WO2021253320A1 - Atténuation de configuration d'agrégation de porteuses incorrecte - Google Patents

Atténuation de configuration d'agrégation de porteuses incorrecte Download PDF

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Publication number
WO2021253320A1
WO2021253320A1 PCT/CN2020/096789 CN2020096789W WO2021253320A1 WO 2021253320 A1 WO2021253320 A1 WO 2021253320A1 CN 2020096789 W CN2020096789 W CN 2020096789W WO 2021253320 A1 WO2021253320 A1 WO 2021253320A1
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WO
WIPO (PCT)
Prior art keywords
cell
rlfs
configuration
message
combination
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PCT/CN2020/096789
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English (en)
Inventor
Tianya LIN
Jian Li
Fojian ZHANG
Chaofeng HUI
Changyun Wang
Xiansong SHEN
Pan JIANG
Hao Zhang
Xiuqiu XIA
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Qualcomm Incorporated
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Priority to PCT/CN2020/096789 priority Critical patent/WO2021253320A1/fr
Publication of WO2021253320A1 publication Critical patent/WO2021253320A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H04W76/16—Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/34—Selective release of ongoing connections

Definitions

  • aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for mitigating an incorrect carrier aggregation (CA) configuration in wireless communications systems supporting dual connectivity with new radio (DCNR) communications with user equipments (UEs) .
  • CA carrier aggregation
  • DCNR new radio
  • 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 receiving a configuration that indicates a threshold number of radio link failures (RLFs) , determining a first number of RLFs due to a carrier aggregation (CA) combination, wherein the first number is equal to or greater than the threshold number of RLFs, and transmitting a first message to a first cell, in response to the determination.
  • RLFs radio link failures
  • CA carrier aggregation
  • the apparatus generally includes an interface configured to obtain a configuration that indicates a threshold number of radio link failures (RLFs) and a processing system configured to determine a first number of RLFs due to a carrier aggregation (CA) combination, wherein the first number is equal to or greater than the threshold number of RLFs, wherein the interface is further configured to output a first message for transmission to a first cell, in response to the determination.
  • RLFs radio link failures
  • CA carrier aggregation
  • the apparatus generally includes means for obtaining a configuration that indicates a threshold number of radio link failures (RLFs) , means for determining a first number of RLFs due to a carrier aggregation (CA) combination, wherein the first number is equal to or greater than the threshold number of RLFs, and means for outputting a first message for transmission to a first cell, in response to the determination.
  • RLFs radio link failures
  • CA carrier aggregation
  • the UE generally includes a receiver configured to receive a configuration that indicates a threshold number of radio link failures (RLFs) , a processing system configured to determine a first number of RLFs due to a carrier aggregation (CA) combination, wherein the first number is equal to or greater than the threshold number of RLFs, and a transmitter configure to transmit a first message to a first cell, in response to the determination.
  • RLFs radio link failures
  • CA carrier aggregation
  • the computer-readable medium generally includes instructions executable to receive a configuration that indicates a threshold number of radio link failures (RLFs) , determine a first number of RLFs due to a carrier aggregation (CA) combination, wherein the first number is equal to or greater than the threshold number of RLFs, and transmit a first message to a first cell, in response to the determination.
  • RLFs radio link failures
  • CA carrier aggregation
  • 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. 4 is a call flow diagram 400 illustrating example signaling by a UE 120 experiencing an issue of an unsupported carrier aggregation (CA) combination in a wireless communications system supporting dual connectivity with new radio (DCNR) communications.
  • CA carrier aggregation
  • FIG. 5 is a flow diagram illustrating example operations for wireless communication by a UE, in accordance with certain aspects of the present disclosure.
  • FIG. 6 is a call flow diagram illustrating example signaling for mitigating an incorrect CA configuration in wireless communications systems supporting DCNR communications, in accordance with aspects of the present disclosure.
  • FIG. 7 illustrates a communications device that may include various components configured to perform the operations illustrated in FIG. 5, in accordance with aspects of the present disclosure.
  • the attached APPENDIX includes details of certain aspects of the present disclosure.
  • aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums for mitigating an incorrect carrier aggregation (CA) configuration in wireless communications systems supporting dual connectivity with new radio (DCNR) communications with user equipments (UEs) .
  • DCNR new radio
  • UEs user equipments
  • some wireless communications systems supporting DCNR communications with UEs some customers report that their UEs repeatedly suffer from radio link failure (RLF) and are unable to use new radio 5 th generation (NR5G) services.
  • RLF radio link failure
  • N5G new radio 5 th generation
  • the UEs could not provide any data service, which results in a poor user experience. It was found in these networks that the networks were configuring the UEs with an invalid frequency band combination for carrier aggregation (CA) .
  • Each of the UEs would evaluate the CA combination, determine that the UE could not support the CA combination, and declare an RLF. The UE would then repeatedly reconnect to the network and receive the same configuration with the same CA combination and declare another RLF. The UE would never have a network connection on which the UE could perform packet switched (PS) data transmissions. In some cases the CA combination is invalid for all UEs; in other cases the CA combination is unsupported by the UE.
  • PS packet switched
  • CA carrier aggregation
  • DCNR new radio
  • 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 wireless communication network 100 may be in communication with a core network 132.
  • the core network 132 may in communication with one or more base station (BSs) 110 and/or user equipment (UE) 120 in the wireless communication network 100 via one or more interfaces.
  • BSs base station
  • UE user equipment
  • the UEs 120 may be configured for mitigating an incorrect carrier aggregation (CA) configuration in wireless communications systems supporting dual connectivity with new radio (DCNR) communications with user equipments (UEs) .
  • the UE 120a includes a DCNR manager 122 that receives a configuration that indicates a threshold number of radio link failures (RLFs) ; determines a first number of RLFs due to a carrier aggregation (CA) combination, wherein the first number is equal to or greater than the threshold number of RLFs; and transmits a first message to a first cell, in response to the determination, in accordance with aspects of the present disclosure.
  • RLFs radio link failures
  • CA carrier aggregation
  • 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 254a-254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 120a to a data sink 260, and provide decoded control information to a controller/processor 280.
  • a transmit processor 264 may receive and process data (e.g., for the physical uplink shared channel (PUSCH) ) from a data source 262 and control information (e.g., for the physical uplink control channel (PUCCH) from the controller/processor 280.
  • the transmit processor 264 may also generate reference symbols for a reference signal (e.g., for the sounding reference signal (SRS) ) .
  • the symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the modulators in transceivers 254a-254r (e.g., for SC-FDM, etc. ) , and transmitted to the BS 110a.
  • the uplink signals from the UE 120a may be received by the antennas 234, processed by the modulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 120a.
  • the receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller/processor 240.
  • the memories 242 and 282 may store data and program codes for BS 110a and UE 120a, respectively.
  • a scheduler 244 may schedule UEs for data transmission on the downlink and/or uplink.
  • Antennas 252, processors 266, 258, 264, and/or controller/processor 280 of the UE 120a and/or antennas 234, processors 220, 230, 238, and/or controller/processor 240 of the BS 110a may be used to perform the various techniques and methods described herein. For example, as shown in FIG.
  • the controller/processor 280 of the UE 120a has a DCNR manager 281 that receives a configuration that indicates a threshold number of radio link failures (RLFs) ; determines a first number of RLFs due to a carrier aggregation (CA) combination, wherein the first number is equal to or greater than the threshold number of RLFs; and transmits a first message to a first cell, in response to the determination, according to aspects described herein.
  • RLFs radio link failures
  • CA carrier aggregation
  • 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. 4 is a call flow diagram 400 illustrating example signaling by a UE 120 experiencing an issue of an unsupported CA combination in a wireless communications system supporting DCNR communications with UEs, in accordance with aspects of the present disclosure.
  • an LTE cell 410 sends an RRCConnectionReconfiguration message, with an CA combination that is unsupported by the UE, to cause the UE to connect with NSA NR cell 420.
  • the UE validates the RRC configuration, determines that the RRC configuration includes the CA combination that the UE does not support, and declares an RLF.
  • the UE may loop through Procedure #1 452 at 450.
  • aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums for mitigating an incorrect carrier aggregation (CA) configuration in wireless communications systems supporting dual connectivity with new radio (DCNR) communications with user equipments (UEs) .
  • CA carrier aggregation
  • DCNR new radio
  • a UE may use a detection mechanism to detect that RLFs are occurring due to a CA combination that the UE does not support.
  • the detection may include at least three features:
  • T_duration which is a time span during which the UE calculate (e.g., counts) a number of times of receiving an incorrect UE CA combination from the network;
  • N_times which is a counter of the number of receiving an incorrect UE CA combination from the network.
  • Max_RLF which is a configurable (e.g., received in a configuration from the network) maximum number of times the UE may declare RLF due to receiving an incorrect UE CA combination from the network during the T_duration.
  • a UE receives an unsupported CA combination a number of times (N_times) that equals or exceeds Max_RLF, then the UE disables E-UTRAN NR dual connectivity (ENDC, i.e., DCNR) and falls back to LTE-only mode. The UE may then perform PS data transmissions with an LTE cell.
  • N_times a number of times
  • DCNR E-UTRAN NR dual connectivity
  • a UE if a UE repeatedly receives an RRCConnectionReconfiguration message with a CA combination that is unsupported by the UE from the network, then the network may be in an abnormal status. In these aspects, it is desirable for the UE to disable ENDC and fallback to LTE-only mode.
  • the following benefits may be realized by the UE disabling ENDC and falling back to LTE-only mode:
  • the UE may recover from the RLF status
  • the UE may provide data service and avoid a data stall issue.
  • FIG. 5 is a flow diagram illustrating example operations 500 for wireless communication, in accordance with certain aspects of the present disclosure.
  • the operations 500 may be performed, for example, by UE (e.g., the UE 120 in the wireless communication network 100 and shown in FIG. 6, below) .
  • the operations 500 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 500 may be enabled, for example, by one or more antennas (e.g., antennas 252 of FIG. 2) .
  • the transmission and/or reception of signals by the UE may be implemented via a bus interface of one or more processors (e.g., controller/processor 280) obtaining and/or outputting signals.
  • the operations 500 may begin, at block 502, by receiving a configuration that indicates a threshold number of radio link failures (RLFs) .
  • RLFs radio link failures
  • Operations 500 may continue, at block 504, by determining a first number of RLFs due to a carrier aggregation (CA) combination, wherein the first number is equal to or greater than the threshold number of RLFs.
  • CA carrier aggregation
  • operations 500 may continue by transmitting a first message to a first cell (e.g., the cell 610 in FIG. 6, below) , in response to the determination.
  • a first cell e.g., the cell 610 in FIG. 6, below
  • a UE performing operations 500 may receive, from the first cell, a second message including the configuration, wherein the configuration includes the CA combination.
  • the second message includes a radio resource control (RRC) connection reconfiguration (RRCConnectionReconfiguration) message.
  • RRC radio resource control
  • RRCConnectionReconfiguration radio resource control
  • the configuration may include a time span; and the first number of RLFs may be determined during the time span.
  • the configuration of block 502 may be obtained from a memory of the UE; and a UE performing operations 500 may receive the CA combination from the first cell.
  • the configuration may include a time span; and the first number of RLFs may be determined during the time span.
  • the determination in block 504 of each of the first number of RLFs may include performing a radio resource control (RRC) validation procedure based on the CA combination; and each of the RLFs may include a failure associated with the performance.
  • RRC radio resource control
  • the first message of block 506 may include an indication that the UE performing operations 500 does not support dual connectivity with new radio (DCNR) .
  • the first message of block 506 may include an attach request for wireless communications only between the UE and the first cell; and the UE performing operations 500 may transmit a detach request to the first cell prior to transmitting the attach request to the first cell.
  • the first message of block 506 may include a tracking area update (TAU) request.
  • the indication may include an information element having a value being set to indicate that the UE does not support dual connectivity with new radio (DCNR) .
  • the DCNR may include potential wireless communications between the UE and a second cell (e.g., cell 620 in FIG. 6, described below) via the first cell of block 506.
  • the first cell of block 506 may be associated with a long term evolution (LTE) radio access technology (RAT)
  • the second cell may be associated with a new radio (NR) RAT.
  • LTE long term evolution
  • NR new radio
  • the first message of block 506 may include an attach request for wireless communications only between the UE and the first cell; and the UE performing operations 500 may transmit a detach request to the first cell prior to transmitting the attach request to the first cell.
  • the first message may include a tracking area update (TAU) request.
  • TAU tracking area update
  • the first cell of block 506 may be associated with a long term evolution (LTE) RAT.
  • LTE long term evolution
  • FIG. 6 is an exemplary call flow diagram 600 illustrating example signaling by a UE 120 mitigating an incorrect carrier aggregation (CA) configuration in wireless communications systems supporting DCNR communications, in accordance with certain aspects of the present disclosure.
  • an LTE cell 610 sends an RRCConnectionReconfiguration message with an unsupported (e.g., unsupported by the UE) CA configuration to the UE.
  • the UE validates the RRC configuration, determines that the RRC configuration includes the CA combination that the UE does not support, and declares an RLF.
  • the UE determines if the UE has performed a number of failed RRC validations equal to or exceeding a maximum number of RLFs (MAX_RLF) .
  • MAX_RLF maximum number of RLFs
  • the UE may loop through Procedure #1 652. If the number of failed RRC validations is greater than or equal to MAX_RLF, then the UE sends an ATTACH_REQ with an indication that the UE does not support DCNR at 664. At 666, the LTE cell sends an ATTACH_ACCEPT to the UE. At 670, the UE communicates in LTE mode with the LTE cell.
  • FIG. 7 illustrates a communications device 700 that may include various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein, such as the operations illustrated in FIG. 5.
  • the communications device 700 includes a processing system 702 coupled to a transceiver 708 (e.g., a transmitter and/or a receiver) .
  • the transceiver 708 is configured to transmit and receive signals for the communications device 700 via an antenna 710, such as the various signals as described herein.
  • the processing system 702 may be configured to perform processing functions for the communications device 700, including processing signals received and/or to be transmitted by the communications device 700.
  • the processing system 702 includes a processor 704 coupled to a computer-readable medium/memory 712 via a bus 706.
  • the computer-readable medium/memory 712 is configured to store instructions (e.g., computer-executable code) that when executed by the processor 704, cause the processor 704 to perform the operations illustrated in FIG. 5, or other operations for performing the various techniques discussed herein for mitigating an incorrect carrier aggregation (CA) configuration in wireless communications systems supporting dual connectivity with new radio (DCNR) communications.
  • instructions e.g., computer-executable code
  • computer-readable medium/memory 712 stores code 714 for receiving a configuration that indicates a threshold number of radio link failures (RLFs) ; code 716 for determining a first number of RLFs due to a carrier aggregation (CA) combination, wherein the first number is equal to or greater than the threshold number of RLFs; and code 718 for transmitting a first message to a first cell, in response to the determination.
  • the processor 704 has circuitry configured to implement the code stored in the computer-readable medium/memory 712.
  • the processor 704 includes circuitry 724 for receiving a configuration that indicates a threshold number of radio link failures (RLFs) ; circuitry 726 for determining a first number of RLFs due to a carrier aggregation (CA) combination, wherein the first number is equal to or greater than the threshold number of RLFs; and circuitry 728 transmitting a first message to a first cell, in response to the determination.
  • RLFs radio link failures
  • CA carrier aggregation
  • 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
  • processors 258, 264 and 266, and/or controller/processor 280 of the UE 120a and/or processors 220, 230, 238, and/or controller/processor 240 of the BS 110a shown in FIG. 2 may be configured to perform operations 500 of FIG. 5.
  • Means for receiving may include a transceiver, a receiver or at least one antenna and at least one receive processor illustrated in FIG. 2.
  • Means for transmitting, means for sending or means for outputting may include, a transceiver, a transmitter or at least one antenna and at least one transmit processor illustrated in FIG. 2.
  • Means for determining and means for performing may include a processing system, which may include one or more processors, such as processors 258, 264 and 266, and/or controller/processor 280 of the UE 120a and/or processors 220, 230, 238, and/or controller/processor 240 of the BS 110a shown in FIG. 2.
  • a device may have an interface to output a frame for transmission (a means for outputting) .
  • a processor may output a frame, via a bus interface, to a radio frequency (RF) front end for transmission.
  • RF radio frequency
  • a device may have an interface to obtain a frame received from another device (a means for obtaining) .
  • a processor may obtain (or receive) a frame, via a bus interface, from an RF front end for reception.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • PLD programmable logic device
  • a general- purpose processor may be a microprocessor, but in the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • an example hardware configuration may comprise a processing system in a wireless node.
  • the processing system may be implemented with a bus architecture.
  • the bus may include any number of interconnecting buses and bridges depending on the specific application of the processing system and the overall design constraints.
  • the bus may link together various circuits including a processor, machine-readable media, and a bus interface.
  • the bus interface may be used to connect a network adapter, among other things, to the processing system via the bus.
  • the network adapter may be used to implement the signal processing functions of the PHY layer.
  • a user interface e.g., keypad, display, mouse, joystick, etc.
  • a user interface e.g., keypad, display, mouse, joystick, etc.
  • the bus may also link various other circuits such as timing sources, peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further.
  • the processor may be implemented with one or more general-purpose and/or special-purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuitry that can execute software. Those skilled in the art will recognize how best to implement the described functionality for the processing system depending on the particular application and the overall design constraints imposed on the overall system.
  • the functions may be stored or transmitted over as one or more instructions or code on a computer readable medium.
  • Software shall be construed broadly to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • Computer-readable media include both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • the processor may be responsible for managing the bus and general processing, including the execution of software modules stored on the machine-readable storage media.
  • a computer-readable storage medium may be coupled to a processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor.
  • the machine-readable media may include a transmission line, a carrier wave modulated by data, and/or a computer readable storage medium with instructions stored thereon separate from the wireless node, all of which may be accessed by the processor through the bus interface.
  • the machine-readable media, or any portion thereof may be integrated into the processor, such as the case may be with cache and/or general register files.
  • machine-readable storage media may include, by way of example, RAM (Random Access Memory) , flash memory, ROM (Read Only Memory) , PROM (Programmable Read-Only Memory) , EPROM (Erasable Programmable Read-Only Memory) , EEPROM (Electrically Erasable Programmable Read-Only Memory) , registers, magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof.
  • RAM Random Access Memory
  • ROM Read Only Memory
  • PROM Programmable Read-Only Memory
  • EPROM Erasable Programmable Read-Only Memory
  • EEPROM Electrical Erasable Programmable Read-Only Memory
  • registers magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof.
  • the machine-readable media may be embodied in a computer-program product.
  • a software module may comprise a single instruction, or many instructions, and may be distributed over several different code segments, among different programs, and across multiple storage media.
  • the computer-readable media may comprise a number of software modules.
  • the software modules include instructions that, when executed by an apparatus such as a processor, cause the processing system to perform various functions.
  • the software modules may include a transmission module and a receiving module. Each software module may reside in a single storage device or be distributed across multiple storage devices.
  • a software module may be loaded into RAM from a hard drive when a triggering event occurs.
  • the processor may load some of the instructions into cache to increase access speed.
  • One or more cache lines may then be loaded into a general register file for execution by the processor.
  • any connection is properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared (IR) , radio, and microwave
  • the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
  • Disk and disc include compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , floppy disk, and disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers.
  • computer-readable media may comprise non-transitory computer-readable media (e.g., tangible media) .
  • computer-readable media may comprise transitory computer-readable media (e.g., a signal) . Combinations of the above should also be included within the scope of computer-readable media.
  • certain aspects may comprise a computer program product for performing the operations presented herein.
  • a computer program product may comprise a computer-readable medium having instructions stored (and/or encoded) thereon, the instructions being executable by one or more processors to perform the operations described herein, for example, instructions for performing the operations described herein and illustrated in FIG. 5.
  • 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.
  • STAT_UPDATE_IND. status to FAILURE -LTE shall trigger 4GRLF
  • T_duration A time span to calculate times of incorrect UE CA Combo from network
  • N_times Incorrect CA Combo times that UE received
  • UE During T_duration, if UE receive un-support CA Combo times exceed Max_RLF, UE disable ENDC and fallback to LTE only mode.
  • UE could provide data service and avoid data stall issue.
  • step1 &step2 If UE disable ENDC and work in LTE mode, it may use this invention.

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

Abstract

Selon certains aspects, la présente invention concerne des techniques pour atténuer une configuration d'agrégation de porteuses incorrecte. Un procédé qui peut être exécuté par un équipement utilisateur (UE) comprend la réception d'une configuration qui indique un nombre seuil de défaillances de liaison radio (RLF) ; la détermination d'un premier nombre de RLF dues à une combinaison d'agrégation de porteuses (CA), le premier nombre étant égal ou supérieur au nombre seuil de RLF ; et la transmission d'un premier message à une première cellule, en réponse à la détermination.
PCT/CN2020/096789 2020-06-18 2020-06-18 Atténuation de configuration d'agrégation de porteuses incorrecte WO2021253320A1 (fr)

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