WO2021254590A1 - Commande de relâchement de mesures de surveillance de liaison radioélectrique - Google Patents

Commande de relâchement de mesures de surveillance de liaison radioélectrique Download PDF

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Publication number
WO2021254590A1
WO2021254590A1 PCT/EP2020/066465 EP2020066465W WO2021254590A1 WO 2021254590 A1 WO2021254590 A1 WO 2021254590A1 EP 2020066465 W EP2020066465 W EP 2020066465W WO 2021254590 A1 WO2021254590 A1 WO 2021254590A1
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measurement period
rlm
configuration
period
measurements
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PCT/EP2020/066465
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English (en)
Inventor
Daniela Laselva
Lars Dalsgaard
Erika PORTELA LOPES DE ALMEIDA
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Nokia Technologies Oy
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Priority to PCT/EP2020/066465 priority Critical patent/WO2021254590A1/fr
Publication of WO2021254590A1 publication Critical patent/WO2021254590A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic

Definitions

  • This description relates to wireless communications, and in particular, radio link monitoring (RLM) and beam failure detection (BFD) measurements.
  • RLM radio link monitoring
  • BFD beam failure detection
  • a communication system may be a facility that enables communication between two or more nodes or devices, such as fixed or mobile communication devices. Signals can be carried on wired or wireless carriers.
  • LTE Long Term Evolution
  • APs base stations or access points
  • eNBs Evolved Node B
  • UE user equipments
  • LTE has included a number of improvements or developments.
  • 5G New Radio (NR) development is part of a continued mobile broadband evolution process to meet the requirements of 5G, similar to earlier evolution of 3G & 4G wireless networks.
  • 5G is also targeted at the new emerging use cases in addition to mobile broadband.
  • a goal of 5G is to provide significant improvement in wireless performance, which may include new levels of data rate, latency, reliability, and security.
  • 5GNR may also scale to efficiently connect the massive Internet of Things (IoT), and may offer new types of mission-critical services.
  • Ultra-reliable and low-latency communications (URLLC) devices may require high reliability and very low latency.
  • a method, apparatus, and a computer-readable storage medium are provided for relaxation of radio link monitoring measurements.
  • the method may include a user equipment determining that a first measurement period is shorter than a second measurement period or a first condition is satisfied, determining, in response to determining that the first measurement period is shorter than the second measurement period or the first condition is satisfied, a modified first measurement period based at least on a third measurement period or a scaling of the first measurement period, respectively, and performing measurements based at least on the modified first measurement period.
  • the method may include a network node transmitting a radio link monitoring reference signal (RLM-RS) resource configuration and a radio resource management (RRM) measurement configuration to a user equipment (UE).
  • RLM-RS radio link monitoring reference signal
  • RRM radio resource management
  • the RLM-RS resource configuration may include criteria to allow the modifying of a radio link monitoring or beam failure detection measurement period by the UE.
  • FIG. l is a block diagram of a wireless network according to an example implementation.
  • FIG. 2A illustrates relaxation of RLM/BFD measurements, according to an example implementation.
  • FIG. 2B illustrates relaxation of RLM/BFD measurements, according to an additional example implementation.
  • FIG. 3 is a flow chart illustrating controlling of RLM measurements relaxation, according to an example implementation.
  • FIG. 4 is a flow chart illustrating controlling of RLM measurements relaxation, according to an additional example implementation.
  • FIGs. 5A-6B illustrates relaxation of RLM measurements, according to various example implementations.
  • FIG. 7 is a block diagram of a node or wireless station (e.g., base station/access point or mobile station/user device/UE), according to an example implementation.
  • DETAILED DESCRIPTION e.g., base station/access point or mobile station/user device/UE
  • FIG. 1 is a block diagram of a wireless network 130 according to an example implementation.
  • user devices UDs
  • BS base station
  • AP access point
  • eNB enhanced Node B
  • gNB next-generation Node B
  • At least part of the functionalities of an access point (AP), base station (BS), (e)Node B (eNB), or gNB may also be carried out by any node, server or host which may be operably coupled to a transceiver, such as a remote radio head.
  • BS or AP
  • BS 134 provides wireless coverage within a cell 136, including to user devices 131, 132, 133 and 135. Although only four user devices are shown as being connected or attached to BS 134, any number of user devices may be provided. BS 134 is also connected to a core network 150 via a SI interface 151. This is merely one simple example of a wireless network, and others may be used.
  • a user device may refer to a portable computing device that includes wireless mobile communication devices operating with or without a subscriber identification module (SIM), including, but not limited to, the following types of devices: a mobile station (MS), a mobile phone, a cell phone, a smartphone, a personal digital assistant (PDA), a handset, a device using a wireless modem (alarm or measurement device, etc.), a laptop and/or touch screen computer, a tablet, a phablet, a game console, a notebook, and a multimedia device, as examples, or any other wireless device.
  • SIM subscriber identification module
  • a user device may also be a nearly exclusive uplink only device, of which an example is a camera or video camera loading images or video clips to a network.
  • core network 150 may be referred to as Evolved Packet Core (EPC), which may include a mobility management entity (MME) which may handle or assist with mobility /handover of user devices between BSs, one or more gateways that may forward data and control signals between the BSs and packet data networks or the Internet, and other control functions or blocks.
  • EPC Evolved Packet Core
  • MME mobility management entity
  • gateways may forward data and control signals between the BSs and packet data networks or the Internet, and other control functions or blocks.
  • New Radio (5G) development may support a number of different applications or a number of different data service types, such as for example: machine type communications (MTC), enhanced machine type communication (eMTC), Internet of Things (IoT), and/or narrowband IoT user devices, enhanced mobile broadband (eMBB), and ultra-reliable and low-latency communications (URLLC).
  • MTC machine type communications
  • eMTC enhanced machine type communication
  • IoT Internet of Things
  • URLLC ultra-reliable and low-latency communications
  • IoT may refer to an ever-growing group of objects that may have Internet or network connectivity, so that these objects may send information to and receive information from other network devices.
  • many sensor type applications or devices may monitor a physical condition or a status, and may send a report to a server or other network device, e.g., when an event occurs.
  • Machine Type Communications MTC or machine to machine communications
  • MTC Machine Type Communications
  • eMBB Enhanced mobile broadband
  • Ultra-reliable and low-latency communications is a new data service type, or new usage scenario, which may be supported for New Radio (5G) systems.
  • 5G New Radio
  • This enables emerging new applications and services, such as industrial automations, autonomous driving, vehicular safety, e-health services, and so on.
  • 3 GPP targets in providing up to e.g., 1 ms U-Plane (user/data plane) latency connectivity with l-le-5 reliability, by way of an illustrative example.
  • U-Plane user/data plane
  • URLLC user devices/UEs may require a significantly lower block error rate than other types of user devices/UEs as well as low latency.
  • a URLLC UE or URLLC application on a UE
  • the various example implementations may be applied to a wide variety of wireless technologies or wireless networks, such as LTE, LTE-A, 5G, IoT, MTC, eMTC, eMBB, URLLC, etc., or any other wireless network or wireless technology.
  • wireless technologies or wireless networks such as LTE, LTE-A, 5G, IoT, MTC, eMTC, eMBB, URLLC, etc.
  • LTE Long Term Evolution
  • LTE-A Fifth Generation
  • 5G Fifth Generation
  • IoT Fifth Generation
  • MTC Mobility Management Entity
  • MIMO Multiple Input, Multiple Output
  • MIMO may refer to a technique for increasing the capacity of a radio link using multiple transmit and receive antennas to exploit multipath propagation.
  • MIMO may include the use of multiple antennas at the transmitter and/or the receiver.
  • MIMO may include a multi-dimensional approach that transmits and receives two or more unique data streams through one radio channel.
  • MIMO may refer to a technique for sending and receiving more than one data signal simultaneously over the same radio channel by exploiting multipath propagation.
  • multi-user multiple input, multiple output enhances MIMO technology by allowing a base station (BS) or other wireless node to simultaneously transmit or receive multiple streams to different user devices or UEs, which may include simultaneously transmitting a first stream to a first UE, and a second stream to a second UE, via a same (or common or shared) set of physical resource blocks (PRBs) (e.g., where each PRB may include a set of time-frequency resources).
  • PRBs physical resource blocks
  • a BS may use precoding to transmit data to a EE (based on a precoder matrix or precoder vector for the EE).
  • a EE may receive reference signals or pilot signals, and may determine a quantized version of a DL channel estimate, and then provide the BS with an indication of the quantized DL channel estimate.
  • the BS may determine a precoder matrix based on the quantized channel estimate, where the precoder matrix may be used to focus or direct transmitted signal energy in the best channel direction for the EE.
  • each EE may use a decoder matrix may be determined, e.g., where the EE may receive reference signals from the BS, determine a channel estimate of the DL channel, and then determine a decoder matrix for the DL channel based on the DL channel estimate.
  • a precoder matrix may indicate antenna weights (e.g., an amplitude/gain and phase for each weight) to be applied to an antenna array of a transmitting wireless device.
  • a decoder matrix may indicate antenna weights (e.g., an amplitude/gain and phase for each weight) to be applied to an antenna array of a receiving wireless device. This applies to EE as well when a EE is transmitting data to a BS.
  • a receiving wireless user device may determine a precoder matrix using Interference Rejection Combining (IRC) in which the user device may receive reference signals (or other signals) from a number of BSs (e.g., and may measure a signal strength, signal power, or other signal parameter for a signal received from each BS), and may generate a decoder matrix that may suppress or reduce signals from one or more interferers (or interfering cells or BSs), e.g., by providing a null (or very low antenna gain) in the direction of the interfering signal, in order to increase a signal-to interference plus noise ratio (SINR) of a desired signal.
  • IRC Interference Rejection Combining
  • a receiver may use, for example, a Linear Minimum Mean Square Error Interference Rejection Combining (LMMSE-IRC) receiver to determine a decoding matrix.
  • LMMSE-IRC Linear Minimum Mean Square Error Interference Rejection Combining
  • the IRC receiver and LMMSE-IRC receiver are merely examples, and other types of receivers or techniques may be used to determine a decoder matrix.
  • the receiving UE/user device may apply antenna weights (e.g., each antenna weight including amplitude and phase) to a plurality of antennas at the receiving UE or device based on the decoder matrix.
  • a precoder matrix may include antenna weights that may be applied to antennas of a transmitting wireless device or node.
  • RLM radio link monitoring
  • the lower layers of the UE indicate to higher layers whenever the signal quality (e.g., based on block error ratio (BLER), e.g., of a physical downlink control channel (PDCCH) transmission) is below a threshold (e.g., Qout) by sending an out-of-sync indication (OOS).
  • BLER block error ratio
  • PDCCH physical downlink control channel
  • OOS out-of-sync indication
  • the UE’s lower layers send an OOS indication when all the reference signals monitored by the UE for RLM purposes (e.g., RLM-RSs) are below the Q ou t threshold.
  • the RLM-RSs can be channel state information-reference signals (CSI-RSs) or synchronization signal blocks (SSBs).
  • CSI-RSs channel state information-reference signals
  • SSBs synchronization signal blocks
  • the UE can be configured to measure up to 2, 4 or 8 RLM-RSs, depending on the frequency range.
  • the UE will start a timer (e.g., a T310 timer) and declare a radio link failure (RLF) if the signal quality does not improve prior to the expiration of the T310 timer.
  • a timer e.g., a T310 timer
  • RLF radio link failure
  • the UE’s compares the radio link quality with a second threshold (e.g., Qin) and sends an in-sync (IS) indication to higher layers if the radio link quality is above Qin.
  • An IS indication is sent if at least one RLM-RS is above the Qi n threshold.
  • N311 counter a number (e.g., N311 counter) of IS indications are sent prior to the expiration of the T310 timer. If a number (e.g., N311 counter) of IS indications are sent prior to the expiration of the T310 timer, the UE resets the N311 counter and T310 timer, and RLF is not declared. It should be noted that, in good radio conditions, the UE will not send any indications to higher layers, despite the UE constantly measuring the quality of the radio channel.
  • N311 counter e.g., N311 counter
  • the requirements that define UE measurements for RLM in NR standards are defined in 3GPP TS 38.133 and are based on RLM-RS periodicity (e.g., TSSB, which may be defined as the periodicity of the SSB configured for RLM), discontinuous reception (DRX) periodicity (e.g., TDRX, which may be defined as the DRX cycle length), and/or a factor “P” which may depend on the overlapping of SSBs and measurement gaps.
  • the RLM-RSs can be configured for RLM purposes, beam failure detection (BFD) purposes, or both, as per RadioLinkMonitoringConfig in TS 38.331. It should be noted that the current RLM requirements are defined based on the RLM-RS periodicity, which might be defined as a cell-wise parameter (e.g., based on the SSB transmission timing), besides the DRX cycle.
  • a beam failure may be generally defined as a condition when the quality of the beam pair link for control channels becomes too low to maintain communications. Beam failure may be detected by monitoring a beam failure detection reference signal and assessing if a beam failure trigger condition has been met.
  • the beam failure detection reference signal can be an SSB or a CSI-RS.
  • radio resource management (RRM) measurements for UEs in RRC CONNECTED mode are defined based on synchronization signal block (SSB) based measurement timing configuration (SMTC) periodicity and DRX cycle, which are both configured on a per UE basis.
  • SSB synchronization signal block
  • SMTC measurement timing configuration
  • DRX cycles ⁇ 320ms when configuring short DRX cycles that may be required for delay sensitive services such as VoIP, for example, DRX cycles ⁇ 320ms, no relaxation may be achieved.
  • the configuration of the DRX cycle is only related to the characteristics of the data traffic/application required by the UE and reflects the desired trade-off between an acceptable latency that a given UE/application can tolerate and UE power consumption.
  • the problem encountered when coupling measurement relaxation with DRX is that, for instance, in good radio-conditions and short DRX cycle, the UE will be constantly and unnecessarily performing power consuming measurements for RLM or BFD purposes but will not indicate anything to higher layers as the channel conditions are not going to be degraded within short evaluation periods. If the UE is at cell center and with low mobility, the good channel quality can be maintained during a large time period. Therefore, there is a desire and/or need to save (conserve) UE power by not performing power consuming measurements if the channel conditions are not degraded and without changing the DRX cycle of the UE.
  • the present disclosure describes mechanisms/procedures to relax RLM/BFD measurements without changing the UE DRX cycle, if the channel conditions are not likely to be degraded.
  • the present disclosure describes a mechanism that relaxes the performing of measurements (e.g., RLM/BFD measurements) by increasing the measurement period, to avoid the UE unnecessarily performing more frequent RLM/BFD measurements as compared to RRM measurements (e.g., when in good radio conditions).
  • the relaxation may be achieved by: i) increasing the evaluation period for RLM/BFD keeping the (minimum required) number of samples per period unvaried; or ii) decreasing the number of samples per period while keeping the evaluation period unvaried. In both options, the interspacing between two measurements may be relaxed (increased) for UE power savings.
  • the present disclosure describes a method for controlling (or managing) the relaxation of RLM measurements.
  • the method may include a UE determining that an RLM measurement period is shorter than a RRM measurement period or a first condition is satisfied and determining a modified RLM measurement period based at least on a SMTC period or RRM period or a scaling of the RLM measurement period.
  • the method further includes performing measurements based at least on the modified RLM measurement period.
  • FIG. 2A illustrates relaxation of RLM/BFD measurements 200, according to an example implementation.
  • FIG. 2A illustrates a user equipment, e.g., UE 202, that may be in communication with a gNB, e.g., gNB 204.
  • a gNB e.g., gNB 204.
  • the UE may determine that the UE is in an RRC connected (e.g., RRC CONNECTED) mode.
  • RRC connected mode the UE has a radio link with the gNB.
  • the UE may receive an RRM measurement configuration from the gNB.
  • the RRM measurement configuration may include an RRM measurement period, a synchronization signal block (SSB) based measurement timing configuration (SMTC) period, set of SSBs to be measured, etc.
  • SSB synchronization signal block
  • SMTC measurement timing configuration
  • the UE may receive an RLM reference signal (RLM-RS) resource configuration (e.g., RLM-RS resource set configuration) from the gNB.
  • RLM-RS resource configuration e.g., RLM-RS resource set configuration
  • the RLM-RS resource configuration may include relaxation criteria or conditions for relaxation of RLM measurements.
  • the relaxation of RLM measurements may be defined as performing of RLM/BFD measurements not strictly based on RLM-RS resource configuration received from the gNB. In other words, the UE may perform RLM/BFD measurements less frequently and/or for longer duration.
  • the UE may perform RLM/BFD measurements on lesser number of RLM-RS resources than that are configured.
  • the RLM-RS resource configuration may include a channel state information reference signal (CSI-RS) resource configuration or a synchronization signal block (SSB) resource configuration.
  • CSI-RS channel state information reference signal
  • SSB synchronization signal block
  • the resource configurations may be determined (e.g., implicitly) by the UE if not configured (e.g., explicitly) by the gNB.
  • the UE monitors downlink link quality based on a reference signal in the configured RLM-RS resource(s) in order to detect the downlink radio link quality of the PCell and PSCell.
  • the configured RLM-RS resources can be SSBs, CSI-RSs, or a mix of SSBs and CSI-RSs.
  • UE is not required to perform RLM outside the active downlink bandwidth part (DL BWP).
  • the UE estimates the downlink radio link quality and compares it to the thresholds Q out and Qi n for monitoring downlink radio link quality of the cell.
  • the present disclosure targets relaxation of RLM/BFD measurements by increasing the measurement period so that the UE does not perform RLM/BFD measurements more frequently, when compared to RRM measurements, in good radio conditions. This may be achieved by increasing the measurement period (which may be referred to as an evaluation period) for RLM/BFD measurement while keeping the number of samples per period unvaried (minimum required samples met) or by decreasing the number of samples per period while keeping the measurement period unvaried. In both these scenarios, the interspacing between two measurements is relaxed (increased) for UE power savings.
  • the present disclosure describes the UE performing RLM/BFD measurements on reduced number of RLM-RS resources than that are configured to achieve power savings, which may be further combined with the increased measurement period or decreased number of samples per period as described earlier.
  • the RLM configuration may include RLM reference signal (RLM-RS) configuration which may be CSI-RS or SSB configuration.
  • RLM CSI-RS configuration may further include relaxation criteria, conditions, or parameters for relaxation of RLM measurements.
  • the relaxation criteria/conditions may indicate performing RLM measurements on a relaxed schedule when certain criterion/criteria are met or when certain conditions are satisfied.
  • the UE may receive an RLM reference signal from the gNB.
  • the RLM RSs may be a channel state information reference signal (CSI-RS).
  • the RLM RS may be a synchronization signal block (SSB).
  • the SSB may include primary and secondary synchronization signals (PSS and SSS) and a broadcast channel (PBCH), which may include a master information block (MIB).
  • PSS and SSS primary and secondary synchronization signals
  • PBCH broadcast channel
  • MIB master information block
  • the UE may determine whether an RLM measurement period is shorter an RRM measurement period or a radio link condition is satisfied.
  • the RLM measurement period may include an in-sync measurement period during which the UE measures channel quality to determine whether the channel quality is above the Qi n threshold and an and out-of-sync measurement period during which the UE measures channel quality to determine whether channel quality is above the Q out threshold.
  • the radio link condition may be related to determining whether the radio link quality is good when the UE is configured with short DRX or when the UE is configured with short DRX cycles with long DRX.
  • the UE may perform RLM/BFD measurements based on a modified RLM measurement period which may be determined based on RRM measurement period (e.g., SMTC) or based on scaling of the RLM measurement period.
  • RRM measurement period e.g., SMTC
  • the UE may perform RLM/BFD measurements in a relaxed manner (or use relaxation allowance) or apply scaling factors.
  • the scaling factors may be UE-specific.
  • the modified RLM measurement period or the scaling of the RLM measurement period are further described in detail in reference to FIGs. 5A, 5B, 6A, and 6B.
  • the UE may perform RLM measurements in a relaxed manner to conserve UE’s power.
  • FIG. 2B illustrates relaxation of RLM/BFD measurements 250, according to an additional example implementation.
  • FIG. 2B illustrates a user equipment, e.g., UE 202, that may be in communication with a gNB, e.g., gNB 204.
  • a gNB e.g., gNB 204.
  • a UE e.g., UE 202 may receive RLM-RS resource configuration from a gNB, e.g., gNB 204.
  • the gNB may configure the UE, based at least on the RLM-RS resource configuration, to relax RLM/BFD measurements when the gNB or the UE determines that one or more relaxation conditions are satisfied.
  • the relaxation conditions that may be considered to determine whether to allow relaxation of RLM/BFD measurements may include one or more of: i) difference in signal levels between the serving cell and the best neighbor above a threshold (e.g., first threshold); ii) absolute signal level of serving cell above a threshold (e.g., a second threshold, which may be the same Q out threshold) which may indicate that the UE is not in cell-edge conditions; and/or iii) variation in signal level over time below a threshold (e.g., a third threshold) which may indicate a low mobility condition.
  • a threshold e.g., first threshold
  • absolute signal level of serving cell above a threshold e.g., a second threshold, which may be the same Q out threshold
  • variation in signal level over time below a threshold e.g., a third threshold
  • Operations at 266 and 268 may be same or similar to operations at 216 and 218 of FIG. 2 A.
  • the UE may determine that the one or more relaxation conditions are satisfied.
  • the UE may monitor UE’s link quality based on, for example, measurements, to determine that one or more relaxation conditions, as defined in the RLM-RS resource configuration, are satisfied.
  • the gNB may monitor UE’s link quality based on, for example, measurement reports received from the UE, to determine that one or more relaxation conditions are satisfied.
  • the measurements/measurements reports may include (or based on) reference signal received power (RSRP) measurements, reference signal received quality (RSRQ) measurements, signal-to-noise ratio (SNR), etc.
  • RSRP reference signal received power
  • RSS reference signal received quality
  • SNR signal-to-noise ratio
  • the UE may perform RLM/BFD measurements in a relaxed manner.
  • the performing of RLM/BFD measurements in a relaxed manner may include relaxation allowance, applying scaling factors, etc.
  • the scaling factors may be UE-specific.
  • the serving signal quality is good, may be better than the worst interferer, and may remain good for additional evaluation periods, and thereby making it safer (e.g., from a performance perspective) to relax the performing of RLM/BFD measurements.
  • the additional evaluation periods may be determined using a counter.
  • the relaxation period may be applied for a given time period that may be counted as a number of subsequent evaluation periods.
  • the relaxation condition may include determining whether relaxation to be applied is fulfilled for a period (e.g., cover period, timer, number of samples, etc.).
  • the Rel-16 relaxation conditions of not-in-cell-edge and low mobility defined for RRM measurements relaxation in RRC Idle/Inactive may be used as baseline for the network estimate, which may be based on the UE report of the serving cell’s quality.
  • the network may indicate whether the UE can apply the Rel-16 conditions of not-in-cell-edge and low mobility based on RSRP level of the serving cell to determine whether the triggers for relaxation of RLM/BFD measurements are met.
  • the gNB may send a relaxation indication to the UE in response to the gNB determining that the relaxation condition is satisfied.
  • the UE may perform RLM/BFD measurements under relaxed conditions.
  • the UE may perform the RLM/BFD under relaxed conditions based on, for example, a modified RLM measurement period which may be determined based on RRM measurement period (e.g., SMTC) or based on scaling of the RLM measurement period, as described earlier in reference to FIG. 2A.
  • RRM measurement period e.g., SMTC
  • the UE may perform RLM/BFD measurements in a relaxed manner (or use relaxation allowance) or apply scaling factors.
  • the scaling factors may be UE-specific.
  • the modified RLM measurement period or the scaling of the RLM measurement period are further described in detail in reference to FIGs. 5A, 5B, 6A, and 6B.
  • the UE may perform RLM measurements in a relaxed manner to conserve UE’s power.
  • FIG. 3 is a flow chart 300 illustrating controlling of RLM measurements relaxation, according to an example implementation.
  • a UE e.g., UE 202, may determine that a first measurement period is shorter than a second measurement period or a first condition is satisfied.
  • the UE may determine whether an RLM measurement period (e.g., the first measurement period) is shorter than an RRM measurement period (e.g., the second measurement period).
  • the RLM measurement period in some implementations, for example, may include an in-sync measurement period and out- of-sync measurement periods.
  • the in-sync measurement period may be used when the UE tries to determine whether at least one RLM-RS is above the Qi n threshold.
  • the duration that the UE performs the measurements for determining whether to send an IS indication includes the in-sync measurement period.
  • the out-of-sync measurement period may be used when the UE tries to determine whether all the RLM-RSs monitored by the UE are below the Q out threshold.
  • the duration that the UE performs the measurements for determining whether to send an 00 S indication may be based on the out-of-sync measurement period.
  • the UE may determine whether the RLM measurement period is shorter than the RRM measurement period based on comparing the measurement periods received via the respective configurations (e.g., RLM-RS resource configuration and RRM measurement configuration) from the gNB.
  • the UE may determine whether a first condition, which may be a relaxation condition that may include determining whether the quality of the radio link is good when the UE is configured with short DRX cycles or short periodicity with long DRX cycles.
  • the UE may determine a modified first measurement period based at least on a third measurement period or a scaling of the first measurement period.
  • the modified first measurement period may be based at least on the third measurement period, e.g., an RRM measurement period, which may be further based on a SMTC period (which may have been configured for RRM as described earlier).
  • the modified first measurement period may be configured as illustrated, for example, in FIG. 5 A, which may define out-of- sync and in-sync measurement periods, also referred to as evaluation periods, e.g., T evaiuate-out and T evaiuatejn periods.
  • the RLM measurement period for controlling RLM measurements relaxation may be determined based on SMTC period used for RRM measurements. As the SMTC period is configured on a per-UE basis, the radio conditions of the UE are taken into consideration before the RLM measurements are relaxed.
  • the modified first measurement period may be a third measurement period, e.g., RRM measurement period.
  • the UE may use the RRM measurement period for determining RLM measurement period and thereby extending the RLM measurement period.
  • the sampling rate may be reduced (e.g., more interspaced measurements), as illustrated, for example, in FIG. 5B. This may be likely beneficial to achieve UE power savings when the UE is configured for low DRX cycles (e.g., due to a tight latency target) and/or with a large SMTC period (e.g., to relax RRM measurements as in good radio conditions).
  • the UE may determine the modified RLM measurement period based on a scaling of the RLM measurement period.
  • the RLM measurements may be relaxed by applying one or more relaxation factors.
  • the relaxation factors may depend on DRX cycles. For instance, the measurement activity for RLM when the UE is configured with short DRX cycles may be unnecessarily too high for UEs in good signal quality conditions. When the UE is in good condition, repeating the RLM evaluation more frequently will only waste the UE power, as the probability of radio link problems may be very low.
  • the relaxation factors are determined on a per UE basis, based on the estimate of a UE being in cell center and in low mobility. Therefore, under these conditions, the radio link may not deteriorate rapidly and the RLM measurements may be relaxed safely.
  • the UE may be configured to scale the measurement period of RLM/BFD measurements according to one or more dedicated scaling factor “R.” For example, the evaluation period for in-sync and out-of-sync indications,
  • T evaluate out and Tevaiuatejn periods may be scaled by factors Rin and Rout, respectively.
  • gNB may allow the UE to relax the evaluation periods.
  • the scaling factors Rin and Rout may be the same or different from each other.
  • the measurement periods are illustrated in detail in FIG. 6A.
  • the measurement period may be kept unchanged (not relaxed) while the number of samples used for evaluating the Q ou t (and/or Qin) in the RLM measurement period are lowered as illustrated in FIG. 6B.
  • the gNB may configure the UE to relax the RLM/BFD measurements when the gNB/UE determines that it is safe to apply relaxation for RLM/BFD purposes.
  • the network/UE may monitor certain conditions related to the UE’s link quality e.g., based on the UE measurement (reports), in order to evaluate if any condition is met, in which case, the gNB may send an indication to the UE of RLM relaxation allowance / the UE may start applying the UE-specific scaling factors. These conditions can be based on the RSRP, RSRQ, and SINR.
  • the UE may perform measurements based at least on the modified first measurement period.
  • the UE may perform the RLM/BFD measurements based on SMTC period, RRM measurement period, and/or scaled RLM measurement period.
  • FIG. 4 is a flow chart 400 illustrating controlling of RLM measurements relaxation, according to an additional example implementation.
  • a gNB may transmit an RLM-RS resource configuration and an RRM measurement configuration to a UE, e.g., UE 202.
  • the RLM-RS resource configuration may include criteria to allow the modifying of RLM/BFD measurement period by the UE.
  • FIG. 5A illustrates relaxation of RLM measurements 500, according to an example implementation.
  • FIG. 5 A illustrates configuration of measurement periods (also referred to as evaluation periods) which may include, for example, out-of-sync measurement period (TEvaiuate_out_ssB ) 504 and in-sync measurement period (TEvaiuatejn SSB) 506 for various configurations 502 for performing RLM/BFD measurements in a relaxed manner.
  • the various configurations 502 may include a configuration 512 with no DRX, configuration 522 with DRX cycle ⁇ 320 ms, and/or a configuration 532 with DRX cycle > 320 ms.
  • FIG. 5A illustrates in-sync and out-of-sync measurement (e.g., evaluation) periods.
  • FIG. 5A illustrates out-of-sync measurement period (TEvaiuate_out_ssB) 524 and in-sync measurement period (TEvaiuatejn SSB) 526.
  • the out-of-sync measurement period 524 and/or the in-sync measurement period (TEvaiuate n SSB) 526 may be based on at least relaxed measurement period Rperiod (in addition to TSSB and TDRX) which may be set equal to SMTCperiod if REM relaxation is configured. Alternatively, if RLM relaxation is not configured, out-of-sync measurement period 524 and/or the in-sync measurement period (TEvaiuatejn SSB) 526 may be based on TSSB and TDRX (e.g., Rperiod set to SMTC pe riod).
  • the RLM evaluation period may be extended by using the input to the RRM measurement period tables (Table 9.2.5.2-1 - 4 of TS 38.133), e.g., SMTC period.
  • the SMTC period is configured on a per UE basis, the UE’s radio conditions are taken into consideration, and the measurement durations may be relaxed when the radio conditions are deemed good.
  • FIG. 5B illustrates relaxation of RLM measurements 550, according to an additional example implementation.
  • FIG. 5B illustrates configuration of measurement periods which may include, for example, out-of-sync measurement period (TEvaiuate_out_ssB ) 554 and in-sync measurement period (TEvaiuatejn SSB) 556 for various configurations 552 for performing RLM/BFD measurements in a relaxed manner.
  • the various configurations 552 may include a configuration 562 with no DRX, configuration 572 with DRX cycle ⁇ 320 ms, and/or a configuration 582 with DRX cycle > 320 ms.
  • FIG. 5B illustrates in-sync and out-of-sync measurement periods.
  • FIG. 5A illustrates out-of-sync measurement period (TEvaiuate_out_ssB) 574 and in-sync measurement period (TEvaiuatejn SSB) 576.
  • the out-of-sync measurement period 574 and/or the in-sync measurement period (TEvaiuate n SSB) 576 may be based on at least RRMmeasPeriod (in addition to TSSB and/or TDRX) which may be the measurement period for intra-frequency measurements derived from the applicable Tables in 3GPP XX. YY, e.g., Table 9.2.5.2-1-4.
  • the RLM evaluation period may be modified by using the RRM measurement period (RRM measPe ri od ) as derived from the corresponding tables as shown in FIG. 5B, when deriving the RLM evaluation period, to potentially extend such period.
  • the sampling rate is reduced (e.g., more interspaced measurements) by increasing the evaluation period while keeping the number of samples constant.
  • FIG. 6A illustrates relaxation of RLM measurements 600, according to an example implementation.
  • FIG. 6A illustrates configuration of measurement periods which may include, for example, out-of-sync measurement period (TEvaiuate_out_ssB ) 604 and in-sync measurement period (TEvaiuatejn SSB) 606 for various configurations 602 for performing RLM/BFD measurements in a relaxed manner.
  • the various configurations 602 may include a configuration 612 with no DRX, configuration 622 with DRX cycle ⁇ 320 ms, and/or a configuration 632 with DRX cycle > 320 ms.
  • FIG. 6 A illustrates in-sync and out-of-sync measurement periods.
  • FIG. 6A illustrates out-of-sync measurement period (TEvaiuate_out_ssB) 624 and in-sync measurement period (TEvaiuatejn SSB) 626.
  • the out-of-sync measurement period 624 and/or the in-sync measurement period (TEvaiuatejn SSB) 626 may be based on at least relaxation factors, Rout or Rin (in addition to TSSB and/or TDRX), if RLM relaxation is configured.
  • FIG. 6B illustrates relaxation of RLM measurements 650, according to an example implementation.
  • FIG. 6B illustrates configuration of measurement periods which may include, for example, out-of-sync measurement period (TEvaiuate_out_ssB ) 654 and in-sync measurement period (TEvaiuate j n SSB) 656 for various configurations 652 for performing RLM/BFD measurements in a relaxed manner.
  • the various configurations 652 may include a configuration 662 with no DRX, configuration 672 with DRX cycle ⁇ 320 ms, and/or a configuration 682 with DRX cycle > 320 ms.
  • FIG. 6B illustrates in-sync and out-of-sync measurement periods.
  • FIG. 6B illustrates out-of-sync measurement period (TEvaiuate_out_ssB) 674 and in-sync measurement period (TEvaiuatejn SSB) 676.
  • the out-of-sync measurement period 674 and/or the in-sync measurement period (TEvaiuatejn SSB) 676 may be based on at least relaxed measurement period Rperiod (in addition to TSSB and/or TDRX), if RLM relaxation is configured.
  • the evaluation period is kept unchanged (not relaxed) while the number of samples used for evaluating the Q out (and/or Q m ) in the RLM procedure is lowered.
  • the default values for R out and Ri n may be set to 1, for example, if not configured or used by the network, for instance in legacy networks and legacy UE).
  • the values of Rout and Rin are not the same in each DRX state.
  • different Rout and Rin values may be applied as function of the DRX cycle (not state), for example, larger values for smaller DRX cycles and vice-versa.
  • different scaling factors may be applied to measurements of RLM-RS resources that belong to the serving beam (RSB) as compared to a non-serving beam (RNSB).
  • RNSB can be set to a larger value than RSB, which results in relaxing the non-serving beam measurements to a larger extent.
  • Example 1 A method of communications, comprising: determining, by a user equipment (UE), that a first measurement period is shorter than a second measurement period or a first condition is satisfied; determining, by the UE, in response to determining that the first measurement period is shorter than the second measurement period or the first condition is satisfied, a modified first measurement period based at least on a third measurement period or a scaling of the first measurement period, respectively; and performing, by the UE, measurements based at least on the modified first measurement period.
  • UE user equipment
  • Example 2 The method of Example 1, wherein first measurement period comprises an in-sync measurement period or an out-of-sync measurement period.
  • Example 3 The method of any of Examples 1-2, further comprising: receiving a first configuration and/or a second configuration from the network node.
  • Example 4 The method of any of Examples 1-3, wherein the first configuration indicates the first measurement period and the second configuration indicates the second measurement period.
  • Example 5 The method of any of Examples 1-4, wherein the first measurement period is a radio link monitoring (RLM) measurement period and the second measurement period is a radio resource management (RRM) period.
  • RLM radio link monitoring
  • RRM radio resource management
  • Example 6 The method of any of Examples 1-5, wherein the measurements comprise radio link monitoring (RLM) or beam failure detection (BFD) measurements.
  • RLM radio link monitoring
  • BFD beam failure detection
  • Example 7 The method of any of Examples 1-6, wherein the first configuration comprises a radio link monitoring (RLM) reference signal (RLM-RS) resource configuration and the second configuration comprises a radio resource management (RRM) measurement configuration.
  • RLM radio link monitoring
  • RRM radio resource management
  • Example 8 The method of any of Examples 1-7, wherein the RLM-RS resource configuration further comprises a channel state information reference signal (CSI-RS) resource configuration or a synchronization signal block (SSB) resource configuration.
  • CSI-RS channel state information reference signal
  • SSB synchronization signal block
  • Example 9 The method of any of Examples 1-8, wherein the RLM-RS resource configuration further comprises criteria to allow the modifying of the first measurement period.
  • Example 10 The method of Examples 1-9, wherein the determining that the first measurement period is shorter than the second measurement period is based at least on the first configuration and the second configuration received from the network node.
  • Example 11 The method of Examples 1-10, wherein the modified first time period is determined based at least on a value of discontinuous reception (DRX) cycle or wherein the modified first time period is determined when a short DRX or short DRX cycles with long DRX is configured.
  • DRX discontinuous reception
  • Example 12 The method of any of Examples 1-11, wherein the scaling of the first measurement period is based on a value of discontinuous reception (DRX) cycle for the UE.
  • DRX discontinuous reception
  • Example 13 The method of any of Examples 1-12, wherein the third measurement period is based at least on a synchronization signal block (SSB) based measurement timing configuration (SMTC) period.
  • SSB synchronization signal block
  • SMTC measurement timing configuration
  • Example 14 The method of any of Examples 1-12, wherein the third measurement period is an RRM measurement period.
  • Example 15 The method of any of Examples 1-12, wherein the first condition comprises: determining whether radio link quality is good, or when the UE is configured with short discontinuous reception (DRX) or short DRX cycles with long discontinuous reception (DRX), or a combination thereof.
  • DRX short discontinuous reception
  • DRX short DRX cycles with long discontinuous reception
  • Example 16 The method of any of Examples 1-12 and 15, wherein the performing of the scaling of the first measurement period includes: scaling the in-sync measurement period of the first measurement period by a first scaling factor; and/or and scaling the out-of-sync measurement period of the first measurement period by a second scaling factor.
  • Example 17 The method of any of Examples 1-12 and 15 -16, wherein the scaling is performed for CSI-RS or SSB based RLM/BFD measurements.
  • Example 18 The method of any of Examples 1-12, wherein the performing of the measurements based at least on the modified first measurement period is based on whether one or more second conditions are satisfied.
  • Example 19 The method of any of Examples 1-12 and 18, wherein the one or more second conditions comprise: difference in signal levels between a serving cell and a best neighbor cell above a first threshold; absolute signal level of the serving cell above a second threshold; and a variation in signal level over time below a third threshold.
  • Example 20 The method of any of Examples 1-19, wherein the UE is in a radio resource control (RRC) CONNECTED mode.
  • RRC radio resource control
  • Example 21 The method of any of Examples 1-20, wherein the network node is a gNB.
  • Example 22 The method of any of Examples 1-21, wherein the performing includes performing the measurements on a reduced number of RLM-RS resources.
  • Example 23 A method of communications, comprising: transmitting, by a network node, a radio link monitoring (RLM) reference signal (RLM-RS) resource configuration and a radio resource management (RRM) measurement configuration to a user equipment (UE), wherein the RLM-RS resource configuration includes criteria to allow the modifying of a radio link monitoring or beam failure detection measurement period by the UE.
  • RLM radio link monitoring
  • RRM radio resource management
  • Example 24 The method of Example 23, wherein the RLM-RS resource configuration comprises a channel state information reference signal (CSI-RS) resource configuration or a synchronization signal block (SSB) resource configuration.
  • CSI-RS channel state information reference signal
  • SSB synchronization signal block
  • Example 25 The method of any of Examples 23-24, wherein the RRM measurement configuration comprises a synchronization signal block (SSB) based measurement timing configuration (SMTC) period that is configured for the UE to be longer than an SSB transmission period.
  • SSB synchronization signal block
  • SMTC measurement timing configuration
  • Example 26 An apparatus comprising means for performing the method of any of Examples 1-25.
  • Example 27 A non-transitory computer-readable storage medium comprising instructions stored thereon that, when executed by at least one processor, are configured to cause a computing system to perform the method of any of Examples 1-25.
  • Example 28 An apparatus comprising: at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform the method of any of Examples 1-25.
  • FIG. 7 is a block diagram of a wireless station (e.g., user equipment (UE)/user device or AP/gNB/MgNB/SgNB) 700 according to an example implementation.
  • the wireless station 700 may include, for example, one or more RF (radio frequency) or wireless transceivers 702A, 702B, where each wireless transceiver includes a transmitter to transmit signals and a receiver to receive signals.
  • the wireless station also includes a processor or control unit/entity (controller) 704/706 to execute instructions or software and control transmission and receptions of signals, and a memory 708 to store data and/or instructions.
  • Processor 704 may also make decisions or determinations, generate frames, packets or messages for transmission, decode received frames or messages for further processing, and other tasks or functions described herein.
  • Processor 704 which may be a baseband processor, for example, may generate messages, packets, frames or other signals for transmission via wireless transceiver 702 (702A or 702B).
  • Processor 704 may control transmission of signals or messages over a wireless network, and may control the reception of signals or messages, etc., via a wireless network (e.g., after being down-converted by wireless transceiver 702, for example).
  • Processor 704 may be programmable and capable of executing software or other instructions stored in memory or on other computer media to perform the various tasks and functions described above, such as one or more of the tasks or methods described above.
  • Processor 704 may be (or may include), for example, hardware, programmable logic, a programmable processor that executes software or firmware, and/or any combination of these.
  • processor 704 and transceiver 702 together may be considered as a wireless transmitter/receiver system, for example.
  • a controller 706 may execute software and instructions, and may provide overall control for the station 700, and may provide control for other systems not shown in FIG. 7, such as controlling input/output devices (e.g., display, keypad), and/or may execute software for one or more applications that may be provided on wireless station 700, such as, for example, an email program, audio/video applications, a word processor, a Voice over IP application, or other application or software.
  • a storage medium may be provided that includes stored instructions, which when executed by a controller or processor may result in the processor 704, or other controller or processor, performing one or more of the functions or tasks described above.
  • Processor 704 may control the RF or wireless transceiver 702A or 702B to receive, send, broadcast or transmit signals or data.
  • 5G Another example of a suitable communications system is the 5G concept. It is assumed that network architecture in 5G will be quite similar to that of the LTE-advanced. 5G is likely to use multiple input - multiple output (MIMO) antennas, many more base stations or nodes than the LTE (a so-called small cell concept), including macro sites operating in co-operation with smaller stations and perhaps also employing a variety of radio technologies for better coverage and enhanced data rates.
  • MIMO multiple input - multiple output
  • NFV network functions virtualization
  • a virtualized network function may comprise one or more virtual machines running computer program codes using standard or general type servers instead of customized hardware. Cloud computing or data storage may also be utilized.
  • radio communications this may mean node operations may be carried out, at least partly, in a server, host or node operationally coupled to a remote radio head. It is also possible that node operations will be distributed among a plurality of servers, nodes or hosts. It should also be understood that the distribution of labor between core network operations and base station operations may differ from that of the LTE or even be non-existent.
  • Implementations of the various techniques described herein may be implemented in digital electronic circuitry, or in computer hardware, firmware, software, or in combinations of them. Implementations may be implemented as a computer program product, i.e., a computer program tangibly embodied in an information carrier, e.g., in a machine-readable storage device or in a propagated signal, for execution by, or to control the operation of, a data processing apparatus, e.g., a programmable processor, a computer, or multiple computers. Implementations may also be provided on a computer readable medium or computer readable storage medium, which may be a non-transitory medium.
  • Implementations of the various techniques may also include implementations provided via transitory signals or media, and/or programs and/or software implementations that are downloadable via the Internet or other network(s), either wired networks and/or wireless networks.
  • implementations may be provided via machine type communications (MTC), and also via an Internet of Things (IOT).
  • MTC machine type communications
  • IOT Internet of Things
  • the computer program may be in source code form, object code form, or in some intermediate form, and it may be stored in some sort of carrier, distribution medium, or computer readable medium, which may be any entity or device capable of carrying the program.
  • carrier include a record medium, computer memory, read-only memory, photoelectrical and/or electrical carrier signal, telecommunications signal, and software distribution package, for example.
  • the computer program may be executed in a single electronic digital computer or it may be distributed amongst a number of computers.
  • implementations of the various techniques described herein may use a cyber-physical system (CPS) (a system of collaborating computational elements controlling physical entities).
  • CPS may enable the implementation and exploitation of massive amounts of interconnected ICT devices (sensors, actuators, processors microcontrollers, etc embedded in physical objects at different locations.
  • ICT devices sensors, actuators, processors microcontrollers, etc.
  • Mobile cyber physical systems in which the physical system in question has inherent mobility, are a subcategory of cyber-physical systems. Examples of mobile physical systems include mobile robotics and electronics transported by humans or animals. The rise in popularity of smartphones has increased interest in the area of mobile cyber-physical systems. Therefore, various implementations of techniques described herein may be provided via one or more of these technologies.
  • a computer program such as the computer program(s) described above, can be written in any form of programming language, including compiled or interpreted languages, and can be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit or part of it suitable for use in a computing environment.
  • a computer program can be deployed to be executed on one computer or on multiple computers at one site or distributed across multiple sites and interconnected by a communication network.
  • Method steps may be performed by one or more programmable processors executing a computer program or computer program portions to perform functions by operating on input data and generating output. Method steps also may be performed by, and an apparatus may be implemented as, special purpose logic circuitry, e.g., an FPGA (field programmable gate array) or an ASIC (application specific integrated circuit).
  • FPGA field programmable gate array
  • ASIC application specific integrated circuit
  • processors suitable for the execution of a computer program include, by way of example, both general and special purpose microprocessors, and any one or more processors of any kind of digital computer, chip or chipset.
  • a processor will receive instructions and data from a read only memory or a random access memory or both.
  • Elements of a computer may include at least one processor for executing instructions and one or more memory devices for storing instructions and data.
  • a computer also may include, or be operatively coupled to receive data from or transfer data to, or both, one or more mass storage devices for storing data, e.g., magnetic, magneto optical disks, or optical disks.
  • Information carriers suitable for embodying computer program instructions and data include all forms of non volatile memory, including by way of example semiconductor memory devices, e.g., EPROM, EEPROM, and flash memory devices; magnetic disks, e.g., internal hard disks or removable disks; magneto optical disks; and CD ROM and DVD- ROM disks.
  • semiconductor memory devices e.g., EPROM, EEPROM, and flash memory devices
  • magnetic disks e.g., internal hard disks or removable disks
  • magneto optical disks e.g., CD ROM and DVD- ROM disks.
  • the processor and the memory may be supplemented by, or incorporated in, special purpose logic circuitry.

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Abstract

La présente invention concerne un procédé, un appareil et un support de stockage lisible par ordinateur permettant un relâchement de mesures de surveillance de liaison radioélectrique. Dans un mode de réalisation donné à titre d'exemple, le procédé peut comprendre le fait de déterminer, par un équipement d'utilisateur, qu'une première période de mesure est plus courte qu'une deuxième période de mesure ou qu'une première condition est satisfaite, la détermination, en réponse au fait de déterminer que la première période de mesure est plus courte que la deuxième période de mesure ou que la première condition est satisfaite, d'une première période de mesure modifiée sur la base d'au moins une troisième période de mesure ou d'une variation de la première période de mesure, respectivement, et la réalisation de mesures sur la base d'au moins la première période de mesure modifiée. Dans un autre mode de réalisation donné à titre d'exemple, le procédé peut comprendre la transmission à un équipement d'utilisateur (UE), par un nœud de réseau, d'une configuration de ressource de signal de référence de surveillance de liaison radioélectrique (RLM) (RLM-RS) et d'une configuration de mesure de gestion de ressources radioélectriques (RRM). La configuration de ressource de RLM-RS peut comprendre des critères pour permettre la modification par un UE d'une période de mesure de surveillance de liaison radioélectrique ou de détection de défaillance de faisceau.
PCT/EP2020/066465 2020-06-15 2020-06-15 Commande de relâchement de mesures de surveillance de liaison radioélectrique WO2021254590A1 (fr)

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