless network, in accordance with certain aspects of the present disclosure.
  • FIG. 5 is a signaling flow diagram illustrating example operations for cell reselection from a 2G/3G cell directly to a 5G cell, in accordance with certain aspects of the present disclosure.
  • FIG. 6 is a flow diagram illustrating example operations for wireless communication by a UE, in accordance with certain aspects of the present disclosure.
  • FIG. 7 is a flow diagram illustrating example operations for wireless communication by a BS, in accordance with certain aspects of the present disclosure.
  • FIG. 8 illustrates a communications device (e.g., a UE or BS) that may include various components configured to perform operations for the techniques disclosed herein in accordance with aspects of the present disclosure.
  • a communications device e.g., a UE or BS
  • FIG. 8 illustrates a communications device (e.g., a UE or BS) 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 provide cell reselection from a 2G/3G cell to a 5G cell.
  • the UE may reselect from a 2G/3G cell to a 5G cell using the system information from a 4G cell without having to reselect from the 2G/3G cell to the 4G cell.
  • the UE may acquire or derive a list of 4G neighbor cells based on system information received from the 2G/3G cell.
  • the UE may receive, from the 4G cell, system information that enables the UE to acquire and determine a 5G standalone neighbor cell list or 5G carrier frequencies.
  • the UE may perform cell reselection directly from the 2G/3G cell to the 5G cell without having to reselect from the 2G/3G cell to the 4G cell.
  • the cell reselection process described herein may provide a desirable time for a UE to transition from a 2G/3G cell to a 5G cell.
  • 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., e.g., 24 GHz to 53 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 BS 110a includes a RAT manager 112 that supports multiple RATs for cell reselection, in accordance with aspects of the present disclosure.
  • the UE 120a includes a cell reselection manager 122 that performs cell reselection from a 2G/3G cell to a 5G cell without performing cell reselection to a 4G cell, in accordance with aspects of the present disclosure.
  • 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.
  • 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.
  • a network controller 130 may be in communication with a set of BSs 110 and provide coordination and control for these BSs 110 (e.g., via a backhaul) .
  • the network controller 130 may be in communication with a core network 132 (e.g., a 5G Core Network (5GC) ) , which provides various network functions such as Access and Mobility Management, Session Management, User Plane Function, Policy Control Function, Authentication Server Function, Unified Data Management, Application Function, Network Exposure Function, Network Repository Function, Network Slice Selection Function, etc.
  • 5GC 5G Core Network
  • FIG. 2 illustrates example components of BS 110a and UE 120a (e.g., 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) , PBCH demodulation reference signal (DMRS) , and channel state information reference signal (CSI-RS) .
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • DMRS PBCH demodulation reference signal
  • CSI-RS channel state information reference signal
  • 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.
  • MIMO modulation reference signal
  • Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream. 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.
  • a respective output symbol stream e.g., for OFDM, etc.
  • 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 in the transceivers 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 240 of the BS 110a has a RAT manager 241 that supports multiple RATs for cell reselection, according to aspects described herein. As shown in FIG.
  • the controller/processor 280 of the UE 120a has a cell reselection manager 281 that performs cell reselection from a 2G/3G cell to a 5G cell without performing cell reselection to a 4G cell, according to aspects described herein. Although shown at the controller/processor, other components of the UE 120a and BS 110a may be used to perform the operations described herein.
  • NR may utilize orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) on the uplink and downlink.
  • OFDM orthogonal frequency division multiplexing
  • CP cyclic prefix
  • NR may support half-duplex operation using time division duplexing (TDD) .
  • OFDM and single-carrier frequency division multiplexing (SC-FDM) partition the system bandwidth into multiple orthogonal subcarriers, which are also commonly referred to as tones, bins, etc. Each subcarrier may be modulated with data. Modulation symbols may be sent in the frequency domain with OFDM and in the time domain with SC-FDM.
  • the spacing between adjacent subcarriers may be fixed, and the total number of subcarriers may be dependent on the system bandwidth.
  • the minimum resource allocation may be 12 consecutive subcarriers.
  • the system bandwidth may also be partitioned into subbands. For example, a subband may cover multiple RBs.
  • NR may support a base subcarrier spacing (SCS) of 15 KHz and other SCS may be defined with respect to the base SCS (e.g., 30 kHz, 60 kHz, 120 kHz, 240 kHz, etc. ) .
  • SCS base subcarrier spacing
  • FIG. 3 is a diagram showing an example of a frame format 300 for NR.
  • the transmission timeline for each of the downlink and uplink may be partitioned into units of radio frames.
  • Each radio frame may have a predetermined duration (e.g., 10 ms) and may be partitioned into 10 subframes, each of 1 ms, with indices of 0 through 9.
  • Each subframe may include a variable number of slots (e.g., 1, 2, 4, 8, 16, ...slots) depending on the SCS.
  • Each slot may include a variable number of symbol periods (e.g., 7, 12, or 14 symbols) depending on the SCS.
  • the symbol periods in each slot may be assigned indices.
  • a mini-slot which may be referred to as a sub-slot structure, refers to a transmit time interval having a duration less than a slot (e.g., 2, 3, or 4 symbols) .
  • Each symbol in a slot may indicate a link direction (e.g., DL, UL, or flexible) for data transmission and the link direction for each subframe may be dynamically switched.
  • the link directions may be based on the slot format.
  • Each slot may include DL/UL data as well as DL/UL control information.
  • a synchronization signal block is transmitted.
  • SSBs may be transmitted in a burst where each SSB in the burst corresponds to a different beam direction for UE-side beam management (e.g., including beam selection and/or beam refinement) .
  • the SSB includes a PSS, a SSS, and a two symbol PBCH.
  • the SSB can be transmitted in a fixed slot location, such as the symbols 0-3 as shown in FIG. 3.
  • the PSS and SSS may be used by UEs for cell search and acquisition.
  • the PSS may provide half-frame timing, the SS may provide the CP length and frame timing.
  • the PSS and SSS may provide the cell identity.
  • the PBCH carries some basic system information, such as downlink system bandwidth, timing information within radio frame, SS burst set periodicity, system frame number, etc.
  • the SSBs may be organized into SS bursts to support beam sweeping. Further system information such as, remaining minimum system information (RMSI) , system information blocks (SIBs) , other system information (OSI) can be transmitted on a physical downlink shared channel (PDSCH) in certain subframes.
  • the SSB can be transmitted up to sixty-four times, for example, with up to sixty-four different beam directions for mmWave.
  • the multiple transmissions of the SSB are referred to as a SS burst set.
  • SSBs in an SS burst set may be transmitted in the same frequency region, while SSBs in different SS bursts sets can be transmitted at different frequency regions.
  • FIG. 4A illustrates an example wireless communication network 400A with a standalone (SA) 5G wireless network, in accordance with certain aspects of the present disclosure.
  • the wireless network 400A may include an Evolved Packet Core (EPC) 432A, a 4G Radio Access Network (RAN) 414A, a 5G Core Network (5GC) 432B, a 5G RAN 414B, and a UE 120.
  • EPC Evolved Packet Core
  • RAN Radio Access Network
  • 5GC 5G Core Network
  • 5G RAN 414B may include one or more base stations (e.g., BS 110) and/or network controllers (e.g., network controller 130)
  • the 5G RAN 414B may also include one or more base stations and/or network controllers.
  • the EPC 432A may be in communication with the 4G RAN 414A via a user plane 416A and control plane 418A, and the 4G RAN 414A may be in communication with the UE 120 via the user plane 416A and control plane 418A through over-the-air resources (e.g., frequency-time resources) .
  • the 5GC 432B may be in communication with the 5G RAN 414B via a user plane 416B and control plane 418B, and the 5G RAN 414B may be in communication with the UE 120 via the user plane 416A and control plane 418A through over-the-air resources (e.g., frequency-time resources) .
  • the standalone 5G network provides a separate core network and 5G RAN as well as separate user plane and control plane traffic for various 5G wireless services (e.g., mmWave, eMBB, URLLC, or mMTC) .
  • FIG. 4B illustrates an example wireless communication network 400B with a non-standalone (NSA) 5G wireless network, in accordance with certain aspects of the present disclosure.
  • the wireless network 400B may include an EPC 432A, a 4G RAN 414A, a 5G RAN 414B, and a UE 120.
  • the 5G RAN 414B may be in communication with the EPC 432A and 4G RAN 414A through the user plane 416B.
  • the non-standalone 5G wireless network may lack a dedicated 5G core network, but instead rely on the EPC 432A to provide, for example, non-access stratum functions (e.g., mobility management and session management) and a gateway to a packet data network (e.g., the internet) .
  • the non-standalone 5G network may also lack a dedicate 5G control plane, such that the control plane for 5G services route through the 4G RAN 414A.
  • the non-standalone 5G network may focus on providing eMBB and mmWave services without support for other 5G services such as URLLC or mMTC.
  • a base station and/or RAN may support various RATs including 2G, 3G, 4G, and/or 5G.
  • the UE may first perform cell reselection to a 4G cell, and then the UE may perform cell reselection to the 5G cell.
  • the UE may obtain system information, from the 2G/3G cell, which enables the UE to perform cell reselection to the 4G cell.
  • the UE may measure various reference signals from the 4G cell based on the system information from the 2G/3G cell, and if the measurements satisfy various criteria for cell reselection, the UE may select the 4G cell for various services (e.g., data traffic, online gaming, etc. ) . Afterwards, the UE may obtain system information, from the 4G cell, which enables the UE to perform cell reselection to the 5G cell. Then, the UE may measure various reference signals from the 5G cell based on the system information received from the 4G cell, and if the measurement satisfy various criteria for cell reselection, the UE may select the 5G cell for various services (e.g., data traffic, online gaming, etc. ) . Such a process may provide an undesirable amount of time for a UE to transition from a 2G/3G cell to a 5G cell.
  • various services e.g., data traffic, online gaming, etc.
  • aspects of the present disclosure provide cell reselection from a 2G/3G cell to a 5G cell.
  • the UE may reselect from a 2G/3G cell to a 5G cell using the system information from the 4G cell without having to reselect from the 2G/3G cell to the 4G cell.
  • the UE may acquire or derive a list of 4G neighbor cells based on system information received from the 2G/3G cell.
  • the UE may receive, from the 4G cell, system information that enables the UE to acquire and determine a 5G SA neighbor cell list or 5G carrier frequencies.
  • the UE may perform cell reselection directly from the 2G/3G cell to the 5G cell without having to reselect from the 2G/3G cell to the 4G cell.
  • the cell reselection process described herein may provide a desirable time for a UE to transition from a 2G/3G cell to a 5G cell and acquire improved 5G services such as (e.g., mmWave, eMBB, URLLC, or mMTC) .
  • FIG. 5 illustrates a signaling flow diagram of example operations 500 for cell reselection from a 2G/3G cell to a 5G cell, in accordance with certain aspects of the present disclosure.
  • the UE 120 may be camped on a 2G/3G cell 110a.
  • the UE 120 may be monitoring for pages from the 2G/3G cell in a lower power state such as idle mode.
  • the UE 120 may be receiving data traffic from and/or transmitting data traffic to the 2G/3G cell in a connected mode.
  • the UE 120 may receive, from the 2G/3G cell 110a, system information that indicates a list of 4G neighbor cells.
  • the system information received at 504 may indicate carrier frequencies for 4G neighbor cells, and the UE 120 may derive the list of 4G neighbor cells by monitoring for signals at the 4G carrier frequencies.
  • the UE 120 may receive, from a 4G cell 110b, system information that indicates a list of 5G neighbor cells.
  • the system information received at 506 may provide carrier frequencies for inter-RAT cell re-selection to a 5G cell, and the UE 120 may derive the list of 5G neighbor cells by monitoring for signals at the 5G carrier frequencies.
  • the system information received at 506 may be a SIB Type 24 that provides information about 5G NR frequencies and 5G NR neighboring cells relevant for cell re-selection.
  • the UE 120 may monitor for signals from 5G neighbor cells based on the system information received at 506.
  • the UE 120 may receive reference signals (RSs) (e.g., synchronization signals (SSs) , channel state information (CSI) RSs, and/or demodulation RSs (DMRSs) ) and/or system information from the 5G cell 110c at the carrier frequencies indicated by the system information received at 506.
  • RSs reference signals
  • SSs synchronization signals
  • CSI channel state information
  • DMRSs demodulation RSs
  • the UE 120 may perform cell reselection from the 2G/3G cell 110a to the 5G cell 110c without performing cell reselection to the 4G cell 110b.
  • the 5G cell 110c may be a 5G cell in standalone mode.
  • the UE 120 may select the 5G cell 110c for cell reselection based on measurements of the RSs received at 506, such as measurements of Reference Signal Received Rower (RSRP) and/or Reference Signal Received Quality (RSRQ) satisfying various criteria (e.g., Q rxlevmin and/or Q qualmin ) , which may be configured in the system information received at 506.
  • the UE 120 may communicate with the 5G cell 110c. For example, after performing cell reselection, the UE 120 may receive data traffic via the 5G cell 110c using the 5G RAT. Without having to perform cell reselection to the 4G cell 110b, the UE 120 may acquire the 5G services (e.g., eMBB, URLLC, mMTC, or mmWave) in a desirable amount of time.
  • 5G services e.g., eMBB, URLLC, mMTC, or mmWave
  • a base station may support various RATs including 5G, 4G, 3G, and/or 2G, such that the cells 110a, 110b, and 110c are co-located at and/or integrated in the same base station.
  • FIG. 6 is a flow diagram illustrating example operations 600 for wireless communication, in accordance with certain aspects of the present disclosure.
  • the operations 600 may be performed, for example, by a UE (e.g., the UE 120a in the wireless communication network 100) as described herein with respect FIG. 5.
  • the operations 600 may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor 280 of FIG. 2) .
  • the transmission and reception of signals by the UE in operations 600 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 600 may begin, at 602, where the UE may communicate with a first cell (e.g., the 2G/3G cell 110a) via a first RAT.
  • the UE may receive first system information from a second cell (e.g., the 4G cell 110b) via a second RAT.
  • the UE may perform cell reselection from the first cell to a third cell (e.g., the 5G cell 110c) using a third RAT based on the first system information.
  • communicating with the first cell at 602 may include the UE transmitting data traffic to the first cell or receiving data traffic from the first cell using the first RAT.
  • communicating with the first cell at 602 may include the UE being camped on a 2G/3G cell in a low power state such as idle mode.
  • the UE may be camped on a 2G/3G cell as described herein with respect to FIG. 5.
  • communicating with the first cell at 602 may include the UE communicating with the first cell in a connected mode or idle mode.
  • the first system information may be a system information block (SIB) received via radio resource control (RRC) signaling.
  • SIB system information block
  • RRC radio resource control
  • the first system information may be a SIB type 24 message under the 3GPP standards for 4G RRC (e.g., the information element -SystemInformationBlockType24) .
  • the SIB type 24 message provides the inter-RAT cell reselection parameters for 5G NR, such as a carrier frequency list for 5G, various thresholds (e.g., Q rxlevmin and/or Q qualmin ) , timing occasions at which the UE measures reference signals (e.g., SSBs) for cell reselection, a cell reselection priority associated with a carrier frequency, etc.
  • the first system information indicates information for inter-RAT cell reselection with the third RAT.
  • the first system information may indicate a list of neighbor cells using the third RAT and/or one or more carrier frequencies for cell reselection using the third RAT.
  • receiving the first system information at 604 may include receiving the first system information via a SIB indicating one or more carrier frequencies for cell re-selection using the third RAT.
  • the UE may receive the first system information as described herein with respect to the system information received at 506 depicted in FIG. 5.
  • Cell reselection to a 5G cell may involve monitoring for signals using the 5G RAT and selecting a 5G cell based on measurements of the signals (e.g., RSRP and/or RSRQ) with respect to various thresholds (e.g., Q rxlevmin and/or Q qualmin ) , for example, as described herein with respect to the UE monitoring signals and selecting a 5G cell as depicted in FIG. 5. That is, performing cell reselection based on the first system information may include monitoring for signals using the third RAT at carrier frequencies indicated in the first system information.
  • the signals e.g., RSRP and/or RSRQ
  • various thresholds e.g., Q rxlevmin and/or Q qualmin
  • performing cell reselection at 606 may include monitoring for signals using the third RAT at carrier frequencies indicated in the first system information and selecting the third cell for communications based on measurements of the signals.
  • the UE may communicate with the third cell via the third RAT based on the selection.
  • the UE may perform cell reselection to a 5G cell at 606 without performing cell reselection to a 4G cell, which may provide a desirable amount of time to access 5G services from a 2G/3G cell. That is, performing cell reselection at 606 may include the UE performing cell reselection from a 2G/3G cell directly to a 5G cell.
  • the UE may receive, from a 2G/3G cell, system information that enables the UE to acquire the system information from a 4G cell, for example, as described herein with respect to the UE receiving the system information at 504 depicted in FIG. 5.
  • the system information may indicate a list of neighbor cells using a 4G RAT and/or one or more carrier frequencies for the 4G RAT.
  • the operations 600 may further include the UE receiving, from the first cell, a second system information indicating information (e.g., one or more carrier frequencies) for communicating with the second cell.
  • Receiving the first system information at 604 may include receiving the first system information based on the second system information. That is, the UE may monitor for signals carrying the first system information at the carrier frequencies indicated by the second system information.
  • the first RAT may refer to 2G and/or 3G RATs.
  • the first RAT may include at least one of Universal Mobile Telecommunications System (UMTS) , CDMA2000, or Global System for Wireless Communications (GSM) .
  • the second RAT may include a 4G RAT such as Evolved Terrestrial UMTS Radio Access (E-UTRA) , which may be referred to as LTE.
  • the third RAT may include a 5G RAT such as the Fifth Generation (5G) New Radio (NR) .
  • 5G Fifth Generation
  • NR Fifth Generation
  • the third cell may be a standalone 5G NR network entity, for example, as described herein with respect to FIG. 4A.
  • the first, second, and third cells may be part of a base station or RAN that supports multiple RATs such as 2G, 3G, 4G, and 5G RATs.
  • FIG. 7 is a flow diagram illustrating example operations 700 for wireless communication, in accordance with certain aspects of the present disclosure.
  • the operations 700 may be performed, for example, by a network entity (e.g., the BS 110a in the wireless communication network 100) as described herein with respect to FIG. 5.
  • the operations 700 may be complimentary to the operations 600 performed by the UE.
  • the operations 700 may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor 240 of FIG. 2) .
  • the transmission and reception of signals by the BS in operations 700 may be enabled, for example, by one or more antennas (e.g., antennas 234 of FIG. 2) .
  • a network entity may refer to a wireless communication device in a radio access network such as a base station and/or network controller.
  • the operations 700 may begin at 702, where the network entity communicates with a UE (e.g., the UE 120) via a first RAT.
  • the network entity may transmit, to the UE, first system information via a second RAT, and at 706, the network entity may communicate with the UE via a third RAT based on the first system information.
  • the network entity may be a base station or a RAN that supports multiple RATs such as 2G, 3G, 4G, and 5G RATs.
  • the network entity may include multiple base stations, where each base station supports one or more RATs. That is, the network entity may include multiple base stations in a RAN that supports multiple RATs.
  • the network entity may include a standalone 5G NR network entity such as a 5G base station or RAN, for example, as described herein with respect to FIG. 4A.
  • communicating with the UE at 702 may include the network entity transmitting data traffic to the UE or receiving data traffic from the UE using the first RAT.
  • communicating with the UE at 702 may include transmitting paging and/or control signaling to the UE as the UE is camped on a 2G/3G cell in a low power state such as idle mode.
  • the UE may be camped on a 2G/3G cell of the network entity as described herein with respect to FIG. 5.
  • communicating with the UE at 702 may include the network entity communicating with the UE, which may be in a connected mode or idle mode.
  • the first system information may be a SIB transmitted via RRC signaling.
  • the first system information may be a SIB type 24 message under the 3GPP standards for 4G RRC.
  • the first system information indicates information for inter-RAT cell reselection with the third RAT.
  • the first system information may indicate a list of neighbor cells using the third RAT and/or one or more carrier frequencies for cell reselection using the third RAT.
  • transmitting the first system information at 704 may include transmitting the first system information via a SIB indicating one or more carrier frequencies for cell re-selection using the third RAT.
  • the network entity may transmit the first system information as described herein with respect to the system information transmitted at 506 depicted in FIG. 5.
  • communicating with the UE at 706 may involve a cell reselection process, for example, as described herein with respect to the 5G cell transmitting signals as depicted in FIG. 5.
  • communicating with the UE at 706 may include the network entity transmitting, to the UE, signals (e.g., SS, CSI-RS, and/or DMRS) for cell reselection using the third RAT.
  • the network entity may transmit various system information used for cell selection and/or reselection.
  • communicating with the UE at 706 may include the network entity transmitting data traffic to the UE or receiving data traffic from the UE using the third RAT, for example, after the UE performs cell reselection.
  • the network entity may transmit, to the UE, system information that enables the UE to acquire the system information from a 4G cell, for example, as described herein with respect to the 4G cell transmitting the system information at 504 depicted in FIG. 5.
  • the system information may indicate a list of neighbor cells using a 4G RAT and/or one or more carrier frequencies for the 4G RAT.
  • the operations 700 may further include the network entity transmitting, to the UE, a second system information indicating information (e.g., one or more carrier frequencies and/or a list of 4G neighbor cells) for communicating with the second cell.
  • Transmitting the first system information at 704 may include transmitting the first system information based on the second system information. That is, the network entity may transmit signals (e.g., RRC signaling) carrying the first system information at the carrier frequencies indicated by the second system information.
  • the first RAT may refer to 2G and/or 3G RATs.
  • the first RAT may include at least one UMTS, CDMA2000, or GSM.
  • the second RAT may include a 4G RAT such as E-UTRA, and the third RAT may include a 5G RAT such as 5G NR.
  • FIG. 8 illustrates a wireless communications device 800 (e.g., the UE 120 and/or BS 110) 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 FIGs. 6 and/or 7.
  • the communications device 800 includes a processing system 802 coupled to a transceiver 808 (e.g., a transmitter and/or a receiver) .
  • the transceiver 808 is configured to transmit and receive signals for the communications device 800 via an antenna 810, such as the various signals as described herein.
  • the processing system 802 may be configured to perform processing functions for the communications device 800, including processing signals received and/or to be transmitted by the communications device 800.
  • the processing system 802 includes a processor 804 coupled to a computer-readable medium/memory 812 via a bus 806.
  • the computer-readable medium/memory 812 is configured to store instructions (e.g., computer-executable code) that when executed by the processor 804, cause the processor 804 to perform the operations illustrated in FIGs. 6 and/or 7, or other operations for performing the various techniques discussed herein for cell reselection from a 2G/3G cell to a 5G cell.
  • computer-readable medium/memory 812 stores code for receiving 814, code for transmitting 816, code for communicating 818 (which may include code for receiving 814 and/or code for transmitting 816) , and/or code for performing 820 (which may include code for monitoring (not shown) , code for selecting (not shown) , and/or code for communicating 818) .
  • the processor 804 has circuitry configured to implement the code stored in the computer-readable medium/memory 812.
  • the processor 804 includes circuitry for receiving 824, circuitry for transmitting 826, circuitry for communicating 828 (which may include circuitry for receiving 824 and/or circuitry for transmitting 826) , and/or circuitry for performing 830 (which may include circuitry for monitoring (not shown) , circuitry for selecting (not shown) , and/or circuitry for communicating 828) .
  • 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. 6 and/or FIG. 7.
  • 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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Abstract

La présente invention porte, selon des aspects, sur des techniques pour une resélection de cellule. Un procédé qui peut être réalisé par un équipement utilisateur (UE) consiste à communiquer avec une première cellule par le biais d'une première technologie d'accès radio (RAT), à recevoir des premières informations de système en provenance d'une seconde cellule par le biais d'une deuxième RAT et à réaliser une resélection de cellule de la première cellule à une troisième cellule à l'aide d'une troisième RAT sur la base des premières informations de système.
PCT/CN2020/088878 2020-05-07 2020-05-07 Liste étendue de cellules voisines WO2021223132A1 (fr)

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Citations (3)

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US20150289189A1 (en) * 2014-04-02 2015-10-08 Qualcomm Incorporated Cell reselection
CN108632923A (zh) * 2017-03-24 2018-10-09 中国移动通信有限公司研究院 空闲态互操作方法、装置、终端及网络侧设备
CN109729564A (zh) * 2017-10-27 2019-05-07 华为技术有限公司 一种接入方法以及相关设备

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US20150289189A1 (en) * 2014-04-02 2015-10-08 Qualcomm Incorporated Cell reselection
CN108632923A (zh) * 2017-03-24 2018-10-09 中国移动通信有限公司研究院 空闲态互操作方法、装置、终端及网络侧设备
CN109729564A (zh) * 2017-10-27 2019-05-07 华为技术有限公司 一种接入方法以及相关设备

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