WO2018143875A1 - Procédés de surveillance de qualité de liaison radio basée sur la formation de faisceau dans nr - Google Patents

Procédés de surveillance de qualité de liaison radio basée sur la formation de faisceau dans nr Download PDF

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Publication number
WO2018143875A1
WO2018143875A1 PCT/SE2018/050073 SE2018050073W WO2018143875A1 WO 2018143875 A1 WO2018143875 A1 WO 2018143875A1 SE 2018050073 W SE2018050073 W SE 2018050073W WO 2018143875 A1 WO2018143875 A1 WO 2018143875A1
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Prior art keywords
beams
subset
cell
rlm
rlf
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PCT/SE2018/050073
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English (en)
Inventor
Iana Siomina
Muhammad Kazmi
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Telefonaktiebolaget Lm Ericsson (Publ)
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Publication of WO2018143875A1 publication Critical patent/WO2018143875A1/fr

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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
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment

Definitions

  • the present disclosure relates to a cellular communications network that utilizes beamforming (e.g., a New Radio (NR) network) and, in particular, to beamforming based radio link quality monitoring in a cellular communications network.
  • beamforming e.g., a New Radio (NR) network
  • NR New Radio
  • NR New Radio
  • 5G Fifth Generation
  • NG Next Generation
  • eNB evolved Node B
  • LTE Long Term Evolution
  • gNB NR Base Station
  • one NR BS may correspond to one or more NR BS
  • Figure 2 illustrates deployment scenarios with NR BSs which are discussed in 3GPP.
  • Multi-antenna schemes for NR are currently being discussed in 3GPP.
  • frequency ranges up to 100 Gigahertz (GHz) are considered. It is known that high-frequency radio communication above 6 GHz suffers from significant path loss and penetration loss.
  • One solution to address this issue is to deploy large-scale antenna arrays to achieve high beamforming gain, which is a reasonable solution due to the small wavelength of high-frequency signals.
  • MIMO Multiple Input Multiple Output
  • Tx Transmit
  • Rx Receive
  • analog beamforming would compensate high path loss in NR scenarios, while digital precoding would provide additional performance gains similar to MIMO for sub-6 GHz necessary to achieve a reasonable coverage.
  • digital precoding would provide additional performance gains similar to MIMO for sub-6 GHz necessary to achieve a reasonable coverage.
  • the implementation complexity of analog beamforming is significantly less than digital precoding since it relies on simple phase shifters in many implementations, but the drawbacks are its limitation in multi-direction flexibility (i.e., a single beam can be formed at a time and the beams are then switched in time domain), only wideband transmissions (i.e., not possible to transmit over a subband), unavoidable inaccuracies in the analog domain, etc.
  • Digital beamforming (requiring costly converters to/from the digital domain from/to Intermediate Frequency (IF) domain), used today in LTE, provides the best performance in terms of data rate and multiplexing capabilities (multiple beams over multiple subbands at a time can be formed), but at the same time it is challenging in terms of power consumption, integration, and cost; in addition to that the gains do not scale linearly with the number of transmit/receive units while the cost is growing rapidly. Supporting hybrid beamforming, to benefit from cost-efficient analog beamforming and high-capacity digital beamforming, is therefore desirable for NR.
  • An example diagram for hybrid beamforming is shown in Figure 3.
  • Beamforming can be on transmission beams and/or reception beams. Further, beamforming can be on the network side or the User Equipment device (UE) side.
  • UE User Equipment device
  • the analog beam of a subarray can be steered toward a single direction on each Orthogonal Frequency Division Multiplexing (OFDM) symbol, and hence the number of subarrays determines the number of beam directions and the corresponding coverage on each OFDM symbol.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the number of beams to cover the whole serving area is typically larger than the number of subarrays, especially when the individual beam width is narrow. Therefore, to cover the whole serving area, multiple transmissions with narrow beams differently steered in the time domain are also likely to be needed.
  • the provision of multiple narrow coverage beams for this purpose has been called "beam sweeping.”
  • the beam sweeping seems to be essential to provide the basic coverage in NR.
  • multiple OFDM symbols in which differently steered beams can be transmitted through subarrays, can be assigned and periodically transmitted.
  • Figure 4A illustrates an example of transmit beam sweeping on two subarrays.
  • Figure 4B illustrates an example of transmit beam sweeping on three subarrays.
  • the term “numerology” includes, e.g., the following elements: frame duration, subframe or Transmission Time Interval (TTI) duration, slot duration, subcarrier spacing, Cyclic Prefix (CP) length, number of subcarriers per Resource Block (RB), number of RBs within the bandwidth (different
  • numerologies may result in different numbers of RBs within the same bandwidth), number of symbols within a certain time unit, e.g. 1 millisecond (ms) subframe, symbol length, etc.
  • RATs Radio Access Technologies
  • performance targets e.g., performance requirements impose constraints on usable subcarrier spacing sizes, e.g., the maximum acceptable phase noise sets the minimum subcarrier bandwidth while the slow decay of the spectrum (impacting filtering complexity and guardband sizes) favors smaller subcarrier bandwidth for a given carrier frequency, and the required CP sets the maximum subcarrier bandwidth for a given carrier frequency to keep overhead low.
  • the numerology used so far in the existing RATs is rather static and typically can be trivially derived by the UE, e.g., by one-to-one mapping to RAT, frequency band, service type (e.g., Multimedia Broadcast/Multicast Service (MBMS)), etc.
  • MBMS Multimedia Broadcast/Multicast Service
  • the subcarrier spacing is 15 kilohertz (kHz) for normal CP and 15 kHz and 7.5 kHz (i.e., the reduced carrier spacing) for extended CP, where the latter is allowed only for MBMS-dedicated carriers.
  • NR which is to be based on OFDM
  • multiple numerologies will be supported for general operation.
  • a scaling approach (based on a scaling factor 2 ⁇ ⁇ , n 6 FJ 0 ) is considered for deriving subcarrier spacing candidates for NR.
  • Values for subcarrier bandwidths currently discussed include among others 3.75 kHz, 15 kHz, 30 kHz, and 60 kHz.
  • the numerology-specific slot durations can then be determined in ms based on the subcarrier spacing: subcarrier spacing of (2 m *15) kHz gives exactly 1/2 m 0.5 ms for a slot that is 0.5 ms in the 15 kHz numerology.
  • Subcarrier spacings of at least up to 480 kHz are currently being discussed for NR (the highest discussed values correspond to millimeter-wave based technologies). It was also agreed that multiplexing different numerologies within a same NR carrier bandwidth is supported, and Frequency Domain Multiplexing (FDM) and/or Time Domain Multiplexing (TDM) can be considered. It was further agreed that multiple frequency/time portions using different numerologies share a synchronization signal, where the synchronization signal refers to the signal itself and the time-frequency resource used to transmit the synchronization signal. Yet another agreement is that the numerology used can be selected independently of the frequency band although it is assumed that a very low subcarrier spacing will not be used at very high carrier frequencies.
  • FDM Frequency Domain Multiplexing
  • TDM Time Domain Multiplexing
  • Radio Link Monitoring (RLM) and Radio Link Failure (RLF) are procedures utilized in LTE.
  • the purpose of RLM is to monitor the radio link quality of the serving cell of the UE and use that information to decide whether the UE is in In Sync (IS) or Out of Sync (OOS) with respect to that serving cell.
  • RLM is carried out by a UE performing measurement on downlink reference symbols (Cell Specific Reference Signals (CRSs)) in
  • the UE starts the RLF procedure and declares RLF after the expiry of RLF time (e.g., T310).
  • the actual procedure is carried out by comparing the estimated downlink reference symbol measurements to some target Block Error Rate (BLER), Qout and Qin.
  • BLER Block Error Rate
  • Qout and Qin correspond to the BLER of hypothetical Physical Downlink Control Channel (PDCCH) / Physical Control Format Indicator Channel (PCIFCH) transmissions from the serving cell. Examples of Qout and Qin are 10% and 2%, respectively.
  • the current RLF procedure in LTE has two phases, as depicted in Figure 6.
  • the first phase starts upon radio link problem detection and leads to RLF detection.
  • the second phase Radio Resource Control (RRC) recovery
  • RRC Radio Resource Control
  • re-establishment is triggered when the Primary Cell (PCell) experiences RLF.
  • the UE does not monitor the RLF of Secondary Cells (SCells), which are monitored by the eNB.
  • SCells Secondary Cells
  • the first phase of the RLF procedure is supported for the PCell and a Primary Secondary Cell (PSCell).
  • PSCell Primary Secondary Cell
  • Re- establishment is triggered when the PCell experiences RLF.
  • the re-establishment procedure is not triggered at the end of the first phase. Instead, the UE informs the RLF of the PSCell to a Master eNB (MeNB).
  • MeNB Master eNB
  • RLF can be triggered by layer 1 (L1 , a.k.a. physical layer or PHY) or layer 2 (L2), which is then reported to layer 3 (L3).
  • RLM is responsible for L1 - triggering, upon receiving N310 consecutive "out-of-sync", or OOS, indications from lower layers and no recovery (no "IS").
  • L2-triggering may be, e.g., upon indication from RLC that the maximum number of retransmissions have been reached or upon random access problem indication from Medium Access Control (MAC).
  • MAC Medium Access Control
  • New RLM and/or RLF procedures are needed for a NR network.
  • a method of operation of a radio node for multi-beam Radio Link Monitoring (RLM) and/or multi-beam Radio Link Failure (RLF) comprises performing quality monitoring for at least a first subset of a plurality of beams of a cell and performing one or more actions if a result of performing quality monitoring for at least the first subset of the plurality of beams of the cell indicates a radio link problem and/or a RLF problem.
  • RLM Radio Link Monitoring
  • RLF multi-beam Radio Link Failure
  • the one or more actions comprise link recovery, indicating the problem to a higher layer, indicating the problem to another node, going to an inactive state, going to an idle state, and/or triggering a timer or counter.
  • performing quality monitoring for at least the first subset of the plurality of beams of the cell comprises determining the first subset of the plurality of beams of the cell and performing quality monitoring for the first subset of the plurality of beams of the cell.
  • determining the first subset of the plurality of beams of the cell comprises determining the first subset of the plurality of beams of the cell autonomously at the radio node.
  • determining the first subset of the plurality of beams of the cell comprises determining the first subset of the plurality of beams of the cell based on information received from another node.
  • determining the first subset of the plurality of beams of the cell comprises receiving, from a network node, a configuration of at least one parameter used for RLM and/or RLF for the first subset of the plurality of beams of the cell.
  • the at least one parameter comprises the first subset of the plurality of beams of the cell.
  • determining the first subset of the plurality of beams of the cell comprises selecting a subset of the plurality of beams of the cell that meet a first quality criteria as the first subset of the plurality of beams of the cell.
  • a maximum number of beams that can be in the first subset of the plurality of beams is predefined or configured.
  • performing quality monitoring for at least the first subset of the plurality of beams of the cell further comprises determining a second subset of the plurality of beams of the cell and performing quality monitoring for the second subset of the plurality of beams of the cell.
  • determining the second subset of the plurality of beams of the cell comprises determining the second subset of the plurality of beams of the cell autonomously at the radio node.
  • determining the second subset of the plurality of beams of the cell comprises determining the second subset of the plurality of beams of the cell based on information received from another node.
  • determining the second subset of the plurality of beams of the cell comprises receiving, from a network node, a configuration of at least one parameter used for RLM and/or RLF for the second subset of the plurality of beams of the cell.
  • the at least one parameter comprises the second subset of the plurality of beams of the cell.
  • determining the second subset of the plurality of beams of the cell comprises selecting a subset of the plurality of beams of the cell that meet a second quality criteria as the second subset of the plurality of beams of the cell.
  • a maximum number of beams that can be in the second subset of the plurality of beams of the cell is predefined or configured.
  • quality monitoring for the first subset of the plurality of beams of the cell has a higher priority or higher performance target than quality monitoring for the second subset of the plurality of beams of the cell.
  • performing quality monitoring for at least the first subset of the plurality of beams of the cell comprises estimating radio link quality for at least one beam in the at least the first subset of the plurality of beams of the cell, comparing the estimated radio link quality to one or more thresholds, and providing to a higher layer an indication of a result of the comparing.
  • performing quality monitoring for at least the first subset of the plurality of beams of the cell comprises performing RLM on at least the first subset of the plurality of beams of the cell, performing RLF detection on at least the first subset of the plurality of beams of the cell, determining Out of Sync (OOS) at least once for at least the first subset of the plurality of beams of the cell, determining In Sync (IS) at least once at least the first subset of the plurality of beams of the cell, determining a single quality monitoring characteristic for multiple beams in at least the first subset of the plurality of beams of the cell, receiving downlink signals for performing RLM/RLF on at least the first subset of the plurality of beams of the cell, transmitting a specific uplink message, and/or determining a corresponding RLM and/or RLF requirement or performance target.
  • OOS Out of Sync
  • IS In Sync
  • performing quality monitoring for at least the first subset of the plurality of beams of the cell comprises performing quality monitoring for at least the first subset of the plurality of beams of the cell over an evaluation or monitoring period, wherein the evaluation or monitoring period is a function of any combination of: a number of beams in the subset, a number of subsets of beams for quality monitoring, a characteristic associated with the subset, carrier frequency of the cell, numerology used for the cell, a cell type of the cell, a beam type of beams included in the subset, a priority of the beams in the subset, a speed of the radio node, a radio node type of the radio node, a measured signal type for the beams in the subset, and/or an approach used for radio link problem or failure reporting or indication used for the beams in the subset.
  • performing quality monitoring for at least the first subset of the plurality of beams of the cell comprises separately evaluating OOS and IS for two or more beams in at least the first subset of the plurality of beams of the cell.
  • performing quality monitoring for at least the first subset of the plurality of beams of the cell comprises jointly evaluating OOS and IS for two or more beams in at least the first subset of the plurality of beams of the cell.
  • performing quality monitoring for at least the first subset of the plurality of beams of the cell further comprises meeting one or more requirements related to performing quality monitoring for at least the first subset of the plurality of beams of the cell.
  • performing quality monitoring for at least the first subset of the plurality of beams of the cell comprises performing quality monitoring for two or more subsets of the plurality of beams of the cell, the two or more subsets comprising the first subset, and determining a change in at least one of the two or more subsets of the plurality of beams of the cell.
  • performing quality monitoring for at least the first subset of the plurality of beams of the cell further comprises adapting one or more
  • the method further comprises indicating, to another node, an ability of the radio node associated with multi-beam RLM and/or multi-beam RLF.
  • Embodiments of a radio node are also disclosed. In some embodiments,
  • a radio node for multi-beam RLM and/or RLF is adapted to perform quality monitoring for at least a first subset of a plurality of beams of a cell and perform one or more actions if a result of performing quality monitoring for at least the first subset of the plurality of beams of the cell indicates a radio link problem and/or a RLF problem.
  • a radio node for multi-beam RLM and/or RLF comprises at least one transmitter, at least one receiver, and at least one processor adapted to cause the radio node to perform quality monitoring for at least a first subset of a plurality of beams of a cell and perform one or more actions if a result of performing quality monitoring for at least the first subset of the plurality of beams of the cell indicates a radio link problem and/or a RLF problem.
  • a method of operation of a network node related to multi-beam RLM and/or multi-beam RLF comprises controlling RLM and/or RLF procedures performed by a radio node, wherein controlling RLM and/or RLF procedures performed by the radio node comprises configuring at least one parameter in the radio node used for RLM and/or RLF procedures for a first subset of a plurality of beams of a cell.
  • the method further comprises obtaining a result of controlling RLM and/or RLF procedures performed by the radio node.
  • the at least one parameter comprises the first subset of the plurality of beams of the cell. In some embodiments, the at least one parameter comprises information to be used by the radio node to select the first subset of the plurality of beams of the cell. In some embodiments, the at least one parameter comprises an indication to configure the radio node to apply independent RLM procedures to beams in the first subset of the plurality of beams of the cell, an indication to configure the radio node to apply a composite RLM procedure to beams in the first subset of the plurality of beams of the cell, or information to be used by the radio node to select between applying
  • controlling RLM and/or RLF procedures performed by the radio node based on the indication further comprises
  • the at least one parameter comprises the first subset of beams associated with the cell and the second subset of beams associated with the cell.
  • the method further comprises using the result for one or more operational tasks.
  • the one or more operational tasks comprises mobility, beam change, beam set change, subset change, cell change, cell set change, Minimization of Drive Tests (MDT), Self- Organizing Network (SON), Radio Resource Management (RRM), link adaptation optimization, and/or antenna/beam configuration optimization.
  • the method further comprises sending the result to another node.
  • a network node for a wireless system that enables multi-beam RLM and/or RLF is adapted to control RLM and/or RLF procedures performed by a radio node, wherein controlling RLM and/or RLF procedures performed by the radio node comprises configuring at least one parameter in the radio node used for RLM and/or RLF procedures for a first subset of a plurality of beams of a cell.
  • the network node is further adapted to obtain a result of controlling RLM and/or RLF procedures performed by the radio node.
  • a network node for a wireless system that enables multi-beam RLM and/or RLF comprises at least one transmitter and/or a network interface, and at least one processor adapted to cause the network node to control RLM and/or RLF procedures performed by a radio node, wherein controlling RLM and/or RLF procedures performed by the radio node comprises configuring at least one parameter in the radio node used for RLM and/or RLF procedures for a first subset of a plurality of beams of a cell.
  • a method of operation of a network node related to multi-beam RLM and/or multi-beam RLF comprises obtaining an indication of an ability of a radio node associated with multi-beam RLM and/or multi-beam RLF and controlling RLM and/or RLF procedures performed by the radio node based on the indication.
  • controlling RLM and/or RLF procedures performed by the radio node based on the indication comprises configuring at least one parameter in the radio node used for RLM and/or RLF procedures for a first subset of a plurality of beams of a cell.
  • the at least one parameter comprises the first subset of the plurality of beams of the cell.
  • the at least one parameter comprises information to be used by the radio node to select the first subset of the plurality of beams of the cell.
  • the at least one parameter comprises an indication to configure the radio node to apply independent RLM procedures to beams in the first subset of the plurality of beams of the cell, an indication to configure the radio node to apply a composite RLM procedure to beams in the first subset of the plurality of beams of the cell, or information to be used by the radio node to select between applying independent RLM procedures and applying a composite RLM procedure for beams in the first subset of the plurality of beams of the cell.
  • controlling RLM and/or RLF procedures performed by the radio node based on the indication further comprises configuring at least one parameter in the radio node used for RLM and/or RLF procedures for a second subset of the plurality of beams of the cell.
  • the at least one parameter comprises the first subset of the plurality of beams of the cell and the second subset of the plurality of beams of the cell.
  • the method further comprises obtaining a result of controlling RLM and/or RLF procedures performed by the radio node.
  • the method further comprises using the result for one or more operational tasks and/or sending the result to another node.
  • a network node for a wireless system that enables multi-beam RLM and/or RLF is adapted to obtain an indication of an ability of a radio node associated with multi-beam RLM and/or multi-beam RLF and control RLM and/or RLF procedures performed by the radio node based on the indication.
  • a network node for a wireless system that enables multi-beam RLM and/or RLF comprises at least one transmitter and/or a network interface, and at least one processor adapted to cause the network node to obtain an indication of an ability of a radio node associated with multi-beam RLM and/or multi-beam RLF and control RLM and/or RLF procedures performed by the radio node based on the indication.
  • Figure 1 illustrates an example architecture for a Third Generation
  • Figure 2 illustrates example deployments of a NR network
  • Figure 3 illustrates one example of hybrid beamforming
  • Figures 4A and 4B illustrates examples of transmit beam sweeping
  • Figure 5 illustrates examples of candidate carrier spacings
  • FIG. 6 illustrates the current Radio Link Failure (RLF) procedure in
  • LTE Long Term Evolution
  • Figure 7 illustrates one example of a wireless system (e.g., a cellular communications network such as, e.g., a 3GPP Fifth Generation (5G) or NR network), in which embodiments of the present disclosure may be implemented;
  • Figure 8 is a flow chart that illustrates methods of operation of a radio node according to some embodiments of the present disclosure;
  • Figure 9 is a flow chart that illustrates methods of operation of a network node according to some embodiments of the present disclosure.
  • Figure 10 is a flow chart that illustrates methods of operation of a network node according to some other embodiments of the present disclosure
  • Figures 1 1 and 12 are example embodiments of a wireless device.
  • Figures 13 through 15 are example embodiments of a network node. Detailed Description
  • a non-limiting term "User Equipment device (UE)" is used.
  • the UE herein can be any type of wireless device capable of communicating with a network node or another UE over radio signals.
  • the UE may also be a radio communication device, a target device, a Device-to-Device (D2D) UE, a machine type UE or a UE capable of Machine-to-Machine (M2M) communication, a sensor equipped with a UE, an iPad, a tablet, mobile terminals, a smart phone, Laptop Embedded Equipment (LEE), Laptop
  • D2D Device-to-Device
  • M2M Machine-to-Machine
  • LME Mounted Equipment
  • USB Universal Serial Bus
  • CPE Customer Premises Equipment
  • network node can be any kind of network node which may comprise of a radio network node such as a Base Station (BS), a radio BS, a base transceiver station, a BS Controller (BSC), a network controller, a New Radio (NR) BS (gNB), a NR BS, an evolved Node B (eNB), a Node B, a Multi-Cell/Multicast Coordination Entity (MCE), a relay node, an access point, a radio access point, a Remote Radio Unit (RRU) Remote Radio Head (RRH), a multi-standard BS (a.k.a.
  • MSR Multi-Standard Radio
  • a core network node e.g., a Mobility Management Entity (MME), a Self-Organizing Network (SON) node, a coordinating node, a positioning node, a Minimization of Drive Tests (MDT) node, etc.
  • MME Mobility Management Entity
  • SON Self-Organizing Network
  • MDT Minimization of Drive Tests
  • the network node may also comprise test equipment.
  • radio node used herein may be used to denote a UE or a radio network node.
  • CA Carrier Aggregation
  • the embodiments are applicable to single carrier as well as to multicarrier or Carrier Aggregation (CA) operation of the UE in which the UE is able to receive and/or transmit data to more than one serving cells.
  • CA is also called (e.g., interchangeably called) "multi-carrier system,” “multi-cell operation,” “multi-carrier operation,” “multi-carrier” transmission and/or reception.
  • CCs Component Carriers
  • PCC Primary CC
  • SCCs Secondary CCs
  • the serving cell is interchangeably called a Primary Cell (PCell) or Primary Serving Cell (PSC).
  • PCell Primary Cell
  • PSC Primary Serving Cell
  • SCell Secondary Cell
  • SSC Secondary Serving Cell
  • the term "signaling" used herein may comprise any of: high-layer signaling (e.g., via Radio Resource Control (RRC) or the like), lower-layer signaling (e.g., via a physical control channel or a broadcast channel), or a combination thereof.
  • RRC Radio Resource Control
  • the signaling may be implicit or explicit.
  • the signaling may further be unicast, multicast, or broadcast.
  • the signaling may also be directly to another node or via a third node.
  • time resource used herein may correspond to any type of physical resource or radio resource expressed in terms of length of time. Examples of time resources are: symbol, time slot, subframe, radio frame, Transmission Time Interval (TTI), interleaving time, etc.
  • TTI Transmission Time Interval
  • Radio measurements can be absolute or relative. Radio measurements can be, e.g., intra-frequency, inter-frequency, CA, etc. Radio measurements can be unidirectional (e.g., downlink or uplink) or bidirectional (e.g., Round Trip Time (RTT), Receive-Transmit (Rx-Tx), etc.).
  • RTT Round Trip Time
  • Rx-Tx Receive-Transmit
  • radio measurements e.g., Time of Arrival (TOA), timing advance, RTT, Reference Signal Time Difference (RSTD), System Frame Number (SFN) and Subframe Timing Difference (SSTD), Rx-Tx, propagation delay, etc.
  • TOA Time of Arrival
  • RTT Reference Signal Time Difference
  • SFN System Frame Number
  • SSTD Subframe Timing Difference
  • Rx-Tx propagation delay, etc.
  • angle measurements e.g., angle of arrival
  • power- based measurements e.g., received signal power, Reference Signal Received Power (RSRP), received signal quality, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR), interference power, total interference plus noise, Received Signal
  • RSSI Strength Indicator
  • CQI Channel Quality Indicator
  • CSI Channel State Information
  • PMI Precoding Matrix Indicator
  • RLM Radio Link Monitoring
  • the measurement used herein refers to any of the above radio measurements performed by a radio node on at least radio signals, which are transmitted by another radio node using at least one beam.
  • the transmitted beam may be created by at least two transmit antennas or antenna elements.
  • beamformed measurement is also interchangeably called a 'measurement with beamforming,' a measurement on one or more beams, a beam measurement, etc.
  • the term beamformed measurement may further comprise performing the measurement using beamformed reception, i.e., using at least one reception beam.
  • the beamformed measurement performed without measurement on the reception beam is denoted by Nb1.
  • the beamformed measurement performed with reception beam is denoted by Nb2.
  • For consistency beamformed measurement is denoted by a generic term 'Nb' and it can be Nb1 or Nb2.
  • non-beamformed measurement refers to any of the above radio measurements performed by a radio node on at least radio signals, which are transmitted by another radio node without any beam.
  • the radio signal may be transmitted from the other radio node by using one or more transmit antennas.
  • the radio signals are transmitted in the entire cell or at least in the part of the signal, e.g., in the sector.
  • the non-beamformed measurement is also interchangeably called a 'measurement without beamforming,' a measurement on omnidirectional signals or signals transmitted from omnidirectional or sectorized but not beamforming antennas, an omnidirectional measurement, sector measurement, etc.
  • the term non-beamformed measurement may further comprise performing the
  • non-beamformed measurement i.e., without using any reception beam.
  • the non-beamformed measurement performed without reception beam is denoted by Nn1.
  • the term non-beamformed measurement may further comprise performing the measurement using beamformed reception, i.e., using at least one reception beam.
  • the non-beamformed measurement performed with reception beam is denoted by Nn2.
  • measurement performance used herein may refer to any criteria or metric which characterizes the performance of the measurement performed by a radio node.
  • the term measurement performance is also called measurement requirement, measurement performance requirements, etc.
  • the radio node has to meet one or more measurement performance criteria related to the performed measurement. Examples of measurement performance criteria are measurement time, number of cells to be measured with the measurement time, measurement reporting delay, measurement accuracy, measurement accuracy with regard to a reference value (e.g., ideal measurement result), etc. Examples of measurement time are measurement period, cell identification period, evaluation period, etc.
  • the term dynamic (e.g., in time) antenna configuration may comprise:
  • the dynamic antenna configuration relates to beamforming and may comprise beam switching or beam sweeping in the time domain (which may be used interchangeably herein in some embodiments).
  • the dynamic antenna configuration may be at the first radio node side or at the second and/or third radio nodes sides.
  • the dynamic configuration may apply to receive antennas and/or
  • the term "numerology" used herein may refer, e.g., to any one or more of: subcarrier spacing, number of subcarriers per Resource Block (RB), Cyclic Prefix (CP) length, number of RBs within the bandwidth, subframe length, etc.
  • the numerology may be configured statically or change dynamically for transmissions from the same Transmission Point (TP) or cell and may or may not be the same for different cells and/or carrier frequencies.
  • subset of beams used herein may refer to a subset of beams or beam pairs which is smaller than the set of all beams or beam pairs associated with the cell.
  • a beam or beam pair may comprise any one or more of a combination of any of: a downlink transmission beam, an uplink transmission beam, a downlink reception beam, and an uplink reception beam.
  • a beam may result from beamforming, beam sweeping, etc. See, e.g., the Background section above for example multi-antenna techniques in NR.
  • RLM and/or RLF may be performed on signal type(s) configured by the network.
  • RLM and/or RLF may be performed on signal type(s) selected by the radio node.
  • RLM and/or RLF may be performed on radio signals which are not specific for RLM and/or RLF but may also be used for other purposes (e.g., Radio Resource Management (RRM), mobility, positioning, etc.).
  • RLM and/or RLF may be performed on beam-specific signals.
  • Beamforming in a cellular communications network such as a NR network presents new challenges.
  • the RLM and RLF procedures as defined and utilized in a Long Term Evolution (LTE) network are less than ideal for a NR network.
  • LTE Long Term Evolution
  • at least the following problems may be envisioned.
  • the current RLM procedure and RLF indication in LTE is at the cell level and does not take into account extensive beamforming, including beam sweeping, which is specific for NR.
  • reusing cell-level RLM/RLF procedures for a single beam (serving beam) RLM/RLF is more straightforward but not optimal, given that a single beam quality may vary a lot and change very frequently back and forth, especially in high frequency bands.
  • procedures for the set of all beams associated with the serving cell is also not realistic for NR, due to the large number of beams and an even larger number of possible beam pairs (e.g., BS transmit beam and UE receive beam comprising a beam pair for a radio link).
  • FIG. 7 illustrates one example of a wireless system 10 (e.g., a cellular communications network such as, e.g., a NR network), in which embodiments of the present disclosure may be implemented.
  • a wireless system 10 e.g., a cellular communications network such as, e.g., a NR network
  • a number of wireless devices 12 e.g., UEs
  • wireless access nodes 14 e.g., gNBs
  • the radio access nodes 14 are connected to a core network 18.
  • FIG. 8 is a flow chart that illustrates methods in a radio node (e.g., the wireless device 12 which is also sometimes referred to as a UE or the radio access node 14) according to some embodiments of the present disclosure. As illustrated, the methods in a radio node comprise the steps of:
  • Step 100 Indicating to another node the radio node's ability associated with multi-beam RLM and/or RLF.
  • Step 102 Performing quality monitoring for at least a first subset of beams of a cell.
  • Step 102A Determining a first subset of beams associated with the cell.
  • Step 102B Performing quality monitoring of the first subset of beams.
  • Step 102C (in some but not necessarily all embodiments):
  • Step 102D Determining a second subset of beams associated with the cell.
  • Performing quality monitoring may further comprise performing quality monitoring of the second subset of beams.
  • Step 102E (in some but not necessarily all embodiments):
  • Performing quality monitoring may further comprise meeting one or more predefined requirements.
  • the UE determines a relevant requirement.
  • Step 102F (in some but not necessarily all embodiments):
  • Step 102G Determining a change in at least one of the beam subsets of a cell.
  • Step 104 If a result of quality monitoring indicates a radio link problem and/or RLF problem, perform one or more of:
  • Step 100 the radio node may indicate to another node the radio node's ability associated with multi-beam RLM and/or RLF.
  • another node examples include: a radio network node, a core network node, another UE, etc.
  • the capability may be sent upon a request from the other node or in an unsolicited way, e.g., upon a triggering condition or event.
  • the capability may comprise, e.g., one or more of:
  • RLM and/or RLF in a cell e.g., a maximum number, a minimum number, etc.
  • a parameter associated the first set of beams e.g., signal quality or a signal threshold, number of beams in the first set, etc.
  • ⁇ a parameter associated with the second set of beams e.g., signal quality or a signal threshold, number of beams in the second set, etc.
  • Step 102 the radio node may perform quality monitoring for at least a first subset of beams of a cell.
  • the first subset of beams comprises at least two beams.
  • the cell may be a serving cell. Examples of serving cells are PCell, Primary Secondary Cell (PSCell), NR PSCell when the PCell is a LTE PCell, etc.
  • serving cells are PCell, Primary Secondary Cell (PSCell), NR PSCell when the PCell is a LTE PCell, etc.
  • the step may further comprise determining the first subset of beams associated with the cell.
  • the determining may be autonomous in the radio node or may be based on a message or configuration or a list of identities received from another node.
  • the determining may also comprise selecting beams meeting a first quality criterion, e.g., signal quality or a first signal threshold. Examples of signal quality are SNR, SINR, RSRQ, Es/loT, etc.
  • the number or the maximum number of beams in the first subset may be predefined or configurable.
  • the determining may also comprise determining which signals to measure and how to measure, e.g., determining signal type or signal parameters to use, determining the radio node's transmitter or receiver antenna/beam configuration to use, antenna/beam configuration used at the node transmitting the signals received by the radio node, etc.
  • the step may further comprise determining a second subset of beams associated with the cell.
  • the second subset of beams comprises at least two beams.
  • the determining may be autonomous in the radio node or may be based on a message or configuration or a list of identities received from another node.
  • the determining may also comprise selecting beams meeting a second quality criterion, e.g., signal quality or a second signal threshold.
  • the number or the maximum number of beams in the second subset may be predefined or configurable. Note that, in some embodiments, only one subset of beams is determined (i.e., only the first subset of beams is determined).
  • more than one subset of beams is determined (e.g., the second subset of beams is determined in addition to the first subset of beams).
  • the two or more subsets have distinct beams; however, in some embodiments, the two or more subsets may overlap.
  • the subsets of beams differ, e.g., in terms of configuration parameters, e.g. each set has its own parameters like OOS/S thresholds, evaluation period, etc. Different subsets of beams can be monitored over overlapping or disjoint time periods.
  • the different subsets of beams may also have different priorities, e.g. the first subset is higher priority and may be evaluated faster, e.g., over a shorter period.
  • the first subset may be a primary subset of beams.
  • the second subset may be a secondary subset of beams.
  • quality monitoring of primary beams may have a higher priority and/or higher performance target.
  • the step may further comprise performing quality monitoring of the second subset of beams.
  • the quality monitoring may be performed for the first set of beams and the second set of beams separately, e.g., as different processes.
  • a quality monitoring result may comprise a first result of the quality monitoring of the first set and a second result of the quality monitoring of the second set.
  • a quality monitoring result may comprise a single result of the quality monitoring of the first set and the second set.
  • the quality monitoring of the first and second subsets of beams may be performed in parallel or during the same or overlapping time periods.
  • Performing quality monitoring for a subset (the first and/or second) of beams may further comprise, e.g., one or more of the below for each of the beams in the subset or for all of the beams in the subset:
  • OOS Out of Sync
  • IS In Sync
  • RA Random Access
  • the requirements can be predefined and are to be met by the radio node. Some examples are as follows:
  • the T1 period is also called an OOS evaluation period.
  • the first threshold may be defined as the level at which the downlink radio link cannot be reliably received and corresponds to X1 % (e.g., 10%) Block Error Rate (BLER) for one or more channels (e.g., of a hypothetical Physical Downlink Control Channel (PDCCH) transmission taking into account the Physical Control Format Indicator Channel (PCFICH) errors with predefined transmission parameters).
  • BLER Block Error Rate
  • channels e.g., of a hypothetical Physical Downlink Control Channel (PDCCH) transmission taking into account the Physical Control Format Indicator Channel (PCFICH) errors with predefined transmission parameters.
  • PDCCH Physical Downlink Control Channel
  • PCFICH Physical Control Format Indicator Channel
  • the T2 period is also called an IS evaluation period.
  • the second threshold may be defined as the level at which the downlink radio link quality can be more reliably received and shall correspond to X2% (e.g., 2%) BLER of one or more channels (e.g., of a hypothetical PDCCH transmission taking into account the PCFICH errors with transmission parameters).
  • the worst or the average quality, SNR, SINR, BLER, etc. may be evaluated or determined.
  • the requirements parameters may depend, e.g., on numerology (e.g., longer T1 for a first numerology and shorter T1 for a second numerology), number of beams (e.g., longer with more beams or if the number of beams is above a threshold), type of beamforming (e.g., digital or hybrid) or whether beam sweeping is used, carrier frequency or frequency band (e.g., longer T1 for frequency f1 and shorter T1 for frequency f2), whether RLF is performed for each beam in a subset or there is combined RLF for a subset of beams, etc.
  • numerology e.g., longer T1 for a first numerology and shorter T1 for a second numerology
  • number of beams e.g., longer with more beams or if the number of beams is above a threshold
  • type of beamforming e.g., digital or hybrid
  • carrier frequency or frequency band e.g., longer T1 for frequency f1 and shorter T1 for frequency f
  • the requirements parameters may also depend on how the UE determines the subset of beams, e.g., selects/determines by itself or based on network indication.
  • the requirements parameters may also depend on the radio node's capability associated with multi-beam RLM and/or RLF (e.g., maximum number of beams for RLM and/or RLF). o In some embodiments, the requirements parameters may also account for beam recovery (e.g., the monitoring time may be extended if the radio node attempts to perform beam link recovery prior to reporting a radio link problem to higher layers).
  • the quality monitoring may further be performed over a certain evaluation or monitoring period.
  • the evaluation period may be predefined or configurable by another node.
  • the evaluation period may depend, e.g., on one or more of:
  • ⁇ Carrier frequency may be higher than the second signal threshold and the evaluation of the first subset may therefore be faster or for a larger number of beams compared to that for the second subset).
  • the type of serving cell e.g., different evaluation periods and/or error rates are used for quality monitoring on PCell and PSCell.
  • the type of beams e.g., different evaluation periods and/or error rates are used for serving and non-serving beams, different evaluation periods for primary beams and secondary beams, etc.
  • Priority e.g., different evaluation periods and/or error rates are used for higher-priority beams.
  • the priority may be determined by the radio node and/or by a network node.
  • the priority may be determined, e.g., based on a predefined rule or a standard and/or based on a message from another node.
  • UE speed e.g., different evaluation periods and/or error rates may be required for different UE speeds.
  • UE types e.g., different evaluation periods and/or error rates may be used for different UE types (e.g., longer for lower-complexity UEs).
  • Radio link problem/failure reporting or indication approach e.g., whether RLF is performed for each beam in a subset or there is combined RLF for a subset of beams.
  • the quality monitoring can be done by estimating signal quality (e.g., SNR, SINR, RSRQ, etc.) of certain reference signal (e.g., beam specific reference signals) transmitted by beams in the subset of beams.
  • the estimated signal quality estimated over an OOS evaluation period is compared with an OOS threshold to determine whether the OOS is detected or not.
  • the estimated signal quality estimated over an IS evaluation period is compared with an IS threshold to determine whether the OOS is detected or not.
  • the OOS and IS correspond to hypothetical error rate (e.g., BLER) of a downlink control channel, e.g., downlink physical control channel.
  • Examples of reference signals are Demodulation Reference Signal (DMRS), common Reference Signal (RS), Mobility Reference Signal (MRS), etc.
  • OOS and IS are independently evaluated by the UE for each beam within the subset of the beams.
  • each beam can also independently declare RLF.
  • RLM procedure or per beam RLM procedure herein.
  • the UE may continue operation until the time at least one beam has not declared RLF. For example, in case of two beams:
  • the estimated quality on one beam may lead to OOS detection while the estimated quality on the other beam may lead to IS detection
  • the estimated quality on one beam may lead to OOS detection while the estimated quality on the other beam may also lead to OOS detection,
  • the estimated quality on one beam may lead to IS detection while the estimated quality on the other beam may also lead to IS detection.
  • OOS and IS are jointly evaluated by the UE for two or more beams within the subset of the beams.
  • all beams or at least K beams within the subset are used for jointly evaluating the RLM, i.e., OOS and IS.
  • This is also called herein a joint or composite beam RLM
  • the overall or composite estimated signal quality of the subset of beams i estimated based on the estimated signal quality (or their samples) of both beams.
  • the composite quality is determined by a function (Q T ) of the signal quality of two or more beams. Examples of function are average, maximum, minimum, median, xth percentile, worst, best, etc.
  • Q T can be expressed by Equation (1):
  • Q1 , Q2, Qn are estimated signal qualities of a first beam, a second beam, and an n th beam in the subset of the beams.
  • the composite estimated signal quality becomes worse than the OOS threshold (i.e., Qout)
  • the OOS is detected by the UE.
  • the composite estimated signal quality becomes better than the IS threshold (i.e., Qin)
  • the IS is detected by the UE.
  • M number of consecutive composite OOSs are detected by the UE then the UE starts the RLF timer. Upon the expiry of the timer the UE declares the RLF and takes actions, e.g., turn off the UE
  • the UE can be configured to perform a per beam RLM procedure (i.e., independent beam RLM) or a composite beam RLM procedure based on one or more of the following mechanisms:
  • An independent beam RLM procedure is performed in case the number of beams are below a certain threshold, while a composite beam RLM procedure is performed if the number of beams are equal to or larger than the threshold.
  • An independent beam RLM procedure is performed in case radio conditions of different beams are different, while a composite beam RLM procedure is performed if radio conditions of different beams are similar (e.g., within a certain range). Examples of radio conditions are shadow fading, multipath delay profile, etc.
  • An independent beam RLM procedure is performed in case UE speed is above a certain speed threshold, while a composite beam RLM procedure is performed if the UE speed is equal to or larger than the speed threshold,
  • Whether to apply an independent beam RLM procedure or apply a composite beam RLM procedure is based on signal level at the UE.
  • signal level examples are signal quality, signal strength, etc.
  • the independent beam RLM procedure is applied if the signal level at the UE is below the signal threshold. But the composite beam RLM procedure is performed if the signal level at the UE speed is equal to or larger than the signal threshold, o If two subsets of beams are configured then for one of the subsets of beams the UE uses an independent beam RLM procedure, while for the other subset of beams the UE uses a composite beam RLM procedure.
  • the thresholds can be predefined, configured by the network node, or autonomously determined by the UE.
  • N1 1 such as the serving or the strongest beam
  • the combined procedure is used for the other beams in the subset.
  • the radio node may further determine a change in at least one of the beam subsets of a cell (e.g., the first and/or second beam subsets).
  • the radio node may identify a new beam and add it to the subset of beams to monitor.
  • the radio node may receive a message from another node (e.g., network node) indicating the change or (re)configuring the subset of beams.
  • the radio node may adapt the relevant RLM and/or RLF requirement, based on the determined change, and perform RLM and/or RLF accordingly.
  • the required time delta for the procedure may be extended upon any change in the monitored subset of beams.
  • the requirement time for the procedure may be adapted to the number of beams to monitor.
  • Step 104 In this step, if a result of quality monitoring indicates a radio link problem and/or RLF problem, the radio node performs one or more of:
  • INACTIVE state the state when the UE is not active like in
  • the UE context may be known to the network and/or the UE location may be known to the network at least at a cell level unlike for RRC IDLE when the UE location is known to the network at the tracking area level typically comprising multiple cells)
  • the result of quality monitoring may indicate a problem when, e.g., one or more apply:
  • the link quality for the corresponding subset of beams is consistently poor, e.g., below a threshold, e.g., for at least M beams (M does not exceed the size of the subset), for the serving beam(s), for the primary beam(s), for the best M beams, etc.
  • the number of consecutive indications (e.g., IS) is below a threshold during a certain time or while a timer is running
  • N may be predefined or configured; N may be the size of a subset of beams, etc.
  • Figure 9 is a flow chart that illustrates methods in a network node according to some embodiments of the present disclosure. As illustrated, the methods in a network node comprise the steps of:
  • Step 200 Obtaining an indication of the radio node's ability associated with multi-beam RLM and/or RLF
  • Step 200A (not illustrated): Obtaining may further comprise receiving from a radio node or another node
  • Step 202 Controlling RLM and/or RLF procedures performed by the radio node, based on the received indication o Step 202A: The controlling may further comprise configuring at least one parameter in the radio node used for RLM and/or RLF for a first subset of beams associated with a cell o Step 202B (in some but not all embodiments): The controlling may further comprise configuring at least one parameter in the radio node used for RLM and/or RLF for a second subset of beams associated with the cell
  • Step 204 (in some but not all embodiments): Obtaining a result of the controlling
  • Step 206 (in some but not all embodiments): Using the result for one or more operational tasks and/or sending the result to another node
  • the network node may be a radio network node, a gNB, a radio network controller, a core network node, etc.
  • Step 200 the network node may obtain an indication of the radio node's ability associated with multi-beam RLM and/or RLF.
  • the obtaining may further comprise receiving the indication from the radio node (e.g., as described above) or another node.
  • the obtaining may be based, e.g., on UE or network measurements.
  • Step 202 the network node may control RLM and/or RLF procedures performed by the radio node, based on the received indication.
  • the controlling may further comprise configuring at least one parameter in the radio node used for RLM and/or RLF for a first subset of beams associated with a cell (step 202A).
  • the controlling may further comprise configuring at least one parameter in the radio node used for RLM and/or RLF for a second subset of beams associated with the cell (step 202B).
  • Example parameters include:
  • a criterion or parameter or signal threshold to be used for selecting the first subset of beams
  • a criterion or parameter or signal threshold to be used for selecting the second subset of beams
  • Step 204 the network node may obtain a result of the controlling.
  • the obtaining may comprise receiving from the radio node or another node.
  • the obtaining may comprise deriving based on observing the radio node's operation.
  • the result may also comprise a result of the controlled RLM and/or RLF procedures and/or an indication that the controlling has been applied in the radio node.
  • Step 206 the network node may use the obtained result for one or more operational tasks and/or sending the result to another node (e.g., another network node, another radio network node, a master BS, an LTE BS while the network node is NR network node, etc.).
  • the sending may be via a direct interface or via intermediate nodes/interfaces.
  • operational tasks include:
  • Mobility e.g., handover
  • Beam or beam subset change e.g., primary or active beam change or serving beam change
  • ⁇ Cell or cell set change e.g., primary or active cell change or serving cell change
  • Figure 10 illustrates methods in a network node according to some other embodiments of the present disclosure. As illustrated, the methods in a network node comprise the steps of:
  • Step 300 (in some but not necessarily all embodiments): Obtaining an indication of the radio node's ability associated with multi-beam RLM and/or RLF
  • Step 300A (not illustrated): Obtaining may further comprise receiving from a radio node or another node
  • Step 302 Controlling RLM and/or RLF procedures performed by the radio node, comprising configuring at least one parameter in the radio node used for RLM and/or RLF for at least a first subset of beams associated with a cell
  • Step 302A (in some but not all embodiments):
  • the controlling may further comprise configuring at least one parameter in the radio node used for RLM and/or RLF for a second subset of beams associated with the cell
  • Step 304 Obtaining a result of the controlling
  • Step 306 Using the result for one or more operational tasks and/or sending the result to another node
  • the network node may be a radio network node, a gNB, a radio network controller, a core network node, etc.
  • Step 300 the network node may obtain an indication of the radio node's ability associated with multi-beam RLM and/or RLF.
  • the obtaining may further comprise receiving from the radio node, as described above, or another node.
  • the obtaining may be based, e.g., on UE or network measurements.
  • Step 302 the network node may control RLM and/or RLF procedures performed by the radio node, which may comprise configuring at least one parameter in the radio node used for RLM and/or RLF for at least a first subset of beams associated with a cell.
  • the controlling may further comprise configuring at least one parameter in the radio node used for RLM and/or RLF for a second subset of beams associated with the cell (step 302A).
  • Example parameters may be as described above with respect to the corresponding step of Figure 8.
  • Step 304 In this step, the network node may obtain a result of the controlling.
  • the step can be as described above with respect to the
  • Step 306 In this step, the network node may use the obtained result for one or more operational tasks and/or sending the result to another node.
  • the step can be as described above with respect to the corresponding step of Figure 8.
  • FIG. 1 is a schematic block diagram of the wireless device 12 (e.g., UE) according to some embodiments of the present disclosure.
  • the wireless device 12 includes circuitry 20 comprising one or more processors 22 (e.g., Central Processing Units (CPUs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), Digital Signal Processors (DSPs), and/or the like) and memory 24.
  • the wireless device 12 also includes one or more transceivers 26 each including one or more
  • the functionality of the wireless device 12 described above may be implemented in hardware (e.g., via hardware within the circuitry 20 and/or within the processor(s) 22) or be implemented in a combination of hardware and software (e.g., fully or partially implemented in software that is, e.g., stored in the memory 24 and executed by the processor(s) 22).
  • a computer program including instructions which, when executed by the at least one processor 22, causes the at least one processor 22 to carry out at least some of the functionality of the wireless device 12 according to any of the embodiments described herein is provided.
  • a carrier containing the aforementioned computer program product is provided.
  • the carrier is one of an electronic signal, an optical signal, a radio signal, or a computer readable storage medium (e.g., a non-transitory computer readable medium such as memory).
  • Figure 12 is a schematic block diagram of the wireless device 12 (e.g., UE) according to some other embodiments of the present disclosure.
  • the wireless device 12 includes one or more modules 34, each of which is
  • the module(s) 34 provide the functionality of the wireless device 12 described herein.
  • the modules(s) 34 may include an indicating module (optional) operable to perform the function of step 100 of Figure 8, a first performing module operable to perform the function of step 102 of Figure 8, and a second performing module operable to perform the function of step 104 of Figure 8.
  • FIG. 13 is a schematic block diagram of a network node 36 (e.g., a radio access node 14 such as, for example, a gNB) or a core network node according to some embodiments of the present disclosure.
  • the network node 36 includes a control system 38 that includes circuitry comprising one or more processors 40 (e.g., CPUs, ASICs, DSPs, FPGAs, and/or the like) and memory 42.
  • the control system 38 also includes a network interface 44.
  • the network node 36 is a radio access node 14
  • the network node 36 also includes one or more radio units 46 that each include one or more transmitters 48 and one or more receivers 50 coupled to one or more antennas 52.
  • the functionality of the network node 36 e.g., the functionality of the radio access node 14 described above may be fully or partially implemented in software that is, e.g., stored in the memory 42 and executed by the processor(s) 40.
  • FIG 14 is a schematic block diagram that illustrates a virtualized embodiment of the network node 36 (e.g., the radio access node 14) according to some embodiments of the present disclosure.
  • a "virtualized" network node 36 is a network node 36 in which at least a portion of the functionality of the network node 36 is implemented as a virtual component (e.g., via a virtual machine(s) executing on a physical processing node(s) in a network(s)).
  • the network node 36 optionally includes the control system 38, as described with respect to Figure 13.
  • the network node 36 is the radio access node 14
  • the network node 36 also includes the one or more radio units 46, as described with respect to Figure 13.
  • the control system 38 (if present) is connected to one or more processing nodes 54 coupled to or included as part of a network(s) 56 via the network interface 44.
  • the one or more radio units 46 are connected to the one or more processing nodes 54 via a network interface(s).
  • all of the functionality of the network node 36 described herein may be implemented in the processing nodes 54 (i.e., the network node 36 does not include the control system 38 or the radio unit(s) 46).
  • Each processing node 54 includes one or more processors 58 (e.g., CPUs, ASICs, DSPs, FPGAs, and/or the like), memory 60, and a network interface 62.
  • functions 64 of the network node 36 described herein are implemented at the one or more processing nodes 54 or distributed across the control system 38 (if present) and the one or more processing nodes 54 in any desired manner.
  • some or all of the functions 64 of the network node 36 described herein are implemented as virtual components executed by one or more virtual machines implemented in a virtual environment(s) hosted by the processing node(s) 54.
  • additional signaling or communication between the processing node(s) 54 and the control system 38 (if present) or alternatively the radio unit(s) 46 (if present) is used in order to carry out at least some of the desired functions.
  • the control system 38 may not be included, in which case the radio unit(s) 46 (if present) communicates directly with the processing node(s) 54 via an appropriate network interface(s).
  • higher layer functionality e.g., layer 3 and up and possibly some of layer 2 of the protocol stack
  • the network node 36 may be implemented at the processing node(s) 54 as virtual components (i.e., implemented "in the cloud")
  • lower layer functionality e.g., layer 1 and possibly some of layer 2 of the protocol stack
  • a computer program including instructions which, when executed by the at least one processor 40, 58, causes the at least one processor 40, 58 to carry out the functionality of the network node 36 or a processing node 54 according to any of the embodiments described herein is provided.
  • a carrier containing the aforementioned computer program product is provided.
  • the carrier is one of an electronic signal, an optical signal, a radio signal, or a computer readable storage medium (e.g., a non-transitory computer readable medium such as the memory 60).
  • FIG. 15 is a schematic block diagram of the network node 36 (e.g., the radio access node 14 or a core network node) according to some other embodiments of the present disclosure.
  • the network node 36 includes one or more modules 66, each of which is implemented in software.
  • the module(s) 66 provide the functionality of the network node 36 described herein.
  • the module(s) 66 may comprise, for example, an obtaining module operable to perform the function of step 200 of Figure 9, a controlling module operable to perform the function of step 202 of Figure 9, an obtaining module (optional) operable to perform the function of step 204 of Figure 9, and a using and/or sending module (optional) operable to perform the function of step 206 of Figure 9.
  • the module(s) 66 may comprise, for example, an obtaining module (optional) operable to perform the function of step 300 of Figure 10, a controlling module operable to perform the function of step 302 of Figure 10, an obtaining module operable to perform the function of step 304 of Figure 10, and a using and/or sending module (optional) operable to perform the function of step 306 of Figure 10.
  • embodiments of the present disclosure provide a more reliable and stable RLM and RLF procedure in NR deployments with
  • embodiments of the present disclosure provide the possibility to control set(s) of beams for which RLM and/or RLF are to be performed.
  • Embodiment 1 A method of operation of a radio node (12, 14) for multi-beam Radio Link Monitoring, RLM, and/or multi-beam Radio Link Failure, RLF, comprising: performing (102) quality monitoring for at least a first subset of a plurality of beams of a cell (16); and performing (104) one or more actions if a result of performing (102) quality monitoring for at least the first subset of the plurality of beams of the cell (16) indicates a radio problem and/or a RLF problem.
  • Embodiment 2 The method of embodiment 1 wherein the one or more actions comprise link recovery, indicating the problem to a higher layer, indicating the problem to another node, going to an inactive state, going to an idle state, and/or triggering a timer or counter.
  • Embodiment 3 The method of embodiment 1 or 2 wherein performing (102) quality monitoring for at least the first subset of the plurality of beams of the cell (16) comprises: determining (102A) the first subset of the plurality of beams of the cell (16); and performing (102B) quality monitoring for the first subset of the plurality of beams of the cell (16).
  • Embodiment 4 The method of embodiment 3 wherein performing (102) quality monitoring for at least the first subset of the plurality of beams of the cell (16) further comprises: determining (102C) a second subset of the plurality of beams of the cell (16); and performing (102D) quality monitoring for the second subset of the plurality of beams of the cell (16).
  • Embodiment 5 The method of any one of embodiments 1 to 4 wherein performing (102) quality monitoring for at least the first subset of the plurality of beams of the cell (16) further comprises meeting (102E) one or more requirements related to performing (102) quality monitoring for at least the first subset of the plurality of beams of the cell (16).
  • Embodiment 6 The method of any one of embodiments 1 to 5 wherein performing (102) quality monitoring for at least the first subset of the plurality of beams of the cell (16) comprises: performing (102) quality monitoring for two or more subsets of the plurality of beams of the cell (16), the two or more subsets comprising the first subset; and determining (102F) a change in at least one of the two or more subsets of the plurality of beams of the cell (16).
  • Embodiment 7 The method of embodiment 6 wherein performing (102) quality monitoring for at least the first subset of the plurality of beams of the cell (16) further comprises adapting one or more requirements related to performing (102) quality monitoring for the two or more subsets based on the determined change in the at least one of the two or more subsets.
  • Embodiment 8 The method of any one of embodiments 1 to 7 further comprising indicating (100), to another node (12, 14), an ability of the radio node (12, 14) associated with multi-beam RLM and/or multi-beam RLF.
  • Embodiment 9 A radio node (12, 14) for multi-beam RLM and/or RLF, the radio node (12, 14) adapted to operate according to the method of any one of embodiments 1 to 8.
  • Embodiment 10 A computer program comprising instructions which, when executed on at least one processor, cause the at least one processor to carry out the method according to any one of embodiments 1 to 8.
  • Embodiment 1 1 A carrier containing the computer program of claim 10, wherein the carrier is one of an electronic signal, an optical signal, a radio signal, or a computer readable storage medium.
  • Embodiment 12 A radio node (12, 14) for multi-beam RLM and/or multi-beam RLF, the radio node (12, 14) comprising: at least one transmitter (28, 48) and at least one receiver (30, 50); and at least one processor (22, 40) adapted to cause the radio node (12, 14) to operate according to the method of any one of embodiments 1 to 8.
  • Embodiment 13 A radio node (12, 14) for multi-beam RLM and/or multi-beam RLF, the radio node (12, 14) comprising: at least one module (34, 66) adapted to operate according to the method of any one of embodiments 1 to 8.
  • Embodiment 14 A method of operation of a network node (36) related to multi-beam Radio Link Monitoring, RLM, and/or multi-beam Radio Link Failure, RLF, comprising: obtaining (200) an indication of an ability of a radio node (12, 14) associated with multi-beam RLM and/or multi-beam RLF; and controlling (202) RLM and/or RLF procedures performed by the radio node (12, 14) based on the indication.
  • Embodiment 15 The method of embodiment 14 wherein controlling (202) RLM and/or RLF procedures performed by the radio node (12, 14) based on the indication comprises: configuring (202A) at least one parameter in the radio node (12, 14) used for RLM and/or RLF procedures for a first subset of beams associated with a cell (16).
  • Embodiment 16 The method of embodiment 15 wherein controlling (202) RLM and/or RLF procedures performed by the radio node (12, 14) based on the indication further comprises: configuring (202B) at least one parameter in the radio node (12, 14) used for RLM and/or RLF procedures for a second subset of beams associated with the cell (16).
  • Embodiment 17 The method of any one of embodiments 14 to 16 further comprising obtaining (204) a result of controlling (202) RLM and/or RLF procedures performed by the radio node (12, 14).
  • Embodiment 18 The method of embodiment 17 further comprising using (206) the result for one or more operational tasks and/or sending (206) the result to another node (12, 14).
  • Embodiment 19 A network node (36) for a wireless system (10) that enables multi-beam RLM and/or RLF, the network node (36) adapted to operate according to the method of any one of embodiments 14 to 18.
  • Embodiment 20 A computer program comprising instructions which, when executed on at least one processor, cause the at least one processor to carry out the method according to any one of embodiments 14 to 18.
  • Embodiment 21 A carrier containing the computer program of claim
  • the carrier is one of an electronic signal, an optical signal, a radio signal, or a computer readable storage medium.
  • Embodiment 22 A network node (36) for a wireless system (10) that enables multi-beam RLM and/or RLF, the network node (36) comprising: at least one transmitter (48) and/or a network interface (44); and at least one processor (40) adapted to cause the network node (36) to operate according to the method of any one of embodiments 14 to 28.
  • Embodiment 23 A network node (36) for a wireless system (10) that enables multi-beam RLM and/or RLF, the network node (36) comprising: at least one module (66) adapted to operate according to the method of any one of embodiments 14 to 18.
  • Embodiment 24 A method of operation of a network node (36) related to multi-beam Radio Link Monitoring, RLM, and/or multi-beam Radio Link Failure, RLF, comprising: controlling (302) RLM and/or RLF procedures performed by a radio node (12, 14), wherein controlling (302) RLM and/or RLF procedures performed by the radio node (12, 14) comprises configuring at least one parameter in the radio node (12, 14) used for RLM and/or RLF procedures for a first subset of beams associated with a cell (16); and obtaining (304) a result of controlling (302) RLM and/or RLF procedures performed by the radio node (12, 14).
  • Embodiment 25 The method of embodiment 24 wherein controlling (302) RLM and/or RLF procedures performed by the radio node (12, 14) based on the indication further comprises: configuring (302A) at least one parameter in the radio node (12, 14) used for RLM and/or RLF procedures for a second subset of beams associated with the cell (16).
  • Embodiment 26 The method of embodiment 24 or 25 further comprising using (306) the result for one or more operational tasks and/or sending (306) the result to another node (12, 14).
  • Embodiment 27 A network node (36) for a wireless system (10) that enables multi-beam RLM and/or RLF, the network node (36) adapted to operate according to the method of any one of embodiments 24 to 26.
  • Embodiment 28 A computer program comprising instructions which, when executed on at least one processor, cause the at least one processor to carry out the method according to any one of embodiments 24 to 26.
  • Embodiment 29 A carrier containing the computer program of claim 28, wherein the carrier is one of an electronic signal, an optical signal, a radio signal, or a computer readable storage medium.
  • Embodiment 30 A network node (36) for a wireless system (10) that enables multi-beam RLM and/or RLF, the network node (36) comprising: at least one transmitter (48) and/or a network interface (44); and at least one processor (40) adapted to cause the network node (36) to operate according to the method of any one of embodiments 24 to 26.
  • Embodiment 31 A network node (36) for a wireless system (10) that enables multi-beam RLM and/or RLF, the network node (36) comprising: at least one module (66) adapted to operate according to the method of any one of embodiments 24 to 26.

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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 des systèmes et des procédés de surveillance de qualité de liaison radio à faisceaux multiples. Dans certains modes de réalisation, un procédé de fonctionnement d'un nœud radio pour une surveillance de liaison radio multi-faisceau (RLM) et/ou une défaillance de liaison radio multi-faisceau (RLF) comprend la réalisation d'une surveillance de qualité pour au moins un premier sous-ensemble d'une pluralité de faisceaux d'une cellule et la réalisation d'une ou plusieurs actions si un résultat de réalisation d'une surveillance de qualité pour au moins le premier sous-ensemble de la pluralité de faisceaux de la cellule indique un problème de liaison radio et/ou un problème de RLF. De cette manière, des procédures RLM et/ou RLF plus fiables et stables sont fournies dans un réseau cellulaire qui utilise la formation de faisceau.
PCT/SE2018/050073 2017-02-03 2018-02-01 Procédés de surveillance de qualité de liaison radio basée sur la formation de faisceau dans nr WO2018143875A1 (fr)

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WO2020164398A1 (fr) * 2019-02-14 2020-08-20 华为技术有限公司 Procédé et dispositif de surveillance de liaison radio (rlm)
WO2021007865A1 (fr) * 2019-07-18 2021-01-21 Oppo广东移动通信有限公司 Procédé de traitement d'informations, dispositif de réseau et dispositif de terminal
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CN113748704A (zh) * 2019-04-18 2021-12-03 华为技术有限公司 一种更改无线链路监测配置的方法及设备

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Cited By (11)

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Publication number Priority date Publication date Assignee Title
CN111294891A (zh) * 2018-12-07 2020-06-16 成都华为技术有限公司 一种天线面板及波束的管理方法和设备
CN111294891B (zh) * 2018-12-07 2021-06-22 成都华为技术有限公司 一种天线面板及波束的管理方法和设备
US20210345152A1 (en) * 2019-01-18 2021-11-04 Vivo Mobile Communication Co., Ltd. Measurement method and device
WO2020164398A1 (fr) * 2019-02-14 2020-08-20 华为技术有限公司 Procédé et dispositif de surveillance de liaison radio (rlm)
CN113748704A (zh) * 2019-04-18 2021-12-03 华为技术有限公司 一种更改无线链路监测配置的方法及设备
CN113748704B (zh) * 2019-04-18 2024-04-09 华为技术有限公司 一种更改无线链路监测配置的方法及设备
WO2021007865A1 (fr) * 2019-07-18 2021-01-21 Oppo广东移动通信有限公司 Procédé de traitement d'informations, dispositif de réseau et dispositif de terminal
CN113475029A (zh) * 2019-07-18 2021-10-01 Oppo广东移动通信有限公司 一种信息处理方法、网络设备、终端设备
CN113475029B (zh) * 2019-07-18 2023-09-05 Oppo广东移动通信有限公司 一种信息处理方法、网络设备、终端设备
CN110913419A (zh) * 2019-12-11 2020-03-24 展讯通信（上海）有限公司 用于辅链路的波束失败恢复方法及装置、存储介质、终端
CN110913419B (zh) * 2019-12-11 2021-08-17 展讯通信（上海）有限公司 用于辅链路的波束失败恢复方法及装置、存储介质、终端

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