Method and apparatus for conditional handover in non-terrestrial networks

Abstract

Disclosed are methods and apparatus for conditional handover in a non-terrestrial network (NTN). An embodiment of the present application provides a user equipment (UE). The UE includes a processor and a wireless transceiver coupled to the processor. The processor is configured to at least receive a conditional handover (CHO) configuration and a CHO execution condition for a target cell using the wireless transceiver, where the CHO execution condition includes a time-based event and at least one measurement-based event, or a location-based event and at least one measurement-based event, and evaluate whether the CHO execution condition is satisfied.

Description

[Technical Field]

[0001] The present disclosure relates generally to wireless communication technologies, and more particularly to a method and apparatus for conditional handover (CHO) in a non-terrestrial based network (NTN). [Background technology]

[0002] CHO plays an important role in reducing delays and interruptions, ensuring business continuity while a user equipment (UE) is moving, and / or reducing the number of failures that occur while a user is moving. In CHO, instead of preparing one target cell as in the conventional case, multiple candidate target cells are prepared in advance in the network, which allows the CHO command to be sent to the UE earlier than in a normal handover, when radio conditions are still good, rather than when conditions start to deteriorate as in a conventional handover. Along with the command, the UE also receives the CHO configuration and monitored CHO execution conditions. When the CHO execution conditions are met, the UE first sends a measurement report (which may fail to be sent) and then applies the previously stored CHO command as if the network had just sent it, instead of waiting to receive the command (which may fail to be received).

[0003] On the network side, when it is uncertain whether the UE will access a particular target cell, the serving node can prepare one or more target "candidate" cells. The CHO preparation procedure has some similarities to the handover preparation procedure, except that the target node does not expect the UE to access it immediately, or in some cases, even at all, and the result is the generation of a CHO command (i.e., an RRCReconfiguration message containing the configuration of the target cell).

[0004] The Mobility Robustness Optimization (MRO) feature of New Radio (NR) may be enhanced to provide more robust mobility by reporting any available information observed during a Radio Link Failure (RLF) or during a CHO or handover (HO). Upon receiving this available information, the network can analyze whether its mobility configuration requires adjustment. Such adjustment may result in a change to the mobility configuration, such as a change to the Radio Link Management (RLM) configuration or a change to the mobility threshold between the source and target nodes. Summary of the Invention [Means for solving the problem]

[0005] Various embodiments and methods of the present disclosure provide solutions related to CHO in NTNs.

[0006] According to some embodiments of the present disclosure, an exemplary UE is provided, the UE including: a processor; and a wireless transceiver coupled to the processor, the processor configured to at least receive, using the wireless transceiver, a CHO configuration and a CHO execution condition for a target cell, where the CHO execution condition includes a time-based event and at least one measurement-based event, or a location-based event and at least one measurement-based event, and evaluate whether the CHO execution condition is satisfied.

[0007] In some embodiments, each of the at least one measurement-based event is a CondEvent A3, a CondEvent A4, or a CondEvent A5.

[0008] In some embodiments, the CHO execution condition includes a time-based event and at least one measurement-based event, where the time-based event corresponds to a time window, and the time window is configured as a first threshold and a CHO timer related to the start of the time window, where the length of the CHO timer is equal to the length of the time window, the first threshold and a duration of the time window, or the first threshold and a second threshold related to the end of the time window. In some embodiments, the time-based event is satisfied if the current time is within the time window.

[0009] In some embodiments, in response to the fact that the time window is configured as a first threshold and a duration, the time-based event further includes an entry condition, and the entry condition for the time-based event is the inequality that the current time is greater than the first threshold and the current time is less than the first threshold plus the configured duration value.

[0010] In some embodiments, in response to the fact that the time window is configured as a first threshold and a duration, the time-based event further includes a leaving condition, and the leaving condition of the time-based event is an inequality that the current time is less than the first threshold or the current time is greater than the first threshold plus the configured duration value.

[0011] In some embodiments, in response to the fact that the time window is configured as a first threshold and a second threshold, the time-based event further includes a participation condition, and the participation condition of the time-based event is an inequality that the current time is greater than the first threshold and the current time is less than the second threshold.

[0012] In some embodiments, in response to the fact that the time window is configured as a first threshold and a second threshold, the time-based event further includes an exit condition, and the exit condition of the time-based event is an inequality that the current time is less than the first threshold or the current time is greater than the second threshold.

[0013] In some embodiments, in response to the fact that the time window is configured as a first threshold value relative to the start of the time window and a CHO timer, the processor is further configured to start the CHO timer in response to the fact that the time point at which the first threshold value is received is greater than the first threshold value for the start of the time window.

[0014] In some embodiments, in response to the fact that the time window is configured as a first threshold value relative to a start of the time window and a CHO timer, the processor is further configured to start the CHO timer in response to the fact that the time point at which the first threshold value is received is greater than the first threshold value for the start of the time window and less than the end of the time window.

[0015] In some embodiments, in response to the fact that the time point at which the first threshold value is received is greater than the first threshold value of the start of the time window, the processor is further configured to set the length of the CHO timer as one of the configured length of the CHO timer minus the time difference between the first threshold value and the time point and the configured length of the CHO timer.

[0016] In some embodiments, in response to the fact that the time point at which the first threshold value is received is greater than the first threshold value at the start of the time window and less than the end of the time window, the processor is further configured to set the length of the CHO timer as one of the configured length of the CHO timer minus the time difference between the first threshold value and the time point and the configured length of the CHO timer.

[0017] In some embodiments, the time window is configured as a first threshold value relative to a start of the time window and a CHO timer, and in response to the fact that the time point at which the first threshold value is received is greater than the first threshold value of the time window, the processor is further configured to not start the CHO timer, or to start the CHO timer and immediately stop the CHO timer.

[0018] In some embodiments, depending on the fact that the time window is configured as a first threshold value related to the start of the time window and a duration of the time window, or the time window is configured as a first threshold value related to the start of the time window and a second threshold value related to the end of the time window, the time-based event further comprises an entry condition and / or an exit condition.

[0019] In some embodiments, to evaluate whether the time-based event is met in response to the fact that the time window is configured as a first threshold value relative to a start of the time window and a duration of the time window, the processor is further configured to determine that the time-based event is met in response to the fact that the joining condition is met and / or the leaving condition is not met.

[0020] In some embodiments, the processor is further configured to, in response to the fact that the time point at which the first threshold value is received is greater than the first threshold value, set the duration as one of the configured duration value minus the time difference between the first threshold value and the time point and the configured duration value.

[0021] In some embodiments, in response to the fact that the time point at which the first threshold value is received is greater than the first threshold value, the processor is further configured to ignore the CHO execution condition, discard the CHO execution condition, and retain the CHO configuration.

[0022] In some embodiments, in response to the fact that the time point at which the first threshold value is received is greater than the first threshold value, the processor is further configured to transmit, using the wireless transceiver, an indication to indicate that the time point is greater than the first threshold value.

[0023] In some embodiments, the processor is further configured to declare an RLF, perform a re-establishment procedure due to the RLF, and transmit RLF information to the re-established cell using the wireless transceiver, wherein the RLF information includes at least one of an indication of whether the at least one measurement-based event is met or not met within the time window, the at least one met measurement-based event within the time window, an indication of whether the at least one measurement-based event is met or not met before the time window, an indication of whether the at least one measurement-based event is met or not met after the time window, an indication of a time difference between two measurement-based events of the at least one measurement-based event that are met within the time window depending on the fact that at least two measurement-based events are configured, or a measurement result at the end of the time window.

[0024] In some embodiments, the processor is further configured to declare an RLF, perform a re-establishment procedure due to the RLF, and transmit RLF information to the re-established cell using the wireless transceiver, wherein, in response to a fact that the CHO execution condition includes a location-based event and at least one measurement-based event, the RLF information includes at least one of: an indication indicating whether the at least one measurement-based event is met or not met when the UE is in a configured location; the at least one met measurement-based event when the UE is in a configured location; an indication indicating whether the at least one measurement-based event is met or not met before the UE enters the configured location; an indication indicating whether the at least one measurement-based event is met after the UE leaves the configured location; in response to a fact that at least two measurement-based events are configured, an indication indicating a time difference between two measurement-based events of the at least one measurement-based event that is met when the UE is in a configured location; or a measurement result when the UE leaves the configured location, wherein the location-based event is met if the UE is in a configured location.

[0025] In some embodiments, the processor is further configured to receive, using the wireless transceiver, at least one successful handover report (SHR) trigger condition for reporting a successful handover report after the CHO or HO, the at least one SHR trigger condition including at least one of: a physical layer problem timer running at the beginning of a time window; an elapsed time value of the physical layer problem timer being greater than a first configured value of the physical layer problem timer multiplied by a third threshold when the time-based event is satisfied; a timer for initiating fault recovery based on triggering a measurement report running at the beginning of the time window; an elapsed time value of the timer for initiating fault recovery based on triggering a measurement report being greater than a second configured value of the timer for initiating fault recovery based on triggering a measurement report multiplied by a fourth threshold when the timer-based event is satisfied; or, in response to the fact that at least two measurement-based events are configured, a time difference between two measurement-based events of the at least one measurement-based event that is satisfied within the time window exceeds a fifth threshold.

[0026] In some embodiments, the processor is further configured to perform HO or CHO and report the SHR to the target cell in response to at least one trigger condition for reporting the SHR being satisfied, the SHR including: an indication indicating whether a physical layer problem timer is running at a beginning of a time window; an indication indicating whether a timer for initiating failure recovery based on triggering a measurement report is running at a beginning of the time window; an indication indicating whether the physical layer problem timer is running at an end of the time window; an indication indicating whether a timer for initiating failure recovery based on triggering a measurement report is running at an end of the time window; an indication indicating whether the at least one measurement-based event is met or not met before the time window; an indication indicating whether the at least one measurement-based event is met or not met after the time window; depending on the fact that at least two measurement-based events are configured, an indication indicating a time difference between two measurement-based events of the at least one measurement-based event that are met within the time window; or a measurement result when performing CHO or HO.

[0027] In some embodiments, the processor is further configured to receive, using the wireless transceiver, at least one SHR trigger condition for reporting an SHR after a CHO or HO, wherein the CHO execution condition includes a location-based event and at least one measurement-based event, and the at least one SHR trigger condition includes at least one of: a physical layer problem timer running upon entering the configured location; an elapsed time value of the physical layer problem timer being greater than a first configured value of the physical layer problem timer multiplied by a third threshold when the location-based event is satisfied; a timer for initiating fault recovery based on triggering a measurement report running upon entering the configured location; an elapsed time value of the timer for initiating fault recovery based on triggering a measurement report being greater than a second configured value of the timer for initiating fault recovery based on triggering a measurement report multiplied by a fourth threshold when the location-based event is satisfied; or, in response to the fact that at least two measurement-based events are configured, a time difference between two measurement-based events of the at least one measurement-based event that are satisfied within a time window exceeds a fifth threshold.

[0028] In some embodiments, the processor is further configured to perform HO or CHO and report the SHR to the target cell using the wireless transceiver in response to a fact that at least one SHR trigger condition for reporting the SHR is satisfied, the SHR including: an indication indicating whether a physical layer problem timer is running when the UE enters a configured location; an indication indicating whether a timer for initiating failure recovery based on triggering a measurement report is running when the UE enters a configured location; an indication indicating whether a physical layer problem timer is running when the UE leaves a configured location; an indication indicating whether a timer for initiating failure recovery based on triggering a measurement report is running when the UE leaves a configured location; an indication indicating whether at least one SHR trigger condition for reporting the SHR is satisfied after the HO or CHO is performed. The information includes at least one of one SHR condition, an indication indicating whether at least one measurement-based event is met or not met when the UE is within the configured location, an indication indicating whether at least one measurement-based event is met or not met before the UE enters the configured location, an indication indicating whether at least one measurement-based event is met or not met after the UE leaves the configured location, an indication indicating a time difference between two measurement-based events among the at least one measurement-based event that is met when the UE is within the configured location in response to at least two measurement-based events being configured, or a measurement result when the UE performs CHO or HO, where the location-based event is met if the UE is within the configured location.

[0029] According to some embodiments of the present disclosure, an exemplary base station (BS) is provided, the BS including: a processor; and a wireless transceiver coupled to the processor, the processor configured to: transmit, using the wireless transceiver, a reconfiguration message including at least a CHO configuration and a CHO execution condition for a target cell, the CHO execution condition including a time-based event and at least one measurement-based event, or a location-based event and at least one measurement-based event.

[0030] In some embodiments, each of the at least one measurement-based event is a CondEvent A3, a CondEvent A4, or a CondEvent A5.

[0031] In some embodiments, the CHO execution condition includes a time-based event and at least one measurement-based event, where the time-based event is met if the current time is within a time window, and the time window is configured as a first threshold and a CHO timer having a length, a first threshold and a duration, or a first threshold and a second threshold.

[0032] In some embodiments, the processor is further configured to receive, using the wireless transceiver, an indication that the UE receives the first threshold value after the first threshold value.

[0033] In some embodiments, the processor is further configured to transmit, using the wireless transceiver, at least one SHR trigger condition for reporting an SHR after a CHO or HO, wherein the at least one SHR trigger condition for reporting an SHR includes at least one of: a physical layer problem timer running at the beginning of a time window; an elapsed time value of the physical layer problem timer being greater than a first configured value of the physical layer problem timer multiplied by a third threshold when the time-based event is satisfied; a timer for initiating fault recovery based on triggering a measurement report running at the beginning of the time window; an elapsed time value of the timer for initiating fault recovery based on triggering a measurement report being greater than a second configured value of the timer for initiating fault recovery based on triggering a measurement report multiplied by a fourth threshold when the time-based event is satisfied; or, in response to the fact that at least two measurement-based events are configured, a time difference between two measurement-based events of the at least one measurement-based event that is satisfied within the time window exceeds a fifth threshold.

[0034] In some embodiments, the processor is further configured to transmit, using the wireless transceiver, at least one SHR trigger condition for reporting an SHR after a CHO or HO, wherein the CHO execution condition includes a location-based event and at least one measurement-based event, and the at least one SHR trigger condition for reporting an SHR includes at least one of: a physical layer problem timer running upon entering the configured location; an elapsed time value of the physical layer problem timer being greater than a first configured value of the physical layer problem timer multiplied by a third threshold when the location-based event is satisfied; a timer for initiating fault recovery based on triggering a measurement report running upon entering the configured location; an elapsed time value of the timer for initiating fault recovery based on triggering a measurement report being greater than a second configured value of the timer for initiating fault recovery based on triggering a measurement report multiplied by a fourth threshold when the location-based event is satisfied; or, in response to the fact that at least two measurement-based events are configured, a time difference between two measurement-based events of the at least one measurement-based event that are satisfied within a time window exceeds a fifth threshold.

[0035] According to some embodiments of the present disclosure, an exemplary method performed by a UE is provided, the method including at least receiving a conditional handover (CHO) configuration and a CHO execution condition for a target cell, where the CHO execution condition includes a time-based event and at least one measurement-based event, or a location-based event and at least one measurement-based event, and evaluating whether the CHO execution condition is satisfied.

[0036] In some embodiments, each of the at least one measurement-based event is a CondEvent A3, a CondEvent A4, or a CondEvent A5.

[0037] In some embodiments, the CHO execution condition includes a time-based event and at least one measurement-based event, wherein the time-based event corresponds to a time window, and the time window is configured as a first threshold and a CHO timer related to the start of the time window, wherein the length of the CHO timer is equal to the length of the time window, the first threshold and the CHO timer related to the start of the time window and the duration of the time window, or the first threshold and the start of the time window and a second threshold related to the end of the time window. In some embodiments, the time-based event is satisfied if the current time is within the time window.

[0038] In some embodiments, in response to the fact that the time window is configured as a first threshold and a duration, the time-based event further includes a participation condition, and the participation condition of the time-based event is the inequality that the current time is greater than the first threshold and the current time is less than the first threshold plus the configured duration value.

[0039] In some embodiments, in response to the fact that the time window is configured as a first threshold and a duration, the time-based event further includes an exit condition, and the exit condition of the time-based event is an inequality that the current time is less than the first threshold or the current time is greater than the first threshold plus the configured duration value.

[0040] In some embodiments, in response to the fact that the time window is configured as a first threshold and a second threshold, the time-based event further includes a participation condition, and the participation condition of the time-based event is an inequality that the current time is greater than the first threshold and the current time is less than the second threshold.

[0041] In some embodiments, in response to the fact that the time window is configured as a first threshold and a second threshold, the time-based event further includes an exit condition, and the exit condition of the time-based event is an inequality that the current time is less than the first threshold or the current time is greater than the second threshold.

[0042] In some embodiments, in response to the fact that the time window is configured as a first threshold value for the start of the time window and a CHO timer, the method further includes starting the CHO timer in response to the fact that the time point at which the first threshold value is received is greater than the first threshold value for the start of the time window.

[0043] In some embodiments, in response to the fact that the time window is configured as a first threshold value for the start of the time window and a CHO timer, the method further comprises starting the CHO timer in response to the fact that the time point at which the first threshold value is received is greater than the first threshold value for the start of the time window and less than the end of the time window.

[0044] In some embodiments, in response to the fact that the time point at which the first threshold value is received is greater than the first threshold value of the start of the time window, the method further includes setting the length of the CHO timer as one of the configured length of the CHO timer minus the time difference between the first threshold value and the time point and the configured length of the CHO timer.

[0045] In some embodiments, in response to the fact that the time point at which the first threshold value is received is greater than the first threshold value at the start of the time window and less than the end of the time window, the method further includes setting the length of the CHO timer to one of the configured length of the CHO timer minus the time difference between the first threshold value and the time point and the configured length of the CHO timer.

[0046] In some embodiments, the time window is configured as a first threshold value relative to the start of the time window and a CHO timer, and in response to the fact that the time point at which the first threshold value is received is greater than the first threshold value of the time window, the method further includes a step of not starting the CHO timer, or starting the CHO timer and immediately stopping the CHO timer.

[0047] In some embodiments, depending on the fact that the time window is configured as a first threshold value related to the start of the time window and a duration of the time window, or the time window is configured as a first threshold value related to the start of the time window and a second threshold value related to the end of the time window, the time-based event further comprises an entry condition and / or an exit condition.

[0048] In some embodiments, evaluating whether the time-based event is met further includes determining that the time-based event is met in response to the fact that the join condition is met and / or the leave condition is not met.

[0049] In some embodiments, the method further includes setting the duration as one of the configured duration value minus the time difference between the first threshold and the time point, in response to the fact that the time point at which the first threshold is received is greater than the first threshold value.

[0050] In some embodiments, in response to the fact that the time point at which the first threshold value is received is greater than the first threshold value, the method further includes the steps of ignoring the CHO execution condition and discarding the CHO execution condition and retaining the CHO configuration.

[0051] In some embodiments, in response to the fact that the time point at which the first threshold value is received is greater than the first threshold value, the method further includes transmitting an indication to indicate that the time point is greater than the first threshold value.

[0052] In some embodiments, the method further includes declaring an RLF, performing a re-establishment procedure due to the RLF, and transmitting RLF information to the re-established cell, wherein the RLF information includes at least one of an indication of whether the at least one measurement-based event is met or not met within the time window, the at least one met measurement-based event within the time window, an indication of whether the at least one measurement-based event is met or not met before the time window, an indication of whether the at least one measurement-based event is met or not met after the time window, an indication of a time difference between two measurement-based events of the at least one measurement-based event that are met within the time window depending on the fact that at least two measurement-based events are configured, or a measurement result at the end of the time window.

[0053] In some embodiments, the method further includes the steps of declaring RLF, performing a re-establishment procedure due to the RLF, and transmitting RLF information to the re-established cell, wherein, depending on whether the CHO execution condition includes a location-based event and at least one measurement-based event, the RLF information includes at least one of: an indication indicating whether the at least one measurement-based event is met or not met when the UE is in a configured location; the at least one met measurement-based event when the UE is in a configured location; an indication indicating whether the at least one measurement-based event is met or not met before the UE enters the configured location; an indication indicating whether the at least one measurement-based event is met after the UE leaves the configured location; depending on whether at least two measurement-based events are configured, an indication indicating a time difference between two measurement-based events of the at least one measurement-based event that is met when the UE is in a configured location; or a measurement result when the UE leaves the configured location, where the location-based event is met if the UE is in a configured location.

[0054] In some embodiments, the method further includes receiving at least one SHR trigger condition for reporting an SHR after a CHO or HO, wherein the at least one SHR trigger condition includes at least one of: a physical layer problem timer running at the beginning of a time window; an elapsed time value of the physical layer problem timer being greater than a first configured value of the physical layer problem timer multiplied by a third threshold when the time-based event is satisfied; a timer for initiating fault recovery based on triggering a measurement report running at the beginning of the time window; an elapsed time value of the timer for initiating fault recovery based on triggering a measurement report being greater than a second configured value of the timer for initiating fault recovery based on triggering a measurement report multiplied by a fourth threshold when the timer-based event is satisfied; or, in response to the fact that at least two measurement-based events are configured, a time difference between two measurement-based events of the at least one measurement-based event that is satisfied within the time window exceeds a fifth threshold.

[0055] In some embodiments, the method further includes the steps of performing HO or CHO, and reporting the SHR to the target cell in response to at least one SHR trigger condition for reporting the SHR being satisfied, wherein the SHR includes: an indication indicating whether a physical layer problem timer is running at the beginning of a time window; an indication indicating whether a timer for initiating failure recovery based on triggering a measurement report is running at the beginning of the time window; an indication indicating whether the physical layer problem timer is running at the end of the time window; an indication indicating whether a timer for initiating failure recovery based on triggering a measurement report is running at the end of the time window; an indication indicating whether at least one measurement-based event is met or not met before the time window; an indication indicating whether at least one measurement-based event is met or not met after the time window; an indication indicating a time difference between two measurement-based events among the at least one measurement-based event that is met within the time window depending on the fact that at least two measurement-based events are configured; or a measurement result when performing CHO or HO.

[0056] In some embodiments, the method further includes receiving at least one SHR trigger condition for reporting an SHR after a CHO or HO, wherein the CHO execution condition includes a location-based event and at least one measurement-based event, and the at least one SHR trigger condition includes at least one of: a physical layer problem timer running upon entering the configured location; an elapsed time value of the physical layer problem timer being greater than a first configured value of the physical layer problem timer multiplied by a third threshold when the location-based event is satisfied; a timer for initiating fault recovery based on triggering a measurement report running upon entering the configured location; an elapsed time value of the timer for initiating fault recovery based on triggering a measurement report being greater than a second configured value of the timer for initiating fault recovery based on triggering a measurement report multiplied by a fourth threshold when the location-based event is satisfied; or, in response to the fact that at least two measurement-based events are configured, a time difference between two measurement-based events of the at least one measurement-based event that are satisfied within a time window exceeds a fifth threshold.

[0057] In some embodiments, the method further includes the steps of performing HO or CHO, and reporting the SHR to the target cell in response to at least one SHR triggering condition for reporting the SHR being met, wherein the SHR includes: an indication indicating whether a physical layer problem timer is running when the UE enters a configured location; an indication indicating whether a timer for initiating failure recovery based on triggering a measurement report is running when the UE enters a configured location; an indication indicating whether a physical layer problem timer is running when the UE leaves a configured location; an indication indicating whether a timer for initiating failure recovery based on triggering a measurement report is running when the UE leaves a configured location; and an indication indicating whether a timer for initiating failure recovery based on triggering a measurement report is running after the at least one SHR condition is met after the HO or CHO is performed. the at least one measurement-based event is satisfied when the UE is in the configured location; an indication indicating whether the at least one measurement-based event is satisfied or not satisfied when the UE is in the configured location; an indication indicating whether the at least one measurement-based event is satisfied or not satisfied before the UE enters the configured location; an indication indicating whether the at least one measurement-based event is satisfied or not satisfied after the UE leaves the configured location; an indication indicating a time difference between two measurement-based events among the at least one measurement-based event that is satisfied when the UE is in the configured location in response to at least two measurement-based events being configured; or a measurement result when the UE performs CHO or HO, where the location-based event is satisfied if the UE is in the configured location.

[0058] According to some embodiments of the present disclosure, an exemplary method performed by a BS is provided, the method including at least transmitting a reconfiguration message including a conditional handover (CHO) configuration and a CHO execution condition for a target cell, the CHO execution condition including a time-based event and at least one measurement-based event, or a location-based event and at least one measurement-based event.

[0059] In some embodiments, each of the at least one measurement-based event is a CondEvent A3, a CondEvent A4, or a CondEvent A5.

[0060] In some embodiments, the CHO execution condition includes a time-based event and at least one measurement-based event, where the time-based event is met if the current time is within a time window, and the time window is configured as a first threshold and a CHO timer having a length, a first threshold and a duration, or a first threshold and a second threshold.

[0061] In some embodiments, the method further includes receiving an indication that the time at which the UE receives the first threshold value is after the first threshold value.

[0062] In some embodiments, the method further includes sending at least one SHR trigger condition for reporting an SHR after the CHO or HO, wherein the at least one SHR trigger condition for reporting an SHR includes at least one of: a physical layer problem timer running at the beginning of a time window; an elapsed time value of the physical layer problem timer being greater than a first configured value of the physical layer problem timer multiplied by a third threshold when the time-based event is satisfied; a timer for initiating fault recovery based on triggering a measurement report running at the beginning of the time window; an elapsed time value of the timer for initiating fault recovery based on triggering a measurement report being greater than a second configured value of the timer for initiating fault recovery based on triggering a measurement report multiplied by a fourth threshold when the time-based event is satisfied; or, in response to the fact that at least two measurement-based events are configured, a time difference between two measurement-based events of the at least one measurement-based event that is satisfied within the time window exceeds a fifth threshold.

[0063] In some embodiments, the method further includes sending at least one trigger condition for reporting an SHR after a CHO or HO, wherein the CHO execution condition includes a location-based event and at least one measurement-based event, and the at least one trigger condition for reporting an SHR includes at least one of: a physical layer problem timer running upon entering the configured location; an elapsed time value of the physical layer problem timer being greater than a first configured value of the physical layer problem timer multiplied by a third threshold when the location-based event is satisfied; a timer for initiating fault recovery based on triggering a measurement report running upon entering the configured location; an elapsed time value of the timer for initiating fault recovery based on triggering a measurement report being greater than a second configured value of the timer for initiating fault recovery based on triggering a measurement report multiplied by a fourth threshold when the location-based event is satisfied; or, in response to the fact that at least two measurement-based events are configured, a time difference between two measurement-based events of the at least one measurement-based event that are satisfied within a time window exceeds a fifth threshold.

[0064] To explain how the advantages and features of the present disclosure may be obtained, the disclosure will be described by reference to specific embodiments thereof that are illustrated in the accompanying drawings. These drawings depict only exemplary embodiments of the disclosure and are therefore not intended to limit the scope of the disclosure. [Brief explanation of the drawings]

[0065] [Figure 1] 1 is an example flow diagram of a method performed by a UE, according to some embodiments of the present disclosure. [Figure 2] 1A-1C are diagrams (including (a), (b), and (c)) illustrating exemplary time window configurations according to some embodiments of the present disclosure. [Figure 3]1A-1C are diagrams (including (a), (b), and (c)) illustrating exemplary time window configurations according to some embodiments of the present disclosure. [Figure 4] 1A-1B are diagrams (including (a) and (b)) illustrating exemplary time window configurations according to some embodiments of the present disclosure. [Figure 5] 1 is an example flow diagram of a method performed by a UE, according to some embodiments of the present disclosure. [Figure 6] FIG. 1 illustrates an exemplary RLF according to some embodiments of the present disclosure. [Figure 7] 1 is an example flow diagram of a method performed by a UE, according to some embodiments of the present disclosure. [Figure 8] FIG. 1 illustrates an exemplary SHR according to some embodiments of the present disclosure. [Figure 9] 1 is an example flow diagram of a method performed by a source BS according to some embodiments of the present disclosure. [Figure 10] FIG. 10 is a simplified block diagram of an example UE or BS in accordance with some other embodiments of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0066] The detailed description of the accompanying drawings is intended as a description of generally preferred embodiments of the invention and is not intended to represent the only form in which the invention may be practiced. It is to be understood that the same or equivalent functions may be accomplished by different embodiments that are intended to be encompassed within the spirit and scope of the invention.

[0067] Although operations are shown in a particular order in the figures, those skilled in the art will readily recognize that such operations need not be performed in the particular order shown or in sequential order, or that among all the shown operations, one or more operations may be skipped to achieve a desired result. Additionally, the figures may generally depict one or more exemplary processes in the form of a flow chart. However, other operations not depicted may be incorporated into the generally depicted exemplary process. For example, one or more additional operations may be performed before, after, simultaneously with, or between any of the depicted operations. In certain situations, multitasking and parallel processing may be advantageous.

[0068] Reference will now be made in detail to some embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. For ease of understanding, the embodiments are provided under specific network architectures and new service scenarios, such as 3GPP 5G NR, 3GPP® Long Term Evolution (LTE), etc. With the development of network architectures and new service scenarios, all embodiments of the present disclosure are still applicable to similar technical problems, and further, the terms described in the present disclosure may change, which will not affect the principles of the present disclosure.

[0069] In some embodiments of the present disclosure, a UE may include a computing device such as a desktop computer, a laptop computer, a personal digital assistant (PDA), a tablet computer, a smart television (e.g., a television connected to the Internet), a set-top box, a game console, a security system (including security cameras), an in-vehicle computer, a network device (e.g., a router, a switch, and a modem), etc. According to embodiments of the present disclosure, a UE may include a portable wireless communication device, a smartphone, a cellular telephone, a flip phone, a device with a subscriber identity module, a personal computer, a selective call receiver, or any other device capable of transmitting and receiving communication signals over a wireless network. In some embodiments, a UE may include a wearable device such as a smart watch, a fitness band, an optical head-mounted display, etc. Furthermore, a UE may be referred to as a subscriber unit, a mobile, a mobile station, a user, a terminal, a mobile terminal, a wireless terminal, a fixed terminal, a subscriber station, a user terminal, or a device, or described using other terms used in the art.

[0070] In some embodiments of the present disclosure, a BS may be referred to as an access point, access terminal, base, base unit, macro cell, wireless node, Node-B, enhanced Node-B, evolved Node-B (eNB), next generation Node-B (gNB), home Node-B, relay node, or device, or may be described using other terms used in the art. A BS is generally part of a radio access network, which may include a controller communicatively coupled to the BS.

[0071] The present disclosure provides various methods and embodiments for CHO in NTN, as well as logging information for MRO.

[0072] 1 shows an example flow diagram of a method 100 performed by a UE according to some embodiments of the present disclosure. It will be understood that in the method 100 or other methods 100 described later, the UE may not be a special UE, but may be a general-purpose device or apparatus or part of a device or apparatus that uses the technical solutions of the present application.

[0073] In operation 110, the UE receives at least a CHO configuration and a CHO execution condition for the target cell. In some embodiments, the CHO execution condition includes a time-based event and at least one measurement-based event. In some embodiments, the CHO execution condition includes a location-based event and at least one measurement-based event.

[0074] In some embodiments, the UE receives the CHO execution condition via a message, for example, a radio resource control (RRC) reconfiguration message (eg, RRCReconfiguration).

[0075] In operation 120, the UE evaluates whether the CHO execution conditions are met.

[0076] In some embodiments, the CHO execution condition includes a time-based event and at least one measurement-based event, and the UE determines that the CHO execution condition is met only when both the time-based event and the at least one measurement-based event are met, and if the at least one measurement-based event includes two or more measurement-based events, the at least one measurement-based event is determined to be met only when all of the two or more measurement-based events are met simultaneously.

[0077] In some embodiments, the CHO execution condition includes a location-based event and at least one measurement-based event, and the UE determines that the CHO execution condition is met only when both the location-based event and the at least one measurement-based event are met, and if the at least one measurement-based event includes two or more measurement-based events, the at least one measurement-based event is determined to be met only when all of the two or more measurement-based events are met simultaneously.

[0078] In one embodiment, each of the at least one measurement-based event is CondEvent A3, CondEvent A4, or CondEvent A5.

[0079] For example, the at least one measurement-based event may include only one measurement-based event, where the measurement-based event is CondEvent A3, CondEvent A4, or CondEvent A5.

[0080] For example, the at least one measurement-based event may include two measurement-based events, and the two measurement-based events may be CondEvent A3 and CondEvent A5.

[0081] For example, the at least one measurement-based event may include two measurement-based events, which may be a CondEvent A3 based on Reference Signal Received Power (RSRP) and a CondEvent A3 based on the ratio between RSRP and a Received Signal Strength Indication (RSSI).

[0082] In one embodiment, the method 100 further includes executing the CHO according to the received CHO configuration if a CHO execution condition is met.

[0083] In some cases, the CHO execution condition includes a time-based event and at least one measurement-based event, the time-based event corresponds to a time window, and the time-based event is satisfied if the current time is within the time window.

[0084] In some embodiments, the time window is in Universal Time (UTC) format.

[0085] In some embodiments, the UE may perform CHO according to the received CHO configuration if at least one measurement-based event is met within the time window.

[0086] In some embodiments, the time window is configured as a first threshold (T1) relative to the start of the time window and a CHO timer, the length of the timer being equal to the length of the time window, as shown in FIG. 2(a), and the CHO timer having the configured length.

[0087] In some embodiments, the UE receives the first threshold (T1) and the configured length via a message, for example, an RRC reconfiguration message.

[0088] As shown in Figure 2(a), the length of the time window is the configured length of the CHO timer. The CHO timer starts running at T1 and expires at T2 (i.e., T1 + the configured length of the CHO timer). The time window is between T1 and T2, and a time-based event is satisfied when the CHO timer runs within the time window.

[0089] However, in some embodiments, there may be a time delay between the transmission of T1 (or a message including T1) from the BS and the reception of T1 (or a message including T1) by the UE; for example, when the UE is within an NTN and there is a long distance between the UE and a satellite of the NTN, when the UE receives T1 at time T3, T3 may already be greater than T1 or even greater than T2.

[0090] If time T3 is greater than T1 (or even greater than T2), in some embodiments, the UE may still start the CHO timer, as shown in FIG. 2(b), and the timer still runs at its configured length. In this example, T2' = (T3 + the configured length of the CHO timer), and the time window is between T3 and T2'. The length of the time window is the configured length of the CHO timer. Although T3 is between T1 and T2 in FIG. 2(b), it will be understood that the solution shown in FIG. 2(b) may also be applied when T3 is greater than T2. ​​The CHO execution condition is determined to be met if at least one measurement-based event is met within the time window.

[0091] In some embodiments, if T3 is greater than T1 and less than T2, the UE may reset the length of the CHO timer as the configured length minus the time difference between T1 and T3 and start the CHO timer at T3, as shown in Figure 2(c). The CHO timer still expires at T2, and the time window is between T3 and T2, and the length of the time window is the reset length of the CHO timer. The CHO execution condition is determined to be met if at least one measurement-based event is met within the time window.

[0092] In some cases where T3 is greater than T2, the UE may not start the CHO timer and the time-based event is determined not to be met.

[0093] In some cases where T3 is greater than T2, the UE may start the CHO timer but immediately stop the CHO timer and the time-based event is determined not to be met.

[0094] In some embodiments, the time window is configured as a first threshold (T1) relative to the start of the time window and a duration of the time window, as shown in FIG. 3(a), and the duration value of the duration is the configured duration value.

[0095] In some embodiments, the UE receives the first threshold (T1) and the configured duration value via a message, for example, an RRC reconfiguration message.

[0096] As shown in Figure 3(a), the duration begins at T1 and ends at T4 (i.e., T1 + the configured duration value). The time window is between T1 and T4, the length of the time window is the configured duration value, and the time-based event is met when the current time is within the time window.

[0097] However, in some embodiments, there may be a time delay between the transmission of T1 (or a message including T1) from the BS and the reception of T1 (or a message including T1) by the UE; for example, when the UE is within an NTN and there is a long distance between the UE and a satellite of the NTN, when the UE receives T1 at time T3, T3 may already be greater than T1 or even greater than T4.

[0098] In some cases where the time point T3 of receiving the time-based event is greater than T1 (or even greater than T4), in some embodiments, the UE may still set the duration value as the configured duration value, as shown in FIG. 3(b), where the duration starts at T3 and ends at T4' (i.e., T1 + the configured duration value). The time window is between T3 and T4', and the length of the time window is still the configured duration value of the CHO timer. In FIG. 3(b), T3 is between T1 and T4, but it is understood that when T3 is greater than T4, the solution shown in FIG. 3(b) may be applied. The CHO execution condition is determined to be met if at least one measurement-based event is met within the time window.

[0099] In some cases where T3 is greater than T1 and less than T4, the UE may reset the duration value of the duration as the configured duration value minus the time difference between T1 and T3, as shown in Figure 3(c). The time window is between T3 and T4, and the length of the time window is the reset duration value. The CHO execution condition is determined to be met if at least one measurement-based event is met within the time window.

[0100] When the time window is configured as a first threshold value for the start of the time window and a duration of the time window, the time-based event may further include a participation condition, which is represented by inequality (1) or inequality (1') that the current time is greater than the first threshold value (i.e., T1) and the current time is less than the first threshold value plus the configured duration value (i.e., T4); in other words, the participation condition is that the current time is within the time window shown in FIG. 3(a). Mt>T1 and Mt <T1+d1 (1) または Mt>T1 and Mt <T4 (1') During the ceremony, Mt: current time or time measured at the UE, and · d1: the configured duration value, T4 = T1 + d1.

[0101] When the time window is configured as a first threshold value for the start of the time window and a duration of the time window, the time-based event may further include an exit condition, where the exit condition is indicated by inequality (2) or inequality (2') that the current time is less than the first threshold value or the current time is greater than the first threshold value plus the configured duration value (i.e., T4). In other words, the exit condition is that the current time is before the time window shown in Figure 3(a) or after the time window shown in Figure 3(a). Mt<T1またはMt> T1+d1 (2) or Mt<T1またはMt> T4 (2') During the ceremony, Mt: current time or time measured at the UE, and · d1: the configured duration value, T4 = T1 + d1.

[0102] If the entry condition is met and / or the exit condition is not met, the time-based event is met. If the entry condition is not met and / or the exit condition is met, the time-based event is not met.

[0103] However, in some embodiments, there may be a time delay between the transmission of T1 (or a message including T1) from the BS and the reception of T1 (or a message including T1) by the UE, e.g., the UE receives T1 at time T3, which may already be greater than T1 or even greater than T4 (e.g., as shown in Figure 3(b) or Figure 3(c)).

[0104] In such cases, the entry and exit conditions for time-based events may be adjusted.

[0105] For example, for the example shown in FIG. 3(a), the joining condition is that the current time is greater than T1 and before T4, and the leaving condition is that the current time is before T1 or greater than T4.

[0106] For example, for the example shown in FIG. 3(b), the joining condition is that the current time is greater than T3 and before T4', and the leaving condition is that the current time is before T3 or greater than T4'.

[0107] For example, for the example shown in FIG. 3(c), the joining condition is that the current time is greater than T3 and before T4, and the leaving condition is that the current time is before T3 or greater than T4.

[0108] In some embodiments, the time window is configured as a first threshold (T1) related to the start of the time window and a second threshold (T5) related to the end of the time window, as shown in Figure 4(a), where the time window is between T1 and T5 and the length of the time window is the time difference between T1 and T5. A time-based event is met when the current time is within the time window.

[0109] In some embodiments, the UE receives the first threshold (T1) and the second threshold (T5) via a message, for example, an RRC reconfiguration message.

[0110] However, in some embodiments, there may be a time delay between the transmission of the two thresholds (or the message containing the two thresholds) from the BS and the reception of the two thresholds (or the message containing the two thresholds) by the UE; for example, when the UE is within an NTN and there is a long distance between the UE and the satellites of the NTN, when the UE receives the two thresholds (or the message containing the two thresholds) at time T3, T3 may already be greater than T1 or even greater than T5.

[0111] In some cases where T3 is greater than T1 and less than T5, in some embodiments, the UE may set a time window to be between T3 and T5, as shown in Figure 4(b). The time window is between T3 and T5, and the length of the time window is the time difference between T3 and T5. The CHO execution condition is determined to be met if at least one measurement-based event is met within the time window.

[0112] In some cases where T3 is greater than T5, the UE may determine that the time-based event is not met, in other words, the CHO execution condition is determined to be not met.

[0113] When the time window is configured as a first threshold related to the start of the time window and a second threshold related to the end of the time window, the time-based event may further include a participation condition, which is shown in inequality (3) that the current time is greater than the first threshold (i.e., T1) and the current time is less than the second threshold (i.e., T5); in other words, the participation condition is that the current time is within the time window shown in FIG. 4(a). Mt>T1 and Mt <T5 (3) where Mt: current time or time measured at the UE.

[0114] When the time window is configured as a first threshold related to the start of the time window and a second threshold related to the end of the time window, the time-based event may include an exit condition, where the exit condition is shown in inequality (4) that the current time is less than the first threshold (i.e., T1) or the current time is greater than the second threshold (i.e., T5). In other words, the exit condition is that the current time is before the time window shown in Figure 4(a) or after the time window shown in Figure 4(a). Mt<T1またはMt> T5 (4) where Mt: current time or time measured at the UE.

[0115] If the entry condition is met and / or the exit condition is not met, the time-based event is met. If the entry condition is not met and / or the exit condition is met, the time-based event is not met.

[0116] However, in some embodiments, there may be a time delay between the transmission of T1 (or a message including T1) from the BS and the reception of T1 (or a message including T1) by the UE; for example, the UE receives T1 at time T3, which may already be greater than T1 or even greater than T5 (e.g., as shown in FIG. 4(b)).

[0117] In such cases, the entry and exit conditions for time-based events may be adjusted.

[0118] For example, for the example shown in FIG. 4(a), the joining condition is that the current time is greater than T1 and before T5, and the leaving condition is that the current time is before T1 or greater than T5.

[0119] For example, for the example shown in FIG. 4(b), the joining condition is that the current time is greater than T3 and before T5, and the leaving condition is that the current time is before T3 or greater than T5.

[0120] In some embodiments, no matter what kind of configuration of the time window is used, if the time point at which the time-based event is received is greater than a first threshold (i.e., T1), the UE may ignore or even discard the at least one received CHO execution condition. In an embodiment, the UE may retain the received CHO configuration for possible further use.

[0121] In some embodiments, if the time point at which the time-based event is received is greater than a first threshold, the UE may send an indication to the BS indicating that the time point at which the time-based event is received is greater than the first threshold. In some embodiments, the UE receives the time-based event via an RRC reconfiguration message, and when the indication indicates that the time point at which the RRC reconfiguration message is received (e.g., T3) is greater than the first threshold, the network may make some corresponding adjustments to avoid such cases.

[0122] In some embodiments, the indication that the time-based event is received at a point in time greater than the first threshold is transmitted via an RRC reconfiguration complete message.

[0123] In some embodiments, the CHO execution condition includes a location-based event and at least one measurement-based event. The location-based event is met if the UE remains within a configured location. The CHO execution condition is met if at least one measurement-based event is met while the UE is within a configured location.

[0124] In some embodiments, the UE may perform CHO according to the received CHO configuration if at least one measurement-based event is met when the UE is within the configured location.

[0125] According to the present disclosure, if the UE evaluates that the CHO execution condition is met, the UE may perform CHO according to the received CHO configuration for the target cell.

[0126] However, if RLF occurs, the UE does not perform CHO, and the UE may access a new cell by re-establishment or connection setup. The UE may store the most recent RLF report until it is fetched by the network, or the UE may retain the most recent RLF report for 48 hours. When the UE enters a connected state, the re-established cell may send a UE Information Request to the UE, and the UE may send a UE Information Response including the RLF report to the re-established cell. The re-established cell may forward the RLF report to the last serving cell (or source cell) for the UE. Finally, the RLF report may be under analysis, and the network may thereby optimize mobility; in other words, the RLF report may be used for MRO.

[0127] 5 illustrates a method 500 performed by a UE based on the method 100 according to some embodiments of the present disclosure. It will be understood that in the method 500, the UE may not be a special UE, but may be a general-purpose device or apparatus or part of a device or apparatus that uses the technical solutions of the present application.

[0128] At operation 510, the UE receives at least a CHO configuration and a CHO execution condition for the target cell. In some embodiments, the CHO execution condition includes a time-based event and at least one measurement-based event. In some embodiments, the CHO execution condition includes a location-based event and at least one measurement-based event.

[0129] In some embodiments, the UE receives the CHO execution condition via a message, for example, a radio resource control (RRC) reconfiguration message (eg, RRCReconfiguration).

[0130] In operation 520, the UE evaluates whether the CHO execution condition is met.

[0131] In some embodiments, the CHO execution condition includes a time-based event and at least one measurement-based event, and the UE determines that the CHO execution condition is met only when both the time-based event and the at least one measurement-based event are met, and if the at least one measurement-based event includes two or more measurement-based events, the at least one measurement-based event is determined to be met only when all of the two or more measurement-based events are met simultaneously.

[0132] In some embodiments, the CHO execution condition includes a location-based event and at least one measurement-based event, and the UE determines that the CHO execution condition is met only when both the location-based event and the at least one measurement-based event are met, and if the at least one measurement-based event includes two or more measurement-based events, the at least one measurement-based event is determined to be met only when all of the two or more measurement-based events are met simultaneously.

[0133] In operation 530, the UE declares an RLF, for example, if an RLF occurs before the CHO execution condition is met.

[0134] In operation 540, the UE performs a re-establishment procedure due to the RLF.

[0135] In operation 550, the UE transmits RLF information to the re-established cell.

[0136] Optionally, in operation 510, the CHO execution condition includes a time-based event and at least one measurement-based event, and the time-based event is met if the current time is within a configured time window.

[0137] In some embodiments, the RLF information includes at least an indication of whether at least one measurement-based event is met or not met within the time window.

[0138] In some embodiments, the RLF information includes at least one satisfied measurement-based event within a time window.

[0139] In some embodiments, the RLF information includes at least an indication of whether at least one measurement-based event is met or not met before the time window.

[0140] In some embodiments, the RLF information includes at least an indication of whether at least one measurement-based event is met or not met after the time window.

[0141] In some embodiments, the RLF information includes, in response to the fact that at least two measurement-based events are configured, an indication of a time difference between two measurement-based events of at least one measurement-based event that is satisfied within a time window.

[0142] It is understood that the RLF information may include other information and / or indications not mentioned above without departing from the spirit of this disclosure.

[0143] According to the present disclosure, the time difference may be used by the network to analyze why CHO cannot be performed even when two measurement-based events are satisfied one after the other when a time-based event is satisfied, and the network may perform MRO to increase the success rate of CHO.

[0144] For example, as shown in FIG. 6, the CHO execution condition for the target cell includes two measurement-based events (event#1 and event#2). Within the time window, event#1 is met in period 1 starting from time T6, and event#2 is met in period 2 starting from time T7. There is no overlap between period 1 and period 2, i.e., event#1 and event#2 are not met simultaneously within the time window, and therefore, the UE does not perform CHO. At time T8, an RLF occurs. Although T8 is after the time window in FIG. 6, it will be understood that T8 may be within the time window according to the present disclosure. In this example, the time difference is (T7-T6).

[0145] In some embodiments, the RLF information includes at least the measurement results at the end of the time window.

[0146] Optionally, in operation 510, the CHO execution condition includes a location-based event and at least one measurement-based event, and the location-based event is met if the UE is within a configured location.

[0147] In some embodiments, the RLF information includes at least an indication of whether at least one measurement-based event is met or not met when the UE is within a configured location.

[0148] In some embodiments, the RLF information includes at least one satisfied measurement-based event when the UE is within a configured location.

[0149] In some embodiments, the RLF information includes at least an indication of whether at least one measurement-based event is met or not met before the UE enters the configured location.

[0150] In some embodiments, the RLF information includes at least an indication of whether at least one measurement-based event is met or not met after the UE leaves its configured location.

[0151] In some embodiments, the RLF information includes, in response to the fact that at least two measurement-based events are configured, an indication indicating at least a time difference between two measurement-based events of the at least one measurement-based event that are satisfied when the UE is within a configured location. According to the present disclosure, the time difference may be used by the network to analyze why CHO cannot be performed even when the two measurement-based events are satisfied one after the other when the location-based event is satisfied, and the network may perform MRO to increase the success rate of CHO.

[0152] In some embodiments, the RLF information includes at least measurements when the UE leaves its configured location.

[0153] It is understood that the RLF information may include other information and / or indications not mentioned above without departing from the spirit of this disclosure.

[0154] According to the present disclosure, to further enhance the MRO capability of the network, the UE is further configured to report SHR information after CHO or HO.

[0155] 7 illustrates a method 700 performed by a UE based on the method 100 according to some embodiments of the present disclosure. It will be understood that in the method 700, the UE may not be a special UE, but may be a general-purpose device or apparatus or part of a device or apparatus that uses the technical solutions of the present application.

[0156] At operation 710, the UE receives at least a CHO configuration and a CHO execution condition for a first target cell. In some embodiments, the CHO execution condition includes a time-based event and at least one measurement-based event. In some embodiments, the CHO execution condition includes a location-based event and at least one measurement-based event.

[0157] At operation 720, the UE further receives at least one SHR trigger condition for reporting an SHR after a CHO or HO.

[0158] According to the present disclosure, when the at least one SHR trigger condition for reporting an SHR includes at least two trigger conditions, if one or more of the at least one SHR trigger condition is satisfied during a CHO or HO, the UE may transmit an SHR after the CHO or HO.

[0159] In operation 730, the UE evaluates whether the CHO execution condition is met.

[0160] In some embodiments, the CHO execution condition includes a time-based event and at least one measurement-based event, and the UE determines that the CHO execution condition is met only when both the time-based event and the at least one measurement-based event are met, and if the at least one measurement-based event includes two or more measurement-based events, the at least one measurement-based event is determined to be met only when all of the two or more measurement-based events are met simultaneously.

[0161] In some embodiments, the CHO execution condition includes a location-based event and at least one measurement-based event, and the UE determines that the CHO execution condition is met only when both the location-based event and the at least one measurement-based event are met, and if the at least one measurement-based event includes two or more measurement-based events, the at least one measurement-based event is determined to be met only when all of the two or more measurement-based events are met simultaneously.

[0162] In operation 740, the UE performs CHO if the CHO execution conditions are met, or the UE receives an HO command and performs HO if certain requirements are met.

[0163] In operation 750, if one or more of the at least one SHR trigger conditions for reporting an SHR are met during CHO or HO, the UE transmits an SHR to the second target cell after accessing the second target cell. If the UE performs CHO in response to the fact that the CHO execution condition is met, the second target cell is the first target cell. If the UE performs HO in response to receiving an HO command, the second target cell may be the same first target cell or may be a different target cell.

[0164] According to the present disclosure, after receiving the SHR, the second target cell may forward the SHR or a portion of the SHR to the source cell over the Xn interface via an access and mobility indication. The access and mobility indication is used to transfer information related to access and mobility between two BSs. The network (including the source cell and the second target BS) may analyze the SHR for MRO.

[0165] In some cases, in operation 710, the CHO execution conditions include a time-based event and at least one measurement-based event, and the at least one SHR trigger condition for reporting SHR after CHO or HO may include at least one of the following: A physical layer problem timer is running at the beginning of a time window corresponding to a time-based event; the elapsed time value of the physical layer problem timer is greater than the first configured value of the physical layer problem timer multiplied by the third threshold when the time-based event is satisfied; a timer for initiating fault recovery based on triggering a measurement report is running at the beginning of a time window; an elapsed time value of the timer for initiating fault recovery based on triggering a measurement report is greater than a second configured value of the timer for initiating fault recovery based on triggering a measurement report multiplied by a fourth threshold when the timer-based event is satisfied; or In response to the fact that at least two measurement-based events are constituted, the time difference between two measurement-based events of the at least one measurement-based event that is satisfied within the time window exceeds a fifth threshold value.

[0166] It is understood that the at least one SHR triggering condition may include other SHR triggering conditions not mentioned above as long as it is not contrary to the spirit of the present disclosure.

[0167] In some embodiments, the UE may transmit an SHR after a HO or CHO if any one or more of at least one SHR triggering condition is met.

[0168] In some embodiments, the SHR may include at least an indication of whether the physical layer problem timer is running at the beginning of a time window.

[0169] In some embodiments, the SHR may include at least an indication of whether a timer for initiating failure recovery based on triggering a measurement report is running at the beginning of a time window.

[0170] In some embodiments, the SHR may include at least an indication of whether the physical layer problem timer is running at the end of a time window.

[0171] In some embodiments, the SHR may include at least an indication of whether a timer for initiating failure recovery based on triggering a measurement report is running at the end of a time window.

[0172] In some embodiments, the SHR may include at least one SHR condition that is met after HO or CHO is performed.

[0173] In some embodiments, the SHR may include at least an indication of whether at least one measurement-based event is met or not met within a time window.

[0174] In some embodiments, the SHR may include at least an indication of whether at least one measurement-based event is met or not met before a time window.

[0175] In some embodiments, the SHR may include at least an indication of whether at least one measurement-based event is met or not met after a time window.

[0176] In some embodiments, the SHR information includes an indication of a time difference between at least two measurement-based events among the at least one measurement-based event that is satisfied within a time window, in response to the fact that at least two measurement-based events are configured. According to the present disclosure, the time difference may be used by the network to improve MRO functionality, for example, to further increase the success rate of CHO.

[0177] For example, as shown in Figure 8, the CHO execution condition for the target cell includes two measurement-based events (event #1 and event #2). Within the time window, event #1 is satisfied during at least period 3, which begins at time T9 and includes time T10, and event #2 begins to be satisfied at time T10. In other words, event #1 and event #2 are satisfied simultaneously at time T10 within the time window, and therefore the UE performs CHO. In this example, the time difference is (T10 - T9).

[0178] In some embodiments, the SHR may include measurements when performing at least CHO or HO.

[0179] It is understood that the SHR may include other information and / or indications not set forth above without departing from the spirit of the present disclosure.

[0180] In some cases, in operation 710, the CHO execution condition includes a location-based event and at least one measurement-based event, and the location-based event is met if the UE is within a configured location. The at least one SHR trigger condition for reporting SHR after CHO or HO may include at least one of the following: A physical layer problem timer runs when entering a configured location; the elapsed time value of the physical layer problem timer is greater than the first configured value of the physical layer problem timer multiplied by the third threshold when the location-based event is satisfied; - upon entering a configured location, a timer runs to initiate fault recovery based on triggering a measurement report; an elapsed time value of the timer for initiating fault recovery based on triggering a measurement report is greater than a second configured value of the timer for initiating fault recovery based on triggering a measurement report multiplied by a fourth threshold when the location-based event is satisfied; or In response to the fact that at least two measurement-based events are constituted, the time difference between two measurement-based events of the at least one measurement-based event that is satisfied within the time window exceeds a fifth threshold value.

[0181] It is understood that the at least one SHR triggering condition may include other SHR triggering conditions not mentioned above as long as it is not contrary to the spirit of the present disclosure.

[0182] In some embodiments, the UE may transmit an SHR after a HO or CHO if any one or more of at least one SHR triggering condition is met.

[0183] In some embodiments, the SHR may include at least an indication of whether a physical layer problem timer is running when the UE enters a configured location.

[0184] In some embodiments, the SHR may include at least an indication of whether a timer is running to initiate failure recovery based on triggering a measurement report when the UE enters a configured location.

[0185] In some embodiments, the SHR may include at least an indication of whether a physical layer problem timer is running when the UE leaves its configured location.

[0186] In some embodiments, the SHR may include at least an indication of whether a timer is running to initiate failure recovery based on triggering a measurement report when the UE leaves its configured location.

[0187] In some embodiments, the SHR may include at least one SHR condition that is met after HO or CHO is performed.

[0188] In some embodiments, the SHR may include at least an indication of whether at least one measurement-based event is met or not met when the UE is within a configured location.

[0189] In some embodiments, the SHR may include at least an indication that at least one measurement-based event is or is not met before the UE enters the configured location.

[0190] In some embodiments, the SHR may include at least an indication that at least one measurement-based event is met or not met after the UE leaves its configured location.

[0191] In some embodiments, the SHR information includes, in response to the fact that at least two measurement-based events are configured, an indication of a time difference between two of the at least one measurement-based event that are satisfied when the UE is within a configured location. According to the present disclosure, the time difference may be used by the network to improve MRO functionality, e.g., to further increase the success rate of CHO.

[0192] In some embodiments, the SHR may include measurements when performing at least CHO or HO.

[0193] It is understood that the SHR may include other information and / or indications not set forth above without departing from the spirit of the present disclosure.

[0194] Various methods and embodiments for a UE to perform according to the present disclosure are described above. It will be understood that the source BS and / or the target BS may perform the corresponding methods according to the present disclosure.

[0195] 9 shows an example flow chart of a method 900 performed by a source BS or a serving BS according to some embodiments of the present disclosure. It will be understood that in the method 900, the BS may not be a special BS, but may be a general-purpose device or apparatus or node or part of a device or apparatus or node that uses the technical solutions of the present application.

[0196] At operation 910, the BS transmits at least a CHO configuration and a CHO execution condition for the target cell. In some embodiments, the CHO execution condition includes a time-based event and at least one measurement-based event. In some embodiments, the CHO execution condition includes a location-based event and at least one measurement-based event. In some embodiments, the CHO execution condition and the CHO configuration are included in a reconfiguration message, for example, an RRC reconfiguration message.

[0197] In some embodiments, the BS sends the CHO execution condition via a radio resource control (RRC) reconfiguration message, eg, RRCReconfiguration.

[0198] In one embodiment, each of the at least one measurement-based event is CondEvent A3, CondEvent A4, or CondEvent A5.

[0199] For example, the at least one measurement-based event may include only one measurement-based event, where the measurement-based event is CondEvent A3, CondEvent A4, or CondEvent A5.

[0200] For example, the at least one measurement-based event may include two measurement-based events, and the two measurement-based events may be CondEvent A3 and CondEvent A5.

[0201] For example, the at least one measurement-based event may include two measurement-based events, and the two measurement-based events may be CondEvent A3 based on RSRP and CondEvent A3 based on the ratio between RSRP and RSSI.

[0202] In one embodiment, the method 100 further includes sending an HO command to the UE.

[0203] In some embodiments, when a CHO execution condition includes a time-based event and at least one measurement-based event, the time-based event is satisfied if the current time is within a time window. If at least one measurement-based event is satisfied within the time window, it means that the CHO execution condition is satisfied.

[0204] In some embodiments, the UE may perform CHO according to the received CHO configuration if at least one measurement-based event is met within the time window.

[0205] In some embodiments, the time window is configured as a first threshold (T1) relative to the start of the time window and a CHO timer, as shown in Figure 2(a), where the CHO timer has a configured length. In some embodiments, the configured length is set via an RRC reconfiguration message.

[0206] In some embodiments, the time window is configured as a first threshold (T1) relative to the start of the time window and a duration of the time window, the duration having a configured duration value, as shown in Figure 3(a). In some embodiments, the configured duration value is set via an RRC reconfiguration message.

[0207] In some embodiments, the time window is configured as a first threshold (T1) related to the start of the time window and a second threshold (T5) related to the end of the time window, as shown in Figure 4(a), where the time window is between T1 and T5 and the length of the time window is the time difference between T1 and T5. A time-based event is met when the current time is within the time window.

[0208] In some embodiments, the method 900 may further include, if the CHO execution condition includes a time-based event and at least one measurement-based event, receiving an indication that the UE will receive the time-based event after the first threshold. In some embodiments, the indication is received via an RRC reconfiguration complete message.

[0209] In some embodiments, the method 900 may further include transmitting at least one SHR trigger condition to the UE for reporting the SHR.

[0210] When the CHO execution conditions include a time-based event and at least one measurement-based event, the at least one SHR trigger condition for reporting an SHR includes at least one of the following: The physical layer problem timer is running at the beginning of the time window, the elapsed time value of the physical layer problem timer is greater than the first configured value of the physical layer problem timer multiplied by the third threshold when the time-based event is satisfied; a timer for initiating fault recovery based on triggering a measurement report is running at the beginning of a time window; the elapsed time value of the timer for initiating fault recovery based on triggering a measurement report is greater than a second configured value of the timer for initiating fault recovery based on triggering a measurement report multiplied by a fourth threshold when a time-based event is satisfied; or In response to the fact that at least two measurement-based events are constituted, the time difference between two measurement-based events of the at least one measurement-based event that is satisfied within the time window exceeds a fifth threshold value.

[0211] When the CHO execution condition includes a location-based event and at least one measurement-based event, the at least one SHR trigger condition for reporting an SHR includes at least one of the following: A physical layer problem timer is running when entering a configured location, the elapsed time value of the physical layer problem timer is greater than the first configured value of the physical layer problem timer multiplied by the third threshold when the location-based event is satisfied; A timer is running to initiate fault recovery based on triggering a measurement report when entering a configured location; an elapsed time value of the timer for initiating fault recovery based on triggering a measurement report is greater than a second configured value of the timer for initiating fault recovery based on triggering a measurement report multiplied by a fourth threshold when the location-based event is satisfied; or In response to the fact that at least two measurement-based events are constituted, the time difference between two measurement-based events of the at least one measurement-based event that is satisfied within the time window exceeds a fifth threshold value.

[0212] It will be understood that in the methods and embodiments provided by the present disclosure, the numbers of each operation do not represent the order of execution. For example, in diagram 700, operation 720 may be performed before operation 710, or operation 720 and operation 710 may be performed simultaneously.

[0213] The present disclosure provides various methods and embodiments for CHO in an NTN when the time at which a UE receives a time window configuration corresponding to a time-based event is after the start time of the time window.

[0214] The present disclosure designs time-based event entry and exit conditions for CHOs in NTNs.

[0215] The present disclosure provides more information within the RLF report or SHR regarding CHO performance conditions that combines measurements with time or location to enhance NTN MRO.

[0216] FIG. 10 illustrates a simplified block diagram of an exemplary apparatus 1000 according to various embodiments of the present disclosure.

[0217] In some embodiments, the apparatus 1000 may be or include at least part of a UE or similar device having similar functionality.

[0218] In some embodiments, the apparatus 1000 may be at least part of or include a BS or similar device having similar functionality.

[0219] 10, the apparatus 1000 may include at least a wireless transceiver 1010 and a processor 1020, where the wireless transceiver 1010 may be coupled to the processor 1020. Additionally, the apparatus 1000 may include a non-transitory computer-readable medium 1030 having computer-executable instructions 1040 stored thereon, where the non-transitory computer-readable medium 1030 may be coupled to the processor 1020, where the computer-executable instructions 1040 may be configured to be executable by the processor 1020. In some embodiments, the wireless transceiver 1010, the non-transitory computer-readable medium 1030, and the processor 1020 may be coupled to each other via one or more local buses.

[0220] 10, elements such as the wireless transceiver 1010, the non-transitory computer-readable medium 1030, and the processor 1020 are described in the singular, but the plural is contemplated unless limitation to the singular is explicitly stated. In some embodiments of the present disclosure, the wireless transceiver 1010 may be configured for wireless communication. In some embodiments of the present disclosure, the wireless transceiver 1010 may be integrated into a transceiver. In certain embodiments of the present disclosure, the device 1000 may further include other components for actual use.

[0221] In some embodiments where the apparatus 1000 is a UE or at least part of a UE, the processor 1020 is configured to cause the apparatus 1000 to perform, at least using the wireless transceiver 1010, any of the above-described methods performed by a UE according to the present disclosure.

[0222] The processor 1020 is configured to, using the wireless transceiver 1010, at least receive a CHO configuration and a CHO execution condition for the target cell, where the CHO execution condition includes a time-based event and at least one measurement-based event, or a location-based event and at least one measurement-based event, and evaluate whether the CHO execution condition is satisfied.

[0223] In some embodiments, each of the at least one measurement-based event is a CondEvent A3, a CondEvent A4, or a CondEvent A5.

[0224] In some embodiments, the CHO execution condition includes a time-based event and at least one measurement-based event, the time-based event corresponds to a time window, the time-based event is met if the current time is within the time window, and the time window is configured as: a first threshold and a CHO timer for the start of a time window, the length of the CHO timer being equal to the length of the time window; a first threshold for the start of a time window and the duration of the time window; or A first threshold value relating to the start of the time window and a second threshold value relating to the end of the time window.

[0225] In some embodiments, in response to the fact that the time window is configured as a first threshold and a duration, the time-based event further includes a participation condition, and the participation condition of the time-based event is the inequality that the current time is greater than the first threshold and the current time is less than the first threshold plus the configured duration value.

[0226] In some embodiments, in response to the fact that the time window is configured as a first threshold and a duration, the time-based event further includes an exit condition, and the exit condition of the time-based event is an inequality that the current time is less than the first threshold or the current time is greater than the first threshold plus the configured duration value.

[0227] In some embodiments, in response to the fact that the time window is configured as a first threshold and a second threshold, the time-based event further includes a participation condition, and the participation condition of the time-based event is an inequality that the current time is greater than the first threshold and the current time is less than the second threshold.

[0228] In some embodiments, in response to the fact that the time window is configured as a first threshold and a second threshold, the time-based event further includes an exit condition, and the exit condition of the time-based event is an inequality that the current time is less than the first threshold or the current time is greater than the second threshold.

[0229] In one embodiment, in response to the fact that the time window is configured as a first threshold value for the start of the time window and a CHO timer, the processor 1020 is further configured to start the CHO timer in response to the fact that the time point at which the first threshold value is received is greater than the first threshold value for the start of the time window.

[0230] In some embodiments, in response to the fact that the time point at which the first threshold is received is greater than the first threshold value of the start of the time window, the processor 1020 is further configured to set the length of the CHO timer as one of the configured length of the CHO timer minus the time difference between the first threshold and the time point and the configured length of the CHO timer.

[0231] In some embodiments, the time window is configured as a first threshold value relative to the start of the time window and a CHO timer, and in response to the fact that the time point at which the first threshold value is received is greater than the first threshold value of the time window, the processor 1020 is further configured to not start the CHO timer, or to start the CHO timer and immediately stop the CHO timer.

[0232] In some embodiments, depending on the fact that the time window is configured as a first threshold value related to the start of the time window and a duration of the time window, or the time window is configured as a first threshold value related to the start of the time window and a second threshold value related to the end of the time window, the time-based event further comprises an entry condition and / or an exit condition.

[0233] In some embodiments, to evaluate whether the time-based event is met, the processor 1020 is further configured to determine that the time-based event is met depending on the fact that the joining condition is met and / or the leaving condition is not met.

[0234] In some embodiments, the processor 1020 is further configured to, in response to the fact that the time point at which the first threshold value is received is greater than the first threshold value, set the duration as one of the configured duration value minus the time difference between the first threshold value and the time point and the configured duration value.

[0235] In some embodiments, in response to the fact that the time point at which the first threshold is received is greater than the first threshold, the processor 1020 is further configured to ignore the CHO execution condition, discard the CHO execution condition, and retain the CHO configuration.

[0236] In some embodiments, in response to the fact that the time point at which the first threshold value is received is greater than the first threshold value, the processor 1020 is further configured to transmit, using the wireless transceiver 1010, an indication to indicate that the time point is greater than the first threshold value.

[0237] In some embodiments, the indication is sent via a reconfiguration complete message.

[0238] In some embodiments, the processor 1020 is further configured to declare an RLF if an RLF occurs, perform a re-establishment procedure due to the RLF, and send RLF information to the re-established cell.

[0239] If the CHO execution conditions include a time-based event and at least one measurement-based event, the RLF information includes at least one of the following: an indication of whether at least one measurement-based event is met or not met within a time window; an event based on at least one met measurement within a time window, an indication of whether at least one measurement-based event is met or not met before the time window; an indication of whether at least one measurement-based event is met or not met after the time window; Depending on the fact that at least two measurement-based events are constituted, an indication of the time difference between two measurement-based events of the at least one measurement-based event being fulfilled within a time window, or Measurement results at the end of the time window.

[0240] If the CHO execution condition includes a location-based event and at least one measurement-based event, the RLF information includes at least one of the following: an indication of whether at least one measurement-based event is met or not met when the UE is within a configured location; An event based on at least one fulfilled measurement when the UE is within a configured location; an indication of whether at least one measurement-based event is met or not met before the UE enters its configured location; an indication of whether at least one measurement-based event is met after the UE leaves its configured location; In response to the fact that at least two measurement-based events are configured, an indication indicating a time difference between two measurement-based events of the at least one measurement-based event that are satisfied when the UE is within the configured location; or Measurement results when the UE leaves its configured location, and the location-based event is met if the UE is within its configured location.

[0241] In some embodiments, the processor 1020 is further configured to receive, using the wireless transceiver 1010, at least one SHR trigger condition for reporting an SHR after a CHO or HO.

[0242] If the CHO running conditions include a time-based event and at least one measurement-based event, then at least one SHR condition includes at least one of the following: The physical layer problem timer is running at the beginning of the time window, the elapsed time value of the physical layer problem timer is greater than the first configured value of the physical layer problem timer multiplied by the third threshold when the time-based event is satisfied; a timer for initiating fault recovery based on triggering a measurement report is running at the beginning of a time window; an elapsed time value of the timer for initiating fault recovery based on triggering a measurement report is greater than a second configured value of the timer for initiating fault recovery based on triggering a measurement report multiplied by a fourth threshold when the timer-based event is satisfied; or In response to the fact that at least two measurement-based events are constituted, the time difference between two measurement-based events of the at least one measurement-based event that is satisfied within the time window exceeds a fifth threshold value.

[0243] In some embodiments, the processor 1020 is further configured to perform HO or CHO and report the SHR to the target cell in response to at least one SHR trigger condition for reporting the SHR being met.

[0244] If the CHO execution conditions include a time-based event and at least one measurement-based event, the SHR includes at least one of the following: An indication of whether the physical layer problem timer is running at the beginning of a time window; an indication of whether a timer for initiating fault recovery based on triggering a measurement report is running at the beginning of a time window; An indication of whether the physical layer problem timer is running at the end of a time window; an indication of whether a timer for initiating fault recovery based on triggering a measurement report is running at the end of a time window; At least one SHR condition was met after HO or CHO was performed; an indication of whether at least one measurement-based condition is met or not met within a time window; an indication of whether at least one measurement-based event is met or not met before the time window; an indication of whether at least one measurement-based event is met or not met after a time window; Depending on the fact that at least two measurement-based events are constituted, an indication of the time difference between two measurement-based events of the at least one measurement-based event being fulfilled within a time window, or Measurement results when performing CHO or HO.

[0245] If the CHO execution condition includes a location-based event and at least one measurement-based event, the at least one SHR trigger condition includes at least one of the following: A physical layer problem timer is running when entering a configured location, the elapsed time value of the physical layer problem timer is greater than the first configured value of the physical layer problem timer multiplied by the third threshold when the location-based event is satisfied; A timer is running to initiate fault recovery based on triggering a measurement report when entering a configured location; an elapsed time value of the timer for initiating fault recovery based on triggering a measurement report is greater than a second configured value of the timer for initiating fault recovery based on triggering a measurement report multiplied by a fourth threshold when the location-based event is satisfied; or In response to the fact that at least two measurement-based events are constituted, the time difference between two measurement-based events of the at least one measurement-based event that is satisfied within the time window exceeds a fifth threshold value.

[0246] If the CHO execution conditions include a location-based event and at least one measurement-based event, the SHR includes at least one of the following: An indication of whether a physical layer problem timer is running when the UE enters a configured location; an indication of whether a timer is running for initiating failure recovery based on triggering a measurement report when the UE enters a configured location; An indication of whether a physical layer problem timer is running when the UE leaves its configured location; an indication of whether a timer is running for initiating failure recovery based on triggering a measurement report when the UE leaves its configured location; At least one SHR condition was met after HO or CHO was performed; an indication of whether at least one measurement-based event is met or not met when the UE is within a configured location; an indication that at least one measurement-based event is met or not met before the UE enters a configured location; an indication that at least one measurement-based event is met or not met after the UE leaves its configured location; In response to at least two measurement-based events being configured, an indication indicating a time difference between two measurement-based events of the at least one measurement-based event that are satisfied when the UE is within the configured location; or Measurement results when the UE performs CHO or HO, where a location-based event is met if the UE is within a configured location.

[0247] In some embodiments where the apparatus 1000 is a BS or at least part of a BS, the processor 1020 is configured to cause the apparatus 1000 to perform, at least using the wireless transceiver 1010, any of the above-described methods performed by a BS according to the present disclosure.

[0248] The processor 1020 is configured to use the wireless transceiver 1010 to at least transmit a CHO configuration and a CHO execution condition for the target cell, wherein the CHO execution condition includes a time-based event and at least one measurement-based event, or a location-based event and at least one measurement-based event.

[0249] In some embodiments, each of the at least one measurement-based event is a CondEvent A3, a CondEvent A4, or a CondEvent A5.

[0250] In some embodiments, the CHO execution condition includes a time-based event and at least one measurement-based event, where the time-based event is met if the current time is within a time window, where the time window is configured as: a CHO timer having a first threshold and a length; a first threshold and duration, or · First and second thresholds.

[0251] In some embodiments, the processor 1020 is further configured to receive, using the wireless transceiver 1010, an indication that the UE receives the first threshold value after the first threshold value.

[0252] In some embodiments, the indication is received via a reconfiguration complete message.

[0253] In some embodiments, the processor 1020 is further configured to transmit, using the wireless transceiver 1010, at least one SHR trigger condition for reporting an SHR after a CHO or HO.

[0254] When the CHO execution conditions include a time-based event and at least one measurement-based event, the at least one SHR trigger condition for reporting an SHR includes at least one of the following: The physical layer problem timer is running at the beginning of the time window, the elapsed time value of the physical layer problem timer is greater than the first configured value of the physical layer problem timer multiplied by the third threshold when the time-based event is satisfied; a timer for initiating fault recovery based on triggering a measurement report is running at the beginning of a time window; the elapsed time value of the timer for initiating fault recovery based on triggering a measurement report is greater than a second configured value of the timer for initiating fault recovery based on triggering a measurement report multiplied by a fourth threshold when a time-based event is satisfied; or In response to the fact that at least two measurement-based events are constituted, the time difference between two measurement-based events of the at least one measurement-based event that is satisfied within the time window exceeds a fifth threshold value.

[0255] When the CHO execution condition includes a location-based event and at least one measurement-based event, the at least one SHR trigger condition for reporting an SHR includes at least one of the following: A physical layer problem timer is running when entering a configured location, the elapsed time value of the physical layer problem timer is greater than the first configured value of the physical layer problem timer multiplied by the third threshold when the location-based event is satisfied; A timer is running to initiate fault recovery based on triggering a measurement report when entering a configured location; an elapsed time value of the timer for initiating fault recovery based on triggering a measurement report is greater than a second configured value of the timer for initiating fault recovery based on triggering a measurement report multiplied by a fourth threshold when the location-based event is satisfied; or In response to the fact that at least two measurement-based events are constituted, the time difference between two measurement-based events of the at least one measurement-based event that is satisfied within the time window exceeds a fifth threshold value.

[0256] In various exemplary embodiments, processor 1020 may include at least one hardware processor, including at least one microprocessor, such as a CPU, a portion of at least one hardware processor, or any other suitable special-purpose processor, such as, for example, a special-purpose processor developed based on a field programmable gate array (FPGA) and an application-specific integrated circuit (ASIC). Additionally, processor 1020 may also include at least one other circuit or element not shown in FIG. 10.

[0257] In various exemplary embodiments, the non-transitory computer-readable medium 1030 may include at least one storage medium of various forms, such as volatile memory and / or non-volatile memory. Volatile memory may include, for example, but is not limited to, RAM, cache, etc. Non-volatile memory may include, for example, but is not limited to, ROM, hard disk, flash memory, etc. Furthermore, the non-transitory computer-readable medium 1030 may include, but is not limited to, an electric, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above.

[0258] Additionally, in various exemplary embodiments, the exemplary device 1000 may also include at least one other circuit, element, and interface, such as an antenna element.

[0259] In various exemplary embodiments, the circuits, components, elements, and interfaces in exemplary device 1000, including processor 1020 and non-transitory computer-readable medium 1030, may be coupled together in any suitable manner, such as electrically, magnetically, optically, electromagnetically, etc., via any suitable connection, including, but not limited to, a bus, a crossbar, wires, and / or wireless lines.

[0260] The methods of the present disclosure can be implemented on a programmed processor. However, the controllers, flow charts, and modules may also be implemented in hardware electronic or logic circuitry such as a general-purpose or special-purpose computer, a programmed microprocessor or microcontroller and peripheral integrated circuit elements, integrated circuits, discrete element circuits, programmable logic devices, etc. In general, any device having a finite state machine capable of implementing the flow charts shown in the figures may be used to perform the processing functions of the present disclosure.

[0261] While the present disclosure has been described using specific embodiments thereof, it is apparent that many alternatives, modifications, and variations will be apparent to those skilled in the art. For example, various components of the embodiments may be interchanged, added, or substituted in other embodiments. Also, not all elements shown in the figures are necessary for the operation of the disclosed embodiments. For example, one skilled in the art of the disclosed embodiments can make and use the teachings of the present disclosure by simply employing the elements of the independent claims. Accordingly, the embodiments of the present disclosure described herein are intended to be illustrative and not limiting. Various changes may be made without departing from the spirit and scope of the present disclosure.

[0262] The terms "includes," "comprising," "includes," "including," or any other variation thereof, are intended to encompass a non-exclusive inclusion, such that a process, method, product, or apparatus that comprises a list of elements does not include only those elements, but may include other elements not expressly listed or inherent in such process, method, product, or apparatus. An element preceded by "a," "an," etc., does not, absent further constraints, exclude the presence of additional identical elements in the process, method, product, or apparatus that comprises the element. Also, the term "another" is defined as at least a second or more. As used herein, the terms "including," "having," etc. are defined as "comprising." [Explanation of symbols]

[0263] 100 ways 500 ways 700 methods 900 ways 1000 devices 1010 Wireless Transceiver 1020 processor 1030 Non-transitory computer-readable medium 1040 Computer Executable Instructions

Claims

1. at least one memory; at least one processor coupled to the at least one memory; A user equipment (UE) including: the processor receiving at least a conditional handover (CHO) configuration and a CHO execution condition for a target cell, the CHO execution condition comprising: a time-based event and at least one measurement-based event, or receiving, including location-based events and at least one measurement-based event; and configured to execute a CHO if a condition is met, and to evaluate whether the CHO execution condition is met; The CHO execution condition includes the time-based event and the at least one measurement-based event, the time-based event corresponds to a time window, and the time window comprises: a first threshold and a CHO timer for the start of the time window, the length of the CHO timer being equal to the length of the time window; a first threshold for the start of the time window and the duration of the time window; or configured as a first threshold value related to the start of the time window and a second threshold value related to the end of the time window; The processor is further configured to modify a length of the time window when the time point at which the first threshold value is received is greater than the first threshold value relative to a start of the time window. User Equipment (UE).

2. 2. The UE of claim 1, wherein the at least one measurement-based event is CondEvent A3, CondEvent A4, or CondEvent A5.

3. When the time window is configured as the first threshold and the duration, the time-based event further includes a participation condition; 2. The UE of claim 1, wherein the participation condition for the time-based event is an inequality that the current time is greater than the first threshold and the current time is less than the first threshold plus a configured duration value.

4. When the time window is configured as the first threshold and the duration, the time-based event further includes an exit condition; 2. The UE of claim 1, wherein the condition for leaving the time-based event is an inequality that the current time is less than the first threshold or the current time is greater than the first threshold plus the configured duration value.

5. When the time window is configured as the first threshold and the second threshold, the time-based event further includes a participation condition; 2. The UE of claim 1, wherein the participation condition for the time-based event is an inequality that a current time is greater than the first threshold and the current time is less than the second threshold.

6. When the time window is configured as the first threshold and the second threshold, the time-based event further includes an exit condition; 2. The UE of claim 1, wherein the departure condition for the time-based event is an inequality that a current time is less than the first threshold or the current time is greater than the second threshold.

7. When the time window is configured as the first threshold value relative to the start of a time window and the CHO timer, the at least one processor 10. The UE of claim 1, further configured to start the CHO timer when a time point at which the first threshold value is received is greater than the first threshold value at the start of the time window and less than the end of the time window.

8. When the time point at which the first threshold value is received is greater than the first threshold value at the start of the time window and less than the end of the time window, the at least one processor adjusts the length of the CHO timer to: the configured length of the CHO timer minus the time difference between the first threshold and the point in time; or the configured length of the CHO timer The UE of claim 7, further configured to set as

9. the time window is configured as the first threshold value relative to the start of the time window and the CHO timer, and when the time at which the first threshold value is received is greater than the second threshold value of the time window, the at least one processor The UE of claim 1 , further configured to: not start the CHO timer, or start the CHO timer and immediately stop the CHO timer.

10. 10. The UE of claim 1, wherein the time-based event further includes a join condition or a leave condition when the time window is configured as the first threshold value related to the start of the time window and the duration of the time window, or when the time window is configured as the first threshold value related to the start of the time window and the second threshold value related to the end of the time window.

11. the at least one processor for evaluating whether the time-based event is met when the time window is configured as the first threshold value relative to the start of a time window and the duration of the time window. The UE of claim 10, further configured to determine that the time-based event is satisfied when the join condition is satisfied or the leave condition is not satisfied.

12. the at least one processor When the time point at which the first threshold value is received is greater than the first threshold value, the duration is a configured duration value minus the time difference between the first threshold and the point in time; or The configured duration value The UE of claim 1 , further configured to set:

13. When the time when the first threshold value is received is greater than the first threshold value, the at least one processor Ignore the CHO execution condition, The UE of claim 1 , further configured to discard the CHO execution condition and retain the CHO configuration.

14. When the time when the first threshold value is received is greater than the first threshold value, the at least one processor The UE of claim 1 , further configured to transmit an indication that the time point is greater than the first threshold.

15. 1. A processor for wireless communications, comprising: at least one controller coupled to at least one memory, receiving at least a conditional handover (CHO) configuration and a CHO execution condition for a target cell, the CHO execution condition comprising: a time-based event and at least one measurement-based event, or receiving, including location-based events and at least one measurement-based event; and configured to evaluate whether a CHO execution condition is satisfied, and if satisfied, execute a CHO; The CHO execution condition includes the time-based event and the at least one measurement-based event, the time-based event corresponds to a time window, and the time window comprises: a first threshold and a CHO timer for the start of the time window, the length of the CHO timer being equal to the length of the time window; a first threshold for the start of the time window and the duration of the time window; or configured as a first threshold value related to the start of the time window and a second threshold value related to the end of the time window; and further configured to modify a length of the time window when the time point at which the first threshold value is received is greater than the first threshold value relative to a start of the time window. Processor.

16. A method performed by a user equipment (UE), the method comprising: receiving at least a conditional handover (CHO) configuration and a CHO execution condition for a target cell, the CHO execution condition comprising: a time-based event and at least one measurement-based event, or receiving, including location-based events and at least one measurement-based event; evaluating whether the CHO execution condition is satisfied, executing the CHO if satisfied; The CHO execution condition includes the time-based event and the at least one measurement-based event, the time-based event corresponds to a time window, and the time window comprises: a first threshold and a CHO timer for the start of the time window, the length of the CHO timer being equal to the length of the time window; a first threshold for the start of the time window and the duration of the time window; or configured as a first threshold value related to the start of the time window and a second threshold value related to the end of the time window; and modifying the length of the time window when the time point at which the first threshold value is received is greater than the first threshold value relative to the start of the time window. method.

17. A base station (BS), at least one memory; at least one processor coupled to the at least one memory, wherein the processor sending a reconfiguration message to a user equipment (UE) including at least a conditional handover (CHO) configuration and a CHO execution condition for the target cell, wherein the CHO execution condition comprises: a time-based event and at least one measurement-based event, or configured to transmit, including location-based events and at least one measurement-based event; The CHO execution condition used by the UE includes the time-based event and the at least one measurement-based event, the time-based event corresponds to a time window, and the time window comprises: a first threshold and a CHO timer for the start of the time window, the length of the CHO timer being equal to the length of the time window; a first threshold for the start of the time window and the duration of the time window; or configured as a first threshold value related to the start of the time window and a second threshold value related to the end of the time window; When the time when the reconfiguration message is received is greater than the first threshold value relative to the start of the time window, the length of the time window is changed. Base station (BS).

18. 18. The BS of claim 17, wherein the at least one measurement-based event includes CondEvent A3, CondEvent A4, or CondEvent A5.

Images