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WO2018227577A1 - Procédés et système d'évaluation de la qualité d'un canal radio dans un scénario de communication à faisceaux multiples - Google Patents

Procédés et système d'évaluation de la qualité d'un canal radio dans un scénario de communication à faisceaux multiples Download PDF

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Publication number
WO2018227577A1
WO2018227577A1 PCT/CN2017/088711 CN2017088711W WO2018227577A1 WO 2018227577 A1 WO2018227577 A1 WO 2018227577A1 CN 2017088711 W CN2017088711 W CN 2017088711W WO 2018227577 A1 WO2018227577 A1 WO 2018227577A1
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Prior art keywords
link
radio
radio channel
reference signal
measuring
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Ceased
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PCT/CN2017/088711
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English (en)
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Peng Hao
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ZTE Corp
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ZTE Corp
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Priority to CN201780092199.7A priority Critical patent/CN110754050B/zh
Priority to PCT/CN2017/088711 priority patent/WO2018227577A1/fr
Publication of WO2018227577A1 publication Critical patent/WO2018227577A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/088—Hybrid systems, i.e. switching and combining using beam selection

Definitions

  • the present disclosure is related generally to multi-beam wireless communication and, more particularly, to a method and system for evaluating radio channel quality in a multi-beam communication scenario.
  • the UE uses cell-specific reference signal ( “CRS” ) to measure radio channel and then evaluate downlink radio link quality (e.g. generate SINR of downlink radio link) over an evaluation period.
  • CRS is a wideband and ‘always-on’ signal, which is usually transmitted with a single beam direction.
  • the UE will use the evaluation of radio link to assess radio link quality, i.e. compare evaluation of radio link with thresholds Qout and Qin and indicate in-sync ( “IS” ) or out-of-sync ( “OOS” ) status to a higher layer.
  • the higher layer will declare radio link failure based on IS or OOS indication if a predefined condition is satisfied.
  • RRC re-establishment procedure will be triggered to recover radio link. This procedure is called radio link monitoring, with allows the system to identify those situations wherein the network cannot keep in touch with a UE through PDCCH.
  • NR new radio
  • 5G new radio
  • the beam failure recovery procedure will be much faster than overall radio link failure recovery. This is because beam failure recovery is a physical layer mechanism. While declaration of RLF is performed by RRC layer when there is a long period of problem in radio link quality, at this time UE is required to re-establish the RRC connection. In other words, RLM/RLF will resolve the problem of radio link when beam failure recovery mechanism fails or is absent (e.g., in the case of single beam operation) . However, it has been decided that a NR system will not implement a CRS-like signal.
  • FIG. 1 is a diagram of a system in which various embodiments of the disclosure are implemented.
  • FIG. 2 shows an example hardware architecture, according to an embodiment.
  • FIGS. 3-8 show how a communication node evaluates radio channel quality in a multi-beam communication scenario, according to various embodiments.
  • the present disclosure is directed to a method and system for evaluating the radio channel quality between a first communication node and a second communication node for a radio link evaluation period.
  • the disclosed method and system performs radio link monitoring by reusing reference signals that will already be in use for beam pair link monitoring.
  • Table 1 lists various abbreviations used in the present disclosure, along with their expanded forms.
  • BPL Beam Pair Link BRP Beam Recovery Procedure CRS Cell Specific Reference Signal CSI-RS Channel State Information Reference Signal CSS or C-SS Common Search Space DMRS or DM-RS Demodulation Reference Signal gNB Next Generation Node B IS In Sync LTE Long-Term Evolution NG Next Generation OOS Out of Sync PBCH Physical Broadcast Channel PDCCH Physical Downlink Control Channel PDSCH Physical Downlink Shared Channel PRACH Physical Random Access Channel PSS Primary Synchronization Signal PUCCH Physical Uplink Control Channel Q in , Q out Quality In, Quality Out RACH Random Access Channel RLF Radio Link Failure RLM Radio Link Monitoring RRC Radio Resource Control RS Reference Signal SINR Signal to Interference plus Noise Ratio
  • FIG. 1 depicts a wireless communication system 100, which includes a wireless base station 102 and a UE 104.
  • the wireless communication system 100 has many components that are not depicted in FIG. 1, including other base stations, other UEs, wireless infrastructure, wired infrastructure, and other devices commonly found in wireless networks.
  • Example implementations of the base station 102 include a gNB.
  • Example implementations of the UE include any device capable of wireless communication, such as a smartphone, tablet, laptop computer, and non-traditional devices (e.g., household appliances or other parts of the “Internet of Things” ) .
  • the base station 102 and UE 104 may sometimes be referred to herein as “communication nodes. ”
  • “communication node” encompasses both types of devices.
  • FIG. 2 illustrates a basic (computing device) hardware architecture found in both the base station 102 and the UE 104, according to an embodiment.
  • the base station 102 and the UE 104 have other components as well, some of which are common to both and others that are not.
  • the hardware architecture depicted in FIG. 2 includes logic circuitry 202, memory 204, transceiver 206, and one more antennas represented by antenna 208. Each of these elements is communicatively linked to one another via one or more data pathways 210. Examples of data pathways include wires, conductive pathways on a microchip, and wireless connections.
  • Measurements taken by a communication node may be stored in the memory 204 (e.g., in a data structure such as a table) .
  • Such measurements may include, for example, the strength of a signal (e.g., a reference signal) received from another communication node (e.g., the strength the of the RS received by a UE from a base station) , the strength of the signal the remote communication node measures from the original communication node (e.g., the strength of the UE’s signal as measured by the base station and reported back to the UE) , and BLER.
  • logic circuitry means a circuit (atype of electronic hardware) designed to perform complex functions defined in terms of mathematical logic. Examples of logic circuitry include a microprocessor, a controller, or an application-specific integrated circuit. When the present disclosure refers to a device carrying out an action, it is to be understood that this can also mean that logic circuitry integrated with the device is, in fact, carrying out the action.
  • Possible implementations of the memory 204 include: volatile data storage; nonvolatile data storage; electrical memory; magnetic memory; optical memory; random access memory ( “RAM” ) ; cache memory; and hard drives.
  • SINR-like metrics e.g., hypothetical PDCCH BLER
  • Reference signals that may possibly be used to derive such a SINR-like metric include CSI-RS, DM-RS for NR-PDCCH in C-SS, DMRS for NR-PBCH, NR-SSS, RS for time/frequency tracking (if a separate RS is defined for time/frequency tracking) .
  • Each reporting instance will indicate a single IS or OOS regardless of the number of beams available in a cell.
  • IS/OOS indications are provided periodically, and possibly aperiodically as well.
  • the physical layer performs the OOS/IS indication and the RRC declares RLF. For RLF purposes, the IS/OOS indication should be a per cell indication.
  • a beam failure event ( “beam failure” ) is deemed to have occured when the quality of beam pair link (s) of an associated control channel falls low enough (e.g., below a threshold, time- out of an associated timer) .
  • the mechanism for recovering from beam failure is triggered when beam failure occurs.
  • a UE declares RLF upon timer expiration due to DL OOS detection, random access procedure failure detection, and RLC failure detection.
  • the beam failure recovery process that a UE carries out according to various implementations can be summarized as follows: the UE identifies a beam failure, identifies a new candidate beam, transmits a request for beam failure recovery (e.g., sends the request in symbols containing RACH) , and monitors for a response to the recovery request from the base station.
  • a request for beam failure recovery e.g., sends the request in symbols containing RACH
  • a UE uses one or more of the follow signals in order to determine whether there is a beam failure and to identify new candidate beams: RS for beam management (e.g., periodic CSI-RS, if configured by the network; periodic CSI-RS and SS-blocks within the serving cell (if an SS-block is also used in beam management) ) , RS for fine timing/frequency tracking, SS blocks, DM-RS of PDCCH (including group common PDCCH and/or UE specific PDCCH) , DMRS for PDSCH.
  • RS for beam management e.g., periodic CSI-RS, if configured by the network; periodic CSI-RS and SS-blocks within the serving cell (if an SS-block is also used in beam management)
  • RS for fine timing/frequency tracking SS blocks
  • DM-RS of PDCCH including group common PDCCH and/or UE specific PDCCH
  • the beam failure recovery request sent by the UE sends includes at least one of: (1) explicit/implicit information identifying the UE and information regarding the new base station TX beam (candidate beam) , and (2) explicit/implicit information identifying the UE and whether or not a new candidate beam exists.
  • the techniques described in conjunction with FIG. 3 and FIGS. 5-8 involve a method and system for evaluating the radio channel quality between, for example, a first communication node and a second communication node for a radio link evaluation period that has at least a first portion and a second portion.
  • a communication node such as a UE
  • receive a first reference signal e.g., from a base station
  • receiving a second reference signal of a second beam link e.g.
  • the evaluating step is initiated only if an indication of availability of the second beam link is received before the end of radio link evaluation period or an indication of the availability of the second beam link is received before the time that the radio link evaluation is to be performed.
  • another embodiment involves a communication node receiving a first reference signal of a first beam link; monitoring the quality of the first beam link using the first reference signal; receiving a second reference signal of a second beam link; monitoring the quality of the second beam link using the second reference signal; using the first reference signal to evaluate the radio channel quality during the first portion of the radio link evaluation period; using the second reference signal to evaluate the radio channel quality during the second portion of the radio link evaluation period; and evaluating the radio channel quality for the radio link evaluation period based on both the evaluation of the radio channel quality for the first portion of the radio link evaluation period and the evaluation of the radio channel quality for the second portion of the radio link evaluation period.
  • the first reference signal is detected before the second reference signal and the first portion ends when the second reference signal is detected. Also, in an embodiment, the first reference signal is detected before the second reference signal, and the second portion begins when the second reference signal is detected.
  • the communication node carries out measuring a radio channel of the first beam link during a first beam monitoring period, carries out measuring a radio channel of the second beam link during a second beam monitoring period. Furthermore, the communication node determines, based on the measuring of the radio channel of the first beam link or the measuring of the radio channel of the second beam link, that the first beam link or the second beam link has failed; and sets the end of the first portion of the radio link evaluation period or the second portion of the radio link evaluation period to the start of the beam monitoring period during which the first beam link or second beam link is determined to have failed.
  • the communication node carries out measuring the radio channel of the first beam link during a first beam monitoring period. Furthermore, the communication node determines, based on the measuring of the radio channel of the first beam link, that the first beam link has failed; and sets the start of the second portion of the radio link evaluation period to the beginning of the first beam monitoring period.
  • BPL can refer to one transmit beam direction or a combination of transmit and receive beam direction. It is also assume that the radio link evaluation period can include an integer number of BMPs. In each of the following figures, RSx corresponds to BPLx.
  • the UE assesses radio link quality based on evaluation result of radio link in order to indicate IS or OOS status to higher layers. Also, the UE carries out radio link evaluation using a reference signal during the last X ms, which is referred to herein as the “radio link evaluation period. ” The radio link evaluation can be carried out, for example, by averaging the measurement results of the respective beams during the radio link evaluation period.
  • the UE has obtained the configuration of both RS0 and RS1 at or before t0, and thus the UE can measure the radio channel using both RS0 and RS1.
  • RS0 and RS1 correspond to BPL0 and BPL1 respectively.
  • the BPL0 is allocated to UE at t4, so during t4 to t0, the UE uses the measurement based on RS0 for radio link evaluation.
  • the UE monitors beam link quality using RS0 during the BMP to determine whether a BPL failure event has occurred.
  • the UE determines that a BLP0 failure has occurred (at t1 after one BMP in this example)
  • the UE will start a BRP.
  • the base station responds by allocating a new BPL at t2 (i.e., before the time of radio link quality assessing) .
  • a communication node evaluates the radio channel quality between itself and a second communication node (e.g., a base station or multiple base stations acting in concert) by carrying out the following actions during a radio link evaluation period: receiving a first reference signal of a first beam link; measuring a radio channel of the first beam link during a first portion of the radio link evaluation period using the first reference signal; and, based on the measuring of the radio channel of the first beam link, determining that the first beam link has failed prior to the end of the radio link evaluation period.
  • the communication node does not receive a second reference signal before the end of the radio link evaluation period.
  • the communication node therefore (e.g., in response to a determination that a second reference signal has not been received) uses the first reference signal to evaluate the quality of the radio link between itself and the second communication node for the radio link evaluation period.
  • the UE has obtained the configuration of RS0 at or before t0, and therefore the UE can measure the radio channel using RS0.
  • the BPL0 is allocated to UE at t4, so during t4 to t0, the measurement based on RS0 is used for radio link evaluation.
  • the UE monitors the beam link quality with RS0 during the BMP to detect a BPL failure event.
  • BLP0 failure is detected at t1 after one BMP, the UE will start a BRP.
  • UE is not able to get a new BPL indication before the time that it assesses radio link quality, so the UE uses the measurement based on RS0 during t0 to t3 to evaluate the radio link.
  • a communication node receives a third reference signal of a third beam link, measures a radio channel of the third beam link using the third reference signal during a third portion of the radio link evaluation period (or, alternatively, uses the third reference signal to evaluate the radio channel quality during the third portion of the radio link evaluation period) ; determines, based on the measuring of the radio channel (or, alternatively, on the monitored quality) of the second beam link, that the second beam link has failed; and, based on the determination that the second beam link has failed, sets the end of the second portion and the start of the third portion to the time the third reference signal is detected.
  • evaluating the radio channel quality for the radio link evaluation period includes evaluating the radio channel quality based on the measurements of the radio channel of the first, second, and third beam links (or, alternatively, the radio link evaluations for the first, second, and third portions (e.g., by averaging the evaluation results for the three periods) ) .
  • RS0 and RS1 correspond to BPL0 and BPL1 respectively.
  • the BPL0 is allocated to UE at t4, so during t4 to t0, the UE uses the measurement based on RS0 for radio link evaluation.
  • the UE monitors beam link quality with RS0 during the BMP to determine whether a BPL failure event has occurred. In this example, there are two BPL failure events.
  • the UE When the BLP0 failure is detected at t1 after one BMP, the UE will start a BRP and then the base station allocates a new BPL (i.e. BPL1) at t2 (i.e. before the time the UE assesses the radio link quality) .
  • BPL1 a new BPL
  • the UE has the measurement based on RS1 during t0 to t2, so the UE uses the measurement based on RS1 from t0 to t0’ to evaluate radio link.
  • the UE determines that BLP1 has failed. After another BMP, the UE will start another BRP.
  • the base station allocates a new BPL (i.e., BPL2) at t2’ .
  • BPL2 a new BPL
  • the UE has the measurement based on RS2 during t0’ to t2’ , so the UE uses the measurement based on RS2 from t0’to t3 to evaluate the radio link.
  • BPL2 BPL2
  • the communication node e.g., the UE
  • measures a radio channel of the first beam link during a first beam monitoring period determines, based on the measuring of the radio channel of the first beam link, that the first beam link has failed; and sets the start of the second portion of the radio link evaluation period to the end of the first beam monitoring period.
  • the UE has obtained the configuration of both RS0 and RS1 at or before t0, but UE can measure radio channel using RS0.
  • the base station allocates the BPL0 to the UE at t4, so during t4 to t0, the UE uses the measurement based on RS0 for radio link evaluation.
  • the UE monitors the beam link quality with RS0 during the BMP to determine whether a BPL failure event has occurred.
  • the UE determines that BLP0 failure occurred at t1 after one BMP, the UE will start a BRP. Furthermore, the UE will start measuring radio channel using RS1 at t1.
  • the base station allocates a new BPL (i.e., BPL1) at t2 (i.e., before the time the UE assesses radio link quality) .
  • the communication node e.g., the UE
  • the communication node determines that the first beam link has failed based on the measuring of the radio channel of the first beam link; receives a third reference signal of a third beam link; receives the first reference signal before the third reference signal; receives the third reference signal before the second reference signal; measures a radio channel of the third beam link using the third reference signal; and sets the end of the first portion of the radio link monitoring period to the start of the first beam monitoring period.
  • the second portion of the radio link monitoring period may end before or at the time that the overall radio link monitoring period ends.
  • RS2 may be considered to be the second reference signal and RS1 may be considered the third reference signal is RS1
  • RSx corresponds to BPLx.
  • the BPL0 is allocated to UE at t4, so during t4 to t0, the measurement based on RS0 is used for radio link evaluation.
  • UE monitors beam link quality with RS0 during Beam Monitoring Period (BMP) to detect beam pair link (BPL) failure event.
  • BMP Beam Monitoring Period
  • BPL beam pair link
  • UE When BLP0 failure is detected at t1 after one BMP, UE will start a BRP.
  • BRP Beam Monitoring Period
  • a new RS configuration is sent to UE at t11 and UE uses RS2 to measure radio channel at this time.
  • the communication node e.g., the UE measures a radio channel of the first beam link during a first beam monitoring period; measures a radio channel of the second beam link during a second beam monitoring period; receives an indication of the availability of the first beam link; receives an indication of the availability of the second beam link; and sets the start of the first portion of the radio link evaluation period or the second portion of the radio link evaluation period to the time that an indication of the availability of the respective first beam link or second beam link is received.
  • RS0 and RS1 correspond to BPL0 and BPL1 respectively.
  • the base station allocates BPL0 to the UE, so during t4 to t0, the UE uses the measurement based on RS0 for radio link evaluation.
  • the UE monitors beam link quality with RS0 during the BMP to determined whether a BPL failure event has occurred.
  • the UE determines that a failure of BLP0 has occured at t1 after one BMP, the UE will start a BRP. If UE does not store the measurement result of each measuring instance and performs calculation of radio link evaluation when the measurement result of one measuring instance is obtained, the UE has to use the measurement based on RS0 during t0 to 1 since the BPL0 failure is detected at t1. After BPL0 failure is detected at t1, UE will stop evaluating radio link with RS0.
  • the new BPL (i.e. BPL1) is allocated at t2 (i.e. before the time of radio link quality assessing) and UE starts using measurement based on RS1 to evaluate radio link after t2 (until the time instance within the radio link evaluation period, where BPL1 failure is detected) . This is because no measurement results of measuring instances (measurements taken by the UE) during t1 to t2 are stored.

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

Abstract

L'invention concerne un procédé et un système d'évaluation de la qualité d'un canal radio, consistant à recevoir un premier signal de référence d'une première liaison de faisceau; mesurer un canal radio de la première liaison de faisceau à l'aide du premier signal de référence pendant la première portion de la période d'évaluation de liaison radio; recevoir un deuxième signal de référence d'une deuxième liaison de faisceau; mesurer un canal radio de la deuxième liaison de faisceau à l'aide du deuxième signal de référence pendant la deuxième portion de la période d'évaluation de liaison radio; et évaluer la qualité du canal radio pour la période d'évaluation de liaison radio sur la base à la fois de la mesure du canal radio de la première liaison de faisceau et de la mesure de la qualité du canal radio de la deuxième liaison de faisceau.
PCT/CN2017/088711 2017-06-16 2017-06-16 Procédés et système d'évaluation de la qualité d'un canal radio dans un scénario de communication à faisceaux multiples Ceased WO2018227577A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201780092199.7A CN110754050B (zh) 2017-06-16 2017-06-16 在多波束通信场景中评估无线电信道质量的方法和系统
PCT/CN2017/088711 WO2018227577A1 (fr) 2017-06-16 2017-06-16 Procédés et système d'évaluation de la qualité d'un canal radio dans un scénario de communication à faisceaux multiples

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PCT/CN2017/088711 WO2018227577A1 (fr) 2017-06-16 2017-06-16 Procédés et système d'évaluation de la qualité d'un canal radio dans un scénario de communication à faisceaux multiples

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