Method and apparatus for measurement configuration and failure recovery for UAV UE

Abstract

The application relates to a method and apparatus for measurement configuration and failure recovery for unmanned aerial vehicle (UAV) user equipment (UE). One embodiment of the present disclosure provides a user equipment (UE) comprising: a transceiver; and a processor coupled with the transceiver and configured to: determine whether one or more conditions associated with movement of the UE are satisfied; and performing at least one of the following if at least one of the one or more conditions is satisfied: transmitting a first indication indicating that at least one of the one or more conditions is satisfied; adjusting measurement configuration; applying a fast beam fault detection (BFD) configuration; skipping a beam failure recovery (BFR) program; or enabling a fast radio link failure (RLF) procedure.

Description

Technical Field

[0001] The present disclosure relates to wireless communications, and in particular, to methods and apparatus for measurement configuration and fault recovery of unmanned aerial vehicle (UAV) user equipment (UE). Background Art

[0002] When an aerial UE (e.g., a UAV UE, hereinafter in this disclosure, the term "UAV UE" is used) flies in the sky, the path loss or line-of-sight (LOS) path loss between the UAV UE and the neighboring cells may be very small. The UAV UE may not only receive strong signals from many neighboring cells, but also act as a strong interference to the neighboring cells (because the transmission from the UAV UE is also strong). In order to detect this situation, the BS may configure measurements for the UAV UE and determine the situation according to the reported measurement results from the UAV UE.

[0003] However, the UAV UE may fly in an ascending direction or a descending direction, that is, the UAV UE may move in a vertical direction at a relatively high speed.

[0004] In this scenario, the current measurement configuration may not be adaptable, and it is desired to provide a measurement configuration and fault recovery solution for the UAV UE. Summary of the invention

[0005] One embodiment of the present disclosure provides a user equipment (UE), comprising: a transceiver; and a processor, which is coupled to the transceiver and configured to: determine whether one or more conditions associated with the movement of the UE are met; and perform at least one of the following when at least one of the one or more conditions is met: transmit a first indication indicating that at least one of the one or more conditions is met; adjust a measurement configuration; apply a fast beam failure detection (BFD) configuration; skip a beam failure recovery (BFR) procedure; or enable a fast radio link failure (RLF) procedure.

[0006] In some embodiments, the processor is further configured to: receive a second indication instructing the UE to perform at least one of: adjust the measurement configuration; apply the fast BFD configuration; skip the BFR procedure; or enable the fast RLF procedure.

[0007] In some embodiments, the one or more conditions associated with the movement of the UE include at least one of the following: a measurement event associated with the height of the UE is triggered; the height of the UE is higher than a first configured height threshold; the height of the UE is lower than a second configured height threshold; wherein the duration for which the event associated with the height of the UE is triggered is longer than a first time threshold; wherein the duration for which the height of the UE is higher than the first configured height threshold is longer than a second time threshold; wherein the duration for which the height of the UE is lower than the second configured height threshold is longer than a third time threshold; the vertical speed of the UE is higher than a vertical speed threshold; the vertical acceleration of the UE is higher than a vertical acceleration threshold; the average vertical speed of the UE during the duration is higher than an average vertical speed threshold during the duration; the average acceleration speed of the UE during the duration is higher than an average vertical acceleration threshold during the duration; the total number of changed beams or changed cells during the duration is higher than a threshold associated with the total number of changed beams or changed cells during the duration; or the height change of the UE during the duration is higher than a height change threshold.

[0008] In some embodiments, the measurement configuration is associated with at least one of: a merging threshold; a maximum number of merged beams; a beam associated with the highest cell measurement result; a trigger event threshold; a reporting amount; a trigger time (TTT) configuration; or a measurement object and reporting configuration.

[0009] In some embodiments, the fast BFD configuration includes a timer for beam failure detection and a maximum number of beam failure instances.

[0010] In some embodiments, if the total number of beam failure indications exceeds a maximum threshold of beam failure indications and BFR skipping is enabled, the processor is further configured to: skip the BFR procedure and declare RLF.

[0011] In some embodiments, the processor is further configured to: initiate a timer for the fast RLF procedure if timer T310 is running or an N310 out-of-sync indication is received.

[0012] In some embodiments, the processor is further configured to: declare RLF when the timer for the fast RLF procedure expires.

[0013] Another embodiment of the present disclosure provides a base station (BS), comprising: a transceiver; and a processor, which is coupled to the transceiver and configured to: receive a first indication from a UE indicating that at least one of one or more conditions is met; and transmit a second indication to the UE indicating that the UE performs at least one of the following: adjust measurement configuration; apply fast BFD configuration; skip BFR procedure; or enable fast RLF procedure.

[0014] Another embodiment of the present disclosure provides a method performed by a UE, comprising: determining whether one or more conditions associated with the movement of the UE are met; and performing at least one of the following when at least one of the one or more conditions is met: transmitting a first indication indicating that at least one of the one or more conditions is met; adjusting the measurement configuration; applying a fast BFD configuration; skipping the BFR procedure; or enabling a fast RLF procedure.

[0015] In some embodiments, the method further comprises: receiving a second indication instructing the UE to perform at least one of: adjusting the measurement configuration; applying the fast BFD configuration; skipping the BFR procedure; or enabling the fast RLF procedure.

[0016] In some embodiments, the one or more conditions associated with the movement of the UE include at least one of the following: a measurement event associated with the height of the UE is triggered; the height of the UE is higher than a first configured height threshold; the height of the UE is lower than a second configured height threshold; wherein the duration for which the event associated with the height of the UE is triggered is longer than a first time threshold; wherein the duration for which the height of the UE is higher than the first configured height threshold is longer than a second time threshold; wherein the duration for which the height of the UE is lower than the second configured height threshold is longer than a third time threshold; the vertical speed of the UE is higher than a vertical speed threshold; the vertical acceleration of the UE is higher than a vertical acceleration threshold; the average vertical speed of the UE during the duration is higher than an average vertical speed threshold during the duration; the average acceleration speed of the UE during the duration is higher than an average vertical acceleration threshold during the duration; the total number of changed beams or changed cells during the duration is higher than a threshold associated with the total number of changed beams or changed cells during the duration; or the height change of the UE during the duration is higher than a height change threshold.

[0017] In some embodiments, the measurement configuration is associated with at least one of: a merging threshold; a maximum number of merged beams; a beam associated with a highest cell measurement result; a triggering event threshold; a reporting amount; a TTT configuration; or a measurement object and reporting configuration.

[0018] In some embodiments, the fast BFD configuration includes a timer for beam failure detection and a maximum number of beam failure instances.

[0019] In some embodiments, if the total number of beam failure indications exceeds a maximum threshold of beam failure indications and BFR skipping is enabled, the processor is further configured to: skip the BFR procedure and declare RLF.

[0020] In some embodiments, the method further comprises: starting a timer for the fast RLF procedure if the timer T310 is running or the N310 out-of-sync indication is received.

[0021] In some embodiments, the method further comprises: declaring RLF when the timer for the fast RLF procedure expires.

[0022] Another embodiment of the present disclosure provides a method performed by a base station (BS), comprising: receiving a first indication from a UE indicating that at least one of one or more conditions is satisfied; and transmitting a second indication to the UE indicating that the UE performs at least one of the following: adjusting a cell measurement configuration; applying a fast BFD configuration; skipping a BFR procedure; or enabling a fast RLF procedure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to describe the manner in which the advantages and features of the present application can be obtained, the description of the present application is presented with reference to specific embodiments of the present application, which are illustrated in the accompanying drawings. These drawings depict only example embodiments of the present application and therefore should not be considered as limiting the scope thereof.

[0024] Figure 1 is a schematic diagram illustrating a wireless communication system according to some embodiments of the present disclosure.

[0025] Figure 2 A measurement model according to some embodiments of the present disclosure is described.

[0026] Figure 3 Methods for fast BFD and BFR skipping according to some embodiments of the present disclosure are described.

[0027] Figure 4 A method for a fast RLF procedure according to some embodiments of the present disclosure is described.

[0028] Figure 5 A wireless communication method performed by a UE according to some embodiments of the present disclosure is described.

[0029] Figure 6 A wireless communication method performed by a BS according to some embodiments of the present disclosure is described.

[0030] Figure 7 A simplified block diagram illustrating an apparatus according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0031] The detailed description of the accompanying drawings is intended as a description of the currently preferred embodiments of the present invention and is not intended to represent the only form in which the present invention can be practiced. It should be understood that the same or equivalent functions can be implemented by different embodiments intended to be included in the spirit and scope of the present invention.

[0032] Although the operations are depicted in a particular order in the drawings, those skilled in the art will readily recognize that such operations need not be performed in the particular order as shown or in a sequential order, or that all of the illustrated operations need to be performed to achieve the desired result; one or more operations may sometimes be skipped. In addition, the drawings may schematically depict one or more example processes in the form of a flow chart. However, other operations not depicted may be incorporated into the schematically illustrated example processes. For example, one or more additional operations may be performed before, after, simultaneously with, or between any of the illustrated operations. In some cases, multitasking and parallel processing may be advantageous.

[0033] Reference will now be made in detail to some embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. To facilitate understanding, embodiments are provided under specific network architectures and new service scenarios, such as cellular telephone networks, networks based on time division multiple access (TDMA), networks based on code division multiple access (CDMA), networks based on orthogonal frequency division multiple access (OFDMA), LTE networks, networks based on the third generation partnership project (3GPP), LTE, advanced LTE (LTE-A), 3GPP 4G, 3GPP 5G NR, 3GPP Release 16 and higher, satellite communication networks, high altitude platform networks, and the like. It is considered that with the development of network architectures and new business scenarios, all embodiments in the present disclosure are also applicable to similar technical problems; and in addition, the terms cited in the present disclosure may be changed, which should not affect the principles of the present disclosure.

[0034] Figure 1 A schematic diagram illustrating a wireless communication system, i.e., an unmanned aerial system (UAS). Figure 1In the figure, the wireless communication system includes a UAV UE 101 and three BSs 102 (including BS 102-A, BS 102-B and BS 102-C and may be referred to as BS 102 hereinafter). BS 102-A manages a cell 111, BS 102-B manages a cell 112, and BS 102-C manages a cell 113. The UAV UE is moving. At time T1, the UAV UE is at a location marked by 101-T1 and accesses a cell 112 having a physical cell ID (PCI) PCI#0; at time T2, the UAV UE is at a location marked by 101-T2 and accesses a cell 111 having a physical cell ID PCI#1; and at time T3, the UAV UE is at a location marked by 101-T3 and accesses a cell 113 having a physical cell ID PCI#2.

[0035] UE 101 may include UAV UE, unmanned vehicle or other user equipment, and is simply referred to as UE in this disclosure. UE may communicate directly with BS 102 via uplink (UL) communication signals.

[0036] BSs 102 may be distributed throughout a geographic area. In some embodiments, each of BSs 102 may also be referred to as an access point, access terminal, base station, macro cell, Node-B, enhanced Node-B (eNB), gNB, home Node-B, relay node, or any device described using other terms used in the art. BSs 102 are typically part of a radio access network that may include one or more controllers communicatively coupled to one or more corresponding BSs 102.

[0037] The wireless communication system is compatible with any type of network capable of sending and receiving wireless communication signals. For example, the wireless communication system is compatible with wireless communication networks, cellular telephone networks, networks based on time division multiple access (TDMA), networks based on code division multiple access (CDMA), networks based on orthogonal frequency division multiple access (OFDMA), LTE networks, networks based on the third generation partnership project (3GPP), 3GPP 5G networks, satellite communication networks, high altitude platform networks, and / or other communication networks.

[0038] In some embodiments, the wireless communication system is compatible with the 5G New Radio (NR) of the 3GPP protocol, wherein the BS 102 transmits data using an Orthogonal Frequency Division Multiplexing (OFDM) modulation scheme on the downlink, and the UE transmits data using a Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) or Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) scheme on the uplink. More generally, the wireless communication system may implement some other open or proprietary communication protocols, such as WiMAX and other protocols.

[0039] In some other embodiments, BS102 may communicate using other communication protocols, such as the IEEE 802.11 series of wireless communication protocols. In addition, in some embodiments, BS102 may communicate via licensed spectrum, while in other embodiments, BS102 may communicate via unlicensed spectrum. The present disclosure is not intended to be limited to any particular wireless communication system architecture or protocol implementation. In another embodiment, BS102 may communicate with UE using 3GPP 5G protocols.

[0040] although Figure 1 Although a specific number of UEs and BSs are depicted in FIG. 1 , a person skilled in the art will recognize that any number of UEs and BSs may be included in a wireless communication system.

[0041] exist Figure 1 In the present invention, the UAV UE may be ascending (when T1 is earlier than T3) or descending (when T1 is later than T3), and the UAV UE may move in the vertical direction at a relatively high speed. However, the cellular network may be optimized for terrestrial UEs, and the main beam of a cell is usually tilted downward and may not have continuous coverage in the vertical direction. On the other hand, as the altitude of the UAV UE increases, the UAV UE may detect more and more cells and may quickly switch among beams from multiple neighboring cells. Specifically, the following problems may exist:

[0042] 1. Because beams or cells frequently change in a short period, there may be large RRC signaling overhead for measurement and switching during the rising period or the falling period, which may also cause larger UL interference.

[0043] 2. The vertical coverage of the side lobes of a cell may be discontinuous, which may frequently cause RLF or HOF during the rising period or the falling period.

[0044] 3. Beams / cells change rapidly in a short period of time; therefore, measurements and switching procedures are performed in a short period of time, which requires high UE capabilities.

[0045] Figure 2 A measurement model according to some embodiments of the present disclosure is described.

[0046] In the RRC_CONNECTED state, the UE may measure multiple beams (at least one) of a cell and average the measurements (power values) to derive the cell quality. To do so, the UE is configured to consider a subset of the detected beams. Filtering occurs at two different levels: at the physical layer to derive the beam quality, and then at the RRC layer to derive the cell quality from multiple beams. The cell quality from beam measurements is derived in the same way for serving cells and non-serving cells. If the UE is configured by the BS to do this, the measurement report may contain the measurement results of the X best beams.

[0047] At the box marked by "Beam combining / selection", beam specific measurements can be combined to derive cell quality. At the box marked by "Beam selection for beam reporting", several measurements can be selected from the measurements used for beam reporting.

[0048] This disclosure proposes some solutions for beam combining / selection and beam selection. Figure 2 For other parts of TS 38.300, please refer to the 3GPP file, such as Section 9.2.4 of TS 38.300, and thus, such details are omitted here.

[0049] In the present disclosure, the BS may configure one or more conditions associated with the movement of the UAV UE. If at least one condition is met, the UE may be considered to be moving vertically. The one or more conditions may include at least one of the following:

[0050] 1.H1 event is triggered;

[0051] The H1 event implies that the height of the UE becomes higher than a threshold. In the case where the H1 event is triggered, the UE may be determined to be moving vertically. In the case where the H1 event is not triggered, the UE may be determined to be not moving vertically.

[0052] 2.H2 event is triggered;

[0053] The H2 event implies that the height of the UE becomes below a threshold. In the case where the H2 event is triggered, the UE may be determined to be not moving vertically. In the case where the H2 event is not triggered, the UE may be determined to be moving vertically.

[0054] 3. The height of the UE is higher than the first threshold configured by the BS;

[0055] The BS may configure a first height threshold, for example, the first threshold may be 10 m (or other values). When the height of the UE becomes higher than the first height threshold, that is, the height of the UE is higher than 10 m, the UE may be determined to be moving vertically.

[0056] 4. The height of the UE is lower than a second threshold configured by the BS;

[0057] The BS may configure a second height threshold, for example, the second height threshold may be 2 m (or other values). When the height of the UE becomes lower than the second height threshold, ie, the height of the UE is lower than 2 m, the UE may be determined to be not moving vertically.

[0058] In some embodiments, the first height threshold and the second height threshold may have the same value.

[0059] 5. The duration of the H1 event being triggered is longer than the first time threshold;

[0060] The BS may configure the first time threshold, for example, the configured first time threshold may be 5s (or other values). If the duration of the H1 event being triggered is longer than the first time threshold, that is, the duration of the H1 event being triggered is longer than 5s, the UE may be determined to be moving vertically.

[0061] 6. The duration of the H2 event being triggered is longer than the first time threshold;

[0062] The BS may configure the first time threshold, for example, the configured first time threshold may be 5s (or other values). If the duration of the H2 event being triggered is longer than the first time threshold, that is, the duration of the H2 event being triggered is longer than 5s, the UE may be determined to be not moving vertically.

[0063] In some embodiments, the time threshold associated with the H1 event may be different from the time threshold associated with the H2 event, for example, the time threshold associated with the H1 event is 5 seconds, and the time threshold associated with the H2 event is 2 seconds.

[0064] 7. wherein the duration for which the UE's altitude is above the first configured altitude threshold is longer than a second time threshold;

[0065] The BS may configure a first height threshold and a second time threshold. For example, the configured first height threshold may be 10 m.

[0066] (or other values), and the configured second time threshold may be 5s (or other values).

[0067] In case the duration of 10 m is longer than 5 s, the UE may be determined to be moving vertically.

[0068] 8. wherein the duration for which the UE's altitude is below the second configured altitude threshold is longer than a third time threshold;

[0069] The BS may configure the second height threshold and the third time threshold. For example, the configured second height threshold may be 2 m.

[0070] (or other values), and the configured third time threshold may be 4s (or other values). In the case where the duration in which the height of the UE is lower than 2m is longer than 4s, the UE may be determined to be not moving vertically.

[0071] 9. The vertical speed of the UE is higher than the vertical speed threshold;

[0072] The BS may configure a vertical speed threshold, for example, the vertical speed threshold may be 1 m / s (or other values). If the vertical speed of the UE is higher than the vertical speed threshold, that is, the vertical speed of the UE is higher than 1 m / s, the UE may be determined to be moving vertically. Otherwise, the UE may be determined to be not moving vertically.

[0073] 10. The vertical acceleration of the UE is higher than the vertical acceleration threshold;

[0074] BS can configure the vertical acceleration threshold, for example, the vertical acceleration threshold can be 1m / s 2 (or other values). When the vertical acceleration of the UE is higher than the vertical acceleration threshold, that is, the vertical acceleration of the UE is higher than 1m / s 2 In the case where the UE is moving vertically, the UE may be determined to be moving vertically. Otherwise, the UE may be determined to be not moving vertically.

[0075] 11. The average vertical speed of the UE during the duration is higher than the average vertical speed threshold during the duration;

[0076] The BS may configure an average vertical velocity threshold, for example, the average vertical velocity threshold may be 1 m / s (or other values). If the average vertical velocity of the UE is higher than the average vertical velocity threshold, that is, the average vertical velocity of the UE is higher than 1 m / s, the UE may be determined to be moving vertically. Otherwise, the UE may be determined to be not moving vertically.

[0077] 12. The average acceleration speed of the UE during the duration is higher than the average vertical acceleration threshold during the duration;

[0078] The BS can configure the average vertical acceleration threshold. For example, the average vertical acceleration threshold can be 1m / s 2 (or other values). When the average vertical acceleration of the UE is higher than the average vertical acceleration threshold, that is, the average vertical acceleration of the UE is higher than 1 m / s 2 In the case where the UE is moving vertically, the UE may be determined to be moving vertically. Otherwise, the UE may be determined to be not moving vertically.

[0079] 13. The total number of changed beams or changed cells during the duration is above a threshold associated with the total number of changed beams or changed cells during the duration;

[0080] The BS may configure the maximum total number of changed beams or changed cells and the duration. For example, the maximum total number of changed beams or changed cells may be 5, and the duration may be 10s. In the case where the total number of changed beams or changed cells during the duration is greater than the maximum total number of changed beams or changed cells, for example, the total number of changed beams or changed cells during 10s is greater than 5, the UE may be determined to be moving vertically. Otherwise, the UE may be determined to be not moving vertically.

[0081] 14. The UE's altitude change during the duration is higher than the altitude change threshold.

[0082] The BS may configure a height change threshold and duration. For example, the height change threshold may be 5m, and the duration may be 10s. If the height change during the duration is greater than the height change threshold, i.e., the height change during 10s is greater than 5m, the UE may be determined to be moving vertically. Otherwise, the UE may be determined not to be moving vertically.

[0083] The present disclosure introduces a dedicated measurement configuration for a UAV UE moving vertically. Hereinafter, this dedicated measurement configuration for a UAV UE moving vertically is referred to as a "dedicated measurement configuration". For a UAV UE, when it is not moving vertically, it can apply the measurement configuration. When the UAV UE is moving vertically, it can apply the dedicated measurement configuration.

[0084] In some embodiments, when the UAV UE determines that it is moving vertically, it may transmit an indication to the BS indicating that at least one of the above conditions (for determining whether the UAV UE is moving vertically) is met.

[0085] On the BS side, after receiving the indication, the BS knows that the UAV UE is moving vertically and may transmit an indication to the UAV UE to instruct the UAV UE to apply a dedicated measurement configuration.

[0086] In some other embodiments, when the UAV UE determines that it is moving vertically based on at least one condition for determining whether the UAV UE is moving vertically being met, it may autonomously apply a dedicated measurement configuration.

[0087] The dedicated measurement configuration may include at least one of the following:

[0088] 1. Merge threshold;

[0089] A new combining threshold may be configured for UEs that are moving vertically compared to UEs that are not moving vertically.

[0090] Specifically, a higher merging threshold may be configured for rising UEs. During beam merging / selection, a higher merging threshold may be applied, and beams with not-so-good measurements may not be merged into the cell result. As a result, the cell result may be higher, and the event condition may be met sooner.

[0091] 2. Maximum number of combined beams;

[0092] A new maximum number of merged beams may be configured. For example, the maximum number may be configured to be 2, and in this case, the beam associated with the highest cell measurement result and the beam associated with the second highest cell measurement result are merged.

[0093] 3. The beam associated with the highest cell measurement result;

[0094] The beam with the highest measurement result can be used as the cell result. Therefore, the cell result can be the highest and the event condition can be satisfied faster.

[0095] 4. Trigger event threshold;

[0096] Specific trigger event thresholds can be configured. For example, a lower threshold or a smaller hysteresis value can be configured so that the event can be triggered faster. For example, a lower hysteresis value can be configured.

[0097] 5. Report volume;

[0098] A specific reporting amount may be configured for ascending UAV UEs. In this way, the measurement reporting amount is controlled.

[0099] 6. TTT configuration; or

[0100] A specific TTT configuration may be configured that may trigger a report more quickly. For example, a smaller value may be configured for TTT so that a report is triggered more quickly.

[0101] 7. Measurement object (MO) and report configuration.

[0102] Specific measurement objects and reporting configurations may be configured for ascending UAV UEs.

[0103] In some embodiments, new values ​​may be configured for the above parameters in the dedicated measurement configuration. In some other embodiments, a scaling factor is introduced, and the parameters in the dedicated measurement configuration may be obtained by multiplying the existing configured parameters with the scaling factor. In some other embodiments, an offset is introduced, and the parameters in the dedicated measurement configuration may be obtained by applying the offset to the existing configured parameters. It should be noted that the applied scaling factor or offset may be the same or may be different for different parameters.

[0104] Figure 3 Methods for fast BFD and BFR skipping according to some embodiments of the present disclosure are described.

[0105] like Figure 3 As shown in FIG, when a beam failure is detected by the UE, it may trigger a BFR. In case of a successful RACH procedure, the BFR is considered successful; in case of a failed RACH procedure, the UAV UE may declare an RLF and perform a reestablishment procedure.

[0106] For UAV UEs in vertical motion (e.g., ascending or descending), events such as BFD and RLF may need to be triggered faster. Therefore, the present disclosure proposes a method for fast BFD and BFR skipping.

[0107] Specifically, a timer for fast BFD (e.g., beam failure detection timer) or a counter threshold for fast BFD (e.g., beam failure instance maximum count) or both may be configured. Values ​​may be configured for both the timer for fast BFD and the counter threshold for fast BFD so that fast BFD may be triggered more quickly.

[0108] When the UAV UE is moving vertically, the BS may instruct the UAV UE to apply the fast BFD configuration, or the UAV UE may apply the fast BFD configuration autonomously. The UAV UE may evaluate the beam failure based on the timer for fast BFD and the counter threshold for fast BFD. For example, if a beam failure instance indication has been received from the lower layer, the UAV UE may start or restart the timer for fast BFD and increment the counter of BFI (e.g., BFI_COUNTER) by 1. When the value of the BFI counter is greater than or equal to the counter threshold for fast BFD, BFD is triggered for the cell, or the lower layer may indicate the beam failure to the upper layer.

[0109] In some other embodiments, BFR may be skipped, ie, the RACH procedure is skipped, and RLF is directly declared. Specifically, when the UAV UE is moving vertically, the BS may instruct the UAV UE to enable BFR skipping, or the UAV UE may autonomously enable BFR skipping.

[0110] For example, in the MAC layer, if the value of the BFI counter is greater than or equal to a threshold (e.g., a counter threshold for fast BFD), the serving cell is a SpCell, and BFR skipping is enabled, the MAC layer may indicate a beam failure of the SpCell to the upper layer. In some other embodiments, whether BFR skipping is enabled is determined by an upper layer.

[0111] In the RRC layer, after receiving an indication of a beam failure of a SpCell with BFR skipping from the MAC layer, it may be considered that a radio link failure is detected and an RLF may be declared. In the case where the MAC layer does not indicate that BFR skipping is enabled, the RRC may determine that the UAV UE is moving vertically and may further determine that BFR skipping is enabled autonomously or based on an indication from the BS.

[0112] In some embodiments, the UAV UE may be moving and may be configured with a fast BFR procedure that may include beam failure detection and fast beam failure recovery. The UAV UE may continuously evaluate whether the conditions for determining whether the UAV UE is moving vertically are met. In the case of vertical movement of the UAV UE, it may be configured by the BS or autonomously apply a fast BFD or BFR configuration.

[0113] It should be noted that new values ​​may be configured for parameters such as a timer for fast BFD or a counter threshold for fast BFD. In some other embodiments, a scaling factor is introduced, and the timer for fast BFD or the counter threshold for fast BFD may be obtained by multiplying an existing timer or counter threshold with the scaling factor. In some other embodiments, an offset is introduced, and the timer for fast BFD or the counter threshold for fast BFD may be obtained by applying the offset to an existing timer or an existing counter. It should be noted that the scaling factor or offset applied may be the same or may be different for different parameters.

[0114] Figure 4 A method for a fast RLF procedure according to some embodiments of the present disclosure is described.

[0115] like Figure 4 As shown in FIG. 3 , when the N310 out-of-sync indication is received, the timer T310 is triggered, and when the timer T310 is running, the N311 in-sync indication is received and the radio link is restored. When the timer T310 expires, RLF is declared.

[0116] Timer T312 may be configured and enabled per MO, and when timer T310 is running, timer T312 is started. When timer T312 expires, RLF is declared.

[0117] The present disclosure introduces a time for fast RLF, which can be configured for the UAV UE when the UAV UE is in vertical movement. The fast RLF can be configured by the BS by transmitting an indication to the UAV UE or by the UAV UE autonomously when the UAV UE is in vertical movement.

[0118] The timer for fast RLF may be started when the N310 out-of-sync indication is received or when the timer T310 is running. In the event that the timer for fast RLF expires, RLF may be declared. The timer for fast RLF may be configured with a value shorter than the value of the timer T310.

[0119] When the timer for fast RLF is running, the timer for fast RLF may be stopped when the N311 synchronization indication is received and the physical layer problem is recovered.

[0120] It should be noted that a new value may be configured for the value of the timer for fast RLF. In some other embodiments, a scaling factor is introduced, and the timer for fast RLF may be obtained by multiplying an existing timer by the scaling factor. In some other embodiments, an offset is introduced, and the timer for fast RLF may be obtained by applying the offset to an existing timer.

[0121] Figure 5A method for wireless communication performed by a UE according to some embodiments of the present disclosure is described.

[0122] In operation 501, the UE may determine whether one or more conditions associated with the movement of the UE are satisfied. In operation 502, the UE may perform at least one of the following if at least one of the one or more conditions is satisfied: transmitting a first indication indicating that at least one of the one or more conditions is satisfied; adjusting a measurement configuration; applying a fast BFD configuration; skipping a BFR procedure; or enabling an RLF procedure. For example, the UE may adjust the measurement configuration to a dedicated measurement configuration.

[0123] In operation 502, the UE may autonomously perform at least one of: adjusting measurement configuration; applying fast BFD configuration; skipping the BFR procedure; or enabling a fast RLF procedure.

[0124] Figure 6 A method for wireless communication performed by a BS according to some embodiments of the present disclosure is described.

[0125] In operation 601, the BS may receive a first indication from the UE indicating that at least one of one or more conditions is satisfied; and in operation 602, the BS may transmit a second indication to the UE indicating that the UE performs at least one of the following: adjust measurement configuration; apply fast BFD configuration; skip the BFR procedure; or enable a fast RLF procedure.

[0126] Correspondingly, on the UE side, the UE may be further configured to: receive a second indication instructing the UE to perform at least one of the following: adjust measurement configuration; apply fast BFD configuration; skip BFR procedure; or enable fast RLF procedure. That is, the UE may perform these operations based on the indication from the BS.

[0127] In some embodiments, one or more conditions associated with the movement of the UE include at least one of the following: a measurement event associated with the UE's altitude is triggered; the UE's altitude is higher than a first configured altitude threshold; the UE's altitude is lower than a second configured altitude threshold; wherein the duration for which the event associated with the UE's altitude is triggered is longer than a first time threshold; wherein the duration for which the UE's altitude is higher than the first configured altitude threshold is longer than a second time threshold; wherein the duration for which the UE's altitude is lower than the second configured altitude threshold is longer than a third time threshold; the UE's vertical speed is higher than a vertical speed threshold; the UE's vertical acceleration is higher than a vertical acceleration threshold; the UE's average vertical speed during the duration is higher than an average vertical speed threshold during the duration; the UE's average acceleration speed during the duration is higher than an average vertical acceleration threshold during the duration; the total number of changed beams or changed cells during the duration is higher than a threshold associated with the total number of changed beams or changed cells during the duration; or the UE's altitude change during the duration is higher than an altitude change threshold.

[0128] In some embodiments, the measurement configuration is associated with at least one of: a merging threshold; a maximum number of merged beams; a beam associated with a highest cell measurement result; a triggering event threshold; a reporting amount; a TTT configuration; or a measurement object and reporting configuration.

[0129] In some embodiments, the fast BFD configuration includes a timer for beam failure detection and a maximum number of beam failure instances.

[0130] In some embodiments, in a case where the total number of beam failure indications exceeds a maximum threshold of beam failure indications and BFR skipping is enabled, the UE is further configured to: skip the BFR procedure and declare RLF.

[0131] In some embodiments, the UE may start a timer for a fast RLF procedure if timer T310 is running or an N310 out-of-sync indication is received. In some embodiments, the UE may declare RLF when the timer for the fast RLF procedure expires.

[0132] Figure 7 A simplified block diagram illustrating an apparatus according to some embodiments of the present disclosure.

[0133] like Figure 7 , apparatus 700 may include at least one processor 704 and at least one transceiver 702 coupled to the processor 704. Apparatus 700 may be a UE, a BS, a RAN node, a source node, a target node, a third node, or any other device having similar functionality.

[0134] Although in this figure, elements such as at least one transceiver 702 and processor 704 are described in the singular, the plural is contemplated unless limitation to the singular is explicitly stated. In some embodiments of the present disclosure, the transceiver 702 may be divided into two devices, such as a receive circuit system and a transmit circuit system. In some embodiments of the present disclosure, the device 700 may further include an input device, a memory, and / or other components.

[0135] In some embodiments of the present disclosure, the device 700 may be a UE. The transceiver 702 and the processor 704 may interact with each other to perform Figures 1 to 6 The transceiver 702 and the processor 704 may interact with each other to perform Figures 1 to 6 The operation of the BS described in any one of .

[0136] In some embodiments of the present disclosure, the apparatus 700 may further include at least one non-transitory computer-readable medium.

[0137] For example, in some embodiments of the present disclosure, a non-transitory computer-readable medium may store computer-executable instructions to enable the processor 704 to implement the method described above with respect to the UE. For example, when the computer-executable instructions are executed, the processor 704 interacts with the transceiver 702 to perform Figures 1 to 6 Operation of the UE described in any one of .

[0138] The methods of the present disclosure may be implemented on a programmed processor. However, the controller, flow charts, and modules may also be implemented on a general or special purpose computer, a programmed microprocessor or microcontroller and peripheral integrated circuit components, an integrated circuit, a hardware electronic or logic circuit (e.g., a discrete component circuit), a programmable logic device, or the like. In general, any device having a finite state machine capable of implementing the flow charts shown in the figures may be used to implement the processing functions of the present disclosure.

[0139] Although the present disclosure has been described with its specific embodiments, it is apparent that many alternatives, modifications and variations will be apparent to those skilled in the art. For example, the various components of the embodiments may be interchanged, added or replaced in other embodiments. Moreover, all elements shown in each figure are not necessary for the operation of the disclosed embodiments. For example, a person skilled in the art of the disclosed embodiments will be able to make and use the teachings of the present disclosure by simply adopting the elements of the independent claims. Therefore, the embodiments of the present disclosure as described herein are intended to be illustrative and not restrictive. Various changes may be made without departing from the spirit and scope of the present disclosure.

[0140] In the present disclosure, relational terms (such as "first", "second" and the like) can only be used to distinguish one entity or action from another entity or action, and do not necessarily require or imply any actual such relationship or order between such entities or actions. The term "comprises, comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also may include other elements that are not explicitly listed or inherent to this process, method, article or equipment. In the absence of more constraints, an element starting with "a, an" or the like does not exclude the presence of additional identical elements in the process, method, article or equipment including the element. Moreover, the term "another" is defined as at least a second or more. As used herein, the terms "include", "have" and the like are defined as "include".

Claims

1. A user equipment UE, comprising: Transceiver; and a processor coupled to the transceiver and configured to: determining whether one or more conditions associated with movement of the UE are satisfied; and If at least one of the one or more conditions is met, at least one of the following is performed: transmitting a first indication indicating that at least one of the one or more conditions is satisfied; Adjust measurement configuration; Apply fast beam fault detection BFD configuration; Skip beam failure recovery BFR procedure; or Enables the Rapid Radio Link Failure (RLF) procedure.

2. The UE of claim 1, wherein the processor is further configured to: receiving a second instruction instructing the UE to perform at least one of the following: adjusting the measurement configuration; Apply the fast BFD configuration. Skip the BFR program; or The fast RLF procedure is enabled.

3. The UE of claim 1 , wherein the one or more conditions associated with movement of the UE include at least one of the following: A measurement event associated with the height of the UE is triggered; The height of the UE is above a first configured height threshold; The height of the UE is below a second configured height threshold; wherein the event associated with the altitude of the UE is triggered for a duration longer than a first time threshold; wherein the duration of the altitude of the UE being above the first configured altitude threshold is longer than a second time threshold; wherein the duration of the height of the UE being below the second configured height threshold is longer than a third time threshold; The vertical speed of the UE is higher than a vertical speed threshold; The vertical acceleration of the UE is higher than a vertical acceleration threshold; An average vertical speed of the UE during the duration is higher than an average vertical speed threshold during the duration; The average acceleration speed of the UE during the duration is higher than an average vertical acceleration threshold during the duration; the total number of changed beams or changed cells during the duration is above a threshold associated with the total number of changed beams or changed cells during the duration; or A change in altitude of the UE during the duration is higher than an altitude change threshold.

4. The UE according to claim 1, wherein the measurement configuration is associated with at least one of: Merge threshold; Maximum number of combined beams; The beam associated with the highest cell measurement result; Trigger event threshold; Report volume; Trigger time TTT configuration; or Measurement objects and report configuration.

5. The UE according to claim 1, wherein the fast BFD configuration includes a timer for beam failure detection and a maximum number of beam failure instances.

6. The UE of claim 1 , wherein if the total number of beam failure indications exceeds a maximum threshold of beam failure indications and BFR skipping is enabled, the processor is further configured to: The BFR procedure is skipped and RLF is declared. Claims skipped by BFR 7. The UE of claim 1, wherein the processor is further configured to: The timer for the fast RLF procedure is started if the timer T310 is running or the N310 out-of-sync indication is received.

8. The UE of claim 6, wherein the processor is further configured to: RLF is declared when the timer for the fast RLF procedure expires.

9. A base station BS, comprising: Transceiver; and a processor coupled to the transceiver and configured to: receiving a first indication from a user equipment UE indicating that at least one of the one or more conditions is satisfied; and A second instruction is transmitted to the UE instructing the UE to perform at least one of: Adjust measurement configuration; Apply fast beam fault detection BFD configuration; Skip the beam failure recovery (BFR) procedure; or Enables the Rapid Radio Link Failure (RLF) procedure.

10. A method performed by a user equipment UE, comprising: determining whether one or more conditions associated with movement of the UE are satisfied; and If at least one of the one or more conditions is met, at least one of the following is performed: transmitting a first indication indicating that at least one of the one or more conditions is satisfied; Adjust measurement configuration; Apply fast beam fault detection BFD configuration; Skip beam failure recovery BFR procedure; or Enables the Rapid Radio Link Failure (RLF) procedure.

11. The method according to claim 10, further comprising: receiving a second instruction instructing the UE to perform at least one of the following: adjusting the measurement configuration; Apply the fast BFD configuration. Skip the BFR program; or The fast RLF procedure is enabled.

12. The method of claim 10, wherein the one or more conditions associated with movement of the UE include at least one of: A measurement event associated with the height of the UE is triggered; The height of the UE is above a first configured height threshold; The height of the UE is below a second configured height threshold; wherein the event associated with the altitude of the UE is triggered for a duration longer than a first time threshold; wherein the duration of the altitude of the UE being above the first configured altitude threshold is longer than a second time threshold; wherein the duration of the height of the UE being below the second configured height threshold is longer than a third time threshold; The vertical speed of the UE is higher than a vertical speed threshold; The vertical acceleration of the UE is higher than a vertical acceleration threshold; An average vertical speed of the UE during the duration is higher than an average vertical speed threshold during the duration; The average acceleration speed of the UE during the duration is higher than an average vertical acceleration threshold during the duration; the total number of changed beams or changed cells during the duration is above a threshold associated with the total number of changed beams or changed cells during the duration; or A change in altitude of the UE during the duration is higher than an altitude change threshold.

13. The method of claim 10, wherein the measurement configuration is associated with at least one of: Merge threshold; Maximum number of combined beams; The beam associated with the highest cell measurement result; Trigger event threshold; Report volume; Trigger time TTT configuration; or Measurement objects and report configuration.

14. The method of claim 10, wherein the fast BFD configuration includes a timer for beam failure detection and a maximum number of beam failure instances.

15. The method of claim 10, wherein in a case where the total number of beam failure indications exceeds a maximum threshold of beam failure indications and BFR skipping is enabled, the processor is further configured to: The BFR procedure is skipped and RLF is declared.

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