WO2014110758A1 - Type de signal de référence pouvant être configuré pour mesure rrm/rlm - Google Patents

Type de signal de référence pouvant être configuré pour mesure rrm/rlm Download PDF

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Publication number
WO2014110758A1
WO2014110758A1 PCT/CN2013/070603 CN2013070603W WO2014110758A1 WO 2014110758 A1 WO2014110758 A1 WO 2014110758A1 CN 2013070603 W CN2013070603 W CN 2013070603W WO 2014110758 A1 WO2014110758 A1 WO 2014110758A1
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WO
WIPO (PCT)
Prior art keywords
reference signal
measurements
different
reference signals
resource management
Prior art date
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PCT/CN2013/070603
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English (en)
Inventor
Wei Bai
Erlin Zeng
Haiming Wang
Pengfei Sun
Jing HAN
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Broadcom Corporation
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Publication date
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Priority to PCT/CN2013/070603 priority Critical patent/WO2014110758A1/fr
Publication of WO2014110758A1 publication Critical patent/WO2014110758A1/fr

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Classifications

    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters

Definitions

  • the exemplary and non-limiting embodiments of this invention relate generally to wireless communication systems, methods, devices and computer programs and, more specifically, relate to reference signals used for radio resource management (RRM) and/or radio link monitoring (RLM), such as for example as may be used with a new carrier type for Release 12 of the evolved Universal Terrestrial Radio Access Network (E-UTRAN, sometimes known as long term evolution LTE of UTRAN).
  • RRM radio resource management
  • RLM radio link monitoring
  • the common reference signal (CRS) will be always transmitted and the user equipment (UE) will always do radio resource management (RRM) and/or radio link monitoring (RLM) measurement based on the CRS.
  • RRM radio resource management
  • RLM radio link monitoring
  • a newly defined discovery channel could be used to enable fast cell discovery.
  • the main purpose of such a channel appears to have been to aggregate the functionality of different downlink physical channels such as the primary and secondary synchronization signal (PSS/SS), the CRS, and others in order to enable a faster process for cell selection/re- selection or for cell identification. It is also possible to design the physical downlink channel (PDCH) to support RRM/RLM measurements.
  • PSS/SS primary and secondary synchronization signal
  • CRS cell selection/re- selection or for cell identification.
  • PDCH physical downlink channel
  • LTE Release 12 is also contemplating a new type of component carrier (commonly referred to within the 3GPP community as a new carrier type or NCT). Unlike other carriers that may be fully backward compatible with Release 8 or that may have a full complement of control and data channels, the new carrier type may have completely CRS-free operation. [0005] The design of this new carrier type is to meet several targets, one of which is to reduce the broadcasted cell-specific reference signal (CS-RS) and another one of which is to support a new eNB sleep mode.
  • CS-RS broadcasted cell-specific reference signal
  • Figure 1 reproduces some examples presented in a request for proposals document RP-121186 by Qualcomm entitled ON REL-12 NCT [3GPP TSG RAN #57; Chicago, USA; 4-7 September 2012].
  • option #1 there is a reduced density of the CRSs that the eNB transmits.
  • Option #2 is fully backward compatible in that the fully loaded (e.g., macro) cell will be always broadcasting the CRS and any dormant small/pico cells will be broadcasting a periodic cell identification signal.
  • a method for controlling a radio network access node comprises: determining that regularly- spaced common reference signals are not available for a user equipment (UE) to take radio resource management measurements and/or radio link monitoring measurements; and in response to so determining, configuring the UE for a different type of reference signal other than regularly-spaced common reference signals, or a physical channel, to use for taking its radio resource management measurements and/or radio link monitoring measurements.
  • UE user equipment
  • the apparatus comprises a processing system, and the processing system comprises at least one processor and a memory storing a set of computer instructions.
  • the processing system is configured to cause the apparatus at least to: configure a user equipment (UE) for a different type of reference signal other than regularly- spaced common reference signals, or a physical channel, to use for taking its radio resource management measurements and/or radio link monitoring measurements.
  • UE user equipment
  • a computer readable memory tangibly storing a set of computer executable instructions for controlling a radio network access node.
  • the set of computer executable instructions comprises: code for configuring a user equipment (UE) for a different type of reference signal other than regularly- spaced common reference signals, or a physical channel, to use for taking its radio resource management measurements and/or radio link monitoring measurements.
  • UE user equipment
  • a method for controlling a user equipment comprises: determining that regularly- spaced common reference signals are not available for radio resource management measurements and/or radio link monitoring measurements; and in response to so determining, controlling the UE to select, using a predefined criteria, a different reference signal type other than regularly- spaced common reference signals, or a physical channel, for the radio resource management measurements and/or radio link monitoring measurements.
  • a predefined criteria e.g., a different reference signal type other than regularly- spaced common reference signals, or a physical channel
  • the processing system is configured to cause the apparatus at least to: select by the UE, using a predefined criteria, a different reference signal type other than regularly- spaced common reference signals, or a physical channel, for radio resource management measurements and/or radio link monitoring measurements.
  • a computer readable memory tangibly storing a set of computer executable instructions for controlling a user equipment (UE).
  • the set of computer executable instructions comprises: code for the UE to select, using a predefined criteria, a different reference signal type other than regularly- spaced common reference signals, or physical channel, for radio resource management measurements and/or radio link monitoring measurements.
  • Figure 1 is a reproduction from a prior art document showing different active and dormant states for an eNB during which a user equipment (UE) should still be enabled to take RRM/RLM measurements despite that a cell is not always transmitting a CRS.
  • Figure 2 is a high level schematic diagram of a heterogeneous network in which one or more of the small/pico cells can go into a sleep or dormant mode, and is one exemplary environment in which these teachings may be practiced to advantage.
  • Figure 3 illustrates an EUTRA Measurement Object information element modified according to an exemplary but non-limiting embodiment of these teachings to add the shaded rows for specifying which type of reference signal for the UE to use for its RRM/RLM measurements.
  • Figures 4-5 are logic flow diagrams that illustrate a method for operating a network access node and a user equipment/UE respectively, and a result of execution by an apparatus of a set of computer program instructions embodied on a computer readable memory for operating such a respective access node and UE, in accordance with certain exemplary embodiments of this invention.
  • Figure 6 is a simplified block diagram of a UE, and a cellular network represented by an eNB and by a MME, which are exemplary electronic devices suitable for use in practicing the exemplary embodiments of the invention.
  • E- UTRAN evolved UTRAN system
  • LTE long term evolution
  • RATs radio access technologies
  • WCDMA wideband code division multiple access
  • the eNB wants to let the UE do RRM/RLM measurements based on CSI-RS, or based on the physical downlink channel PDCH.
  • the RRM/RLM measurement is based on CRSs.
  • Embodiments of these teachings can be applied for use with the anticipated LTE Release 12 new carrier type, and specifically for handling the related RRM/RLM measurement for this new carrier type.
  • the new carrier type design may have a CRS-free operation, and use CSI-RS instead for channel estimation.
  • the third generation partnership project 3GPP will introduce a new downlink physical channel named PDCH for cell discovery purposes. According to these teachings this new PDCH can also be used for RRM/RLM measurements in some cases.
  • the network access node could configure the UE for which reference signal type and/or channel is to be used as the RRM/RLM measurement. If the UE needs to compare the measurement result from different cells/carriers, for example to compare measurements taken on a legacy carrier and measurements taken on the new carrier type where different reference signals or channels are measured, the eNB could also configure an offset value to enable the UE to properly compare those different measurement results. Detailed further below is an alternative in which there are pre-defined rules which allow the UE to do its RRM/RLM measurements based on those rules.
  • Figure 2 illustrates a heterogeneous network in which one or more of the small/pico cells can go into a sleep or dormant mode, such as for example during certain times when traffic is light and the excess capacity enabled by one or more of the pico cells is not needed.
  • the pico cell is in a dormant state (see three example active/dormant state options at Figure 1) and will no longer be transmitting its CRS according to a regular spacing as it always does in legacy LTE systems.
  • the pico cell is operating with the new carrier type and regularly- spaced CRS may not be available even when the pico cell is in an active state.
  • Figure 2 illustrates an exemplary radio environment in which these teachings may be practiced to advantage.
  • Figure 3 is an E-UTRA measurement object information element (termed as MeasObjectEUTRA) which is modified according to these teachings to include the two shaded rows of information 302, 304 by which the eNB specifies to the UE what type of reference signal it should use for measuring RRM/RLM.
  • the eNB can send this MeasObjectEUTRA information element to the UE in order to configure it to do RRM/RLM measurements based on a different RS type or physical channel.
  • This first example embodiment is detailed further with respect to Figure 4, which recites from the perspective of the eNB.
  • the radio network access node determines that regularly-spaced common reference signals are not available for a user equipment (UE) to take radio resource management measurements and/or radio link monitoring measurements; and in response to the block 402 determining the radio network access node is controlled at block 404 to configure the UE for a different type of reference signal other than regularly- spaced common reference signals, or a physical channel, to use for taking its radio resource management measurements and/or radio link monitoring measurements.
  • the MeasObjectEUTRA information element modified as shown at Figure 3 or similarly, can be used in one implementation to configure the UE in this manner. In this way the eNB could configure the measurement reference signal type together with the signaling that is used to configure the measurement object for the UE.
  • the eNB will know its active/dormant mode pattern in advance and from that pattern can determine when it will cease sending regularly-spaced CRSs to the UE.
  • the radio network access node is an eNB operating which, when performing Figure 4, is operating in an evolved Universal Terrestrial Access Radio Network (E-UTRAN).
  • E-UTRAN evolved Universal Terrestrial Access Radio Network
  • the different RS type includes at least CRS, CSI-RS, or CRS with reduced density, or a different RS pattern taking the active/dormant state into account.
  • the eNB could also configure the UE to use the PDCH to do its RRM/RLM measurements.
  • the different type of reference signal, or physical channel, recited at block 404 are detailed at block 406 as comprising one of: a) channel state information reference signals (CSI-RS); b) physical downlink channel (PDCH); c) non-regularly- spaced common reference signals transmitted with reduced density as compared to legacy regularly- spaced common reference signals (legacy being from the earliest priority date of this application); and d) a reference signal transmitted according to a pattern that accounts for a dormant state of the network access node.
  • CSI-RS channel state information reference signals
  • PDCH physical downlink channel
  • c non-regularly- spaced common reference signals transmitted with reduced density as compared to legacy regularly- spaced common reference signals (legacy being from the earliest priority date of this application)
  • a reference signal transmitted according to a pattern that accounts for a dormant state of the network access node a pattern that accounts for a dormant state of the network access node.
  • the eNB could also configure
  • Block 408 of Figure 4 summarizes this option; configuring the UE for the different type of reference signal, or physical channel, as first recited at block 404 is at block 408 configuring the UE for different types of reference signals or different physical channels for different measurement purposes.
  • the eNB could configure the UE that for different measurement purpose, the UE could use different reference signal type or different downlink physical channels; for example the UE could be configured to use CSI-RS to do CQI measurements; and to use CRS to do RLM measurements, and to use the PDCH to do RRM measurements.
  • the eNB could in another embodiment configure an offset value between the measurement results based on different RS types if for example the UE needs to compare the measurement result from different cells to evaluate if any measurement report event is triggered.
  • Block 410 specifies this also as the eNB indicating to the UE an offset value for comparing measurement results taken from different cells using different types of reference signals or different physical channels.
  • this offset value if the UE needs to evaluate event A3, if the measurement result of a neighbor cell is based on the PDCH but the primary cell PCell is using CRS, the UE needs to add an additional n dB to the final result to compare, where the value for n is the offset that is configured by the eNB.
  • the network access node can configure the UE for the different type of reference signal by configuring or enabling the UE to select itself the different type of reference signal to use for taking its RRM and/or RLM measurements; or in another embodiment by configuring the UE with a pre-defined prioritized order of reference signal types from which to select for taking the UE's own RRM and/or RLM measurements; or by configuring the UE with a predefined threshold (such as for example a signal quality threshold) for selecting which type of reference signal to use for taking its RRM and/or RLM measurements.
  • a predefined threshold such as for example a signal quality threshold
  • the UE could select the reference signal type (or physical channel) to do its RRM/RLM measurements.
  • a second example embodiment of these teachings is detailed with respect to Figure 5, which recites from the perspective of the UE.
  • the UE determines that regularly- spaced common reference signals are not available for radio resource management measurements and/or radio link monitoring measurements; and in response to so determining then at block 504 the UE is controlled (by some implementing hardware and/or software within the UE itself) to select, using a predefined criteria, a different reference signal type other than regularly- spaced common reference signals, or a physical channel, for the radio resource management measurements and/or radio link monitoring measurements.
  • the UE can be informed that the eNB will be entering a dormant mode (such as via system information or other type of downlink signaling) and from that the UE can determine when it should begin using some other type of reference signal for RRM/RLM measurements.
  • a dormant mode such as via system information or other type of downlink signaling
  • the predefined criteria on which the UE can base this selection on is in one embodiment a predefined priority order among the different reference signal types, or a default reference signal type can be predefined in case there UE finds multiple reference signal types.
  • the predefined criteria comprises a predefined priority order among a plurality of different reference signal types.
  • the plurality of different reference signal types, or physical channel, for Figure 5 can be those specified at block 406 of Figure 4, namely: CSI-RS; PDCH; non-re gularly- spaced common reference signals transmitted with reduced density as compared to legacy regularly- spaced common reference signals; and a reference signal transmitted according to a pattern that accounts for a dormant state of the network access node.
  • the predefined criteria is a predefined threshold of density of certain reference signals, so that for example if the density of reference signal type A is lower than the threshold X then it shall not be used.
  • the value X for the threshold may be defined in a radio protocol/specification.
  • Block 508 of Figure 5 summarized this option; the predefined criteria comprises a predefined minimum threshold transmission density of a particular reference signal type.
  • the different criteria set forth at blocks 506 and 508 of Figure 5 can also be combined. And as was detailed above for Figure 4 at block 410, the UE operating according to Figure 5 can also use an offset value that it receives from the network/eNB to compare measurement results that it has taken from different cells using different types of reference signals.
  • the predefined criteria can be: signaling received from a network access node which configures which type of reference signal for the UE to use for the RRM and/or RLM measurements; or it can in another embodiment be signaling received from a network access node which configures the UE to select itself the different type of reference signal to use for the RRM and/or RLM measurements; or in a still further embodiment it can be signaling received from a network access node which configures the UE with a priority or rule for selecting which type of reference signal to use for the RRM and/or RLM measurements, or in another embodiment it can be signaling received from a network access node which configures the UE with a threshold (such as a signal quality threshold) for selecting which type of reference signal to use for the RRM and/or RLM measurements.
  • a threshold such as a signal quality threshold
  • Embodiments of these teachings provide the technical effect of enabling the UE to do measurements based on different reference signal types or downlink physical channels, which could make the evolution of the LTE system easier and more backward compatible at the same time. Embodiments of these teachings provide the further technical effect of providing more flexibility for the network operator to deploy the network based on the traffic needs.
  • the logic diagrams of Figures 4-5 may be considered to each illustrate the operation of a method, and a result of execution of a computer program stored in a computer readable memory, and a specific manner in which components of an electronic device are configured to cause that electronic device to operate, whether such an electronic device is the eNB, or the UE, or one or more components of either such as a modem, chipset, or the like.
  • the various blocks shown in each of Figures 4-5 may also be considered as a plurality of coupled logic circuit elements constructed to carry out the associated function(s), or specific result of strings of computer program code or instructions stored in a memory.
  • Such blocks and the functions they represent are non-limiting examples, and may be practiced in various components such as integrated circuit chips and modules, and that the exemplary embodiments of this invention may be realized in an apparatus that is embodied as an integrated circuit.
  • the integrated circuit, or circuits may comprise circuitry (as well as possibly firmware) for embodying at least one or more of a data processor or data processors, a digital signal processor or processors, baseband circuitry and radio frequency circuitry that are configurable so as to operate in accordance with the exemplary embodiments of this invention.
  • circuit/circuitry embodiments include any of the following: (a) hardware-only circuit implementations (such as implementations in only analog and/or digital circuitry) and (b) combinations of circuits and software (and/or firmware), such as: (i) a combination of processor(s) or (ii) portions of processor(s)/software (including digital signal processor(s)), software, and memory(ies) that work together to cause an apparatus, such as a user equipment/UE, to perform the various functions summarized at Figures 4-5 and (c) circuits, such as a microprocessor(s) or a portion of a microprocessor(s), that require software or firmware for operation, even if the software or firmware is not physically present.
  • circuitry would also cover an implementation of merely a processor (or multiple processors) or portion of a processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example, a baseband integrated circuit or applications processor integrated circuit for a user equipment UE or for a network access node/eNB or a similar integrated circuit in a server or other network device which operates according to these teachings.
  • an eNB 22 is adapted for communication over a wireless link 21 with an apparatus, such as a mobile terminal or UE 20.
  • the eNB 22 may be any access node (including frequency selective repeaters) of any wireless network using licensed bands, such as LTE, LTE-A, GSM, GERAN, WCDMA, and the like.
  • the operator network of which the eNB 22 is a part may also include a network control element such as a mobility management entity MME and/or serving gateway SGW 24, or radio network controller RNC in the case of a UTRAN, either of which provide connectivity with the core cellular network and with further networks (e.g., a publicly switched telephone network PSTN and/or a data communications network/Internet).
  • a network control element such as a mobility management entity MME and/or serving gateway SGW 24, or radio network controller RNC in the case of a UTRAN, either of which provide connectivity with the core cellular network and with further networks (e.g., a publicly switched telephone network PSTN and/or a data communications network/Internet).
  • MME mobility management entity
  • SGW 24 serving gateway
  • RNC radio network controller
  • the UE 20 includes processing means such as at least one data processor (DP) 20A, storing means such as at least one computer-readable memory (MEM) 20B storing at least one computer program (PROG) 20C, and communication means such as a transmitter TX 20D and a receiver RX 20E for bidirectional wireless communications with the eNB 22 via one or more antennas 20F. Also stored in the MEM 20B at reference number 20G are the algorithms or look-up tables which enable the UE 20 to select which type of reference signal (RS) it should use for measuring RRM and/or RLM, according to the various embodiments described in further detail above.
  • RS reference signal
  • the eNB 22 also includes processing means such as at least one data processor (DP) 22A, storing means such as at least one computer-readable memory (MEM) 22B storing at least one computer program (PROG) 22C, and communication means such as a transmitter TX 22D and a receiver RX 22E for bidirectional wireless communications with the UE 20 via one or more antennas 22F.
  • the eNB 22 stores at block 22G its own algorithms/look-up tables for configuring the UE for a selected reference signal type for which the UE should use for measuring RRM and/or RLM, as are detailed above with particularity.
  • FIG. 6 also shows high level details of the MME 24, including processing means such as at least one data processor (DP) 24A, storing means such as at least one computer-readable memory (MEM) 24B storing at least one computer program (PROG) 24C, and communication means such as a modem 24H for bidirectional wireless communications with the eNB 22 via a data/control link 25.
  • processing means such as at least one data processor (DP) 24A
  • MEM computer-readable memory
  • PROG computer program
  • communication means such as a modem 24H for bidirectional wireless communications with the eNB 22 via a data/control link 25.
  • those devices are also assumed to include as part of their wireless communicating means a modem and/or a chipset which may or may not be inbuilt onto an RF front end chip within those devices 20, 22, and which may also operate according to the specific non-limiting examples set forth above.
  • At least one of the PROGs 20C in the UE 20 is assumed to include a set of program instructions that, when executed by the associated DP 20A, enable the device to operate in accordance with the exemplary embodiments of this invention, as detailed above.
  • the eNB 22 also has software stored in its MEM 22B to implement certain aspects of these teachings such as is also detailed above.
  • the exemplary embodiments of this invention may be implemented at least in part by computer software stored on the MEM 20B, 22B which is executable by the DP 20 A of the UE 20 and/or by the DP 22A of the eNB 22; or by hardware, or by a combination of tangibly stored software and hardware (and tangibly stored firmware) in any one or more of these devices 20, 22.
  • Electronic devices implementing these aspects of the invention need not be the entire devices as depicted at Figure 6 or may be one or more components of same such as the above described tangibly stored software, hardware, firmware and DP, or a system on a chip SOC or an application specific integrated circuit ASIC.
  • the various embodiments of the UE 20 can include, but are not limited to personal portable digital devices having wireless communication capabilities, including but not limited to cellular telephones, navigation devices, laptop/palmtop/tablet computers, digital cameras and music devices, and Internet appliances.
  • Various embodiments of the computer readable MEMs 20B, 22B include any data storage technology type which is suitable to the local technical environment, including but not limited to semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory, removable memory, disc memory, flash memory, DRAM, SRAM, EEPROM and the like.
  • Various embodiments of the DPs 20A, 22A include but are not limited to general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and multi-core processors.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention concerne, dans un mode de réalisation, un eNB qui configure un équipement utilisateur (UE) pour un type différent de signal de référence, autre que des signaux de référence courants (CRS) espacés régulièrement, ou un canal physique, à utiliser pour prendre ses mesures de gestion de ressources radio (RRM) et/ou ses mesures de surveillance de liaison radio (RLM). Dans un autre mode de réalisation, un UE sélectionne, à l'aide de critères prédéfinis (tel que l'ordre de priorité parmi différents types de signaux de référence ou la densité de transmission seuil minimale prédéfinie d'un type de signal de référence particulier), un type de signal de référence différent, autre que des signaux de référence courants espacés régulièrement, ou un canal physique, pour les mesures RRM/RLM. Cela est utile, notamment, dans EUTRAN Version 12, le nouveau type de porteuse pouvant ne pas disposer de CRS ou l'eNB pouvant être en mode dormant et ne pas transmettre de CRS espacés régulièrement.
PCT/CN2013/070603 2013-01-17 2013-01-17 Type de signal de référence pouvant être configuré pour mesure rrm/rlm WO2014110758A1 (fr)

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CN109842940B (zh) * 2017-11-27 2021-09-07 华为技术有限公司 一种链路恢复方法、终端设备及网络设备
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CN112534738A (zh) * 2018-08-10 2021-03-19 Oppo广东移动通信有限公司 一种参考信号测量配置方法、终端设备及网络设备
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CN112586022A (zh) * 2018-08-17 2021-03-30 上海诺基亚贝尔股份有限公司 针对基于ssb和csi-rs的rrm测量的测量间隙管理
CN112369064A (zh) * 2018-10-30 2021-02-12 松下电器（美国）知识产权公司 在缺失参考信号的情况下执行测量的用户设备
CN111615119A (zh) * 2019-04-30 2020-09-01 维沃移动通信有限公司 测量方法、配置方法、终端及网络侧设备
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