Method and apparatus of supporting beam reporting
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- LENOVO (BEIJING) LTD
- Filing Date
- 2023-07-27
- Publication Date
- 2026-06-03
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Figure 1.1
Abstract
Description
METHOD AND APPARATUS OF SUPPORTING BEAM REPORTINGTECHNICAL FIELD
[0001] The present disclosure relates to wireless communications, and more specifically to technique of supporting beam reporting.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 resources (e.g., symbols, slots, subframes, frames, or the like) or frequency 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 disclosure. 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 method and apparatuses described herein may further include a UE for wireless communication, which includes: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the UE to:receive information indicating periodic downlink (DL) reference signals (RSs) associated with all activated joint or DL transmission configuration indication (TCI) states of an activated bandwidth part (BWP) of a serving cell; determine whether an event associated with a UE initiated beam report is triggered based on measurements of the periodic DL RSs; and transmit the UE initiated beam report in a physical uplink shared channel (PUSCH) in the case that the event associated with the UE initiated beam report is triggered.
[0005] In some implementations of the method and apparatuses described herein, there are N, N>=2, activated joint or DL TCI states associated with each transmit-receive point (TRP) of one or multiple TRPs in the activated BWP of the serving cell, including an indicated joint or DL TCI state and (N-1) non-indicated joint or DL TCI states other than the indicated joint or DL TCI state, wherein, the indicated joint or DL TCI state is a joint or DL TCI state indicated to be applicable from a time instance in the BWP for the TRP, N is same or different for different TRPs, and the at least one processor is configured to cause the UE to: in the case that multiple UE initiated beam reports are configured for multiple TRPs, wherein each UE initiated beam report is associated with a corresponding TRP of the multiple TRPs, determine an event associated with a UE initiated beam report associated with a TRP is triggered in the case that a result of a quality of service (QoS) metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with the TRP minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to a threshold; and in the case that one UE initiated beam report is configured for the one or multiple TRPs, determine an event associated with the one UE initiated beam report is triggered in the case that a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with a TRP of the one or multiple TRPs minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to a threshold.
[0006] In some implementations of the method and apparatuses described herein, the at least one processor is configured to cause the UE to: determine an event associated with a UE initiated beam report is triggered in the case that a value of a counter associated with the event is larger than or equal to a maximum counter value associated with the event before a timer associated with the event expiries.
[0007] In some implementations of the method and apparatuses described herein, there is one or multiple TRPs in the serving cell, and there are N, N>=2, activated joint or DL TCI states associated with each TRP of the one or multiple TRPs, including an indicated joint or DL TCI state associated with the TRP and (N-1) non-indicated joint or DL TCI states associated with the TRP other than the indicated joint or DL TCI state associated with the TRP, wherein, the indicated joint or DL TCI state associated with the TRP is a joint or DL TCI state indicated to be applicable from a time instance in the BWP for the TRP, N is same or different for different TRPs, and wherein, the counter, the maximum counter value, the timer, and a threshold associated with an event are configured for each of the one or multiple TRPs, and in response to starting a procedure of determining whether an event associated with a UE initiated beam report is triggered, the at least one processor is configured to cause the UE to: increase the value of the counter associated with a TRP by 1 in the case that a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with the TRP minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to a threshold associated with the TRP; and start or restart the timer associated with the TRP in response to a first determination of a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with the TRP minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to the threshold.
[0008] In some implementations of the method and apparatuses described herein, in the case that the corresponding periodic DL RS of the indicated joint or DL TCI states associated with the TRP changes, the at least one processor is configured to cause the UE to reset the value of the counter associated with the TRP to an initial value.
[0009] In some implementations of the method and apparatuses described herein, in the case that one UE initiated beam report is configured for the one or multiple TRPs, the at least one processor is configured to cause the UE to: determine whether the event associated with the one UE initiated beam report is triggered according to the counter associated with any TRP of the one or more TRPs; and in the case that multiple UE initiated beam reports are configured for multiple TRPs, wherein each UE initiated beam report is associated with a corresponding TRP of the multiple TRPs, the at least one processor is configured to cause the UE to: determine whether an event associated with a UE initiated beam report associated with a TRP of the multiple TRPs is triggered according to the counter associated with the TRP.
[0010] In some implementations of the method and apparatuses described herein, there is one or multiple TRPs in the serving cell, and there are N, N>=2, activated joint or DL TCI states associated with each TRP of the one or multiple TRPs, including an indicated joint or DL TCI state associated with the TRP and (N-1) non-indicated joint or DL TCI states associated with the TRP other than the indicated joint or DL TCI state associated with the TRP, wherein, the indicated joint or DL TCI state associated with the TRP is a joint or DL TCI state indicated to be applicable from a time instance in the BWP for the TRP, N is same or different for different TRPs, and wherein, the counter, the maximum counter value, the timer, and a threshold associated with an event are configured for all of the one or multiple TRPs, and in response to starting a procedure of determining whether an event associated with a UE initiated beam report is triggered, the at least one processor is configured to cause the UE to: increase the value of the counter by 1 in the case that a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with a TRP of the one or multiple TRPs in the serving cell minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to a threshold; and start or restart the timer in response to a first determination in the serving cell of a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with a TRP of the one or multiple TRPs in the serving cell minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to the threshold.
[0011] In some implementations of the method and apparatuses described herein, in the case that a corresponding periodic DL RS of the indicated joint or DL TCI states associated with a TRP in the serving cell changes, the at least one processor is configured to cause the UE to reset the value of the counter to an initial value.
[0012] In some implementations of the method and apparatuses described herein, one UE initiated beam report is configured by network side, and the at least one processor is configured to cause the UE to: determine whether the event associated with the one UE initiated beam report is triggered according to the counter.
[0013] In some implementations of the method and apparatuses described herein, the at least one processor is configured to cause the UE to: receive a prohibit timer associated with determining whether an event associated with a UE initiated beam report is triggered; and determine whether an event associated with a UE initiated beam report is triggered based on measurements of the periodic DL RSs after the prohibit timer expiries.
[0014] In some implementations of the method and apparatuses described herein, the at least one processor is configured to cause the UE to: receive dedicated SR configuration indicating a dedicated SR resource for transmitting an indication of event associated with UE initiated beam report being triggered, wherein, the UE initiated beam report is an aperiodic channel state information (CSI) report associated with the dedicated SR resource.
[0015] In some implementations of the method and apparatuses described herein, the at least one processor is configured to cause the UE to: transmit an indication of event associated with UE initiated beam report being triggered in the dedicated SR resource; and receive uplink grant DL control information (DCI) to trigger transmission of the UE initiated beam report associated with the dedicated SR request resource.
[0016] In some implementations of the method and apparatuses described herein, the indication of event associated with UE initiated beam report being triggered transmitted in the dedicated SR resource is multiplexed in a PUSCH in the case that the dedicated SR resource is overlapped with the PUSCH in time domain.
[0017] In some implementations of the method and apparatuses described herein, the at least one processor is configured to cause the UE to: transmit an indication of event associated with UE initiated beam report not being triggered in the dedicated SR resource, wherein, the indication of event associated with UE initiated beam report not being triggered transmitted in the dedicated SR resource is multiplexed in a PUSCH in the case that the dedicated SR resource is overlapped with the PUSCH in time domain.
[0018] In some implementations of the method and apparatuses described herein, the at least one processor is configured to cause the UE to: transmit a UE initiated beam report in the case that the event associated with the UE initiated beam report is triggered in a media access control (MAC) control element (CE) in the PUSCH based on measurements of DL RSs same as or different from the periodic DL RSs for determining whether an event associated with a UE initiated beam report is triggered.
[0019] In some implementations of the method and apparatuses described herein, there is one or multiple TRPs in the serving cell, and there are N, N>=2, activated joint or DL TCI states associated with each TRP of the one or more TRPs, including an indicated joint or DL TCI state associated with the TRP and (N-1) non-indicated joint or DL TCI states associated with the TRP other than the indicated joint or DL TCI state associated with the TRP, wherein, the indicated joint or DL TCI state associated with the TRP is a joint or DL TCI state indicated to be applicable from a time instance in the BWP for the TRP, N is same or different for different TRPs, and wherein, the UE initiated beam report in the MAC CE is based on the measurements of DL RSs in a TRP and the DL RSs are same as the periodic DL RSs for determining whether the event associated with the UE initiated beam report is triggered, and wherein, at most M, M>=1, reference resource indicators (RSIs) associated with the TRP are reported in the MAC CE, wherein a differential QoS metric of a DL RS corresponding to a RSI of the at most M RSIs is larger than or equal to a threshold for determining whether the event associated with the UE initiated beam report is triggered, and each differential QoS metric of the DL RS is a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with the TRP minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP.
[0020] In some implementations of the method and apparatuses described herein, there are (M-1) indicator fields in the MAC CE, and each indicator indicates whether a corresponding RSI of M RSIs corresponding to the DL RSs except for a first RSI is reported by 1 bit.
[0021] In some implementations of the method and apparatuses described herein, there are M RSI fields in the MAC CE, and the length of the RSI field is 3 bits.
[0022] In some implementations of the method and apparatuses described herein, RSI set as 0 means a periodic DL RS associated with an activated joint or DL TCI state with a lowest codepoint in a TCI state activation MAC CE associated with the TRP, RSI set as 1 means a periodic DL RS associated with an activated joint or DL TCI state with a second lowest codepoint in the TCI state activation MAC CE associated with the TRP, and so on.
[0023] In some implementations of the method and apparatuses described herein, RSI set as 0 means a periodic DL RS associated with a lowest index of all periodic DL RSs associated with all the activated joint or DL TCI states associated with the TRP, RSI set as 1 means a RS with a second lowest index of all periodic DL RSs associated with all the activated joint or DL TCI states associated with the TRP, and so on.
[0024] In some implementations of the method and apparatuses described herein, there are at most M QoS metric fields in the MAC CE, and each QoS metric is corresponding to a reported RSI, wherein a length of a first QoS metric field is always 7 bits while a length of other QoS metric fields is 7 bits or 4 bits.
[0025] In some implementations of the method and apparatuses described herein, there are multiple TRPs in the serving cell, and each MAC CE includes a field for indicating with which TRP the UE initiated beam report in the MAC CE is associated.
[0026] In some implementations of the method and apparatuses described herein, there is one or two TRPs in the serving cell, and there are N, N>=2, activated joint or DL TCI states associated with each TRP of the one or two TRPs, including an indicated joint or DL TCI state associated with the TRP and (N-1) non-indicated joint or DL TCI states associated with the TRP other than the indicated joint or DL TCI state associated with the TRP, wherein, the indicated joint or DL TCI state associated with TRP is a joint or DL TCI state indicated to be applicable from a time instance in the BWP for the TRP, N is same or different for different TRPs, and wherein, the UE initiated beam report in the MAC CE is based on the measurements of DL RSs in each TRP and the DL RSs are same as the periodic DL RSs for determining whether the event associated with the UE initiated beam report is triggered, and wherein, at most 2*M, M>=1, RSIs associated with the one or two TRPs are reported in the MAC CE, wherein a differential QoS metric of a DL RS corresponding to RSI of the at most 2*M RSIs is larger than or equal to a threshold for determining whether the event associated with the UE initiated beam report is triggered, and each differential QoS metric of the DL RS is a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with a corresponding TRP minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the corresponding TRP.
[0027] In some implementations of the method and apparatuses described herein, there are at least (2*M-1) indicator fields in the MAC CE, and each indicator indicates whether a corresponding RSI is reported by 1 bit.
[0028] In some implementations of the method and apparatuses described herein, there are 2*M RSI fields in the MAC CE, the length of the RSI field is 3 bits, and for each TRP of the one or two TRPs, RSI set as 0 means a periodic DL RS associated with an activated joint or DL TCI state with a lowest codepoint of all activated joint or DL TCI states associated with the TRP in a TCI state activation MAC CE, RSI set as 1 means a periodic DL RS associated with an activated joint or DL TCI state with a second lowest codepoint of all activated joint or DL TCI states associated with the TRP in the TCI state activation MAC CE, and so on.
[0029] In some implementations of the method and apparatuses described herein, there are 2*M RSI fields in the MAC CE, the length of the RSI field is 3 bits, and for each TRP of the one or two TRPs, RSI set as 0 means a periodic DL RS associated with a lowest index of all periodic DL RSs associated with all the activated joint or DL TCI states associated with the TRP, RSI set as 1 means a periodic DL RS with a second lowest index of all periodic DL RSs associated with all the activated joint or DL TCI states associated with the TRP, and so on.
[0030] In some implementations of the method and apparatuses described herein, there are 2*M RSI fields in the MAC CE, the length of the RSI field is 4 bits, and for each TRP of the one or two TRPs, RSI set as 0 means a periodic DL RS associated with a lowest index of all periodic DL RSs associated with all the activated joint or DL TCI states associated with the two TRPs, RSI set as 1 means a periodic DL RS with a second lowest index of all periodic DL RSs associated with all the activated joint or DL TCI states associated with the two TRPs, and so on.
[0031] In some implementations of the method and apparatuses described herein, there are at most 2*M QoS metric fields in the MAC CE, and each QoS metric is corresponding to a reported RSI, wherein a length of a QoS metric field is 7 bits or 4 bits.
[0032] In some implementations of the method and apparatuses described herein, the UE initiated beam report in the MAC CE is based on the measurements of DL RSs different from the periodic DL RSs for determining whether the event associated with the UE initiated beam report is triggered, wherein the UE initiated beam report is a CSI report configured with a type different from ‘periodic’ , ‘semi-persistent’ and ‘aperiodic. ’
[0033] In some implementations of the method and apparatuses described herein, the DL RSs for the UE initiated beam report are configured to be all periodic, or to be either periodic or semi-persistent.
[0034] In some implementations of the method and apparatuses described herein, the UE initiated beam report in the MAC CE is based on the measurements of a set of periodic DL RSs configured separately from the RSs for determining whether the event associated with the UE initiated beam report is triggered, wherein there are M, M>=1 reference resource indicator (RSI) fields in the MAC CE, M RSIs indicates M periodic DL RSs from the set of periodic DL RSs and a length of each RSI field is determined by a number of the DL RS set configured for the UE initiated beam report.
[0035] In some implementations of the method and apparatuses described herein, there are M QoS metric fields in the MAC CE, and each QoS metric corresponds to a reported RSI, wherein a length of a first QoS metric field is always 7 bits while a length of other QoS metric fields is 7 bits or 4 bits.
[0036] In some implementations of the method and apparatuses described herein, the set of periodic DL RSs is a candidate resource set of candidate resource sets configured for beam failure recovery.
[0037] In some implementations of the method and apparatuses described herein, in the case that one UE initiated beam report is configured by network side, only one set of periodic DL RSs is configured; and in the case that two UE initiated beam reports are configured by network side, two sets of periodic DL RSs are one to one configured for the two UE initiated beam reports.
[0038] In some implementations of the method and apparatuses described herein, M is configured by radio resource control (RRC) or predefined.
[0039] In some implementations of the method and apparatuses described herein, whether QoS metrics are reported is configured by RRC or predefined.
[0040] In some implementations of the method and apparatuses described herein, the threshold is configured by RRC signaling.
[0041] In some implementations of the method and apparatuses described herein, the counter, the maximum counter value and the timer are configured by RRC signaling.
[0042] In some implementations of the method and apparatuses described herein, a QoS metric is reference signal receiving power (RSRP) .
[0043] In some implementations of the method and apparatuses described herein, in the case that two control resource set (CORESET) pool index values are configured, two activated joint or DL TCI states are associated with one TRP in the case that the two activated joint or DL TCI states are associated with a same CORESET pool index value; and in the case that at least two joint or DL TCI states are activated in a codepoint of a TCI state activation MAC CE and each joint or DL TCI state in a codepoint of the MAC CE is indicated as a first TCI state or a second TCI state, two activated joint or DL TCI states are associated with one TRP in the case that the two activated joint or DL TCI states are both indicated as the first TCI state or both indicated as the second TCI state; otherwise, any two activated joint or DL TCI states are associated with one TRP.
[0044] Some implementations of the method and apparatuses described herein may further include a processor for wireless communication, which includes: at least one controller coupled with at least one memory and configured to cause the processor to: receive information indicating periodic DL RSs associated with all activated joint or DL TCI states of an activated BWP of a serving cell; determine whether an event associated with a UE initiated beam report is triggered based on measurements of the periodic DL RSs; and transmit the UE initiated beam report in a PUSCH in the case that the event associated with the UE initiated beam report is triggered.
[0045] Some implementations of the method and apparatuses described herein may further include a network equipment (NE) for wireless communication, which includes: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the RAN node to: transmit information indicating periodic DL RSs associated with all activated joint or DL TCI states of an activated BWP of a serving cell, so that whether an event associated with a UE initiated beam report is triggered will be determined based on measurements of the periodic DL RSs in UE; and receive a UE initiated beam report in a PUSCH in the case that the event associated with the UE initiated beam report is triggered.
[0046] Some implementations of the method and apparatuses described herein may further include a method performed by a UE, including: receiving information indicating periodic DL RSs associated with all activated joint or DL TCI states of an activated BWP of a serving cell; determining whether an event associated with a UE initiated beam report is triggered based on measurements of the periodic DL RSs; and transmitting the UE initiated beam report in a PUSCH in the case that the event associated with the UE initiated beam report is triggered.BRIEF DESCRIPTION OF THE DRAWINGS
[0047] Figure 1 illustrates an example of a wireless communications system in accordance with aspects of the present disclosure.
[0048] Figure 2 is an example of a beam report MAC CE for S-TRP in accordance with aspects of the present disclosure.
[0049] Figure 3 is an example of a beam report MAC CE for M-TRP in accordance with aspects of the present disclosure.
[0050] Figure 4 illustrates an example of a UE 400 in accordance with aspects of the present disclosure.
[0051] Figure 5 illustrates an example of a processor 500 in accordance with aspects of the present disclosure.
[0052] Figure 6 illustrates an example of a NE 600 in accordance with aspects of the present disclosure.
[0053] Figure 7 illustrate a flowchart of method performed by a UE in accordance with aspects of the present disclosure.
[0054] Figure 8 illustrate a flowchart of method performed by a NE in accordance with aspects of the present disclosure.DETAILED DESCRIPTION
[0055] Beam management is an important topic in multiple-input multiple-output (MIMO) for new radio (NR) . A "beam" can be represented by or be associated with spatial relation information, TCI state, or RS etc. A legacy beam report is a CSI report configured by the network side, e.g., by a gNB which can be periodic, semi-persistent or aperiodic, wherein, RSI (s) , e.g., CSI-RS resource indicator (CRI) (s) or SSB resource indicator (SSBRI) with corresponding layer 1 (L1) -RSRP or L1-signal to interference plus noise ratio (SINR) can be reported. For a periodic beam report, it is carried by a physical uplink control channel (PUCCH) resource. For a semi-persistent or aperiodic beam report, it is carried by a PUCCH resource or a PUSCH (or PUSCH resource) , which is configured by RRC. For an aperiodic beam report, it is carried by a PUSCH. The details of L1-RSRP report and L1-SINR report have been drafted in 3GPP TS38.214.
[0056] Considering further enhancements on MIMO, UE initiated beam reporting is desired by the industry to reduce the overhead and latency of beam management. However, no details of UE initiated beam reporting have been discussed yet, e.g., how to determine whether an event (or conditions or the like) associated a UE initiated beam report is triggered (or is satisfied) , how to indicate the network side that the event associated a UE initiated beam report has been triggered, and how to transmit the UE initiated beam report associated with the triggered event to the network side etc.
[0057] At least considering the above issues, aspects of the present disclosure propose a technical solution of supporting beam reporting, e.g., methods and apparatuses of supporting beam reporting.
[0058] For example, regarding how to determine whether an event associated with a UE initiated beam report is triggered, some implementations of the method and apparatuses described herein propose: receiving information indicating periodic DL RSs associated with all activated joint or DL TCI states of an activated BWP of a serving cell by a UE from a NE, and determining whether an event associated with a UE initiated beam report is triggered by the UE based on measurements of the periodic DL RSs, e.g., by calculating a RSRP difference associated with a TRP. The RSRP difference is defined as a RSRP of a periodic DL RS associated with a non-indicated joint or DL TCI state associated with the TRP minus a RSRP of a periodic DL RS associated with the indicated joint or DL TCI state associated with the same TRP. Regarding an indicated joint or DL TCI state of a TRP in an BWP of a serving cell, it is an activated joint or DL TCI state indicated to be applicable from a time instance in the BWP for the TRP. An indicated joint or DL TCI state may also be referred to as an applicable joint or DL TCI state, and accordingly, a non-indicated joint or DL TCI state may also be referred to as a non-applicable joint or DL TCI state.
[0059] Some implementations of the method and apparatuses described herein also propose transmitting the UE initiated beam report in a PUSCH by the UE to the NE in the case that the event associated with the UE initiated beam report is triggered.
[0060] Regarding how to indicate the NE that an event associated with a UE initiated beam report is triggered and report the associated UE initiated beam report, there are various implementations. For example, in some implementations of the method and apparatuses described herein, a SR resource, e.g., a PUCCH resource in a dedicated SR configuration is used to send an indication of event associated with UE initiated beam report being triggered, and the associated UE initiated beam report is transmitted by a PUSCH which is triggered by DCI in a physical downlink control channel (PDCCH) . In some other implementations of the method and apparatuses described herein, a normal (non-dedicated) SR resource in a normal SR configuration is used to send the indication of event associated with UE initiated beam report being triggered, and the related UE initiated beam report is transmitted in a MAC CE.
[0061] Regarding the content and related configuration of the UE initiated beam report, there are also various implementations. For example, in some implementations of the method and apparatuses described herein, the UE initiated beam report is measured based on all the periodic DL RSs associated with all the non-indicated joint or DL TCI states of all the activated joint or DL TCI states for DL transmission. M or 2*M periodic DL RSs are reported in a MAC CE where the corresponding RSRP can be reported together or not. M can be configured by RRC or predefined (fixed) in the specification. In some other implementations of the method and apparatuses described herein, the UE initiated beam report is not related to the DL RSs for determination of whether an event associated with a UE initiated beam report is triggered. The configuration of the UE initiated beam report is separately configured, which can be a CSI report with a new type other than ‘periodic’ , ‘semi-persistent’ or ‘aperiodic. ’ In some yet other implementations of the method and apparatuses described herein, a set of periodic DL RSs is configured for a UE initiated beam report, where the report content is based on the measurement of the set of periodic DL RSs. M RSIs, each indicating one periodic DL RS of the set of periodic DL RSs, and the corresponding RSRP values are reported in the UE initiated beam report. Similarly, M can be configured by RRC or predefined (or fixed) , e.g., configured as 1.
[0062] It can be seen, the technical solution of supporting beam reporting disclosed in the present disclosure solve key technical problems on how to support UE initiated beam reporting, and accordingly will facilitate the implementations of UE initiated beam reporting and further enhance MIMO in NR.
[0063] Aspects of the present disclosure are described in the context of a wireless communications system.
[0064] Figure 1 illustrates an example of a wireless communication system 100 in accordance with aspects of the present disclosure. The wireless communication system 100 may include one or more NE 102, one or more UE 104, and a CN 106. The wireless communication system 100 may support various radio access technologies. In some implementations, the wireless communication 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 communication 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 communication 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 communication system 100 may support radio access technologies beyond 5G, for example, 6G. Additionally, the wireless communication system 100 may support technologies, such as time division multiple access (TDMA) , frequency division multiple access (FDMA) , or code division multiple access (CDMA) , etc.
[0065] The one or more NE 102 may be dispersed throughout a geographic region to form the wireless communication 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 RAN, a RAN node, 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.
[0066] 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 112 associated with the same or different radio access technologies may overlap, but the different geographic coverage areas 112 may be associated with different NE 102.
[0067] The one or more UE 104 may be dispersed throughout a geographic region of the wireless communication 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.
[0068] 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 114 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.
[0069] 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, 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 TRPs.
[0070] 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.
[0071] The CN 106 may communicate with a packet data network over one or more backhaul links (e.g., via an S1, N2, 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) .
[0072] In the wireless communication system 100, the NEs 102 and the UEs 104 may use resources of the wireless communication 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.
[0073] One or more numerologies may be supported in the wireless communication 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.
[0074] 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.
[0075] 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 communication 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.
[0076] In the wireless communication 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 communication 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.
[0077] 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.
[0078] Based on the unified TCI state framework, one MAC CE from the network side, e.g., from a gNB will activate one or multiple TCI states in an activated BWP of a serving cell for single TRP (S-TRP) operations or single DCI (S-DCI) based multi-TRP (M-TRP) operations, or each of two MAC CEs will activate one or multiple TCI states for multi-DCI (M-DCI) based M-TRP operations. Regarding a TCI state, it can be a joint TCI state or a DL TCI state or an uplink (UL) TCI state under the unified TCI state frame. An indicated state of all the activated TCI states is a TCI state indicated to be applicable from a time instance. Other TCI state (s) of the all the activated TCI states except from the indicated TCI state is non-indicated TCI state. For example, one joint TCI state or one pair of DL and UL TCI state among all the activated TCI states will be applicable for transmission by DCI indication for S-TRP operations which are applied starting from the first slot that is at least beamAppTime symbols after the last symbol of the PUCCH or the PUSCH with hybrid automatic repeat request (HARQ) -acknowledge (HARQ-ACK) information corresponding to the DCI carrying a TCI state indication and without DL assignment, or corresponding to a physical downlink shared channel (PDSCH) scheduled by a DCI carrying a TCI state indication or from the first slot that is at least 3 millisecond after the last symbol of the PUCCH or the PUSCH with HARQ-ACK information corresponding to the TCI activation MAC CE indicating only one codepoint and carrying the TCI state. Two joint TCI states or two pairs of DL and UL TCI states among all the activated TCI states will be applicable for transmission by DCI indication for M-TRP operation which are applied starting from the first slot that is at least beamAppTime symbols after the last symbol of the PUCCH or the PUSCH with HARQ-ACK information corresponding to a DCI carrying a TCI State indication and without DL assignment, or corresponding to a PDSCH scheduled by a DCI carrying a TCI state indication or from the first slot that is at least 3 millisecond after the last symbol of the PUCCH or the PUSCH with HARQ-ACK information corresponding to the TCI activation MAC CE indicating only one codepoint and carrying the TCI state.
[0079] One or two source RSs will be configured to be associated with a TCI state. When two source RSs are configured for a TCI state, only the source RS with quasi co-location (QCL) type D is used. Otherwise, the source RS configured for the TCI state is used. In order to simplify the descriptions, herein, the source RS of a TCI state in the following is the source RS with QCL type D if two source RSs are configured to be associated with the TCI state, or is the only source RS if only one source RS configured to be associated with the TCI state.
[0080] In addition, a source RS of a unified TCI state may be a CSI-RS, which is not always a periodic RS. When the source RS is not a periodic RS, a periodic RS can be determined according to the QCL relation of the non-periodic RS. Therefore, one periodic RS, e.g., a periodic CSI-RS or SSB, can be determined to be associated with a source RS of a TCI state. That is, a periodic CSI-RS or SSB can be associated with a TCI state. Moreover, the periodic CSI-RS or SSB associated with a TCI state can be regarded as a beam associated with the TCI state.
[0081] Generally, the network side, e.g., gNB will indicate one or two joint TCI states, or one or two pairs of DL and UL TCI states for a UE with good beam quality. However, the indicated beam (s) may not be good for the UE any more due to UE mobility or channel change. The network side, e.g., a gNB may also indicate periodic DL RSs, e.g., periodic CSI-RSs or SSBs associated with all activated joint or DL TCI states of an activated BWP of a serving cell. UE will measure the periodic DL RSs associated with the activated joint or DL TCI states to be aware of whether the indicated beam (s) is suit for itself, and further determine whether an event associated with a UE initiated beam report is triggered. In accordance with aspects of the present disclosure, the periodic CSI-RS used as the DL RSs for measurements can be a tracking reference signal (TRS) , which is a CSI-RS configured with “trs-Inf” or a CSI-RS configured with ‘repetition. ’
[0082] In addition, there may be one or multiple, e.g., one or two TRPs in an activated BWP of the serving cell. It is assumed that there are N, N>=2, activated joint or DL TCI states associated with each TRP of the one or multiple TRPs, including one indicated joint or DL TCI state and (N-1) non-indicated joint or DL TCI states other than the indicated joint or DL TCI state. N is identical or different for different TRPs. A TRP can be represented by various manners, and thus associations between TCI state and TRP in different scenarios may be determined in different manners. In the case that two CORESET pool index values, e.g., CORESETPoolIndex 0 and CORESETPoolIndex 1, are configured, two activated joint or DL TCI states are associated with one TRP in the case that the two activated joint or DL TCI states are associated with the same CORESET pool index value. In the case that at least two joint or DL TCI states are activated in a codepoint of a TCI state activation MAC CE and each joint or DL TCI state in a codepoint of the MAC CE is indicated as a first or a second TCI state, two activated joint or DL TCI states are associated with one TRP in the case that the two activated joint or DL TCI states are both indicated as the first TCI state or both indicated as the second TCI state; otherwise, any two activated joint or DL TCI states are associated with one TRP. Persons skilled in the art should well know, although only cases of multiple (N>=2) activated joint or DL TCI stated in a TRP are illustrated herein, UE initiated beam reporting is also applicable for TRP (s) with only one activated joint or DL TCI state, which can be well understood by persons skilled in the art under the illustrated disclosure and teaching and thus will not be detailed herein.
[0083] For example, for exemplary S-TRP operations (or S-TRP scenarios, or S-TRP) , any two activated joint or DL TCI states are associated with the same TRP. For exemplary M-DCI based M-TRP operations, two CORESET pool index values are configured, and each CORESET pool index value represents a TRP. Two activated joint or DL TCI states associated with the same CORESETPoolIndex value are associated with the same TRP. For exemplary S-DCI based M-TRP operations, at least one codepoint in the MAC CE activating joint or separate DL / UL TCI states is mapped to two joint or DL TCI states and each TCI state in one TCI codepoint is indicated as the first TCI state (representing the first TRP) or the second TCI state (representing the second TRP) . Therefore, two different activated joint or DL TCI states which are both indicated as the first TCI state or the second TCI state are associated with the first TRP or the second TRP respectively.
[0084] The network, e.g., a gNB may configure one or multiple UE initiated beam reports, each UE initiated beam report is associated a corresponding event, which may be predefined (or fixed) in the specification. An event may be associated with one TRP or multiple TRPs. For example, in the scenarios of S-TRP, only one UE initiate beam report will be configured for an event. In the scenarios of M-DCI based M-TRP, one or multiple UE initiated beam reports can be configured. In the case that multiple UE initiated beam reports, e.g., two UE initiated beam reports are configured to be associated with two TRPs respectively, e.g., two CORSET pool index values respectively, each UE initiated beam report is associated with an event. Similarly, in the scenarios of S-DCI based M-TRP, one or multiple UE initiated beam reports can be configured. In the case that multiple UE initiated beam reports, e.g., two UE initiated beam reports are configured to be associated with two TRPs respectively, e.g., two TCI states respectively, each UE initiated beam report is associated with an event.
[0085] Based on the above, some more detailed implementations of the method and apparatuses in accordance with aspects of the present disclosure are illustrated as follows. Scheme 1: Determination of whether an event associated with a UE initiated beam report is triggered
[0086] Whether an event associated with a UE initiated beam report is triggered can be determined based on measurements of DL periodic RSs as described above in various manners, e.g., according to one shot measurement or according to a procedure similar to a beam failure recovery (BFR) procedure. Regarding the expression 'whether an event associated with a UE initiated beam report is triggered, ' it may also be referred to as a triggering state of an event associated with a UE initiated beam report, wherein, when an event associated with a UE initiated beam report is triggered, the triggering state is positive and when an event associated with a UE initiated beam report is not triggered, the triggering state is negative.
[0087] Scheme 1-1
[0088] In accordance with aspects of the present disclosure, whether an event associated with a UE initiated beam report is triggered is determined based on one shot measurements of DL periodic RSs in scheme 1-1. In the case that multiple UE initiated beam reports are configured for multiple TRPs, wherein each UE initiated beam report is associated with a corresponding TRP of the multiple TRPs, UE will determine that an event associated with a UE initiated beam report associated with a TRP is triggered in the case that a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with the TRP minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to a threshold which is configured, e.g., by RRC. In the case that one UE initiated beam report is configured for the one or multiple TRPs, UE will determine that an event associated with the one UE initiated beam report is triggered in the case that a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with a TRP of the one or multiple TRPs minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to a threshold.
[0089] For example, there are one or two TRPs. A QoS metric is RSRP, and accordingly, a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with a TRP minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is referred to as a RSRP difference or delta RSRP or the like.
[0090] When there are N activated joint or DL TCI states associated with a TRP, there are (N-1) delta RSRPs associated with the TRP. If only one UE initiated beam report is configured to be associated with an event and any of the (N-1) delta RSRPs associated with a TRP associated with the event is larger than or equal to a threshold which is configured, e.g., by RRC, then the event associated the one UE initiated beam report is triggered. If two UE initiated beam reports are configured, each UE initiated beam report is associated with an event associated with a corresponding TRP of the two TRPs. If any of the (N-1) delta RSRPs associated with the corresponding TRP is larger than or equal to a configured threshold, then the event associated with a UE initiated beam report associated with the corresponding TRP is triggered.
[0091] Scheme 1-2
[0092] In accordance with aspects of the present disclosure, whether an event associated with a UE initiated beam report is triggered is determined based on a measurement procedure associated with more parameters, e.g., counter and timer etc., rather than one shot measurement. For example, UE will determine that an event associated with a UE initiated beam report is triggered in the case that a value of a counter associated with the event is larger than or equal to the maximum counter value associated with the event before the timer associated with the event expiries.
[0093] In some implementations of the present disclosure, a prohibit timer associated with determining whether an event associated with a UE initiated beam report is triggered will be configured. Determination of whether an event associated with a UE initiated beam report is triggered is stopped before the prohibit timer expires. That is, UE will determine whether an event associated with a UE initiated beam report is triggered based on measurements of the periodic DL RSs after the prohibit timer expiries.
[0094] For example, in some cases of the present disclosure (schemen1-2a) , a timer, a threshold, a counter, and a maximum counter value are configured per TRP, e.g., by RRC. The initial value of the counter can be 0. Thus, in the case that there are multiple TRPs, e.g., two TRPs, two timers, two thresholds, two counters and two maximum counter values are configured for each TRP respectively. The counters, timers, thresholds and maximum counter values for different TRPs may be the same or different. For example, two thresholds can be the same, and the two maximum counter values can be the same too.
[0095] In the case that one UE initiated beam report is configured for the one or multiple TRPs, UE will determine whether the event associated with the one UE initiated beam report is triggered according to a counter (any one) associated with a corresponding TRP of the one or more TRPs. In the case that multiple UE initiated beam reports are configured for multiple TRPs, wherein each UE initiated beam report is associated with a corresponding TRP of the multiple TRPs, UE will determine whether an event associated with a UE initiated beam report associated with a TRP of the multiple TRPs is triggered according to the counter associated with the TRP.
[0096] More specifically, in response to starting a procedure of determining whether an event associated with a UE initiated beam report is triggered, the UE will increase the value of the counter associated with a TRP, e.g., by 1 (the step can be variously defined) in the case that a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with the TRP minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to a threshold associated with the TRP. Regarding the timer, in response to starting a procedure of determining whether an event associated with a UE initiated beam report is triggered, the UE will start or restart the timer associated with the TRP only in response to the first determination of a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with the TRP minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to the threshold.
[0097] When the corresponding periodic DL RS of the indicated joint or DL TCI states associated with the TRP changes, UE will reset the value of the counter associated with the TRP to an initial value, e.g., 0. UE will also reset the timer. That is, a procedure of determining whether an event associated with a UE initiated beam report is triggered will be restarted.
[0098] For example, there are one or two TRPs. A QoS metric is RSRP, and accordingly, a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with a TRP minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is a RSRP difference or delta RSRP or the like.
[0099] During a procedure of determining whether an event associated with a UE initiated beam report is triggered, if any of the (N-1) delta RSRPs associated with a TRP is the first one being larger than or equal to the associated threshold (first time) , the timer associated with the TRP will be started or restarted; and if any of the (N-1) delta RSRPs associated with a TRP is larger than or equal to the associated threshold (every time) , the counter associated with the TRP is added by 1. When only one UE initiated beam report is configured to be associated with an event, and before the timer associated with a TRP expires, if the counter associated with the TRP is equal or larger than the maximum counter value associated with the TRP, the event associated with the only one UE initiated beam report will be triggered. When two UE initiated beam reports are configured for two TRPs, wherein each UE initiated beam report is associated with an event associated with a corresponding TRP of the two TRPs, and before the timer associated with the corresponding TRP expires, if the counter associated with the corresponding TRP is equal or larger than the maximum counter value associated with the corresponding TRP, an event associated with the UE initiated beam report associated with the TRP will be triggered.
[0100] In some other cases of the present disclosure (scheme 1-2b) , a counter, a maximum counter value, a timer, and a threshold associated with an event are configured for all of the one or multiple TRPs in the serving cell, rather than for each TRP. That is, there is only one counter, one maximum counter value, one timer, and one threshold. Accordingly, only one UE initiated beam report can be configured even if there are multiple TRPs.
[0101] In response to starting a procedure of determining whether an event associated with a UE initiated beam report is triggered, UE will increase the value of the counter, e.g. by 1 in the case that a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with a TRP (any one) of the one or multiple TRPs minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to a threshold. Regarding the timer, in response to starting a procedure of determining whether an event associated with a UE initiated beam report is triggered, UE will start or restart the timer in response to the first determination among the one or multiple TRPs (not in a certain TRP) of a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with a TRP of the one or multiple TRPs minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to the threshold.
[0102] In the case that the corresponding periodic DL RS of the indicated joint or DL TCI states associated with a TRP (any one) in the serving cell changes, UE will reset the value of the counter to the initial value, e.g., 0. UE will also reset the timer. That is, a procedure of determining whether an event associated with a UE initiated beam report is triggered will be restarted.
[0103] For example, there are one or two TRPs. A QoS metric is RSRP, and accordingly, a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with a TRP minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is a RSRP difference or delta RSRP or the like.
[0104] During a procedure of determining whether an event associated with a UE initiated beam report is triggered, if any of the (N-1) delta RSRPs associated with any TRP is the first one being larger than or equal to the configured threshold (first time) , the timer associated with the one or multiple TRPs will be started or restarted; and if any of the (N-1) delta RSRPs associated with any TRP is larger than or equal to the configured threshold (every time) , the counter associated with the one or multiple TRPs will be added, e.g., by 1. Before the timer expires, if the counter is larger than or equal to the maximum counter value, an event associated the one configured UE initiated beam report will be triggered.
[0105] The schemes of determining whether an event associated with a UE initiated beam report is triggered will be further illustrated in view of an exemplary scenario of M-DCI based M-TRP as follows.
[0106] In the exemplary scenario of M-DCI based M-TRP, a first MAC CE activates 8 joint or DL TCI states associated with CORESETPoolIndex 0 and a second MAC CE activates 8 joint or DL TCI states associated with CORESETPoolIndex 1. Besides, periodic CSI-RSs 1-8 are associated with 8 activated joint or DL TCI states associated with CORESETPoolIndex 0 and periodic CSI-RSs 9-16 are associated with 8 activated joint or DL TCI states associated with CORESETPoolIndex 1. Besides, CSI-RSs 3 and 10 are associated with the indicated TCI stated associated with CORESETPoolIndex 0 and CORESETPoolIndex 1 respectively. Then, a first delta RSRP which is associated with CORESETPoolIndex 0 is calculated as: a first delta RSRP= (RSRP of a CSI-RS of CSI-RSs 1-2 and 4-8) – (RSRP of CSI-RS 3) ; and a second delta RSRP which is associated with CORESETPooIndex 1 is calculated as: a second delta RSRP = (RSRP of a CSI-RS of CSI-RSs 9 and 11-16) – (RSRP of CSI-RS 10) .
[0107] Then, in accordance with scheme 1-1, if only one UE initiated beam report is configured and any of the first and second delta RSRPs is larger than or equal to a threshold, then the event associated with the UE initiated beam report is triggered. If two UE initiated beam reports, e.g., first and second UE initiated beam reports are configured and are associated with CORESETPoolIndex 0 and CORESETPoolIndex 1 respectively, then the first UE initiated beam report is triggered if the first delta RSRP is larger than or equal to a threshold and / or the second UE initiated beam report is triggered if the second delta RSRP is larger than or equal to a threshold.
[0108] In accordance with scheme 1-2a, a first timer and a first counter, e.g., with an initial value of 0 are associated with CORESETPoolIndex 0. A second timer and a second counter, e.g., with an initial value of 0 are associated with CORESETPoolIndex 1. The same threshold and same maximum counter which is 3 are associated with CORESETPoolIndex 0 and CORESETPoolIndex 1. When only one UE initiated beam report is configured to, an event associated with the only UE initiated beam report is triggered if: there are 3 times that the first delta RSRP is larger than or equal to the threshold (that is, the value of the first counter is 3 which is identical with the maximum counter value) before the first timer expires, or there are 3 times that the second delta RSRP is larger than or equal to the threshold (that is, the value of the second counter is 3 which is identical with the maximum counter value) before the second timer expires. When two UE initiated beam reports are configured to be associated, wherein the first UE initiated beam report is associated with CORESETPoolIndex 0 and the second UE initiated beam report is associated with CORESETPoolIndex 1, the event associated with the first UE initiated beam report is triggered if there are 3 times that the first delta RSRP is larger than or equal to the threshold before the first timer expires or the event associated with the second UE initiated beam report is triggered if there are 3 times that the second delta RSRP is larger than or equal to the threshold before the second timer expires.
[0109] In accordance with scheme 1-2b, one timer, one counter, e.g., with an initial value of 0, one threshold and one maximum counter value, e.g., 3 are configured for the two TRPs, e.g., associated with CORESETPoolIndex 0 and CORESETPoolIndex 1. At first, a first delta RSRP associated with CORESETPoolIndex 0 is larger than or equal to the threshold, and accordingly, the timer starts or restarts, and the counter is updated as 1. Then, when a second delta RSRP associated with CORESETPoolIndex 1 is larger than or equal to the threshold, the counter is updated as 2 if the timer does not expire. Then, when another first delta RSRP associated with CORESETPoolIndex 0 is larger than equal to the threshold, the counter is updated as 3, which is identical with the maximum counter value. Accordingly, an event associated with one configured UE initiated beam report is triggered. Scheme 2: Indication of whether an event associated with a UE initiated beam report is triggered, and UE initiated beam reporting
[0110] After an event associated with a UE initiated beam report is triggered, a related indication may be transmitted to the network side in some cases, to indicate the network side that the event is triggered. For simplification and clearness, such indication is also referred to as an indication of triggering state, wherein an indication indicating a positive trigging state is referred to as an indication of positive triggering state and an indication indicating a negative triggering state is referred to as an indication of negative triggering state. The UE initiated beam report associated with the event will also transmitted to the network side, e.g., a gNB.
[0111] Scheme 2-1
[0112] In accordance with aspects of the present disclosure, a dedicated SR configuration from the network side will configure a dedicated resource, e.g., a SR resource (e.g., a PUCCH resource) used to carry an indication of triggering state, e.g., the indication of positive triggering state. One dedicated SR resource is associated with one event associated with one UE initiated beam report, which is an aperiodic CSI report associated with a dedicated SR resource. Therefore, one dedicated SR resource is configured if only one UE initiated beam report is configured, or multiple, e.g., two dedicated SR resources are configured if multiple, e.g., two UE initiated beam reports are configured (which is per-TRP trigger and report) .
[0113] For example, UE will receive a dedicated SR configuration indicating a dedicated SR resource for transmitting an indication of positive triggering state associated with a UE initiated beam report. Then, UE will transmit an indication of positive triggering state in the dedicated SR resource in the case that an event associated with the UE initiated beam report is triggered.
[0114] After receiving the indication of positive triggering state, the network side, e.g., the gNB will schedule a UL grant DCI to trigger the transmission of UE initiated beam report associated with the triggered event (or associated with the dedicated SR resource) , e.g., in the CSI field. The CSI field will codepoint to aperiodic CSI reports including at least the UE initiated beam report. UE will transmit the UE initiated beam report in the PUSCH triggered by the DCI. While for other normal aperiodic CSI reports, there is no such association.
[0115] A channel measurement resource (CMR) set which is for channel measurement with or without interference measurement resource (IMR) set which is for interference measurement for a UE initiated beam report is configured by RRC as legacy. The related configuration of the aperiodic CSI report associated with a UE initiated beam report will reuse the legacy scheme.
[0116] Furthermore, in some cases, there is a restriction for the RSs in CMR set with or without IMR set that all RSs in the CMR set and IMR set (if any) are aperiodic. It means that UE can only determine the UE initiated beam report after sending an indication of positive triggering state in the dedicated SR resource and receiving an aperiodic CSI-RS after the gNB triggers the transmission of UE initiated beam report, which can further reduce the overhead of the UE initiated beam report.
[0117] Since the UE initiated beam report is transmitted in a PUSCH and must be triggered by a UL grant DCI, at least the dedicated SR resource with an indication of positive triggering state will be multiplexed on a PUSCH if the PUSCH is overlapped with the PUCCH resource of the dedicated SR configuration in time domain. That is, in some cases, an indication of negative triggering state will be transmitted in the dedicated SR resource, which is multiplexed on a PUSCH if the PUSCH is overlapped with the PUCCH resource of the dedicated SR configuration in time domain. However, for a normal SR resource, if it is overlapped with a PUSCH, the normal SR resource will be dropped.
[0118] Scheme 2-2
[0119] In accordance with aspects of the present disclosure, a normal SR resource in a normal SR configuration from the network side will be used to send the indication of triggering state. The UE initiated beam report associated with the triggered event will be transmitted in a MAC CE, which is carried by a PUSCH. In addition, the UE initiated beam report to be transmitted is based on measurements of DL RSs same as or different from the periodic DL RSs for determining whether an event associated with a UE initiated beam report is triggered. A MAC CE for transmitting UE initiated beam report (s) is also referred to as a beam report MAC CE for simplification and clearness.
[0120] In some implementations of the disclosure (scheme 2-2-1) , a UE initiated beam report is measured based on all the periodic DL RSs, e.g., CSI-RSs or SSBs associated with all the non-indicated TCI states for determination whether an event associated with the UE initiated beam report is triggered. Only CMRs are implicitly configured for the UE initiated beam report. That is, the UE initiated beam report to be transmitted is based on measurements of DL RSs same as the periodic DL RSs for determining whether an event associated with a UE initiated beam report is triggered.
[0121] In some cases of the present disclosure (2-2-1a) , M (M>=1) periodic DL RSs, e.g., CSI-RSs or SSBs are reported in the MAC CE carrying the UE initiated beam report, wherein a corresponding QoS metric of the periodic DL RS, e.g., RSRP can be reported together or not. Whether the corresponding RSRP will be included in the UE initiated beam report can be predefined (or fixed) in the specification or configured by RRC. M, e.g., 1 can also be configured by RRC or predefined (or fixed) in the specification.
[0122] Taking S-TRP operations as an example, at most M periodic DL RSs will be reported, where the QoS metric, e.g., RSRP of each of the reported M periodic DL RSs is larger than or equal to the RSRP of a periodic DL RS associated with the indicated joint or DL TCI state plus a threshold configured for the triggering event as described above. At least one RSI, e.g., CRI will be reported due to the triggered event when the beam report MAC CE is transmitted. The at least one RSI is reported as the first RSI (e.g., CRI0) , which may be the CRI with the largest RSRP value if differential RSRP reporting is supported. Considering that the remaining (M-1) periodic DL RSs cannot always be found, an indicator, e.g., using 1 bit will be included in the beam report MAC CE for each of the remaining (M-1) RSIs to indicate whether the corresponding RSI is reported. That is, at most M RSIs associated with the TRP are reported in the beam report MAC CE.
[0123] In an exemplary S-TRP scenario, there are at most 8 activated joint or DL TCI states. Therefore, at most 8 periodic DL RSs are associated with the activated joint or DL TCI states. The reported periodic DL RS will be selected from at most 7 periodic DL RSs because the periodic DL RS associated with the indicated TCI state is excluded. Therefore, the bit width of each RSI is 3 bits. The maximum M will not exceed 7.
[0124] Regarding the RSI, it can be interpreted and / or determined in various manners. For example, in some implementations of the present disclosure, RSI set as 0 means the indicated periodic DL RS associated with an activated joint or DL TCI state with the lowest codepoint in the TCI state activation MAC CE, RSI set as 1 means the indicated periodic DL RS associated with an activated joint or DL TCI state with the second lowest codepoint in the TCI state activation MAC CE, and so on. In some implementations of the present disclosure, RSI set as 0 means the indicated periodic DL RS with the lowest ID (or index) , CRI set as 1 means the indicated periodic DL RS with a second lowest ID (index) , and so on. Considering that the ID (or index) of CSI-RS is independent from that of SSB, only in the case that the periodic DL RSs associated with all activated joint or DL TCI states are the same type, e.g., either CSI-RS or SSB, the later solution can be used.
[0125] For example, it is assumed that a TCI state activation MAC CE activates 8 joint TCI states, and 8 periodic CSI-RSs are determined to be associated with the 8 activated TCI states. The 8 periodic CSI-RSs are CSI-RS 6, CSI-RS 7, CSI-RS 12, CSI-RS 2, CSI-RS 15, CSI-RS 4, CSI-RS 9, and CSI-RS 1, which are associated with the 8 activated TCI states from the lowest codepoint to the highest codepoint. The third activated joint TCI state, with which CSI-RS 12 is associated, is the indicated TCI state for DL transmission indicated by a DCI. In addition, it is assumed that M=1, an event associated a UE initiated beam report is triggered, and CSI-RS 15 is selected for the UE initiated beam report.
[0126] Then, according to the first determination manner of RSI, the CRI in the beam report MAC CE is ‘100, ’ which mean the periodic CSI-RS associated with an activated joint TCI state with the fifth lowest codepoint of the TCI state activation MAC CE. According to the second determination manner of RSI, the CRI in the MAC CE for beam report is ‘111, ’ which means the periodic CSI-RS with the largest index of all periodic CSI-RSs associated with all the activated joint TCI states.
[0127] Figure 2 is an example of a beam report MAC CE for S-TRP in accordance with aspects of the present disclosure.
[0128] As shown in Figure 2, fields in the exemplary beam report MAC CE are interpreted as the following:
[0129] - One Serving Cell ID: This field indicates the identity of the serving cell for which the MAC CE applies. The length of this field is 5 bits;
[0130] - One BWP ID: This field indicates a DL BWP for which the MAC CE applies as the codepoint of the DCI bandwidth part indicator field as specified in 3GPP TS 38.212. The length of the BWP ID field is 2 bits;
[0131] - Ci: This field is an indicator field, which indicates whether CRIi (i=1, …, M-1) is reported. The length of this field is 1 bit where “0” means CRIi is not reported where the field of CRIi and RSRPi should be ignored and “1” means CRIi is reported.
[0132] - CRIi (i=0, 1, …, M-1) : This field indicates the ith reported periodic CSI-RS or SSB associated with an activated joint or DL TCI state except for the applicable joint or DL TCI state of the BWP ID of the Serving Cell ID. And the length of the CRIi field is 3 bits;
[0133] - RSRPi (i=0, 1, …, M-1) : This field indicates the corresponding RSRP of the periodic CSI-RS or SSB indicated by the CRIi. And the length of the RSRP field is 7 bits.
[0134] - R: Reserved bit.
[0135] Although RSRPi in Figure 2 has a length 7bits, only the length of the first RSRP, e.g., RSRP0 (e.g., the RSRP measured by CSI-RS 15 in the above example) is always 7 bits. In some implementations of the present disclosure, the length of other RSRPs (RSRP1~RSRPM-1) may be 7bits if differential reporting is not used, or 4 bits if differential reporting is used.
[0136] Scheme 2-2-1a can also be applied for M-TRP operations. There will be multiple beam report MAC CEs, each beam report MAC CE is associated with a UE initiated beam report associated with a TRP of multiple TRPs. Compared with the beam report MAC CE for S-TRP operations, each beam report MAC CE for a TRP in M-TRP operations will further include a field for indicating with which TRP the UE initiated beam report in the beam report MAC CE is associated, which can be achieved by adjusting a 'R' field in the MAC CE beam report MAC CE for S-TRP operations.
[0137] In some other cases of the present disclosure (2-2-1b) , 2*M (M>=1) periodic DL RSs are reported in the beam report MAC CE, wherein a corresponding QoS metric of the periodic DL RS, e.g., RSRP can be reported together or not. Similarly, whether the corresponding RSRP will be included in the UE initiated beam report can be predefined (fixed) in the specification or configured by RRC. M, e.g., 1 can also be configured by RRC or predefined (fixed) in the specification.
[0138] Taking M-TRP operations as an example, at most 2*M DL RSs, e.g., CSI-RSs or SSBs are reported in a beam report MAC CE, where at most M periodic DL RSs are reported per TRP. For each reported periodic DL RS associated with one TRP, its RSRP is larger than or equal to the RSRP of a periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP plus a threshold configured for the triggered event as described above. At least one RSI, e.g., CRI will be reported in the beam report MAC CE in view of the triggered event when the beam report MAC CE is transmitted. Similar to scheme 2-2-1a, an indicator, e.g., 1 bit for each of 2*M RSIs will be in the beam report MAC CE to indicate whether the corresponding RSI is reported. At most 2*M, M>=1, RSRPs associated with the one or two TRPs are reported in the beam report MAC CE. In some other cases, for overhead reduction, differential RSRP reporting will be used, wherein an absolute RSRP report is for the first RSI and differential RSRP report for the remaining RSIs, and then 1 bit can be used to indicate with which TRP the first RSI whose RSRP value is the largest is associated. That is, there are at least (2*M-1) indicator fields in the MAC CE, and each indicator indicates whether a corresponding RSI is reported by 1 bit.
[0139] In an exemplary M-TRP scenario, there are at most 16 activated joint or DL TCI states, wherein, there are at most 8 activated joint or DL TCI states per TRP. Therefore, at most 16 periodic DL RS are determined to be associated with all the 16 activated joint or DL TCI states, wherein there are at most 8 activated joint or DL TCI states per TRP. Each of the reported periodic DL RS is selected from at most 14 periodic DL RSs associated with all the non-indicated joint or DL TCI states associated with two TRPs or from at most 7 periodic DL RSs associated with the non-indicated TCI states associated with the same TRP. The bit width of a RSI field is 4 bits if sorting of RSI is performed for the two TRPs, or the bit width of a RSI field is 3 bits if sorting of CRI is performed per TRP.
[0140] Figure 3 is an example of a beam report MAC CE for M-TRP in accordance with aspects of the present disclosure.
[0141] As shown in Figure 3, fields in the exemplary beam report MAC CE are interpreted as the following:
[0142] - Serving Cell ID: This field indicates the identity of the serving cell for which the MAC CE applies. The length of the field is 5 bits;
[0143] - BWP ID: This field indicates a DL BWP for which the MAC CE applies as the codepoint of the DCI bandwidth part indicator field as specified in 3GPP TS 38.212. The length of the BWP ID field is 2 bits.
[0144] - C2i+j (i=0, 1, …, M-1, j= 0, 1) : This field indicates whether CRI2i+j is reported. The length of this field is 1 bit where “0” means CRI2i+j is not reported and the fields of CRI2i+j and its corresponding RSRP2i+j will be ignored and “1” means C2i+j is reported.
[0145] - CRI2i+j (i=0, 1, …, M-1, j= 0, 1) : This field indicates a (i+1) th reported periodic CSI-RS or SSB associated with activated joint or DL TCI states except for the applicable joint or DL TCI state associated with the (j+1) th TRP of the BWP ID of the Serving Cell ID. The length of the CRI field is 3 bits in this example, and in some other examples, 4 bits can work too.
[0146] - RSRP2i+j (i=0, 1, …, M-1, j= 0, 1) : This field indicates the corresponding RSRP of the periodic CSI-RS or SSB indicated by the CRI2i+j. The length of this field is 7 bits.
[0147] - R: Reserved bit.
[0148] Similarly, regarding the RSI, it can be interpreted and / or determined in various manners.
[0149] For example, in some implementations of the present disclosure, the bit width of a RSI field is 3 bits. For a RSI associated with the first TRP, it is set as 0 means the indicated periodic DL RS associated with an activated joint or DL TCI state with the lowest codepoint of all activated joint or DL TCI states associated with the first TRP in the TCI state activation MAC CE, RSI set as 1 means the indicated periodic DL RS associated with an activated joint or DL TCI state with the second lowest codepoint of all activated joint or DL TCI states associated with the first TRP in the TCI state activation MAC CE, and so on. Similarly, for a RSI associated with the second TRP, it is set as 0 means the indicated periodic DL RS associated with an activated joint or DL TCI state with the lowest codepoint of all activated joint or DL TCI states associated with the second TRP in the TCI state activation MAC CE, RSI set as 1 means the indicated periodic DL RS associated with an activated joint or DL TCI state with the second lowest codepoint of all activated joint or DL TCI states associated with the second TRP in the TCI state activation MAC CE, and so on.
[0150] In some other implementations of the present disclosure, the bit width of a RSI field is also 3 bits. For a RSI associated with the first TRP, it is set as 0 means the indicated periodic DL RS with the lowest ID (or index) of all periodic DL RSs associated with all the activated joint or DL TCI states associated with the first TRP, RSI set as 1 means the indicated periodic DL RS with the second lowest ID (or index) of all periodic DL RSs associated with all the activated joint or DL TCI states associated with the first TRP and so on. Similarly, for a RSI associated with the second TRP, it is set as 0 means the indicated periodic DL RS with a lowest ID (index) of all periodic DL RSs associated with all the activated joint or DL TCI states associated with the second TRP, RSI set as 1 means the indicated periodic DL RSs with a second lowest ID (index) of all periodic DL RSs associated with all the activated joint or DL TCI states associated with the second TRP and so on. Similarly, considering that the ID (index) of CSI-RS is independent from that of SSB, only in the case that the periodic DL RSs associated with all activated joint or DL TCI states are the same type, e.g., either CSI-RS or SSB, this solution can be used.
[0151] In some yet other implementations of the present disclosure, the bit width of a RSI field is 4 bits. For a RSI associated with the first TRP, it is set as 0 means the indicated periodic DL RS with the lowest ID (or index) of all periodic DL RSs associated with all the activated joint or DL TCI states of the two TRPs, RSI set as 1 means the indicated periodic DL RS with the second lowest ID (or index) of all periodic DL RSs associated with all the activated joint or DL TCI states of the two TRPs and so on. For a RSI associated with the second TRP, it is set as 0 means the indicated periodic DL RS with the lowest ID (or index) of all periodic DL RSs associated with all the activated joint or DL TCI states of the two TRPs, RSI set as 1 means the indicated periodic DL RS with the second lowest ID (or index) of all periodic DL RSs associated with all the activated joint or DL TCI states of the two TRPs and so on. The values of two reported RSI will not be the same because the UE will report two different periodic DL RSs for two TRPs. Similarly, only in the case that the periodic DL RSs associated with all activated joint or DL TCI states are the same type, e.g., either CSI-RS or SSB, this solution can be used.
[0152] For example, in an exemplary M-DCI based M-TRP scenario, 8 joint TCI states are activated by a first TCI state activation MAC CE to be associated with CORESETPoolIndex 0, and 8 periodic CSI-RSs, e.g., CSI-RSs 1-8 are determined to be associated with the 8 activated joint TCI states from the lowest codepoint to the highest codepoint of the first TCI state activation MAC CE. CSI-RS 3 is the periodic RS associated with the indicated joint TCI state associated with CORESETPoolIndex 0. Besides, 8 joint TCI states are activated by a second TCI state activation MAC CE to be associated with CORESETPoolIndex 1 and 8 periodic CSI-RSs, e.g., CSI-RSs 16-9 are determined to be associated with the 8 activated joint TCI states from the lowest codepoint to the highest codepoint of the second TCI state activation MAC CE. CSI-RS 12 is the periodic RS associated with the indicated joint TCI state associated with CORESETPoolIndex 1.
[0153] It is assumed that M is 1, and CSI-RS 5 and its corresponding RSRP is determined to be reported in the beam report MAC CE for the first TRP which is associated with CORESETPoolIndex 0 and CSI-RS 10 and its corresponding RSRP is determined to be reported to in the beam report MAC CE for the second TRP which is associated with CORESETPoolIndex 1. C0 in the beam report MAC CE and C1 in the beam report MAC CE are both determined as 1, that is, CSI-RS 5 and CSI-RS 10 will be reported.
[0154] Then, according to the first determination manner of RSI, CRI0 is ‘100’ and CRI1 is ‘110’ . According to the second determination manner of RSI, CRI0 is ‘100’ and CRI1 is ‘001. ’ According to the third determination manner of RSI, CRI0 is ‘0100’ and CRI1 is ‘1001. ’
[0155] Although the scheme 2-2-1b is illustrated in view of M-TRP, it is also applicable for S-TRP with same the beam report MAC CE designed for M-TRP. A reserved bit can be used to indicate whether the beam report MAC CE is for S-TRP or M-TRP, and then the corresponding fields can be interpreted accordingly.
[0156] In some other implementations of the disclosure (scheme 2-2-2) , the UE initiated beam report in the MAC CE is based on the measurements of DL RSs different from those for determining whether an event associated with a UE initiated beam report is triggered. That is, the UE initiated beam report is not related to the DL RSs for triggering state determination, and a dedicated CMR set with / without IMR set will be configured for the UE initiated beam report. The UE initiated beam report is a CSI report configured with a new type different from ‘periodic’ , ‘semi-persistent’ and ‘aperiodic. ’ The new type can be configured by RRC as ‘UE initiated’ or ‘UE triggered. ’ With the RRC configuration of type, UE will know the association between the UE initiated beam report and the event. Other configuration (s) of the UE initiated report is the same as a normal CSI report configuration. However, there is a restriction for the RSs in the CMR set and IMR set if they are configured for the UE initiated beam report, which is: the RSs in the CMR set or IMR set if any, configured for the UE initiated beam report should be periodic, or either periodic or semi-persistent. That is, the DL RSs for the UE initiated beam report are configured to be all periodic, or to be either periodic or semi-persistent.
[0157] The content of the UE initiated beam report is the same as that of an aperiodic CSI report configured for L1-RSRP or L1-SINR report. The difference is that the CSI content of the UE initiated beam report is transmitted by a MAC CE carried by a PUSCH where the content is only aware by MAC layer, while the CSI content of the aperiodic CSI report is transmitted by a PUSCH where the content is aware by physical layer.
[0158] In some yet other implementations of the disclosure (scheme 2-2-3) , the UE initiated beam report in the MAC CE is also not related to the DL RSs for triggering state determination, while is based on the measurements of a set of periodic DL RSs configured separately from the RSs for determining whether the event associated with the UE initiated beam report is triggered. The set of periodic DL RSs, e.g., SSBs or CSI-RSs are configured by RRC for a UE initiated beam report. M (M>=1) RSIs, each indicating one periodic DL RS of the set of periodic DL RSs and the corresponding RSRP values are reported in the UE initiated beam report by a MAC CE. Similarly, M, e.g., 1 can be configured by RRC or predefined (fixed) in the specification. Whether the corresponding RSRP values are reported can also be configured or predefined.
[0159] If one UE initiated beam report is configured, then only one DL RS set is configured. If multiple, e.g., two UE initiated beam reports are configured, wherein each UE initiated beam report is associated with a corresponding TRP, then two DL RS sets are configured to be associated with two TRPs.
[0160] In some implementations of the present disclosure, a DL RS set for a UE initiated beam report is a candidate resource set configured for beam failure recovery. If cell-specific BFR request (BFRQ) is configured where only one candidate resource set is configured, then only one UE initiated beam report is configured and the candidate resource set is used for beam management for the UE initiated beam report. If TRP-specific BFRQ is configured where two candidate resource sets are configured, then two UE initiated beam reports are configured and a candidate resource set associated with a corresponding TRP is used for beam management for a UE initiated beam report associated with the TRP.
[0161] Design of the beam report MAC CE design in scheme 2-2-3 is similar to the beam report MAC CE design for S-TRP in scheme 2-2-1a. For example, there are M, M>=1 RSI fields and M QoS metric fields in the MAC CE, and each QoS metric corresponds to a reported RSI. The bit width of a RSI field is determined by the number of the DL RS set configured for the UE initiated beam report. However, there is no need to indicate whether RSIi (i=1~M-1) is reported. The bit width of a QoS metric field, e.g., RSRP field is 7 bits or 4bits, wherein a length of a first QoS metric field is always 7 bits while a length of other QoS metric fields is 7 bits or 4 bits. For example, if differential reporting is supported for QoS metric values, then the first RSI always has the largest QoS metric value, and the remaining (M-1) QoS metric values are differential QoS metric values with reference to the largest QoS metric value. In the UE initiated beam report, the RSI, e.g., CRI selection is up to UE, which is same as R15 L1-RSRP report.
[0162] Figure 4 illustrates an example of a UE 400 in accordance with aspects of the present disclosure. The UE 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 disclosure as described herein. These components may be coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces.
[0163] 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 disclosure.
[0164] 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 UE 400 to perform various functions of the present disclosure.
[0165] 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 UE 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.
[0166] In some implementations, the processor 402 and the memory 404 coupled with the processor 402 may be configured to cause the UE 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 UE 400 in accordance with examples as disclosed herein. The UE 400 may be configured to support a means for supporting beam reporting. The UE 400 is configured to receive information indicating periodic DL RSs associated with all activated joint or DL TCI states of an BWP of a serving cell; determine whether an event associated with a UE initiated beam report is triggered based on measurements of the periodic DL RSs; and transmit the UE initiated beam report in a PUSCH in the case that the event associated with the UE initiated beam report is triggered.
[0167] In some implementations, there are N, N>=2, activated joint or DL TCI states associated with each transmit-receive point (TRP) of one or multiple TRPs in the activated BWP of the serving cell, including an indicated joint or DL TCI state and (N-1) non-indicated joint or DL TCI states other than the indicated joint or DL TCI state, wherein, the indicated joint or DL TCI state is a joint or DL TCI state indicated to be applicable from a time instance in the BWP for the TRP, N is same or different for different TRPs, and the at least one processor is configured to cause the UE to: in the case that multiple UE initiated beam reports are configured for multiple TRPs, wherein each UE initiated beam report is associated with a corresponding TRP of the multiple TRPs, determine an event associated with a UE initiated beam report associated with a TRP is triggered in the case that a result of a quality of service (QoS) metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with the TRP minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to a threshold; and in the case that one UE initiated beam report is configured for the one or multiple TRPs, determine an event associated with the one UE initiated beam report is triggered in the case that a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with a TRP of the one or multiple TRPs minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to a threshold.
[0168] In some implementations, the at least one processor is configured to cause the UE to: determine an event associated with a UE initiated beam report is triggered in the case that a value of a counter associated with the event is larger than or equal to a maximum counter value associated with the event before a timer associated with the event expiries.
[0169] In some implementations, there is one or multiple TRPs in the serving cell, and there are N, N>=2, activated joint or DL TCI states associated with each TRP of the one or multiple TRPs, including an indicated joint or DL TCI state associated with the TRP and (N-1) non-indicated joint or DL TCI states associated with the TRP other than the indicated joint or DL TCI state associated with the TRP, wherein, the indicated joint or DL TCI state associated with the TRP is a joint or DL TCI state indicated to be applicable from a time instance in the BWP for the TRP, N is same or different for different TRPs, and wherein, the counter, the maximum counter value, the timer, and a threshold associated with an event are configured for each of the one or multiple TRPs, and in response to starting a procedure of determining whether an event associated with a UE initiated beam report is triggered, the at least one processor is configured to cause the UE to: increase the value of the counter associated with a TRP by 1 in the case that a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with the TRP minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to a threshold associated with the TRP; and start or restart the timer associated with the TRP in response to a first determination of a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with the TRP minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to the threshold.
[0170] In some implementations, in the case that the corresponding periodic DL RS of the indicated joint or DL TCI states associated with the TRP changes, the at least one processor is configured to cause the UE to reset the value of the counter associated with the TRP to an initial value.
[0171] In some implementations, in the case that one UE initiated beam report is configured for the one or multiple TRPs, the at least one processor is configured to cause the UE to: determine whether the event associated with the one UE initiated beam report is triggered according to the counter associated with any TRP of the one or more TRPs; and in the case that multiple UE initiated beam reports are configured for multiple TRPs, wherein each UE initiated beam report is associated with a corresponding TRP of the multiple TRPs, the at least one processor is configured to cause the UE to: determine whether an event associated with a UE initiated beam report associated with a TRP of the multiple TRPs is triggered according to the counter associated with the TRP.
[0172] In some implementations, there is one or multiple TRPs in the serving cell, and there are N, N>=2, activated joint or DL TCI states associated with each TRP of the one or multiple TRPs, including an indicated joint or DL TCI state associated with the TRP and (N-1) non-indicated joint or DL TCI states associated with the TRP other than the indicated joint or DL TCI state associated with the TRP, wherein, the indicated joint or DL TCI state associated with the TRP is a joint or DL TCI state indicated to be applicable from a time instance in the BWP for the TRP, N is same or different for different TRPs, and wherein, the counter, the maximum counter value, the timer, and a threshold associated with an event are configured for all of the one or multiple TRPs, and in response to starting a procedure of determining whether an event associated with a UE initiated beam report is triggered, the at least one processor is configured to cause the UE to: increase the value of the counter by 1 in the case that a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with a TRP of the one or multiple TRPs in the serving cell minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to a threshold; and start or restart the timer in response to a first determination in the serving cell of a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with a TRP of the one or multiple TRPs in the serving cell minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to the threshold.
[0173] In some implementations, in the case that a corresponding periodic DL RS of the indicated joint or DL TCI states associated with a TRP in the serving cell changes, the at least one processor is configured to cause the UE to reset the value of the counter to an initial value.
[0174] In some implementations, one UE initiated beam report is configured by network side, and the at least one processor is configured to cause the UE to: determine whether the event associated with the one UE initiated beam report is triggered according to the counter.
[0175] In some implementations, the at least one processor is configured to cause the UE to: receive a prohibit timer associated with determining whether an event associated with a UE initiated beam report is triggered; and determine whether an event associated with a UE initiated beam report is triggered based on measurements of the periodic DL RSs after the prohibit timer expiries.
[0176] In some implementations, the at least one processor is configured to cause the UE to: receive dedicated SR configuration indicating a dedicated SR resource for transmitting an indication of event associated with UE initiated beam report being triggered, wherein, the UE initiated beam report is an aperiodic channel state information (CSI) report associated with the dedicated SR resource.
[0177] In some implementations, the at least one processor is configured to cause the UE to: transmit an indication of event associated with UE initiated beam report being triggered in the dedicated SR resource; and receive uplink grant DL control information (DCI) to trigger transmission of the UE initiated beam report associated with the dedicated SR request resource.
[0178] In some implementations, the indication of event associated with UE initiated beam report being triggered transmitted in the dedicated SR resource is multiplexed in a PUSCH in the case that the dedicated SR resource is overlapped with the PUSCH in time domain.
[0179] In some implementations, the at least one processor is configured to cause the UE to: transmit an indication of event associated with UE initiated beam report not being triggered in the dedicated SR resource, wherein, the indication of event associated with UE initiated beam report not being triggered transmitted in the dedicated SR resource is multiplexed in a PUSCH in the case that the dedicated SR resource is overlapped with the PUSCH in time domain.
[0180] In some implementations, the at least one processor is configured to cause the UE to: transmit a UE initiated beam report in the case that the event associated with the UE initiated beam report is triggered in a media access control (MAC) control element (CE) in the PUSCH based on measurements of DL RSs same as or different from the periodic DL RSs for determining whether an event associated with a UE initiated beam report is triggered.
[0181] In some implementations, there is one or multiple TRPs in the serving cell, and there are N, N>=2, activated joint or DL TCI states associated with each TRP of the one or more TRPs, including an indicated joint or DL TCI state associated with the TRP and (N-1) non-indicated joint or DL TCI states associated with the TRP other than the indicated joint or DL TCI state associated with the TRP, wherein, the indicated joint or DL TCI state associated with the TRP is a joint or DL TCI state indicated to be applicable from a time instance in the BWP for the TRP, N is same or different for different TRPs, and wherein, the UE initiated beam report in the MAC CE is based on the measurements of DL RSs in a TRP and the DL RSs are same as the periodic DL RSs for determining whether the event associated with the UE initiated beam report is triggered, and wherein, at most M, M>=1, reference resource indicators (RSIs) associated with the TRP are reported in the MAC CE, wherein a differential QoS metric of a DL RS corresponding to a RSI of the at most M RSIs is larger than or equal to a threshold for determining whether the event associated with the UE initiated beam report is triggered, and each differential QoS metric of the DL RS is a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with the TRP minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP.
[0182] In some implementations, there are (M-1) indicator fields in the MAC CE, and each indicator indicates whether a corresponding RSI of M RSIs corresponding to the DL RSs except for a first RSI is reported by 1 bit.
[0183] In some implementations, there are M RSI fields in the MAC CE, and the length of the RSI field is 3 bits.
[0184] In some implementations, RSI set as 0 means a periodic DL RS associated with an activated joint or DL TCI state with a lowest codepoint in a TCI state activation MAC CE associated with the TRP, RSI set as 1 means a periodic DL RS associated with an activated joint or DL TCI state with a second lowest codepoint in the TCI state activation MAC CE associated with the TRP, and so on.
[0185] In some implementations, RSI set as 0 means a periodic DL RS associated with a lowest index of all periodic DL RSs associated with all the activated joint or DL TCI states associated with the TRP, RSI set as 1 means a RS with a second lowest index of all periodic DL RSs associated with all the activated joint or DL TCI states associated with the TRP, and so on.
[0186] In some implementations, there are at most M QoS metric fields in the MAC CE, and each QoS metric is corresponding to a reported RSI, wherein a length of a first QoS metric field is always 7 bits while a length of other QoS metric fields is 7 bits or 4 bits.
[0187] In some implementations, there are multiple TRPs in the serving cell, and each MAC CE includes a field for indicating with which TRP the UE initiated beam report in the MAC CE is associated.
[0188] In some implementations, there is one or two TRPs in the serving cell, and there are N, N>=2, activated joint or DL TCI states associated with each TRP of the one or two TRPs, including an indicated joint or DL TCI state associated with the TRP and (N-1) non-indicated joint or DL TCI states associated with the TRP other than the indicated joint or DL TCI state associated with the TRP, wherein, the indicated joint or DL TCI state associated with TRP is a joint or DL TCI state indicated to be applicable from a time instance in the BWP for the TRP, N is same or different for different TRPs, and wherein, the UE initiated beam report in the MAC CE is based on the measurements of DL RSs in each TRP and the DL RSs are same as the periodic DL RSs for determining whether the event associated with the UE initiated beam report is triggered, and wherein, at most 2*M, M>=1, RSIs associated with the one or two TRPs are reported in the MAC CE, wherein a differential QoS metric of a DL RS corresponding to RSI of the at most 2*M RSIs is larger than or equal to a threshold for determining whether the event associated with the UE initiated beam report is triggered, and each differential QoS metric of the DL RS is a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with a corresponding TRP minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the corresponding TRP.
[0189] In some implementations, there are at least (2*M-1) indicator fields in the MAC CE, and each indicator indicates whether a corresponding RSI is reported by 1 bit.
[0190] In some implementations, there are 2*M RSI fields in the MAC CE, the length of the RSI field is 3 bits, and for each TRP of the one or two TRPs, RSI set as 0 means a periodic DL RS associated with an activated joint or DL TCI state with a lowest codepoint of all activated joint or DL TCI states associated with the TRP in a TCI state activation MAC CE, RSI set as 1 means a periodic DL RS associated with an activated joint or DL TCI state with a second lowest codepoint of all activated joint or DL TCI states associated with the TRP in the TCI state activation MAC CE, and so on.
[0191] In some implementations, there are 2*M RSI fields in the MAC CE, the length of the RSI field is 3 bits, and for each TRP of the one or two TRPs, RSI set as 0 means a periodic DL RS associated with a lowest index of all periodic DL RSs associated with all the activated joint or DL TCI states associated with the TRP, RSI set as 1 means a periodic DL RS with a second lowest index of all periodic DL RSs associated with all the activated joint or DL TCI states associated with the TRP, and so on.
[0192] In some implementations, there are 2*M RSI fields in the MAC CE, the length of the RSI field is 4 bits, and for each TRP of the one or two TRPs, RSI set as 0 means a periodic DL RS associated with a lowest index of all periodic DL RSs associated with all the activated joint or DL TCI states associated with the two TRPs, RSI set as 1 means a periodic DL RS with a second lowest index of all periodic DL RSs associated with all the activated joint or DL TCI states associated with the two TRPs, and so on.
[0193] In some implementations, there are at most 2*M QoS metric fields in the MAC CE, and each QoS metric is corresponding to a reported RSI, wherein a length of a QoS metric field is 7 bits or 4 bits.
[0194] In some implementations, the UE initiated beam report in the MAC CE is based on the measurements of DL RSs different from the periodic DL RSs for determining whether the event associated with the UE initiated beam report is triggered, wherein the UE initiated beam report is a CSI report configured with a type different from ‘periodic’ , ‘semi-persistent’ and ‘aperiodic. ’
[0195] In some implementations, the DL RSs for the UE initiated beam report are configured to be all periodic, or to be either periodic or semi-persistent.
[0196] In some implementations, the UE initiated beam report in the MAC CE is based on the measurements of a set of periodic DL RSs configured separately from the RSs for determining whether the event associated with the UE initiated beam report is triggered, wherein there are M, M>=1 reference resource indicator (RSI) fields in the MAC CE, M RSIs indicates M periodic DL RSs from the set of periodic DL RSs and a length of each RSI field is determined by a number of the DL RS set configured for the UE initiated beam report.
[0197] In some implementations, there are M QoS metric fields in the MAC CE, and each QoS metric corresponds to a reported RSI, wherein a length of a first QoS metric field is always 7 bits while a length of other QoS metric fields is 7 bits or 4 bits.
[0198] The controller 406 may manage input and output signals for the UE 400. The controller 406 may also manage peripherals not integrated into the UE 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.
[0199] In some implementations, the UE 400 may include at least one transceiver 408. In some other implementations, the UE 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.
[0200] 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.
[0201] 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.
[0202] Figure 5 illustrates an example of a processor 500 in accordance with aspects of the present disclosure. The processor 500 may be an example of a processor configured to perform various operations in accordance with examples as described herein. The processor 500 may include a controller 502 configured to perform various operations in accordance with examples as described herein. The processor 500 may optionally include at least one memory 504, which may be, for example, an L1 / L2 / L3 cache. Additionally, or alternatively, the processor 500 may optionally include one or more arithmetic-logic units (ALUs) 506. 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) .
[0203] The processor 500 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 500) 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) .
[0204] The controller 502 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 500 to cause the processor 500 to support various operations in accordance with examples as described herein. For example, the controller 502 may operate as a control unit of the processor 500, generating control signals that manage the operation of various components of the processor 500. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.
[0205] The controller 502 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 504 and determine subsequent instruction (s) to be executed to cause the processor 500 to support various operations in accordance with examples as described herein. The controller 502 may be configured to track memory address of instructions associated with the memory 504. The controller 502 may be configured to decode instructions to determine the operation to be performed and the operands involved. For example, the controller 502 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 500 to cause the processor 500 to support various operations in accordance with examples as described herein. Additionally, or alternatively, the controller 502 may be configured to manage flow of data within the processor 500. The controller 502 may be configured to control transfer of data between registers, arithmetic logic units (ALUs) , and other functional units of the processor 500.
[0206] The memory 504 may include one or more caches (e.g., memory local to or included in the processor 500 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementations, the memory 504 may reside within or on a processor chipset (e.g., local to the processor 500) . In some other implementations, the memory 504 may reside external to the processor chipset (e.g., remote to the processor 500) .
[0207] The memory 504 may store computer-readable, computer-executable code including instructions that, when executed by the processor 500, cause the processor 500 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. The controller 502 and / or the processor 500 may be configured to execute computer-readable instructions stored in the memory 504 to cause the processor 500 to perform various functions. For example, the processor 500 and / or the controller 502 may be coupled with or to the memory 504, the processor 500, the controller 502, and the memory 504 may be configured to perform various functions described herein. In some examples, the processor 500 may include multiple processors and the memory 504 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.
[0208] The one or more ALUs 506 may be configured to support various operations in accordance with examples as described herein. In some implementations, the one or more ALUs 506 may reside within or on a processor chipset (e.g., the processor 500) . In some other implementations, the one or more ALUs 506 may reside external to the processor chipset (e.g., the processor 500) . One or more ALUs 506 may perform one or more computations such as addition, subtraction, multiplication, and division on data. For example, one or more ALUs 506 may receive input operands and an operation code, which determines an operation to be executed. One or more ALUs 506 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 506 may support logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 506 to handle conditional operations, comparisons, and bitwise operations.
[0209] The processor 500 may support wireless communication in accordance with examples as disclosed herein. The processor 500 may be configured to or operable to support a means for beam reporting. The processor is configured to receive information indicating periodic DL RSs associated with all activated joint or DL TCI states of an BWP of a serving cell; determine whether an event associated with a UE initiated beam report is triggered based on measurements of the periodic DL RSs; and transmit the UE initiated beam report in a PUSCH in the case that the event associated with the UE initiated beam report is triggered.
[0210] Figure 6 illustrates an example of a NE 600 in accordance with aspects of the present disclosure. The NE 600 may include a processor 602, a memory 604, a controller 606, and a transceiver 608. The processor 602, the memory 604, the controller 606, or the transceiver 608, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. These components may be coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces.
[0211] The processor 602, the memory 604, the controller 606, or the transceiver 608, 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 disclosure.
[0212] The processor 602 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 602 may be configured to operate the memory 604. In some other implementations, the memory 604 may be integrated into the processor 602. The processor 602 may be configured to execute computer-readable instructions stored in the memory 604 to cause the NE 600 to perform various functions of the present disclosure.
[0213] The memory 604 may include volatile or non-volatile memory. The memory 604 may store computer-readable, computer-executable code including instructions when executed by the processor 602 cause the NE 600 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such the memory 604 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.
[0214] In some implementations, the processor 602 and the memory 604 coupled with the processor 602 may be configured to cause the NE 600 to perform one or more of the functions described herein (e.g., executing, by the processor 602, instructions stored in the memory 604) . For example, the processor 602 may support wireless communication at the NE 600 in accordance with examples as disclosed herein. The NE 600 may be configured to support a means for beam reporting. The NE 600 is configured to transmit information indicating periodic DL RSs associated with all activated joint or DL TCI states of an activated BWP of a serving cell, so that whether an event associated with a UE initiated beam report is triggered will be determined based on measurements of the periodic DL RSs in UE; and receive a UE initiated beam report in a PUSCH in the case that the event associated with the UE initiated beam report is triggered.
[0215] The controller 606 may manage input and output signals for the NE 600. The controller 606 may also manage peripherals not integrated into the NE 600. In some implementations, the controller 606 may utilize an operating system such as or other operating systems. In some implementations, the controller 606 may be implemented as part of the processor 602.
[0216] In some implementations, the NE 600 may include at least one transceiver 608. In some other implementations, the NE 600 may have more than one transceiver 608. The transceiver 608 may represent a wireless transceiver. The transceiver 608 may include one or more receiver chains 610, one or more transmitter chains 612, or a combination thereof.
[0217] A receiver chain 610 may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receiver chain 610 may include one or more antennas for receive the signal over the air or wireless medium. The receiver chain 610 may include at least one amplifier (e.g., a low-noise amplifier (LNA) ) configured to amplify the received signal. The receiver chain 610 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 610 may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.
[0218] A transmitter chain 612 may be configured to generate and transmit signals (e.g., control information, data, packets) . The transmitter chain 612 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 612 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 612 may also include one or more antennas for transmitting the amplified signal into the air or wireless medium.
[0219] Figure 7 illustrates a flowchart of a method in accordance with aspects of the present disclosure. 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.
[0220] At step 701, the method may include receiving information indicating periodic DL RSs associated with all activated joint or DL TCI states of an activated BWP of a serving cell. The operations of step 701 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of step 701 may be performed by a UE as described with reference to Figure 4.
[0221] At step 703, the method may include determining whether an event associated with a UE initiated beam report is triggered based on measurements of the periodic DL RSs. The operations of step 703 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of step 703 may be performed by a UE as described with reference to Figure 4.
[0222] At step 705, the method may include transmitting the UE initiated beam report in a PUSCH in the case that the event associated with the UE initiated beam report is triggered. The operations of step 705 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of step 705 may be performed a UE as described with reference to Figure 4.
[0223] It should be noted that the method described herein describes a possible implementation, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible.
[0224] Figure 8 illustrates a flowchart of a method in accordance with aspects of the present disclosure. The operations of the method may be implemented by a NE as described herein. In some implementations, the NE may execute a set of instructions to control the function elements of the NE to perform the described functions.
[0225] At step 801, the method may include transmit information indicating periodic DL RSs associated with all activated joint or DL TCI states of an activated BWP of a serving cell, so that whether an event associated with a UE initiated beam report is triggered will be determined based on measurements of the periodic DL RSs in UE. The operations of step 801 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of step 801 may be performed by a NE as described with reference to Figure 6.
[0226] At step 803, the method may include receive a UE initiated beam report in a PUSCH in the case that the event associated with the UE initiated beam report is triggered. The operations of step 803 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of step 803 may be performed by a NE as described with reference to Figure 6.
[0227] It should be noted that the method described herein describes a possible implementation, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible.
[0228] The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure 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 disclosure. Thus, the disclosure 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) for wireless communication, comprising:at least one memory; andat least one processor coupled with the at least one memory and configured to cause the UE to:receive information indicating periodic downlink (DL) reference signals (RSs) associated with all activated joint or DL transmission configuration indication (TCI) states of an activated bandwidth part (BWP) of a serving cell;determine whether an event associated with a UE initiated beam report is triggered based on measurements of the periodic DL RSs; andtransmit the UE initiated beam report in a physical uplink shared channel (PUSCH) in the case that the event associated with the UE initiated beam report is triggered.2.The UE of claim 1, wherein, there are N, N>=2, activated joint or DL TCI states associated with each transmit-receive point (TRP) of one or multiple TRPs in the activated BWP of the serving cell, including an indicated joint or DL TCI state and (N-1) non-indicated joint or DL TCI states other than the indicated joint or DL TCI state, wherein, the indicated joint or DL TCI state is a joint or DL TCI state indicated to be applicable from a time instance in the BWP for the TRP, N is same or different for different TRPs, and the at least one processor is configured to cause the UE to:in the case that multiple UE initiated beam reports are configured for multiple TRPs, wherein each UE initiated beam report is associated with a corresponding TRP of the multiple TRPs,determine an event associated with a UE initiated beam report associated with a TRP is triggered in the case that a result of a quality of service (QoS) metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with the TRP minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to a threshold; andin the case that one UE initiated beam report is configured for the one or multiple TRPs,determine an event associated with the one UE initiated beam report is triggered in the case that a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with a TRP of the one or multiple TRPs minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to a threshold.3.The UE of claim 1, wherein, the at least one processor is configured to cause the UE to:determine an event associated with a UE initiated beam report is triggered in the case that a value of a counter associated with the event is larger than or equal to a maximum counter value associated with the event before a timer associated with the event expiries.4.The UE of claim 3, wherein, there is one or multiple transmit-receive points (TRPs) in the serving cell, and there are N, N>=2, activated joint or DL TCI states associated with each TRP of the one or multiple TRPs, including an indicated joint or DL TCI state associated with the TRP and (N-1) non-indicated joint or DL TCI states associated with the TRP other than the indicated joint or DL TCI state associated with the TRP, wherein, the indicated joint or DL TCI state associated with the TRP is a joint or DL TCI state indicated to be applicable from a time instance in the BWP for the TRP, N is same or different for different TRPs, and wherein, the counter, the maximum counter value, the timer, and a threshold associated with an event are configured for each of the one or multiple TRPs, and in response to starting a procedure of determining whether an event associated with a UE initiated beam report is triggered, the at least one processor is configured to cause the UE to:increase the value of the counter associated with a TRP by 1 in the case that a result of a quality of service (QoS) metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with the TRP minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to a threshold associated with the TRP; andstart or restart the timer associated with the TRP in response to a first determination of a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with the TRP minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP is larger than or equal to the threshold.5.The UE of claim 4, wherein, in the case that the corresponding periodic DL RS of the indicated joint or DL TCI states associated with the TRP changes, the at least one processor is configured to cause the UE to reset the value of the counter associated with the TRP to an initial value.6.The UE of claim 4, wherein,in the case that one UE initiated beam report is configured for the one or multiple TRPs, the at least one processor is configured to cause the UE to:determine whether the event associated with the one UE initiated beam report is triggered according to the counter associated with any TRP of the one or more TRPs; andin the case that multiple UE initiated beam reports are configured for multiple TRPs, wherein each UE initiated beam report is associated with a corresponding TRP of the multiple TRPs, the at least one processor is configured to cause the UE to:determine whether an event associated with a UE initiated beam report associated with a TRP of the multiple TRPs is triggered according to the counter associated with the TRP.7.The UE of claim 1, wherein, the at least one processor is configured to cause the UE to:receive dedicated scheduling request (SR) configuration indicating a dedicated SR resource for transmitting an indication of event associated with UE initiated beam report being triggered, wherein, the UE initiated beam report is an aperiodic channel state information (CSI) report associated with the dedicated SR resource.8.The UE of claim 7, wherein, the at least one processor is configured to cause the UE to:transmit an indication of event associated with UE initiated beam report being triggered in the dedicated SR resource; andreceive uplink grant DL control information (DCI) to trigger transmission of the UE initiated beam report associated with the dedicated SR request resource.9.The UE of claim 8, wherein, the indication of event associated with UE initiated beam report being triggered transmitted in the dedicated SR resource is multiplexed in a PUSCH in the case that the dedicated SR resource is overlapped with the PUSCH in time domain.10.The UE of claim 1, wherein, the at least one processor is configured to cause the UE to:transmit a UE initiated beam report in the case that the event associated with the UE initiated beam report is triggered in a media access control (MAC) control element (CE) in the PUSCH based on measurements of DL RSs same as or different from the periodic DL RSs for determining whether an event associated with a UE initiated beam report is triggered.11.The UE of claim 10, wherein, there is one or multiple transmit-receive points (TRPs) in the serving cell, and there are N, N>=2, activated joint or DL TCI states associated with each TRP of the one or more TRPs, including an indicated joint or DL TCI state associated with the TRP and (N-1) non-indicated joint or DL TCI states associated with the TRP other than the indicated joint or DL TCI state associated with the TRP, wherein, the indicated joint or DL TCI state associated with the TRP is a joint or DL TCI state indicated to be applicable from a time instance in the BWP for the TRP, N is same or different for different TRPs, and wherein, the UE initiated beam report in the MAC CE is based on the measurements of DL RSs in a TRP and the DL RSs are same as the periodic DL RSs for determining whether the event associated with the UE initiated beam report is triggered, and wherein, at most M, M>=1, reference resource indicators (RSIs) associated with the TRP are reported in the MAC CE, wherein a differential quality of service (QoS) metric of a DL RS corresponding to a RSI of the at most M RSIs is larger than or equal to a threshold for determining whether the event associated with the UE initiated beam report is triggered, and each differential QoS metric of the DL RS is a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with the TRP minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the TRP.12.The UE of claim 11, wherein, there are multiple TRPs in the serving cell, and each MAC CE comprises a field for indicating with which TRP the UE initiated beam report in the MAC CE is associated.13.The UE of claim 10, wherein, there is one or two transmit-receive points (TRPs) in the serving cell, and there are N, N>=2, activated joint or DL TCI states associated with each TRP of the one or two TRPs, including an indicated joint or DL TCI state associated with the TRP and (N-1) non-indicated joint or DL TCI states associated with the TRP other than the indicated joint or DL TCI state associated with the TRP, wherein, the indicated joint or DL TCI state associated with TRP is a joint or DL TCI state indicated to be applicable from a time instance in the BWP for the TRP, N is same or different for different TRPs, and wherein, the UE initiated beam report in the MAC CE is based on the measurements of DL RSs in each TRP and the DL RSs are same as the periodic DL RSs for determining whether the event associated with the UE initiated beam report is triggered, and wherein, at most 2*M, M>=1, reference resource indicators (RSIs) associated with the one or two TRPs are reported in the MAC CE, wherein a differential quality of service (QoS) metric of a DL RS corresponding to RSI of the at most 2*M RSIs is larger than or equal to a threshold for determining whether the event associated with the UE initiated beam report is triggered, and each differential QoS metric of the DL RS is a result of a QoS metric of a corresponding periodic DL RS associated with a non-indicated joint or DL TCI state of the (N-1) non-indicated joint or DL TCI states associated with a corresponding TRP minus a QoS metric of a corresponding periodic DL RS associated with the indicated joint or DL TCI state associated with the corresponding TRP.14.The UE of claim 10, wherein, the UE initiated beam report in the MAC CE is based on the measurements of DL RSs different from the periodic DL RSs for determining whether the event associated with the UE initiated beam report is triggered, wherein the UE initiated beam report is a CSI report configured with a type different from ‘periodic’ , ‘semi-persistent’ and ‘aperiodic. ’15.The UE of claim 10, wherein, the UE initiated beam report in the MAC CE is based on the measurements of a set of periodic DL RSs configured separately from the RSs for determining whether the event associated with the UE initiated beam report is triggered, wherein there are M, M>=1 reference resource indicator (RSI) fields in the MAC CE, M RSIs indicates M periodic DL RSs from the set of periodic DL RSs and a length of each RSI field is determined by a number of the DL RS set configured for the UE initiated beam report.16.The UE of claim 15, wherein the set of periodic DL RSs is a candidate resource set of candidate resource sets configured for beam failure recovery.17.The UE of claim 2, 4, 11, or 13, wherein,in the case that two control resource set (CORESET) pool index values are configured, two activated joint or DL TCI states are associated with one TRP in the case that the two activated joint or DL TCI states are associated with a same CORESET pool index value; andin the case that at least two joint or DL TCI states are activated in a codepoint of a TCI state activation MAC CE and each joint or DL TCI state in a codepoint of the MAC CE is indicated as a first TCI state or a second TCI state, two activated joint or DL TCI states are associated with one TRP in the case that the two activated joint or DL TCI states are both indicated as the first TCI state or both indicated as the second TCI state; otherwise, any two activated joint or DL TCI states are associated with one TRP.18.A processor for wireless communication, comprising:at least one controller coupled with at least one memory and configured to cause the processor to:receive information indicating periodic downlink (DL) reference signals (RSs) associated with all activated joint or DL transmission configuration indication (TCI) states of an activated bandwidth part (BWP) of a serving cell;determine whether an event associated with a UE initiated beam report is triggered based on measurements of the periodic DL RSs; andtransmit the UE initiated beam report in a physical uplink shared channel (PUSCH) in the case that the event associated with the UE initiated beam report is triggered.19.A network equipment (NE) for wireless communication, comprising:at least one memory; andat least one processor coupled with the at least one memory and configured to cause the RAN node to:transmit information indicating periodic downlink (DL) reference signals (RSs) associated with all activated joint or DL transmission configuration indication (TCI) states of an activated bandwidth part (BWP) of a serving cell, so that whether an event associated with a user equipment (UE) initiated beam report is triggered will be determined based on measurements of the periodic DL RSs in UE; andreceive a UE initiated beam report in a physical uplink shared channel (PUSCH) in the case that the event associated with the UE initiated beam report is triggered.20.A method performed by a user equipment (UE) , comprising:receiving information indicating periodic downlink (DL) reference signals (RSs) associated with all activated joint or DL transmission configuration indication (TCI) states of an activated bandwidth part (BWP) of a serving cell;determining whether an event associated with a UE initiated beam report is triggered based on measurements of the periodic DL RSs; andtransmitting the UE initiated beam report in a physical uplink shared channel (PUSCH) in the case that the event associated with the UE initiated beam report is triggered.