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WO2024229782A1 - Rapport d'état de relâchement rlm ou bfd - Google Patents

Rapport d'état de relâchement rlm ou bfd Download PDF

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Publication number
WO2024229782A1
WO2024229782A1 PCT/CN2023/093410 CN2023093410W WO2024229782A1 WO 2024229782 A1 WO2024229782 A1 WO 2024229782A1 CN 2023093410 W CN2023093410 W CN 2023093410W WO 2024229782 A1 WO2024229782 A1 WO 2024229782A1
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WO
WIPO (PCT)
Prior art keywords
terminal device
condition
relaxation
criterion
bfd
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2023/093410
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English (en)
Inventor
Jussi-Pekka Koskinen
Samuli Heikki TURTINEN
Chunli Wu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Shanghai Bell Co Ltd
Nokia Solutions and Networks Oy
Nokia Technologies Oy
Original Assignee
Nokia Shanghai Bell Co Ltd
Nokia Solutions and Networks Oy
Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Shanghai Bell Co Ltd, Nokia Solutions and Networks Oy, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co Ltd
Priority to PCT/CN2023/093410 priority Critical patent/WO2024229782A1/fr
Priority to CN202380097960.1A priority patent/CN121058278A/zh
Publication of WO2024229782A1 publication Critical patent/WO2024229782A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • 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

  • Example embodiments of the present disclosure generally relate to the field of telecommunication and in particular, to a terminal device, a network device, methods, apparatuses and a computer readable storage medium for radio link monitoring (RLM) or beam failure detection (BFD) relaxation state reporting.
  • RLM radio link monitoring
  • BFD beam failure detection
  • the third generation partnership project (3GPP) has introduced the RLM/BFD relaxation in release 17 (Rel-17) .
  • a terminal device such as user equipment (UE) , may perform the RLM/BFD relaxation. Power saving may be achieved at the UE by relaxing measurements for RLM/BFD.
  • the current specification has defined that the UE is no longer allowed to relax RLM/BFD measurements if no discontinuous reception (DRX) is used or DRX cycle is longer than 80 ms. In case the UE is not allowed to relax anymore, the report of the relaxation status may be terminated or may include false information.
  • DRX discontinuous reception
  • example embodiments of the present disclosure provide a solution for RLM/BFD relaxation state reporting.
  • a terminal device comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the terminal device at least to: based on a determination that a criterion of a condition is fulfilled, change a relaxation status of a radio link monitoring (RLM) or a beam failure detection (BFD) ; and transmit, to a network device, an indication associated with the condition.
  • RLM radio link monitoring
  • BFD beam failure detection
  • a network device comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the network device at least to: receive, from a terminal device, an indication associated with a condition, the condition being used for determining whether to change a relaxation status of a radio link monitoring (RLM) or a beam failure detection (BFD) ; and determine that a criterion of the condition has been fulfilled and the relaxation status of the RLM or the BFD has been changed based on the indication.
  • RLM radio link monitoring
  • BFD beam failure detection
  • a method performed by a terminal device comprises: based on a determination that a criterion of a condition is fulfilled, changing, at a terminal device, a relaxation status of a radio link monitoring (RLM) or a beam failure detection (BFD) ; and transmitting, to a network device, an indication associated with the condition.
  • RLM radio link monitoring
  • BFD beam failure detection
  • a method performed by a network device comprises: receiving, at a network device from a terminal device, an indication associated with a condition, the condition being used for determining whether to change a relaxation status of a radio link monitoring (RLM) or a beam failure detection (BFD) ; and determining that a criterion of the condition has been fulfilled and the relaxation status of the RLM or the BFD has been changed based on the indication.
  • RLM radio link monitoring
  • BFD beam failure detection
  • an apparatus comprises: means for based on a determination that a criterion of a condition is fulfilled, changing, at a terminal device, a relaxation status of a radio link monitoring (RLM) or a beam failure detection (BFD) ; and means for transmitting, to a network device, an indication associated with the condition.
  • RLM radio link monitoring
  • BFD beam failure detection
  • an apparatus comprising: means for receiving, at a network device from a terminal device, an indication associated with a condition, the condition being used for determining whether to change a relaxation status of a radio link monitoring (RLM) or a beam failure detection (BFD) ; and means for determining that a criterion of the condition has been fulfilled and the relaxation status of the RLM or the BFD has been changed based on the indication.
  • RLM radio link monitoring
  • BFD beam failure detection
  • a terminal device comprising: changing circuitry configured to based on a determination that a criterion of a condition is fulfilled, change a relaxation status of a radio link monitoring (RLM) or a beam failure detection (BFD) ; and transmitting circuitry configured to transmit, to a network device, an indication associated with the condition.
  • RLM radio link monitoring
  • BFD beam failure detection
  • a network device comprising: receiving circuitry configured to receive, from a terminal device, an indication associated with a condition, the condition being used for determining whether to change a relaxation status of a radio link monitoring (RLM) or a beam failure detection (BFD) ; and determining circuitry configured to determine that a criterion of the condition has been fulfilled and the relaxation status of the RLM or the BFD has been changed based on the indication.
  • RLM radio link monitoring
  • BFD beam failure detection
  • a non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the method in the third or fourth aspect.
  • a computer program comprising instructions, which, when executed by an apparatus, cause the apparatus at least to perform the method in the third or fourth aspect.
  • FIG. 1 illustrates an example of a network environment in which some example embodiments of the present disclosure may be implemented
  • FIG. 2 illustrates an example of a process flow in accordance with some example embodiments of the present disclosure
  • FIG. 3 illustrates a flowchart of a method implemented at a terminal device in accordance with some example embodiments of the present disclosure
  • FIG. 4 illustrates a flowchart of a method implemented at a network device in accordance with some example embodiments of the present disclosure
  • FIG. 5 illustrates a simplified block diagram of a device that is suitable for implementing some example embodiments of the present disclosure.
  • FIG. 6 illustrates a block diagram of an example of a computer readable medium in accordance with some example embodiments of the present disclosure.
  • references in the present disclosure to “one embodiment, ” “an embodiment, ” “an example embodiment, ” and the like indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
  • first and second etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments.
  • the term “and/or” includes any and all combinations of one or more of the listed terms.
  • circuitry may refer to one or more or all of the following:
  • circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.
  • the term “communication network” refers to a network following any suitable communication standards, such as Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , New Radio (NR) , Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , Narrow Band Internet of Things (NB-IoT) and so on.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • NR New Radio
  • WCDMA Wideband Code Division Multiple Access
  • HSPA High-Speed Packet Access
  • NB-IoT Narrow Band Internet of Things
  • the communications in the communication network may be performed according to any suitable generation communication protocols, including, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) , the sixth generation (6G) communication protocols, and/or any other protocols either currently known or to be developed in the future.
  • suitable generation communication protocols including, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) , the sixth generation (6G) communication protocols, and/or any other protocols either currently known or to be developed in the future.
  • Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to
  • the term “network device” refers to a node in a communication network via which a terminal device accesses the network and receives services therefrom.
  • the network device may refer to a base station (BS) or an access point (AP) , for example, a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a new radio (NR) NB (also referred to as a gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , a remote radio head (RRH) , an integrated access and backhaul (IAB) node, a relay, a low power node such as a femto, a pico, and so forth, depending on the applied terminology and technology.
  • BS base station
  • AP access point
  • NodeB or NB node B
  • eNodeB or eNB evolved NodeB
  • NR new radio
  • RRU Remote Radio Unit
  • terminal device refers to any end device that may be capable of wireless communication.
  • a terminal device may also be referred to as a communication device, user equipment (UE) , a Subscriber Station (SS) , a Portable Subscriber Station, a Mobile Station (MS) , or an Access Terminal (AT) .
  • UE user equipment
  • SS Subscriber Station
  • MS Mobile Station
  • AT Access Terminal
  • the terminal device may include, but not limited to, a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones, a tablet, a wearable terminal device, a personal digital assistant (PDA) , portable computers, desktop computer, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , USB dongles, smart devices, wireless customer-premises equipment (CPE) , an Internet of Things (loT) device, a machine type communication (MTC) device, a watch or other wearable, a head-mounted display (HMD) , a vehicle, a drone, a medical device and applications (e.g., remote surgery) , an industrial device and applications (e.g., a robot and/or other wireless devices operating in an industrial and/or an automated processing chain contexts) , a consumer
  • RLM/BFD may refer to “RLM and BFD” , “RLM or BFD” , or “RLM and/or BFD” depending on the discussed scenario.
  • RLM/BFD relaxation was introduced in Rel-17.
  • a UE determines whether it is in low mobility state and/or whether its serving cell radio link quality is better than a threshold.
  • the UE is allowed to perform RLM/BFD relaxation when relaxed measurement criterion for low mobility and/or for good serving cell quality is met. If configured to do so, the UE shall trigger reporting of its RLM/BFD relaxation status through UE assistance information (UAI) , if the UE changes its respective RLM/BFD relaxation status while meeting the UE minimum requirements specified in the 3GPP specification.
  • UAI UE assistance information
  • the configuration for low mobility and good serving cell quality criterion is provided through dedicated radio resource control (RRC) signalling.
  • RLM/BFD relaxation may be enabled/disabled separately through RRC configuration.
  • RLM relaxation may be enabled/disabled on per Cell Group basis
  • BFD relaxation may be enabled/disabled on per serving cell basis.
  • the current specification also defined that the UE is no longer allowed to relax RLM measurements and apply the relaxed radio link monitoring provided that at least one of the following conditions is met:
  • the UE sends out-of sync indications to the higher layers.
  • the timer T310 is running.
  • DRX cycle is longer than 80ms.
  • the current specification also defined that the UE is no longer allowed to relax BFD measurements and apply the relaxed link recovery procedures provided that at least one of the following conditions is met:
  • DRX cycle is longer than 80ms.
  • the UE is no longer allowed to relax RLM/BFD measurements if no DRX is used or DRX cycle is longer than 80 ms, while whether DRX is used may be determined based on, e.g., information shown in the following text box:
  • the UE may frequently change its relaxation status. If the UE reports its status change every time, the power consumption will be increased. In some cases, the UE may determine to report its status change due to low mobility or good serving cell quality, if the DRX state changes before the reporting, the UE may report false/old information to the network. Therefore, the reporting of RLM/BFD relaxation state needs to be further studied.
  • Example embodiments of the present disclosure provide a solution for RLM/BFD relaxation state reporting.
  • a terminal device may change its RLM/BFD relaxation status if a criterion of a condition is fulfilled.
  • the terminal device may further transmit an indication associated with the condition to a network device to, so that the network device may be aware of the reason why the terminal device changes its RLM/BFD relaxation status.
  • FIG. 1 illustrates an example of a network environment 100 in which some example embodiments of the present disclosure may be implemented.
  • the environment 100 which may be a part of a communication network, comprises a terminal device 110 and a network device 120.
  • the network environment 100 may also be called as a network system, a communication environment, a communication network, a communication system, or the like, the present disclosure does not limit this aspect.
  • the environment 100 may comprise any suitable number of devices and cells.
  • the network device 120 can provide services to the terminal device 110, and the network device 120 and the terminal device 110 may communicate data and control information with each other.
  • the network device 120 and the terminal device 110 may communicate with direct links/channels.
  • a link from the network device 120 to the terminal device 110 is referred to as a downlink (DL)
  • a link from the terminal device 110 to the network device 120 is referred to as an uplink (UL)
  • the network device 120 is a transmitting (TX) device (or a transmitter) and the terminal device 110 is a receiving (RX) device (or a receiver)
  • the terminal device 110 is a transmitting TX device (or a transmitter) and the network device 120 is a RX device (or a receiver) .
  • the network device 120 may provide one or more serving cells. In some embodiments, the network device 120 can provide multiple cells.
  • Communications in the network environment 100 may be implemented according to any proper communication protocol (s) , comprising, but not limited to, cellular communication protocols of the first generation (1G) , the second generation (2G) , the third generation (3G) , the fourth generation (4G) , the fifth generation (1G) and the sixth generation (6G) and on the like, wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and/or any other protocols currently known or to be developed in the future.
  • s cellular communication protocols of the first generation (1G) , the second generation (2G) , the third generation (3G) , the fourth generation (4G) , the fifth generation (1G) and the sixth generation (6G) and on the like
  • wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and/or any other protocols currently known or to be developed in the future.
  • the communication may utilize any proper wireless communication technology, comprising but not limited to: Code Division Multiple Access (CDMA) , Frequency Division Multiple Access (FDMA) , Time Division Multiple Access (TDMA) , Frequency Division Duplex (FDD) , Time Division Duplex (TDD) , Multiple-Input Multiple-Output (MIMO) , Orthogonal Frequency Division Multiple (OFDM) , Discrete Fourier Transform spread OFDM (DFT-s-OFDM) and/or any other technologies currently known or to be developed in the future.
  • CDMA Code Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • MIMO Multiple-Input Multiple-Output
  • OFDM Orthogonal Frequency Division Multiple
  • DFT-s-OFDM Discrete Fourier Transform spread OFDM
  • the numbers of devices i.e., the terminal device 110 and the network device 120
  • the environment 100 may include any suitable numbers of devices adapted for implementing embodiments of the present disclosure.
  • FIG. 1 depicts the terminal device 110 as a mobile phone; the terminal device 110 may be any type of user equipment.
  • FIG. 2 illustrates an example of a process flow 200 in accordance with some example embodiments of the present disclosure.
  • the process flow 200 will be described with reference to FIG. 1.
  • the process flow 200 involves the terminal device 110 and the network device 120. It would be appreciated that although the process flow 200 has been described in the network environment 100 of FIG. 1, this process flow may be likewise applied to other communication scenarios.
  • the terminal device 110 determines 210 that a criterion of a condition for changing a RLM/BFD relaxation status is fulfilled.
  • a criterion is fulfilled may also be referred to as the criterion is satisfied or met, the present disclosure does not limit this aspect.
  • the criterion of the condition may be configured by the network device 120.
  • the network device 120 may transmit, to the terminal device 110, a configuration indicating the criterion of the condition, e.g., the configuration may be carried in RRC signalling.
  • the terminal device 110 may receive the configuration. Accordingly, the terminal device 110 may determine whether a criterion is fulfilled based on the configuration.
  • the terminal device 110 changes 220 its RLM/BFD relaxation status in response to the determination that the criterion of the condition is fulfilled.
  • the RLM/BFD relaxation status may be “relaxation” when the terminal device 110 is performing the RLM/BFD relaxation, i.e., is relaxing the RLM/BFD measurements.
  • the RLM/BFD relaxation status may be “non-relaxation” when the terminal device 110 is not performing the RLM/BFD relaxation, i.e., is not relaxing the RLM/BFD measurements.
  • the criterion of the condition may comprise one or more of: a first criterion or a second criterion.
  • the first criterion may be associated with a status changing from non-relaxation to relaxation
  • the second criterion may be associated with a status changing from relaxation to non-relaxation.
  • a fulfillment of the first criterion may trigger the terminal device 110 to change its RLM/BFD relaxation status from non-relaxation to relaxation
  • a fulfillment of the second criterion may trigger the terminal device 110 to change its RLM/BFD relaxation status from relaxation to non-relaxation.
  • the terminal device 110 may determine whether the first criterion is fulfilled when the terminal device 110 is not relaxing the RLM/BFD measurements. In some examples, if the first criterion is fulfilled, then the terminal device 110 may change its RLM/BFD relaxation status, i.e., start relaxing the RLM/BFD measurements. In other words, in case the first criterion is fulfilled, the terminal device 110 may perform (start performing) the RLM/BFD relaxation.
  • the terminal device 110 may determine whether the second criterion is fulfilled when the terminal device 110 is relaxing the RLM/BFD measurements. In some examples, if the second criterion is fulfilled, then the terminal device 110 may change its RLM/BFD relaxation status, i.e., stop relaxing the RLM/BFD measurements. In other words, in case the second criterion is fulfilled, the terminal device 110 may stop performing the RLM/BFD relaxation.
  • the first criterion may include one or more of: a relaxed measurement criterion for the terminal device with a low mobility in RRC connected state (RRC_CONNECTED) , a relaxed measurement criterion for good serving cell quality, or DRX is used and a DRX cycle is not longer than a predefined value.
  • the predefined value may be 80 ms. It is to be understood that the example of the predefined value is not limited in the present disclosure, for example, it may be another value, such as 60 ms, 120 ms, or the like.
  • the terminal device 110 may determine its current measurement result, and determine whether a difference of a reference measurement result and the current measurement result is smaller than a first threshold. If the difference is smaller than the first threshold, then the mobility is low.
  • the current measurement result may be a layer 3 (L3) reference signal received power (RSRP) measurement, which may be represented as SS-RSRP.
  • the reference measurement result may be a reference L3 RSRP measurement, which may be represented as SS-RSRP Ref .
  • the first threshold may be preconfigured by the network device 120 or may be predefined, which may be represented as S SearchDeltaP-Connected .
  • the relaxed measurement criterion for UE with low mobility in RRC_CONNECTED is fulfilled when: (SS-RSRP Ref –SS-RSRP) ⁇ S SearchDeltaP-Connected .
  • the terminal device 110 may determine a downlink radio link quality of a serving cell, and further determines whether the downlink radio link quality is better than a second threshold.
  • the second threshold may be represented as Q in +XdB, where Q in is preconfigured or predefined threshold and X is an offset.
  • the relaxed measurement criterion of good serving cell quality for RLM is fulfilled when the downlink radio link quality on the configured RLM-RS resource is evaluated to be better than the threshold Q in +XdB.
  • the relaxed measurement criterion of good serving cell quality for BFD is fulfilled when the downlink radio link quality on the configured BFD-RS resource is evaluated to be better than the threshold Q in +XdB.
  • the second criterion may include one or more of: a relaxed measurement criterion for the terminal device with a high mobility in an RRC connected state (RRC_CONNECTED) , a relaxed measurement criterion for bad serving cell quality, DRX is not used, or a DRX cycle is longer than a predefined value.
  • RRC_CONNECTED RRC connected state
  • DRX bad serving cell quality
  • DRX cycle is longer than a predefined value.
  • the second criterion is fulfilled may be regarded as the first criterion is not fulfilled.
  • the condition may comprise a mobility of the terminal device 110 and/or a quality of a serving cell of the terminal device 110. In some example embodiments, the condition may comprise the DRX state.
  • the terminal device 110 transmits 230 an indication 232 associated with the condition to the network device 120.
  • the indication 232 may be transmitted together with measurement relaxation state information, such as rlm-MeasRelaxationState and/or bfd-MeasRelaxationState.
  • the indication 232 may be transmitted independently from (or separate from) the measurement relaxation state information, e.g., the indication 232 is transmitted in addition to rlm-MeasRelaxationState and/or bfd-MeasRelaxationState.
  • the indication 232 may be transmitted in a UAI.
  • the terminal device 110 may report the indication 232 by using a UAI.
  • the indication 232 may indicate information about the relaxation status.
  • the indication 232 may include information on relaxation.
  • the information on relaxation may indicate “relaxation” or “non-relaxation” .
  • the network device 120 can be aware of the new relaxation status.
  • the indication 232 may indicate a reason of the RLM/BFD relaxation status changing, in other words, the indication 232 may indicate why the terminal device 110 changes its RLM/BFD relaxation status.
  • the indication 232 may indicate a DRX state if the criterion of the condition is related with the DRX.
  • the indication 232 may include a specific value to indicate “DRX state” . Since the network device 120 has knowledge of the DRX, it may know whether the terminal device 110 is changing to relaxation or changing to non-relaxation.
  • the indication 232 may indicate a change of the condition.
  • the indication 232 may indicate a change in the fulfillment of the RLM/BFD relaxation criterion, such as the relaxed measurement criterion for low mobility, and/or relaxed measurement criterion for good serving cell quality.
  • the terminal device 110 may obtain a first L3 RSRP measurement before changing the RLM/BFD relaxation status, and determine a second L3 RSRP measurement after changing the RLM/BFD relaxation status, where the indication 232 may indicate a difference of the first L3 RSRP measurement and the second L3 RSRP measurement.
  • the terminal device 110 may obtain a first downlink radio link quality of the serving cell before changing the RLM/BFD relaxation status, and determine a second downlink radio link quality of the serving cell after changing the RLM/BFD relaxation status, where the indication 232 may indicate a difference of the first downlink radio link quality of the serving cell and the second downlink radio link quality of the serving cell.
  • the indication 232 may indicate which criterion is fulfilled, and/or which criterion is not fulfilled anymore. For example, the indication 232 may indicate that the relaxed measurement criterion for UE with low mobility in RRC_CONNECTED is not fulfilled anymore. For example, the indication 232 may indicate that the relaxed measurement criterion of good serving cell quality is not fulfilled anymore.
  • the reporting of the indication 232 may be triggered by changing of the RLM/BFD relaxation status, or triggered by fulfillment of the criterion.
  • the terminal device 110 may further start at least one prohibit timer.
  • the terminal device 110 may start a specific prohibit timer associated with the specific condition, depending on the fulfilled criterion. For example, if the relaxed measurement criterion for UE with low mobility in RRC_CONNECTED is fulfilled, a first prohibit timer associated with low mobility may be started. For example, if the relaxed measurement criterion of good serving cell quality is fulfilled, a second prohibit timer associated with good serving cell quality may be started. For example, if the criterion of DRX is used and DRX cycle is not longer than a predefined value is fulfilled, a third prohibit timer associated with DRX state may be started.
  • more than one prohibit timer may be started. If a further criterion is fulfilled and the associated prohibit timer is running, then the reporting may be terminated. For example, assume that the DRX state is changed and the RLM/BFD relaxation status is further changed, then there is no further indication transmitted by the terminal device 110 if the third prohibit timer is running. However, a running prohibit timer will not prevent a reporting associated with other conditions. For example, assume that the DRX state is changed and the RLM/BFD relaxation status is further changed, then there is a further indication transmitted by the terminal device 110 if the third prohibit timer is not running, even if the first prohibit timer and/or the second prohibit timer is running. In other words, the reporting associated with DRX state is transmitted regardless of the running first prohibit timer and/or second prohibit timer.
  • a specific prohibit timer may be associated with more than one condition.
  • the first prohibit timer and the second prohibit timer may be implemented as a same prohibit timer.
  • the first prohibit timer, the second prohibit timer, and the third prohibit timer may be implemented as a same prohibit timer, e.g., there is only one prohibit timer at the terminal device 110. For example, if the prohibit timer is running, there will be no reporting transmitted by the terminal device 110, regardless of the criterion. For example, during a time period that the prohibit timer is running, the terminal device 110 may determine that a criterion is fulfilled and its RLM/BFD relaxation status is changed, but no further indication will be transmitted to the network device 120. As such, overhead may be reduced and the power saving may be guaranteed.
  • the network device 120 receives 234 the indication 232. Accordingly, the network device 120 determines 240 that a criterion of the condition has been fulfilled and the RLM/BFD relaxation status has been changed.
  • the network device 120 may determine the RLM/BFD relaxation statues of the terminal device 110 based on the indication 232. In some example embodiments, the network device 120 may determine the reason of changing the RLM/BFD relaxation statues (why the RLM/BFD relaxation statues is changed) based on the indication 232.
  • the network device 120 can know the reason why the terminal device 110 is relaxing RLM/BFD measurements, or the reason why the terminal device 110 is not relaxing RLM/BFD measurements.
  • the indication 232 may indicate DRX state. Since the network device 120 has knowledge of DRX, for example, no DRX is used, then the network device 120 may determine that the terminal device 110 is not relaxing RLM/BFD measurements because no DRX is used.
  • a terminal device may change its RLM/BFD relaxation status if a criterion of a condition is fulfilled.
  • the terminal device may further transmit an indication associated with the condition to a network device, so that the network device may be aware of the reason why the terminal device changes its RLM/BFD relaxation status. Accordingly, the network device may know why the terminal device is relaxing RLM/BFD measurements or why the terminal device is not relaxing RLM/BFD measurements.
  • FIG. 3 illustrates a flowchart of a method 300 implemented at a terminal device in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the method 300 will be described from the perspective of the terminal device 110 with reference to FIG. 1.
  • the terminal device 110 changes a relaxation status of RLM or BFD.
  • the terminal device 110 transmits, to a network device, an indication associated with the condition.
  • the criterion of the condition comprises at least one of: a relaxed measurement criterion for the terminal device with a low mobility in RRC connected state, a relaxed measurement criterion for good serving cell quality, or DRX is used and a DRX cycle is not longer than a predefined value.
  • the relaxed measurement criterion for the terminal device with a low mobility in the RRC connected state comprises: a difference of a reference L3 RSRP measurement and a current L3 RSRP measurement is less than a first threshold.
  • the relaxed measurement criterion for good serving cell quality comprises: a downlink radio link quality of the serving cell is better than a second threshold.
  • the terminal device 110 performs at least one of an RLM relaxation or a BFD relaxation.
  • the criterion of the condition comprises at least one of: a relaxed measurement criterion for the terminal device with a high mobility in an RRC connected state, a relaxed measurement criterion for bad serving cell quality, DRX is not used, or a DRX cycle is longer than a predefined value.
  • the terminal device 110 stops performing at least one of an RLM relaxation or a BFD relaxation.
  • the indication indicates at least one of: information about the relaxation status, a DRX state, or a change of the condition.
  • the indication is transmitted in UAI. In some example embodiments, the indication is transmitted together with or separate from measurement relaxation state information.
  • the terminal device 110 starts a prohibit timer associated with the condition.
  • the terminal device 110 stops transmitting a further indication after a further change of the relaxation status.
  • the terminal device 110 if a further criterion of a further condition is fulfilled, the terminal device 110 further changes the relaxation status. In some example embodiments, the terminal device 110 transmits, to the network device, a further indication associated with the further condition, and starts a further prohibit timer associated with the further condition.
  • FIG. 4 illustrates a flowchart of a method 400 implemented at a network device in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the method 400 will be described from the perspective of the network device 120 with reference to FIG. 1.
  • the network device 120 receives, from a terminal device, an indication associated with a condition, the condition being used for determining whether to change a relaxation status of RLM or BFD.
  • the network device 120 determines that a criterion of the condition has been fulfilled and the relaxation status of the RLM or the BFD has been changed based on the indication.
  • the criterion of the condition comprises at least one of: a relaxed measurement criterion for the terminal device with a low mobility in RRC connected state, a relaxed measurement criterion for good serving cell quality, or DRX is used and a DRX cycle is not longer than a predefined value.
  • the relaxed measurement criterion for the terminal device with a low mobility in the RRC connected state comprises: a difference of a reference L3 RSRP measurement and a current L3 RSRP measurement is less than a first threshold.
  • the relaxed measurement criterion for good serving cell quality comprises: a downlink radio link quality of the serving cell is better than a second threshold.
  • the network device 120 determines that the terminal device has performed at least one of an RLM relaxation or a BFD relaxation.
  • the criterion of the condition comprises at least one of: a relaxed measurement criterion for the terminal device with a high mobility in an RRC connected state, a relaxed measurement criterion for bad serving cell quality, DRX is not used, or a DRX cycle is longer than a predefined value.
  • the network device 120 determines that the terminal device has stopped performing at least one of an RLM relaxation or a BFD relaxation.
  • the indication indicates at least one of: information about the relaxation status, a DRX state, or a change of the condition.
  • the indication is transmitted in UAI. In some example embodiments, the indication is transmitted together with or separate from measurement relaxation state information.
  • the network device 120 starts a prohibit timer associated with the condition.
  • the network device 120 stops monitoring a further indication associated with any condition.
  • the network device 120 receives, from the terminal device, a further indication associated with a further condition; the network device 120 determines that a further criterion of the further condition has been fulfilled and the relaxation status of the RLM or the BFD has been further changed based on the further indication; and the network device 120 starts a further prohibit timer associated with the further condition.
  • an apparatus capable of performing the method 300 may comprise means for performing the respective steps of the method 300.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus comprises: means for based on a determination that a criterion of a condition is fulfilled, changing a relaxation status of a radio link monitoring (RLM) or a beam failure detection (BFD) ; and means for transmitting, to a network device, an indication associated with the condition.
  • RLM radio link monitoring
  • BFD beam failure detection
  • the criterion of the condition comprises at least one of: a relaxed measurement criterion for the terminal device with a low mobility in RRC connected state, a relaxed measurement criterion for good serving cell quality, or DRX is used and a DRX cycle is not longer than a predefined value.
  • the relaxed measurement criterion for the terminal device with a low mobility in the RRC connected state comprises: a difference of a reference L3 RSRP measurement and a current L3 RSRP measurement is less than a first threshold.
  • the relaxed measurement criterion for good serving cell quality comprises: a downlink radio link quality of the serving cell is better than a second threshold.
  • the apparatus comprises: means for performing at least one of an RLM relaxation or a BFD relaxation.
  • the criterion of the condition comprises at least one of: a relaxed measurement criterion for the terminal device with a high mobility in an RRC connected state, a relaxed measurement criterion for bad serving cell quality, DRX is not used, or a DRX cycle is longer than a predefined value.
  • the apparatus comprises: means for stopping performing at least one of an RLM relaxation or a BFD relaxation.
  • the indication indicates at least one of: information about the relaxation status, a DRX state, or a change of the condition.
  • the indication is transmitted in UAI. In some example embodiments, the indication is transmitted together with or separate from measurement relaxation state information.
  • the apparatus comprises: means for starting a prohibit timer associated with the condition.
  • the apparatus comprises: means for based on a determination that the prohibit timer associated with the condition is running, stopping transmitting a further indication after a further change of the relaxation status.
  • the apparatus comprises: means for based on a determination that a further criterion of a further condition is fulfilled, further changing the relaxation status; and means for transmitting, to the network device, a further indication associated with the further condition; and means for starting a further prohibit timer associated with the further condition.
  • an apparatus capable of performing the method 400 may comprise means for performing the respective steps of the method 400.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus comprises: means for receiving, from a terminal device, an indication associated with a condition, the condition being used for determining whether to change a relaxation status of RLM or BFD; and means for determining that a criterion of the condition has been fulfilled and the relaxation status of the RLM or the BFD has been changed based on the indication.
  • the criterion of the condition comprises at least one of: a relaxed measurement criterion for the terminal device with a low mobility in RRC connected state, a relaxed measurement criterion for good serving cell quality, or DRX is used and a DRX cycle is not longer than a predefined value.
  • the relaxed measurement criterion for the terminal device with a low mobility in the RRC connected state comprises: a difference of a reference L3 RSRP measurement and a current L3 RSRP measurement is less than a first threshold.
  • the relaxed measurement criterion for good serving cell quality comprises: a downlink radio link quality of the serving cell is better than a second threshold.
  • the apparatus comprises: means for determining that the terminal device has performed at least one of an RLM relaxation or a BFD relaxation.
  • the criterion of the condition comprises at least one of: a relaxed measurement criterion for the terminal device with a high mobility in an RRC connected state, a relaxed measurement criterion for bad serving cell quality, DRX is not used, or a DRX cycle is longer than a predefined value.
  • the apparatus comprises: means for determining that the terminal device has stopped performing at least one of an RLM relaxation or a BFD relaxation.
  • the indication indicates at least one of: information about the relaxation status, a DRX state, or a change of the condition.
  • the indication is transmitted in UAI. In some example embodiments, the indication is transmitted together with or separate from measurement relaxation state information.
  • the apparatus comprises: means for starting a prohibit timer associated with the condition.
  • the apparatus comprises: means for based on a determination that the prohibit timer associated with the condition is running, stopping monitoring a further indication associated with any condition.
  • the apparatus comprises: means for receiving, from the terminal device, a further indication associated with a further condition; means for determining that a further criterion of the further condition has been fulfilled and the relaxation status of the RLM or the BFD has been further changed based on the further indication; and means for starting a further prohibit timer associated with the further condition.
  • FIG. 5 illustrates a simplified block diagram of a device 500 that is suitable for implementing some example embodiments of the present disclosure.
  • the device 500 may be provided to implement the communication device, for example the terminal device 110 or the network device 120 as shown in FIG. 1.
  • the device 500 includes one or more processors 510, one or more memories 520 coupled to the processor 510, and one or more communication modules 540 coupled to the processor 510.
  • the communication module 540 is for bidirectional communications.
  • the communication module 540 has at least one antenna to facilitate communication.
  • the communication interface may represent any interface that is necessary for communication with other network elements.
  • the processor 510 may be of any type suitable to the local technical network and may include one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 500 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
  • the memory 520 may include one or more non-volatile memories and one or more volatile memories.
  • the non-volatile memories include, but are not limited to, a Read Only Memory (ROM) 524, an electrically programmable read only memory (EPROM) , a flash memory, a hard disk, a compact disc (CD) , a digital video disk (DVD) , and other magnetic storage and/or optical storage.
  • the volatile memories include, but are not limited to, a random access memory (RAM) 522 and other volatile memories that will not last in the power-down duration.
  • a computer program 530 includes computer executable instructions that are executed by the associated processor 510.
  • the program 530 may be stored in the ROM 524.
  • the processor 510 may perform any suitable actions and processing by loading the program 530 into the RAM 522.
  • the embodiments of the present disclosure may be implemented by means of the program 530 so that the device 500 may perform any process of the disclosure as discussed with reference to FIGS. 2-4.
  • the embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.
  • the program 530 may be tangibly contained in a computer readable medium which may be included in the device 500 (such as in the memory 520) or other storage devices that are accessible by the device 500.
  • the device 500 may load the program 530 from the computer readable medium to the RAM 522 for execution.
  • the computer readable medium may include any types of tangible non-volatile storage, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like.
  • FIG. 6 illustrates a block diagram of an example of a computer readable medium 600 in accordance with some example embodiments of the present disclosure.
  • the computer readable medium 600 has the program 530 stored thereon. It is noted that although the computer readable medium 600 is depicted in form of CD or DVD in FIG. 6, the computer readable medium 600 may be in any other form suitable for carry or hold the program 530.
  • various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium.
  • the computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the method as described above with reference to any of FIGS. 3-4.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types.
  • the functionality of the program modules may be combined or split between program modules as desired in various embodiments.
  • Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
  • Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
  • the computer program codes or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above.
  • Examples of the carrier include a signal, computer readable medium, and the like.
  • the computer readable medium may be a computer readable signal medium or a computer readable storage medium.
  • a computer readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the computer readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
  • non-transitory is a limitation of the medium itself (i.e., tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., RAM vs. ROM) .

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

Abstract

Des exemples de modes de réalisation de la présente invention concernent un dispositif terminal, un dispositif de réseau, des procédés, des appareils et un support de stockage lisible par ordinateur pour un rapport d'état de relâchement RLM/BFD. Dans certains modes de réalisation, un dispositif terminal peut changer son statut de relâchement RLM/BFD si un critère d'une condition est satisfait. Le dispositif terminal peut en outre transmettre une indication associée à la condition à un dispositif de réseau, de telle sorte que le dispositif de réseau puisse être informé de la raison pour laquelle le dispositif terminal change son statut de relâchement RLM/BFD. En conséquence, le dispositif de réseau peut savoir pourquoi le dispositif terminal relâche les mesures RLM/BFD ou pourquoi le dispositif terminal ne relâche pas les mesures RLM/BFD.
PCT/CN2023/093410 2023-05-11 2023-05-11 Rapport d'état de relâchement rlm ou bfd Pending WO2024229782A1 (fr)

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PCT/CN2023/093410 WO2024229782A1 (fr) 2023-05-11 2023-05-11 Rapport d'état de relâchement rlm ou bfd
CN202380097960.1A CN121058278A (zh) 2023-05-11 2023-05-11 Rlm或bfd放松状态报告

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