Channel state information reporting for multi-TRP operation
Patent Information
- Application Number
- PCT/CN2023/093055
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-05-09
- Publication Date
- 2024-12-19
Smart Images

Figure CN2023093055_19122024_PF_FP_ABST
Abstract
Description
Channel State Information Reporting for Multi-TRP OperationTechnical Field
[0001] The present disclosure generally relates to wireless communication, and in particular, to channel state information reporting for multi-TRP operation.Background
[0002] A user equipment (UE) may connect to a network via a base station. The base station may control multiple transmission and reception points (TRPs) . In some scenarios, the UE may operate in multi-TRP (mTRP) mode where the UE establishes and maintains a connection with multiple TRPs at the same time.
[0003] Typically, a UE will perform Layer-1 (L1) measurements on reference signals (RS) received from the base station (e.g., Channel State Information (CSI) RS) . These L1 measurements may include, for example, Reference Signal Received Power (RSRP) , Signal Interference + Noise Ratio (SINR) , Radio Link Monitoring (RLM) , Beam Failure Detection (BFD) , Candidate Beam Detection (CBD) , etc. When operating in mTRP receive (RX) mode, the UE may be able to make L1 measurements on the signals received from more than one TRP.Summary
[0004] Some exemplary embodiments are related to a method performed by a base station of a network having a first transmission and reception point (TRP) and a second TRP. The method includes generating a measurement configuration for a user equipment (UE) to measure reference signals (RSs) transmitted by the first TRP and the second TRP and perform group based beam reporting (GBBR) RS reporting for an RS pair comprising a first RS from a first resource set transmitted by the first TRP and a second RS from a second resource set transmitted by the second TRP, wherein the first RS and the second RS do not overlap in a time domain and transmitting the measurement configuration to the UE.
[0005] Other exemplary embodiments are related to a processor of a base station of a network having a first transmission and reception point (TRP) and a second TRP and configured to perform operations. The operations include generating a measurement configuration for a user equipment (UE) to measure reference signals (RSs) transmitted by the first TRP and the second TRP and perform group based beam reporting (GBBR) RS reporting for an RS pair comprising a first RS from a first resource set transmitted by the first TRP and a second RS from a second resource set transmitted by the second TRP, wherein the first RS and the second RS do not overlap in a time domain and transmitting the measurement configuration to the UE.
[0006] Still further exemplary embodiments are related to a method performed by a user equipment (UE) associated with a first transmission and reception point (TRP) and a second TRP of a network. The method includes receiving a measurement configuration to measure reference signals (RSs) transmitted by the first TRP and the second TRP and perform group based beam reporting (GBBR) RS reporting for a first RS pair comprising a first RS from a first resource set transmitted by the first TRP and a second RS from a second resource set transmitted by the second TRP and performing an operation based on at least the measurement configuration.
[0007] Additional exemplary embodiments are related to a processor of a user equipment (UE) associated with a first transmission and reception point (TRP) and a second TRP of a network and configured to perform operations. The operations include receiving a measurement configuration to measure reference signals (RSs) transmitted by the first TRP and the second TRP and perform group based beam reporting (GBBR) RS reporting for a first RS pair comprising a first RS from a first resource set transmitted by the first TRP and a second RS from a second resource set transmitted by the second TRP and performing an operation based on at least the measurement configurationBrief Description of the Drawings
[0008] Fig. 1 shows an exemplary network arrangement according to various exemplary embodiments.
[0009] Fig. 2 shows an exemplary user equipment (UE) according to various exemplary embodiments.
[0010] Fig. 3 shows an exemplary base station according to various exemplary embodiments.
[0011] Fig. 4 shows an exemplary arrangement of a UE operating in mTRP mode and receiving reference signals transmitted by a first TRP and a second TRP according to various exemplary embodiments.Detailed Description
[0012] The exemplary embodiments may be further understood with reference to the following description and the related appended drawings, wherein like elements are provided with the same reference numerals. The exemplary embodiments relate to Layer 1 (L1) reference signal (RS) measurements and group based beam reporting (GBBR) of the measurements for multi-transmission reception point (mTRP) operation.
[0013] The exemplary embodiments are described with regard to a user equipment (UE) . However, reference to a UE is merely provided for illustrative purposes. The exemplary embodiments may be utilized with any electronic component that may establish a connection to a network and is configured with the hardware, software, and / or firmware to exchange information and data with the network. Therefore, the UE as described herein is used to represent any appropriate type of electronic component.
[0014] The exemplary embodiments are also described with regard to a fifth generation (5G) New Radio (NR) network and a next generation node B (gNB) . However, reference to a 5G NR network and a gNB is merely provided for illustrative purposes. The exemplary embodiments may be utilized with any appropriate type of network and base station.
[0015] The gNB may be configured with multiple transmission and reception points (TRPs) . Throughout this description, a TRP generally refers to a set of components configured to transmit and / or receive a beam. In some embodiments, multiple TRPs may be deployed locally at the gNB. For example, the gNB may include multiple antenna arrays / panels that are each configured to generate a different beam. In other embodiments, multiple TRPs may be deployed at various different locations and connected to the gNB via a backhaul connection. For example, multiple small cells may be deployed at different locations and connected to the gNB. However, these examples are merely provided for illustrative purposes. Those skilled in the art will understand that TRPs are configured to be adaptable to a wide variety of different conditions and deployment scenarios. Thus, any reference to a TRP being a particular network component or multiple TRPs being deployed in a particular arrangement is merely provided for illustrative purposes. The TRPs described herein may represent any type of network component configured to transmit and / or receive a beam.
[0016] The exemplary embodiments are described with regard to multi-TRP (mTRP) operation. From the perspective of the UE, mTRP operation may include establishing and maintaining a connection with multiple TRPs at the same time. For example, different channel state information (CSI) -reference signals (RS) resource sets may be configured for different TRPs to support CSI measurement.
[0017] For group based CSI reporting for multi-receive (multi-Rx) chain UEs, two resource sets may be provided to UE for multiple TRPs. Those skilled in the art will understand that a UE equipped with multi-Rx chains are capable of using two (or more) Rx beams to simultaneously receive signals from different TRPs. The two resource sets can be used for group based beam reporting (GBBR) , and the UE will perform L1 measurement on RSs in a first resource set and RSs in a second resource set, and report the grouped CSI (L1-RSRP) to network. Such grouped CSI means that each reported grouped CSI includes a measurement for a CSI-RS from the first resource set and a CSI-RS from the second resource set. However, these configurations may lead to ambiguity for the UE when performing the L1 measurements. The ambiguities will be described in greater detail below.
[0018] According to some aspects, the exemplary embodiments provide network side solutions to resolve these ambiguities. Specifically, when GBBR is configured with two resource sets, the network will not configure RSs from two resource sets overlapped on the time domain or will not configure RSs from two resource sets on the same symbols.
[0019] According to other aspects, the exemplary embodiments provide UE side solutions to resolve these ambiguities. Specifically, when GBBR is configured with two resource sets and the network configured some RSs from two resource sets overlapped on time domain, the UE may not report one or more grouped CSI, or the UE will report grouped CSI and will not be limited by the condition of TD overlapping. In addition, when a measurement restriction applies, the UE measurement behavior will be clarified. Each of these exemplary aspects will be described in detail below.
[0020] While the exemplary embodiments provide benefits to the 5G NR networks, the exemplary embodiments are not limited to the 5G networks. The exemplary embodiments may be applied to any appropriate type of wireless communication system that implement mTRP operation. The exemplary embodiments introduced herein may be used independently from one another, in conjunction with other currently implemented mechanisms for mTRP operation, in conjunction with future implementations of mechanisms for mTRP operation or independent from other mechanisms for mTRP operation.
[0021] Fig. 1 shows an exemplary network arrangement 100 according to various exemplary embodiments. The exemplary network arrangement 100 includes a UE 110. Those skilled in the art will understand that the UE 110 may be any type of electronic component that is configured to communicate via a network, e.g., mobile phones, tablet computers, desktop computers, smartphones, phablets, embedded devices, wearables, Internet of Things (IoT) devices, etc. It should also be understood that an actual network arrangement may include any number of UEs being used by any number of users. Thus, the example of a single UE 110 is merely provided for illustrative purposes.
[0022] The UE 110 may be configured to communicate with one or more networks. In the example of the network arrangement 100, the network with which the UE 110 may wirelessly communicate is a 5G NR radio access network (RAN) 120. However, the UE 110 may also communicate with other types of networks (e.g., sixth generation (6G) RAN, 5G cloud RAN, a next generation RAN (NG-RAN) , a long term evolution (LTE) RAN, a legacy cellular network, a wireless local area network (WLAN) , etc. ) and the UE 110 may also communicate with networks over a wired connection. With regard to the exemplary embodiments, the UE 110 may establish a connection with the 5G NR RAN 120. Therefore, the UE 110 may have at least a 5G NR chipset to communicate with the 5G NR RAN 120.
[0023] The 5G NR RAN 120 may be a portion of a cellular network that may be deployed by a network carrier (e.g., Verizon, AT&T, T-Mobile, etc. ) . The 5G NR RAN 120 may include base stations or access nodes (Node Bs, eNodeBs, HeNBs, eNBS, gNBs, gNodeBs, macrocells, microcells, small cells, femtocells, etc. ) that are configured to send and receive traffic from UEs that are equipped with the appropriate cellular chip set.
[0024] In the network arrangement 100, the 5G NR RAN 120 deploys a gNB 120A. The gNB 120A may be configured with multiple TRPs. Each TRP may represent one or more components configured to transmit and / or receive a signal. In some embodiments, multiple TRPs may be deployed locally at the gNB 120A. In other embodiments, multiple TRPs may be distributed at different locations and connected to the gNB 120A via a backhaul connection. For example, multiple small cells may be deployed at different locations and connected to the gNB 120A. However, these examples are merely provided for illustrative purposes. Those skilled in the art will understand that TRPs are configured to be adaptable to a wide variety of different conditions and deployment scenarios. Thus, any reference to a TRP being a particular network component or multiple TRPs being deployed in a particular arrangement is merely provided for illustrative purposes. The TRPs described herein may represent any type of network component configured to transmit and / or receive a beam.
[0025] Those skilled in the art will understand that any association procedure may be performed for the UE 110 to connect to the 5G NR RAN 120. For example, as discussed above, the 5G NR RAN 120 may be associated with a particular cellular provider where the UE 110 and / or the user thereof has a contract and credential information (e.g., stored on a SIM card) . Upon detecting the presence of the 5G NR RAN 120, the UE 110 may transmit the corresponding credential information to associate with the 5G NR RAN 120. More specifically, the UE 110 may associate with a specific base station, e.g., the gNB 120A.
[0026] The network arrangement 100 also includes a cellular core network 130, the Internet 140, an IP Multimedia Subsystem (IMS) 150, and a network services backbone 160. The cellular core network 130 may refer an interconnected set of components that manages the operation and traffic of the cellular network. It may include the evolved packet core (EPC) and / or the 5G core (5GC) . The cellular core network 130 also manages the traffic that flows between the cellular network and the Internet 140. The IMS 150 may be generally described as an architecture for delivering multimedia services to the UE 110 using the IP protocol. The IMS 150 may communicate with the cellular core network 130 and the Internet 140 to provide the multimedia services to the UE 110. The network services backbone 160 is in communication either directly or indirectly with the Internet 140 and the cellular core network 130. The network services backbone 160 may be generally described as a set of components (e.g., servers, network storage arrangements, etc. ) that implement a suite of services that may be used to extend the functionalities of the UE 110 in communication with the various networks.
[0027] Fig. 2 shows an exemplary UE 110 according to various exemplary embodiments. The UE 110 will be described with regard to the network arrangement 100 of Fig. 1. The UE 110 may include a processor 205, a memory arrangement 210, a display device 215, an input / output (I / O) device 220, a transceiver 225 and other components 230. The other components 230 may include, for example, an audio input device, an audio output device, a power supply, a data acquisition device, ports to electrically connect the UE 110 to other electronic devices, etc.
[0028] The processor 205 may be configured to execute a plurality of engines of the UE 110. For example, the engines may include a mTRP engine 235. The mTRP engine 235 may perform various operations related to mTRP operation. To provide some general examples, the mTRP engine 235 may perform operations such as, but not limited to, dynamically switching between mTRP mode and sTRP mode, updating a CC-group for mTRP operation and determining a default downlink beam / TCI-state for mTRP PDSCH reception.
[0029] The above referenced mTRP engine 235 being an application (e.g., a program) executed by the processor 205 is merely provided for illustrative purposes. The functionality associated with the mTRP engine 235 may also be represented as a separate incorporated component of the UE 110 or may be a modular component coupled to the UE 110, e.g., an integrated circuit with or without firmware. For example, the integrated circuit may include input circuitry to receive signals and processing circuitry to process the signals and other information. The engine may also be embodied as one application or separate applications. In addition, in some UEs, the functionality described for the processor 205 is split among two or more processors such as a baseband processor and an applications processor. The exemplary embodiments may be implemented in any of these or other configurations of a UE.
[0030] The memory arrangement 210 may be a hardware component configured to store data related to operations performed by the UE 110. The display device 215 may be a hardware component configured to show data to a user while the I / O device 220 may be a hardware component that enables the user to enter inputs. The display device 215 and the I / O device 220 may be separate components or integrated together such as a touchscreen. The transceiver 225 may be a hardware component configured to establish a connection with the 5G NR-RAN 120, an LTE-RAN (not pictured) , a legacy RAN (not pictured) , a WLAN (not pictured) , etc. Accordingly, the transceiver 225 may operate on a variety of different frequencies or channels (e.g., set of consecutive frequencies) .
[0031] Fig. 3 shows an exemplary base station 300 according to various exemplary embodiments. The base station 300 may represent the gNB 120A or any other type of access node through which the UE 110 may establish a connection and manage network operations.
[0032] The base station 300 may include a processor 305, a memory arrangement 310, an input / output (I / O) device 315, a transceiver 320, multiple TRPs 325 and other components 330. The other components 330 may include, for example, an audio input device, an audio output device, a battery, a data acquisition device, ports to electrically connect the base station 300 to other electronic devices and / or power sources, TxRUs, transceiver chains, antenna elements, antenna panels, etc.
[0033] As indicated above, in some scenarios, the multiple TRPs 325 may be deployed locally at the base station 300. In other scenarios, one or more of the multiple TRPs 325 may be deployed at physical locations remote from the base station 300 and connected to the base statin via a backhaul connection. The base station 300 may be configured to control the multiple TRPs 325 and perform operations such as, but not limited to, assigning resources, configuring reference signals, implementing beam management techniques, etc.
[0034] The processor 305 may be configured to execute a plurality of engines for the base station 300. For example, the engines may include a mTRP engine 335. The mTRP engine 335 may perform various operations related to mTRP operation. To provide some general examples, the mTRP engine 335 may perform operations such as, but not limited to, transmitting a signal to trigger the UE 110 to dynamically switch between mTRP mode and sTRP mode, transmitting information to update a CC-group for mTRP operation and indicating a default downlink beam / TCI-state for mTRP PDSCH reception.
[0035] The above noted mTRP engine 335 being an application (e.g., a program) executed by the processor 305 is only exemplary. The functionality associated with the mTRP engine 335 may also be represented as a separate incorporated component of the base station 300 or may be a modular component coupled to the base station 300, e.g., an integrated circuit with or without firmware. For example, the integrated circuit may include input circuitry to receive signals and processing circuitry to process the signals and other information. In addition, in some base stations, the functionality described for the processor 305 is split among a plurality of processors (e.g., a baseband processor, an applications processor, etc. ) . The exemplary embodiments may be implemented in any of these or other configurations of a base station.
[0036] The memory arrangement 310 may be a hardware component configured to store data related to operations performed by the base station 300. The I / O device 315 may be a hardware component or ports that enable a user to interact with the base station 300. The transceiver 320 may be a hardware component configured to exchange data with the UE 110 and any other UEs in the network arrangement 100. The transceiver 320 may operate on a variety of different frequencies or channels (e.g., set of consecutive frequencies) . Therefore, the transceiver 320 may include one or more components to enable the data exchange with the various networks and UEs.
[0037] As mentioned above, when GBBR is used, the UE will perform L1 measurements on RSs in both the first and second resource sets and report the grouped CSI (L1-RSRP) to the network. Each reported grouped CSI includes one CSI-RS from the first resource set and one CSI-RS from the second resource set. In addition, when GBBR is configured, the network will provide the two resource sets to the UE, and each resource set will include one type of RS, either CSI-RS or a Synchronization Signal Block (SSB) . For example, the configuration of the RS may be CSI-RS+CSI-RS (e.g., resource set 1 contains CSI-RSs and resource set 2 contains CSI-RSs) or CSI-RS+SSB (resource set 1 contains CSI-RSs and resource set 2 contains SSBs, or vice versa) . As is described in more detail below, these RSs (e.g., CSI-RS+CSI-RS or CSI-RS+SSB) may overlap in the time domain, which will present issues for the UE when performing L1 measurements on the RSs. It is noted that the scenario SSB+SSB cannot overlap in the time domain so that scenario does not suffer from the issues described for CSI-RS+CSI-RS or CSI-RS+SSB.
[0038] These configurations may lead to ambiguity for the UE when performing the L1 measurements. For example, an issue may arise if the resource set 1 RS and the resource set 2 RS are configured on same time domain (TD) resource, e.g., same symbols. In such a case (e.g., RSs are configured on the same symbol) , a measurement restriction may have to be applied. No such measurement restriction is currently defined leaving the UE without a clear instruction as to how to perform the L1 measurements. As will be described in greater detail below, RSs from different resource sets may be considered to overlap in the time domain when the RSs are configured in the same symbol. However, RSs from different resource sets may also be considered to overlap in the time domain when the RSs are in different symbols but the UE is not capable of measuring the RSs even though they are not in the same symbol. The exemplary embodiments are applicable to each of these examples of RSs overlapping in the time domain.
[0039] As described above, the exemplary embodiments provide both network side and UE side solutions to the above identified issues. The following will first describe the network side solutions and then the UE side solutions will be described. However, prior to providing the solution, a general description of the of the TRPs, UE and resource sets will be described with reference to Fig. 4.
[0040] Fig. 4 shows an exemplary arrangement 400 of a UE 110 operating in mTRP mode and receiving reference signals transmitted by a first TRP 410 and a second TRP 420 according to various exemplary embodiments. In this example, it may be considered that the network has configured the Resource Set 1 comprising CSI-RS1 and CSI-RS2 to be transmitted by the TRP 410 and the Resource Set 2 comprising CSI-RS3 and CSI-RS4 to be transmitted by the TRP 420. In the description of the exemplary embodiments, the solutions will be described with reference to the CSI-RS+CSI-RS case. However, it should be understood that the exemplary embodiments are also applicable to the CSI-RS+SSB case. Thus, in the examples, whenever two CSI-RS are described, this should also be understood to be one CSI-RS and one SSB and the generic term RS refers to both CSI-RS and SSB.
[0041] As described above, when GBBR is configured, the UE 110 will measure the RSs in the Resource Set 1 transmitted by the TRP 410 and Resource Set 2 transmitted by the TRP 420 and perform group based reporting of the measurements. To provide an example, the UE may group or pair the CSI-RSs as follows for the GBBR reporting, CSI-RS1 and CSI-RS3 and CSI-RS2 and CSI-RS4. It should be understood this pairing is only exemplary and is intended to illustrate the concept that GBBR is used to report paired measurements from RSs in two different resource sets.
[0042] Continuing with the example started above (e.g., the UE 110 will report the measurements for CSI-RS1 and CSI-RS3) using GBBR the following scenario may be considered. The network has configured CSI-RS1 transmitted by TRP 410 and CSI-RS3 transmitted by TRP 420 to be on the same symbol. While the exemplary UE 110 is capable of using two simultaneous Rx beams to simultaneously measure the signals from TRP 410 and TRP 420, this capability is based on an understanding that the two simultaneous Rx beams are fixed. In some cases, the UE 110 may have to perform beam sweeping to perform the measurements of the RSs. In this case, there is a possibility that the UE 110 will miss one of the measurements for either CSI-RS1 or CSI-RS3. In this case, GBBR is not possible because one of the pair of measurements is missing. These missing measurements may cause the UE 110 and / or the network to operate in a suboptimal manner. Thus, as described above, the exemplary embodiments provide manners of addressing this issue.
[0043] The network side solution may be summarized as when GBBR is configured with two resource sets of CSI-RS+CSI-RS or CSI-RS+SSB, the network will not configure RSs from two resource sets overlapped on the time domain, or will not configure RSs from two resource sets on the same symbols, e.g., the gNB will not provide a UE with the above described measurement configurations. This means the RSs from the two different resource sets will be Time Division Multiplexed (TDM) on different symbols or on different symbols with an interval between each pair of RSs not less than a threshold.
[0044] Referring back to Fig. 4 and the example started above where the CSI-RSs are paired as CSI-RS1 and CSI-RS3 and CSI-RS2 and CSI-RS4 for the GBBR reporting. The above described solution where the network will not configure RSs from two resource sets overlapped on the time domain means that the network will not configure the CSI-RS1 and the CSI-RS3 on the same symbol. Similarly, the CSI-RS2 and CSI-RS4 will not be configured on the same symbol. For example, to follow this rule of the exemplary embodiments, the network may configure CSI-RS1 and CSI-RS2 to be transmitted by the TRP 410 on a first symbol and CSI-RS3 and CSI-RS4 to be transmitted by the TRP 420 on a second different symbol, e.g., the CSI-RS1 and the CSI-RS3 are TDM across symbols. Since the paired CSI-RS are not in the same symbol, the issue discussed above may not occur and the UE 110 may report the measurements using GBBR, e.g., paired measurements for CSI-RS1 / CSI-RS3 and CSI-RS2 / CSI-RS4.
[0045] In the above example, it may be considered that the first symbol and the second symbol are consecutive symbols in time. In some cases, when the RSs from two different resource sets are in consecutive symbols in time, this may still not leave enough time for the UE 110 to measure both RSs of the paired RSs, e.g., the time for the UE 110 to switch beams and perform beam sweeping is too long for measurements to be performed for two consecutive symbols. Thus, in these cases, while the RSs are not on the same symbol, the RSs may still be considered to be overlapped in time because the UE 110 may be unable to measure both RSs of the pair. Some exemplary embodiments resolve the issue with these cases by TDM the paired symbols from different resource sets with an interval that is not less than a threshold. This threshold may be indicated by the network (e.g., in the GBBR configuration) or may also be predefined in standards (e.g., 3GPP standards) .
[0046] These exemplary embodiments will also be described with reference to the example started above. Similar to the above exemplary embodiments, the network will not configure the CSI-RS1 and the CSI-RS3 pair or the CSI-RS2 and CSI-RS4 pair on the same symbol. Again, the network may configure CSI-RS1 and CSI-RS2 to be transmitted by the TRP 410 on a first symbol and CSI-RS3 and CSI-RS4 to be transmitted by the TRP 420 on a second different symbol. However, in this example, the first symbol and the second symbol may be separated by the threshold. To provide a specific example, the threshold may be set to one (1) symbol. Thus, CSI-RS1 and CSI-RS2 may be configured on symbol 1 and CSI-RS3 and CSI-RS4 may be configured on symbol 3, where symbol 2 is the threshold. However, it should be understood that a 1 symbol threshold is only exemplary.
[0047] In the above examples, it was considered that the RSs from the same resource set will be configured on the same symbol, e.g., CSI-RS1 and CSI-RS2 of the resource set 1 are configured on the same symbol. It should be understood that this is only exemplary in that the RSs from the same resource set may also occupy different symbols.
[0048] The following provides UE side solutions to the issues described above. In these examples, it may be considered that the network has configured the UE with GBBR but some RSs from two different resource sets are overlapped on time domain or in the same symbol, e.g., the gNB has provided the UE with a measurement configuration as described herein.
[0049] In some exemplary embodiments, the UE may not report one or more grouped CSI that are overlapped in time. These exemplary embodiments may be expressed as when the UE should report the grouped CSI, e.g., the grouped CSI (RS#i, RS#j) is reported when the L1 measurement on RS #i of resource set 1 and L1 measurement on RS #j of resource set 2 are not overlapped in the time domain, otherwise the UE does not report the grouped CSI) .
[0050] Again, these exemplary embodiments will be described with reference to Fig. 4. In this example, the following configuration may be considered. The CSI-RS1 of the Resource Set 1 and the CSI-RS3 of the Resource Set 2 may be configured on the same symbol (or overlap in the time domain) . The CSI-RS2 of the Resource Set 1 and the CSI-RS4 of the Resource Set 2 may be configured on the same symbol (or overlap in the time domain) but are not overlapping in the time domain with CSI-RS1 and CSI-RS3. Thus, as described above, the UE 110 may not be able to simultaneously measure CSI-RS1 / CSI-RS3 or CSI-RS2 / CSI-RS4. However, the UE 110 may be configured by the network to report the following GBBR pairs, CSI-RS1 / CSI-RS3, CSI-RS2 / CSI-RS4, CSI-RS1 / CSI-RS4 or CSI-RS2 / CSI-RS3. As described above, in these exemplary embodiments, the UE 110 may choose not to report one or more grouped CSI. In this example, the UE 110 may choose not to report the configured pairs CSI-RS1 / CSI-RS3 or CSI-RS2 / CSI- RS4 because the issue with measuring these pairs that are overlapped in time. However, the UE 110 may still report the pairs CSI-RS1 / CSI-RS4 and CSI-RS2 / CSI-RS3 because these pairs do not have the issue of being overlapped in time.
[0051] In other exemplary embodiments related to the UE side solutions, the UE may report grouped CSI that are overlapped in the time domain. However, when RSs from two resource sets are overlapped, a measurement restriction will be applied. The following will provide some exemplary measurement restrictions that may be applied.
[0052] Prior to describing the measurement restrictions, a general description of when a measurement restriction may be applied may be considered based on an example. Again, in this example, it may be considered that the network has configured the CSI-RS1 of the Resource Set 1 and the CSI-RS3 of the Resource Set 2 on the same symbol (or overlapped in the time domain) . As described above, the UE 110 may not be able to simultaneously measure CSI-RS1 and CSI-RS3. However, these RSs are not transmitted a single time, the CSI-RS1 and CSI-RS3 may be transmitted again at intervals, periodically or aperiodically. These multiple transmissions of the same RS may be termed different instances of the same RS, e.g., a first instance of the CSI-RS1 at a first time, a second instance of the CSI-RS1 at a second time, etc. Thus, it is possible to measure one RS of the pair (e.g., CSI-RS1) at a first time and the other RS of the pair (e.g., CSI-RS3) at a second time. However, the time between the first time and second time may matter because the channel (s) may change over time and the value of the paired CSI reporting may be lost if the measurements are too remote in time. Thus, the measurement restriction (s) may address this issue.
[0053] In one example, when a measurement restriction applies (e.g., the grouped CSI (CSI-RS#i, CSI-RS#j) from different resource sets overlap in time, the UE measurement behavior may be the CSI-RS#i L1 measurement first followed by the CSI-RS#j L1 measurement. Thus, to carry through with the example described above (e.g., grouped CSI-RS1 / CSI-RS3) , the UE 110 would perform the L1 measurement on CSI-RS1 at a first time and then perform the L1 measurement on CSI-RS3 at a second time and report the paired RSs in one GBBR grouped CSI.
[0054] In a second example, the same the UE measurement behavior may apply (e.g., CSI-RS#i L1 measurement first followed by the CSI-RS#j L1 measurement) . However, in this example, a time restriction may also apply. For example, the time interval between the CSI-RS#i L1 measurement and the CSI-RS#j L1 measurement may be within a predetermined threshold for the measurements to be reported as paired RSs in one GBBR grouped CSI. The threshold may be configured by the network or may also be predefined in standards (e.g., 3GPP standards) .
[0055] In a third example, the UE may be configured with multiple overlapping pairs. Consider the example described above where the UE 110 is configured to group CSI report CSI-RS1 / CSI-RS3 and CSI-RS2 / CSI-RS4 but both of these pairs overlap. The exemplary measurement restriction may be that the UE 110 will complete the measurement of all RSs in the two resource sets (e.g., CSI-RS1 and CSI-RS2 of the Resource Set 1 and CSI-RS3 and CSI-RS4 of the Resource Set 2) in a fixed time period. If the UE 110 completes the measurements within the fixed time periods, the UE 110 will report the pairs. However, if any of the RSs are not completed within the fixed time period, the UE 110 will not report any pairs that include the RS for which the L1 measurement was not completed.
[0056] The fixed time period may be configured by the network or may also be predefined in standards (e.g., 3GPP standards) . The fixed time period may be based on a time during which the channel (s) may be considered to remain coherent, e.g., the channel conditions have not changed substantially. One example of the fixed time period is 200 milliseconds. However, this is only an example and the fixed time period may be different based on different conditions that are being experienced by the UE, e.g., interference, mobility, etc.
[0057] Examples
[0058] In a first example, a processor of a base station of a network comprising a first transmission and reception point (TRP) and a second TRP is configured to perform operations comprising generating a measurement configuration for a user equipment (UE) to measure reference signals (RSs) transmitted by the first TRP and the second TRP and perform group based beam reporting (GBBR) RS reporting for an RS pair comprising a first RS from a first resource set transmitted by the first TRP and a second RS from a second resource set transmitted by the second TRP, wherein the first RS and the second RS do not overlap in a time domain and transmitting the measurement configuration to the UE.
[0059] In a second example, the processor of the first example, wherein the first RS and the second RS are channel state information RSs (CSI-RS) .
[0060] In a third example, the processor of the first example, wherein the first RS is a channel state information RSs (CSI-RS) and the second RS is a synchronization signal block (SSB) .
[0061] In a fourth example, the processor of the first example, wherein the first RS and the second RS are time domain multiplexed (TDM) in different symbols.
[0062] In a fifth example, the processor of the fourth example, wherein the different symbols are consecutive symbols.
[0063] In a sixth example, the processor of the fourth example, wherein the different symbols are separated by a predetermined interval.
[0064] In a seventh example, a base station comprising a transceiver configured to communicate with a user equipment (UE) and the processor of any of the first through sixth examples that is communicatively coupled to the transceiver.
[0065] In an eighth example, a processor of a user equipment (UE) associated with a first transmission and reception point (TRP) and a second TRP of a network is configured to perform operations comprising receiving a measurement configuration to measure reference signals (RSs) transmitted by the first TRP and the second TRP and perform group based beam reporting (GBBR) RS reporting for a first RS pair comprising a first RS from a first resource set transmitted by the first TRP and a second RS from a second resource set transmitted by the second TRP and performing an operation based on at least the measurement configuration.
[0066] In a ninth example, the processor of the eighth example, wherein, when the first RS and the second RS do not overlap in a time domain, the operation comprises performing measurements on the first RS and the second RS and reporting the measurements for the first RS and the second RS using the GBBR RS reporting.
[0067] In a tenth example, the processor of the eighth example, wherein the first RS and the second RS overlap in a time domain.
[0068] In an eleventh example, the processor of the tenth example, wherein the operation comprises omitting the GBBR RS reporting for the first RS pair.
[0069] In a twelfth example, the processor of the tenth example, wherein the operation comprises applying a measurement restriction comprising measuring a first instance of the first RS transmitted by the first TRP at a first time and measuring a second instance of the second RS transmitted by the second TRP at a second time, wherein a first instance of the second RS overlaps in the time domain with the first instance of the first RS and reporting the measurements for the first instance of the first RS and the second instance of the second RS using the GBBR RS reporting.
[0070] In a thirteenth example, the processor of the twelfth example, wherein the measurement restriction further comprises the first instance of the first RS and the second instance of the second RS occurring within a predetermined time threshold.
[0071] In a fourteenth example, the processor of the tenth example, wherein the measurement configuration further comprises a second RS pair comprising a third RS from the first resource set transmitted by the first TRP and a fourth RS from the second resource set transmitted by the second TRP, wherein the operation comprises applying a measurement restriction comprising measuring an instance of the first RS, an instance of the second RS, an instance of the third RS and an instance of the fourth RS within a fixed period of time and reporting the measurements for the first RS pair and the second RS pair using the GBBR RS reporting.
[0072] In a fifteenth example, the processor of the tenth example, wherein overlapping in the time domain comprises the first RS and the second RS being in a same symbol.
[0073] In a sixteenth example, the processor of the eighth example, wherein the first RS and the second RS are channel state information RSs (CSI-RS) .
[0074] In a seventeenth example, the processor of the eighth example, wherein the first RS is a channel state information RSs (CSI-RS) and the second RS is a synchronization signal block (SSB) .
[0075] In an eighteenth example, a user equipment (UE) comprising a transceiver configured to communicate with a base station and the processor of any of the eighth through seventeenth examples that is communicatively coupled to the transceiver.
[0076] Those skilled in the art will understand that the above-described exemplary embodiments may be implemented in any suitable software or hardware configuration or combination thereof. An exemplary hardware platform for implementing the exemplary embodiments may include, for example, an Intel x86 based platform with compatible operating system, a Windows OS, a Mac platform and MAC OS, a mobile device having an operating system such as iOS, Android, etc. The exemplary embodiments described above may be embodied as a program containing lines of code stored on a non-transitory computer readable storage medium that, when compiled, may be executed on a processor or microprocessor.
[0077] Although this application described various embodiments each having different features in various combinations, those skilled in the art will understand that any of the features of one embodiment may be combined with the features of the other embodiments in any manner not specifically disclaimed or which is not functionally or logically inconsistent with the operation of the device or the stated functions of the disclosed embodiments.
[0078] It is well understood that the use of personally identifiable information should follow privacy policies and practices that are generally recognized as meeting or exceeding industry or governmental requirements for maintaining the privacy of users. In particular, personally identifiable information data should be managed and handled so as to minimize risks of unintentional or unauthorized access or use, and the nature of authorized use should be clearly indicated to users.
[0079] It will be apparent to those skilled in the art that various modifications may be made in the present disclosure, without departing from the spirit or the scope of the disclosure. Thus, it is intended that the present disclosure cover modifications and variations of this disclosure provided they come within the scope of the appended claims and their equivalent.
Claims
1.A method comprising:at a base station of a network comprising a first transmission and reception point (TRP) and a second TRP:generating a measurement configuration for a user equipment (UE) to measure reference signals (RSs) transmitted by the first TRP and the second TRP and perform group based beam reporting (GBBR) RS reporting for an RS pair comprising a first RS from a first resource set transmitted by the first TRP and a second RS from a second resource set transmitted by the second TRP, wherein the first RS and the second RS do not overlap in a time domain; andtransmitting the measurement configuration to the UE.2.The method of claim 1, wherein the first RS and the second RS are channel state information RSs (CSI-RS) .3.The method of claim 1, wherein the first RS is a channel state information RSs (CSI-RS) and the second RS is a synchronization signal block (SSB) .4.The method of claim 1, wherein the first RS and the second RS are time domain multiplexed (TDM) in different symbols.5.The method of claim 4, wherein the different symbols are consecutive symbols.6.The method of claim 4, wherein the different symbols are separated by a predetermined interval.7.A method comprising:at a user equipment (UE) associated with a first transmission and reception point (TRP) and a second TRP of a network:receiving a measurement configuration to measure reference signals (RSs) transmitted by the first TRP and the second TRP and perform group based beam reporting (GBBR) RS reporting for a first RS pair comprising a first RS from a first resource set transmitted by the first TRP and a second RS from a second resource set transmitted by the second TRP; andperforming an operation based on at least the measurement configuration.8.The method of claim 7, wherein, when the first RS and the second RS do not overlap in a time domain, the operation comprises:performing measurements on the first RS and the second RS; andreporting the measurements for the first RS and the second RS using the GBBR RS reporting.9.The method of claim 7, wherein the first RS and the second RS overlap in a time domain.10.The method of claim 9, wherein the operation comprises:omitting the GBBR RS reporting for the first RS pair.11.The method of claim 9, wherein the operation comprises:applying a measurement restriction comprising measuring a first instance of the first RS transmitted by the first TRP at a first time and measuring a second instance of the second RS transmitted by the second TRP at a second time, wherein a first instance of the second RS overlaps in the time domain with the first instance of the first RS; andreporting the measurements for the first instance of the first RS and the second instance of the second RS using the GBBR RS reporting.12.The method of claim 11, wherein the measurement restriction further comprises the first instance of the first RS and the second instance of the second RS occurring within a predetermined time threshold.13.The method of claim 9, wherein the measurement configuration further comprises a second RS pair comprising a third RS from the first resource set transmitted by the first TRP and a fourth RS from the second resource set transmitted by the second TRP, wherein the operation comprises:applying a measurement restriction comprising measuring an instance of the first RS, an instance of the second RS, an instance of the third RS and an instance of the fourth RS within a fixed period of time; andreporting the measurements for the first RS pair and the second RS pair using the GBBR RS reporting.14.The method of claim 9, wherein overlapping in the time domain comprises the first RS and the second RS being in a same symbol.15.The method of claim 7, wherein the first RS and the second RS are channel state information RSs (CSI-RS) .16.The method of claim 7, wherein the first RS is a channel state information RSs (CSI-RS) and the second RS is a synchronization signal block (SSB) .
