WO2024093327A1 - Mesure relâchée améliorée - Google Patents

Mesure relâchée améliorée Download PDF

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Publication number
WO2024093327A1
WO2024093327A1 PCT/CN2023/105143 CN2023105143W WO2024093327A1 WO 2024093327 A1 WO2024093327 A1 WO 2024093327A1 CN 2023105143 W CN2023105143 W CN 2023105143W WO 2024093327 A1 WO2024093327 A1 WO 2024093327A1
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Prior art keywords
criterion
variation
distance
configuration
evaluation
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PCT/CN2023/105143
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English (en)
Inventor
Min Xu
Jing HAN
Lianhai WU
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Lenovo (Beijing) Limited
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Priority to PCT/CN2023/105143 priority Critical patent/WO2024093327A1/fr
Publication of WO2024093327A1 publication Critical patent/WO2024093327A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements

Definitions

  • the present disclosure relates to wireless communications, and more specifically to a user equipment (UE) , a base station, processors for wireless communication, methods, and a computer readable medium for enhanced relaxed measurement.
  • UE user equipment
  • a wireless communications system may include one or multiple network communication devices, such as base stations, which may be otherwise known as an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology.
  • Each network communication devices such as a base station may support wireless communications for one or multiple user communication devices, which may be otherwise known as user equipment (UE) , or other suitable terminology.
  • the wireless communications system may support wireless communications with one or multiple user communication devices by utilizing resources of the wireless communication system (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) .
  • the wireless communications system may support wireless communications across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, among other suitable radio access technologies beyond 5G (e.g., sixth generation (6G) ) .
  • 3G third generation
  • 4G fourth generation
  • 5G fifth generation
  • 6G sixth generation
  • RedCap Reduced Capability
  • NR new radio
  • RRM Radio Resource Management
  • RRM Radio Resource Management
  • the present disclosure relates to methods, apparatuses, and systems for enhanced relaxed measurement. Embodiments of the disclosure may avoid unnecessary evaluation and ensure accurate evaluation for relaxed measurement considering network characteristics.
  • a UE comprises a processor; and a transceiver coupled to the processor, wherein the processor is configured to: receive, via the transceiver and from a base station, a first configuration for relaxed measurement evaluation and a second configuration for neighbour cell measurement, wherein the second configuration includes an indication associated with the neighbour cell measurement triggering or a supplementary configuration for the relaxed measurement evaluation; and perform the relaxed measurement evaluation based on the first configuration and the second configuration.
  • a base station comprising a processor; and a transceiver coupled to the processor, wherein the processor is configured to: determine a first configuration for relaxed measurement evaluation and a second configuration for neighbour cell measurement, wherein the second configuration includes an indication associated with the neighbour cell measurement triggering or a supplementary configuration for the relaxed measurement evaluation; and transmit, via the transceiver, the first configuration and the second configuration to a user equipment (UE) .
  • UE user equipment
  • a processor for wireless communication comprise at least one memory; and a controller coupled with the at least one memory and configured to cause the controller to: receive, at a user equipment and from a base station, a first configuration for relaxed measurement evaluation and a second configuration for neighbour cell measurement, wherein the second configuration includes an indication associated with the neighbour cell measurement triggering or a supplementary configuration for the relaxed measurement evaluation; and perform the relaxed measurement evaluation based on the first configuration and the second configuration
  • a processor for wireless communication comprise at least one memory; and a controller coupled with the at least one memory and configured to cause the controller to: determine, at a base station, a first configuration for relaxed measurement evaluation and a second configuration for neighbour cell measurement, wherein the second configuration includes an indication associated with the neighbour cell measurement triggering or a supplementary configuration for the relaxed measurement evaluation; and transmit the first configuration and the second configuration to a user equipment (UE) .
  • UE user equipment
  • a method performed by a UE comprises: receiving, from a base station, a first configuration for relaxed measurement evaluation and a second configuration for neighbour cell measurement, wherein the second configuration includes an indication associated with the neighbour cell measurement triggering or a supplementary configuration for the relaxed measurement evaluation; and performing the relaxed measurement evaluation based on the first configuration and the second configuration.
  • a method performed by a base station comprises: determining a first configuration for relaxed measurement evaluation and a second configuration for neighbour cell measurement, wherein the second configuration includes an indication associated with the neighbour cell measurement triggering or a supplementary configuration for the relaxed measurement evaluation; and transmitting the first configuration and the second configuration to a user equipment (UE) .
  • UE user equipment
  • the first configuration may include at least one of: a reference-signal-received-power (RSRP) -based stationary or low mobility criterion for relaxed measurement; or a RSRP/reference-signal-received-quality (RSRQ) -based not-at-cell-edge criterion for relaxed measurement.
  • RSRP reference-signal-received-power
  • RSRQ reference-signal-received-quality
  • the indication associated with the neighbor cell measurement triggering may include one of: an indication of time-based neighbour cell measurement triggering, or an indication of distance-based neighbour cell measurement triggering.
  • the UE may determine whether the neighbour cell measurement is required by fulfilment of a time-based criterion based on the indication of time-based neighbour cell measurement triggering; and one of the following: based on determining that the neighbour cell measurement is required by the fulfilment of the time-based criterion, ignore the relaxed measurement evaluation; or based on determining that the neighbour cell measurement is not required by the fulfilment of the time-based criterion, continue the relaxed measurement evaluation.
  • the indication of time-based neighbour cell measurement triggering may include one of a stop serving time or a feeder link switch time of a serving non-terrestrial network (NTN) cell.
  • NTN non-terrestrial network
  • the time-based criterion may be fulfilled when an interval between current time and the stop serving time or the feeder link switch time is less than a time threshold.
  • the UE may determine whether the neighbour cell measurement is required by a distance-based criterion based on the indication of distance-based neighbour cell measurement triggering; and one of the following: based on determining that neighbour cell measurement is required by the fulfilment of the distance-based criterion, ignore the relaxed measurement evaluation; based on determining that the neighbour cell measurement is required by the fulfilment of the distance-based criterion and a serving NTN cell for the UE is an earth-moving cell, continue the relaxed measurement evaluation; or based on determining that the neighbour cell measurement is not required by the fulfilment of the distance-based criterion, continue the relaxed measurement evaluation.
  • the indication of distance-based neighbour cell measurement triggering may include a reference location or a distance threshold.
  • the distance-based criterion may be fulfilled when a distance from the UE to the reference location is larger than the distance threshold.
  • the UE may continue the relaxed measurement evaluation with an offset applied to the first configuration based on determining that the neighbour cell measurement is required by fulfilment of a RSRP/RSRQ-based criterion.
  • the supplementary configuration for the relaxed measurement evaluation may include at least one criterion for stationary status evaluation, and the UE may perform the relaxed measurement evaluation using the at least one criterion for stationary status evaluation.
  • the at least one criterion for stationary status evaluation may include a distance-variation-based criterion indicative of one of the following: a first threshold of variation of distance from the UE to a previous UE reference location, a second threshold of the variation of distance from the UE to a serving cell reference location, a third threshold of variation of distance from the UE to a serving cell reference location minus an expected distance variation due to movement of an access node or the base station, or a fourth threshold of variation rate of distance from the UE to a serving cell reference location.
  • performing the relaxed measurement evaluation may comprise determining the distance-variation-based criterion is fulfilled based on determining one of the following: a variation of distance from the UE to the previous UE reference location is smaller or no larger than the first threshold for once or for a certain time duration; a variation of distance from the UE to the serving cell reference location is smaller or no larger than the second threshold for once or for a certain time duration; a variation of distance from the UE to the serving cell reference location minus the expected distance variation due to movement of the access node or the base station is smaller or no larger than the third threshold for once or for a certain time duration; or a variation rate of distance from the UE to the serving cell reference location is smaller or no larger than the fourth threshold for once or for a certain time duration.
  • the at least one criterion for stationary status evaluation may include a terrestrial network (TN) -area-based criterion indicative of one of the following: a fifth threshold of variation of distance from the UE to at least one TN area reference location, or a sixth threshold of a fulfilment status of a distance-based criterion for at least one TN area.
  • TN terrestrial network
  • performing the relaxed measurement evaluation may comprise: determining the TN-area-based criterion is fulfilled based on determining one of the following: a variation of distance from the UE to the at least one TN area reference location is smaller or no larger than the fifth threshold for once or for a certain time duration; or a variation of distance from the UE to the at least one TN area reference location is smaller or no larger than the sixth threshold for once or for a certain time duration.
  • the at least one criterion for stationary status evaluation may include a propagation-delay-variation-based criterion or a TA-delay-variation-based criterion indicative of one of the following: a seventh threshold of variation of propagation delay or TA between the UE and the base station minus expected propagation delay or TA variation due to movement of an access node or the base station, or an eighth threshold of variation rate of propagation delay or TA between the UE and the base station.
  • performing the relaxed measurement evaluation may comprise: determining the propagation-delay-variation-based criterion or the TA-delay-variation-based criterion is fulfilled based on determining one of the following: a variation of the propagation delay or the TA between the UE and the base station minus the expected propagation delay or TA variation due to the movement of the access node or the base station is smaller or no larger than the seventh threshold for once or for a certain time duration; or a variation rate of the propagation delay or the TA between the UE and the base station is smaller or no larger than the eighth threshold for once or for a certain time duration.
  • the at least one criterion for stationary status evaluation may include an elevation-angle-variation-based criterion indicative of one of the following: a ninth threshold of variation of an elevation angle between the UE and the base station minus an expected elevation angle variation due to movement of an access node or the base station, or a tenth threshold of variation rate of the elevation angle between the UE and the base station.
  • performing the relaxed measurement evaluation may comprise: determining the elevation-angle-variation-based criterion is fulfilled based on determining one of the following: a variation of the elevation angle between the UE and the base station minus the expected elevation angle variation due to the movement of the access node or the base station is smaller or no larger than the ninth threshold for once or for a certain time duration; or a variation rate of the elevation angle between the UE and the base station is smaller or no larger than the tenth threshold for once or for a certain time duration if configured.
  • the supplementary configuration for the relaxed measurement evaluation may include at least one reference RSRP update rule, and the processor is configured to perform the relaxed measurement evaluation with the at least one reference RSRP update rule.
  • the at least one reference RSRP update rule may include one of the following: a first time duration for a guard timer; a second time duration for update of a reference RSRP; an indication of ignoring update of the reference RSRP, or an update threshold of the reference RSRP.
  • performing the relaxed measurement evaluation may comprise one of the following: after starting the guard timer upon update of the reference RSRP, preventing the update of the reference RSRP in the first time duration; updating the reference RSRP based on determining that a current RSRP is larger than the reference RSRP for the second time duration; ignoring the update of the reference RSRP upon reception of the indication; or updating the reference RSRP based on determining that a difference between the current RSRP and the reference RSRP is equal to or larger than the update threshold.
  • the first configuration may include a RSRP-based stationary or low mobility criterion for relaxed measurement
  • the supplementary configuration includes at least one offset for the RSRP-based stationary or low mobility criterion for relaxed measurement
  • performing the relaxed measurement evaluation may comprise performing stationary status evaluation based on the RSRP-based stationary or low mobility criterion with the at least one offset.
  • the at least one offset may include one of the following: an offset to a threshold on RSRP variation to evaluate the RSRP-based stationary or low mobility criterion; or an offset to a time period over which the RSRP variation is evaluated for stationary or low mobility criterion for relaxed measurement.
  • the at least one offset may be associated with one of the following: a distance or variation of distance from the UE to a point; a propagation delay or a timing advance (TA) or a variation of the propagation delay or the TA between the UE and the base station; or an elevation angle or a variation of the elevation angle between the UE and the base station.
  • TA timing advance
  • the supplementary configuration may further include at least one criterion for not-at-cell-edge status evaluation, and the UE may perform the relaxed measurement evaluation at least based on the at least one criterion for not-at-cell-edge status evaluation.
  • the at least one criterion for not-at-cell-edge status evaluation may include a distance-variation-based criterion indicative of an eleventh threshold of a distance from the UE to a serving cell reference location
  • performing the relaxed measurement evaluation may comprise: determining that the distance-variation-based criterion is fulfilled based on determining that the distance from UE to the serving cell reference location is smaller or no larger than the eleventh threshold for once or for a certain time duration.
  • the at least one criterion for not-at-cell-edge status evaluation may include a propagation-delay-based or TA-based criterion indicative of a twelfth threshold of a propagation delay or a TA between the UE and the base station, and performing the relaxed measurement evaluation may comprise: determining that the propagation-delay-based or TA-based criterion is fulfilled based on determining that the propagation delay or the TA between UE and the base station is smaller or no larger than the twelfth threshold for once or for a certain time duration.
  • the at least one criterion for not-at-cell-edge status evaluation may include an elevation-angle-based criterion indicative of a thirteenth threshold of an elevation angle between the UE and the base station, and performing the relaxed measurement evaluation may comprise: determining that the elevation-angle-based criterion is fulfilled based on determining that the elevation angle between UE and the base station is smaller or no larger than the thirteenth threshold for once or for a certain time duration.
  • the UE may be a reduced capability (Redcap) UE.
  • Redcap reduced capability
  • the first configuration may include at least one of: a reference-signal-received-power (RSRP) -based stationary or low mobility criterion for relaxed measurement, or a RSRP/reference-signal-received-quality (RSRQ) -based not-at-cell-edge criterion for relaxed measurement.
  • RSRP reference-signal-received-power
  • RSRQ reference-signal-received-quality
  • the indication associated with the neighbor cell measurement triggering may include one of: an indication of time-based neighbour cell measurement triggering, or an indication of distance-based neighbour cell measurement triggering.
  • the indication of time-based neighbour cell measurement triggering may include one of a stop serving time or a feeder link switch time of a serving non-terrestrial network (NTN) cell.
  • NTN non-terrestrial network
  • the indication of distance-based neighbour cell measurement triggering may include a reference location or a distance threshold.
  • the supplementary configuration for the relaxed measurement evaluation may include at least one criterion for stationary status evaluation.
  • the at least one criterion for stationary status evaluation may include a distance-variation-based criterion indicative of one of the following: a first threshold of variation of distance from the UE to a previous UE reference location, a second threshold of the variation of distance from the UE to a serving cell reference location, a third threshold of variation of distance from the UE to a serving cell reference location minus an expected distance variation due to movement of an access node or the base station, or a fourth threshold of variation rate of distance from the UE to a serving cell reference location.
  • the at least one criterion for stationary status evaluation may include a terrestrial network (TN) -area-based criterion indicative of one of the following: a fifth threshold of variation of distance from the UE to at least one TN area reference location, or a sixth threshold of a fulfilment status of a distance-based criterion for at least one TN area.
  • TN terrestrial network
  • the at least one criterion for stationary status evaluation may include a propagation-delay-variation-based criterion or a TA-delay-variation-based criterion indicative of one of the following: a seventh threshold of variation of propagation delay or TA between the UE and the base station minus expected propagation delay or TA variation due to movement of an access node or the base station, or an eighth threshold of variation rate of propagation delay or TA between the UE and the base station.
  • the at least one criterion for stationary status evaluation may include an elevation-angle-variation-based criterion indicative of one of the following: a ninth threshold of variation of an elevation angle between the UE and the base station minus an expected elevation angle variation due to movement of an access node or the base station, or a tenth threshold of variation rate of the elevation angle between the UE and the base station.
  • the supplementary configuration for the relaxed measurement evaluation may include at least one reference RSRP update rule.
  • the at least one reference RSRP update rule may include one of the following: a first time duration for a guard timer; a second time duration for update of a reference RSRP; an indication of ignoring update of the reference RSRP, or an update threshold of the reference RSRP.
  • the first configuration may include a RSRP-based stationary or low mobility criterion for relaxed measurement and the supplementary configuration includes at least one offset for the RSRP-based stationary or low mobility criterion for relaxed measurement.
  • the at least one offset may include one of the following: an offset to a threshold on RSRP variation to evaluate the RSRP-based stationary or low mobility criterion; or an offset to a time period over which the RSRP variation is evaluated for stationary or low mobility criterion for relaxed measurement.
  • the at least one offset may be associated with one of the following: a distance or variation of distance from the UE to a point; a propagation delay or a timing advance (TA) or a variation of the propagation delay or the TA between the UE and the base station; or an elevation angle or a variation of the elevation angle between the UE and the base station.
  • TA timing advance
  • the supplementary configuration may include at least one criterion for not-at-cell-edge status evaluation.
  • the at least one criterion for not-at-cell-edge status evaluation may include one of the following: a distance-variation-based criterion indicative of an eleventh threshold of a distance from the UE to a serving cell reference location; a propagation-delay-based or TA-based criterion indicative of a twelfth threshold of a propagation delay or a TA between the UE and the base station; or a thirteenth threshold of an elevation angle between the UE and the base station.
  • the base station is located at a satellite or communicates with the UE via a satellite.
  • FIG. 1 illustrates an example of a wireless communications system in which some embodiments of the present disclosure can be implemented.
  • FIG. 2 illustrates an example of a process flow in accordance with some example embodiments of the present disclosure
  • FIGS. 3A-3E illustrate schematic diagrams of enhanced stationery status evaluation in accordance with some example embodiments of the present disclosure
  • FIG. 4 illustrates another example of a process flow in accordance with some example embodiments of the present disclosure
  • FIG. 5 illustrates an example of a device that is suitable for implementing some embodiments of the present disclosure
  • FIG. 6 illustrates an example of a processor that is suitable for implementing some embodiments of the present disclosure
  • FIG. 7 illustrates another example of a device that is suitable for implementing some embodiments of the present disclosure
  • FIG. 8 illustrates another example of a processor that is suitable for implementing some embodiments of the present disclosure
  • FIG. 9 illustrates a flowchart of a method that performed by a user equipment in accordance with aspects of the present disclosure.
  • FIG. 10 illustrates a flowchart of a method that performed by a base station in accordance with aspects of the present disclosure.
  • references in the present disclosure to “one embodiment, ” “an example embodiment, ” “an embodiment, ” “some embodiments, ” and the like indicate that the embodiment (s) 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 do not necessarily refer to the same embodiment (s) . 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 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 element. For example, a first element could also be termed as a second element, and similarly, a second element could also be termed as a first element, without departing from the scope of embodiments.
  • the term “and/or” includes any and all combinations of one or more of the listed terms. In some examples, values, procedures, or apparatuses are referred to as “best, ” “lowest, ” “highest, ” “minimum, ” “maximum, ” or the like. It will be appreciated that such descriptions are intended to indicate that a selection among many used functional alternatives can be made, and such selections need not be better, smaller, higher, or otherwise preferable to other selections.
  • the term “includes” and its variants are to be read as open terms that mean “includes, but is not limited to. ”
  • the term “based on” is to be read as “based at least in part on. ”
  • the term “one embodiment” and “an embodiment” are to be read as “at least one embodiment. ”
  • the term “another embodiment” is to be read as “at least one other embodiment. ”
  • the use of an expression such as “Aand/or B” can mean either “only A” or “only B” or “both A and B. ”
  • Other definitions, explicit and implicit, may be included below.
  • NTN Non-terrestrial Network
  • the satellite in NTN can be a GEO (Geostationary Earth Orbiting) satellite with fixed location to the Earth, or a LEO (Low Earth Orbiting) satellite orbiting around the Earth.
  • GEO Globalstar
  • LEO Low Earth Orbit
  • 3GPP Rel-17 specifications have provided basic support of NTN features and in Rel-18 further enhancements are to be studied.
  • neighbour cell measurement triggering now considers earth-moving cell to see if the time-based and distance-based triggering can be applied.
  • TN area indication is also under discussion to help UE avoid unnecessary measurement on some of TN frequencies based UE’s distance to the TN area.
  • neighbour cell measurement triggering and relaxed measurement evaluation are two different procedures, wherein the evaluation for the fulfillment of relaxed measurement criterion is performed after a neighbour cell measurement is triggered.
  • the time-based and distance-based neighbour cell measurement triggering introduced in NTN provides the opportunity of avoiding unnecessary evaluation for relaxed measurement.
  • the distance-based neighbour cell measurement triggering and TN area indication also provide distance information that can be reused or referred in some of the proposed solutions regarding distance variation.
  • the NTN cell is temporarily valid depending on the movement of its corresponding satellite.
  • a quasi-earth-fixed NTN cell which is temporarily fixed on earth (i.e., cell does not move along with satellite)
  • the entire cell will become invalid
  • an earth-moving NTN cell which is mobile on earth (i.e., cell moves along with satellite)
  • the cell will become invalid for a location when its coverage leaves, or the entire cell will become invalid when the corresponding LEO satellite approaches its feeder link switch time (t-FLswitch) .
  • a neighbour cell measurement could be required due to fulfillment of NTN-specific time/distance-based conditions (e.g., UE is required to perform neighbour cell measurement before t-Service, or when distance from UE to cell reference location referenceLocation is larger than distanceThresh) .
  • NTN-specific time/distance-based conditions e.g., UE is required to perform neighbour cell measurement before t-Service, or when distance from UE to cell reference location referenceLocation is larger than distanceThresh.
  • Case #1-1 A RedCap UE is served by an NTN cell broadcasting stationaryMobilityEvaluation (i.e., relaxed measurement evaluation is enabled) and optionally cellEdgeEvaluationWhileStationary in SIB2.
  • the serving NTN cell is approaching its stop serving time (t-Service) or its feeder link switch time (t-FLswitch) , or is leaving its covered area due to movement.
  • the intra-frequency, inter-frequency or inter-RAT measurements on neighbour cell is required before a specific time (t-Service, t-FLswitch or a time point estimated by UE) .
  • the serving NTN cell will inevitably disappear making relaxed measurement meaningless and UE shall not evaluate whether relaxed measurement can be applied.
  • Case #1-2 A RedCap UE is served by an NTN cell broadcasting stationaryMobilityEvaluation (i.e., relaxed measurement evaluation is enabled) and optionally cellEdgeEvaluationWhileStationary in SIB2.
  • the serving earth-moving NTN cell is leaving its covered area due to satellite movement.
  • the intra-frequency, inter-frequency or inter-RAT measurements on neighbour cell is required due to fulfillment of distance-based criterion (i.e., distance from UE to cell reference location referenceLocation is larger than distanceThresh) .
  • distance-based criterion i.e., distance from UE to cell reference location referenceLocation is larger than distanceThresh
  • the serving NTN cell will inevitably disappear making relaxed measurement meaningless, and UE shall not evaluate whether relaxed measurement can be applied.
  • Case #1-3 A RedCap UE is served by an NTN cell broadcasting stationaryMobilityEvaluation (i.e., relaxed measurement evaluation is enabled) and optionally cellEdgeEvaluationWhileStationary in SIB2.
  • the UE is leaving the NTN cell covered area due to UE movement.
  • the intra-frequency, inter-frequency or inter-RAT measurements on neighbour cell is required due to fulfillment of distance-based criterion (i.e., distance from UE to cell reference location referenceLocation is larger than distanceThresh) .
  • the serving NTN cell may or may not disappear, and relaxed measurement may still be meaningful.
  • UE may continue to evaluate whether relaxed measurement can be applied.
  • Case #1-4 A RedCap UE is served by an NTN cell broadcasting stationaryMobilityEvaluation (i.e., relaxed measurement evaluation is enabled) and optionally cellEdgeEvaluationWhileStationary in SIB2.
  • the intra-frequency, inter-frequency or inter-RAT measurements on neighbour cell is required due to fulfillment of RSRP/RSRQ-based criterion (i.e., distance from UE to cell reference location referenceLocation is larger than distanceThresh) .
  • This case has no difference from that in TN, and relaxed measurement may still be meaningful.
  • UE may continue to evaluate whether relaxed measurement can be applied.
  • the legacy stationary status evaluation is based on RSRP change which is obvious when UE is moving to or away from cell center due to the near-far effect and fixed location of eNB/gNB in TN.
  • this only criterion may not work well.
  • the RSRP variation could be ignorable even if UE is moving due to the high altitude of GEO;
  • satellite movement may cause RSRP variation even if UE is stationary. In either circumstance the RSRP variation as the only criterion may not represent the stationary status of UE.
  • Case #2-1 A RedCap UE is served by an NTN cell generated by GEO satellite broadcasting stationaryMobilityEvaluation in SIB2 (i.e., relaxed measurement evaluation is enabled) .
  • the RSRP difference between two locations in the cell is not obvious. If a small S SearchDeltaP-Stationary is configured in SIB2, few RedCap UEs can fulfill the stationary criterion causing more power consumption due to normal measurement. If a large S SearchDeltaP-Stationary is configured in SIB2, most RedCap UEs can fulfill the stationary criterion and thus may not detect neighbour cell in time.
  • Case #2-2 A RedCap UE is served by an NTN cell generated by LEO satellite broadcasting stationaryMobilityEvaluation in SIB2 (i.e., relaxed measurement evaluation is enabled) .
  • the movement of the LEO satellite leads to great RSRP variation at the same location.
  • RSRP variation makes it harder for UE to fulfill (Srxlev RefStationary –Srxlev) ⁇ S SearchDeltaP-Stationary for T SearchDeltaP-Stationary . If the NTN cell is not approaching its service stop time or feeder link switch time, it is expected that a stationary UE can apply relaxed measurement as early as possible.
  • the RSRP variation may lead to frequent fulfillment of (Srxlev -Srxlev RefStationary ) > 0 and thus frequent update of Srxlev RefStationary , which also makes it harder for UE to fulfill (Srxlev RefStationary –Srxlev) ⁇ S SearchDeltaP-Stationary for T SearchDeltaP-Stationary .
  • Srxlev RefStationary –Srxlev S SearchDeltaP-Stationary for T SearchDeltaP-Stationary .
  • the legacy not-at-cell-edge status evaluation is based on RSRP or RSRQ which is obviously high/low when UE is near/far from cell center due to the near-far effect in TN.
  • this only criterion may not work well.
  • the RSRP/RSRQ difference between cell center and cell edge is not that obvious due to the high altitude of GEO;
  • satellite movement may cause RSRP/RSRQ variation even if UE is at cell center.
  • the RSRP/RSRQ as the only criterion may not represent the not-at-cell-edge status of UE.
  • Case #3-1 A RedCap UE is served by an NTN cell generated by GEO satellite broadcasting stationaryMobilityEvaluation and cellEdgeEvaluationWhileStationary in SIB2 (i.e., relaxed measurement evaluation is enabled) .
  • the RSRP/RSRQ difference between cell center and cell edge in the cell is not obvious. If a small S SearchThresholdP2 or S SearchThresholdQ2 is configured in SIB2, few RedCap UEs can fulfill the not-at-cell-edge criterion causing more power consumption due to normal measurement. If a large S SearchThresholdP2 or S SearchThresholdQ2 is configured in SIB2, most RedCap UEs can fulfill the not-at-cell-edge criterion and thus may not detect neighbour cell in time.
  • Case #3-2 A RedCap UE is served by an NTN cell generated by LEO satellite broadcasting stationaryMobilityEvaluation and cellEdgeEvaluationWhileStationary in SIB2 (i.e., relaxed measurement evaluation is enabled) .
  • the movement of the LEO satellite leads to RSRP/RSRQ variation at the same location. If a small S SearchThresholdP2 or S SearchThresholdQ2 is configured in SIB2, few RedCap UEs can fulfill the not-at-cell-edge criterion causing more power consumption due to normal measurement.
  • the logic of UE applying relaxed measurement evaluation is modified to allow UE to ignore or disable the evaluation to reduce UE power consumption and to avoid UE entering relaxed measurement.
  • the enhancement may include new criterion based on distance variation, terrestrial network (TN) area, propagation delay variation and elevation angle variation for stationary status; additional reference RSRP update rules to legacy RSRP-variation-based criterion for stationary status evaluation; additional offsets to legacy RSRP-variation-based criterion for stationary status evaluation; and new criterion based on distance, propagation delay and elevation angle for not-at-cell-edge status evaluation.
  • TN terrestrial network
  • Embodiments of the disclosure can avoid unnecessary evaluation and ensure accurate evaluation for relaxed measurement considering NTN characteristics.
  • the embodiments of the disclosure can work at least in NTN scenarios to guarantee appropriate evaluation and entering/exiting of relaxed measurement for UEs. Note that the embodiments are also applicable in other network scenarios. Aspects of the present disclosure are described in the context of a wireless communications system.
  • FIG. 1 illustrates an example of a wireless communications system 100 in which some embodiments of the present disclosure can be implemented.
  • the wireless communications system 100 may include one or more network entities 102 (also referred to as network equipment (NE) ) , one or more UEs 104, a core network 106, and a packet data network 108.
  • the wireless communications system 100 may support various radio access technologies.
  • the wireless communications system 100 may be a 4G network, such as an LTE network or an LTE-Advanced (LTE-A) network.
  • LTE-A LTE-Advanced
  • the wireless communications system 100 may be a 5G network, such as an NR network.
  • the wireless communications system 100 may be a combination of a 4G network and a 5G network, or other suitable radio access technology including Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20.
  • IEEE Institute of Electrical and Electronics Engineers
  • Wi-Fi Wi-Fi
  • WiMAX IEEE 802.16
  • IEEE 802.20 The wireless communications system 100 may support radio access technologies beyond 5G. Additionally, the wireless communications system 100 may support technologies, such as time division multiple access (TDMA) , frequency division multiple access (FDMA) , or code division multiple access (CDMA) , etc.
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • CDMA code division multiple access
  • the one or more network entities 102 may be dispersed throughout a geographic region to form the wireless communications system 100.
  • One or more of the network entities 102 described herein may be or include or may be referred to as a network node, a base station, a network element, a radio access network (RAN) , a base transceiver station, an access point, a NodeB, an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology.
  • RAN radio access network
  • eNB eNodeB
  • gNB next-generation NodeB
  • a network entity 102 and a UE 104 may communicate via a communication link 110, which may be a wireless or wired connection.
  • a network entity 102 and a UE 104 may perform wireless communication (e.g., receive signaling, transmit signaling) over a Uu interface.
  • a network entity 102 in form of a satellite can directly communicate to UE 104 using NR/LTE Uu interface.
  • the satellite may be a transparent satellite or a regenerative satellite.
  • a base station on earth may communicate with a UE via the satellite.
  • the base station may be on board and directly communicate with the UE.
  • a network entity 102 may provide a geographic coverage area 112 for which the network entity 102 may support services (e.g., voice, video, packet data, messaging, broadcast, etc. ) for one or more UEs 104 within the geographic coverage area 112.
  • a network entity 102 and a UE 104 may support wireless communication of signals related to services (e.g., voice, video, packet data, messaging, broadcast, etc. ) according to one or multiple radio access technologies.
  • a network entity 102 may be moveable, for example, a satellite associated with a non-terrestrial network.
  • different geographic coverage areas 112 associated with the same or different radio access technologies may overlap, but the different geographic coverage areas 112 may be associated with different network entities 102.
  • Information and signals described herein may be represented using any of a variety of different technologies and techniques.
  • data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
  • the one or more UEs 104 may be dispersed throughout a geographic region of the wireless communications system 100.
  • a UE 104 may include or may be referred to as a mobile device, a wireless device, a remote device, a remote unit, a handheld device, or a subscriber device, or some other suitable terminology.
  • the UE 104 may be referred to as a unit, a station, a terminal, or a client, among other examples.
  • the UE 104 may be referred to as an Internet-of-Things (IoT) device, an Internet-of-Everything (IoE) device, or machine-type communication (MTC) device, among other examples.
  • IoT Internet-of-Things
  • IoE Internet-of-Everything
  • MTC machine-type communication
  • a UE 104 may be stationary in the wireless communications system 100.
  • a UE 104 may be mobile in the wireless communications system 100.
  • the one or more UEs 104 may be devices in different forms or having different capabilities. Some examples of UEs 104 are illustrated in FIG. 1.
  • a UE 104 may be capable of communicating with various types of devices, such as the network entities 102, other UEs 104, or network equipment (e.g., the core network 106, the packet data network 108, a relay device, an integrated access and backhaul (IAB) node, or another network equipment) , as shown in FIG. 1.
  • a UE 104 may support communication with other network entities 102 or UEs 104, which may act as relays in the wireless communications system 100.
  • a UE 104 may also be able to support wireless communication directly with other UEs 104 over a communication link 114.
  • a UE 104 may support wireless communication directly with another UE 104 over a device-to-device (D2D) communication link.
  • D2D device-to-device
  • the communication link 114 may be referred to as a sidelink.
  • a UE 104 may support wireless communication directly with another UE 104 over a PC5 interface.
  • a network entity 102 may support communications with the core network 106, or with another network entity 102, or both.
  • a network entity 102 may interface with the core network 106 through one or more backhaul links 116 (e.g., via an S1, N2, N2, or another network interface) .
  • the network entities 102 may communicate with each other over the backhaul links 116 (e.g., via an X2, Xn, or another network interface) .
  • the network entities 102 may communicate with each other directly (e.g., between the network entities 102) .
  • the network entities 102 may communicate with each other or indirectly (e.g., via the core network 106) .
  • one or more network entities 102 may include subcomponents, such as an access network entity, which may be an example of an access node controller (ANC) .
  • An ANC may communicate with the one or more UEs 104 through one or more other access network transmission entities, which may be referred to as a radio heads, smart radio heads, or transmission-reception points (TRPs) .
  • TRPs transmission-reception points
  • a network entity 102 may be configured in a disaggregated architecture, which may be configured to utilize a protocol stack physically or logically distributed among two or more network entities 102, such as an integrated access backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance) , or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN) ) .
  • IAB integrated access backhaul
  • O-RAN open RAN
  • vRAN virtualized RAN
  • C-RAN cloud RAN
  • a network entity 102 may include one or more of a central unit (CU) , a distributed unit (DU) , a radio unit (RU) , a RAN Intelligent Controller (RIC) (e.g., a Near-Real Time RIC (Near-RT RIC) , a Non-Real Time RIC (Non-RT RIC) ) , a Service Management and Orchestration (SMO) system, or any combination thereof.
  • CU central unit
  • DU distributed unit
  • RU radio unit
  • RIC RAN Intelligent Controller
  • RIC e.g., a Near-Real Time RIC (Near-RT RIC) , a Non-Real Time RIC (Non-RT RIC)
  • SMO Service Management and Orchestration
  • An RU may also be referred to as a radio head, a smart radio head, a remote radio head (RRH) , a remote radio unit (RRU) , or a transmission reception point (TRP) .
  • One or more components of the network entities 102 in a disaggregated RAN architecture may be co-located, or one or more components of the network entities 102 may be located in distributed locations (e.g., separate physical locations) .
  • one or more network entities 102 of a disaggregated RAN architecture may be implemented as virtual units (e.g., a virtual CU (VCU) , a virtual DU (VDU) , a virtual RU (VRU) ) .
  • VCU virtual CU
  • VDU virtual DU
  • VRU virtual RU
  • Split of functionality between a CU, a DU, and an RU may be flexible and may support different functionalities depending upon which functions (e.g., network layer functions, protocol layer functions, baseband functions, radio frequency functions, and any combinations thereof) are performed at a CU, a DU, or an RU.
  • functions e.g., network layer functions, protocol layer functions, baseband functions, radio frequency functions, and any combinations thereof
  • a functional split of a protocol stack may be employed between a CU and a DU such that the CU may support one or more layers of the protocol stack and the DU may support one or more different layers of the protocol stack.
  • the CU may host upper protocol layer (e.g., a layer 3 (L3) , a layer 2 (L2) ) functionality and signaling (e.g., Radio Resource Control (RRC) , service data adaption protocol (SDAP) , Packet Data Convergence Protocol (PDCP) ) .
  • RRC Radio Resource Control
  • SDAP service data adaption protocol
  • PDCP Packet Data Convergence Protocol
  • the CU may be connected to one or more DUs or RUs, and the one or more DUs or RUs may host lower protocol layers, such as a layer 1 (L1) (e.g., physical (PHY) layer) or an L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160.
  • L1 e.g., physical (PHY) layer
  • L2 e.g., radio link control (RLC) layer, medium access
  • a functional split of the protocol stack may be employed between a DU and an RU such that the DU may support one or more layers of the protocol stack and the RU may support one or more different layers of the protocol stack.
  • the DU may support one or multiple different cells (e.g., via one or more RUs) .
  • a functional split between a CU and a DU, or between a DU and an RU may be within a protocol layer (e.g., some functions for a protocol layer may be performed by one of a CU, a DU, or an RU, while other functions of the protocol layer are performed by a different one of the CU, the DU, or the RU) .
  • a CU may be functionally split further into CU control plane (CU-CP) and CU user plane (CU-UP) functions.
  • a CU may be connected to one or more DUs via a midhaul communication link (e.g., F1, F1-c, F1-u)
  • a DU may be connected to one or more RUs via a fronthaul communication link (e.g., open fronthaul (FH) interface)
  • FH open fronthaul
  • a midhaul communication link or a fronthaul communication link may be implemented in accordance with an interface (e.g., a channel) between layers of a protocol stack supported by respective network entities 102 that are in communication via such communication links.
  • the core network 106 may support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions.
  • the core network 106 may be an evolved packet core (EPC) , or a 5G core (5GC) , which may include a control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management functions (AMF) ) and a user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) .
  • EPC evolved packet core
  • 5GC 5G core
  • MME mobility management entity
  • AMF access and mobility management functions
  • S-GW serving gateway
  • PDN gateway Packet Data Network gateway
  • UPF user plane function
  • control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management (e.g., data bearers, signal bearers, etc. ) for the one or more UEs 104 served by the one or more network entities 102 associated with the core network 106.
  • NAS non-access stratum
  • the core network 106 may communicate with the packet data network 108 over one or more backhaul links 116 (e.g., via an S1, N2, N2, or another network interface) .
  • the packet data network 108 may include an application server 118.
  • one or more UEs 104 may communicate with the application server 118.
  • a UE 104 may establish a session (e.g., a protocol data unit (PDU) session, or the like) with the core network 106 via a network entity 102.
  • the core network 106 may route traffic (e.g., control information, data, and the like) between the UE 104 and the application server 118 using the established session (e.g., the established PDU session) .
  • the PDU session may be an example of a logical connection between the UE 104 and the core network 106 (e.g., one or more network functions of the core network 106) .
  • the network entities 102 and the UEs 104 may use resources of the wireless communications system 100 (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) ) to perform various operations (e.g., wireless communications) .
  • the network entities 102 and the UEs 104 may support different resource structures.
  • the network entities 102 and the UEs 104 may support different frame structures.
  • the network entities 102 and the UEs 104 may support a single frame structure.
  • the network entities 102 and the UEs 104 may support various frame structures (i.e., multiple frame structures) .
  • the network entities 102 and the UEs 104 may support various frame structures based on one or more numerologies.
  • One or more numerologies may be supported in the wireless communications system 100, and a numerology may include a subcarrier spacing and a cyclic prefix.
  • a first subcarrier spacing e.g., 15 kHz
  • a normal cyclic prefix e.g. 15 kHz
  • the first numerology associated with the first subcarrier spacing (e.g., 15 kHz) may utilize one slot per subframe.
  • a time interval of a resource may be organized according to frames (also referred to as radio frames) .
  • Each frame may have a duration, for example, a 10 millisecond (ms) duration.
  • each frame may include multiple subframes.
  • each frame may include 10 subframes, and each subframe may have a duration, for example, a 1 ms duration.
  • each frame may have the same duration.
  • each subframe of a frame may have the same duration.
  • a time interval of a resource may be organized according to slots.
  • a subframe may include a number (e.g., quantity) of slots.
  • the number of slots in each subframe may also depend on the one or more numerologies supported in the wireless communications system 100.
  • Each slot may include a number (e.g., quantity) of symbols (e.g., OFDM symbols) .
  • the number (e.g., quantity) of slots for a subframe may depend on a numerology.
  • a slot For a normal cyclic prefix, a slot may include 14 symbols.
  • a slot For an extended cyclic prefix (e.g., applicable for 60 kHz subcarrier spacing) , a slot may include 12 symbols.
  • an electromagnetic (EM) spectrum may be split, based on frequency or wavelength, into various classes, frequency bands, frequency channels, etc.
  • the wireless communications system 100 may support one or multiple operating frequency bands, such as frequency range designations FR1 (410 MHz –7.125 GHz) , FR2 (24.25 GHz –52.6 GHz) , FR3 (7.125 GHz –24.25 GHz) , FR4 (52.6 GHz –114.25 GHz) , FR4a or FR4-1 (52.6 GHz –71 GHz) , and FR5 (114.25 GHz –300 GHz) .
  • FR1 410 MHz –7.125 GHz
  • FR2 24.25 GHz –52.6 GHz
  • FR3 7.125 GHz –24.25 GHz
  • FR4 (52.6 GHz –114.25 GHz)
  • FR4a or FR4-1 52.6 GHz –71 GHz
  • FR5 114.25 GHz
  • the network entities 102 and the UEs 104 may perform wireless communications over one or more of the operating frequency bands.
  • FR1 may be used by the network entities 102 and the UEs 104, among other equipment or devices for cellular communications traffic (e.g., control information, data) .
  • FR2 may be used by the network entities 102 and the UEs 104, among other equipment or devices for short-range, high data rate capabilities.
  • FR1 may be associated with one or multiple numerologies (e.g., at least three numerologies) .
  • FR2 may be associated with one or multiple numerologies (e.g., at least 2 numerologies) .
  • FIG. 2 illustrates an example of a process flow in accordance with some example embodiments of the present disclosure.
  • the process flow 200 may involve a user equipment (UE) 201 and a base station 202.
  • the process flow 200 may be applied to the wireless communications system 100 with reference to FIG. 1, for example, the UE 201 may be a UE 104 and the base station 202 may be a network entity 102.
  • the UE 201 may be a reduced capability (Redcap) UE.
  • the base station 202 may be located at a satellite or communicates with the UE 201 via a satellite. It would be appreciated that the process flow 200 may be applied to other communication scenarios, which will not be described in detail.
  • the base station 202 determines 210 first configuration for relaxed measurement evaluation and a second configuration for neighbour cell measurement.
  • the second configuration includes an indication associated with the neighbour cell measurement triggering or a supplementary configuration for the relaxed measurement evaluation.
  • the first configuration may include a reference-signal-received-power (RSRP) -based stationary or low mobility criterion for relaxed measurement.
  • RSRP reference-signal-received-power
  • the RSRP-based stationary or low mobility criterion may include information element stationaryMobilityEvaluation based on RSRP variation.
  • the RSRP-based stationary or low mobility criterion may include a RSRP/reference-signal-received-quality (RSRQ) -based not-at-cell-edge criterion for relaxed measurement.
  • the RSRP/RSRQ-based not-at-cell-edge criterion may include information element cellEdgeEvaluationWhileStationary based on a RSRP/RSRP level at the UE 201.
  • the indication associated with the neighbor cell measurement triggering may include an indication of time-based neighbour cell measurement triggering.
  • the indication of time-based neighbour cell measurement triggering maybe a stop serving time (T-Service) or a feeder link switch time (T-FLswitch) of a serving NTN cell.
  • the indication associated with the neighbor cell measurement triggering may include an indication of distance-based neighbour cell measurement triggering.
  • the indication of distance-based neighbour cell measurement triggering may include a reference location or a distance threshold.
  • the supplementary configuration included in the second configuration may include at least one criterion for stationary status evaluation.
  • the at least one criterion for stationary status evaluation may include one or more of a distance-variation-based criterion, a terrestrial network (TN) -area-based criterion, a propagation-delay-variation-based criterion or a TA-delay-variation-based criterion, or an elevation-angle-variation-based criterion.
  • Each of the criterions for stationary status evaluation may be indicative of one or more thresholds for the UE 201 to evaluate its stationary or low mobility status. The criterions will be described in detail in the following with reference to FIGS. 3A-3E.
  • the supplementary configuration may include at least one criterion for not-at-cell-edge status evaluation.
  • the at least one criterion for not-at-cell-edge status evaluation may include one or more of a distance-variation-based criterion, a propagation-delay-based or TA-based criterion, and an elevation-angle-variation-based criterion.
  • Each of the criterions may be indicative of one or more thresholds for the UE 201 to evaluate its not-at-cell-edge status, which will be described in detail in the following.
  • the supplementary configuration may include at least one reference RSRP update rule.
  • the reference RSRP update rule (s) may include one or more of: a time duration for a guard timer, a time duration for update of a reference RSRP, an indication of ignoring update of the reference RSRP, or an update threshold of the reference RSRP.
  • the first configuration may include a RSRP-based stationary or low mobility criterion for relaxed measurement
  • the supplementary configuration may include at least one offset for the RSRP-based stationary or low mobility criterion for relaxed measurement.
  • the offset may be an offset to a threshold on RSRP variation to evaluate the RSRP-based stationary or low mobility criterion (e.g. legacy S searchDeltaP-Stationary ) , or an offset to a time period over which the RSRP variation is evaluated for stationary or low mobility criterion for relaxed measurement (e.g. legacy T searchDeltaP-Stationary ) .
  • the first configuration may include a RSRP/RSRQ-based not-at-cell-edge criterion for relaxed measurement
  • the supplementary configuration may include at least one offset for the RSRP/RSRQ-based not-at-cell-edge criterion.
  • the offset may be an offset to a threshold to evaluate not-at-cell-edge-criterion for relaxed measurement (e.g. legacy S SearchThresholdP2 ) or an offset to threshold to evaluate not-at-cell-edge-criterion for relaxed measurement (e.g. legacy S SearchThresholdQ2 ) .
  • the offset included in the supplementary configuration may be associated with one or more of a distance or variation of distance from the UE 201 to a point; a propagation delay or a timing advance (TA) or a variation of the propagation delay or the TA between the UE and the base station; or an elevation angle or a variation of the elevation angle between the UE and the base station.
  • TA timing advance
  • the base station 202 transmits 220 the first configuration and the second configuration 225 to the UE 201.
  • the first configuration may be carried in system information block 2 (SIB2)
  • the second configuration may be carried in SIB3, 4, 5, or SIB 19.
  • SIB2 system information block 2
  • SIB3 system information block 2
  • SIB3 system information block 3
  • the UE 201 performs 240 the relaxed measurement evaluation based on the first configuration and the second configuration.
  • the second configuration includes an indication associated with the neighbour cell measurement triggering or a supplementary configuration for the relaxed measurement evaluation.
  • the UE 201 may choose to ignore or disable the relaxed measurement evaluation based on the indication associated with the neighbour cell measurement triggering to avoid unnecessary evaluation (for Solution #1) .
  • the UE 201 may perform the relaxed measurement evaluation using the supplementary configuration to ensure accurate evaluation for relaxed measurement considering network characteristics (for Solutions #2 and #3) .
  • the indication associated with the neighbor cell measurement triggering may include the indication of time-based neighbour cell measurement triggering (e.g. a stop serving time, T-Service, or a feeder link switch time, T-FLswitch) .
  • the UE 201 may determine whether the neighbour cell measurement is required by fulfilment of a time-based criterion based on the indication of time-based neighbour cell measurement triggering. For example, when an interval between current time and the stop serving time or the feeder link switch time is less than a time threshold, i.e. the severing NTN cell is approaching end of service, the UE 201 may determine that the time-based criterion is fulfilled.
  • the UE 201 may ignore the relaxed measurement evaluation. If it is determined that the neighbour cell measurement is not required by the fulfilment of the time-based criterion, the UE 201 may continue the relaxed measurement evaluation.
  • the indication associated with the neighbor cell measurement triggering may include an indication of distance-based neighbour cell measurement triggering.
  • the indication of distance-based neighbour cell measurement triggering includes a reference location or a distance threshold.
  • the UE 201 may determine that the distance-based criterion is fulfilled when a distance from the UE 201 to the reference location is larger than the distance threshold.
  • the UE 201 may determine whether the neighbour cell measurement is required by a distance-based criterion based on the indication of distance-based neighbour cell measurement triggering. If it is determined that neighbour cell measurement is required by the fulfilment of the distance-based criterion, the UE 201 may ignore the relaxed measurement evaluation. Additionally or alternatively, if it is determined that the neighbour cell measurement is required by the fulfilment of the distance-based criterion and a serving NTN cell for the UE 201 is an earth-moving cell, the UE 201 may continue the relaxed measurement evaluation. Additionally or alternatively, if it is determined that the neighbour cell measurement is not required by the fulfilment of the distance-based criterion, the UE 201 may continue the relaxed measurement evaluation.
  • the UE 201 may determine whether the neighbour cell measurement is required by fulfilment of a RSRP/RSRQ-based criterion. If so, the UE 201 may continue the relaxed measurement evaluation with an offset applied to the first configuration. For example, the UE 201 may apply offset (s) to S searchDeltaP-Stationary and T searchDeltaP-Stationary of the RSRP-based stationary or low mobility criterion. Additionally or alternatively, the UE 201 may apply offset (s) to S SearchThresholdP2 and S SearchThresholdQ2 of the not-at-cell-edge-criterion.
  • the UE 201 may perform the relaxed measurement evaluation using the at least one criterion for stationary status evaluation included in the supplementary configuration.
  • the at least one criterion for stationary status evaluation may be a distance-variation-based criterion indicative of a threshold of variation of distance from the UE to a previous UE reference location, and the UE 201 may determine whether a variation of distance from the UE 201 to the previous UE reference location is smaller or no larger than first threshold for once or for a certain time duration. If so, the UE 201 may determine that the distance-variation-based criterion is fulfilled.
  • the distance-variation-based criterion may be indicative of a threshold of the variation of distance from the UE to a serving cell reference location.
  • the UE 201 may determine whether a variation of distance from the UE to the serving cell reference location is smaller or no larger than the threshold for once or for certain time duration. If so, the UE 201 may determine that the distance-variation-based criterion is fulfilled.
  • the distance-variation-based criterion may be indicative of a threshold of variation of distance from the UE 201 to a serving cell reference location minus an expected distance variation due to movement of an access node (e.g. a satellite) or the base station 202.
  • the UE 201 may determine whether a variation of distance from the UE 201 to the serving cell reference location minus the expected distance variation due to movement of the access node or the base station 202 is smaller or no larger than the threshold for once or for certain time duration. If so, the UE 201 may determine that the distance-variation-based criterion is fulfilled.
  • the distance-variation-based criterion may be indicative of a threshold of variation rate of distance from the UE to a serving cell reference location.
  • the UE 201 may determine whether a variation rate of distance from the UE to the serving cell reference location is smaller or no larger than the threshold for once or for certain time duration. If so, the UE 201 may determine that the distance-variation-based criterion is fulfilled.
  • the at least one criterion for stationary status evaluation include a terrestrial network (TN) -area-based criterion.
  • the TN-area-based criterion may be indicative of a threshold of variation of distance from the UE to at least one TN area reference location.
  • the UE 201 may determine whether a variation of distance from the UE 201 to the at least one TN area reference location is smaller or no larger than the threshold for once or for certain time duration. If so, the UE 201 may determine that the TN-area-based criterion is fulfilled.
  • the TN-area-based criterion may be indicative of a threshold of a fulfilment status of a distance-based criterion for at least one TN area.
  • the UE 201 may determine whether a variation of distance from the UE 201 to the at least one TN area reference location is smaller or no larger than the threshold for once or for certain time duration. If so, the UE 201 may determine that the TN-area-based criterion is fulfilled.
  • the at least one criterion for stationary status evaluation include a propagation-delay-variation-based criterion or a TA-delay-variation-based criterion.
  • the criterion may be indicative of a threshold of variation of propagation delay or TA between the UE 201 and the base station minus expected propagation delay or TA variation due to movement of an access node (e.g. a satellite) or the base station 202.
  • the UE 201 may determine whether a variation of the propagation delay or the TA between the UE 201 and the base station 202 minus the expected propagation delay or TA variation due to the movement of the access node or the base station is smaller or no larger than the threshold for once or for certain time duration. If so, the UE 201 may determine that the criterion is fulfilled.
  • the propagation-delay-variation-based criterion or the TA-delay-variation-based criterion may be indicative of a threshold of variation rate of propagation delay or TA between the UE and the base station.
  • the UE 201 may determine whether a variation rate of the propagation delay or the TA between the UE and the base station is smaller or no larger than the threshold for once or for certain time duration. If so, the UE 201 may determine that the criterion is fulfilled.
  • the at least one criterion for stationary status evaluation include an elevation-angle-variation-based criterion.
  • the criterion may be indicative of a threshold of variation of an elevation angle between the UE 201 and an access node (e.g. a satellite) or the base station minus an expected elevation angle variation due to movement of the access node or the base station.
  • the UE 201 may determine whether a variation of the elevation angle minus the expected elevation angle variation is smaller or no larger than the threshold for once or for certain time duration. If so, the UE 201 may determine that the criterion is fulfilled.
  • elevation-angle-variation-based criterion may be indicative of a threshold variation rate of the elevation angle between the UE and the access node or the base station.
  • the UE 201 may determine whether a variation rate of the elevation angle is smaller or no larger than the threshold for once or for certain time duration. If so, the UE 201 may determine that the criterion is fulfilled.
  • the UE 201 may perform the relaxed measurement evaluation with the at least one reference RSRP update rule in the supplementary configuration.
  • the RSRP update rule may include time duration for a guard timer. The UE 201 may prevent the update of the reference RSRP in the time duration, after starting the guard timer upon update of the reference RSRP. Additionally or alternatively, the RSRP update rule may include time duration for update of a reference RSRP. The UE 201 may update the reference RSRP only when a current RSRP is larger than the reference RSRP for the second time duration. Additionally or alternatively, the RSRP update rule may include an indication of ignoring update of the reference RSRP.
  • the UE 201 may ignore the update of the reference RSRP upon reception of the indication. Additionally or alternatively, the RSRP update rule may include an update threshold of the reference RSRP. The UE 201 may update the reference RSRP only when a difference between the current RSRP and the reference RSRP is equal to or larger than the update threshold.
  • the supplementary configuration may include at least one offset for the RSRP-based stationary or low mobility criterion for relaxed measurement.
  • the UE 201 may performing the stationary status evaluation based on the RSRP-based stationary or low mobility criterion with the at least one offset.
  • the at least one offset may include an offset to a threshold on RSRP variation to evaluate the RSRP-based stationary or low mobility criterion. Additionally or alternatively, the at least one offset may include an offset to a time period over which the RSRP variation is evaluated for stationary or low mobility criterion for relaxed measurement.
  • the supplementary configuration may include at least one criterion for not-at-cell-edge status evaluation.
  • the UE 201 may perform the relaxed measurement evaluation at least based on the at least one criterion for not-at-cell-edge status evaluation in the supplementary configuration.
  • the criterion for not-at-cell-edge status evaluation may include a distance-variation-based criterion indicative of a threshold of a distance from the UE 201 to a serving cell reference location.
  • the UE 201 may determine whether the distance from UE 201 to the serving cell reference location is smaller or no larger than the threshold for once or for certain time duration. If so, the UE 201 may determine that the distance-variation-based criterion is fulfilled.
  • the criterion for not-at-cell-edge status evaluation may include a propagation-delay-based or TA-based criterion indicative of a threshold of a propagation delay or a TA between the UE 201 and the base station 202.
  • the UE 201 may determine whether the propagation delay or the TA between UE 201 and the base station 202 is smaller or no larger than the threshold for once or for certain time duration. If so, the UE 201 may determine that the propagation-delay-based or TA-based criterion is fulfilled.
  • the criterion for not-at-cell-edge status evaluation may include an elevation-angle-based criterion indicative of a threshold of an elevation angle between the UE 201 and an access node or the base station 202.
  • the UE 201 may determine whether the elevation angle between UE 201 and the access node or the base station 202 is smaller or no larger than the threshold for once or for certain time duration. If so, the UE 201 may determine that the elevation-angle-based criterion is fulfilled.
  • logic of UE applying IDLE/INACTIVE relaxed measurement evaluation in NTN cell is modified considering NTN-specific triggering for neighbour cell measurement. ) .
  • UE may or may not perform the evaluations for relaxed measurement (i.e., on the stationary criterion or not-at-cell-edge criterion) when relaxed measurement criterion is broadcasted in, e.g., SIB2.
  • NTN-specific trigger In an NTN cell, if a neighbour cell measurement is required due to fulfillment of time-based criterion (NTN-specific trigger) , UE ignores relaxed measurement criterion broadcasted in SIB2, or disables/quits/suspends evaluation of any relaxed measurement criterion. In an NTN cell, if a neighbour cell measurement is required due to fulfillment of distance-based criterion (NTN-specific trigger) , UE may ignore relaxed measurement criterion broadcasted in SIB2, or disables/quits/suspends evaluation of any relaxed measurement criterion, e.g., ignore only for earth-moving cell, or consider not-at-cell-edge criterion as not fulfilled.
  • UE may continue to evaluate relaxed measurement criterion broadcasted in SIB2.
  • An offset for S SearchDeltaP- Stationary , T SearchDeltaP-Stationary , S SearchThresholdP2 or S SearchThresholdQ2 could be optionally applied.
  • additional stationary or low mobility criterion may be applied independently or combined with legacy criterions.
  • the additional stationary criterion (s) may include a distance-variation-based criterion, a terrestrial network (TN) -based criterion, a propagation-delay-variation-based or TA-variation-based criterion, and an elevation-angle-variation-based criterion.
  • Each of the criterions may be independent to or combined with legacy criterions.
  • the logic of the legacy stationary criterions may be modified by, for example, applying update rule (s) or offset (s) .
  • FIG. 3A illustrates an example of distance-variation-based criterion for stationary or low mobility evaluation.
  • the distance-variation-based criterion may include variation of distance from the UE to a previous UE reference location, for both quasi-earth-fixed and earth-moving cell. Additionally or alternatively, the distance-variation-based criterion may include variation of distance from the UE to the serving cell reference location, e.g., for quasi-earth-fixed cell.
  • FIG. 3B illustrates another example of distance-variation-based criterion for stationary or low mobility evaluation.
  • the distance-variation-based criterion may include variation of distance from the UE to a serving cell reference location minus an expected distance variation due to satellite movement, e.g., for an earth-moving cell.
  • the distance-variation-based criterion may include variation rate of distance from the UE to the serving cell reference location, for both quasi-earth-fixed and earth-moving cell.
  • FIG. 3C illustrates an example of TN-based criterion for stationary or low mobility evaluation.
  • the TN-based criterion may include variation of distance from the UE to at least one TN area reference location (if provided by network) . Additionally or alternatively, the TN-based criterion may include fulfilment status of distance-based criterion for at least one TN area regarding TN frequency measurement.
  • FIG. 3D illustrates an example of propagation-delay-variation-based or TA-variation-based criterion for stationary or low mobility evaluation.
  • the propagation-delay-variation-based or TA-variation-based criterion may include variation of propagation delay or TA between the UE and the satellite or the eNB/gNB minus an expected propagation delay or TA variation due to satellite movement, for both quasi-earth-fixed and earth-moving cell.
  • the criterion may include variation rate of propagation delay or TA between the UE and the satellite or eNB/gNB, for both quasi-earth-fixed and earth-moving cell.
  • FIG. 3E illustrates an example of elevation-angle-variation-based criterion.
  • the elevation-angle-variation-based criterion may include variation of an elevation angle between the UE and the satellite minus an expected elevation angle variation due to satellite movement, for both quasi-earth-fixed and earth-moving cell. Additionally or alternatively, the criterion may include variation rate of an elevation angle between the UE and the satellite, for both quasi-earth-fixed and earth-moving cell.
  • the logic of Srxlev RefStationary update may be modified.
  • the UE may start a guard timer upon update of Srxlev RefStationary to prevent further update when the timer is running.
  • the UE may update Srxlev RefStationary when (Srxlev -Srxlev RefStationary ) > 0 is fulfilled for T RefStationaryUpdate .
  • the UE may ignore Srxlev RefStationary update for when (Srxlev -Srxlev RefStationary ) > 0 is fulfilled.
  • the UE may update Srxlev RefStationary when
  • offset (s) for S SearchDeltaP-Stationary and/or T SearchDeltaP- Stationary may be applied.
  • the offset (s) may be applied to any NTN cell, NTN GEO cell, NTN LEO quasi-earth-fixed cell or NTN LEO earth-moving cell.
  • the offset (s) may be associated with distance or variation of distance from the UE to a point (serving cell reference point, previous UE location or TN area reference location) .
  • the offset (s) may be associated with propagation delay or TA or variation of propagation delay or TA between the UE and the satellite or the eNB/gNB.
  • the offset (s) may be associated with an elevation angle or variation of the elevation angle between the UE and the satellite.
  • criterion (s) to the UE’s not-at-cell-edge status evaluation for relaxed measurement in IDLE/INACTIVE may be introduced.
  • the criterions for not-at-cell-edge status evaluation may include a distance-based criterion.
  • the distance-based criterion may include a distance from the UE to a cell reference location.
  • the distance threshold can reuse the threshold in distance-based trigger for neighbour cell measurement or is separately defined as distanceThreshCellEdge.
  • the criterions for not-at-cell-edge status evaluation may include a propagation-delay-based or TA-based criterion, which includes the propagation delay or TA between the UE and the satellite or the eNB/gNB. Additionally or alternatively, the criterions for not-at-cell-edge status evaluation may include an elevation-angle-based criterion, which includes the elevation angle between the UE and the satellite.
  • a neighbour cell measurement may be triggered at the UE due to fulfillment of a time-based criterion, e.g., including that a quasi-earth-fixed NTN cell approaches its cell stop serving time (t-Service) or its feeder link switch time (t-FLswitch) , or an earth-moving NTN cell approaches its feeder link switch time (t-FLswitch) or its coverage leaves the UE location due to satellite movement.
  • a time-based criterion e.g., including that a quasi-earth-fixed NTN cell approaches its cell stop serving time (t-Service) or its feeder link switch time (t-FLswitch)
  • t-FLswitch feeder link switch time
  • t-FLswitch feeder link switch time
  • the UE may ignore the configuration of stationary status evaluation stationaryMobilityEvaluation (i.e., considers stationaryMobilityEvaluation as absent) . Additionally or alternatively, the UE may disables/quits/suspends stationary status evaluation for relaxed measurement. Additionally or alternatively, the UE may consider the stationary criterion for relaxed measurement as not fulfilled.
  • the UE may ignore the configuration of not-at-cell-edge status evaluation cellEdgeEvaluationWhileStationary (i.e., considers cellEdgeEvaluationWhileStationary as absent) . Additionally or alternatively, the UE may disables/quits/suspends not-at-cell-edge status evaluation for relaxed measurement. Additionally or alternatively, the UE may consider the not-at-cell-edge criterion for relaxed measurement as not fulfilled.
  • a neighbour cell measurement is triggered at the UE due to fulfillment of distance-based criterion, e.g., including that an earth-moving NTN cell’s coverage leaves the UE location due to satellite movement or the UE is leaving the NTN cell covered area due to UE movement.
  • the serving NTN cell broadcasts the configuration of stationary status evaluation stationaryMobilityEvaluation (i.e., relaxed measurement evaluation is enabled) . If the serving NTN cell is an earth-moving cell, the UE may ignore the configuration of stationary status evaluation stationaryMobilityEvaluation (i.e., considers stationaryMobilityEvaluation as absent) . Additionally or alternatively, the UE may disables/quits/suspends stationary status evaluation for relaxed measurement. Additionally or alternatively, the UE may consider the stationary criterion for relaxed measurement as not fulfilled. Else the UE may choose to continue stationary status evaluation for relaxed measurement.
  • stationary status evaluation stationaryMobilityEvaluation i.e., relaxed measurement evaluation is enabled
  • the UE may Ignore the configuration of not-at-cell-edge status evaluation cellEdgeEvaluationWhileStationary (i.e., considers cellEdgeEvaluationWhileStationary as absent) . Additionally or alternatively, the UE may disables/quits/suspends not-at-cell-edge status evaluation for relaxed measurement. Additionally or alternatively, the UE may consider the not-at-cell-edge criterion for relaxed measurement as not fulfilled.
  • a neighbour cell measurement is triggered at UE due to fulfillment of RSRP/RSRQ-based criterion. If the serving NTN cell broadcasts the configuration of stationary status evaluation stationaryMobilityEvaluation (i.e., relaxed measurement evaluation is enabled) , the UE may choose to continue stationary status evaluation for relaxed measurement. Additionally or alternatively, the UE may apply an offset to S SearchDeltaP- Stationary or T SearchDeltaP-Stationary during the stationary status evaluation for relaxed measurement.
  • the offset may be associated to at least one of the following: a distance or a variation of distance from the UE to a point, a propagation delay or a TA or variation of the propagation delay or the TA between UE and the satellite or an eNB/gNB, or an elevation angle or variation of the elevation angle between the UE and the satellite.
  • the UE may choose to continue not-at-cell-edge status evaluation for relaxed measurement. Additionally or alternatively, the UE may apply an offset to S SearchThresholdP2 or S SearchThresholdQ2 during the not-at-cell-edge status evaluation for relaxed measurement.
  • the offset may be associated to at least one of the following: a distance or a variation of distance from the UE to a point, a propagation delay or a TA or variation of the propagation delay or the TA between the UE and a satellite or an eNB/gNB, or an elevation angle or variation of the elevation angle between the UE and the satellite.
  • an NTN cell broadcasts a supplementary configuration of stationary status evaluation including at least one criterion which may be configured together with or without the RSRP-variation-based criterion stationaryMobilityEvaluation.
  • the at least one criterion may include one or more of a distance-variation-based criterion, a TN-area-based criterion, a propagation-delay-variation-based or TA-variation-based criterion, or an elevation-angle-variation-based criterion.
  • the distance-variation-based criterion may include one or more of: at least one threshold of the variation of distance from UE to previous UE reference location, at least one threshold of the variation of distance from UE to serving cell reference location, at least one threshold of the variation of distance from UE to serving cell reference location minus expected distance variation due to satellite movement; at least one threshold of the variation rate of distance from UE to serving cell reference location.
  • the TN-area-based criterion may include one or more of: at least one threshold of the variation of distance from UE to at least one TN area reference location, and at least one threshold of the fulfilment status of distance-based criterion for at least one TN area.
  • the propagation-delay-variation-based or TA-variation-based criterion may include one or more of: at least one threshold of the variation of propagation delay or TA between the UE and the satellite or the eNB/gNB minus an expected propagation delay or TA variation due to satellite movement, and at least one threshold of the variation rate of the propagation delay or TA between the UE and the satellite or the eNB/gNB.
  • the elevation-angle-variation-based criterion may include one or more of: at least one threshold of the variation of the elevation angle between the UE and the satellite minus expected an elevation angle variation due to satellite movement, and at least one threshold of the variation rate of elevation angle between the UE and the satellite.
  • the UE may perform stationary status evaluation based on at least one of the above criteria in the configuration.
  • the UE may consider the distance-variation-based criterion as fulfilled when the variation of distance from the UE to the previous UE reference location is smaller or no larger than at least one threshold of the variation of distance from the UE to the previous UE reference location, for once or for certain time duration if configured.
  • the UE may consider the distance-variation-based criterion as fulfilled when the variation of distance from the UE to the serving cell reference location is smaller or no larger than the at least one threshold of the variation of distance from the UE to the serving cell reference location, for once or for certain time duration if configured.
  • the UE may consider the distance-variation-based criterion as fulfilled when the variation of distance from the UE to the serving cell reference location minus the expected distance variation due to the satellite movement is smaller or no larger than at least one threshold of the variation of distance from the UE to the serving cell reference location minus the expected distance variation due to satellite movement, for once or for a certain time duration if configured. In some embodiments, the UE may consider the distance-variation-based criterion as fulfilled when the variation rate of distance from the UE to the serving cell reference location is smaller or no larger than the at least one threshold of the variation rate of distance from the UE to the serving cell reference location, for once or for a certain time duration if configured.
  • the UE may consider the TN-area-based criterion as fulfilled when the variation of distance from the UE to the at least one TN area reference location is smaller or no larger than the at least one threshold of the variation of distance from the UE to the at least one TN area reference location, for once or for a certain time duration if configured. In some embodiments, the UE may consider the TN-area-based criterion as fulfilled when the variation of distance from the UE to the at least one TN area reference location is smaller or no larger than the at least one threshold of the fulfilment status of distance-based criterion for the at least one TN area, for once or for a certain time duration if configured.
  • the UE may consider the propagation-delay-variation-based or TA-variation-based criterion as fulfilled when the variation of propagation delay or TA between the UE and the satellite or the eNB/gNB minus the expected propagation delay or TA variation due to satellite movement is smaller or no larger than the at least one threshold of the variation of propagation delay or TA between the UE and the satellite or the eNB/gNB minus the expected propagation delay or TA variation due to satellite movement, for once or for a certain time duration if configured.
  • the UE may consider the propagation-delay-variation-based or TA-variation-based criterion as fulfilled when the variation rate of propagation delay or TA between the UE and the satellite or the eNB/gNB is smaller or no larger than the at least one threshold of the variation rate of propagation delay or TA between the UE and the satellite or the eNB/gNB, for once or for a certain time duration if configured.
  • the UE may consider the elevation-angle-variation-based criterion as fulfilled when the variation of the elevation angle between the UE and the satellite minus the expected elevation angle variation due to satellite movement is smaller or no larger than the at least one threshold of the variation of the elevation angle between the UE and the satellite minus the expected elevation angle variation due to satellite movement, for once or for a certain time duration if configured.
  • the UE may consider the elevation-angle-variation-based criterion as fulfilled when the variation rate of elevation angle between the UE and the satellite is smaller or no larger than the at least one threshold of the variation rate of elevation angle between the UE and the satellite, for once or for a certain time duration if configured.
  • an NTN cell broadcasts a supplementary configuration to the configuration of stationary status evaluation stationaryMobilityEvaluation.
  • the supplementary configuration may include at least one of the following: a time duration for a guard timer, a time duration T RefStationaryUpdate for update of Srxlev RefStationary due to (Srxlev -Srxlev RefStationary ) > 0, an indication of ignoring update of Srxlev RefStationary due to (Srxlev -Srxlev RefStationary ) > 0, and a update threshold Srxlev RefStationaryUpdate for update of Srxlev RefStationary .
  • the UE performs stationary status evaluation based on the supplementary configuration.
  • the UE may start a guard timer upon update of Srxlev RefStationary , with length of the time duration if configured, wherein Srxlev RefStationary is not updated when the guard timer is running.
  • the UE may update Srxlev RefStationary when (Srxlev -Srxlev RefStationary ) > 0 is fulfilled for T RefStationaryUpdate if configured.
  • the UE may ignore Srxlev RefStationary update for when (Srxlev -Srxlev RefStationary ) > 0 is fulfilled.
  • the UE may update Srxlev RefStationary when
  • an NTN cell broadcasts a supplementary configuration to the configuration of stationary status evaluation stationaryMobilityEvaluation.
  • the supplementary configuration may include at least one of the following: an offset to S SearchDeltaP-Stationary , and an offset to T SearchDeltaP-Stationary .
  • Both of the offsets may be associated with at least one of the following: a distance or a variation of distance from the UE to a point; a propagation delay or TA or a variation of propagation delay or TA between the UE and the satellite or the eNB/gNB; or an elevation angle or a variation of the elevation angle between the UE and the satellite.
  • an NTN cell broadcasts a supplementary configuration of not-at-cell-edge status evaluation including at least one criterion which may be configured together with or without the RSRP/RSRQ-based criterion cellEdgeEvaluationWhileStationary.
  • the at least one criterion may include at least one of the following: a distance-based criterion, which may include at least one threshold of the distance from the UE to a serving cell reference location, a propagation-delay-based or TA-based criterion, which may include at least one threshold of the propagation delay or TA between the UE and the satellite or eNB/gNB; and an elevation-angle-based criterion, which may include at least one threshold of the elevation angle between the UE and the satellite.
  • a distance-based criterion which may include at least one threshold of the distance from the UE to a serving cell reference location
  • a propagation-delay-based or TA-based criterion which may include at least one threshold of the propagation delay or TA between the UE and the satellite or eNB/gNB
  • an elevation-angle-based criterion which may include at least one threshold of the elevation angle between the UE and the satellite.
  • the UE may perform not-at-cell-edge status evaluation based on at least one of the above criteria in the configuration.
  • the UE may consider the distance-based criterion as fulfilled when the distance from the UE to the serving cell reference location is smaller or no larger than the at least one threshold of the distance from the UE to the serving cell reference location, for once or for a certain time duration if configured.
  • the UE may consider the propagation-delay-based or TA-based criterion as fulfilled when the propagation delay or TA between the UE and the satellite or the eNB/gNB is smaller or no larger than the at least one threshold of the propagation delay or TA between the UE and the satellite or the eNB/gNB, for once or for a certain time duration if configured.
  • the UE may consider the elevation-angle-variation-based criterion as fulfilled when the elevation angle between the UE and the satellite is smaller or no larger than the at least one threshold of the elevation angle between UE and satellite, for once or for a certain time duration if configured.
  • FIG. 4 illustrates another example of a process flow in accordance with some example embodiments of the present disclosure.
  • the process flow 400 may involve a user equipment (UE) 201 and a base station 202.
  • the process flow 200 may be applied to the wireless communications system 100 with reference to FIG. 1, for example, the UE 201 may be a UE 104 and the base station 202 may be a network entity 102. It would be appreciated that the process flow 200 may be applied to other communication scenarios, which will not be described in detail.
  • the UE 201 receives from the base station a first configuration for relaxed measurement evaluation and a second configuration associated to neighbour cell measurement in NTN.
  • the UE 201 performs evaluation for relaxed measurement based on the first configuration and the second configuration.
  • the first configuration includes RSRP-variation-based stationary status criterion stationaryMobilityEvaluation and optionally RSRP/RSRQ-based not-at-cell-edge status criterion cellEdgeEvaluationWhileStationary.
  • the second configuration associated with neighbour cell measurement in NTN includes at least one of the following: indication of time-based neighbour cell measurement triggering; indication of distance-based neighbour cell measurement triggering; and supplementary configuration for relaxed measurement evaluation.
  • the indication of time-based neighbour cell measurement triggering in the second configuration at least includes one of t-Service and t-FLswitch for neighbour cell measurement triggering in NTN
  • the indication of distance-based neighbour cell measurement triggering in the second configuration at least includes one of referenceLocation and distanceThresh for neighbour cell measurement triggering in NTN.
  • the UE 201 may choose to ignore/disable stationary and/or not-at-cell-edge status evaluation for relaxed measurement when neighbour cell measurement is triggered at 408 by time-based criterion. If the second configuration includes indication of distance-based neighbour cell measurement triggering, then at 410 the UE 210 may choose to ignore/disable stationary and/or not-at-cell-edge status evaluation for relaxed measurement when neighbour cell measurement is triggered at 408 by distance-based criterion. At 410, the UE 201 may choose to continue stationary and/or not-at-cell-edge status evaluation with offset applied for relaxed measurement when neighbour cell measurement is triggered at 408 by RSRP/RSRQ-based criterion.
  • the UE performs stationary status evaluation based on new criterion. If the supplementary configuration for relaxed measurement evaluation in the second configuration includes reference RSRP update rules, then at 412 the UE performs stationary status evaluation with additional reference RSRP update rules. If the supplementary configuration for relaxed measurement evaluation in the second configuration includes offsets to RSRP-variation-based stationary status criterion stationaryMobilityEvaluation, then at 412 the UE 201 performs stationary status evaluation with offsets applied to RSRP-variation-based stationary status criterion stationaryMobilityEvaluation. If the supplementary configuration for relaxed measurement evaluation in the second configuration includes new criterion for not-at- cell-edge status evaluation, then at 414 the UE 201 performs not-at-cell-edge status evaluation based on new criterion.
  • the base station 202 determines a first configuration for relaxed measurement evaluation and a second configuration associated to neighbour cell measurement in NTN.
  • the base station 202 transmits the first configuration and the second configuration to the UE 201.
  • the first configuration includes RSRP-variation-based stationary status criterion stationaryMobilityEvaluation and optionally RSRP/RSRQ-based not-at-cell-edge status criterion cellEdgeEvaluationWhileStationary.
  • the second configuration associated with neighbour cell measurement in NTN includes at least one of the following: indication of time-based neighbour cell measurement triggering; indication of distance-based neighbour cell measurement triggering; and supplementary configuration for relaxed measurement evaluation.
  • the indication of time-based neighbour cell measurement triggering in the second configuration at least includes one of t-Service and t-FLswitch, and the indication of distance-based neighbour cell measurement triggering in the second configuration at least includes one of referenceLocation and distanceThresh.
  • the supplementary configuration for relaxed measurement evaluation in the second configuration may include new criterion for stationary status evaluation. Additionally or alternatively, the supplementary configuration for relaxed measurement evaluation in the second configuration may include reference RSRP update rules. Additionally or alternatively, the supplementary configuration for relaxed measurement evaluation in the second configuration may include offsets to RSRP-variation-based stationary status criterion stationaryMobilityEvaluation. Additionally or alternatively, the supplementary configuration for relaxed measurement evaluation in the second configuration includes new criterion for not-at-cell-edge status evaluation.
  • a first configuration for relaxed measurements and second configuration for neighbour cell measurement are provided from the base station to the UE.
  • the second configuration includes an indication associated with the neighbour cell measurement triggering or a supplementary configuration for the relaxed measurement evaluation.
  • the UE may perform relaxed measurement evaluation based on the first configuration and the second configuration. As such, the UE may avoid unnecessary evaluation and ensure accurate evaluation for relaxed measurement considering network characteristics.
  • FIG. 5 illustrates an example of a device that is suitable for implementing some embodiments of the present disclosure.
  • the device 500 may be an example of a UE 104 as described herein.
  • the device 500 may support wireless communication with one or more network entities 102, UEs 104, or any combination thereof.
  • the device 500 may include components for bi-directional communications including components for transmitting and receiving communications, such as a processor 502, a memory 504, a transceiver 506, and, optionally, an I/O controller 508. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) .
  • interfaces e.g., buses
  • the processor 502, the memory 504, the transceiver 506, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein.
  • the processor 502, the memory 504, the transceiver 506, or various combinations or components thereof may support a method for performing one or more of the operations described herein.
  • the processor 502, the memory 504, the transceiver 506, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry) .
  • the hardware may include a processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure.
  • the processor 502 and the memory 504 coupled with the processor 502 may be configured to perform one or more of the functions described herein (e.g., executing, by the processor 502, instructions stored in the memory 504) .
  • the processor 502 may support wireless communication at the device 500 in accordance with examples as disclosed herein.
  • the processor 502 may be configured to operable to support means for receiving, from a base station, a first configuration for relaxed measurement evaluation and a second configuration for neighbour cell measurement, wherein the second configuration includes an indication associated with the neighbour cell measurement triggering or a supplementary configuration for the relaxed measurement evaluation; and means for performing the relaxed measurement evaluation based on the first configuration and the second configuration.
  • the processor 502 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) .
  • the processor 502 may be configured to operate a memory array using a memory controller.
  • a memory controller may be integrated into the processor 502.
  • the processor 502 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 504) to cause the device 500 to perform various functions of the present disclosure.
  • the memory 504 may include random access memory (RAM) and read-only memory (ROM) .
  • the memory 504 may store computer-readable, computer-executable code including instructions that, when executed by the processor 502 cause the device 500 to perform various functions described herein.
  • the code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory.
  • the code may not be directly executable by the processor 502 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.
  • the memory 504 may include, among other things, a basic I/O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.
  • BIOS basic I/O system
  • the I/O controller 508 may manage input and output signals for the device 500.
  • the I/O controller 508 may also manage peripherals not integrated into the device 500.
  • the I/O controller 508 may represent a physical connection or port to an external peripheral.
  • the I/O controller 508 may utilize an operating system such as or another known operating system.
  • the I/O controller 508 may be implemented as part of a processor, such as the processor 506.
  • a user may interact with the device 500 via the I/O controller 508 or via hardware components controlled by the I/O controller 508.
  • the device 500 may include a single antenna 510. However, in some other implementations, the device 500 may have more than one antenna 510 (i.e., multiple antennas) , including multiple antenna panels or antenna arrays, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.
  • the transceiver 506 may communicate bi-directionally, via the one or more antennas 510, wired, or wireless links as described herein.
  • the transceiver 506 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver.
  • the transceiver 506 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 510 for transmission, and to demodulate packets received from the one or more antennas 510.
  • the transceiver 506 may include one or more transmit chains, one or more receive chains, or a combination thereof.
  • a transmit chain may be configured to generate and transmit signals (e.g., control information, data, packets) .
  • the transmit chain may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium.
  • the at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM) , frequency modulation (FM) , or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM) .
  • the transmit chain may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium.
  • the transmit chain may also include one or more antennas 510 for transmitting the amplified signal into the air or wireless medium.
  • a receive chain may be configured to receive signals (e.g., control information, data, packets) over a wireless medium.
  • the receive chain may include one or more antennas 510 for receive the signal over the air or wireless medium.
  • the receive chain may include at least one amplifier (e.g., a low-noise amplifier (LNA) ) configured to amplify the received signal.
  • the receive chain may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal.
  • the receive chain may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.
  • FIG. 6 illustrates an example of a processor 600 is suitable for implementing some embodiments of the present disclosure.
  • the processor 600 may be an example of a processor configured to perform various operations in accordance with examples as described herein.
  • the processor 600 may include a controller 602 configured to perform various operations in accordance with examples as described herein.
  • the processor 600 may optionally include at least one memory 604. Additionally, or alternatively, the processor 600 may optionally include one or more arithmetic-logic units (ALUs) 600.
  • ALUs arithmetic-logic units
  • One or more of these components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) .
  • the processor 600 may be a processor chipset and include a protocol stack (e.g., a software stack) executed by the processor chipset to perform various operations (e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) in accordance with examples as described herein.
  • a protocol stack e.g., a software stack
  • operations e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading
  • the processor chipset may include one or more cores, one or more caches (e.g., memory local to or included in the processor chipset (e.g., the processor 600) or other memory (e.g., random access memory (RAM) , read-only memory (ROM) , dynamic RAM (DRAM) , synchronous dynamic RAM (SDRAM) , static RAM (SRAM) , ferroelectric RAM (FeRAM) , magnetic RAM (MRAM) , resistive RAM (RRAM) , flash memory, phase change memory (PCM) , and others) .
  • RAM random access memory
  • ROM read-only memory
  • DRAM dynamic RAM
  • SDRAM synchronous dynamic RAM
  • SRAM static RAM
  • FeRAM ferroelectric RAM
  • MRAM magnetic RAM
  • RRAM resistive RAM
  • PCM phase change memory
  • the controller 602 may be configured to manage and coordinate various operations (e.g., signaling, receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) of the processor 600 to cause the processor 600 to support various operations in accordance with examples as described herein.
  • the controller 602 may operate as a control unit of the processor 600, generating control signals that manage the operation of various components of the processor 600. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.
  • the controller 602 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 604 and determine subsequent instruction (s) to be executed to cause the processor 600 to support various operations in accordance with examples as described herein.
  • the controller 602 may be configured to track memory address of instructions associated with the memory 604.
  • the controller 602 may be configured to decode instructions to determine the operation to be performed and the operands involved.
  • the controller 602 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 600 to cause the processor 600 to support various operations in accordance with examples as described herein.
  • the controller 602 may be configured to manage flow of data within the processor 600.
  • the controller 602 may be configured to control transfer of data between registers, arithmetic logic units (ALUs) , and other functional units of the processor 600.
  • ALUs arithmetic logic units
  • the memory 604 may include one or more caches (e.g., memory local to or included in the processor 600 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementation, the memory 604 may reside within or on a processor chipset (e.g., local to the processor 600) . In some other implementations, the memory 604 may reside external to the processor chipset (e.g., remote to the processor 600) .
  • caches e.g., memory local to or included in the processor 600 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc.
  • the memory 604 may reside within or on a processor chipset (e.g., local to the processor 600) . In some other implementations, the memory 604 may reside external to the processor chipset (e.g., remote to the processor 600) .
  • the memory 604 may store computer-readable, computer-executable code including instructions that, when executed by the processor 600, cause the processor 600 to perform various functions described herein.
  • the code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory.
  • the controller 602 and/or the processor 600 may be configured to execute computer-readable instructions stored in the memory 604 to cause the processor 600 to perform various functions (e.g., functions or tasks supporting transmit power prioritization ) .
  • the processor 600 and/or the controller 602 may be coupled with or to the memory 604, the processor 600, the controller 602, and the memory 604 may be configured to perform various functions described herein.
  • the processor 600 may include multiple processors and the memory 604 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein.
  • the one or more ALUs 606 may be configured to support various operations in accordance with examples as described herein.
  • the one or more ALUs 606 may reside within or on a processor chipset (e.g., the processor 600) .
  • the one or more ALUs 606 may reside external to the processor chipset (e.g., the processor 600) .
  • One or more ALUs 606 may perform one or more computations such as addition, subtraction, multiplication, and division on data.
  • one or more ALUs 606 may receive input operands and an operation code, which determines an operation to be executed.
  • One or more ALUs 606 be configured with a variety of logical and arithmetic circuits, including adders, subtractors, shifters, and logic gates, to process and manipulate the data according to the operation. Additionally, or alternatively, the one or more ALUs 606 may support logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 606 to handle conditional operations, comparisons, and bitwise operations.
  • logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 606 to handle conditional operations, comparisons, and bitwise operations.
  • the processor 600 may support wireless communication in accordance with examples as disclosed herein.
  • the processor 602 may be configured to or operable to support means for receiving, from a base station, a first configuration for relaxed measurement evaluation and a second configuration for neighbour cell measurement, wherein the second configuration includes an indication associated with the neighbour cell measurement triggering or a supplementary configuration for the relaxed measurement evaluation; and means for performing the relaxed measurement evaluation based on the first configuration and the second configuration.
  • the processor 602 may be configured to operable to support means for determining a first configuration for relaxed measurement evaluation and a second configuration for neighbour cell measurement, wherein the second configuration includes an indication associated with the neighbour cell measurement triggering or a supplementary configuration for the relaxed measurement evaluation, and means for transmitting the first configuration and the second configuration to a UE.
  • FIG. 7 illustrates another example of a device that is suitable for implementing some embodiments of the present disclosure.
  • the device 700 may be an example of a network entity 102 as described herein.
  • the device 700 may support wireless communication with one or more network entities 102, UEs 104, or any combination thereof.
  • the device 700 may include components for bi-directional communications including components for transmitting and receiving communications, such as a processor 702, a memory 704, a transceiver 706, and, optionally, an I/O controller 708. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) .
  • interfaces e.g., buses
  • the processor 702, the memory 704, the transceiver 706, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein.
  • the processor 702, the memory 704, the transceiver 706, or various combinations or components thereof may support a method for performing one or more of the operations described herein.
  • the processor 702, the memory 704, the transceiver 706, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry) .
  • the hardware may include a processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure.
  • the processor 702 and the memory 704 coupled with the processor 702 may be configured to perform one or more of the functions described herein (e.g., executing, by the processor 702, instructions stored in the memory 704) .
  • the processor 702 may support wireless communication at the device 700 in accordance with examples as disclosed herein.
  • the processor 502 may be configured to operable to support means for determining a first configuration for relaxed measurement evaluation and a second configuration for neighbour cell measurement, wherein the second configuration includes an indication associated with the neighbour cell measurement triggering or a supplementary configuration for the relaxed measurement evaluation, and means for transmitting the first configuration and the second configuration to a UE.
  • the processor 702 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) .
  • the processor 702 may be configured to operate a memory array using a memory controller.
  • a memory controller may be integrated into the processor 702.
  • the processor 702 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 704) to cause the device 700 to perform various functions of the present disclosure.
  • the memory 704 may include random access memory (RAM) and read-only memory (ROM) .
  • the memory 704 may store computer-readable, computer-executable code including instructions that, when executed by the processor 702 cause the device 700 to perform various functions described herein.
  • the code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory.
  • the code may not be directly executable by the processor 702 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.
  • the memory 704 may include, among other things, a basic I/O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.
  • BIOS basic I/O system
  • the I/O controller 708 may manage input and output signals for the device 700.
  • the I/O controller 708 may also manage peripherals not integrated into the device 700.
  • the I/O controller 708 may represent a physical connection or port to an external peripheral.
  • the I/O controller 708 may utilize an operating system such as or another known operating system.
  • the I/O controller 708 may be implemented as part of a processor, such as the processor 702.
  • a user may interact with the device 700 via the I/O controller 708 or via hardware components controlled by the I/O controller 708.
  • the device 700 may include a single antenna 710. However, in some other implementations, the device 700 may have more than one antenna 710 (i.e., multiple antennas) , including multiple antenna panels or antenna arrays, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.
  • the transceiver 706 may communicate bi-directionally, via the one or more antennas 710, wired, or wireless links as described herein.
  • the transceiver 706 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver.
  • the transceiver 706 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 710 for transmission, and to demodulate packets received from the one or more antennas 710.
  • the transceiver 706 may include one or more transmit chains, one or more receive chains, or a combination thereof.
  • a transmit chain may be configured to generate and transmit signals (e.g., control information, data, packets) .
  • the transmit chain may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium.
  • the at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM) , frequency modulation (FM) , or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM) .
  • the transmit chain may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium.
  • the transmit chain may also include one or more antennas 710 for transmitting the amplified signal into the air or wireless medium.
  • a receive chain may be configured to receive signals (e.g., control information, data, packets) over a wireless medium.
  • the receive chain may include one or more antennas 710 for receive the signal over the air or wireless medium.
  • the receive chain may include at least one amplifier (e.g., a low-noise amplifier (LNA) ) configured to amplify the received signal.
  • the receive chain may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal.
  • the receive chain may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.
  • FIG. 8 illustrates an example of a processor 800 is suitable for implementing some embodiments of the present disclosure.
  • the processor 800 may be an example of a processor configured to perform various operations in accordance with examples as described herein.
  • the processor 800 may include a controller 802 configured to perform various operations in accordance with examples as described herein.
  • the processor 800 may optionally include at least one memory 804. Additionally, or alternatively, the processor 800 may optionally include one or more arithmetic-logic units (ALUs) 800.
  • ALUs arithmetic-logic units
  • the processor 800 may be a processor chipset and include a protocol stack (e.g., a software stack) executed by the processor chipset to perform various operations (e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) in accordance with examples as described herein.
  • a protocol stack e.g., a software stack
  • operations e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading
  • the processor chipset may include one or more cores, one or more caches (e.g., memory local to or included in the processor chipset (e.g., the processor 800) or other memory (e.g., random access memory (RAM) , read-only memory (ROM) , dynamic RAM (DRAM) , synchronous dynamic RAM (SDRAM) , static RAM (SRAM) , ferroelectric RAM (FeRAM) , magnetic RAM (MRAM) , resistive RAM (RRAM) , flash memory, phase change memory (PCM) , and others) .
  • RAM random access memory
  • ROM read-only memory
  • DRAM dynamic RAM
  • SDRAM synchronous dynamic RAM
  • SRAM static RAM
  • FeRAM ferroelectric RAM
  • MRAM magnetic RAM
  • RRAM resistive RAM
  • PCM phase change memory
  • the controller 802 may be configured to manage and coordinate various operations (e.g., signaling, receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) of the processor 800 to cause the processor 800 to support various operations in accordance with examples as described herein.
  • the controller 802 may operate as a control unit of the processor 800, generating control signals that manage the operation of various components of the processor 800. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.
  • the controller 802 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 804 and determine subsequent instruction (s) to be executed to cause the processor 800 to support various operations in accordance with examples as described herein.
  • the controller 802 may be configured to track memory address of instructions associated with the memory 804.
  • the controller 802 may be configured to decode instructions to determine the operation to be performed and the operands involved.
  • the controller 802 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 800 to cause the processor 800 to support various operations in accordance with examples as described herein.
  • the controller 802 may be configured to manage flow of data within the processor 800.
  • the controller 802 may be configured to control transfer of data between registers, arithmetic logic units (ALUs) , and other functional units of the processor 800.
  • ALUs arithmetic logic units
  • the memory 804 may include one or more caches (e.g., memory local to or included in the processor 800 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementation, the memory 804 may reside within or on a processor chipset (e.g., local to the processor 800) . In some other implementations, the memory 804 may reside external to the processor chipset (e.g., remote to the processor 800) .
  • caches e.g., memory local to or included in the processor 800 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc.
  • the memory 804 may reside within or on a processor chipset (e.g., local to the processor 800) . In some other implementations, the memory 804 may reside external to the processor chipset (e.g., remote to the processor 800) .
  • the memory 804 may store computer-readable, computer-executable code including instructions that, when executed by the processor 800, cause the processor 800 to perform various functions described herein.
  • the code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory.
  • the controller 802 and/or the processor 800 may be configured to execute computer-readable instructions stored in the memory 804 to cause the processor 800 to perform various functions (e.g., functions or tasks supporting transmit power prioritization) .
  • the processor 800 and/or the controller 802 may be coupled with or to the memory 804, the processor 800, the controller 802, and the memory 804 may be configured to perform various functions described herein.
  • the processor 800 may include multiple processors and the memory 804 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein.
  • the one or more ALUs 806 may be configured to support various operations in accordance with examples as described herein.
  • the one or more ALUs 806 may reside within or on a processor chipset (e.g., the processor 800) .
  • the one or more ALUs 806 may reside external to the processor chipset (e.g., the processor 800) .
  • One or more ALUs 806 may perform one or more computations such as addition, subtraction, multiplication, and division on data.
  • one or more ALUs 806 may receive input operands and an operation code, which determines an operation to be executed.
  • One or more ALUs 806 be configured with a variety of logical and arithmetic circuits, including adders, subtractors, shifters, and logic gates, to process and manipulate the data according to the operation. Additionally, or alternatively, the one or more ALUs 806 may support logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 806 to handle conditional operations, comparisons, and bitwise operations.
  • logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 806 to handle conditional operations, comparisons, and bitwise operations.
  • the processor 800 may support wireless communication in accordance with examples as disclosed herein.
  • the processor 802 may be configured to operable to support means for determining a first configuration for relaxed measurement evaluation and a second configuration for neighbour cell measurement, wherein the second configuration includes an indication associated with the neighbour cell measurement triggering or a supplementary configuration for the relaxed measurement evaluation, and means for transmitting the first configuration and the second configuration to a UE.
  • FIG. 9 illustrates a flowchart of a method 900 performed by a UE in accordance with aspects of the present disclosure.
  • the operations of the method 900 may be implemented by a device or its components as described herein.
  • the operations of the method 900 may be performed by a UE 104 as described herein.
  • the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.
  • the method may include receiving, from a base station, a first configuration for relaxed measurement evaluation and a second configuration for neighbour cell measurement, wherein the second configuration includes an indication associated with the neighbour cell measurement triggering or a supplementary configuration for the relaxed measurement evaluation.
  • the operations of 910 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 910 may be performed by a UE 104 as described with reference to FIG. 1.
  • the method may include performing the relaxed measurement evaluation based on the first configuration and the second configuration.
  • the operations of 720 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 920 may be performed by a UE 104 as described with reference to FIG. 1.
  • the first configuration may include at least one of: a reference-signal-received-power (RSRP) -based stationary or low mobility criterion for relaxed measurement; or a RSRP/reference-signal-received-quality (RSRQ) -based not-at-cell-edge criterion for relaxed measurement.
  • RSRP reference-signal-received-power
  • RSRQ reference-signal-received-quality
  • the indication associated with the neighbor cell measurement triggering may include one of: an indication of time-based neighbour cell measurement triggering, or an indication of distance-based neighbour cell measurement triggering.
  • the UE may determine whether the neighbour cell measurement is required by fulfilment of a time-based criterion based on the indication of time-based neighbour cell measurement triggering; and perform one of the following: based on determining that the neighbour cell measurement is required by the fulfilment of the time-based criterion, ignoring the relaxed measurement evaluation; or based on determining that the neighbour cell measurement is not required by the fulfilment of the time-based criterion, continuing the relaxed measurement evaluation.
  • the indication of time-based neighbour cell measurement triggering may include one of a stop serving time or a feeder link switch time of a serving non-terrestrial network (NTN) cell.
  • NTN serving non-terrestrial network
  • the time-based criterion may be fulfilled when an interval between current time and the stop serving time or the feeder link switch time is less than a time threshold.
  • the UE may determine whether the neighbour cell measurement is required by a distance-based criterion based on the indication of distance-based neighbour cell measurement triggering; and perform one of the following: based on determining that neighbour cell measurement is required by the fulfilment of the distance-based criterion, ignoring the relaxed measurement evaluation; based on determining that the neighbour cell measurement is required by the fulfilment of the distance-based criterion and a serving NTN cell for the UE is an earth-moving cell, continuing the relaxed measurement evaluation; or based on determining that the neighbour cell measurement is not required by the fulfilment of the distance-based criterion, continuing the relaxed measurement evaluation.
  • the indication of distance-based neighbour cell measurement triggering may include a reference location or a distance threshold.
  • the distance-based criterion may be fulfilled when a distance from the UE to the reference location is larger than the distance threshold.
  • the UE may continue the relaxed measurement evaluation with an offset applied to the first configuration based on determining that the neighbour cell measurement is required by fulfilment of a RSRP/RSRQ-based criterion.
  • the supplementary configuration for the relaxed measurement evaluation may include at least one criterion for stationary status evaluation, and the processor is configured to perform the relaxed measurement evaluation using the at least one criterion for stationary status evaluation.
  • the at least one criterion for stationary status evaluation includes a distance-variation-based criterion indicative of one of the following: a first threshold of variation of distance from the UE to a previous UE reference location, a second threshold of the variation of distance from the UE to a serving cell reference location, a third threshold of variation of distance from the UE to a serving cell reference location minus an expected distance variation due to movement of an access node or the base station, or a fourth threshold of variation rate of distance from the UE to a serving cell reference location.
  • performing the relaxed measurement evaluation may comprise determining the distance-variation-based criterion is fulfilled based on determining one of the following: a variation of distance from the UE to the previous UE reference location is smaller or no larger than the first threshold for once or for a certain time duration; a variation of distance from the UE to the serving cell reference location is smaller or no larger than the second threshold for once or for a certain time duration; a variation of distance from the UE to the serving cell reference location minus the expected distance variation due to movement of the access node or the base station is smaller or no larger than the third threshold for once or for a certain time duration; or a variation rate of distance from the UE to the serving cell reference location is smaller or no larger than the fourth threshold for once or for a certain time duration.
  • the at least one criterion for stationary status evaluation may include a terrestrial network (TN) -area-based criterion indicative of one of the following: a fifth threshold of variation of distance from the UE to at least one TN area reference location, or a sixth threshold of a fulfilment status of a distance-based criterion for at least one TN area.
  • TN terrestrial network
  • performing the relaxed measurement evaluation may comprise: determining the TN-area-based criterion is fulfilled based on determining one of the following: a variation of distance from the UE to the at least one TN area reference location is smaller or no larger than the fifth threshold for once or for a certain time duration; or a variation of distance from the UE to the at least one TN area reference location is smaller or no larger than the sixth threshold for once or for a certain time duration.
  • the at least one criterion for stationary status evaluation may include a propagation-delay-variation-based criterion or a TA-delay-variation-based criterion indicative of one of the following: a seventh threshold of variation of propagation delay or TA between the UE and the base station minus expected propagation delay or TA variation due to movement of an access node or the base station, or an eighth threshold of variation rate of propagation delay or TA between the UE and the base station.
  • performing the relaxed measurement evaluation may comprise: determining the propagation-delay-variation-based criterion or the TA-delay-variation-based criterion is fulfilled based on determining one of the following: a variation of the propagation delay or the TA between the UE and the base station minus the expected propagation delay or TA variation due to the movement of the access node or the base station is smaller or no larger than the seventh threshold for once or for a certain time duration; or a variation rate of the propagation delay or the TA between the UE and the base station is smaller or no larger than the eighth threshold for once or for a certain time duration.
  • the at least one criterion for stationary status evaluation may include an elevation-angle-variation-based criterion indicative of one of the following: a ninth threshold of variation of an elevation angle between the UE and an access node or the base station minus an expected elevation angle variation due to movement of the access node or the base station, or a tenth threshold of variation rate of the elevation angle between the UE and the access node or the base station.
  • performing the relaxed measurement evaluation may comprise: determining the elevation-angle-variation-based criterion is fulfilled based on determining one of the following: a variation of the elevation angle between the UE and the base station minus the expected elevation angle variation due to the movement of the access node or the base station is smaller or no larger than the ninth threshold for once or for a certain time duration; or a variation rate of the elevation angle between the UE and the access node or the base station is smaller or no larger than the tenth threshold for once or for a certain time duration if configured.
  • the supplementary configuration for the relaxed measurement evaluation may include at least one reference RSRP update rule, and the processor is configured to perform the relaxed measurement evaluation with the at least one reference RSRP update rule.
  • the at least one reference RSRP update rule may include one of the following: a first time duration for a guard timer; a second time duration for update of a reference RSRP; an indication of ignoring update of the reference RSRP, or an update threshold of the reference RSRP.
  • performing the relaxed measurement evaluation may comprise one of the following: after starting the guard timer upon update of the reference RSRP, preventing the update of the reference RSRP in the first time duration; updating the reference RSRP based on determining that a current RSRP is larger than the reference RSRP for the second time duration; ignoring the update of the reference RSRP upon reception of the indication; or updating the reference RSRP based on determining that a difference between the current RSRP and the reference RSRP is equal to or larger than the update threshold.
  • the first configuration may include a RSRP-based stationary or low mobility criterion for relaxed measurement
  • the supplementary configuration may include at least one offset for the RSRP-based stationary or low mobility criterion for relaxed measurement
  • performing the relaxed measurement evaluation may comprise performing stationary status evaluation based on the RSRP-based stationary or low mobility criterion with the at least one offset.
  • the at least one offset may include one of the following an offset to a threshold on RSRP variation to evaluate the RSRP-based stationary or low mobility criterion; or an offset to a time period over which the RSRP variation is evaluated for stationary or low mobility criterion for relaxed measurement.
  • the at least one offset is associated with one of the following: a distance or variation of distance from the UE to a point; a propagation delay or a timing advance (TA) or a variation of the propagation delay or the TA between the UE and the base station; or an elevation angle or a variation of the elevation angle between the UE and an access node or the base station.
  • TA timing advance
  • the supplementary configuration may include at least one criterion for not-at-cell-edge status evaluation, and the UE may perform the relaxed measurement evaluation at least based on the at least one criterion for not-at-cell-edge status evaluation.
  • the at least one criterion for not-at-cell-edge status evaluation may include a distance-variation-based criterion indicative of an eleventh threshold of a distance from the UE to a serving cell reference location, and performing the relaxed measurement evaluation may comprise: determining that the distance-variation-based criterion is fulfilled based on determining that the distance from UE to the serving cell reference location is smaller or no larger than the eleventh threshold for once or for a certain time duration.
  • the at least one criterion for not-at-cell-edge status evaluation may include a propagation-delay-based or TA-based criterion indicative of a twelfth threshold of a propagation delay or a TA between the UE and the base station
  • performing the relaxed measurement evaluation may comprise: determining that the propagation-delay-based or TA-based criterion is fulfilled based on determining that the propagation delay or the TA between UE and the base station is smaller or no larger than the twelfth threshold for once or for a certain time duration.
  • the at least one criterion for not-at-cell-edge status evaluation may include an elevation-angle-based criterion indicative of a thirteenth threshold of an elevation angle between the UE and an access node or the base station, and performing the relaxed measurement evaluation may comprise: determining that the elevation-angle-based criterion is fulfilled based on determining that the elevation angle between UE and the access node or the base station is smaller or no larger than the thirteenth threshold for once or for a certain time duration.
  • the UE may be a reduced capability (Redcap) UE.
  • Redcap reduced capability
  • FIG. 10 illustrates a flowchart of a method 1000 performed by a base station in accordance with aspects of the present disclosure.
  • the operations of the method 1000 may be implemented by a device or its components as described herein.
  • the operations of the method 1000 may be performed by a network entity 102 as described herein.
  • the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.
  • the method may include determining a first configuration for relaxed measurement evaluation and a second configuration for neighbour cell measurement, wherein the second configuration includes an indication associated with the neighbour cell measurement triggering or a supplementary configuration for the relaxed measurement evaluation.
  • the operations of 1010 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1010 may be performed by a network entity 102 as described with reference to FIG. 1.
  • the method may include transmitting the first configuration and the second configuration to a UE.
  • the operations of 1020 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1020 may be performed by a network entity 102 as described with reference to FIG. 1.
  • the first configuration may include at least one of: a reference-signal-received-power (RSRP) -based stationary or low mobility criterion for relaxed measurement, or a RSRP/reference-signal-received-quality (RSRQ) -based not-at-cell-edge criterion for relaxed measurement.
  • RSRP reference-signal-received-power
  • RSRQ reference-signal-received-quality
  • the indication associated with the neighbor cell measurement triggering may include one of: an indication of time-based neighbour cell measurement triggering, or an indication of distance-based neighbour cell measurement triggering.
  • the indication of time-based neighbour cell measurement triggering may include one of a stop serving time or a feeder link switch time of a serving non-terrestrial network (NTN) cell.
  • NTN serving non-terrestrial network
  • the indication of distance-based neighbour cell measurement triggering may include a reference location or a distance threshold.
  • the supplementary configuration for the relaxed measurement evaluation may include at least one criterion for stationary status evaluation.
  • the at least one criterion for stationary status evaluation may include a distance-variation-based criterion indicative of one of the following: a first threshold of variation of distance from the UE to a previous UE reference location, a second threshold of the variation of distance from the UE to a serving cell reference location, a third threshold of variation of distance from the UE to a serving cell reference location minus an expected distance variation due to movement of an access node or the base station, or a fourth threshold of variation rate of distance from the UE to a serving cell reference location.
  • the at least one criterion for stationary status evaluation may include a terrestrial network (TN) -area-based criterion indicative of one of the following: a fifth threshold of variation of distance from the UE to at least one TN area reference location, or a sixth threshold of a fulfilment status of a distance-based criterion for at least one TN area.
  • TN terrestrial network
  • the at least one criterion for stationary status evaluation may include a propagation-delay-variation-based criterion or a TA-delay-variation-based criterion indicative of one of the following: a seventh threshold of variation of propagation delay or TA between the UE and the base station minus expected propagation delay or TA variation due to movement of an access node or the base station, or an eighth threshold of variation rate of propagation delay or TA between the UE and the base station.
  • the at least one criterion for stationary status evaluation may include an elevation-angle-variation-based criterion indicative of one of the following: a ninth threshold of variation of an elevation angle between the UE and an access node or the base station minus an expected elevation angle variation due to movement of the access node or the base station, or a tenth threshold of variation rate of the elevation angle between the UE and the access node or the base station.
  • the supplementary configuration for the relaxed measurement evaluation may include at least one reference RSRP update rule.
  • the at least one reference RSRP update rule may include one of the following: a first time duration for a guard timer; a second time duration for update of a reference RSRP; an indication of ignoring update of the reference RSRP, or an update threshold of the reference RSRP.
  • the first configuration includes a RSRP-based stationary or low mobility criterion for relaxed measurement and the supplementary configuration may include at least one offset for the RSRP-based stationary or low mobility criterion for relaxed measurement.
  • the at least one offset may include one of the following: an offset to a threshold on RSRP variation to evaluate the RSRP-based stationary or low mobility criterion; or an offset to a time period over which the RSRP variation is evaluated for stationary or low mobility criterion for relaxed measurement.
  • the at least one offset may be associated with one of the following: a distance or variation of distance from the UE to a point; a propagation delay or a timing advance (TA) or a variation of the propagation delay or the TA between the UE and the base station; or an elevation angle or a variation of the elevation angle between the UE and an access node or the base station.
  • TA timing advance
  • the supplementary configuration may include at least one criterion for not-at-cell-edge status evaluation.
  • the at least one criterion for not-at-cell-edge status evaluation may include one of the following: a distance-variation-based criterion indicative of an eleventh threshold of a distance from the UE to a serving cell reference location; a propagation-delay-based or TA-based criterion indicative of a twelfth threshold of a propagation delay or a TA between the UE and the base station; or an elevation-angle-variation-based criterion indicative of a thirteenth threshold of an elevation angle between the UE and an access node or the base station.
  • the base station may be located at a satellite or communicate with the UE via a satellite.
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • the functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
  • Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer.
  • non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.
  • an article “a” before an element is unrestricted and understood to refer to “at least one” of those elements or “one or more” of those elements.
  • the terms “a, ” “at least one, ” “one or more, ” and “at least one of one or more” may be interchangeable.
  • a list of items indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) .
  • the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure.
  • the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on.
  • a “set” may include one or more elements.

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

Abstract

Divers aspects de la présente divulgation concernent un UE, une station de base, des processeurs pour une communication sans fil, des procédés et un support lisible par ordinateur pour une mesure relâchée améliorée. Selon un aspect, un UE reçoit d'une station de base une première configuration pour une évaluation de mesure relâchée et une seconde configuration pour une mesure de cellule voisine, la seconde configuration comprenant une indication associée au déclenchement de mesure de cellule voisine ou à une configuration supplémentaire pour l'évaluation de mesure relâchée. L'UE effectue l'évaluation de mesure relâchée sur la base de la première configuration et de la seconde configuration. De cette manière, l'UE peut éviter une évaluation inutile et assurer une évaluation précise pour une mesure relâchée en tenant compte des caractéristiques de réseau.
PCT/CN2023/105143 2023-06-30 2023-06-30 Mesure relâchée améliorée WO2024093327A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115004771A (zh) * 2020-01-23 2022-09-02 三星电子株式会社 无线通信系统中放松rrm测量的方法和装置
US20220377635A1 (en) * 2019-10-04 2022-11-24 Nokia Technologies Oy Apparatus, method and computer program for adjusting radio resource management measurements
WO2022252184A1 (fr) * 2021-06-03 2022-12-08 Oppo广东移动通信有限公司 Procédé et appareil de traitement de mesure, et support de stockage
WO2023004965A1 (fr) * 2021-07-30 2023-02-02 展讯通信（上海）有限公司 Procédé et appareil de mesure de cellule voisine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220377635A1 (en) * 2019-10-04 2022-11-24 Nokia Technologies Oy Apparatus, method and computer program for adjusting radio resource management measurements
CN115004771A (zh) * 2020-01-23 2022-09-02 三星电子株式会社 无线通信系统中放松rrm测量的方法和装置
WO2022252184A1 (fr) * 2021-06-03 2022-12-08 Oppo广东移动通信有限公司 Procédé et appareil de traitement de mesure, et support de stockage
WO2023004965A1 (fr) * 2021-07-30 2023-02-02 展讯通信（上海）有限公司 Procédé et appareil de mesure de cellule voisine

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Title
LENOVO, MOTOROLA MOBILITY: "RRM relaxation for stationary UE with reduced capability", 3GPP DRAFT; R2-2009877, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. electronic; 20201102 - 20201113, 23 October 2020 (2020-10-23), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051942679 *

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