WO2021232335A1 - Techniques d'amélioration des transferts dans des réseaux sans fil - Google Patents

Techniques d'amélioration des transferts dans des réseaux sans fil Download PDF

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Publication number
WO2021232335A1
WO2021232335A1 PCT/CN2020/091512 CN2020091512W WO2021232335A1 WO 2021232335 A1 WO2021232335 A1 WO 2021232335A1 CN 2020091512 W CN2020091512 W CN 2020091512W WO 2021232335 A1 WO2021232335 A1 WO 2021232335A1
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WIPO (PCT)
Prior art keywords
measurement report
parameter
triggering
timer value
processor
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PCT/CN2020/091512
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English (en)
Inventor
Zhuoqi XU
Yuankun ZHU
Pan JIANG
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Qualcomm Incorporated
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Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2020/091512 priority Critical patent/WO2021232335A1/fr
Publication of WO2021232335A1 publication Critical patent/WO2021232335A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H04W36/0088—Scheduling hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H04W36/324—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data by mobility data, e.g. speed data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837—Determination of triggering parameters for hand-off

Definitions

  • aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for improving handovers in wireless networks.
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, etc. These wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc. ) .
  • available system resources e.g., bandwidth, transmit power, etc.
  • multiple-access systems examples include 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) systems, LTE Advanced (LTE-A) systems, code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems, to name a few.
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • LTE-A LTE Advanced
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • New radio e.g., 5G NR
  • 5G NR is an example of an emerging telecommunication standard.
  • NR is a set of enhancements to the LTE mobile standard promulgated by 3GPP.
  • NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using OFDMA with a cyclic prefix (CP) on the downlink (DL) and on the uplink (UL) .
  • CP cyclic prefix
  • NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.
  • MIMO multiple-input multiple-output
  • the apparatus generally includes at least one processor configured to: determine a velocity associated with a user equipment (UE) ; determine, based on the determined velocity of the UE, a parameter for triggering a measurement report transmission associated with a mobility event; and transmit configuration information to the UE, including the parameter for triggering the measurement report.
  • the apparatus also generally includes a memory coupled with the at least one processor.
  • the method generally includes determining a velocity associated with a user equipment (UE) ; determining, based on the determined velocity of the UE, a parameter for triggering a measurement report transmission associated with a mobility event; and transmitting configuration information to the UE, including the parameter for triggering the measurement report.
  • UE user equipment
  • the apparatus generally includes means for determining a velocity associated with a user equipment (UE) ; means for determining, based on the determined velocity of the UE, a parameter for triggering a measurement report transmission associated with a mobility event; and means for transmitting configuration information to the UE, including the parameter for triggering the measurement report.
  • UE user equipment
  • Non-transitory computer-readable medium for wireless communication by a base station (BS) .
  • the non-transitory computer readable medium generally includes instructions that, when executed by at least one processor, cause the at least one processor to: determine a velocity associated with a user equipment (UE) ; determine, based on the determined velocity of the UE, a parameter for triggering a measurement report transmission associated with a mobility event; and transmit configuration information to the UE, including the parameter for triggering the measurement report.
  • UE user equipment
  • the apparatus generally includes at least one processor configured to: transmit one or more reference signals (RSs) to a base station (BS) indicating a velocity associated with the UE; and receive configuration information from the BS, including a parameter for triggering a measurement report transmission associated with a mobility event, wherein the parameter is based on the one or more RSs and the velocity associated with the UE.
  • the apparatus also generally includes a memory coupled with the at least one processor.
  • the method generally includes transmitting one or more reference signals (RSs) to a base station (BS) indicating a velocity associated with the UE; and receiving configuration information from the BS, including a parameter for triggering a measurement report transmission associated with a mobility event, wherein the parameter is based on the one or more RSs and the velocity associated with the UE.
  • RSs reference signals
  • BS base station
  • the apparatus generally includes means for transmitting one or more reference signals (RSs) to a base station (BS) indicating a velocity associated with the UE; and means for receiving configuration information from the BS, including a parameter for triggering a measurement report transmission associated with a mobility event, wherein the parameter is based on the one or more RSs and the velocity associated with the UE.
  • RSs reference signals
  • BS base station
  • configuration information including a parameter for triggering a measurement report transmission associated with a mobility event, wherein the parameter is based on the one or more RSs and the velocity associated with the UE.
  • Non-transitory computer-readable medium for wireless communication by a user equipment (UE) .
  • the non-transitory computer readable medium generally includes instructions that, when executed by at least one processor, cause the at least one processor to: transmit one or more reference signals (RSs) to a base station (BS) indicating a velocity associated with the UE; and receive configuration information from the BS, including a parameter for triggering a measurement report transmission associated with a mobility event, wherein the parameter is based on the one or more RSs and the velocity associated with the UE.
  • RSs reference signals
  • BS base station
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the appended drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed.
  • FIG. 1 is a block diagram conceptually illustrating an example telecommunications system, in accordance with certain aspects of the present disclosure.
  • FIG. 2 is a block diagram conceptually illustrating a design of an example a base station (BS) and user equipment (UE) , in accordance with certain aspects of the present disclosure.
  • BS base station
  • UE user equipment
  • FIG. 3 is an example frame format for new radio (NR) , in accordance with certain aspects of the present disclosure.
  • FIG. 4 is a flow diagram illustrating example operations for wireless communication by a base station (BS) , in accordance with certain aspects of the present disclosure.
  • BS base station
  • FIG. 5 is a flow diagram illustrating example operations for wireless communication by a user equipment (UE) , in accordance with certain aspects of the present disclosure.
  • UE user equipment
  • FIG. 6 is a decision flow diagram illustrating example operations for determining a parameter for triggering a measurement report transmission associated with a mobility event, in accordance with certain aspects herein, in accordance with certain aspects of the present disclosure.
  • FIG. 7 illustrates a communications device that may include various components configured to perform operations for the techniques disclosed herein in accordance with aspects of the present disclosure.
  • FIG. 8 illustrates a communications device that may include various components configured to perform operations for the techniques disclosed herein in accordance with aspects of the present disclosure
  • a user equipment may be provided with configuration information for detecting mobility events and transmitting measurement reports associated with those mobility events.
  • the measurement reports may be transmitted by the UE to a serving cell to indicate the need for the UE to be handed over to a non-serving cell.
  • One such instance may occur when a signal strength associated with the non-serving base station exceeds the signal strength associated with the serving base station by an offset, such as an A3 event.
  • the configuration information may include one or more parameters, such as a time to trigger parameter, which may function to regulate the time between measurement report transmissions.
  • this time to trigger parameter may be statically configured/defined, regardless of a velocity of the UE.
  • static time to trigger parameter may cause a situation in which the UE loses service associated with the serving cell before the UE is able to transmit a measurement report to the serving cell to initiate a handover. Therefore, aspects of the present disclosure provide techniques for improving handovers in wireless network by determining a parameter for triggering measurement report transmission associated with a mobility event based on a velocity associated with the UE.
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support a particular radio access technology (RAT) and may operate on one or more frequencies.
  • RAT may also be referred to as a radio technology, an air interface, etc.
  • a frequency may also be referred to as a carrier, a subcarrier, a frequency channel, a tone, a subband, etc.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • the techniques described herein may be used for various wireless networks and radio technologies. While aspects may be described herein using terminology commonly associated with 3G, 4G, and/or new radio (e.g., 5G NR) wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems.
  • 3G, 4G, and/or new radio e.g., 5G NR
  • NR access may support various wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g., 80 MHz or beyond) , millimeter wave (mmW) targeting high carrier frequency (e.g., 25 GHz or beyond) , massive machine type communications MTC (mMTC) targeting non-backward compatible MTC techniques, and/or mission critical targeting ultra-reliable low-latency communications (URLLC) .
  • eMBB enhanced mobile broadband
  • mmW millimeter wave
  • mMTC massive machine type communications MTC
  • URLLC ultra-reliable low-latency communications
  • These services may include latency and reliability requirements.
  • These services may also have different transmission time intervals (TTI) to meet respective quality of service (QoS) requirements.
  • TTI transmission time intervals
  • QoS quality of service
  • these services may co-exist in the same subframe.
  • NR supports beamforming and beam direction may be dynamically configured. MIMO transmissions with precoding may also be supported.
  • MIMO configurations in the DL may support up to 8 transmit antennas with multi-layer DL transmissions up to 8 streams and up to 2 streams per UE. Multi-layer transmissions with up to 2 streams per UE may be supported. Aggregation of multiple cells may be supported with up to 8 serving cells.
  • FIG. 1 illustrates an example wireless communication network 100 in which aspects of the present disclosure may be performed.
  • the wireless communication network 100 may be an NR system (e.g., a 5G NR network) .
  • the wireless communication network 100 may be in communication with a core network 132.
  • the core network 132 may in communication with one or more base station (BSs) 110 and/or user equipment (UE) 120 in the wireless communication network 100 via one or more interfaces.
  • BSs base station
  • UE user equipment
  • the wireless communication network 100 may include a number of BSs 110a-z (each also individually referred to herein as BS 110 or collectively as BSs 110) and other network entities.
  • a BS 110 may provide communication coverage for a particular geographic area, sometimes referred to as a “cell” , which may be stationary or may move according to the location of a mobile BS 110.
  • the BSs 110 may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in wireless communication network 100 through various types of backhaul interfaces (e.g., a direct physical connection, a wireless connection, a virtual network, or the like) using any suitable transport network.
  • backhaul interfaces e.g., a direct physical connection, a wireless connection, a virtual network, or the like
  • the BSs 110a, 110b and 110c may be macro BSs for the macro cells 102a, 102b and 102c, respectively.
  • the BS 110x may be a pico BS for a pico cell 102x.
  • the BSs 110y and 110z may be femto BSs for the femto cells 102y and 102z, respectively.
  • a BS may support one or multiple cells.
  • a network controller 130 may couple to a set of BSs 110 and provide coordination and control for these BSs 110 (e.g., via a backhaul) .
  • the BSs 110 communicate with UEs 120a-y (each also individually referred to herein as UE 120 or collectively as UEs 120) in the wireless communication network 100.
  • the UEs 120 (e.g., 120x, 120y, etc. ) may be dispersed throughout the wireless communication network 100, and each UE 120 may be stationary or mobile.
  • Wireless communication network 100 may also include relay stations (e.g., relay station 110r) , also referred to as relays or the like, that receive a transmission of data and/or other information from an upstream station (e.g., a BS 110a or a UE 120r) and sends a transmission of the data and/or other information to a downstream station (e.g., a UE 120 or a BS 110) , or that relays transmissions between UEs 120, to facilitate communication between devices.
  • relay stations e.g., relay station 110r
  • relays or the like that receive a transmission of data and/or other information from an upstream station (e.g., a BS 110a or a UE 120r) and sends a transmission of the data and/or other information to a downstream station (e.g., a UE 120 or a BS 110) , or that relays transmissions between UEs 120, to facilitate communication between devices.
  • the BSs 110 and UEs 120 may be configured for improving handovers in a wireless network.
  • the BS 110a may include a mobility manager 112.
  • the mobility manager 112 may be configured to perform the operations illustrated in one or more of FIGs. 4 or 6, as well as other operations disclosed herein for improving handovers in a wireless network, in accordance with aspects of the present disclosure.
  • the UE 120a includes a mobility manager 122.
  • the mobility manager 122 may be configured to perform the operations illustrated in FIG. 5, as well as other operations disclosed herein for improving handovers in a wireless network, in accordance with aspects of the present disclosure.
  • FIG. 2 illustrates example components of BS 110a and UE 120a (e.g., in the wireless communication network 100 of FIG. 1) , which may be used to implement aspects of the present disclosure.
  • a transmit processor 220 may receive data from a data source 212 and control information from a controller/processor 240.
  • the control information may be for the physical broadcast channel (PBCH) , physical control format indicator channel (PCFICH) , physical hybrid ARQ indicator channel (PHICH) , physical downlink control channel (PDCCH) , group common PDCCH (GC PDCCH) , etc.
  • the data may be for the physical downlink shared channel (PDSCH) , etc.
  • a medium access control (MAC) -control element (MAC-CE) is a MAC layer communication structure that may be used for control command exchange between wireless nodes.
  • the MAC-CE may be carried in a shared channel such as a physical downlink shared channel (PDSCH) , a physical uplink shared channel (PUSCH) , or a physical sidelink shared channel (PSSCH) .
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • PSSCH physical sidelink shared channel
  • the processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively.
  • the transmit processor 220 may also generate reference symbols, such as for the primary synchronization signal (PSS) , secondary synchronization signal (SSS) , and channel state information reference signal (CSI-RS) .
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) 232a-232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream.
  • MIMO multiple-input multiple-output
  • Each modulator may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • Downlink signals from modulators 232a-232t may be transmitted via the antennas 234a-234t, respectively.
  • the antennas 252a-252r may receive the downlink signals from the BS 110a and may provide received signals to the demodulators (DEMODs) in transceivers 254a-254r, respectively.
  • Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples.
  • Each demodulator may further process the input samples (e.g., for OFDM, etc. ) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from all the demodulators 254a-254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 120a to a data sink 260, and provide decoded control information to a controller/processor 280.
  • a transmit processor 264 may receive and process data (e.g., for the physical uplink shared channel (PUSCH) ) from a data source 262 and control information (e.g., for the physical uplink control channel (PUCCH) from the controller/processor 280.
  • the transmit processor 264 may also generate reference symbols for a reference signal (e.g., for the sounding reference signal (SRS) ) .
  • the symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the modulators in transceivers 254a-254r (e.g., for SC-FDM, etc. ) , and transmitted to the BS 110a.
  • the uplink signals from the UE 120a may be received by the antennas 234, processed by the modulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 120a.
  • the receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller/processor 240.
  • the memories 242 and 282 may store data and program codes for BS 110a and UE 120a, respectively.
  • a scheduler 244 may schedule UEs for data transmission on the downlink and/or uplink.
  • Antennas 252, processors 266, 258, 264, and/or controller/processor 280 of the UE 120a and/or antennas 234, processors 220, 230, 238, and/or controller/processor 240 of the BS 110a may be used to perform the various techniques and methods described herein for NR PDCCH repetition.
  • the controller/processor 240 of the BS 110a includes a mobility manager 241 that may be configured to perform the operations illustrated in one or more of FIGs. 4 or 6, as well as other operations disclosed herein for improving handovers in a wireless network, in accordance with aspects of the present disclosure. As shown in FIG.
  • the controller/processor 280 of the UE 120a includes mobility manager 281 that may be configured to perform the operations illustrated in FIG. 5, as well as other operations disclosed herein for improving handovers in a wireless network, in accordance with aspects of the present disclosure. Although shown at the Controller/Processor, other components of the UE 120a and BS 110a may be used performing the operations described herein.
  • NR may utilize orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) on the uplink and downlink.
  • OFDM orthogonal frequency division multiplexing
  • CP cyclic prefix
  • NR may support half-duplex operation using time division duplexing (TDD) .
  • OFDM and single-carrier frequency division multiplexing (SC-FDM) partition the system bandwidth into multiple orthogonal subcarriers, which are also commonly referred to as tones, bins, etc. Each subcarrier may be modulated with data. Modulation symbols may be sent in the frequency domain with OFDM and in the time domain with SC-FDM.
  • the spacing between adjacent subcarriers may be fixed, and the total number of subcarriers may be dependent on the system bandwidth.
  • the minimum resource allocation may be 12 consecutive subcarriers.
  • the system bandwidth may also be partitioned into subbands. For example, a subband may cover multiple RBs.
  • NR may support a base subcarrier spacing (SCS) of 15 KHz and other SCS may be defined with respect to the base SCS (e.g., 30 kHz, 60 kHz, 120 kHz, 240 kHz, etc. ) .
  • SCS base subcarrier spacing
  • FIG. 3 is a diagram showing an example of a frame format 300 for NR.
  • the transmission timeline for each of the downlink and uplink may be partitioned into units of radio frames.
  • Each radio frame may have a predetermined duration (e.g., 10 ms) and may be partitioned into 10 subframes, each of 1 ms, with indices of 0 through 9.
  • Each subframe may include a variable number of slots (e.g., 1, 2, 4, 8, 16, ...slots) depending on the SCS.
  • Each slot may include a variable number of symbol periods (e.g., 7 or 14 symbols) depending on the SCS.
  • the symbol periods in each slot may be assigned indices.
  • a mini-slot which may be referred to as a sub-slot structure, refers to a transmit time interval having a duration less than a slot (e.g., 2, 3, or 4 symbols) .
  • Each symbol in a slot may indicate a link direction (e.g., DL, UL, or flexible) for data transmission and the link direction for each subframe may be dynamically switched.
  • the link directions may be based on the slot format.
  • Each slot may include DL/UL data as well as DL/UL control information.
  • a user equipment may communicate with a serving cell in a wireless network, such as a self-organizing fifth generation (5G) network. While communicating, the UE may perform measurements on one or more reference signals (RSs) from the serving cell and one or more non-serving cells. These measurements may be reported to the serving cell and used to make mobility decisions for the UE, such as whether the UE should be handed over to the one or more non-serving cells. Transmission of these measurement reports may be based on one or more triggers.
  • RSs reference signals
  • a first measurement reporting trigger (e.g., A1) may occur when the serving cell becomes better than a threshold.
  • a second measurement reporting trigger (e.g., A2) may occur when the serving cell becomes worse than a threshold.
  • a third measurement reporting trigger (e.g., A3) may occur when a neighbor cell becomes better than the primary serving cell by an offset value.
  • a fourth measurement reporting trigger (e.g., A4) may occur when a neighbor cell becomes better than a threshold.
  • a fifth measurement reporting trigger (e.g., A5) may occur when the primary serving cell becomes worse than a threshold and a neighbor cell is simultaneously better than another (e.g., higher) threshold.
  • a sixth measurement reporting trigger may occur when a neighbor cell becomes better than a secondary serving cell by an offset value.
  • a seventh measurement reporting trigger (e.g., B1) may occur when a neighbor using a different radio access technology (RAT) becomes better than a threshold.
  • An eighth measurement reporting trigger (e.g., B2) may occur when a primary serving cell becomes worse than a threshold and the inter-RAT neighbor becomes better than another threshold.
  • RAT radio access technology
  • these measurement reporting triggers may be configured based on one or more mobility parameters.
  • the A3 measurement reporting trigger may be associated with mobility parameters such as an offset parameter, a hysteresis parameter, and a time to trigger parameter.
  • the function of the offset parameter and the hysteresis parameters is to help prevent the UE from transmitting measurement reports for small fluctuations in RS measurements between the serving cell and a non-serving cell.
  • the offset parameter may be applied by the UE to a current serving cell RS measurement to make the serving cell appear better than the non-serving cell while the hysteresis parameter may be applied by the UE to a current non-serving cell RS measurement.
  • the offset parameter and hysteresis parameter function to ensure that the non-serving cell is, in fact, stronger that the serving cell (e.g., rather than some small fluctuation) before the UE decides to send a measurement report to initiate a handover.
  • the time to trigger parameter may be used to initialize a timer that functions to prevent the UE from transmitting a measurement report too frequently (e.g., before expiration of the timer) , helping avoid a ping-pong effect in which the UE is rapidly handed back and for between cells.
  • this time to trigger parameter may be statically configured, which can cause issues with handovers for high velocity UEs. For example, normally, when a UE travels from a serving cell into a non-serving cell at a low velocity (e.g., below a threshold) , this low velocity allows the timer associated with the measurement report to expire before the UE loses service associated with the serving cell, allowing the UE to transmit the measurement report to the serving cell and to be seamlessly handed over to the non-serving cell.
  • a low velocity e.g., below a threshold
  • aspects of the present disclosure provide techniques for improving handovers in wireless networks, such as a self-organizing 5G network, by dynamically adapting the time to trigger parameter for a UE based on a velocity associated with the UE.
  • the UE may be configured with an adjusted time to trigger parameter (or an adjustment value to apply to an already configured time to trigger parameter) that allows the UE to transmit measurement reports more frequently in time, avoiding the situation where the UE may lose service from a serving cell before the UE is allowed to transmit a measurement report to trigger a handover to a non-serving cell.
  • FIG. 4 is a flow diagram illustrating example operations 400 for wireless communication, in accordance with certain aspects of the present disclosure.
  • the operations 400 may be performed, for example, by a network node, such as a BS (e.g., BS 110a in the wireless communication network 100) .
  • Operations 400 may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor 240 of FIG. 2) .
  • the transmission and reception of signals by the BS in operations 400 may be enabled, for example, by one or more antennas (e.g., antennas 234 of FIG. 2) .
  • the transmission and/or reception of signals by the BS may be implemented via a bus interface of one or more processors (e.g., controller/processor 240) obtaining and/or outputting signals.
  • the operations 400 may begin, at 402, by determining a velocity associated with a user equipment (UE) .
  • UE user equipment
  • the BS determines, based on the determined velocity associated with the UE, a parameter for triggering a measurement report transmission associated with a mobility event.
  • the BS transmits configuration information to the UE, including the parameter for triggering the measurement report.
  • FIG. 5 is a flow diagram illustrating example operations 500 for wireless communication, in accordance with certain aspects of the present disclosure.
  • the operations 500 may be performed, for example, by UE (e.g., such as a UE 120a in the wireless communication network 100) .
  • the operations 500 may be complimentary operations by the UE to the operations 400 performed by the BS.
  • 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 502, transmitting one or more reference signals (RSs) to a base station (BS) indicating a velocity associated with the UE.
  • RSs reference signals
  • BS base station
  • the UE receives configuration information from the BS, including a parameter for triggering a measurement report transmission associated with a mobility event, wherein the parameter is based on the one or more RSs and the velocity associated with the UE
  • aspects of the present disclosure provide techniques for determining a parameter for triggering a measurement report transmission associated with a mobility event, based on a velocity of a UE, and transmitting configuration information to the UE, including the parameter for triggering the measurement report.
  • the BS may determine a velocity associated with the UE, may be based on one or more reference signals transmitted by the UE.
  • the UE may transmit one or more demodulation reference signals (DMRSs) on a physical uplink shared channel, which may be received by the BS. Based on the one or more DMRSs, the BS may determine the velocity associated with the UE.
  • DMRSs demodulation reference signals
  • the BS may determine the parameter for triggering the measurement report transmission associated with the mobility event.
  • the parameter for triggering the measurement report transmission associated with the mobility event may comprise a parameter associated with an A3 mobility event described above.
  • the BS may transmit configuration information to the UE, including the parameter for triggering the measurement report.
  • the parameter transmitted in the configuration information may comprise an adjusted timer value (e.g., an adjusted timer to trigger parameter) for triggering the measurement report transmission associated with the mobility event by the UE.
  • the adjusted timer value may comprise a timer value that has been adjusted by an adjustment value (e.g., K) relative to a pre-defined timer value (e.g., a pre-defined time to trigger parameter) for triggering the measurement report transmission by the UE.
  • the parameter transmitted in the configuration information may comprise the adjustment value that may be used by the UE to adjust an already configured timer value (e.g., to adjust a previously configured time to trigger parameter) .
  • the adjusted timer value may be determined based on an adjustment value applied to the pre-defined timer value.
  • the BS may determine an adjustment value to apply to the pre-defined timer value and determine the adjusted timer value by applying the adjustment value to the pre-defined timer value.
  • the BS may determine the adjusted timer value by multiplying the timer value and the adjustment value.
  • the adjustment value may comprise a value between zero and one and may depend on the velocity associated with the UE.
  • the BS may determine whether the velocity associated with the UE is equal to or exceeds a threshold velocity.
  • the BS may set the adjustment value to a first value (e.g., 1) , allowing the UE to use a pre-defined timer value (e.g., a pre-defined time to trigger parameter) .
  • a value less than one may reduce the timer associated with transmission of a measurement report by the UE, allowing the UE to transmit measurement reports more-quickly when traveling at a high velocity and helping prevent the described scenario above where the UE is not able to transmit the measurement report when moving to a non-serving cell before losing service associated with a serving cell.
  • the second value may be selected, based on the velocity of the UE, such that enough time is afforded for the timer associated with the measurement report to expire before the UE loses service from the serving cell when traveling to a non-serving cell at a high velocity.
  • the UE may apply the determined adjustment value to the pre-defined timer value to determine the adjusted timer value.
  • the BS may then transmit the adjusted timer value in the configuration information to the UE.
  • the BS may transmit the configuration information to the UE including the adjustment value.
  • the UE may receive the adjustment value and, in some cases, apply the adjustment value to the pre-defined timer value (e.g., a pre-configured time to trigger parameter) to determine an adjusted timer value for triggering the measurement report.
  • the UE may apply the adjustment value to the pre-defined timer value by multiplying the timer value and the adjustment value.
  • the UE may perform measurements on one or more reference signals from the serving cell and one or more non-serving cells.
  • the UE may detect a mobility event, such as an A3 event in which the non-serving cell becomes better than the serving cell by an offset value.
  • the UE may transmit a measurement report to the BS associated with the detected mobility event based on the parameter received in the configuration information.
  • the UE may determine whether a timer associated with transmission of the measurement report (e.g., which may be initialized according to the adjusted timer value received in the configuration information or determined by the UE based on the adjustment value received in the configuration information) has expired. According to aspects, if the timer associated with transmission of the measurement report has expired, the UE may proceed with transmitting the measurement report to the serving BS indicating the detected A3 mobility event. As noted, while the UE is traveling at a velocity equal to or exceeding the threshold velocity, the adjusted timer value may afford the UE enough time to transmit the measurement report to the serving BS before losing service associated with the serving BS, as described above.
  • a timer associated with transmission of the measurement report e.g., which may be initialized according to the adjusted timer value received in the configuration information or determined by the UE based on the adjustment value received in the configuration information
  • FIG. 6 is a decision flow diagram illustrating example operations 600 for determining the parameter for triggering the measurement report, according to certain aspects presented herein.
  • the operations 600 begin at 602 with the BS monitoring one or more reference signals from the UE and determining a velocity of the UE based on the one or more monitored reference signals.
  • the RSs may comprise demodulation reference signals (DMRSs) transmitted by the UE on a physical uplink shared channel (PUSCH) .
  • DMRSs demodulation reference signals
  • the BS may determine whether the velocity associated with the UE is greater than or equal to a threshold velocity (e.g., velocity_threshold) .
  • a threshold velocity e.g., velocity_threshold
  • a pre-defined timer value e.g., a pre-defined time to trigger (TTT) parameter
  • the UE may determine the parameter for triggering the measurement report by applying the adjustment value to the pre-defined timer value.
  • the BS may transmit configuration information to the UE, including the parameter for triggering the measurement report.
  • the parameter may include the adjusted timer value or may include the adjustment value that the UE may apply to the pre-defined timer value.
  • 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 FIGs. 4 and 6.
  • 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 FIGs. 4 and 6, as well as other operations described herein for improving handovers in wireless networks.
  • computer-readable medium/memory 712 stores code 714 for determining, based on the determined velocity of the UE, code 716 for determining a parameter for triggering a measurement report transmission associated with a mobility event; and code 718 for transmitting configuration information to the UE, including the parameter for triggering the measurement report.
  • the processor 704 includes circuitry 720 for determining, based on the determined velocity of the UE, circuitry 722 for determining a parameter for triggering a measurement report transmission associated with a mobility event; and circuitry 724 for transmitting configuration information to the UE, including the parameter for triggering the measurement report.
  • FIG. 8 illustrates a communications device 800 that may include various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein, such as the operations illustrated in FIG. 5 as well as other operations disclosed herein for improving handovers in wireless networks.
  • 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 FIG. 5, as well as other operations described herein for improving handovers in wireless networks.
  • computer-readable medium/memory 812 stores code 814 for transmitting one or more reference signals (RSs) to a base station (BS) indicating a velocity associated with the UE; and code 816 for receiving configuration information from the BS, including a parameter for triggering a measurement report transmission associated with a mobility event, wherein the parameter is based on the one or more RSs and the velocity associated with the UE.
  • RSs reference signals
  • BS base station
  • the processor 804 includes circuitry 818 for transmitting one or more reference signals (RSs) to a base station (BS) indicating a velocity associated with the UE; and circuitry 820 for receiving configuration information from the BS, including a parameter for triggering a measurement report transmission associated with a mobility event, wherein the parameter is based on the one or more RSs and the velocity associated with the UE.
  • RSs reference signals
  • BS base station
  • 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 FIGs. 4-6.
  • 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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  • Computer Networks & Wireless Communication (AREA)
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Abstract

Certains aspects de l'invention concernent des techniques d'amélioration des transferts dans des réseaux sans fil. Un procédé qui peut être mis en œuvre par une station de base (BS) consiste à déterminer une vitesse associée à un équipement utilisateur, à déterminer, sur la base de la vitesse déterminée de l'UE, un paramètre pour déclencher une transmission de rapport de mesure associée à un événement de mobilité, et à transmettre des informations de configuration à l'UE, comprenant le paramètre pour déclencher le rapport de mesure.
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