Method and apparatus for reducing measurements on neighboring cell frequencies

Abstract

The invention relates to a method and a device for reducing measurements on neighboring cell frequencies. An embodiment of the present disclosure provides a UE comprising: a transceiver; and a processor coupled with the transceiver and configured to: receive a message indicating one or more conditions for determining whether to measure on at least one frequency band associated with at least one neighboring cell, where the one or more conditions are associated with at least one of: at least one coverage parameter of a serving cell; at least one coverage parameter of at least one neighboring cell; or at least one mobility parameter of the UE; and performing a measurement on the at least one frequency band if a neighbor cell measurement is triggered and at least one of the one or more conditions is satisfied; or suspending the triggered neighbor cell measurement if the neighbor cell measurement is triggered and any of the one or more conditions is not satisfied.

Description

Technical Field

[0001] The present disclosure relates to wireless communications, and in particular, to methods and apparatus for reducing measurements on neighbor cell frequencies. Background Art

[0002] For the scenario of overlapping deployment of non-terrestrial networks (NTN) and terrestrial networks (TN) with large differences in cell range, it may not be necessary for all user equipments (UEs) in the NTN cell to perform measurements on all possible neighboring cell frequencies (especially frequencies of neighboring TN cells), although some neighboring cells may still be far away from the UE.

[0003] It is desirable to provide a solution for reducing measurements on the Terrestrial Network (TN) frequencies for NTN-TN mobility. Summary of the invention

[0004] An embodiment of the present disclosure provides a UE, comprising: a transceiver; and a processor, which is coupled to the transceiver and configured to: receive a message indicating one or more conditions for determining whether to perform measurements on at least one frequency band associated with at least one neighboring cell, wherein the one or more conditions are associated with at least one of the following: at least one coverage parameter of a serving cell; at least one coverage parameter of at least one neighboring cell; or at least one mobility parameter of the UE; and perform measurements on the at least one frequency band when neighboring cell measurement is triggered and at least one of the one or more conditions is met; or suspend the triggered neighboring cell measurement when the neighboring cell measurement is triggered and any of the one or more conditions is not met.

[0005] In some embodiments, the one or more conditions associated with at least one coverage parameter of the serving cell are associated with one or more of: at least one distance threshold; a reference position of the serving cell; at least one delay threshold; at least one elevation angle threshold; at least one horizontal angle threshold; a reference direction of the serving cell; an identification of each beam in at least one beam; an identification of each zone in at least one zone for a side link; or at least one validity period.

[0006] In some embodiments, at least one of the one or more conditions is satisfied in response to at least one of the following: the distance between the UE and the reference location is longer than a distance threshold in the at least one distance threshold; the distance between the UE and the reference location is longer than one distance threshold in the at least one distance threshold and shorter than another distance threshold in the at least one distance threshold; the timing advance is longer than a delay threshold in the at least one delay threshold; the timing advance is longer than one delay threshold in the at least one delay threshold and shorter than another delay threshold in the at least one delay threshold; the round trip time (RTT) between the UE and the serving RAN node is longer than the delay threshold in the at least one delay threshold; the RTT between the UE and the serving RAN node is longer than one delay threshold in the at least one delay threshold and shorter than another delay threshold in the at least one delay threshold; the propagation delay between the UE and the serving RAN node is longer than the delay threshold in the at least one delay threshold threshold; the propagation delay between the UE and the serving RAN node is longer than one of the at least one delay threshold and shorter than another of the at least one delay threshold; the elevation angle between the UE and the RAN node managing the serving cell is greater than the elevation angle threshold in the at least one elevation angle threshold; the elevation angle between the UE and the RAN node managing the serving cell is greater than one of the at least one elevation angle threshold and less than another of the at least one elevation angle threshold; the horizontal angle between the direction from the UE to the reference position and the reference direction is greater than the horizontal angle threshold in the at least one horizontal angle threshold; the horizontal angle between the direction from the UE to the reference position and the reference direction is greater than one of the at least one horizontal angle threshold and less than another of the at least one horizontal angle threshold; the serving beam of the UE is included in the at least one beam; or the current position of the UE is included in the at least one area.

[0007] In some embodiments, said at least one of said one or more conditions is satisfied within said validity period.

[0008] In some embodiments, the one or more conditions associated with at least one coverage parameter of at least one neighboring cell are associated with one or more of: at least one distance threshold to a cell reference position of the at least one neighboring cell; at least one distance threshold to an area reference position of the at least one neighboring cell; at least one geographic area; or at least one zone.

[0009] In some embodiments, at least one of the one or more conditions is satisfied in response to at least one of the following: the distance between the UE and the cell reference location is shorter than one of the at least one distance threshold to the cell reference location; the distance between the UE and the regional reference location is shorter than one of the at least one distance threshold to the regional reference location; the current location of the UE is within the at least one geographic area; or the current location of the UE is within the at least one zone.

[0010] In some embodiments, the one or more conditions associated with at least one mobility parameter of the UE are associated with at least one time threshold.

[0011] In some embodiments, at least one of the one or more conditions is satisfied in response to at least one of the following: the current time is later than a time threshold among the at least one time threshold; or the current time is later than one time threshold among the at least one time threshold and earlier than another time threshold among the at least one time threshold.

[0012] In some embodiments, in a case where neighbor cell measurement is triggered by a distance between the UE and a reference position of the serving cell exceeding a distance threshold, the processor is further configured to: determine whether the one or more conditions are met based on at least one of: the reference position of the serving cell, the position of the UE, or the calculated distance between the serving cell and the UE.

[0013] In some embodiments, the processor is further configured to: transmit an indication requesting one or more update conditions, at least one update frequency band, or both.

[0014] In some embodiments, if the condition is not met, the processor is further configured to: remain camped on the serving cell.

[0015] In some embodiments, when the UE is in a CONNECTED state, the processor is further configured to transmit at least one of: reference signal received power (RSRP); reference signal received quality (RSRQ); current location of the UE; movement of the UE; at least one detected public land mobile network; or at least one neighboring cell.

[0016] In some embodiments, the message further indicates at least one of: an RSRP change threshold; a duration of an RSRP change; an RSRQ change threshold; a duration of an RSRQ change; a location change threshold; or a duration of a location change.

[0017] In some embodiments, the processor is further configured to deem the last evaluation of the one or more conditions valid and not restart the evaluation of the one or more conditions based on at least one of the following: the RSRP change is lower than the RSRP change threshold; the RSRP change is lower than the RSRP change threshold within the duration of the RSRP change; the RSRQ change is lower than the RSRQ change threshold; the RSRQ change is lower than the RSRQ change threshold within the duration of the RSRP change; the location change is shorter than the location change threshold; or the location change is shorter than the location change threshold within the duration of the location change.

[0018] In some embodiments, the processor is further configured to release the one or more conditions in response to at least one of the following: at least one other condition for determining whether to perform measurements on at least one frequency band is met; none of the one or more conditions are met; measurements on the at least one frequency band have been performed; or measurements on the at least one frequency band have been triggered due to being close to the out-of-service time of the serving cell; or measurements on the at least one frequency band are triggered after the out-of-service time of the serving cell.

[0019] In some embodiments, the message comprises a system information block or RRC signaling.

[0020] 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: determine a message indicating one or more conditions for determining whether to perform measurements on at least one frequency band associated with at least one neighboring cell, wherein the one or more conditions are associated with at least one of: at least one coverage parameter of a serving cell; at least one coverage parameter of at least one neighboring cell; or at least one mobility parameter of the UE; and transmit the message.

[0021] In some embodiments, the one or more conditions associated with at least one coverage parameter of the serving cell are associated with one or more of: at least one distance threshold; a reference position of the serving cell; at least one delay threshold; at least one elevation angle threshold; at least one horizontal angle threshold; a reference direction of the serving cell; an identification of each beam in at least one beam; an identification of each zone in at least one zone for a side link; or at least one validity period.

[0022] In some embodiments, the one or more conditions associated with at least one coverage parameter of at least one neighboring cell are associated with one or more of: at least one distance threshold to a cell reference position of the at least one neighboring cell; at least one distance threshold to an area reference position of the at least one neighboring cell; at least one geographic area; or at least one zone.

[0023] In some embodiments, the one or more conditions associated with at least one mobility parameter of the UE are associated with at least one time threshold.

[0024] In some embodiments, the processor is further configured to: receive an indication for requesting one or more update conditions, at least one update band, or both.

[0025] In some embodiments, the processor is further configured to receive at least one of: RSRP; RSRQ; a current location of the UE; movement of the UE; at least one detected public land mobile network; or at least one neighboring cell.

[0026] In some embodiments, the message further indicates at least one of: an RSRP change threshold; a duration of an RSRP change; an RSRQ change threshold; a duration of an RSRQ change; a location change threshold; or a duration of a location change.

[0027] In some embodiments, the message comprises a system information block or RRC signaling.

[0028] Another embodiment of the present disclosure provides a method for reducing measurements on frequency bands, comprising: receiving a message indicating one or more conditions for determining whether to perform measurements on at least one frequency band associated with at least one neighboring cell, wherein the one or more conditions are associated with at least one of: at least one coverage parameter of a serving cell; at least one coverage parameter of at least one neighboring cell; or at least one mobility parameter of the UE; and performing measurements on the at least one frequency band when neighboring cell measurement is triggered and at least one of the one or more conditions is met; or suspending the triggered neighboring cell measurement when neighboring cell measurement is triggered and any of the one or more conditions is not met.

[0029] Another embodiment of the present disclosure provides a method for reducing measurements on a frequency band, comprising: determining a message indicating one or more conditions for determining whether to perform measurements on at least one frequency band associated with at least one neighboring cell, wherein the one or more conditions are associated with at least one of: at least one coverage parameter of a serving cell; at least one coverage parameter of at least one neighboring cell; or at least one mobility parameter of the UE; and transmitting the message. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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 by reference to specific embodiments of the present application illustrated in the accompanying drawings. These drawings depict only example embodiments of the present application and therefore should not be considered to limit its scope.

[0031] Figure 1 The overlapping deployment of NTN cells and TN cells according to some embodiments of the present disclosure is described.

[0032] Figures 2A to 2I Conditions for determining whether to perform measurement on at least one frequency band according to some embodiments of the present disclosure are described.

[0033] Figures 3A to 3C Conditions for determining whether to perform measurement on at least one frequency band according to some embodiments of the present disclosure are described.

[0034] Figure 4 Conditions for determining whether to perform measurement on at least one frequency band according to some embodiments of the present disclosure are described.

[0035] Figure 5 A method for wireless communication performed by a UE according to some embodiments of the present disclosure is described.

[0036] Figure 6 A method for wireless communication performed by a BS according to some embodiments of the present disclosure is described.

[0037] Figure 7 A simplified block diagram illustrating an apparatus according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0038] 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 accomplished by different embodiments that are intended to be included in the spirit and scope of the present invention.

[0039] Although the operations are depicted 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 require all of the illustrated operations to be performed in order to achieve the desired result; sometimes, one or more operations may be skipped. In addition, the figures 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.

[0040] 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 (e.g., 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 above, satellite communication networks, high altitude platform networks, etc.). It is considered that with the development of network architectures and new service 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.

[0041] Figure 1 The overlapping deployment of NTN cells and TN cells according to some embodiments of the present disclosure is described.

[0042] like Figure 1 As shown in FIG, the network includes three UEs, UE1, UE2, and UE3, and two radio access network (RAN) nodes, RAN node #A and RAN node #B. The RAN nodes can be satellite or unmanned aerial system (UAS) platforms. Figure 1 Only three UEs and two satellite / UAS platforms are depicted in FIG. , but it is contemplated that any number of UEs and satellite / UAS platforms may be included in the wireless communication system.

[0043] UE may include a computing device, such as a desktop computer, a laptop computer, a personal digital assistant (PDA), a tablet computer, a smart TV (e.g., a TV connected to the Internet), a set-top box, a game console, a security system (including a security camera), a vehicle-mounted computer, a network device (e.g., a router, a switch, a modem), or the like. According to an embodiment of the present disclosure, UE may include a portable wireless communication device, a smart phone, a cellular phone, a flip phone, a device with a subscriber identity module, a personal computer, a selective call receiver, or any other device capable of sending and receiving communication signals on a wireless network. In some embodiments, UE includes a wearable device, such as a smart watch, a fitness band, an optical head-mounted display, or the like. In addition, UE may be referred to as a subscriber unit, a mobile device, a mobile station, a user, a terminal, a mobile terminal, a wireless terminal, a fixed terminal, a subscriber station, a user terminal, a device, or other terms used in the art. UE may communicate directly with a satellite BS via a service link. UE may also perform side link transmission.

[0044] A typical terrestrial communication network includes one or more base stations (generally referred to as "BSs") located on the earth (i.e., not in the air or on air), each providing a geographical radio coverage area, and UEs that can transmit and receive data within the radio coverage area. In a terrestrial communication network, the BS and the UE can communicate with each other via a communication link, for example, via a downlink radio frame from the BS to the UE or via an uplink radio frame from the UE to the BS.

[0045] RAN nodes (e.g., satellites) may include low earth orbit (LEO) satellites, medium earth orbit (MEO) satellites, geosynchronous orbit (GEO) satellites whose positions are fixed to the earth, and highly elliptical orbit (HEO) satellites orbiting the earth. According to various embodiments, the satellite may be implemented with a transparent or regenerative payload. When the satellite carries a transparent payload, it only performs RF filtering, frequency conversion and / or amplification of the onboard signal. Therefore, the waveform signal repeated by the payload remains unchanged. When the satellite carries a regenerative payload, in addition to performing RF filtering, frequency conversion and amplification, it also performs other signal processing functions, such as demodulation / decoding, switching and / or routing, onboard encoding / decoding and modulation / demodulation. In other words, for a satellite with a regenerative payload, all or part of the base station functions (e.g., gNB, eNB, etc.) are implemented on board.

[0046] UAS platforms may include unmanned aerial systems (UAS), including tethered UAS and lighter-than-air UAS (LTA), heavier-than-air UAS (HTA), and high altitude platform UAS (HAP).

[0047] Hereinafter, in the present disclosure, a RAN node may include: a satellite carrying a transparent payload, a satellite carrying a regenerative payload, a UAS platform, a BS, or the like.

[0048] Figure 1 The wireless communication system shown in the may be compatible with any type of network capable of sending and receiving wireless communication signals. For example, the wireless communication system is compatible with a wireless communication network, a cellular telephone network, a network based on time division multiple access (TDMA), a network based on code division multiple access (CDMA), a network based on orthogonal frequency division multiple access (OFDMA), an LTE network, a network based on the third generation partnership project (3GPP), a 3GPP 5G network, a satellite communication network, a high altitude platform network, and / or other communication networks.

[0049] In one embodiment, the wireless communication system is compatible with NR of the 3GPP protocol, wherein the BS transmits using an OFDM modulation scheme on the DL and the UE transmits using a single carrier frequency division multiple access (SC-FDMA) scheme or an OFDM scheme on the UL. However, more generally, the wireless communication system may implement some other open or proprietary communication protocols, such as WiMAX and other protocols.

[0050] In other embodiments, the BS may communicate using other communication protocols, such as the IEEE 802.11 family of wireless communication protocols. In addition, in some embodiments, the BS may communicate via a licensed spectrum, while in other embodiments, the BS may communicate via an unlicensed spectrum. The present disclosure is not intended to be limited to any particular wireless communication system architecture or protocol implementation. In another embodiment, the BS may communicate with the UE using a 3GPP 5G protocol.

[0051] Still refer to Figure 1 , RAN nodes can provide geographic cells for UEs located in geographic cells. For example, RAN node #A can provide services for UEs located in NTN cell #A, and RAN node #B can provide services for UEs located in NTN cell #B. There are also several TN cells - TN cell #1, TN cell #2, TN cell #3 and TN cell #4.

[0052] Since the height of satellite-borne antennas is much higher (the maximum height may be 35786 km), the NTN cell may have a much larger coverage area (eg, a cell range of more than 1000 km) than the coverage area of ​​the TN cell (eg, a cell range of less than 10 km).

[0053] In the old NR or LTE protocols designed for TN, for mobility purposes, the serving cell may broadcast the frequencies of neighboring cells in the system information so that UEs in the IDLE state or the INACTIVE state can search and measure possible neighboring cells on these frequencies; the serving cell may also indicate the frequencies of neighboring cells in the RRC signaling so that UEs in the CONNECTED state can perform measurements and report to the network for handover procedures. Due to the limited range and continuous deployment of TN cells, the serving cell usually broadcasts or indicates the frequencies of all possible neighboring cells.

[0054] However, in the scenario of overlapping deployment of NTN cells and TN cells with large differences in cell range, it may not be necessary for all UEs in the NTN cell to perform measurements on all possible neighboring cell frequencies (especially frequencies of neighboring TN cells), although some neighboring cells may still be far away from the UE.

[0055] For example, if Figure 1 : UE1 is close to TN cell #1 and TN cell #2, so it is desirable to measure on the frequencies of TN cell #1 and TN cell #2, but not on the frequencies of TN cell #3 and TN cell #4. UE2 is close to TN cell #3 and TN cell #4, so it is desirable to measure on the frequencies of TN cell #3 and TN cell #4, but not on the frequencies of TN cell #1 and TN cell #2. UE3 is not positioned near any TN cell, and it is desirable not to measure on any frequency of the TN cell.

[0056] In summary, a UE in an NTN cell may not wish to make measurements on the frequencies of one or more TN cells that are not close enough.

[0057] However, if the legacy NR or LTE protocol of TN is applied, the RAN node (e.g., RAN node #A) may broadcast all possible frequencies of TN cell #1, TN cell #2, TN cell #3, and TN cell #4 in the system information, and the UE may perform some unnecessary measurements.

[0058] In view of the above, for idle / inactive state mobility, the present disclosure proposes some solutions for reducing unnecessary measurements on at least one frequency of a neighboring cell, and the frequency may be used by a TN cell far away from the UE. These solutions may also be applicable to UEs in a connected state.

[0059] Specifically, the present disclosure proposes that the BS may transmit an indication to the UE to indicate one or more conditions for determining whether to perform measurements on at least one frequency band associated with at least one neighboring cell. The indication may include a system information block. Alternatively, the indication may include RRC signaling, for example, when the UE transitions from a connected state to an idle state or an inactive state, the BS may transmit an RRC release message to the UE, which may include an indication.

[0060] Based on different conditions (hereinafter referred to as "conditions") for determining whether to perform measurements on at least one frequency band associated with at least one neighboring cell, a solution is presented as follows:

[0061] Solution 1

[0062] In solution 1, one or more conditions for determining whether to perform measurements on at least one frequency band associated with at least one neighboring cell may be associated with coverage parameters of a serving cell (e.g., an NTN cell). Specifically, the conditions may include at least one of the following:

[0063] 1. At least one distance threshold;

[0064] 2. A reference position of the serving cell, which may be indicated in the indication. If no reference position is indicated, a default reference position may be used, such as the center of the serving cell;

[0065] 3. At least one delay threshold;

[0066] 4. At least one elevation threshold;

[0067] 5. At least one horizontal angle threshold;

[0068] 6. A reference direction of the serving cell, which may be indicated in the indication. In the case where no reference direction is indicated, a default or preconfigured reference position may be used;

[0069] 7. At least one identification of at least one beam in the serving cell;

[0070] 8. At least one zone identity for a sidelink; or

[0071] 9. At least one validity period of the condition, each of the above parameters in 1 to 8 can be associated with a validity period.

[0072] After receiving the conditions, and in the case where neighbor cell measurement is triggered at the UE, the UE may evaluate one or more conditions to determine whether at least one condition is met. In the case where at least one condition is met, the UE may measure on at least one frequency band associated with the corresponding condition.

[0073] The UE may evaluate one or more conditions according to the following options:

[0074] Option 1-1: The condition may be associated with at least one distance threshold.

[0075] In some embodiments, the condition may be associated with a distance threshold, and the UE may determine whether the distance between the UE and the reference position of the serving cell is greater than or equal to the distance threshold or less than or equal to the distance threshold. In the case where the distance between the UE and the reference position of the serving cell is greater than or equal to the distance threshold, the UE may perform measurements on at least one frequency band associated with the distance threshold. In the case where the distance between the UE and the reference position of the serving cell is less than or equal to the distance threshold, the UE may not perform measurements on at least one frequency band associated with the distance threshold.

[0076] Figure 2A Conditions for determining whether to perform measurement on at least one frequency band according to some embodiments of the present disclosure are described.

[0077] exist Figure 2AIn the example, there is one NTN cell and three TN cells. The reference position of the serving cell (i.e., the "NTN cell reference position") may be the center of the serving cell, and there is a distance threshold (i.e., the "threshold"). In the case where the distance between the UE and the reference position of the serving cell is greater than or equal to the distance threshold, the UE may measure on at least one frequency band associated with the distance threshold. In the case where the distance between the UE and the reference position of the serving cell is less than or equal to the distance threshold (the UE may be located in the inner circle), the UE may not measure on at least one frequency band associated with the distance threshold.

[0078] In some other embodiments, the condition may be associated with two distance thresholds, and the UE may determine the distance between the UE and the reference location of the serving cell and compare the distance with each distance threshold. When the distance between the UE and the reference location of the serving cell is between the two distance thresholds (i.e., greater than or equal to one distance threshold and less than or equal to the other distance threshold), the UE may measure on at least one frequency band associated with the two distance thresholds. When the distance is outside the two distance thresholds (i.e., greater than the two distance thresholds or less than the two distance thresholds), the UE may not measure on at least one frequency band associated with the two distance thresholds.

[0079] Figure 2B Conditions for determining whether to perform measurement on at least one frequency band according to some embodiments of the present disclosure are described.

[0080] exist Figure 2B In the figure, there are two distance thresholds, namely, "threshold 1" and "threshold 2". In the case where the distance between the UE and the reference location (i.e., "NTN cell reference location") is between the two thresholds (i.e., greater than or equal to threshold 2 and less than or equal to threshold 1), the UE may perform measurements on at least the frequency bands associated with the two distance thresholds. For example, when the UE is positioned in the annular area marked by a dot, the UE may perform measurements on at least the frequency bands associated with the two distance thresholds.

[0081] In some embodiments, the condition may be associated with N distance thresholds (N is an integer and N ≥ 3), which may be represented as: D1, D2, ..., D N , where D1 <D2<…<D N The distance between the UE and the reference location (which may be represented as: d) may be within one of N+1 different ranges, and the N+1 different ranges may be: d <D1、D1≤d<D2、D2≤d<D3、…、D N≤d. Each range may be associated with at least one frequency band, or may not be associated with a frequency band (the UE may not perform measurements on any frequency band), and when the distance between the UE and the reference position is within one of the N+1 ranges, the UE may perform a corresponding operation associated with the range, which may be performing measurements on at least one frequency band associated with the range, or not performing measurements on any frequency band.

[0082] Option 1-2: The condition may be associated with at least one latency threshold.

[0083] The UE may determine at least one of the following values:

[0084] Timing Advance (TA) maintained by the UE;

[0085] UE-specific timing advance derived by the UE;

[0086] The RTT between the UE and the serving RAN node; or

[0087] Propagation delay between the UE and the serving RAN node.

[0088] The condition may be associated with a delay threshold, and the UE may compare the TA maintained by the UE (or a UE-specific TA, RTT, or propagation delay derived by the UE) with the delay threshold. If the TA maintained by the UE is greater than or equal to the delay threshold, the UE may measure on at least one frequency band associated with the delay threshold; and if the TA maintained by the UE is less than or equal to the delay threshold, the UE may not measure on at least one frequency band associated with the delay threshold.

[0089] The condition may be associated with two delay thresholds, and the UE may compare the TA maintained by the UE (or a UE-specific TA, RTT, or propagation delay derived by the UE) with each delay threshold. In the case where the TA maintained by the UE is between the two delay thresholds (i.e., greater than or equal to one delay threshold and less than or equal to the other delay threshold), the UE may measure on at least one frequency band associated with the two delay thresholds. In the case where the TA maintained by the UE is outside the two delay thresholds, the UE may not measure on at least one frequency band associated with the two delay thresholds.

[0090] In some embodiments, the condition may be associated with N latency thresholds (N is an integer and N ≥ 3), which may be represented as: L1, L2, ..., L N , where L1 <L2<…<L N The TA maintained by the UE (which may be denoted as: l) may be within one of N+1 different ranges, and the N+1 different ranges may be: l <L1、L1≤l<L2、L2≤l<L3、…、L N≤1. Each range may be associated with at least one frequency band, or may not be associated with a frequency band (the UE may not perform measurements on any frequency band), and when the TA maintained by the UE is within one of the N+1 ranges, the UE may perform a corresponding operation associated with the range, which may be performing measurements on at least one frequency band associated with the range, or not performing measurements on any frequency band.

[0091] Option 1-3: The condition may be associated with at least one elevation angle threshold.

[0092] The condition may be associated with an elevation angle threshold, and the UE may compare the elevation angle between the UE and a RAN node (e.g., a satellite) of a serving cell with the elevation angle threshold. When the elevation angle is greater than or equal to the elevation angle threshold, the UE may perform measurements on at least one frequency band associated with the elevation angle threshold; and when the elevation angle is less than or equal to the elevation angle threshold, the UE may not perform measurements on at least one frequency band associated with the elevation angle threshold.

[0093] The condition may be associated with two elevation angle thresholds, and the UE may compare the elevation angle with each elevation angle threshold. When the elevation angle is between the two elevation angle thresholds (i.e., greater than or equal to one elevation angle threshold and less than or equal to the other elevation angle threshold), the UE may measure on at least one frequency band associated with the two elevation angle thresholds. When the elevation angle is outside the two elevation angle thresholds, the UE may not measure on at least one frequency band associated with the two elevation angle thresholds.

[0094] In some embodiments, the condition may be associated with N elevation angle thresholds (N is an integer and N ≥ 3), which may be represented as: E1, E2, ..., E N , where E1 <E2<…<E N The elevation angle (which may be denoted as: e) between the UE and the RAN node (eg, satellite) serving the cell may be within one of N+1 different ranges, and the N+1 different ranges may be: e <E1、E1≤e<E2、E2≤e<E3、…、E N ≤e. Each range may be associated with at least one frequency band, or may not be associated with a frequency band (the UE may not perform measurements on any frequency band), and when the elevation angle is within one of the N+1 ranges, the UE may perform a corresponding operation associated with the range, which may be to perform measurements on at least one frequency band associated with the range, or to perform measurements on no frequency band.

[0095] Figure 2C Conditions for determining whether to perform measurement on at least one frequency band according to some embodiments of the present disclosure are described.

[0096] exist Figure 2CIn the example, there is one NTN cell and three TN cells, and the condition is associated with a latency threshold. In the case where the TA maintained by the UE (or the UE-specific TA, RTT, or propagation delay derived by the UE) is less than or equal to the latency threshold, the UE may be positioned in the inner circle and may not measure on at least one frequency band associated with the latency threshold. In the case where the elevation angle between the UE and the RAN node is less than the elevation angle threshold, the UE may also be positioned in the inner circle and may not measure on at least one frequency band associated with the latency threshold.

[0097] In the case where the TA maintained by the UE (or the UE-specific TA, RTT or propagation delay derived by the UE) is greater than or equal to the latency threshold, the UE may be positioned outside the inner circle and may measure on at least one frequency band associated with the latency threshold. In the case where the elevation angle between the UE and the RAN node is greater than the elevation threshold, the UE may also be positioned outside the inner circle and may not measure on at least one frequency band associated with the latency threshold.

[0098] Figure 2D Conditions for determining whether to perform measurement on at least one frequency band according to some embodiments of the present disclosure are described.

[0099] exist Figure 2D In the example, there is one NTN cell and three TN cells, and the condition is associated with two delay thresholds.

[0100] In the case where the TA maintained by the UE (or the UE-specific TA, RTT or propagation delay derived by the UE) is between two delay thresholds (i.e., greater than or equal to one delay threshold and less than or equal to the other delay threshold), the UE may be positioned in the annular area marked by the dots and the UE may measure on at least the frequency band associated with the two delay thresholds. Otherwise, the UE may not measure on at least the frequency band associated with the two delay thresholds.

[0101] In the case where the elevation angle between the UE and the RAN node is between two elevation angle thresholds, the UE may be positioned in the annular area marked by the dot (i.e., greater than or equal to one elevation angle threshold and less than or equal to the other elevation angle threshold), and the UE may perform measurements on at least the frequency bands associated with the two elevation angle thresholds. Otherwise, the UE may not perform measurements on at least the frequency bands associated with the two elevation angle thresholds.

[0102] Option 1-4: The condition may be associated with at least one horizontal angle threshold.

[0103] The condition may be associated with a horizontal angle threshold, and the UE may compare the horizontal angle between the direction from the UE to the reference position of the serving cell relative to the default direction (or the indicated reference direction) with the horizontal angle threshold.

[0104] When the horizontal angle is greater than or equal to the horizontal angle threshold, the UE may perform measurements on at least one frequency band associated with the horizontal angle threshold. When the horizontal angle is less than or equal to the horizontal angle threshold, the UE may not perform measurements on at least one frequency band associated with the horizontal angle threshold.

[0105] The condition may be associated with two horizontal angle thresholds, and the UE may compare the horizontal angle between the directions from the UE to the reference position of the serving cell with each horizontal angle threshold. When the horizontal angle is between the two horizontal angle thresholds (i.e., greater than or equal to one horizontal angle threshold and less than or equal to the other horizontal angle threshold), the UE may perform measurements on at least one frequency band. When the horizontal angle is outside the two horizontal angle thresholds, the UE may not perform measurements on at least one frequency band.

[0106] In some embodiments, the condition may be associated with N horizontal angle thresholds (N is an integer and N ≥ 3), which may be represented as: H1, H2, ..., H N , where H1 <H2<…<H N The horizontal angle (which may be expressed as: h) between the direction from the UE to the reference position of the serving cell relative to the default direction may be within one of N+1 different ranges, and the N+1 different ranges may be: h N ≤h. Each range may be associated with at least one frequency band, or may not be associated with a frequency band (the UE may not perform measurements on any frequency band), and when the horizontal angle is within one of the N+1 ranges, the UE may perform a corresponding operation associated with the range, which may be to perform measurements on at least one frequency band associated with the range, or to perform measurements on no frequency band.

[0107] Figure 2E Conditions for determining whether to perform measurement on at least one frequency band according to some embodiments of the present disclosure are described.

[0108] exist Figure 2E In the example, there is one NTN cell and one TN cell. The reference position of the serving cell (ie, the "NTN cell reference position") may be the center of the cell, and there is one reference direction (ie, the "reference direction").

[0109] ​There are two horizontal angle thresholds, namely, "Threshold 3" and "Threshold 4". In the case where the horizontal angle between the direction from the UE to the reference position relative to the reference direction is within the two thresholds (e.g., greater than or equal to the horizontal angle threshold 3 and less than or equal to the horizontal angle threshold 4), the UE may be positioned in the area marked by the dots and may perform measurements on at least the frequency band associated with the two horizontal angle thresholds. In the case where the horizontal angle between the direction from the UE to the reference position relative to the reference direction is not within the two thresholds, the UE may be positioned outside the area marked by the dots and may not perform measurements on at least the frequency band associated with the two horizontal angle thresholds.

[0110] Figure 2F Conditions for determining whether to perform measurement on at least one frequency band according to some embodiments of the present disclosure are described.

[0111] Figure 2F In the reference direction Figure 2E Different, in Figure 2F In the indication, the reference direction is not a default direction or a preconfigured direction, which may be indicated in the indication, and the UE may determine the horizontal angle based on the indicated reference direction.

[0112] Option 1-5: The condition may be associated with at least one identification of at least one beam in the serving cell.

[0113] The coverage of the NTN network may be associated with the number of beams, and each beam may be associated with an identity. The condition may be associated with at least one identity of at least one beam in the serving cell.

[0114] The UE may select a beam in the serving cell, which may be included in the at least one beam, and the UE may perform measurements on at least a frequency band associated with an identifier of the selected beam. In the event that the selected beam is not included in the at least one beam, the UE may not perform measurements on at least the frequency band.

[0115] Figure 2G Conditions for determining whether to perform measurement on at least one frequency band according to some embodiments of the present disclosure are described.

[0116] exist Figure 2G There is one NTN cell and three TN cells. Several beams are included in the NTN coverage, such as beams 1 to 3 (the coverage areas of beams 1 to 3 are circles marked by dots), beams 4, 5, 6, ...

[0117] The condition may be associated with several beams, for example, beam 1, beam 2, and beam 3. In the case that the UE selects any one of beam 1, beam 2, or beam 3, the UE may perform measurements on at least the frequency band associated with the identity of the selected beam. In the case that the UE selects any beam except beam 1, beam 2, or beam 3, the UE may not perform measurements on at least the frequency band.

[0118] Option 1-6: The condition may be associated with at least one zone identification for the sidelink.

[0119] The UE may support sidelink transmission, and several zones may be used for sidelink transmission. The NTN coverage may include multiple zones. A condition may be associated with at least one zone.

[0120] The UE may be located in a region, the region may be included in the at least one region, and the UE may perform measurements on at least a frequency band associated with an identifier of the location region. In the case where the located region is not included in the at least one region, the UE may not perform measurements on at least a frequency band associated with an identifier of the location region.

[0121] Figure 2H Conditions for determining whether to perform measurement on at least one frequency band according to some embodiments of the present disclosure are described.

[0122] exist Figure 2H In the NTN coverage, there is one NTN cell and one TN cell. Several areas may be included in the NTN coverage, such as area 1 to area 9.

[0123] The condition may be associated with several zones, for example, zone 5, zone 6, zone 8, and zone 9. In the case where the UE is located in any one of zone 5, zone 6, zone 8, and zone 9 associated with the condition, the UE may perform measurements on at least the frequency band associated with the zone identity. In the case where the UE is located in any one (for example, zone 1) other than zone 5, zone 6, zone 8, and zone 9, the UE may not perform measurements on at least the frequency band associated with the zone identity.

[0124] It should be noted that any of the above conditions may be combined together, for example, a condition may be associated with both a distance threshold and a horizontal angle threshold.

[0125] Fig.2I Two conditions for determining whether to perform measurement on at least one frequency band according to some embodiments of the present disclosure are described.

[0126] exist Fig.2IIn the present invention, there are two horizontal angle thresholds (i.e., threshold A and threshold B) and two distance thresholds (i.e., threshold C and threshold D). When the horizontal angle between the direction from the UE to the reference position relative to the default direction is between the two thresholds (i.e., greater than or equal to threshold A and less than or equal to threshold B) and the distance between the UE and the reference position is between the two thresholds (i.e., greater than or equal to threshold C and less than or equal to threshold D), the UE may perform measurements on at least the frequency band associated with the four thresholds. Fig.2I As shown in FIG. 1 , the UE may be positioned in the area marked by the dots and may perform measurements on at least the frequency bands associated with the four thresholds. Otherwise, the UE may not perform measurements on at least the frequency bands associated with the four thresholds.

[0127] In some embodiments, when the reference location of the serving cell is indicated for distance-based neighbor cell measurement triggering, the UE may also reuse the reference location of the serving cell for evaluation of associated conditions. For example, the UE may use the reference location of the serving cell in option 1-1.

[0128] In some embodiments, in the case where neighbor cell measurements are triggered because the distance between the UE and its serving cell reference position (e.g., cell center) is greater than a threshold (e.g., distanceThresh), the UE position or calculated distance (between the UE and its serving cell reference position) may be reused for the evaluation of associated conditions without triggering a new UE position acquisition or distance calculation process.

[0129] In some embodiments, at least one of the one or more conditions may be associated with a validity period, and when the validity period expires, the UE may request to update the frequency band (or frequency list) and the associated conditions. The validity period of each condition may be the same, or may be different for different conditions.

[0130] In some embodiments, the condition may not be met and the UE may not perform measurements on any frequency, ie, the UE may stop neighbor cell measurements for the duration. The UE may remain camped on the serving cell.

[0131] Solution 2

[0132] In solution 2, one or more conditions for determining whether to perform measurements on at least one frequency band associated with at least one neighboring cell may be associated with coverage parameters of the neighboring cell (e.g., a TN cell). Specifically, the conditions may include at least one of the following:

[0133] 1. At least one distance threshold to a cell reference position of at least one neighboring cell;

[0134] 2. at least one distance threshold to the regional reference position of at least one neighboring cell;

[0135] 3. at least one geographical area; or

[0136] 4. At least one zone.

[0137] After receiving the conditions, and in the case where neighbor cell measurement is triggered at the UE, the UE may evaluate one or more conditions to determine whether at least one condition is met. If at least one condition is met, the UE may measure on at least one frequency band associated with the corresponding condition.

[0138] The UE may evaluate one or more conditions according to the following options:

[0139] Option 2-1: The condition may be associated with at least one distance threshold to a cell reference position of at least one neighboring cell.

[0140] In some embodiments, the condition may be associated with a distance threshold to a cell reference position of at least one neighboring cell. The UE may determine whether the distance between the UE and the reference position of at least one neighboring cell is greater than or equal to the distance threshold or less than or equal to the distance threshold. In the case where the distance between the UE and the reference position of at least one neighboring cell is greater than or equal to the distance threshold, the UE may not measure on at least one frequency band associated with the distance threshold. In the case where the distance between the UE and the reference position of at least one neighboring cell is less than or equal to the distance threshold, the UE may measure on at least one frequency band associated with the distance threshold.

[0141] Figure 3A Conditions for determining whether to perform measurement on at least one frequency band according to some embodiments of the present disclosure are described.

[0142] exist Figure 3A In the example, there is one NTN cell and one TN cell. The reference position of the TN cell (i.e., the "reference position") may be the center of the neighboring cell, and there is a distance threshold (i.e., the "threshold"). In the case where the distance between the UE and the reference position of the TN cell is greater than or equal to the distance threshold, the UE may not perform measurements on at least one frequency band associated with the distance threshold. In the case where the distance between the UE and the reference position of the TN cell is less than or equal to the distance threshold (the UE may be positioned in a circle marked by a dot, the circle may be centered at the reference position and have a radius of the value of the "threshold"), the UE may perform measurements on at least one frequency band associated with the distance threshold.

[0143] The condition may be associated with two or more distance thresholds, and the UE may apply similar operations as option 1-1.

[0144] Option 2-2: The condition may be associated with at least one distance threshold to an area reference location of at least one neighboring cell.

[0145] In this option, the reference position is a regional reference position or a geographical location of at least one neighboring cell. The reference position may not be the center of at least one neighboring cell. In some embodiments, the regional reference position may be indicated without any additional information about the region.

[0146] The UE may determine whether the distance between the UE and the regional reference position is greater than or equal to the distance threshold or less than or equal to the distance threshold. In the case where the distance between the UE and the regional reference position is greater than or equal to the distance threshold, the UE may not measure on at least one frequency band associated with the distance threshold. In the case where the distance between the UE and the regional reference position is less than or equal to the distance threshold, the UE may measure on at least one frequency band associated with the distance threshold.

[0147] In some embodiments, the regional reference location may be a geographic coordinate in the region.

[0148] Figure 3B Conditions for determining whether to perform measurement on at least one frequency band according to some embodiments of the present disclosure are described.

[0149] exist Figure 3B In the example, there is one NTN cell and three TN cells. The regional reference positions (i.e., “regional reference positions”) of the three TN cells may be the centers of the three TN cells, and there is a distance threshold (i.e., “threshold”). It should be noted that Figure 3B The regional reference position depicted in is an example of a regional reference position, and in other embodiments, the regional reference position may be any position within the region. In still other embodiments, the regional reference position may be indicated without any additional information about the region.

[0150] In the case where the distance between the UE and the reference positions of the three TN cells is greater than or equal to the distance threshold, the UE may not perform measurements on at least one frequency band associated with the distance threshold. In the case where the distance between the UE and the reference positions of the three TN cells is less than or equal to the distance threshold (the UE may be positioned in a circle marked by a dot, the circle may be centered at the regional reference position and have a radius of the value of "threshold"), the UE may perform measurements on at least one frequency band associated with the distance threshold.

[0151] The condition may be associated with two or more distance thresholds, and the UE may apply similar operations as option 1-1.

[0152] Option 2-3: The condition may be associated with at least one geographic region.

[0153] The UE may determine whether the location of the UE is within at least one geographic area. In the case where the location of the UE is within the at least one geographic area, the UE may perform measurements on at least one frequency band associated with the geographic area. In the case where the location of the UE is not within the at least one geographic area, the UE may not perform measurements on at least one frequency band associated with the geographic area.

[0154] Figure 3C Conditions for determining whether to perform measurement on at least one frequency band according to some embodiments of the present disclosure are described.

[0155] exist Figure 3C In the example, there is one NTN cell and two TN cells. There is a geographical area, in which the two TN cells are also within the geographical area. Information of the geographical area may be indicated, and the information is associated with at least one frequency band associated with the two TN cells. In the case where the UE's location is in the geographical area (the area marked by the dot), the UE may perform measurements on at least one frequency band. In the case where the UE's location is not in the geographical area, the UE may not perform measurements on at least one frequency band.

[0156] Option 2-4: The condition may be associated with at least one zone identification for the sidelink.

[0157] The UE may support sidelink transmission and several zones may be used for sidelink transmission. The TN coverage may include multiple zones. The condition may be associated with at least one identification of at least one zone.

[0158] The UE may be located in a region, the region may be included in the at least one region, and the UE may perform measurements on at least a frequency band associated with the region identifier. In the case where the located region is not included in the at least one region, the UE may not perform measurements on at least a frequency band associated with a TN cell associated with the region identifier.

[0159] It should be noted that any of the above conditions may be combined together, for example, a condition may be associated with both a distance threshold and at least one identification of at least one geographical area.

[0160] In some embodiments, when neighbor cell measurements are triggered because the distance between the UE and its serving cell reference position (e.g., cell center) is greater than a threshold (e.g., distanceThresh), the UE position can be reused for the evaluation of the associated conditions without triggering a new UE position acquisition process. For example, the UE position can be used in options 2-1, 2-2, or 2-3.

[0161] In some embodiments, the condition may not be met and the UE may not perform measurements on any frequency, ie, the UE may stop neighbor cell measurements for the duration. The UE may remain camped on the serving cell.

[0162] Solution 3

[0163] In solution 3, the network may transmit dedicated signaling to the UE indicating one or more conditions for determining whether to perform measurements on at least one frequency band associated with at least one neighboring cell. The one or more conditions may be associated with mobility parameters of the UE. Specifically, the one or more conditions may include at least one time threshold.

[0164] The network may know the mobility parameters of the UE, such as the UE's moving speed, the UE's moving direction, the UE's moving start position, etc. Based on these mobility parameters, the BS may determine at least one time threshold or at least one time range (each time range may have two time thresholds), and the UE may measure on at least one frequency band associated with at least one time threshold or at least one time range. For example, the BS may know the mobility parameters of the UE when the UE is in a connected state, and when the UE transitions from a connected state to an idle state or an inactive state, the BS may transmit an RRC release message indicating the above indication. In some other embodiments, the indication may be included in an RRC suspend message.

[0165] In some embodiments, one or more conditions may be associated with a time threshold, and when neighbor cell measurement is triggered, the UE may determine whether the current time is earlier or later than at least one time threshold.

[0166] If the current time is earlier than at least one time threshold, the UE may perform measurements on at least one frequency band associated with the time threshold. If the current time is later than at least one time threshold, the UE may not perform measurements on at least one frequency band associated with the time threshold.

[0167] In other embodiments, one or more conditions may be associated with two time thresholds (ie, time ranges), and when neighbor cell measurement is triggered, the UE may determine whether the current time is between the two time thresholds.

[0168] If the current time is between the two time thresholds, the UE may measure on at least one frequency band associated with the time threshold. If the current time is not between the two time thresholds, the UE may not measure on at least one frequency band associated with the time threshold.

[0169] Figure 4 Conditions for determining whether to perform measurement on at least one frequency band according to some embodiments of the present disclosure are described.

[0170] exist Figure 4In the example, there is one NTN cell and two TN cells. The UE may move in the direction indicated by the arrow. Based on the mobility information of the UE, when the UE transitions from the RRC connected state to the RRC idle or RRC inactive state, the BS may transmit RRC signaling, such as an RRC release message, to the UE, indicating one or more conditions associated with at least one time threshold or at least one time range. For example, the condition may be associated with "time threshold 1" to "time threshold 2".

[0171] When the current time is between the time range from "time threshold 1" to "time threshold 2", the UE may measure on at least one frequency band associated with the two time thresholds. When the current time is outside the time range, the UE may not measure on at least one frequency band associated with the two time thresholds.

[0172] In some embodiments, the network may configure a connected UE to report the location (and movement) or detected PLMN or neighboring cells and then transmit an RRC release or RRC suspend message to help determine the associated time threshold or time range.

[0173] In some embodiments, the UE may request an update of the frequency band (or frequency list) and associated conditions if the current time is later than any indicated time threshold or time range.

[0174] Solution 4

[0175] In some embodiments, the BS may further transmit an indication to the UE indicating a broad evaluation of one or more conditions for determining whether to perform measurements on at least one frequency band associated with at least one neighboring cell. Specifically, the indication may indicate at least one of the following:

[0176] 1. RSRP change threshold;

[0177] 2. Duration of RSRP change;

[0178] 3.RSRQ change threshold;

[0179] 4. Duration of RSRQ change;

[0180] 5. Location change threshold; or

[0181] 6. Duration of position change.

[0182] In the case where the UE has evaluated one or more conditions to perform measurements or not to perform measurements on at least one frequency band, and the UE may consider the last evaluation of the one or more conditions as valid and not restart the evaluation of the one or more conditions in one of the following cases:

[0183] 1. RSRP change is lower than RSRP change threshold;

[0184] In some embodiments, RSRP change may be determined during a duration from a last evaluation.

[0185] 2. The RSRP change is below the RSRP change threshold during the duration of the RSRP change;

[0186] 3. The RSRQ change is lower than the RSRQ change threshold;

[0187] In some embodiments, RSRQ change may be determined during a duration from a last evaluation.

[0188] 4. The RSRQ change is below the RSRQ change threshold for the duration of the RSRP change;

[0189] 5. The position change is shorter than the position change threshold;

[0190] In some embodiments, the change in position may be determined over a duration since the last evaluation; or

[0191] 6. The position change is shorter than the position change threshold within the duration of the position change.

[0192] Solution 5

[0193] In some embodiments, the UE may maintain (or keep) one or more conditions as explained in the above solutions 1 to 3 or release the one or more conditions. In particular, the UE may release the one or more conditions in the following cases:

[0194] 1. At least one other condition for determining whether to perform measurements on at least one frequency band is met;

[0195] 2. One or more conditions are not met;

[0196] 3. Measurements on at least one frequency band have been performed; or

[0197] 4. Measurements on at least one frequency band have been triggered due to approaching the out-of-service time (e.g., t-Service) of the serving cell; or

[0198] 5. Measurement on at least one frequency band is triggered after the out-of-service time of the serving cell.

[0199] Otherwise, at least one condition may be maintained at the UE.

[0200] Figure 5 A method for wireless communication performed by a UE according to some embodiments of the present disclosure is described.

[0201] In operation 501, the UE may receive a message indicating one or more conditions for determining whether to perform measurements on at least one frequency band associated with at least one neighboring cell, wherein the one or more conditions are associated with at least one of the following: at least one coverage parameter of a serving cell; at least one coverage parameter of at least one neighboring cell; or at least one mobility parameter of the UE. In operation 502, measurements are performed on at least one frequency band if neighboring cell measurement is triggered and at least one of the one or more conditions is satisfied. Alternatively, in operation 503, the UE may suspend the triggered neighboring cell measurement if neighboring cell measurement is triggered and any of the one or more conditions is not satisfied.

[0202] In some embodiments, the one or more conditions associated with at least one coverage parameter of the serving cell are associated with one or more of: at least one distance threshold; a reference position of the serving cell; at least one delay threshold; at least one elevation angle threshold; at least one horizontal angle threshold; a reference direction of the serving cell; an identification of each beam in at least one beam; an identification of each zone in at least one zone for a side link; or at least one validity period.

[0203] In some embodiments, at least one of the one or more conditions is satisfied in response to at least one of:

[0204] - The distance between the UE and the reference location is longer than a distance threshold in at least one distance threshold (e.g. Figure 2A );

[0205] - the distance between the UE and the reference location is longer than one of the at least one distance threshold and shorter than another of the at least one distance threshold (e.g. Figure 2B );

[0206] - a timing advance greater than a delay threshold in at least one delay threshold (e.g., Figure 2C );

[0207] - a timing advance that is longer than one of the at least one delay threshold and shorter than another of the at least one delay threshold (e.g., Figure 2D );

[0208] - The round trip time (RTT) between the UE and the serving RAN node is longer than a delay threshold in at least one delay threshold (e.g. Figure 2C );

[0209] - The RTT between the UE and the serving RAN node is longer than one of the at least one delay threshold and shorter than another of the at least one delay threshold (e.g. Figure 2D );

[0210] - the propagation delay between the UE and the serving RAN node is longer than a delay threshold in at least one delay threshold (e.g. Figure 2C );

[0211] - the propagation delay between the UE and the serving RAN node is longer than one of the at least one delay threshold and shorter than another of the at least one delay threshold (e.g. Figure 2D );

[0212] - the elevation angle between the UE and the RAN node managing the serving cell is greater than an elevation angle threshold in at least one elevation angle threshold (e.g. Figure 2C );

[0213] - the elevation angle between the UE and the RAN node managing the serving cell is greater than one of the at least one elevation angle threshold and less than another of the at least one elevation angle threshold (e.g. Figure 2D );

[0214] - a horizontal angle between the direction from the UE to the reference position and the reference direction is greater than a horizontal angle threshold in at least one horizontal angle threshold;

[0215] - the horizontal angle between the direction from the UE to the reference position and the reference direction is greater than one of the at least one horizontal angle threshold and less than another of the at least one horizontal angle threshold (e.g., Figure 2E and Figure 2F );

[0216] - The serving beam of the UE is contained in at least one beam (e.g. Figure 2G );or

[0217] - The current location of the UE is contained in at least one zone (e.g. Figure 2H ).

[0218] In some embodiments, at least one of the one or more conditions is satisfied within the validity period.

[0219] In some embodiments, one or more conditions associated with at least one coverage parameter of at least one neighboring cell are associated with one or more of: at least one distance threshold to a cell reference position of at least one neighboring cell; at least one distance threshold to an area reference position of at least one neighboring cell; at least one geographic area; or at least one zone.

[0220] In some embodiments, at least one of the one or more conditions is satisfied in response to at least one of the following: the distance between the UE and the cell reference location is shorter than one of at least one distance threshold to the cell reference location (e.g., Figure 3A); The distance between the UE and the regional reference location is shorter than one of the at least one distance thresholds to the regional reference location (e.g., Figure 3B ); The current location of the UE is within at least one geographic area (e.g., Figure 2C ); or the current location of the UE is within at least one zone.

[0221] In some embodiments, the one or more conditions associated with at least one mobility parameter of the UE are associated with at least one time threshold.

[0222] In some embodiments, at least one of the one or more conditions is satisfied in response to at least one of the following: the current time is later than a time threshold in the at least one time threshold; or the current time is later than one time threshold in the at least one time threshold and earlier than another time threshold in the at least one time threshold (e.g., Figure 4 ).

[0223] In some embodiments, when a neighbor cell measurement is triggered by a distance between a UE and a reference position of a serving cell exceeding a distance threshold, the UE may determine whether one or more conditions are met based on at least one of: the reference position of the serving cell, the position of the UE, or the calculated distance between the serving cell and the UE.

[0224] In some embodiments, the UE may transmit an indication requesting one or more update conditions, at least one update band, or both.

[0225] In some embodiments, if the conditions are not met, the UE may remain camped on the serving cell.

[0226] In some embodiments, when the UE is in a connected state, the UE may transmit at least one of: reference signal received power (RSRP); reference signal received quality (RSRQ); current location of the UE; movement of the UE; at least one detected public land mobile network; or at least one neighboring cell.

[0227] In some embodiments, the message further indicates at least one of: an RSRP change threshold; a duration of an RSRP change; an RSRQ change threshold; a duration of an RSRQ change; a location change threshold; or a duration of a location change.

[0228] In some embodiments, the UE may consider the last evaluation of one or more conditions valid and not restart the evaluation of one or more conditions based on at least one of the following: RSRP change is lower than the RSRP change threshold; RSRP change is lower than the RSRP change threshold for the duration of the RSRP change; RSRQ change is lower than the RSRQ change threshold; RSRQ change is lower than the RSRQ change threshold for the duration of the RSRP change; location change is shorter than the location change threshold; or location change is shorter than the location change threshold for the duration of the location change.

[0229] In some embodiments, the UE may release one or more conditions in response to at least one of the following: at least one other condition for determining whether to perform measurements on at least one frequency band is met; one or more conditions are not met; measurements on at least one frequency band have been performed; or measurements on at least one frequency band have been triggered due to being close to the out-of-service time of the serving cell; or measurements on at least one frequency band are triggered after the out-of-service time of the serving cell.

[0230] Figure 6 A method for wireless communication performed by a BS according to some embodiments of the present disclosure is described.

[0231] In operation 601, the BS may determine a message indicating one or more conditions for determining whether to perform measurement on at least one frequency band associated with at least one neighboring cell, wherein the one or more conditions are associated with at least one of: at least one coverage parameter of a serving cell; at least one coverage parameter of at least one neighboring cell; or at least one mobility parameter of a UE. In operation 602, the BS may transmit a message.

[0232] Figure 7 A simplified block diagram illustrating an apparatus according to some embodiments of the present disclosure.

[0233] 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.

[0234] Although in this figure, elements are described in singular form, such as at least one transceiver 702 and processor 704, plural form is contemplated unless limitation to the singular form is explicitly stated. In some embodiments of the present disclosure, transceiver 702 may be divided into two devices, such as a receiving circuit system and a transmitting circuit system. In some embodiments of the present disclosure, device 700 may further include an input device, a memory and / or other components.

[0235] 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 In some embodiments of the present disclosure, the device 700 may be a node. The transceiver 702 and the processor 704 may interact with each other to perform Figures 1 to 6 The operation of a node described in any of .

[0236] In some embodiments of the present disclosure, the apparatus 700 may further include at least one non-transitory computer-readable medium.

[0237] 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 .

[0238] 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 node method described above. For example, when the computer-executable instructions are executed, the processor 704 interacts with the transceiver 702 to perform Figures 1 to 6 The operation of a node described in any of .

[0239] 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.

[0240] Although the present disclosure has been described using specific embodiments of the present disclosure, 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 interchangeable, added, or substituted in other embodiments. Moreover, all of the 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 set forth herein are intended to be illustrative rather than restrictive. Various changes may be made without departing from the spirit and scope of the present disclosure.

[0241] In the present disclosure, for example, the relational terms of "first", "second" and the like can be used alone to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions. The term "comprises / comprising" or any other variation 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. The elements starting with "a / an" or the like do not exclude the presence of additional identical elements in the process, method, article or equipment including the elements without more constraints. Moreover, the term "another" is defined as at least the 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: Receiving a message indicating one or more conditions for determining whether to perform measurements on at least one frequency band associated with at least one neighboring cell, wherein the one or more conditions are associated with at least one of: at least one coverage parameter of the serving cell; at least one coverage parameter of at least one neighbouring cell; or at least one mobility parameter of the UE; and performing measurement on the at least one frequency band if neighbor cell measurement is triggered and at least one of the one or more conditions is satisfied; or The triggered neighbor cell measurement is suspended if the neighbor cell measurement is triggered and any of the one or more conditions are not satisfied.

2. The UE of claim 1 , wherein the one or more conditions associated with at least one coverage parameter of the serving cell are associated with one or more of: at least one distance threshold; The reference location of the serving cell; At least one latency threshold; at least one elevation angle threshold; at least one horizontal angle threshold; The reference direction of the serving cell; an identification of each of the at least one beam; an identification of each of the at least one zone for the sidelink; or At least one validity period.

3. The UE of claim 2, wherein at least one of the one or more conditions is satisfied in response to at least one of: The distance between the UE and the reference location is longer than a distance threshold in the at least one distance threshold; The distance between the UE and the reference location is longer than one of the at least one distance threshold and shorter than another of the at least one distance threshold; The timing advance is longer than a delay threshold in the at least one delay threshold; The timing advance is longer than one of the at least one delay threshold and shorter than another of the at least one delay threshold; The round trip time RTT between the UE and the serving RAN node is longer than a delay threshold in the at least one delay threshold; The RTT between the UE and the serving RAN node is longer than one of the at least one delay threshold and shorter than another delay threshold of the at least one delay threshold; The propagation delay between the UE and the serving RAN node is longer than a delay threshold of the at least one delay threshold; The propagation delay between the UE and the serving RAN node is longer than one of the at least one delay threshold and shorter than another of the at least one delay threshold; an elevation angle between the UE and the RAN node managing the serving cell is greater than an elevation angle threshold in the at least one elevation angle threshold; An elevation angle between the UE and the RAN node managing the serving cell is greater than one of the at least one elevation angle threshold and less than another elevation angle threshold of the at least one elevation angle threshold; A horizontal angle between a direction from the UE to the reference position and the reference direction is greater than a horizontal angle threshold in the at least one horizontal angle threshold; A horizontal angle between a direction from the UE to the reference position and the reference direction is greater than one of the at least one horizontal angle threshold and less than another horizontal angle threshold of the at least one horizontal angle threshold; The serving beam of the UE is included in the at least one beam; or The current location of the UE is contained in the at least one zone. The UE according to claim 3 , wherein the at least one condition among the one or more conditions is satisfied within the validity period.

5. The UE of claim 1 , wherein the one or more conditions associated with at least one coverage parameter of at least one neighboring cell are associated with one or more of: at least one distance threshold to a cell reference position of the at least one neighboring cell; at least one distance threshold to an area reference position of the at least one neighboring cell; at least one geographic region; or At least one zone.

6. The UE of claim 5, wherein at least one of the one or more conditions is satisfied in response to at least one of: The distance between the UE and the cell reference location is shorter than one of the at least one distance thresholds to the cell reference location; The distance between the UE and the regional reference location is shorter than one of the at least one distance thresholds to the regional reference location; The current location of the UE is within the at least one geographical area; or The current location of the UE is within the at least one zone.

7. The UE of claim 1, wherein the one or more conditions associated with at least one mobility parameter of the UE are associated with at least one time threshold.

8. The UE of claim 7, wherein at least one of the one or more conditions is satisfied in response to at least one of: The current time is later than a time threshold in the at least one time threshold; or The current time is later than one time threshold of the at least one time threshold and earlier than another time threshold of the at least one time threshold.

9. The UE of claim 1, wherein the message further indicates at least one of the following: RSRP change threshold; Duration of RSRP change; RSRQ change threshold; Duration of RSRQ changes; position change threshold; or Duration of the position change.

10. The UE of claim 9, wherein the processor is further configured to consider a last evaluation of the one or more conditions as valid and not restart evaluation of the one or more conditions based on at least one of: The RSRP change is lower than the RSRP change threshold; The RSRP change is below the RSRP change threshold for the duration of the RSRP change; The RSRQ change is lower than the RSRQ change threshold; The RSRQ change is below the RSRQ change threshold for the duration of the RSRP change; The position change is shorter than the position change threshold; or The position change is shorter than the position change threshold within the duration of the position change.

11. The UE of claim 1 , wherein the processor is further configured to release the one or more conditions in response to at least one of: at least one other condition for determining whether to perform measurements on at least one frequency band is satisfied; one or more of the conditions are not met; Measurements on the at least one frequency band have been performed; or The measurement on the at least one frequency band has been triggered due to approaching an out-of-service time of the serving cell; or The measurement on the at least one frequency band is triggered after the out-of-service time of the serving cell.

12. A base station BS, comprising: Transceiver; and a processor coupled to the transceiver and configured to: Determining a message indicating one or more conditions for determining whether to perform measurements on at least one frequency band associated with at least one neighboring cell, wherein the one or more conditions are associated with at least one of: at least one coverage parameter of the serving cell; at least one coverage parameter of at least one neighbouring cell; or at least one mobility parameter of the UE; and The message is transmitted.

13. The BS of claim 12, wherein the one or more conditions associated with at least one coverage parameter of a serving cell are associated with one or more of: at least one distance threshold; The reference location of the serving cell; At least one latency threshold; at least one elevation angle threshold; at least one horizontal angle threshold; The reference direction of the serving cell; an identification of each of the at least one beam; an identification of each of the at least one zone for the sidelink; or At least one validity period.

14. The BS of claim 12, wherein the one or more conditions associated with at least one coverage parameter of at least one neighboring cell are associated with one or more of: at least one distance threshold to a cell reference position of the at least one neighboring cell; at least one distance threshold to an area reference position of the at least one neighboring cell; at least one geographic region; or At least one zone.

15. A method for reducing measurements on a frequency band, comprising: Receiving a message indicating one or more conditions for determining whether to perform measurements on at least one frequency band associated with at least one neighboring cell, wherein the one or more conditions are associated with at least one of: at least one coverage parameter of the serving cell; at least one coverage parameter of at least one neighbouring cell; or at least one mobility parameter of the UE; and performing measurement on the at least one frequency band if neighbor cell measurement is triggered and at least one of the one or more conditions is satisfied; or The triggered neighbor cell measurement is suspended if the neighbor cell measurement is triggered and any of the one or more conditions are not satisfied.

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