Methods and apparatuses for an event based layer-1 (L1) measurement report from a medium access control (MAC) layer of a user equipment (UE)
Patent Information
- Application Number
- PCT/CN2024/123034
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-07-10
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Figure CN2024123034_10072025_PF_FP_ABST
Abstract
Description
METHODS AND APPARATUSES FOR AN EVENT BASED LAYER-1 (L1) MEASUREMENT REPORT FROM A MEDIUM ACCESS CONTROL (MAC) LAYER OF A USER EQUIPMENT (UE)TECHNICAL FIELD
[0001] The present application relates to wireless communications, and more specifically to methods and apparatuses for an event based layer-1 (L1) measurement report from a medium access control (MAC) layer of a user equipment (UE) .BACKGROUND
[0002] A wireless communications system may include one or multiple network communication devices, such as base stations, which may support wireless communications for one or multiple user communication devices, which may be otherwise known as user equipment (UE) , or other suitable terminology. The wireless communications system may support wireless communications with one or multiple user communication devices by utilizing resources of the wireless communication system (e.g. time-domain resources (e.g. symbols, slots, subframes, frames, or the like) or frequency-domain resources (e.g. subcarriers, carriers, or the like) . Additionally, the wireless communications system may support wireless communications across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, among other suitable radio access technologies beyond 5G (e.g. sixth generation (6G) ) .SUMMARY
[0003] An article "a" before an element is unrestricted and understood to refer to "at least one" of those elements or "one or more" of those elements. The terms "a, " "at least one, " "one or more, " and "at least one of one or more" may be interchangeable. As used herein, including in the claims, "or" as used in a list of items (e.g. a list of items prefaced by a phrase such as "at least one of" or "one or more of" or "one or both of" ) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) . Also, as used herein, the phrase "based on" shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as "based on condition A" may be based on both a condition A and a condition B without departing from the scope of the present application. In other words, as used herein, the phrase "based on" shall be construed in the same manner as the phrase "based at least in part on. Further, as used herein, including in the claims, a "set" may include one or more elements.
[0004] Some implementations of the present application provide a user equipment (UE) . The UE includes at least one memory; and at least one processor coupled to the at least one memory and configured to cause the UE to: transmit capability information indicating that the UE supports an event based layer-1 (L1) measurement report; receive a first configuration related to a L1 measurement report, wherein the first configuration includes information of at least one event; and transmit the L1 measurement report in response to fulfillment of the at least one event.
[0005] In some implementations of the UE described herein, the information of the at least one event includes at least one of the following: identifier (ID) information of the at least one event; one or more offsets for the at least one event; one or more hysteresis parameters for the at least one event; one or more thresholds for the at least one event; one or more filter parameters for the at least one event; or time to trigger (TTT) associated with the at least one event.
[0006] In some implementations of the UE described herein, the at least one event includes at least one of the following: a current beam of a serving cell of the UE becomes worse than a first threshold; any beam of a candidate cell becomes an amount of offset better than the current beam of the serving cell; any beam of the candidate cell becomes better than a second threshold; or the current beam of the serving cell becomes worse than a third threshold and any beam of the candidate cell becomes better than a fourth threshold.
[0007] In some implementations of the UE described herein, a physical layer of the UE is configured to: evaluate whether an entering condition for the at least one event is fulfilled or not; and deliver first information to a medium access control (MAC) layer of the UE, wherein the first information indicates that the entering condition for the at least one event is fulfilled or not fulfilled.
[0008] In some implementations of the UE described herein, after the at least one event is considered as fulfilled, a physical layer of the UE is configured to: evaluate whether a leaving condition for the at least one event is fulfilled or not; and deliver second information to a medium access control (MAC) layer of the UE, wherein the second information indicates that the leaving condition for the at least one event is fulfilled or not fulfilled.
[0009] In some implementations of the UE described herein, at least one of the first information or the second information includes identifier (ID) information of the at least one event.
[0010] In some implementations of the UE described herein, the MAC layer of the UE is configured to: determine whether all the first information received from the physical layer of the UE during a time window configured for the at least one event indicates that an entering condition for the at least one event is fulfilled; and if all the first information indicates that the entering condition for the at least one event is fulfilled, determine that the at least one event is fulfilled, and trigger a first L1 measurement report.
[0011] In some implementations of the UE described herein, the MAC layer of the UE is configured to: determine whether all the second information received from the physical layer during a time window configured for the at least one event indicates that a leaving condition for the at least one event is fulfilled; and if all the second information indicates that the leaving condition for the at least one event is fulfilled, trigger a second L1 measurement report.
[0012] In some implementations of the UE described herein, the L1 measurement report is transmitted via a medium access control (MAC) control elements (CE) ; and the MAC CE includes at least one of the following: quality of a current beam of a serving cell of the UE; quality of one beam that is involved in the at least one event, wherein the at least one event is triggered; quality of one or more best beams of one neighbor cell, wherein any beam from the one neighbor cell is involved in the at least one event that is triggered, and a maximum number of the one or more best beams for the one neighbour cell can be configured by the network; only quality of one or more best beams of one or more neighbour cells that is greater than a threshold configured by a network, wherein a maximum number of the one or more neighbour cells can be configured by the network, and a maximum number of the one or more best beams for each neighbour cell within the one or more neighbour cells can be configured by the network; or an indication to indicate that the L1 measurement report is triggered by fulfillment of an entering condition or a leaving condition for the at least one event.
[0013] In some implementations of the UE described herein, the MAC CE includes: two or more L1 measurement reports triggered by two or more events within the at least one event; and identifier (ID) information of each of the two or more events.
[0014] In some implementations of the UE described herein, a MAC protocol data unit (PDU) can contain at most one MAC CE including the L1 measurement report.
[0015] In some implementations of the UE described herein, the at least one processor is configured to cause the UE to cancel one or more MAC CEs including the L1 measurement report for the at least one event that are triggered prior to assembling the MAC PDU, when the MAC PDU including the one MAC CE is transmitted.
[0016] In some implementations of the UE described herein, a medium access control (MAC) layer of the UE is configured to perform at least one of the following: assembling a MAC protocol data unit (PDU) to contain at most one MAC CE including the L1 measurement report per event within in the at least one event, wherein the one MAC CE includes different contents for each event within the at least one event; or assembling the MAC PDU to contain a first MAC CE including the L1 measurement report for a first event within the at least one event; and triggering a second MAC CE including the L1 measurement report for the first event after assembling the MAC PDU but before transmitting the MAC PDU; or when transmitting the MAC PDU containing the first MAC CE including the L1 measurement report for the first event, cancelling one or more MAC CEs including the L1 measurement report for the first event that are triggered prior to assembling the MAC PDU.
[0017] In some implementations of the UE described herein, if a MAC protocol data unit (PDU) cannot accommodate one MAC CE including the L1 measurement report, the MAC PDU includes a truncated MAC CE including the L1 measurement report for the at least one event.
[0018] In some implementations of the UE described herein, the truncated MAC CE includes only one beam for each neighbor cell of the UE.
[0019] In some implementations of the UE described herein, the at least one processor is configured to cause the UE to apply a logical channel prioritization (LCP) procedure when a transmission is performed by the UE, wherein: a medium access control (MAC) control element (CE) for a buffer status report (BSR) or an extended BSR has a priority higher than a MAC CE including the L1 measurement report; and the MAC CE including the L1 measurement report has a priority higher than a MAC CE for a positioning measurement gap activation or deactivation request.
[0020] In some implementations of the UE described herein, the at least one processor is configured to cause the UE to: determine that at least one L1 measurement report has been triggered and not cancelled; and if one or more uplink (UL) resources are available for a transmission and the one or more UL resources can accommodate a medium access control (MAC) control element (CE) and a sub-header of the MAC CE and the at least one L1 measurement report, instruct a multiplexing and assembly procedure to generate the MAC CE;or if the one or more UL resources are not available or if the one or more UL resources cannot accommodate the MAC CE and the sub-header of the MAC CE, trigger a scheduling request (SR) transmission.
[0021] In some implementations of the UE described herein, the SR transmission is triggered if the SR transmission is configured with a value enabled.
[0022] Some implementations of the present application provide a processor for wireless communication, comprising at least one controller coupled with at least one memory and configured to cause the processor to: transmit capability information indicating that the UE supports an event based layer-1 (L1) measurement report; receive a first configuration related to a L1 measurement report, wherein the first configuration includes information of at least one event; and transmit the L1 measurement report in response to fulfillment of the at least one event.
[0023] Some implementations of the present application provide a method performed by a user equipment (UE) . The method includes: transmitting capability information indicating that the UE supports an event based layer-1 (L1) measurement report; receiving a first configuration related to a L1 measurement report, wherein the first configuration includes information of at least one event; and transmitting the L1 measurement report in response to fulfillment of the at least one event.
[0024] Some implementations of the present application provide a base station (BS) . The BS includes at least one memory; and at least one processor coupled to the at least one memory and configured to cause the BS to: receive, from a user equipment (UE) , capability information indicating that the UE supports an event based layer-1 (L1) measurement report; transmit, to the UE, a first configuration related to a L1 measurement report, wherein the first configuration includes information of at least one event; and receive, from the UE, the L1 measurement report in response to fulfillment of the at least one event.
[0025] In some implementations of the BS described herein, the information of the at least one event includes at least one of the following: identifier (ID) information of the at least one event; one or more offsets for the at least one event; one or more hysteresis parameters for the at least one event; one or more thresholds for the at least one event; one or more filter parameters for the at least one event; or time to trigger (TTT) associated with the at least one event.
[0026] In some implementations of the BS described herein, the at least one event includes at least one of the following: a current beam of a serving cell of the UE becomes worse than a first threshold; any beam of a candidate cell becomes an amount of offset better than the current beam of the serving cell; any beam of the candidate cell becomes better than a second threshold; or the current beam of the serving cell becomes worse than a third threshold and any beam of the candidate cell becomes better than a fourth threshold.
[0027] In some implementations of the BS described herein, the L1 measurement report is transmitted via a medium access control (MAC) control elements (CE) ; and the MAC CE includes at least one of the following: quality of one beam that is involved in the at least one event, wherein the at least one event is triggered; quality of one or more best beams of one neighbor cell, wherein any beam from the one neighbor cell is involved in the at least one event that is triggered, and a maximum number of the one or more best beams for the one neighbour cell can be configured by the network; only quality of one or more best beams of one or more neighbour cells that is greater than a threshold configured by a network, wherein a maximum number of the one or more neighbour cells can be configured by the network, and a maximum number of the one or more best beams for each neighbour cell within the one or more neighbour cells can be configured by the network; or an indication to indicate that the L1 measurement report is triggered by fulfillment of an entering condition or a leaving condition for the at least one event.
[0028] In some implementations of the BS described herein, the MAC CE includes two or more L1 measurement reports triggered by two or more events within the at least one event; and identifier (ID) information of each of the two or more events.
[0029] In some implementations of the BS described herein, a MAC protocol data unit (PDU) can contain at most one MAC CE including the L1 measurement report.
[0030] In some implementations of the BS described herein, if a MAC protocol data unit (PDU) cannot accommodate one MAC CE including the L1 measurement report, the MAC PDU includes a truncated MAC CE including the L1 measurement report for the at least one event.
[0031] In some implementations of the BS described herein, the truncated MAC CE includes only one beam for each neighbor cell of the UE.
[0032] In some implementations of the BS described herein, a medium access control (MAC) control element (CE) for a buffer status report (BSR) or an extended BSR has a priority higher than a MAC CE including the L1 measurement report; and the MAC CE including the L1 measurement report has a priority higher than a MAC CE for a positioning measurement gap activation or deactivation request.
[0033] In some implementations of the BS described herein, the at least one processor is configured to cause the BS to: if one or more uplink (UL) resources are available for a transmission and the one or more UL resources can accommodate a medium access control (MAC) control element (CE) and a sub-header of the MAC CE and the at least one L1 measurement report, receive, from the UE, the MAC CE including the L1 measurement report; and if the one or more UL resources are not available or if the one or more UL resources cannot accommodate the MAC CE and the sub-header of the MAC CE, receive a scheduling request (SR) transmission from the UE.
[0034] In some implementations of the BS described herein, the SR transmission is triggered if the SR transmission is configured with a value enabled.
[0035] Some implementations of the present application provide a processor for wireless communication, comprising at least one controller coupled with at least one memory and configured to cause the processor to: receive, from a user equipment (UE) , capability information indicating that the UE supports an event based layer-1 (L1) measurement report; transmit, to the UE, a first configuration related to a L1 measurement report, wherein the first configuration includes information of at least one event; and receive, from the UE, the L1 measurement report in response to fulfillment of the at least one event.
[0036] Some implementations of the present application provide a method performed by a base station (BS) . The method includes: receiving, from a user equipment (UE) , capability information indicating that the UE supports an event based layer-1 (L1) measurement report; transmitting, to the UE, a first configuration related to a L1 measurement report, wherein the first configuration includes information of at least one event; and receiving, from the UE, the L1 measurement report in response to fulfillment of the at least one event.BRIEF DESCRIPTION OF THE DRAWINGS
[0037] Figure 1 illustrates an example of a wireless communications system in accordance with aspects of the present application.
[0038] Figure 2 illustrates an example of a user equipment (UE) 200 in accordance with aspects of the present application.
[0039] Figure 3 illustrates an example of a processor 300 in accordance with aspects of the present application.
[0040] Figure 4 illustrates an example of a network equipment (NE) 400 in accordance with aspects of the present application.
[0041] Figures 5 and 6 illustrate flowcharts of methods related to an event based L1 measurement report in accordance with aspects of the present application.
[0042] Figures 7 and 8 illustrate schematic diagrams of transmitting an event based L1 measurement report in accordance with aspects of the present application.DETAILED DESCRIPTION
[0043] In general, when a UE moves from one cell to another cell, at some point a serving cell change needs to be performed. In the legacy, the serving cell change is done by explicit radio resource control (RRC) reconfiguration signalling (e.g. a handover (HO) command) to trigger the synchronization of a target cell based on Layer-3 (L3) measurements report. It leads to longer latency, larger overhead, and longer interruption time than beam level mobility. Therefore, in 3GPP, LTM was approved to change a serving cell via L1 / L2 signalling, in order to reduce the latency, overhead and interruption time.
[0044] Layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) is a procedure in which a network equipment (e.g. a BS) receives L1 measurement report (s) from a UE, and on their basis the BS changes UE’s serving cell by a cell switch command signaled via a medium access control (MAC) control element (CE) . The cell switch command indicates an LTM candidate cell configuration that the BS previously prepared and provided to the UE through RRC signalling. Then the UE switches to the target cell according to the cell switch command. The LTM can be used to reduce the mobility latency. LTM may also be named as L1 / L2 lower layer-Triggered Mobility or the like.
[0045] Master cell group (MCG) LTM is a PCell switch procedure that the network triggers via a MAC CE based on L1 measurements. Secondary cell group (SCG) LTM is a PSCell switch procedure that the network triggers via a MAC CE based on L1 measurements.
[0046] In an MCG LTM procedure or an LTM PCell switch procedure from a source cell (or source PCell) to a target cell (or target PCell) in a dual connectivity scenario, a node which generates an RRC Reconfiguration message for the MCG LTM switch procedure or the LTM PCell switch procedure, or which determines to initiate MCG LTM may be a MN or a CU of the MN.
[0047] In an SCG LTM procedure or an LTM PSCell switch procedure from a source PSCell to a target PSCell in a dual connectivity scenario, a node which generates an RRC Reconfiguration message for the SCG LTM switch procedure or the LTM PSCell switch procedure, or which determines to initiate SCG LTM may be a MN or an SN or a CU of the MN or a CU of the SN, furthermore, the SN may be a node to which the serving PSCell or source PSCell belongs (e.g. a source SN) , or the SN may be a node to which the target PSCell for LTM belongs (e.g. a target SN) .
[0048] Currently, the following LTM events based on beam specific quality of a serving cell and candidate cells may be supported as L1 LTM measurement events.
[0049] - Event#1: Beam (s) of a serving cell becomes better than an absolute threshold;
[0050] - Event#2: Beam (s) of a serving cell becomes worse than an absolute threshold;
[0051] - Event#3: Beam (s) of a candidate cell becomes offset better than beam (s) of a serving cell;
[0052] - Event#4: Beam (s) of a candidate cell becomes better than an absolute threshold;
[0053] - Event#5: Beam (s) of a serving cell becomes worse than an absolute threshold AND Beam (s) of a candidate cell becomes better than another absolute threshold.
[0054] For example, solution for E1 (Event#1: Beam (s) of a serving cell becomes better than an absolute threshold) is as follows:
[0055] (1) Entering condition:
[0056] - Option E1-1a: A number m is configured by network. If m =1, it is fixed in the specification. Namely, the configuration from network is not needed.
[0057] - Alternative#1: UE considers the entering condition for this event to be fulfilled when condition E1-1 is fulfilled for the m beams.
[0058] - Alternative#2: UE considers the entering condition for this event to be fulfilled when condition E1-1 is fulfilled based on the average of the m beams.
[0059] The m beams could be the best m beams from the serving cell in this option.
[0060] - Option E1-1b: A number m and threshold for beam filtering are configured by network.
[0061] - UE considers the entering condition for this event to be fulfilled when condition E1-1 is fulfilled based on the average of the best minimum (m1, m) beams. There are m1 beams of the serving cell meeting the threshold. Ms is the average of minimum (m1, m) beams of the serving cell.
[0062] (2) Leaving condition:
[0063] - Option E1-2a: A number m is configured by network. If m =1, it is fixed in the specification. Namely, the configuration from network is not needed.
[0064] - Alternative#1: UE considers the leaving condition for this event to be fulfilled when condition E1-2 is fulfilled for the best beam.
[0065] - Alternative#2: UE considers the leaving condition for this event to be fulfilled when condition E1-2 is fulfilled for the mth beam (based on the beam quality) .
[0066] - Alternative#3: UE considers the leaving condition for this event to be fulfilled when condition E1-2 is fulfilled for any one beam from the best m beams.
[0067] - Alternative#4: UE considers the leaving condition for this event to be fulfilled when condition E1-2 is fulfilled based on the average of the m beams.
[0068] The m beams could be the best m beams from the serving cell in this option.
[0069] - Option E1-2b: A number m and threshold for beam filtering are configured by network.
[0070] - UE considers the entering condition for this event to be fulfilled when condition E1-1 is fulfilled based on the average of the best minimum (m1, m) beams. There are m1 beams of the serving cell meeting the threshold. Ms is the average of minimum (m1, m) beams of the serving cell.
[0071] Inequality E1-1 (Entering condition)
[0072] Mbs –Hys > Thresh
[0073] Inequality E1-2 (Leaving condition)
[0074] Mbs + Hys < Thresh
[0075] The variables in the formula are defined as follows:
[0076] Mbs is the measurement result of the beam of the serving cell.
[0077] Hys is the hysteresis parameter for this event.
[0078] Thresh is the threshold parameter for this event.
[0079] Solution for E2 (Event#2: Beam (s) of a serving cell becomes worse than an absolute threshold) is as follows:
[0080] (1) Entering condition:
[0081] - Option E2-1a: A number m is configured by network. If m =1, it is fixed in the specification. Namely, the configuration from network is not needed.
[0082] - Alternative#1: UE considers the entering condition for this event to be fulfilled when condition E2-1 is fulfilled for the best beam.
[0083] - Alternative#2: UE considers the entering condition for this event to be fulfilled when condition E2-1 is fulfilled for the mth beam.
[0084] - Alternative#3: UE considers the entering condition for this event to be fulfilled when condition E2-1 is fulfilled based on the average of the m beams.
[0085] The m beams could be the best m beams from the serving cell in this option.
[0086] - Option E2-1b: A number m and threshold for beam filtering are configured by network.
[0087] - UE considers the entering condition for this event to be fulfilled when condition E2-1 is fulfilled based on the average of the best minimum (m1, m) beams. There are m1 beams of the serving cell meeting the threshold. Ms is the average of minimum (m1, m) beams of the serving cell.
[0088] (2) Leaving condition:
[0089] - Option E2-2a: A number m is configured by network. If m =1, it is fixed in the specification. Namely, the configuration from network is not needed.
[0090] - Alternative#1: UE considers the leaving condition for this event to be fulfilled when condition E2-2 is fulfilled for the best m beams.
[0091] - Alternative#2: UE considers the leaving condition for this event to be fulfilled when condition E2-2 is fulfilled based on the average of the m beams.
[0092] The m beams could be the best m beams from the serving cell in this option.
[0093] - Option E2-2b: A number m and threshold for beam filtering are configured by network.
[0094] - UE considers the entering condition for this event to be fulfilled when condition E2-2 is fulfilled based on the average of the best minimum (m1, m) beams. There are m1 beams of the serving cell meeting the threshold. Ms is the average of minimum (m1, m) beams of the serving cell.
[0095] Inequality E2-1 (Entering condition)
[0096] Mbs + Hys < Thresh
[0097] Inequality E2-2 (Leaving condition)
[0098] Mbs –Hys > Thresh
[0099] The variables in the formula are defined as follows:
[0100] Mbs is the measurement result of the beam of the serving cell.
[0101] Hys is the hysteresis parameter for this event.
[0102] Thresh is the threshold parameter for this event.
[0103] Solution for E3 (Event#3: Beam (s) of a candidate cell becomes offset better than beam (s) of a serving cell) is as follows:
[0104] (1) Entry condition:
[0105] - Option E3-1a: A number m is configured by network.
[0106] - Alternative#1: UE considers the entering condition for this event to be fulfilled when condition E3-1 is fulfilled for each beam from the best m beams.
[0107] - Alternative#2: UE considers the entering condition for this event to be fulfilled when condition E3-1 is fulfilled based on the average of the best m beams.
[0108] - Option E3-1b: A number m and a threshold for beam filtering is configured by network.
[0109] - Alternative#1: UE considers the entering condition for this event to be fulfilled when condition E3-1 is fulfilled for each beam from the best minimum (m1, m2 and m) beams. The number m is configured by network. One threshold is configured by the network to UE. Only the beam which is greater than the threshold can be selected for checking entering or leaving condition. There are m1 beams of the serving cell meeting the threshold. There are m2 beams of the serving cell meeting the threshold.
[0110] √ For example, if Mn used in E3-1 is the best beam from the neighbour cell, Mp used in E3-2 is also the best beam from the serving cell. If Mn used in E3-1 is the second-best beam from the neighbour cell, Mp used in E3-2 is also the second-best beam from the serving cell. And so on.
[0111] - Alternative#2: UE considers the entering condition for this event to be fulfilled when condition E3-2 is fulfilled based on the average of beams of serving cell and neighbour cell. There are m1 beams of the serving cell meeting the threshold. There are m2 beams of the neighbour cell meeting the threshold. Mn is the average of minimum (m2, m) beams of neighbour cell. Mp is the average of minimum (m1, m) beams of serving cell.
[0112] (2) Leaving condition:
[0113] - Option E3-2a: A number m is configured by network.
[0114] - Alternative#1: UE considers the leaving condition for this event to be fulfilled when condition E3-2 is fulfilled for one of the best m beams.
[0115] - Alternative#2: UE considers the leaving condition for this event to be fulfilled when condition E3-2 is fulfilled based on the average of the best m beams.
[0116] - Option E3-2b: A number m and a threshold for beam filtering is configured by network.
[0117] - Alternative#1: UE considers the leaving condition for this event to be fulfilled when condition E3-2 is fulfilled for one beam from serving cell and neighbour cell, which is one of the best minimum (m1, m2 and m) beams. The number m is configured by network. One threshold may be configured for UE. Only the beam which is greater than the threshold can be selected for checking leaving condition. There are m1 beams of the serving cell meeting the threshold. There are m2 beams of the neighbour cell meeting the threshold.
[0118] √ For example, if Mbn used in E3-2 is the best beam of the best f minimum (m1, m2 and m) beams from the neighbour cell, Mbp used in E3-2 is also the best beam of the best f minimum (m1, m2 and m) beams from the serving cell. If Mn used in E3-2 is the second-best beam from the neighbour cell, Mbp used in E3-2 is also the second-best beam from the serving cell. And so on.
[0119] - Alternative#2: UE considers the leaving condition for this event to be fulfilled when condition E3-2 is fulfilled based on the average of beams of serving cell and neighbour cell. There are m1 beams of the serving cell meeting the threshold. There are m2 beams of the neighbour cell meeting the threshold. Mn is the average of best minimum (m2, m) beams of neighbour cell. Mp is the average of the best minimum (m2, m) beams of serving cell. Or the average for the serving cell can be calculated based on the minimum (m1, m2, m) beams of serving cell. The average for the neighobur cell can be calculated based on the minimum (m1, m2, m) beams of neighbor cell.
[0120] - use the SpCell for Mbp, Ofp and Ocp.
[0121] Inequality E3-1 (Entering condition)
[0122] Mbn + Ofn + Ocn –Hys > Mbp + Ofp + Ocp + Off
[0123] Inequality E3-2 (Leaving condition)
[0124] Mbn + Ofn + Ocn + Hys < Mbp + Ofp + Ocp + Off
[0125] The variables in the formula are defined as follows:
[0126] Mbn is the measurement result of the beam of the neighbouring cell.
[0127] Ofn is the measurement object specific offset of the reference signal of the neighbour cell.
[0128] Ocn is the cell specific offset of the neighbour cell.
[0129] Mbp is the measurement result of the SpCell.
[0130] Ofp is the measurement object specific offset of the SpCell (i.e. offsetMO as defined within measObjectNR corresponding to the SpCell) .
[0131] Ocp is the cell specific offset of the SpCell (i.e. cellIndividualOffset as defined within measObjectNR corresponding to the SpCell) , and is set to zero if not configured for the SpCell.
[0132] Hys is the hysteresis parameter for this event (i.e. hysteresis as defined within reportConfigNR for this event) .
[0133] Solution for E4 (Event#4: Beam (s) of a candidate cell becomes better than an absolute threshold) is as follows:
[0134] (1) Entering condition:
[0135] - Option E4-1a: A number m is configured by network. If m =1, it is fixed in the specification. Namely, the configuration from network is not needed.
[0136] - Alternative#1: UE considers the entering condition for this event to be fulfilled when condition E4-1 is fulfilled for the m beams.
[0137] - Alternative#2: UE considers the entering condition for this event to be fulfilled when condition E4-1 is fulfilled based on the average of the m beams.
[0138] The m beams could be the best m beams from the serving cell in this option.
[0139] (2) Leaving condition:
[0140] - Option E4-2a: A number m is configured by network. If m =1, it is fixed in the specification. Namely, the configuration from network is not needed.
[0141] - Alternative#1: UE considers the leaving condition for this event to be fulfilled when condition E4-2 is fulfilled for the best beam.
[0142] - Alternative#2: UE considers the leaving condition for this event to be fulfilled when condition E4-2 is fulfilled for the mth beam (based on the beam quality) .
[0143] - Alternative#3: UE considers the leaving condition for this event to be fulfilled when condition E4-2 is fulfilled for any one beam from the best m beams.
[0144] - Alternative#4: UE considers the leaving condition for this event to be fulfilled when condition E1-2 is fulfilled based on the average of the m beams.
[0145] The m beams could be the best m beams from the serving cell in this option.
[0146] - Option E4-2b: A number m and threshold for beam filtering are configured by network.
[0147] - UE considers the entering condition for this event to be fulfilled when condition E1-1 is fulfilled based on the average of the best minimum (m1, m) beams. There are m1 beams of the neighbour cell meeting the threshold. Mbs is the average of minimum (m1, m) beams of the neighbour cell.
[0148] Inequality E4-1 (Entering condition)
[0149] Mbn + Ofn + Ocn –Hys > Thresh
[0150] Inequality E4-2 (Leaving condition)
[0151] Mbn + Ofn + Ocn + Hys < Thresh
[0152] The variables in the formula are defined as follows:
[0153] Mbn is the measurement result of the neighbouring cell or the measurement result of serving PSCell (i.e., in case it is configured as candidate PSCell for CondEvent E4 evaluation) for CHO with candidate SCG (s) case.
[0154] Ofn is the measurement object specific offset of the neighbour cell (i.e. offsetMO as defined within measObjectNR corresponding to the neighbour cell) .
[0155] Ocn is the measurement object specific offset of the neighbour cell (i.e. cellIndividualOffset as defined within measObjectNR corresponding to the neighbour cell, or cellIndividualOffset as defined within reportConfigNR) , and set to zero if not configured for the neighbour cell.
[0156] Hys is the hysteresis parameter for this event.
[0157] Thresh is the threshold parameter for this event.
[0158] Solution for E5 (Event#5: Beam (s) of a serving cell becomes worse than an absolute threshold AND Beam (s) of a candidate cell becomes better than another absolute threshold) is as follows:
[0159] (1) Entering condition:
[0160] - Option E5-1a: A number m is configured by network. If m =1, it is fixed in the specification. Namely, the configuration from network is not needed.
[0161] - Alternative#1: UE considers the entering condition for this event to be fulfilled when condition E5-1 is fulfilled for the m beams from the serving cell and E5-2 is fulfilled for the m beams from the neighbour cell.
[0162] - Alternative#2: UE considers the entering condition for this event to be fulfilled when condition E5-1 is fulfilled based on the average of the m beams from the serving cell and condition E5-1 is fulfilled based on the average of the m beams from the neighbour cell.
[0163] The m beams could be the best m beams from the serving cell in this option.
[0164] (2) Leaving condition:
[0165] - Option E5-2a: A number m is configured by network. If m =1, it is fixed in the specification. Namely, the configuration from network is not needed.
[0166] - Alternative#1: UE considers the leaving condition for this event to be fulfilled when condition E5-3 is fulfilled for the best beam from the serving cell or condition E5-4 is fulfilled for the best beam from the neighbour cell.
[0167] - Alternative#2: UE considers the leaving condition for this event to be fulfilled when condition E5-3 is fulfilled for the mth beam from the serving cell or condition E5-4 is fulfilled for the mth beam from the neighbour cell.
[0168] - Alternative#3: UE considers the leaving condition for this event to be fulfilled when condition E5-3 is fulfilled for any one beam from the best m beams of the serving cell or condition E5-4 is fulfilled for any one beam from the best m beams of the neighbour cell.
[0169] - Alternative#4: UE considers the leaving condition for this event to be fulfilled when condition E5-3 is fulfilled based on the average of the m beams from the serving cell or condition E5-4 is fulfilled based on the average of the m beams from the neighbour cell.
[0170] The m beams could be the best m beams from the serving cell in this option.
[0171] - Option E5-2b: A number m and threshold for beam filtering are configured by network.
[0172] - UE considers the entering condition for this event to be fulfilled when condition E5-3 is fulfilled based on the average of the best minimum (m2, m) beams from serving cell or condition E5-4 is fulfilled based on the average of the best minimum (m1, m) beams from neighbour cell. There are m2 beams of the serving cell meeting the threshold. There are m1 beams of the neighbour cell meeting the threshold. Mbn is the average of minimum (m1, m) beams of the neighbour cell. Mbp is the average of minimum (m2, m) beams of the serving cell.
[0173] Inequality E5-1 (Entering condition 1)
[0174] Mbp + Hys < Thresh1
[0175] Inequality E5-2 (Entering condition 2)
[0176] Mbn + Ofn + Ocn –Hys > Thresh2
[0177] Inequality E5-3 (Leaving condition 1)
[0178] Mbp –Hys > Thresh1
[0179] Inequality E5-4 (Leaving condition 2)
[0180] Mbn + Ofn + Ocn + Hys < Thresh2
[0181] The variables in the formula are defined as follows:
[0182] Mbp is the measurement result of the beam from NR SpCell.
[0183] Mbn is the measurement result of the beam of the neighbouring cell.
[0184] Ofn is the measurement object specific offset of the neighbour cell (i.e. offsetMO as defined within measObjectNR corresponding to the neighbour cell) .
[0185] Ocn is the cell specific offset of the neighbour cell, and set to zero if not configured for the neighbour cell.
[0186] Hys is the hysteresis parameter for this event.
[0187] Thresh1 is the threshold parameter for this event.
[0188] Thresh2 is the threshold parameter for this event.
[0189] In some cases, an LTM configuration includes the beam configuration of both synchronization signal block (SSB) and channel state information reference signal (CSI-RS) in L1 measurement resource configuration. A MAC layer of a UE may handle an event evaluation and measurement report triggering. However, the following details have not been discussed yet, including, e.g., how a MAC layer of a UE handles the event evaluation, or how the MAC layer triggers an event based L1 measurement report. This patent application aims to address issues related to an event evaluation and a L1 measurement report in a MAC layer of a UE.
[0190] More details of the embodiments of the present application will be illustrated in the following text in combination with the appended drawings.
[0191] Figure 1 illustrates an example of a wireless communications system 100 in accordance with aspects of the present application. The wireless communications system 100 may include one or more NE 102, one or more UE 104, and a core network (CN) 106. The wireless communications system 100 may support various radio access technologies. In some implementations, the wireless communications system 100 may be a 4G network, such as an LTE network or an LTE-Advanced (LTE-A) network. In some other implementations, the wireless communications system 100 may be a NR network, such as a 5G network, a 5G-Advanced (5G-A) network, or a 5G ultrawideband (5G-UWB) network. In other implementations, the wireless communications system 100 may be a combination of a 4G network and a 5G network, or other suitable radio access technology including Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20. The wireless communications system 100 may support radio access technologies beyond 5G, for example, 6G. Additionally, the wireless communications system 100 may support technologies, such as time division multiple access (TDMA) , frequency division multiple access (FDMA) , or code division multiple access (CDMA) , etc.
[0192] The one or more NE 102 may be dispersed throughout a geographic region to form the wireless communications system 100. One or more of the NE 102 described herein may be or include or may be referred to as a network node, a base station, a network element, a network function, a network entity, a radio access network (RAN) , a NodeB, an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology. An NE 102 and a UE 104 may communicate via a communication link, which may be a wireless or wired connection. For example, an NE 102 and a UE 104 may perform wireless communication (e.g. receive signaling, transmit signaling) over a Uu interface.
[0193] An NE 102 may provide a geographic coverage area for which the NE 102 may support services for one or more UEs 104 within the geographic coverage area. For example, an NE 102 and a UE 104 may support wireless communication of signals related to services (e.g. voice, video, packet data, messaging, broadcast, etc. ) according to one or multiple radio access technologies. In some implementations, an NE 102 may be moveable, for example, a satellite associated with a non-terrestrial network (NTN) . In some implementations, different geographic coverage areas associated with the same or different radio access technologies may overlap, but the different geographic coverage areas may be associated with different NE 102.
[0194] The one or more UE 104 may be dispersed throughout a geographic region of the wireless communications system 100. A UE 104 may include or may be referred to as a remote unit, a mobile device, a wireless device, a remote device, a subscriber device, a transmitter device, a receiver device, or some other suitable terminology. In some implementations, the UE 104 may be referred to as a unit, a station, a terminal, or a client, among other examples. Additionally, or alternatively, the UE 104 may be referred to as an Internet-of-Things (IoT) device, an Internet-of-Everything (IoE) device, or machine-type communication (MTC) device, among other examples.
[0195] A UE 104 may be able to support wireless communication directly with other UEs 104 over a communication link. For example, a UE 104 may support wireless communication directly with another UE 104 over a device-to-device (D2D) communication link. In some implementations, such as vehicle-to-vehicle (V2V) deployments, vehicle-to-everything (V2X) deployments, or cellular-V2X deployments, the communication link may be referred to as a sidelink. For example, a UE 104 may support wireless communication directly with another UE 104 over a PC5 interface.
[0196] An NE 102 may support communications with the CN 106, or with another NE 102, or both. For example, an NE 102 may interface with other NE 102 or the CN 106 through one or more backhaul links (e.g. S1, N2, or network interface) . In some implementations, the NE 102 may communicate with each other directly. In some other implementations, the NE 102 may communicate with each other or indirectly (e.g. via the CN 106. In some implementations, one or more NE 102 may include subcomponents, such as an access network entity, which may be an example of an access node controller (ANC) . An ANC may communicate with the one or more UEs 104 through one or more other access network transmission entities, which may be referred to as a radio heads, smart radio heads, or transmission-reception points (TRPs) .
[0197] The CN 106 may support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions. The CN 106 may be an evolved packet core (EPC) , or a 5G core (5GC) , which may include a control plane entity that manages access and mobility (e.g. a mobility management entity (MME) , an access and mobility management functions (AMF) ) and a user plane entity that routes packets or interconnects to external networks (e.g. a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) . In some implementations, the control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management (e.g. data bearers, signal bearers, etc. ) for the one or more UEs 104 served by the one or more NE 102 associated with the CN 106.
[0198] The CN 106 may communicate with a packet data network over one or more backhaul links (e.g. via an S1, N2, or another network interface) . The packet data network may include an application server. In some implementations, one or more UEs 104 may communicate with the application server. A UE 104 may establish a session (e.g. a protocol data unit (PDU) session, or the like) with the CN 106 via an NE 102. The CN 106 may route traffic (e.g. control information, data, and the like) between the UE 104 and the application server using the established session (e.g. the established PDU session) . The PDU session may be an example of a logical connection between the UE 104 and the CN 106 (e.g. one or more network functions of the CN 106) .
[0199] In the wireless communications system 100, the NEs 102 and the UEs 104 may use resources of the wireless communications system 100 (e.g. time resources (e.g. symbols, slots, subframes, frames, or the like) or frequency resources (e.g. subcarriers, carriers) ) to perform various operations (e.g. wireless communications) . In some implementations, the NEs 102 and the UEs 104 may support different resource structures. For example, the NEs 102 and the UEs 104 may support different frame structures. In some implementations, such as in 4G, the NEs 102 and the UEs 104 may support a single frame structure. In some other implementations, such as in 5G and among other suitable radio access technologies, the NEs 102 and the UEs 104 may support various frame structures (i.e., multiple frame structures) . The NEs 102 and the UEs 104 may support various frame structures based on one or more numerologies.
[0200] One or more numerologies may be supported in the wireless communications system 100, and a numerology may include a subcarrier spacing and a cyclic prefix. A first numerology (e.g. μ=0) may be associated with a first subcarrier spacing (e.g. 15 kHz) and a normal cyclic prefix. In some implementations, the first numerology (e.g. μ=0) associated with the first subcarrier spacing (e.g. 15 kHz) may utilize one slot per subframe. A second numerology (e.g. μ=1) may be associated with a second subcarrier spacing (e.g. 30 kHz) and a normal cyclic prefix. A third numerology (e.g. μ=2) may be associated with a third subcarrier spacing (e.g. 60 kHz) and a normal cyclic prefix or an extended cyclic prefix. A fourth numerology (e.g. μ=3) may be associated with a fourth subcarrier spacing (e.g. 120 kHz) and a normal cyclic prefix. A fifth numerology (e.g. μ=4) may be associated with a fifth subcarrier spacing (e.g. 240 kHz) and a normal cyclic prefix.
[0201] A time interval of a resource (e.g. a communication resource) may be organized according to frames (also referred to as radio frames) . Each frame may have a duration, for example, a 10 millisecond (ms) duration. In some implementations, each frame may include multiple subframes. For example, each frame may include 10 subframes, and each subframe may have a duration, for example, a 1 ms duration. In some implementations, each frame may have the same duration. In some implementations, each subframe of a frame may have the same duration.
[0202] Additionally or alternatively, a time interval of a resource (e.g. a communication resource) may be organized according to slots. For example, a subframe may include a number (e.g. quantity) of slots. The number of slots in each subframe may also depend on the one or more numerologies supported in the wireless communications system 100. For instance, the first, second, third, fourth, and fifth numerologies (i.e., μ=0, μ=1, μ=2, μ=3, μ=4) associated with respective subcarrier spacings of 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz may utilize a single slot per subframe, two slots per subframe, four slots per subframe, eight slots per subframe, and 16 slots per subframe, respectively. Each slot may include a number (e.g. quantity) of symbols (e.g. OFDM symbols) . In some implementations, the number (e.g. quantity) of slots for a subframe may depend on a numerology. For a normal cyclic prefix, a slot may include 14 symbols. For an extended cyclic prefix (e.g. applicable for 60 kHz subcarrier spacing) , a slot may include 12 symbols. The relationship between the number of symbols per slot, the number of slots per subframe, and the number of slots per frame for a normal cyclic prefix and an extended cyclic prefix may depend on a numerology. It should be understood that reference to a first numerology (e.g. μ=0) associated with a first subcarrier spacing (e.g. 15 kHz) may be used interchangeably between subframes and slots.
[0203] In the wireless communications system 100, an electromagnetic (EM) spectrum may be split, based on frequency or wavelength, into various classes, frequency bands, frequency channels, etc. By way of example, the wireless communications system 100 may support one or multiple operating frequency bands, such as frequency range designations FR1 (410 MHz –7.125 GHz) , FR2 (24.25 GHz –52.6 GHz) , FR3 (7.125 GHz –24.25 GHz) , FR4 (52.6 GHz –114.25 GHz) , FR4a or FR4-1 (52.6 GHz –71 GHz) , and FR5 (114.25 GHz –300 GHz) . In some implementations, the NEs 102 and the UEs 104 may perform wireless communications over one or more of the operating frequency bands. In some implementations, FR1 may be used by the NEs 102 and the UEs 104, among other equipment or devices for cellular communications traffic (e.g. control information, data) . In some implementations, FR2 may be used by the NEs 102 and the UEs 104, among other equipment or devices for short-range, high data rate capabilities.
[0204] FR1 may be associated with one or multiple numerologies (e.g. at least three numerologies) . For example, FR1 may be associated with a first numerology (e.g. μ=0) , which includes 15 kHz subcarrier spacing; a second numerology (e.g. μ=1) , which includes 30 kHz subcarrier spacing; and a third numerology (e.g. μ=2) , which includes 60 kHz subcarrier spacing. FR2 may be associated with one or multiple numerologies (e.g. at least 2 numerologies) . For example, FR2 may be associated with a third numerology (e.g. μ=2) , which includes 60 kHz subcarrier spacing; and a fourth numerology (e.g. μ=3) , which includes 120 kHz subcarrier spacing.
[0205] Figure 2 illustrates an example of a UE 200 in accordance with aspects of the present application. The UE 200 may include a processor 202, a memory 204, a controller 206, and a transceiver 208. The processor 202, the memory 204, the controller 206, or the transceiver 208, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present application as described herein. These components may be coupled (e.g. operatively, communicatively, functionally, electronically, electrically) via one or more interfaces.
[0206] The processor 202, the memory 204, the controller 206, or the transceiver 208, or various combinations or components thereof may be implemented in hardware (e.g. circuitry) . The hardware may include a processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , or other programmable logic device, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present application.
[0207] The processor 202 may include an intelligent hardware device (e.g. a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination thereof) . In some implementations, the processor 202 may be configured to operate the memory 204. In some other implementations, the memory 204 may be integrated into the processor 202. The processor 202 may be configured to execute computer-readable instructions stored in the memory 204 to cause the UE 200 to perform various functions of the present application.
[0208] The memory 204 may include volatile or non-volatile memory. The memory 204 may store computer-readable, computer-executable code including instructions when executed by the processor 202 cause the UE 200 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such the memory 204 or another type of memory. Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer.
[0209] In some implementations, the processor 202 and the memory 204 coupled with the processor 202 may be configured to cause the UE 200 to perform one or more of the functions described herein (e.g. executing, by the processor 202, instructions stored in the memory 204) . For example, the processor 202 may support wireless communication at the UE 200 in accordance with examples as disclosed with respect to Figure 5. The UE 200 may be configured to support: a means for transmitting capability information indicating that the UE supports an event based L1 measurement report; a means for receiving a configuration related to a L1 measurement report, wherein the configuration includes information of at least one event; and a means for transmitting the L1 measurement report in response to fulfillment of the at least one event.
[0210] The controller 206 may manage input and output signals for the UE 200. The controller 206 may also manage peripherals not integrated into the UE 200. In some implementations, the controller 206 may utilize an operating system such as or other operating systems. In some implementations, the controller 206 may be implemented as part of the processor 202.
[0211] In some implementations, the UE 200 may include at least one transceiver 208. In some other implementations, the UE 200 may have more than one transceiver 208. The transceiver 208 may represent a wireless transceiver. The transceiver 208 may include one or more receiver chains 210, one or more transmitter chains 212, or a combination thereof. The means for receiving abovementioned in the processor 202 or the means for transmitting in the processor 202 may be implemented via at least one transceiver 208.
[0212] A receiver chain 210 may be configured to receive signals (e.g. control information, data, packets) over a wireless medium. For example, the receiver chain 210 may include one or more antennas for receive the signal over the air or wireless medium. The receiver chain 210 may include at least one amplifier (e.g. a low-noise amplifier (LNA) ) configured to amplify the received signal. The receiver chain 210 may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receiver chain 210 may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.
[0213] A transmitter chain 212 may be configured to generate and transmit signals (e.g. control information, data, packets) . The transmitter chain 212 may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM) , frequency modulation (FM) , or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM) . The transmitter chain 212 may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmitter chain 212 may also include one or more antennas for transmitting the amplified signal into the air or wireless medium.
[0214] Figure 3 illustrates an example of a processor 300 in accordance with aspects of the present application. The processor 300 may be an example of a processor configured to perform various operations in accordance with examples as described herein. The processor 300 may include a controller 302 configured to perform various operations in accordance with examples as described herein. The processor 300 may optionally include at least one memory 304, which may be, for example, an L1 / L2 / L3 cache. Additionally, or alternatively, the processor 300 may optionally include one or more arithmetic-logic units (ALUs) 306. One or more of these components may be in electronic communication or otherwise coupled (e.g. operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g. buses) .
[0215] The processor 300 may be a processor chipset and include a protocol stack (e.g. a software stack) executed by the processor chipset to perform various operations (e.g. receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) in accordance with examples as described herein. The processor chipset may include one or more cores, one or more caches (e.g. memory local to or included in the processor chipset (e.g. the processor 300) or other memory (e.g. random access memory (RAM) , read-only memory (ROM) , dynamic RAM (DRAM) , synchronous dynamic RAM (SDRAM) , static RAM (SRAM) , ferroelectric RAM (FeRAM) , magnetic RAM (MRAM) , resistive RAM (RRAM) , flash memory, phase change memory (PCM) , and others) .
[0216] The controller 302 may be configured to manage and coordinate various operations (e.g. signaling, receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) of the processor 300 to cause the processor 300 to support various operations in accordance with examples as described herein. For example, the controller 302 may operate as a control unit of the processor 300, generating control signals that manage the operation of various components of the processor 300. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.
[0217] The controller 302 may be configured to fetch (e.g. obtain, retrieve, receive) instructions from the memory 304 and determine subsequent instruction (s) to be executed to cause the processor 300 to support various operations in accordance with examples as described herein. The controller 302 may be configured to track memory address of instructions associated with the memory 304. The controller 302 may be configured to decode instructions to determine the operation to be performed and the operands involved. For example, the controller 302 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 300 to cause the processor 300 to support various operations in accordance with examples as described herein. Additionally, or alternatively, the controller 302 may be configured to manage flow of data within the processor 300. The controller 302 may be configured to control transfer of data between registers, arithmetic logic units (ALUs) , and other functional units of the processor 300.
[0218] The memory 304 may include one or more caches (e.g. memory local to or included in the processor 300 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementations, the memory 304 may reside within or on a processor chipset (e.g. local to the processor 300) . In some other implementations, the memory 304 may reside external to the processor chipset (e.g. remote to the processor 300) .
[0219] The memory 304 may store computer-readable, computer-executable code including instructions that, when executed by the processor 300, cause the processor 300 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. The controller 302 and / or the processor 300 may be configured to execute computer-readable instructions stored in the memory 304 to cause the processor 300 to perform various functions. For example, the processor 300 and / or the controller 302 may be coupled with or to the memory 304, the processor 300, the controller 302, and the memory 304 may be configured to perform various functions described herein. In some examples, the processor 300 may include multiple processors and the memory 304 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein.
[0220] The one or more ALUs 306 may be configured to support various operations in accordance with examples as described herein. In some implementations, the one or more ALUs 306 may reside within or on a processor chipset (e.g. the processor 300) . In some other implementations, the one or more ALUs 306 may reside external to the processor chipset (e.g. the processor 300) . One or more ALUs 306 may perform one or more computations such as addition, subtraction, multiplication, and division on data. For example, one or more ALUs 306 may receive input operands and an operation code, which determines an operation to be executed. One or more ALUs 306 be configured with a variety of logical and arithmetic circuits, including adders, subtractors, shifters, and logic gates, to process and manipulate the data according to the operation. Additionally, or alternatively, the one or more ALUs 306 may support logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 306 to handle conditional operations, comparisons, and bitwise operations.
[0221] The processor 300 may support wireless communication in accordance with examples as disclosed herein.
[0222] In some implementations, the processor 300 may be configured to support means for performing operations of a UE as described with respect to Figure 5. The processor 300 may be configured to or operable to support: a means for transmitting capability information indicating that the UE supports an event based L1 measurement report; a means for receiving a configuration related to a L1 measurement report, wherein the configuration includes information of at least one event; and a means for transmitting the L1 measurement report in response to fulfillment of the at least one event.
[0223] In some implementations, the processor 300 may be configured to support means for performing operations of a BS as described with respect to Figure 6. The processor 300 may be configured to or operable to support: a means for receiving, from a UE, capability information indicating that the UE supports an event based L1 measurement report; a means for transmitting, to the UE, a configuration related to a L1 measurement report, wherein the configuration includes information of at least one event; and a means for receiving, from the UE, the L1 measurement report in response to fulfillment of the at least one event.
[0224] It should be appreciated by persons skilled in the art that the components in exemplary processor 300 may be changed, for example, some of the components in exemplary processor 300 may be omitted or modified or new component (s) may be added to exemplary processor 300, without departing from the spirit and scope of the application. For example, in some embodiments, the processor 300 may not include the ALUs 306.
[0225] Figure 4 illustrates an example of a NE 400 in accordance with aspects of the present application. The NE 400 may include a processor 402, a memory 404, a controller 406, and a transceiver 408. The processor 402, the memory 404, the controller 406, or the transceiver 408, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present application as described herein. These components may be coupled (e.g. operatively, communicatively, functionally, electronically, electrically) via one or more interfaces.
[0226] The processor 402, the memory 404, the controller 406, or the transceiver 408, or various combinations or components thereof may be implemented in hardware (e.g. circuitry) . The hardware may include a processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , or other programmable logic device, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present application.
[0227] The processor 402 may include an intelligent hardware device (e.g. a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination thereof) . In some implementations, the processor 402 may be configured to operate the memory 404. In some other implementations, the memory 404 may be integrated into the processor 402. The processor 402 may be configured to execute computer-readable instructions stored in the memory 404 to cause the NE 400 to perform various functions of the present application.
[0228] The memory 404 may include volatile or non-volatile memory. The memory 404 may store computer-readable, computer-executable code including instructions when executed by the processor 402 cause the NE 400 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such the memory 404 or another type of memory. Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer.
[0229] In some implementations, the processor 402 and the memory 404 coupled with the processor 402 may be configured to cause the NE 400 to perform one or more of the functions described herein (e.g. executing, by the processor 402, instructions stored in the memory 404) . For example, the processor 402 may support wireless communication at the NE 400 in accordance with examples as disclosed herein. For example, the NE 400 may be configured to support means for performing the operations as described with respect to Figures 6-9 as described below.
[0230] In some implementations, the NE 400 may be a BS as described with respect to Figure 6. The NE 400 may be configured to support: a means for receiving, from a UE, capability information indicating that the UE supports an event based L1 measurement report; a means for transmitting, to the UE, a configuration related to a L1 measurement report, wherein the configuration includes information of at least one event; and a means for receiving, from the UE, the L1 measurement report in response to fulfillment of the at least one event.
[0231] The controller 406 may manage input and output signals for the NE 400. The controller 406 may also manage peripherals not integrated into the NE 400. In some implementations, the controller 406 may utilize an operating system such as or other operating systems. In some implementations, the controller 406 may be implemented as part of the processor 402.
[0232] In some implementations, the NE 400 may include at least one transceiver 408. In some other implementations, the NE 400 may have more than one transceiver 408. The transceiver 408 may represent a wireless transceiver. The transceiver 408 may include one or more receiver chains 410, one or more transmitter chains 412, or a combination thereof. The means for receiving or the means for transmitting abovementioned in the processor 402 may be implemented via at least one transceiver 408.
[0233] A receiver chain 410 may be configured to receive signals (e.g. control information, data, packets) over a wireless medium. For example, the receiver chain 410 may include one or more antennas for receive the signal over the air or wireless medium. The receiver chain 410 may include at least one amplifier (e.g. a low-noise amplifier (LNA) ) configured to amplify the received signal. The receiver chain 410 may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receiver chain 410 may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.
[0234] A transmitter chain 412 may be configured to generate and transmit signals (e.g. control information, data, packets) . The transmitter chain 412 may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM) , frequency modulation (FM) , or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM) . The transmitter chain 412 may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmitter chain 412 may also include one or more antennas for transmitting the amplified signal into the air or wireless medium.
[0235] It should be appreciated by persons skilled in the art that the components in exemplary NE 400 may be changed, for example, some of the components in exemplary NE 400 may be omitted or modified or new component (s) may be added to exemplary NE 400, without departing from the spirit and scope of the application. For example, in some embodiments, the NE 400 may not include the controller 406.
[0236] Figure 5 illustrates a flowchart of a method related to an event based L1 measurement report in accordance with aspects of the present application. The operations of the method may be implemented by a UE as described herein. In some implementations, the UE may execute a set of instructions to control the function elements of the UE to perform the described functions. In some implementations, aspects of operations 502, 504 and 506 may be performed by UE 200 as described with reference to Figure 2. Each of 502, 504 and 506 may be performed in accordance with examples as described herein. Specific examples are described in the embodiments of Figures 7 and 8 as follows.
[0237] At 502, the method may include transmitting, by a UE, capability information indicating that the UE supports an event based L1 measurement report.
[0238] At 504, the method may include receiving a configuration related to a L1 measurement report by the UE, for example from a BS (e.g. a MN) . The configuration includes information (denoted as information #1) of at least one event. In some implementations, information #1 includes at least one of the following:
[0239] (1) ID information of the at least one event, e.g. an event ID;
[0240] (2) one or more offsets for the at least one event, e.g. Ofn or Ocn;
[0241] (3) one or more hysteresis parameters for the at least one event, e.g. Hys;
[0242] (4) one or more thresholds for the at least one event, e.g. Thresh;
[0243] (5) one or more filter parameters for the at least one event; or
[0244] (6) time to trigger (TTT) associated with the at least one event.
[0245] In some implementations, the at least one event includes at least one of the following:
[0246] (1) a current beam of a serving cell of the UE becomes worse than a first threshold, e.g. Event#2;
[0247] (2) any beam of a candidate cell becomes an amount of offset better than the current beam of the serving cell, e.g. Event#3;
[0248] (3) any beam of the candidate cell becomes better than a second threshold, e.g. Event#4; or
[0249] (4) the current beam of the serving cell becomes worse than a third threshold AND any beam of the candidate cell becomes better than a fourth threshold, e.g. Event#5.
[0250] At 506, the method may include transmitting the L1 measurement report by the UE in response to fulfillment of the at least one event.
[0251] In some implementations of the method, a physical layer of the UE may evaluate whether an entering condition for the at least one event is fulfilled or not, and then deliver, to a MAC layer of the UE, first information which indicates that the entering condition for the at least one event is fulfilled or not fulfilled. For example, the first information includes ID information of the at least one event.
[0252] In some implementations, after the at least one event is considered as fulfilled, the physical layer of the UE is configured to evaluate whether a leaving condition for the at least one event is fulfilled or not, and then deliver, to the MAC layer of the UE, second information which indicates that the leaving condition for the at least one event is fulfilled or not fulfilled. For example, the second information includes ID information of the at least one event.
[0253] In some implementations of the method, the MAC layer of the UE may determine whether all the first information received from the physical layer of the UE during a time window (e.g. TTT) indicates that an entering condition for the at least one event is fulfilled. If all the first information received during the time window indicates that the entering condition for the at least one event is fulfilled, the MAC layer of the UE may determine that the at least one event is fulfilled, and trigger a first L1 measurement report for the at least one event.
[0254] In some embodiments, the time window is configured separately for each event within the at least one event. For example, TTT configured to a first event is different and separate from TTT configured to a second event. If all the first information received during TTT configured to the first event indicates that the entering condition for the first event is fulfilled, the MAC layer of the UE may determine that the first event is fulfilled, and trigger a first L1 measurement report for the first event. If all the first information received during TTT configured to the second event indicates that the entering condition for the second event is fulfilled, the MAC layer of the UE may determine that the second event is fulfilled, and trigger a first L1 measurement report for the second event.
[0255] In some implementations of the method, the MAC layer of the UE may determine whether all the second information received from the physical layer during a time window (that is configured for the at least one event, e.g. TTT) indicates that a leaving condition for the at least one event is fulfilled. If all the second information indicates that the leaving condition for the at least one event is fulfilled, the MAC layer of the UE may trigger a second L1 measurement report for the at least one event. For example, if all the second information received during the TTT configured to the first event indicates that the leaving condition for the first event is fulfilled, the MAC layer of the UE may trigger a second L1 measurement report for the first event.
[0256] In some implementations, the L1 measurement report for the at least one event is transmitted via a MAC CE. For example, the MAC CE includes at least one of the following:
[0257] (1) Quality of a current beam of a serving cell of the UE.
[0258] (2) Quality of one beam that is involved in the at least one event, wherein the at least one event is triggered. For example, for Event#3 (Beam (s) of a candidate cell becomes offset better than beam (s) of a serving cell) , if beam #1 is used in the evaluation of event LTM, quality of beam #1, a beam index of beam #1 and the corresponding cell ID of beam #1 should be included in the MAC CE.
[0259] (3) Quality of one or more best beams (e.g. k beams) of one neighbor cell, wherein any beam from the one neighbor cell is involved in the at least one event (that is triggered) , and a maximum number of the one or more best beams for the one neighbour cell can be configured by the network. For example, for Event#3, if beam #1 from neighbor cell #1 is used in the evaluation of Event#3, quality of best k beams of neighbor cell #1 shoud be included in the MAC CE.
[0260] (4) Only quality of one or more best beams (e.g. k beams) of one or more neighbour cells (e.g. n neighbour cells) that is greater than a threshold configured by a network, wherein a maximum number of the one or more neighbour cells can be configured by the network, and a maximum number of the one or more best beams (e.g. k) for each neighbour cell within the one or more neighbour cells can be configured by the network.
[0261] (5) An indication to indicate that the L1 measurement report is triggered by fulfillment of an entering condition or a leaving condition for the at least one event. For example, if the same MAC CE is used for both a measurement report of when "the event is fulfilled" and a measurement report of when "a leaving condition of the event is fulfilled (the event is not fulfilled) " , a flag should be included in the MAC CE. Namely, the flag is used to indicate whether this MAC CE is reported due to "the event is fulfilled" or "the event is not fulfilled. "
[0262] In some implementations, the MAC CE carrying the L1 measurement report for the at least one event may include:
[0263] (1) two or more L1 measurement reports triggered by two or more events within the at least one event; and
[0264] (2) ID information of each of the two or more events.
[0265] In some implementations of the method, a MAC PDU can contain at most one MAC CE which includes the L1 measurement report for the at least one event. In some embodiments, when the MAC PDU including the one MAC CE (which includes the L1 measurement report for the at least one event) is transmitted, the UE may cancel one or more MAC CEs (which include the L1 measurement report for the at least one event) that are triggered prior to assembling the MAC PDU.
[0266] In some other implementations of the method, the MAC layer of the UE may assemble a MAC PDU to contain at most one MAC CE which includes the L1 measurement report per event within in the at least one event. This MAC CE includes different contents for each event within the at least one event. For example, if the at least one event includes a second event, a third event, and a fourth event, the MAC layer of the UE may assemble the MAC PDU to contain one MAC CE including contents for the second event, one MAC CE including contents for the third event, and one MAC CE including contents for the fourth event, while contents in these three MAC CEs are different.
[0267] In some implementations of the method, the MAC layer of the UE may assemble a MAC PDU to contain a first MAC CE including the L1 measurement report for a first event within the at least one event. After assembling the MAC PDU but before transmitting the MAC PDU, the UE may trigger a second MAC CE including the L1 measurement report for the first event. That is, before assembling the MAC PDU to contain the first MAC CE (which includes the L1 measurement report for the first event) , the MAC layer of the UE is not allow to trigger the second MAC CE (which includes the L1 measurement report for the first event) .
[0268] In some embodiments, when transmitting the MAC PDU containing the first MAC CE (which includes the L1 measurement report for the first event) , the MAC layer of the UE may cancel one or more MAC CEs (which include the L1 measurement report for the first event) that are triggered prior to assembling the MAC PDU.
[0269] In some implementations of the method, if a MAC PDU cannot accommodate one MAC CE including the L1 measurement report for the at least one event, the MAC PDU includes a truncated MAC CE including the L1 measurement report. In some embodiments, the truncated MAC CE includes only one beam for each neighbor cell of the UE. For example, if different priorities for different events are defined, the contents triggered by the event with a lower priority can be removed.
[0270] In an embodiment, if the at least one event includes a first event, a second event and a third event configured with different priorities, and if the second event and the third event have lower priorities compared with the priority of the first event, the MAC layer of the UE may generate the truncated MAC CE by removing contents triggered by the second event and / or the third event with lower priorities from the one MAC CE (which includes the L1 measurement report for all of the first event, the second event and the third event) . Then, the MAC layer of the UE may assemble the MAC PDU to contain the truncated MAC CE.
[0271] In some implementations of the method, the UE may apply a LCP procedure when a transmission is performed by the UE. For example, a MAC CE for (extended) BSR has a priority higher than a MAC CE including the L1 measurement report for the at least one event. The MAC CE including the L1 measurement report has a priority higher than a MAC CE for a positioning measurement gap activation or deactivation request.
[0272] In some cases, the MAC CE including the L1 measurement report has the same priority as following one or more MAC CEs: a MAC CE for (enhanced) single entry power headroom report (PHR) , or a MAC CE for (enhanced) multiple entry PHR or a MAC CE for single entry PHR with assumed physical uplink share channel (PUSCH) , or a MAC CE for multiple entry PHR with assumed PUSCH, or a MAC CE for enhanced single entry PHR for multiple transmission reception point (TRP) or a MAC CE for enhanced multiple entry PHR for multiple TRP, or a MAC CE for enhanced single entry PHR for multiple TRP STx2P or a MAC CE for enhanced multiple entry PHR for multiple TRP STx2P.
[0273] In some implementations of the method, the UE may determine that at least one L1 measurement report has been triggered and not cancelled. If one or more uplink (UL) resources are available for a transmission and the one or more UL resources can accommodate a MAC CE and a sub-header of the MAC CE and the at least one L1 measurement report, the UE may instruct a multiplexing and assembly procedure to generate the MAC CE. If the one or more UL resources are not available or if the one or more UL resources cannot accommodate the MAC CE and the sub-header of the MAC CE, the UE may trigger a scheduling request (SR) transmission. For example, the SR transmission is triggered if the SR transmission is configured with a value "enabled. "
[0274] It should be noted that the method described in Figure 5 describes possible implementations, and that the operations and the steps may be rearranged or otherwise eliminated or modified and that other implementations are possible, without departing from the spirit and scope of the application.
[0275] Figure 6 illustrates a flowchart of a method related to an event based L1 measurement report in accordance with aspects of the present application. The operations of the method may be implemented by a network node as described herein. In some implementations, the network node may be a BS, and may execute a set of instructions to control the function elements of the BS to perform the described functions. In some implementations, aspects of operations 602, 604 and 606 may be performed by NE 400 as described with reference to Figure 4. Each of 602, 604 and 606 may be performed in accordance with examples as described herein. Specific examples are described in the embodiments of Figures 7 and 8 as follows.
[0276] At 602, the method may include receiving, by a BS from a UE, capability information indicating that the UE supports an event based L1 measurement report.
[0277] At 604, the method may include transmitting, by the BS to the UE, a configuration related to a L1 measurement report, which includes information (e.g. information #1 as described in the embodiments of Figure 5) of at least one event. The information transmitted at 604 may include the same or similar elements as those in information #1 received at 504 in Figure 5. In some implementations, the at least one event may include the same or similar elements as those in the at least one event as described in the embodiments of Figure 5, e.g. Event#2, Event#3, Event#4 and / or Event#5.
[0278] At 606, the method may include receiving, by the BS from the UE, the L1 measurement report in response to fulfillment of the at least one event.
[0279] In some implementations of the method, the L1 measurement report is transmitted via a MAC CE. The MAC CE includes at least one of the following:
[0280] (1) quality of one beam that is involved in the at least one event, wherein the at least one event is triggered;
[0281] (2) quality of one or more best beams (e.g. k beams) of one neighbor cell, wherein any beam from the one neighbor cell is involved in the at least one event that is triggered, and a maximum number of the one or more best beams for the one neighbour cell can be configured by the network;
[0282] (3) only quality of one or more best beams (e.g. k beams) of one or more neighbour cells (e.g. n neighbour cells) that is greater than a threshold configured by a network, wherein a maximum number of the one or more neighbour cells can be configured by the network, and a maximum number of the one or more best beams for each neighbour cell within the one or more neighbour cells can be configured by the network; or
[0283] (4) an indication to indicate that the L1 measurement report is triggered by fulfillment of an entering condition or a leaving condition for the at least one event.
[0284] In some implementations, the MAC CE includes both of: (1) two or more L1 measurement reports triggered by two or more events within the at least one event; and (2) ID information of each of the two or more events.
[0285] In some implementations, a MAC PDU can contain at most one MAC CE including the L1 measurement report.
[0286] In some embodiment, if a MAC PDU cannot accommodate one MAC CE including the L1 measurement report, the MAC PDU includes a truncated MAC CE including the L1 measurement report for the at least one event. For example, the truncated MAC CE includes only one beam for each neighbor cell of the UE.
[0287] In some implementations of the method, a MAC CE for a BSR or an extended BSR has a priority higher than a MAC CE including the L1 measurement report. The MAC CE including the L1 measurement report has a priority higher than a MAC CE for a positioning measurement gap activation or deactivation request.
[0288] In some implementations of the method, if one or more UL resources are available for a transmission and the one or more UL resources can accommodate a MAC CE and a sub-header of the MAC CE and the at least one L1 measurement report, the BS may receive, from the UE, the MAC CE including the at least one L1 measurement report for the at least one event. If the one or more UL resources are not available or if the one or more UL resources cannot accommodate the MAC CE and the sub-header of the MAC CE, the BS may receive a SR transmission from the UE. For example, the SR transmission is triggered if the SR transmission is configured with a value "enabled. "
[0289] It should be noted that the method described in Figure 6 describes possible implementations, and that the operations and the steps may be rearranged or otherwise eliminated or modified and that other implementations are possible, without departing from the spirit and scope of the application.
[0290] Figure 7 illustrates a schematic diagram of transmitting an event based L1 measurement report in accordance with aspects of the present application. Details described in all other embodiments of the present application are applicable for the embodiments shown in Figure 7.
[0291] In 701, a UE accesses a network node via MCG only or Dual-connectivity (DC) including MCG and SCG. Namely, the UE accesses a MN and a SN (which are included in the network node shown in Figure 7) via DC.
[0292] In some embodiments of 701, the UE may report the UE capability to the MN if receiving the enquiry from the MN. For example, the UE may report:
[0293] (1) information to indicate whether the UE supports event based L1 measurement report;
[0294] (2) information to indicate which event the UE supports for L1 measurement report. In an embodiment, the event includes at least one of the following:
[0295] - Event #A for LTM: Beam (s) of a serving cell becomes worse than an absolute threshold, e.g. Event#2;
[0296] - Event #B for LTM: Beam (s) of a candidate cell becomes amount of offset better than beam of serving cell, e.g. Event#3;
[0297] - Event #C for LTM: Beam (s) of a candidate cell becomes better than an absolute threshold, e.g. Event#4;
[0298] - Event #D for LTM: Beam (s) of a serving cell becomes worse than absolute threshold AND Beam (s) of a candidate cell becomes better than another absolute threshold, e.g. Event#5.
[0299] (3) information to indicate whether to support an event based L1 measurement report based on CSI-RS; and / or
[0300] (4) information to indicate whether to support an event based L1 measurement report based on SSB.
[0301] In some embodiments of 701, the UE may receive a configuration related to L1 measurement report from the MN. If DC is configured, the UE may receive the configuration related to L1 measurement report from both the MN and the SN. The configuration from the SN is configured for SCG LTM purpose.
[0302] In 702, the network node (e.g. the MN) transmits an RRC reconfiguration message including at least the L1 measurement report. For example, the RRC reconfiguration message includes at least one of the following:
[0303] (1) An indication to indicate which event is used for triggering measurement report.
[0304] (2) An indication to indicate whether a L1 measurement report can be triggered or not once a leaving condition is met.
[0305] (3) An indication to indicate whether L1 measurement report is periodic once a L1 measurement report is triggered.
[0306] (4) An indication to indicate the number of L1 measurement report if multiple L1 measurement reports are supported.
[0307] In 703, the UE starts to evaluate the event according to the configuration received in 702. Different operations may be performed in different embodiments, i.e. Option 1, Option 2 and Option 3.
[0308] (1) Option 1:
[0309] - An event is specified in L1. A physical layer of the UE checks whether the entering condition (or the entering equation) for the event is fulfilled or not, e.g. for each time occasion (millisecond) . The physical layer of the UE will deliver the first information indicating "fulfilled" or "not fulfilled" for an event (or the first information indicating "the entering condition is met or not" ) to a MAC layer of the UE. The MAC layer maintains a time window (e.g. TTT configured for the event) . The MAC layer decides whether the event is fulfilled or not during the time window. For example, if all the first information received from the physical layer during the time window indicates that the event is "fulfilled" , the UE determines that the event is fulfilled. A L1 measurement report will be triggered.
[0310] - After the event is considered as fulfilled, the physical layer of the UE checks a leaving condition (or a leaving equation) for the event is fulfilled or not. The physical layer will deliver the second information indicating "not fulfilled" for the event or the second information indicating "leaving condition is fulfilled for an event" to the MAC layer. If all the second information received from the physical layer during the time window indicates "not fulfilled" or "the leaving condition of the event is fulfilled" , the UE determines that the event is not fulfilled. Namely, the leaving condition is met during time window. The measurement report MAC CE may be triggered. In an embodiment, once the MAC layer receives the second information from the physical layer during the time window which indicates "not fulfilled" or "the leaving condition of the event is fulfilled" , the UE determines that the event is not fulfilled.
[0311] (2) Option 2:
[0312] - An event is specified in L1. A maximum number of a counter may be configured by the network node. The initial value of a first counter set to 0. If a MAC layer of the UE receives a first indication of "fulfilled" for an event, the first counter for this event is incremented by 1 and the first timer is restarted. If the MAC layer of the UE does not receive the first indication of "fulfilled" , the first timer will expire. Once the first timer expires, the MAC layer of the UE sets the first counter to 0. If the MAC layer of the UE receives the indication of "not fulfilled" , the first counter is set to 0. When the first counter is equal to the configured maximum number, the UE considers that the event is met, and the first counter is set to 0.
[0313] - After the event is considered as met, a second counter is incremented by 1 and the second timer is restarted if the MAC layer of the UE receives a second indication of e.g. "leaving condition of the event is fulfilled" from the physical layer of the UE. If the second counter is equal to the configured maximum number, the UE considers that the leaving condition is met. Then, the measurement report MAC CE is triggered due to "the leaving condition of the event is fulfilled" .
[0314] (3) Option 3:
[0315] - An event is specified in L1. A Physical layer of the UE maintains a time window e.g. TTT configured for the event) . The physical layer decides whether the entering condition (or the entering equation) for the event is fulfilled or not during the time window. For example, if the event is "fulfilled" during time window, the physical layer of the UE will deliver first information which indicates "fulfilled" to a MAC layer of the UE. Then, the MAC layer determines that the event is fulfilled. A L1 measurement report will be triggered.
[0316] - After the event is considered as fulfilled, the physical layer of the UE will determine whether a leaving condition (or a leaving equation) for the event is fulfilled during the time window. Then, the physical layer of the UE delivers it to the MAC layer. If the MAC layer of UE determines that the leaving condition of the event is met, the measurement report MAC CE is triggered as well.
[0317] In 704, the UE is triggered to report a L1 measurement results and transmit a MAC CE including the L1 measurement report to the network node. For example, the MAC CE includes the following one or more elements:
[0318] (1) Quality of a current beam of a serving cell of the UE.
[0319] (2) Quality of the beam which is involved in the triggered event. For example, for Event#3 (Beam of candidate cell becomes amount of offset better than beam of serving cell) , if beam#1 is used in the evaluation of event LTM, the quality of beam#1 should be included in the MAC CE. Beam index and corresponding cell ID of beam#1 should also be included in the MAC CE.
[0320] (3) Quality of best k beam (s) of one neighbor cell which is involved in the triggered event. For example, for Event#3, if beam#1 from neighbor cell#1 is used in the evaluation of event LTM, best k beam of neighbor cell#1 should be included in the MAC CE.
[0321] (4) Quality of best (k) beam (s) of (n) neighbor cells. The maximum of neighbour cells can be configured by the network node. The maximum number of best beam (e.g. k) can be configured by the network node. Only the quality of beams greater than a threshold configured by the network node can be included in the MAC CE.
[0322] In some embodiments, if the same MAC CE is used for "the measurement report when the event is fulfilled" and "the measurement report when the leaving condition of the event fulfilled" , a flag may be included in the MAC CE. Namely, the flag is used to indicate whether this MAC CE is reported due to "the event is fulfilled" or "the leaving condition of the event fulfilled" .
[0323] In some embodiments, the contents of the L1 measurement report are different for different triggered events, but all the contents due to all triggered events can be included in a single MAC CE. The event ID for each event associated with the L1 measurement report should be added in the MAC CE.
[0324] In some embodiments, if a MAC PDU cannot accommodate one MAC CE including the L1 measurement report, a truncated MAC CE can be added into the MAC PDU. For example, only one beam for each neighbour cell can be included in the truncated MAC CE in the MAC PDU. Such embodiments can be applied to all cases including:
[0325] (1) Case 1: the same content of a L1 measurement report for any triggered event is included in the MAC CE.
[0326] (2) Case 2: the contents of the L1 measurement report in the MAC CE is different for different triggered events; and
[0327] (3) Case 3: the contents of the L1 measurement report are different for different triggered events, but all the contents due to all triggered events are included in a single MAC CE.
[0328] In some embodiments of Case 3, if different priorities for different events are defined, the contents triggered by one or more events with lower priorities can be removed from the single MAC CE to form the truncated MAC CE in the MAC PDU.
[0329] In some embodiments, the LCP procedure is applied whenever a new transmission is performed by the UE. A MAC CE for (extended) BSR has a higher priority than a MAC CE including the L1 measurement report. The MAC CE including the L1 measurement report has a higher priority than a MAC CE for Positioning Measurement Gap Activation / Deactivation Request. For example, logical channels shall be prioritized in accordance with the following order:
[0330] (1) a MAC CE for (Extended) BSR, with exception of BSR included for padding;
[0331] (2) a MAC CE for (Enhanced) Single Entry PHR, or MAC CE for (Enhanced) Multiple Entry PHR or MAC CE for Single Entry PHR with assumed PUSCH, or MAC CE for Multiple Entry PHR with assumed PUSCH, or MAC CE for Enhanced Single Entry PHR for multiple TRP or MAC CE for Enhanced Multiple Entry PHR for multiple TRP, or MAC CE for Enhanced Single Entry PHR for multiple TRP STx2P or MAC CE for Enhanced Multiple Entry PHR for multiple TRP STx2P or L1 measurement report MAC CE;
[0332] (3) a MAC CE for Positioning Measurement Gap Activation / Deactivation Request;
[0333] In 705, after the network node receives the L1 measurement report, the network node will decide whether to trigger cell switch e.g. an LTM cell switch.
[0334] Figure 8 illustrates a schematic diagram of transmitting an event based L1 measurement report in accordance with aspects of the present application. Details described in all other embodiments of the present application are applicable for the embodiments shown in Figure 8.
[0335] Following text describes different embodiments of Figure 8 in different cases, i.e. Embodiment 1 and Embodiment 2.
[0336] Embodiment 1
[0337] In 801, a UE accesses a network node via MCG only or DC including MCG and SCG. Namely, the UE accesses a MN and a SN via DC.
[0338] In some embodiments of 801, the UE may report the UE capability to the MN if receiving the enquiry from the MN. For example, the UE may report:
[0339] (1) information to indicate whether the UE supports an event based L1 measurement report;
[0340] (2) information to indicate which event the UE supports for L1 measurement report. In an embodiment, the event includes at least one of: Event #A for LTM, Event #B for LTM, Event #C for LTM, or Event #D for LTM as described in the embodiments of Figure 7.
[0341] (3) information to indicate whether to support an event based L1 measurement report based on CSI-RS; and / or
[0342] (4) information to indicate whether to support an event based L1 measurement report based on SSB.
[0343] In some embodiments of 801, the UE may receive a configuration related to L1 measurement report from the MN. If DC is configured, the UE may receive the configuration related to L1 measurement report from both the MN and the SN. The configuration from the SN is configured for SCG LTM purpose.
[0344] In 802, the network node (e.g. the MN) transmits an RRC reconfiguration message including at least the L1 measurement report. For example, the RRC reconfiguration message includes at least one of the following:
[0345] (1) An indication to indicate which event is used for triggering measurement report.
[0346] (2) An indication to indicate whether a L1 measurement report can be triggered or not once a leaving condition is met.
[0347] (3) An indication to indicate whether L1 measurement report is periodic once a L1 measurement report is triggered.
[0348] (4) An indication to indicate the number of L1 measurement report if multiple L1 measurement reports are supported.
[0349] In 803, the UE starts to evaluate the event according to the configuration received in 802. In 803, different operations may be performed in different embodiments, i.e. Option 1, Option 2 and Option 3 as described in the embodiments of Figure 7.
[0350] In 804, the UE is triggered to report L1 measurement results based on the event. In some embodiments, after a L1 measurement reporting procedure to determine that at least one measurement report has been triggered and not cancelled, if a UL resource (e.g. UL-SCH resources) is available for a transmission (or a new transmission) and the UL resource can accommodate the MAC CE including the L1 measurement report plus a sub-header of the MAC CE, the UE instructs the multiplexing and assembly procedure to generate the MAC CE including the L1 measurement report. Else, if the UL resource (e.g. UL-SCH resources) is available for the transmission (or the new transmission) and the UL resource cannot accommodate the MAC CE (which includes the L1 measurement report) plus its sub-header, the UE may trigger a SR (if the SR related to the L1 measurement report is configured with a value enabled) .
[0351] In 806, the UE can transmit the MAC CE including the L1 measurement report based on the UL grant. In some embodiments, if the network node receives the SR, the network node will allocate a UL grant to the UE in 805 (optional) . Then, in 806, the UE can transmit the MAC CE (which includes the L1 measurement report) based on the UL grant in 806. The MAC CE transmitted in 806 may include the same or similar elements as those in MAC CE transmitted in 704 in the embodiments of Figure 7.
[0352] In 807, after the network node receives the L1 measurement report, the network node will decide whether to trigger cell switch, e.g. an LTM cell switch.
[0353] Embodiment 2
[0354] Operation 801 in Embodiment 2 is the same as operation 801 in Embodiment 1.
[0355] Operation 802 in Embodiment 2 is the same as operation 802 in Embodiment 1.
[0356] Operation 803 in Embodiment 2 is the same as operation 803 in Embodiment 1.
[0357] In 804, the UE is triggered to report L1 measurement results based on the event. In some embodiments, there may be different cases in different embodiments, i.e. Case 1, Case 2, and Case 3 as below.
[0358] Case 1: the same content of a L1 measurement report for any triggered event is included in the MAC CE.
[0359] In some embodiments of Case 1, multiple events may be configured to the UE. Once the first event is met, a MAC CE including a first L1measurement report will be triggered. It is possible that a MAC CE including a second L1 measurement report may be triggered due to that another event is met.
[0360] In some embodiments of Case 1, a MAC PDU shall contain at most one MAC CE including a L1 measurement report, even when multiple events have triggered multiple MAC CEs including the L1 measurement reports.
[0361] In some embodiments of Case 1, if the MAC PDU includes one MAC CE, all MAC CEs including the L1 measurement reports triggered prior to assembling a MAC PDU shall be cancelled when the MAC PDU is transmitted.
[0362] Case 2: the contents of the L1 measurement report in the MAC CE is different for different triggered events; and
[0363] In some embodiments of Case 2, after a MAC CE including a first L1 measurement report is triggered (but pending or not transmitted) , the UE continues evaluating the one or more events. Once the leaving condition of the same event is met, a MAC CE including a second measurement report for the same event will be triggered upon this leaving condition is met.
[0364] In some embodiments of Case 2, a MAC PDU shall contain at most one MAC CE including a L1 measurement report per event. Regarding different events, a MAC PDU can contain at most one MAC CE a L1 measurement report for each event.
[0365] In some embodiments of Case 2, a MAC PDU assembly can happen at any point in time between an uplink grant reception and an actual transmission of the corresponding MAC PDU. A MAC CE including a second L1 measurement report for the same event can be triggered after the assembling the MAC PDU (which contains MAC CE that includes a first L1 measurement report) but before the transmission of this MAC PDU.
[0366] In some embodiments of Case 2, all MAC CEs including L1 measurement reports for an event triggered prior to assembling a MAC PDU shall be cancelled when the MAC PDU is transmitted and this MAC PDU includes the MAC CE including the L1 measurement reports for the same event.
[0367] Case 3: the contents of the L1 measurement report are different for different triggered events, but all the contents due to all triggered events are included in a single MAC CE.
[0368] In some embodiments of Case 3, after a L1 measurement reporting procedure to determine that at least one measurement report has been triggered and not cancelled, if a UL resource (e.g. UL-SCH resources) is available for a transmission (or a new transmission) and the UL resource can accommodate the MAC CE including the L1 measurement report plus a sub-header of the MAC CE, the UE instructs the multiplexing and assembly procedure to generate the MAC CE including the L1 measurement report. Else, if the UL resource (e.g. UL-SCH resources) is available for the transmission (or the new transmission) and the UL resource cannot accommodate the MAC CE (which includes the L1 measurement report) plus its sub-header, the UE may trigger a SR (if the SR related to the L1 measurement report is configured with a value enabled) .
[0369] Operation 805 in Embodiment 2 is the same as operation 805 in Embodiment 1.
[0370] Operation 806 in Embodiment 2 is the same as operation 806 in Embodiment 1.
[0371] Operation 807 in Embodiment 2 is the same as operation 807 in Embodiment 1.
[0372] The description herein is provided to enable a person having ordinary skill in the art to make or use the application. Various modifications to the application will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the application. Thus, the application is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.
Claims
1.A user equipment (UE) , comprising:at least one memory; andat least one processor coupled to the at least one memory and configured to cause the UE to:transmit capability information indicating that the UE supports an event based layer-1 (L1) measurement report;receive a first configuration related to a L1 measurement report, wherein the first configuration includes information of at least one event; andtransmit the L1 measurement report in response to fulfillment of the at least one event.2.The UE of claim 1, wherein the information of the at least one event includes at least one of the following:identifier (ID) information of the at least one event;one or more offsets for the at least one event;one or more hysteresis parameters for the at least one event;one or more thresholds for the at least one event;one or more filter parameters for the at least one event; ortime to trigger (TTT) associated with the at least one event.3.The UE of claim 1, wherein the at least one event includes at least one of the following:a current beam of a serving cell of the UE becomes worse than a first threshold;any beam of a candidate cell becomes an amount of offset better than the current beam of the serving cell;any beam of the candidate cell becomes better than a second threshold; orthe current beam of the serving cell becomes worse than a third threshold and any beam of the candidate cell becomes better than a fourth threshold.4.The UE of claim 1, wherein a physical layer of the UE is configured to:evaluate whether an entering condition for the at least one event is fulfilled or not; anddeliver first information to a medium access control (MAC) layer of the UE, wherein the first information indicates that the entering condition for the at least one event is fulfilled or not fulfilled.5.The UE of claim 1, wherein after the at least one event is considered as fulfilled, a physical layer of the UE is configured to:evaluate whether a leaving condition for the at least one event is fulfilled or not; anddeliver second information to a medium access control (MAC) layer of the UE, wherein the second information indicates that the leaving condition for the at least one event is fulfilled or not fulfilled.6.The UE of claim 4 or claim 5, wherein at least one of the first information or the second information includes identifier (ID) information of the at least one event.7.The UE of claim 4, wherein the MAC layer of the UE is configured to:determine whether all the first information received from the physical layer of the UE during a time window configured for the at least one event indicates that an entering condition for the at least one event is fulfilled; andif all the first information indicates that the entering condition for the at least one event is fulfilled, determine that the at least one event is fulfilled, and trigger a first L1 measurement report.8.The UE of claim 5, wherein the MAC layer of the UE is configured to:determine whether all the second information received from the physical layer during a time window configured for the at least one event indicates that a leaving condition for the at least one event is fulfilled; andif all the second information indicates that the leaving condition for the at least one event is fulfilled, trigger a second L1 measurement report.9.The UE of claim 1, wherein:the L1 measurement report is transmitted via a medium access control (MAC) control elements (CE) ; andthe MAC CE includes at least one of the following:quality of a current beam of a serving cell of the UE;quality of one beam that is involved in the at least one event, wherein the at least one event is triggered;quality of one or more best beams of one neighbor cell, wherein any beam from the one neighbor cell is involved in the at least one event that is triggered, and a maximum number of the one or more best beams for the one neighbour cell can be configured by the network;only quality of one or more best beams of one or more neighbour cells that is greater than a threshold configured by a network, wherein a maximum number of the one or more neighbour cells can be configured by the network, and a maximum number of the one or more best beams for each neighbour cell within the one or more neighbour cells can be configured by the network; oran indication to indicate that the L1 measurement report is triggered by fulfillment of an entering condition or a leaving condition for the at least one event.10.The UE of claim 9, wherein the MAC CE includes:two or more L1 measurement reports triggered by two or more events within the at least one event; andidentifier (ID) information of each of the two or more events.11.The UE of claim 1, wherein a MAC protocol data unit (PDU) can contain at most one MAC CE including the L1 measurement report.12.The UE of claim 11, wherein the at least one processor is configured to cause the UE to cancel one or more MAC CEs including the L1 measurement report for the at least one event that are triggered prior to assembling the MAC PDU, when the MAC PDU including the one MAC CE is transmitted.13.The UE of claim 1, wherein a medium access control (MAC) layer of the UE is configured to perform at least one of the following:assembling a MAC protocol data unit (PDU) to contain at most one MAC CE including the L1 measurement report per event within in the at least one event, wherein the one MAC CE includes different contents for each event within the at least one event; orassembling the MAC PDU to contain a first MAC CE including the L1 measurement report for a first event within the at least one event; and trigger a second MAC CE including the L1 measurement report for the first event after assembling the MAC PDU but before transmitting the MAC PDU; orwhen transmitting the MAC PDU containing the first MAC CE including the L1 measurement report for the first event, cancelling one or more MAC CEs including the L1 measurement report for the first event that are triggered prior to assembling the MAC PDU.14.The UE of claim 1, wherein if a MAC protocol data unit (PDU) cannot accommodate one MAC CE including the L1 measurement report, the MAC PDU includes a truncated MAC CE including the L1 measurement report for the at least one event.15.The UE of claim 14, wherein the truncated MAC CE includes only one beam for each neighbor cell of the UE.16.The UE of claim 1, wherein the at least one processor is configured to cause the UE to apply a logical channel prioritization (LCP) procedure when a transmission is performed by the UE, wherein:a medium access control (MAC) control element (CE) for a buffer status report (BSR) or an extended BSR has a priority higher than a MAC CE including the L1 measurement report; andthe MAC CE including the L1 measurement report has a priority higher than a MAC CE for a positioning measurement gap activation or deactivation request.17.The UE of claim 1, wherein the at least one processor is configured to cause the UE to:determine that at least one L1 measurement report has been triggered and not cancelled; andif one or more uplink (UL) resources are available for a transmission and the one or more UL resources can accommodate a medium access control (MAC) control element (CE) and a sub-header of the MAC CE and the at least one L1 measurement report, instruct a multiplexing and assembly procedure to generate the MAC CE; orif the one or more UL resources are not available or if the one or more UL resources cannot accommodate the MAC CE and the sub-header of the MAC CE, trigger a scheduling request (SR) transmission.18.The UE of claim 17, wherein the SR transmission is triggered if the SR transmission is configured with a value enabled.19.A base station (BS) , comprising:at least one memory; andat least one processor coupled to the at least one memory and configured to cause the BS to:receive, from a user equipment (UE) , capability information indicating that the UE supports an event based layer-1 (L1) measurement report;transmit, to the UE, a first configuration related to a L1 measurement report, wherein the first configuration includes information of at least one event; andreceive, from the UE, the L1 measurement report in response to fulfillment of the at least one event.20.A method performed by a user equipment (UE) , comprising:transmitting capability information indicating that the UE supports an event based layer-1 (L1) measurement report;receiving a first configuration related to a L1 measurement report, wherein the first configuration includes information of at least one event; andtransmitting the L1 measurement report in response to fulfillment of the at least one event.
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