Opportunistic transmission of reference signals

Abstract

Certain aspects of the present disclosure provide techniques for opportunistic transmission of periodic reference signals. One example method performed at a user equipment (UE) includes receiving first signaling configuring the UE with a first set of reference signals (RSs) resources for periodically transmitting and at least a second set of periodic RS resources for opportunistic transmission of RSs; receiving a second signaling indicating when an RS is to be transmitted in the transmission opportunity of the second set of RS resources; calculating a temporal correlation metric based on measurements of RSs transmitted in the transmission opportunity of the second set of RS resources according to the second signaling and measurements of RSs transmitted in the transmission opportunity of the first set of RS resources; and sending a report indicating the temporal correlation metric.

Description

BACKGROUND

[0001]

[0002] Aspects of the disclosure relate to wireless communications, and more particularly, to techniques for opportunistic transmission of reference signals (RSs).

[0003] RELATED ART

[0004] Wireless communications systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, or other similar types of services. These wireless communications systems can employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and other similar technologies.

[0005] Despite the tremendous technological advancements in wireless communications systems over the years, challenges remain. For example, complex and dynamic environments can still attenuate or block signals between a wireless transmitter and a wireless receiver. Thus, there is a continuing desire to improve the technical performance of wireless communications systems, including, for example: improving the speed and data carrying capacity of communications, improving the efficiency of use of shared communications media, reducing the power used by transmitters and receivers in performing communications, improving the reliability of wireless communications, avoiding redundant transmissions and / or receptions and related processing, improving the coverage area of wireless communications, increasing the number and types of devices that can access a wireless communications system, increasing the ability of different types of devices to communicate with each other, increasing the number and types of wireless communications media that are available for use, etc. Thus, there is a need to further improve wireless communications systems to overcome the aforementioned technical challenges and others. SUMMARY

[0006] One aspect provides a method for wireless communications at a user equipment (UE). The method includes receiving first signaling that configures the UE with a first set of reference signal (RS) resources for periodic transmission of RSs and at least a second set of periodic RS resources for opportunistic transmission of RSs, receiving second signaling that indicates when RSs are to be transmitted in transmission occasions of the second set of RS resources, computing a time correlation metric based on measurements of RSs transmitted in the transmission occasions of the second set of RS resources according to the second signaling and measurements of RSs transmitted in transmission occasions of the first set of RS resources, and transmitting a report that indicates the time correlation metric.

[0007] Another aspect provides a method for wireless communication at a network entity. The method includes transmitting first signaling that configures a user equipment (UE) with a first set of reference signal (RS) resources for periodically transmitting RSs and at least a second set of periodic RS resources for opportunistically transmitting RSs, transmitting second signaling that indicates when RSs are to be transmitted in transmission occasions of the second set of RS resources, and receiving a report that indicates a time correlation metric that is computed by the UE based on measurements of RSs transmitted in the transmission occasions of the second set of RS resources in accordance with the second signaling and measurements of RSs transmitted in transmission occasions of the first set of RS resources.

[0008] Other aspects provide an apparatus that is operable to, configured to, or otherwise adapted to perform any one or more of the methods previously described and / or those described elsewhere herein; a non-transitory computer readable medium comprising instructions that, when executed by a processor of an apparatus, cause the apparatus to perform the methods previously described and those described elsewhere herein; a computer program product embodied on a computer readable storage medium comprising code for performing the methods previously described and those described elsewhere herein; and / or an apparatus comprising means for performing the methods previously described and those described elsewhere herein. By way of example, an apparatus can include a processing system, a device having a processing system, or a processing system in cooperation with one or more networks.

[0009] The following description and drawings are illustrative of certain aspects. BRIEF DESCRIPTION OF DRAWINGS

[0010] The attached drawings illustrate certain aspects of the various aspects described herein and are a part of the specification. The drawings provided are intended to facilitate understanding of various aspects of the disclosure and, in relation to the description below, do not purport to be an exclusive or exhaustive illustration of the various aspects described herein.

[0011] FIG. 1 An example wireless communication network is depicted.

[0012] FIG. 2 An example disaggregated base station architecture is depicted.

[0013] FIG. 3 Aspects of an example base station and an example user equipment are depicted.

[0014] FIG. 4A , FIG. 4B , FIG. 4C And FIG. 4D Various example aspects of data structures for a wireless communication network are depicted.

[0015] FIG. 5A and FIG. 5B An example timing diagram depicting a discontinuous reception (DRX) cycle and a discontinuous transmission (DTX) cycle is depicted.

[0016] FIG. 6 An example tracking reference signal (TRS) configuration is depicted.

[0017] FIG. 7 An example slot allocation according to certain aspects of the present disclosure is depicted.

[0018] FIG. 8 A call flow diagram according to certain aspects of the present disclosure is depicted.

[0019] FIG. 9A and FIG. 9B An example slot allocation according to certain aspects of the present disclosure is depicted.

[0020] FIG. 10A and FIG. 10B An example time domain lag according to certain aspects of the present disclosure is depicted.

[0021] FIG. 11A and FIG. 11B A physical downlink control channel (PDCCH) in an example slot allocation according to certain aspects of the present disclosure is depicted.

[0022] FIG. 12A and FIG. 12B A two-stage PDCCH in an example slot allocation according to certain aspects of the present disclosure is depicted.

[0023] FIG. 13 An example channel state information (CSI) measurement configuration information element (IE) according to certain aspects of the present disclosure is depicted.

[0024] FIG. 14 A method for wireless communication is depicted.

[0025] FIG. 15 A method for wireless communication is depicted.

[0026] FIG. 16 Aspects of an example communication device are depicted. DETAILED DESCRIPTION

[0027] Aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable media for opportunistic transmission of reference signals (RSs).

[0028] In some scenarios, it can be beneficial to perform a type of channel state reporting that indicates time correlation of certain channel measurements at different points in time. For example, such time domain channel property (TDCP) reporting can be beneficial for user equipment (UE) traveling at certain speeds by utilizing time domain correlation / Doppler domain information to assist in determining the best precoding for downlink transmissions.

[0029] In some cases, a UE can be configured to report TDCP based on channel state information reference signals (CSI-RS) for tracking, referred to as tracking reference signals (TRS). TRS-based TDCP reporting can be based on a time domain correlation profile determined, for example, as a correlation within one TRS resource or across multiple TRS resources.

[0030] In some cases, a UE can be configured to report time correlation on one or more lags of a TRS resource, where a lag refers to a time distance between measured TRSs. These lags can be within one TRS (e.g., a TRS burst), between different TRSs, and / or between a TRS and a different RS. When configured for multiple-lag time correlation reporting, a UE can need to measure TRSs and / or RSs across multiple transmissions / bursts.

[0031] However, current resource saving and network energy saving (NES) techniques generally do not properly account for TDCP RSs. For example, when a network is configured to refrain from transmitting to save power, TRSs without certain reporting configurations or with TDCP reporting configurations can have different behavior during cell discontinuous transmission (DTX). Additionally, periodic RSs and aperiodic RSs can use different time references (e.g., absolute time based on system frame number SFN, periodicity, and / or offset) when compared to a time reference based on a DCI slot and a trigger offset.

[0032] Furthermore, in some wireless communication standards, periodic TRS configurations can only support periodicities that are not suitable to support certain lags (e.g., 10 ms, 20 ms, 40 ms, 80 ms). For example, using a supported TRS periodicity, only certain types of lag values can be supported within a TRS (e.g., 4 symbols, 1 slot).

[0033] Aspects of the present disclosure provide techniques for opportunistic transmission of RSs with a resource set of periodic RS resources. Certain time correlation metrics can be computed based on measurements of periodically transmitted RSs and opportunistically transmitted RSs, which can enable improved TDCP reporting indicating the time correlation metrics. Utilizing the techniques disclosed herein can result in flexible TDCP reporting, better downlink precoding, improved resource saving and NES, better system performance, and improved overall user experience.

[0034] Introduction to wireless communication networks

[0035] The techniques and methods described herein can be used for various wireless communication networks. Although aspects can be described herein using terminology commonly associated with 3G, 4G, and / or 5G wireless technologies, aspects of the present disclosure can be applied in other communication systems and standards not explicitly mentioned.

[0036] FIG. 1 An example of a wireless communication network 100 in which aspects described herein can be implemented is depicted.

[0037] Generally, the wireless communication network 100 includes various network entities (alternatively, network elements or network nodes). A network entity is generally a communication device and / or a communication function performed by a communication device (e.g., a user equipment (UE), a base station (BS), a component of a BS, a server, etc.). For example, various functions of a network and various devices associated with and interacting with the network can be considered network entities. Further, the wireless communication network 100 includes ground-based aspects, such as ground-based network entities (e.g., BSs 102), and non-ground-based aspects, such as satellites 140 and aircraft 145, which can include onboard network entities (e.g., one or more BSs) capable of communicating with other network elements (e.g., ground-based BSs) and user equipment.

[0038] In the depicted example, the wireless communication network 100 includes BSs 102, UEs 104, and one or more core networks, such as an evolved packet core (EPC) 160 and a 5G core (5GC) network 190, that interoperate to provide communication services over various communication links, including wired and wireless links.

[0039] FIG. 1 Various example UEs 104 are depicted, which can more generally include: a cellular telephone, a smartphone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor / actuator, a display, an Internet of Things (IoT) device, an always-on (AON) device, an edge processing device, or other similar devices. A UE 104 can also be more generally referred to as a mobile device, a wireless device, a wireless communication device, a station, a mobile station, a subscriber station, a mobile subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a remote device, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, and / or the like.

[0040] The BS 102 wirelessly communicates (e.g., sends signals to and receives signals from) with the UE 104 via communication link 120. The communication link 120 between the BS 102 and the UE 104 can include uplink (UL) (also referred to as reverse link) transmissions from the UE 104 to the BS 102 and / or downlink (DL) (also referred to as forward link) transmissions from the BS 102 to the UE 104. In various aspects, the communication link 120 can utilize multiple-input multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity.

[0041] The BSs 102 can generally include NodeBs, enhanced NodeBs (eNBs), next generation enhanced NodeBs (ng-eNBs), next generation NodeBs (gNBs or gNodeBs), access points, transceiver base stations, radio base stations, radio transceivers, transceiver functions, transmission reception points, and / or the like. Each of the BSs 102 can provide communication coverage for a respective geographic coverage area 110, which can sometimes be referred to as a cell, and which can overlap in some scenarios (for example, small cells 102' can have a coverage area 110' that overlaps with a coverage area 110 of a macro cell). For example, a BS can be a macro cell (covering relatively large geographic areas), a pico cell (covering relatively small geographic areas, such as a stadium), a femto cell (covering a relatively small geographic area, such as a home), and / or the like.

[0042] While the BSs 102 are depicted as single communication devices in various aspects, the BSs 102 can be implemented in various configurations. For example, one or more components of the base station can be split into a central unit (CU), one or more distributed units (DUs), one or more radio units (RUs), a near real-time (near-RT) RAN intelligent controller (RIC), or a non-RT RIC, to name a few examples. In another example, various aspects of the base station can be virtualized. More generally, a base station (e.g., the BS 102) can include components located at a single physical location or components located at various physical locations. In examples in which the base station includes components located at various physical locations, the various components can each perform functions such that the various components collectively implement similar functionality as a base station located at a single physical location. In some aspects, a base station that includes components located at various physical locations can be referred to as a disaggregated radio access network architecture, such as an open RAN (O-RAN) or virtualized RAN (VRAN) architecture. FIG. 2 An example disaggregated base station architecture is depicted and described.

[0043] Different BSs 102 within the wireless communication network 100 can also be configured to support different radio access technologies, such as 3G, 4G, and / or 5G. For example, BSs 102 configured for 4G LTE (collectively referred to as the Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) can interface with the EPC 160 through first backhaul links 132 (e.g., S I interface). BSs 102 configured for 5G (e.g., 5G NR or Next Generation RAN (NG-RAN)) can interface with the 5GC 190 through second backhaul links 184. The BSs 102 can communicate with one another directly or indirectly (e.g., through the EPC 160 or 5GC 190) over third backhaul links 134 (e.g., X2 interface), which can be wired or wireless.

[0044] The wireless communication network 100 can subdivide the electromagnetic spectrum into various classes, bands, channels, or other characteristics. In some aspects, the subdivision is provided based on wavelength and frequency, where frequency can also be referred to as a carrier, subcarrier, frequency channel, tone, or sub-band. For example, 3GPP currently defines frequency range 1 (FR1) to include 410-7125 MHz, which is often (interchangeably) referred to as “sub-6 GHz.” Similarly, 3GPP currently defines frequency range 2 (FR2) to include 24,250-52,600 MHz, which is sometimes (interchangeably) referred to as “millimeter wave” (“mmW” or “mmWave”). Base stations configured to communicate using mmWave / near-mmWave radio frequency bands (e.g., mmWave base stations such as the BSs 180) can utilize beamforming (e.g., 182) with UEs (e.g., 104) to improve path loss and range.

[0045] The communication links 120 between the BSs 102 and, for example, the UEs 104 can be through one or more carriers, which can be portions of the spectrum (e.g., 5, 10, 15, 20, 100, 400, and / or other MHz) that are spectrally separated from each other but can or can not be adjacent to each other. The carriers can be according to FDD, TDD, and / or a combination thereof. The carriers can or can not be symmetric. The BSs 102 and the UEs 104 can communicate over one or more carriers using a spectrum band. The BSs 102 and the UEs 104 can be configured with a carrier aggregation (CA) that includes a primary component carrier (PCC) and one or more secondary component carriers (SCCs). The BSs 102 and the UEs 104 can communicate over a licensed spectrum, an unlicensed spectrum, or a combination thereof. The carriers can be located in the far-ultra high frequency (FHUF) spectrum.

[0046] Communications using higher frequency bands can have higher path loss and a shorter range as compared to lower frequency communications. Thus, certain base stations (e.g., macro BSs 180) can operate in a lower frequency band (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 12, 13, 14, 20, 21, 28, 29, 30, 40, 60, 70, 80, 90, 100 GHz, and beyond), while certain other base stations (e.g., small cell FIG. 1The use of beamforming 182 with the UEs 104 can improve path loss and range in the communications between BS 180 and the UEs 104. For example, the BS 180 and the UEs 104 can each include multiple antennas, such as antenna elements, antenna panels, and / or antenna arrays, to facilitate beamforming. In some cases, the BS 180 can transmit beamformed signals to the UEs 104 in one or more transmit directions 182'. The UEs 104 can receive beamformed signals from the BS 180 in one or more receive directions 182". The UEs 104 can also transmit beamformed signals to the BS 180 in one or more transmit directions 182". The BS 180 can also receive beamformed signals from the UEs 104 in one or more receive directions 182'. The BS 180 and the UEs 104 can then perform beam training to determine the best receive and transmit directions for each of the BS 180 and the UEs 104. Notably, the transmit and receive directions of the BS 180 can or can not be the same. Similarly, the transmit and receive directions of the UEs 104 can or can not be the same.

[0047] The wireless communications network 100 also includes a Wi-Fi AP 150 in communication with Wi-Fi stations (STAs) 152 via communication links 154, e.g., in 2.4 GHz and / or 5 GHz unlicensed spectrum.

[0048] Certain UEs 104 can communicate with each other using device-to-device (D2D) communication link 158. The D2D communication link 158 can use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), a physical sidelink control channel (PSCCH), and / or a physical sidelink feedback channel (PSFCH).

[0049] The EPC 160 can include various function components, including a mobility management entity (MME) 162, other MMEs 164, a serving gateway 166, a multimedia broadcast multicast service (MBMS) gateway 168, a broadcast multicast service center (BM-SC) 170, and / or a packet data network (PDN) gateway 172, such as in the depicted example. The MME 162 can be in communication with a home subscriber server (HSS) 174. The MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160. Generally, the MME 162 provides bearer and connection management.

[0050] Generally, user Internet Protocol (IP) packets are conveyed through the serving gateway 166, which itself is connected to the PDN gateway 172. The PDN gateway 172 provides UE IP address allocation as well as other functions. The PDN gateway 172 and BM-SC 170 are connected to the IP services 176, which can include, for example, the Internet, an intranet, an IP multimedia subsystem (IMS), a packet switched (PS) streaming sendee, and / or other IP services.

[0051] The BM-SC 170 can provide functions for MBMS user service provisioning and delivery. The BM-SC 170 can serve as an entry point for content provider MBMS transmission, can be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN), and / or can be used to schedule MBMS transmissions. The MBMS Gateway 168 can be used to

[0052] The 5GC 190 can include various function components including an Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195. The AMF 192 can be in communication with a Unified Data Management (UDM) 196.

[0053] The AMF 192 is the control node that processes the signaling between the UE 104 and the 5GC 190. The AMF 192 provides, for example, Quality of Service (QoS) flow and session management.

[0054] Internet Protocol (IP) packets are conveyed through the UPF 195, which is connected to the IP Services 197 and provides UE Internet Protocol address allocation as well as other functions for the 5GC 190. The IP Services 197 can include, for example, the Internet, an intranet, an IMS, a PS streaming service, and / or other IP services.

[0055] In various aspects, a network entity or network node can be implemented as an aggregated base station, disaggregated base station, component of a base station, an integrated access and backhaul (IAB) node, a relay node, a sidelink node, to name a few examples.

[0056] FIG. 2An example disaggregated base station 200 architecture is depicted. The disaggregated base station 200 architecture can include one or more central units (CU) 210 that can communicate directly with a core network 220 via a backhaul link, or indirectly with the core network 220 through one or more disaggregated base station units, such as a near real-time (near-RT) RAN intelligent controller (RIC) 225 via an E2 link, or a non-real-time (non-RT) RIC 215 associated with a service management and orchestration (SMO) framework 205, or both. The CU 210 can communicate with one or more distributed units (DU) 230 via respective fronthaul links, such as Fl interfaces. The DU 230 can communicate with one or more radio units (RU) 240 via respective front-haul links. The RU 240 can communicate with respective UEs 104 via one or more radio frequency (RF) access links. In some implementations, a UE 104 can be simultaneously served by multiple RUs 240.

[0057] Each of the units (e.g., CU 210, DU 230, RU 240, and near-RT RIC 225, non-RT RIC 215, and SMO framework 205) can include or be coupled to one or more interfaces configured to receive or transmit signals, data, or information (collectively, signals) via wired or wireless transmission media. The associated processor or controller providing instructions to the communication interface of each of the units or the unit can be configured to communicate with one or more of the other units via the transmission media. For example, the units can include a wired interface configured to receive or transmit signals to one or more of the other units over a wired transmission medium. Additionally or alternatively, the units can include a wireless interface, which can include a receiver, a transmitter, or a transceiver (such as a radio frequency (RF) transceiver) configured to receive or transmit signals to one or more of the other units over a wireless transmission medium, or both.

[0058] In some aspects, the CU 210 can host one or more higher layer control functions. Such control functions can include radio resource control (RRC), packet data convergence protocol (PDCP), service data adaptation protocol (SDAP), and / or the like. Each control function can be implemented with an interface configured to communicate signals with other control functions hosted by the CU 210. The CU 210 can be configured to handle user plane functionality (e.g., central unit-user plane (CU-UP)), control plane functionality (e.g., central unit-control plane (CU-CP)), or a combination thereof. In some implementations, the CU 210 can be logically split into one or more CU-UP units and one or more CU-CP units. When implemented in an O-RAN configuration, the CU-UP units can be in bidirectional communication with the CU-CP units via an interface, such as an El interface. The CU 210 can be implemented to communicate with the DUs 230 as needed for network control and signaling.

[0059] The DU 230 can correspond to a logical unit that includes one or more base station functions for controlling the operation of one or more RUs 240. In some aspects, the DU 230 can host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, and / or the like) in accordance, at least in part, with a functional split, such as those defined by the 3rd Generation Partnership Project (3GPP). In some aspects, the DU 230 can also host one or more low PHY layers. Each layer (or module) can be implemented with an interface configured to communicate signals with other layers (and modules) hosted by the DU 230 or with control functions hosted by the CU 210.

[0060] The lower layer functionality can be implemented by one or more RUs 240. In some deployments, the RUs 240 controlled by the DU 230 can correspond to logical nodes that host RF processing functions or low PHY layer functions (such as performing fast Fourier transform (FFT), inverse FFT (iFFT), digital beamforming, physical random access channel (PRACH) extraction and filtering, and / or the like) or both based, at least in part, on a functional split, such as a lower layer functional split. In such an architecture, the RUs 240 can be implemented to handle over-the-air (OTA) communications with one or more UEs 104. In some implementations, real-time and non-real-time aspects of control plane and user plane communications with the RUs 240 can be controlled by the corresponding DU 230. In some scenarios, this configuration can enable the DUs 230 and the CUs 210 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.

[0061] The SMO framework 205 can be configured to support RAN deployment and orchestration of non-virtualized network elements and virtualized network elements. For non-virtualized network elements, the SMO framework 205 can be configured to support deployment of dedicated physical resources for RAN coverage requirements, which can be managed via an operations and maintenance interface, such as an Ol interface. For virtualized network elements, the SMO framework 205 can be configured to interact with a cloud computing platform, such as Open Cloud (O-Cloud) 290, to perform network element lifecycle management, such as instantiating virtualized network elements, via a cloud computing platform interface, such as an 02 interface. Such virtualized network elements can include, but are not limited to, CUs 210, DUs 230, RUs 240, and near-RT RICs 225. In some implementations, the SMO framework 205 can communicate with hardware aspects of a 4G RAN, such as Open eNB (O-eNB) 211, via an Ol interface. Additionally, in some implementations, the SMO framework 205 can communicate directly with one or more RUs 240 via an Ol interface. The SMO framework 205 can also include a non-RT RIC 215 configured to support functionality of the SMO framework 205.

[0062] The non-RT RIC 215 can be configured to include logical functions that enable non-real-time control and optimization of RAN elements and resources, artificial intelligence / machine learning (AI / ML) workflows including model training and updates, or policy-based steering of applications / features in the near-RT RIC 225. The non-RT RIC 215 can be coupled to or in communication with the near-RT RIC 225, such as via an Al interface. The near-RT RIC 225 can be configured to include logical functions that enable near-real-time control and optimization of RAN elements and resources via data collection and actions through an interface, such as via an E2 interface, that connects one or more CUs 210, one or more DUs 230, or both, and an O-eNB with the near-RT RIC 225.

[0063] In some implementations, to generate AI / ML models to be deployed in the near-RT RIC 225, the non-RT RIC 215 can receive parameters or external enrichment information from an external server. Such information can be utilized by the near-RT RIC 225 and can be received at the SMO framework 205 or the non-RT RIC 215 from non-network data sources or from network functions. In some examples, the non-RT RIC 215 or the near-RT RIC 225 can be configured to tune RAN behavior or performance. For example, the non-RT RIC 215 can monitor long-term trends and patterns of performance and employ AI / ML models to perform corrective actions through the SMO framework 205, such as via reconfiguration of Ol, or via creation of RAN management policies, such as Al policies.

[0064] FIG. 3 Aspects of example BS 102 and UE 104 are depicted.

[0065] Generally, BS 102 includes various processors (e.g., 320, 330, 338, and 340), antennas 334a-334t (collectively, 334), transceivers 332a-332t (collectively, 332) including modems and demodulators, and other aspects that enable wireless transmission of data (e.g., data source 312) and wireless reception of data (e.g., data sink 339). For example, BS 102 can transmit and receive data between BS 102 and UE 104. BS 102 includes a controller / processor 340 that can be configured to implement various functions described herein related to wireless communication.

[0066] Generally, UE 104 includes various processors (e.g., 358, 364, 366, and 380), antennas 352a-352r (collectively, 352), transceivers 354a-354r (collectively, 354) including modems and demodulators, and other aspects that enable wireless transmission of data (e.g., retrieved from data source 362) and wireless reception of data (e.g., provided to data sink 360). UE 104 includes a controller / processor 380 that can be configured to implement various functions described herein related to wireless communication.

[0067] With respect to example downlink transmission, BS 102 includes a transmit processor 320 that can receive data from a data source 312 and control information from a controller / processor 340. The control information can be for a physical broadcast channel (PBCH), a physical control format indicator channel (PCFICH), a physical HARQ indicator channel (PHICH), a physical downlink control channel (PDCCH), a group common PDCCH (GC PDCCH), and / or other. In some examples, the data can be for a physical downlink shared channel (PDSCH).

[0068] The transmit processor 320 can process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. The transmit processor 320 can also generate reference symbols, such as for the primary synchronization signal (PSS), secondary synchronization signal (SSS), PBCH demodulation reference signal (DMRS), and channel state information reference signal (CSI-RS).

[0069] A transmit (TX) multiple-input multiple-output (MIMO) processor 330 can perform spatial processing (e.g., precoding) on data symbols, control symbols, and / or reference symbols, if applicable, and can provide output symbol streams to modulators (MODs) in transceivers 332a-332t. Each modulator in transceivers 332a-332t can process a respective output symbol stream to obtain an output sample stream. Each modulator can further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. Downlink signals from modulators in transceivers 332a-332t can be transmitted via antennas 334a-334t, respectively.

[0070] To receive downlink transmissions, UE 104 includes antennas 352a-352r, which can receive downlink signals from BS 102 and can provide received signals to demodulators (DEMODs) in transceivers 354a-354r, respectively. Each demodulator in transceivers 354a-354r can condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator can further process the input samples to obtain received symbols.

[0071] A MIMO detector 356 can obtain received symbols from all demodulators in transceivers 354a-354r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 358 can process (e.g., demodulate, deinterleave, and decode) the detected symbols, providing decoded data for UE 104 to a data sink 360, and provide decoded control information to a controller / processor 380.

[0072] With respect to example uplink transmissions, UE 104 also includes a transmit processor 364, which can receive and process data (e.g., for the PUSCH) from a data source 362 and control information (e.g., for the physical uplink control channel (PUCCH)) from the controller / processor 380. Transmit processor 364 can also generate reference symbols for a reference signal (e.g., for the sounding reference signal (SRS)). Symbols from transmit processor 364 can be precoded by a TX MIMO processor 366 if applicable, further processed (e.g., for SC-FDM) by modulators in transceivers 354a-354r, and transmitted to BS 102.

[0073] At the BS 102, the uplink signals from the UE 104 can be received by antennas 334a-t, processed by demodulators in transceivers 332a-332t, detected by a MIMO detector 336 if applicable, and further processed by a receive processor 338 to obtain decoded data and control information transmitted by the UE 104. The receive processor 338 can provide the decoded data to a data sink 339 and to the controller / processor 340.

[0074] The memory 342 and the memory 382 can store data and program codes for the BS 102 and the UE 104, respectively.

[0075] The scheduler 344 can schedule UEs for data transmission on the downlink and / or uplink.

[0076] In various aspects, the BS 102 can be described as transmitting and receiving various types of data associated with the methods described herein. In these contexts, “transmitting” can refer to various mechanisms of outputting data, such as from the data source 312, the scheduler 344, the memory 342, the transmit processor 320, the controller / processor 340, the TX MIMO processor 330, the transceivers 332a-332t, the antennas 334a-334t, and / or other aspects described herein. Similarly, “receiving” can refer to various mechanisms of obtaining data, such as from the antennas 334a-334t, the transceivers 332a-332t, the RX MIMO detector 336, the controller / processor 340, the receive processor 338, the scheduler 344, the memory 342, and / or other aspects described herein.

[0077] In various aspects, the UE 104 can likewise be described as transmitting and receiving various types of data associated with the methods described herein. In these contexts, “transmitting” can refer to various mechanisms of outputting data, such as from the data source 362, the memory 382, the transmit processor 364, the controller / processor 380, the TX MIMO processor 366, the transceivers 354a-354t, the antennas 352a-352t, and / or other aspects described herein. Similarly, “receiving” can refer to various mechanisms of obtaining data, such as from the antennas 352a-352t, the transceivers 354a-354t, the RX MIMO detector 356, the controller / processor 380, the receive processor 358, the memory 382, and / or other aspects described herein.

[0078] In some aspects, the processor can be configured to perform various operations, such as those associated with the methods described herein, and send (output) data to or receive (obtain) data from another interface configured to send or receive data, respectively.

[0079] FIG. 4A , FIG. 4B , FIG. 4C and FIG. 4D depict aspects of data structures for a wireless communication network, such as the wireless communication network 100 of FIG. 1 .

[0080] In particular, FIG. 4A is a diagram 400 illustrating an example of a first subframe within a 5G (e.g., 5G NR) frame structure, FIG. 4B is a diagram 430 illustrating an example of DL channels within a 5G subframe, FIG. 4C is a diagram 450 illustrating an example of a second subframe within a 5G frame structure, and FIG. 4D is a diagram 480 illustrating an example of UL channels within a 5G subframe.

[0081] A wireless communication system can utilize orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) on the uplink and downlink. Such a system can also support half-duplex FIG. 4B and FIG. 4D The system bandwidth is partitioned into multiple orthogonal subcarriers. Each subcarrier can be modulated with data. Modulation symbols can be transmitted on the frequency domain with OFDM and / or on the time domain with SC-FDM.

[0082] A wireless communication frame structure can be frequency division duplex (FDD) in which a set of particular subcarriers are dedicated for DL or UL within the set of subcarriers. A wireless communication frame structure can also be time division duplex (TDD) in which a set of particular subcarriers are dedicated for both DL and UL within the set of subcarriers.

[0083] In FIG. 4A and FIG. 4CIn some aspects, the wireless communication frame structure is TDD, where D is DL, U is UL, and X is flexibly used between DL / UL. A UE can be configured with a slot format (dynamically configured by a DL control information (DCI) or semi-statically / statically configured by radio resource control (RRC) signaling) through a received slot format indicator (SFI). In the depicted example, a 10 ms frame is divided into 10 equal sized 1 ms subframes. Each subframe can include one or multiple slots. In some examples, each slot can include 7 or 14 symbols, depending on the slot format. A subframe can also include mini-slots, which generally have fewer symbols than a whole slot. Other wireless communication technologies can have different frame structures and / or different channels.

[0084] In certain aspects, the number of slots within a subframe is based on a slot configuration and a numerology. For example, for slot configuration 0, different numerologies (μ) 0 to 5 allow for 1, 2, 4, 8, 16, and 32 slots per subframe, respectively. For slot configuration 1, different numerologies 0 to 2 allow for 2, 4, and 8 slots per subframe, respectively. Thus, for slot configuration 0 and numerology μ, there are 14 symbols / slot and 2μ slots / subframe. The subcarrier spacing and symbol length / duration are a function of the numerology. The subcarrier spacing can equal kHz, where μ is a numerology 0 to 5. Thus, numerology has a subcarrier spacing of 15 kHz, and numerology has a subcarrier spacing of 480 kHz. The symbol length / duration is inversely related to the subcarrier spacing. FIG. 4A 、 FIG. 4B 、 FIG. 4C and FIG. 4D provides an example of slot configuration 0 with 14 symbols per slot and numerology with 4 slots per subframe. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μβ.

[0085] As FIG. 4A 、 FIG. 4B 、 FIG. 4C and FIG. 4D depicted, a resource grid can be used to represent the frame structure. Each time slot includes a resource block (RB) (also referred to as a physical RB (PRB)) that extends, for example, 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0086] As FIG. 4A illustrated, some of the REs carry control information (such as resource assignment and transmission format information) associated with the various data channels (such as FIG. 1 and FIG. 3The reference (pilot) signal (RS) for the UE (104) may include a demodulation RS (DMRS) and / or a channel state information reference signal (CSI-RS) for channel estimation at the UE. The RS may also include a beam measurement RS (BRS), a beam refinement RS (BRRS), and / or a phase tracking RS (PT-RS).

[0087] FIG. 4B Examples of various DL channels within a subframe of a frame are illustrated. The Physical Downlink Control Channel (PDCCH) carries the DCI within one or more Control Channel Elements (CCEs), each CCE comprising, for example, nine RE groups (REGs), each REG comprising, for example, four consecutive REs in an OFDM symbol.

[0088] The Primary Synchronization Signal (PSS) can be located within symbol 2 of a specific subframe of the frame. The PSS is generated by the UE (e.g., FIG. 1 and FIG. 3 104) is used to determine subframe / symbol timing and physical layer identifier.

[0089] The secondary synchronization signal (SSS) can be located within symbol 4 of a specific subframe of a frame. The SSS is used by the UE to determine the physical layer cell identification group number and radio frame timing.

[0090] Based on the Physical Layer Identifier and Physical Layer Cell Identifier Group Number, the UE can determine the Physical Cell Identifier (PCI). Based on the PCI, the UE can determine the location of the aforementioned DMRS. The Physical Broadcast Channel (PBCH), carrying the Master Information Block (MIB), can be logically grouped with the PSS and SSS to form a Synchronization Signal (SS) / PBCH block. The MIB provides the number of RBs and the System Frame Number (SFN) in the system bandwidth. The Physical Downlink Shared Channel (PDSCH) carries user data, broadcast system information (such as System Information Block (SIB)) not transmitted via the PBCH, and / or paging messages.

[0091] like FIG. 4C As illustrated, some REs in the REs carry DMRS for channel estimation at the base station (indicated as R for a particular configuration, but other DMRS configurations are possible). The UE can transmit DMRS for PUCCH and DMRS for PUSCH. PUSCH DMRS can be transmitted, for example, in the first or second symbol before the PUSCH. PUCCH DMRS can be transmitted in different configurations depending on whether a short or long PUCCH is being transmitted and depending on the specific PUCCH format used. UE104 can transmit a Sounding Reference Signal (SRS). SRS can be transmitted, for example, in the last symbol of a subframe. SRS can have a comb structure, and the UE can transmit SRS on one of the comb teeth. SRS can be used by the base station for channel quality estimation to enable frequency-dependent scheduling of the UL.

[0092] FIG. 4D Examples of various UL channels within a subframe of a frame are illustrated. The PUCCH can be located as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, channel quality indicator (CQI), precoding matrix indicator (PMI), rank indicator (RI), and HARQ ACK / NACK feedback. The PUSCH carries data, and can additionally be used to carry buffer status reports (BSR), power headroom reports (PHR), and / or UCI.

[0093] QCL ports and TCI states

[0094] In many cases, it is important for a UE to know which assumptions it can make about the channel corresponding to different transmissions. For example, the UE can need to know which reference signals it can use to estimate the channel in order to decode a transmitted signal (e.g., PDCCH or PDSCH). It can also be important for the UE to be able to report relevant channel state information (CSI) to the BS (gNB) for scheduling, link adaptation, and / or beam management purposes. In NR, the concepts of quasi-co-location (QCL) and transmission configuration indicator (TCI) states are used to convey information about these assumptions.

[0095] QCL assumptions are generally defined in terms of channel properties. According to 3GPP TS 38.214, “two antenna ports are said to be quasi co-located if properties of the channel over which a symbol on one antenna port is conveyed can be inferred from the channel over which a symbol on the other antenna port is conveyed.” Different reference signals can be considered to be quasi co-located (“in QCL”) if a receiver (e.g., a UE) can apply channel properties determined by detecting a first reference signal to help detect a second reference signal. A TCI state generally includes a configuration such as a QCL relationship (e.g., between a DL RS in one CSI-RS set and a PDSCH DMRS port).

[0096] In some cases, a UE can be configured with up to M TCI states. The configuration of the M TCI states can be via higher layer signaling while the UE can be signaled to decode a PDSCH according to a detected PDCCH with DCI indicating one of the TCI states. Each configured TCI state can include one RS set TCI- RS-SetConfig indicating different QCL assumptions between certain source signals and a target signal.

[0097] For example, a TCI-RS-SetConfig can indicate that a source reference signal (RS) is indicated in the top block and is associated with a target signal indicated in the bottom block. In this context, a target signal generally refers to a signal for which channel properties can be inferred by measuring those channel properties for the associated source signal. As mentioned above, a UE can use the source RS to determine various channel parameters depending on the associated QCL type, and use those various channel properties (determined based on the source RS) to process the target signal. The target RS does not necessarily need to be the DMRS of PDSCH, but it can be any other RS: PUSCH DMRS, CSI-RS, TRS, and SRS.

[0098] Each TCI-RS-SetConfig can contain various parameters. For example, these parameters can configure the quasi-co-location relationship(s) between the reference signals in the RS set and the DM-RS port group of PDSCH. The RS set contains a reference to one or two DL RSs and an associated quasi-co-location type (QCL-Type) for each DL RS configured by the higher layer parameter QCL-Type.

[0099] For the case of two DL RSs, the QCL types can take various arrangements. For example, the QCL types can not be the same, whether the same DL RS or different DL RSs are referenced. In the example illustrated, an SSB is associated with Type C QCL for P-TRS, while a CSI-RS for beam management (CSI RS-BM) is associated with Type D QCL.

[0100] In some scenarios, the QCL information and / or type can depend on or be a function of other information. For example, the quasi-co-location (QCL) type indicated to the UE can be based on the higher layer parameter QCL-Type and can take one or a combination of the following types:

[0101] QCL-Type A: {Doppler shift, Doppler spread, average delay, delay spread},

[0102] QCL-Type B: {Doppler shift, Doppler spread},

[0103] QCL-Type C: {average delay, Doppler shift}, and

[0104] QCL-Type D: {spatial Rx parameters},

[0105] A spatial QCL assumption (QCL-Type D) can be used to help the UE select an analog Rx beam (e.g., during a beam management procedure). For example, an SSB resource indicator can indicate that the same beam used for a previous reference signal should be used for a subsequent transmission.

[0106] An initial CORESET in NR (e.g., CORESET ID 0 or simply CORESET#0) can be identified during initial access by a UE (e.g., via a field in the MIB). A control resource set information element (CORESET IE) conveyed via radio resource control (RRC) signaling can convey information about CORESETs configured for a UE. The CORESET IE generally includes a CORESET ID, an indication of frequency domain resources (e.g., number of RBs) assigned to the CORESET, a contiguous time duration of the CORESET in number of symbols, and a transmission configuration indicator (TCI) state.

[0107] As mentioned above, a subset of TCI states provides a quasi-co-location (QCL) relationship between DL RSs in a set of RSs (e.g., a TCI set) and PDCCH demodulation RS (DMRS) ports. A particular TCI state for a given UE (e.g., for unicast PDCCH) can be conveyed to the UE by a medium access control (MAC) control element (MAC-CE). The particular TCI state is generally selected from a set of TCI states conveyed by the CORESET IE, where the initial CORESET (CORESET#0) is generally configured via the MIB.

[0108] Overview of discontinuous communications

[0109] As mentioned above, to reduce power consumption, a network entity (e.g., a base station (BS) or gNB) or a UE can be configured for some type of cell discontinuous communication. For example, a UE can be configured for a discontinuous reception (DRX) mode during which the UE can enter a low power state because it does not need to monitor for downlink transmissions. Similarly, in a discontinuous transmission (DTX) mode, the network can not transmit and can save power.

[0110] As FIG. 5A illustrated by timing diagram 500, a UE in a DRX mode (e.g., connected DRX mode or CDRX) can cycle / alternate between an “active time” duration 502 and an “inactive” duration 504.

[0111] During the CDRX active time (or on-duration period), the UE continuously or periodically monitors Physical Downlink Shared Channel (PDSCH) activity, receives downlink data, transmits UL data, and / or performs serving cell or neighbor measurements. During the active time, the UE is typically considered "on," and various timers are running. For example, active duration timers (e.g., drx-onDurationTimer), inactive timers (drx-InactivityTimer), and full DRX cycle durations (e.g., drx-ShortCycle) can run during the active time. The start of a DRX cycle can be defined by a start offset value.

[0112] In these examples, the activity period is 10ms, and the CDRX cycle duration is 30ms. The UE can be configured with an inactivity timer (starting inactivity period 506), which restarts when activity is detected and expires after 5ms if no activity is detected. When the inactivity timer expires, the UE enters an "inactive" or "sleep" mode.

[0113] like FIG. 5B As illustrated in timing diagram 510, a network entity (e.g., a gNB) in DTX mode can cycle / alternate between an “on / active time” duration 512 and a “off / inactive time” duration 514.

[0114] When the gNB is active at 512, it is allowed to transmit. When inactive, the gNB does not need to transmit or receive certain periodic signals / channels, which allows network entities to conserve power. For example, when inactive, the gNB may not need to transmit or receive common channels / signals or user equipment (UE) specific signals / channels, and may not transmit / receive or only maintain limited transmission / reception.

[0115] DTX can be configured to achieve energy savings at the network level. DTX cycles can be configured semi-statically or dynamically, with the specific configuration typically determined by the data communication objective.

[0116] Overview of TRS configurations

[0117] like FIG. 6 As illustrated in Figure 600, a TRS (burst) can be configured as a CSI-RS resource set (configured with parameter trs-Info). A CSI-RS resource set can have 2 CSI-RS resources 602 in one time slot or 4 CSI-RS resources 604 in two consecutive time slots (2 CSI-RS resources per time slot).

[0118] Each of the CSI-RS resources in the CSI-RS resource set can be single ported and transmitted in the same bandwidth (BW) and on the same subcarriers / REs. Each CSI-RS resource can have a frequency domain (FD) density of 3 REs per RB.

[0119] Different types of TRSs can be configured, including periodic TRS (P-TRS) and aperiodic TRS (AP-TRS). For P-TRS, all of the 2 or 4 CSI-RS resources in the set can have the same periodicity, bandwidth, and frequency location. An AP-TRS configuration should have a corresponding P-TRS with the same bandwidth and frequency location and be quasi co-located (QCLed) with ‘QCL Type A’ or ‘QCL Type D’.

[0120] In certain systems, TRSs can be used only for DL tracking (depending on UE implementation) and can not be related to CSI reporting. Thus, for aperiodic NZP CSI-RS resource set configured with trs-Info, a UE can not expect to be configured with a CSI-ReportConfig with a higher layer parameter reportQuantity set to anything other than ‘none’. Furthermore, a UE can not expect to be configured with a CSI-ReportConfig for a periodic NZP CSI-RS resource set configured with trs-Info.

[0121] Aspects related to opportunistic transmission of periodic RS

[0122] Aspects of the disclosure provide apparatuses, methods, processing systems, and computer readable media for opportunistic transmission of reference signals (RSs).

[0123] As mentioned above, in certain wireless communication standards, a TRS is defined as a set of 4 single ported CSI-RS resources in 2 consecutive slots, or a set of 2 single ported CSI-RS resources in one single slot (e.g., this can be configured using a ‘true’ value of the trs-Info parameter (implementing tracking)). In such wireless communication standards, periodic TRSs only support periodicities of {10, 20, 40, 80} ms, which can not be suitable to support some target latency (e.g., lag) values (e.g., {4 symbols, 1 slot, 2 slots, 3 slots, 4 slots, 5 slots, 6 slots, 10 slots}). For example, using the supported periodicities, only {4 symbols, 1 slot} can be supported within a TRS.

[0124] Aspects of the disclosure provide techniques including multiple CSI-RS resource sets configured for time domain channel property (TDCP) reporting, where the offset between two resource sets can be a target delay (lag). In some aspects, at least one CSI-RS resource set can be a TRS to leverage existing resources.

[0125] To save overhead, for example, resource set #2 (or #3, #4, etc.) can have a longer periodicity than set #1 (assuming TRS is set #1). The longer periodicity of set #2 can be an integer multiple of the periodicity of set #1, as TDCP can not need to be updated frequently.

[0126] In some aspects, a resource set other than set #1 (TRS) can contain fewer CSI-RS resources (e.g., 2, or even 1) than a TRS. In some aspects, a resource set other than set #1 (TRS) can not be defined as a TRS. For example, a resource set other than set #1 can be a set of special single-port CSI-RS with a frequency density of 3 resource elements (REs) per resource block (RB).

[0127] In some cases, all CSI-RS resources in all sets for TDCP reporting can be QCLed (e.g., using QCL-TypeA and / or QCL-TypeD). Otherwise, self-correlation can not be able to be derived based on the CSI-RS.

[0128] In some cases, periodicity and / or semi-persistent CSI-RS can be configured in a CSI report configuration (e.g., CSI-ReportConfig) with a reportQuantity parameter including a rank indicator (RI) for the CSI report.

[0129] In some cases, different time references can be used for periodic RS and aperiodic RS. For example, periodic RS can use absolute time (e.g., system frame number, periodicity, offset, etc.) while aperiodic RS can use downlink control information (DCI) slot and trigger offset. This can lead to issues with meeting a configured lag.

[0130] In certain wireless communication standards, some network energy saving (NES) considerations do not include TDCP RS. For example, TDCP reporting can not contain RI (e.g., only CSI-RS reporting can include RI). Additionally, TRS with certain reporting configurations or TDCP reporting configurations can have different UE / cell behavior during cell discontinuous transmission (DTX).

[0131] FIG. 7An example slot allocation 700 including two resource sets is depicted in accordance with certain aspects of the present disclosure. As illustrated, for example, a first set of resources (set #1) associated with TRSs can be configured with a certain periodicity (e.g., 10 milliseconds (ms)). As illustrated, a second set of resources (set #2) can be configured with a certain periodicity (e.g., 40 ms). As mentioned above, and as illustrated in this example, the periodicity of set #2 can be an integer multiple of the periodicity of set #1 (e.g., 10 ms * 4 = 40 ms).

[0132] As illustrated, there can be an offset or target delay (e.g., hysteresis) between these resource sets. In some aspects, a time correlation metric can be calculated based on these resource sets and / or the hysteresis between these resource sets.

[0133] Aspects of the present disclosure provide techniques for opportunistic RS transmission with resource sets of periodic RS resources. Certain time correlation metrics can be calculated based on measurements of periodically transmitted RSs and opportunistically transmitted RSs, which can enable improved TDCP reporting indicative of the time correlation metrics.

[0134] FIG. 8 A call flow diagram 800 for opportunistic RS transmission for TDCP reporting in accordance with certain aspects of the present disclosure is depicted.

[0135] In some aspects, FIG. 8 The illustrated UE can be an example of the UE 104 described with reference to FIG. 1 and FIG. 3 The illustrated network entity can be an example of the BS 102 (e.g., gNB) described with reference to FIG. 8 and FIG. 1 The illustrated network entity can be an example of the BS 102 (e.g., gNB) described with reference to FIG. 3 and FIG. 2 The illustrated network entity can be an example of the disaggregated base station described with reference to

[0136] As illustrated at 802, the network entity can configure the UE with a first set of RS resources (set #1) for periodically transmitting RSs and at least a second set of periodic RS resources (set #2) for opportunistically transmitting RSs. For example, as in the illustrated example, set #1 and set #2 can be configured with different periodicities. FIG. 7

[0137] As illustrated, initially, RSs can only be transmitted in the transmission occasions of set #1. RS transmissions on set #2 can be referred to as opportunistic because they only occur under certain conditions, unlike the (relatively specific) RS transmissions that occur in every transmission occasion on set #1. Set #1

[0138] ​As illustrated at 804, the network entity can transmit a PDCCH indicating when the RS will be (opportunistically) transmitted in the transmission occasion of Set #2. As shown, for example, the network entity can transmit the RS associated with Set #2 in accordance with the indication.

[0139] As illustrated at 806, the UE can calculate a time correlation metric based on the RS transmitted in Set #2 and the RS transmitted in Set #1. The UE can then transmit a report (e.g., TDCP report) to the network entity including the time correlation metric.

[0140] According to certain aspects of the present disclosure, for a plurality (e.g., K>1) of sets of periodic single-port CSI-RS resources configured for TDCP reporting (e.g., with Set #1 being a TRS), at least one of the remaining K-1 sets can be transmitted opportunistically. For example, assuming RS is transmitted on Set #1 with some degree of certainty, RS can be transmitted on the remaining K-1 sets (Set 2 through Set K) opportunistically.

[0141] According to a first option (Option 1), the UE can assume that RS is not transmitted opportunistically unless triggered. For example, with DTX enabled by default, the K-1 sets of resources can be transmitted based on a dynamic trigger (e.g., TDCP report trigger DCI). In other words, without at least one triggering event, the UE can assume that the K-1 sets are not transmitted (and need not monitor for RS in the transmission occasions of these sets unless triggered).

[0142] According to a second option (Option 2), RS can be transmitted opportunistically on one or more sets by default. For example, with RS transmitted on the K-1 sets of resources by default, the K-1 sets of resources can not be transmitted based on a cell DTX semi-static configuration or dynamic trigger (e.g., semi-static or dynamic “muted”). In other words, without a configuration or triggering event, the UE can assume that the K-1 sets are transmitted.

[0143] In either case, the potential occasions of the K-1 sets of resources can be determined by a delay (hysteresis) configured with the TDCP report, as will be described in greater detail below. According to certain aspects, the remaining K-1 sets can each be configured with a (e.g., same) periodicity that is an integer (e.g., 1, 2, 4, 8) multiple of the periodicity of Set #1 Set #1 TRS. In FIG. 7 In the illustrated example, the periodicity of Set #2 is 40 ms, which is 4 times the 10 ms periodicity of Set #1.

[0144] According to certain aspects, certain cell DTX behavior for TDCP RS other than Set #1 (e.g., TRS) can only apply to Option 2 (e.g., where K-1 resource sets are transmitted by default). For example, in some aspects, if cell DTX is semi-statically configured or dynamically triggered (e.g., for the duration of the cell DTX inactive duration), the other sets can not be transmitted (e.g., the UE can assume network unavailability).

[0145] According to certain aspects, certain cell DTX behavior for Set #1 (TRS) of TDCP can apply to Option 2 and / or Option 1 (where DTX is default). For example, in some aspects, if cell DTX is semi-statically configured or dynamically triggered (e.g., for the duration of the cell DTX inactive duration), Set #1 (TRS) can not be transmitted. In other words, in this case, Set #1 (TRS) is also transmitted opportunisticly. In such cases, the UE can assume network unavailability.

[0146] A third option (Option 3) can be considered a hybrid approach, e.g., where Option 1 and Option 2 work in a “layered” manner. For example, Option 2 can work as a “mute mask” for the cell DTX inactive duration (e.g., a first “layer”), and Option 1 can work on top of the cell DRX for “unmute” occasions (thus a second “layer”). In other words, in Option 3, Option 1 can define UE / cell behavior outside of the cell DTX inactive duration.

[0147] FIG. 9A An example slot allocation 900A including 3 resource sets that can allow for opportunistic RS transmission is depicted in accordance with certain aspects of the present disclosure.

[0148] As FIG. 9A illustrated, a first resource set (Set #1) associated with TRS can be configured with a certain periodicity (e.g., 10 ms). As illustrated, a second resource set (Set #2) can be configured with a certain periodicity (e.g., 40 ms) of potential transmission occasions (for opportunistic RS transmission). As illustrated, a third resource set (Set #3) can be configured with a certain periodicity (e.g., 40 ms) of potential transmission occasions.

[0149] As illustrated, there can be an offset or target delay (e.g., hysteresis) between Set #1 and each of Set #2 and Set #3 (e.g., labeled as hysteresis 1 and hysteresis 2, respectively). In some aspects, a time correlation metric can be computed based on one or more of the resource sets and / or at least one of the hysteresis.

[0150] While FIG. 9AA scenario is illustrated in which the occasion of Set #1 is earlier than the potential occasions of the other K-1 sets (e.g., each of Set #2 and Set #3), but FIG. 9B An alternative scenario 900B is illustrated in which the potential occasions of the other K-1 sets (e.g., Set #2 and / or Set #3) can be earlier than the occasion of Set #1. For example, as illustrated in FIG. 9B Set #3 can occur, the potential occasion of Set #2 can occur before the occasion of Set #1. As illustrated, in this scenario, the hysteresis can be similarly calculated based on the offset / target delay between Set #1 and each of Set #2 and Set #3 (e.g., labeled as Hyst 1 and Hyst 2, respectively).

[0151] An opportunistic transmission for one of these sets can be triggered depending on the particular hysteresis for which a TDCP report is desired. For example, as illustrated in FIG. 10A Set #2 can be triggered for the UE to report the time correlation metric for Hyst 1. As illustrated in FIG. 10B Set #3 can be triggered for the UE to report the time correlation metric for Hyst 2, as illustrated in

[0152] In some cases, the opportunistic RS transmission can be triggered (indicated) via a physical downlink control channel (PDCCH) transmission. For example, FIG. 11A Timeline 1100A depicts a PDCCH triggering an opportunistic RS transmission, in accordance with certain aspects of the present disclosure.

[0153] In some aspects, the reporting trigger PDCCH (e.g., which can be a UL grant DCI) can be transmitted prior to a particular RS transmission occasion of Set #1 (e.g., TRS). As FIG. 11A illustrated, for example, the PDCCH is transmitted at least a lower threshold value prior to the transmission occasion of Set #1, which triggers reporting for at least one of Set #2 or Set #3.

[0154] In some cases, the behavior for TRS reception can be up to the UE. For example, if the UE decides to receive the TRS occasion for DL tracking, it can be advantageous for the UE to have time to know / determine that additional effort can be needed for TDCP related computation and reporting can be advantageous. If the UE decides not to receive the TRS occasion for DL tracking (e.g., if the UE determines that the reception is not necessary), it can still be advantageous for the UE to have time to prepare for reception (e.g., turn on the DL RF chain, start DL buffering, etc.).

[0155] According to certain aspects, a lower threshold gap can be needed for the timing between PDCCH and the first RS for TDCP reporting (e.g., PDCCH to Set #1). As FIG. 11A illustrated, for example, the lower threshold can be based on K0 min , which can be defined as the minimum PDCCH-to-CSI-RS slot offset. K0 min may generally apply to AP-CSI-RS, but here to an aperiodic TDCP CSI-RS. In some cases, K0 min may be defined for UE power saving.

[0156] According to certain aspects, an upper threshold gap can also be needed for PDCCH to Set #1. In some aspects, the lack of an upper threshold gap can result in ambiguity as to which occasion of the periodic Set #1 (TRS) and / or PDCCH is associated with. In other words, the UE can not know which RS to use for TDCP reporting. As FIG. 11A illustrated, for example, the upper threshold can be determined by the periodicity of Set #1 (TRS). For example, in some aspects, the upper threshold can be based on the periodicity of Set #1. For example, the upper threshold can be equal to T set#1 or T set#1 + K0 min .

[0157] In some aspects, as illustrated in example 1100B of FIG. 11B , in scenarios where the potential occasion of one or more of the other K-1 sets (e.g., Set #2 and / or more sets) can be earlier than the occasion of Set #1, a report triggering PDCCH can be used. In some cases, this can be a set order requirement. In other words, in some aspects, one or more of the other K-1 sets occurring earlier than the Set #1 TRS can be a requirement.

[0158] In such cases, similar to the scenarios illustrated in FIG. 11A , for PDCCH to Set #X, the lower threshold gap and / or the upper threshold gap can be satisfied. In some aspects, the lower threshold can be similarly based on K0 min (which generally applies to AP-CSI-RS, but here to an opportunistic periodic TDCP CSI-RS). In some aspects, the upper threshold can be determined based on the periodicity of a given set (e.g., Set #2 or Set #3). For example, the upper threshold can be equal to T set#X or T set#X + K0 min . In some aspects, Set #X (e.g., Set #2 or Set #3) can correspond to the maximum delay (hysteresis) configured for TDCP reporting.

[0159] As mentioned above, in some cases, the slots in which the periodic CSI-RS is transmitted can be defined in an “absolute” manner by system frame number (SFN) as:

[0160] where

[0161] is the number of slots in a frame, such that, for example, for subcarrier spacing (SCS) of {15, 30, 60, 120, 240} kHz,

[0162] ={10, 20, 40, 80, 160};

[0163] is a set, such that:

[0164]

[0165] is the SFN, such that:

[0166] and

[0167] and may be obtained from the RRC parameter CSI-ResourcePeriodicityAndOffset.

[0168] In some aspects, the periodicity and offset of different resource sets can be represented as: and , respectively.

[0169] In some aspects, for set #1 (TRS) with the smallest periodicity, every m-th periodicity of this set may be represented as within a larger periodicity associated with the TDCP report. In certain scenarios (e.g., the scenario illustrated by FIG. 11A ):

[0170] where

[0171] satisfies

[0172] .

[0173] In certain scenarios (e.g., the scenario illustrated by FIG. 11B ):

[0174] where

[0175] , satisfying

[0176] .

[0177] In certain scenarios (e.g., the scenario illustrated by FIG. 11A The lag can determine potential occasions for various sets (e.g., Set #2, Set #3, etc.) according to the following equation:

[0178] ; and

[0179] ;

[0180] This can be generalized as:

[0181]

[0182] where K is the total number of resource sets for TDCP.

[0183] Alternatively, in certain scenarios (e.g., the scenario illustrated by FIG. 11B The lag can determine potential occasions for various sets (e.g., Set #2, Set #3, etc.) according to the following equation:

[0184] ; and

[0185] ;

[0186] This can be generalized as:

[0187] ;

[0188] where K is the total number of resource sets for TDCP.

[0189] In some cases, the delay (e.g., lag) from the triggering PDCCH to reporting PUSCH can be too long (e.g., > 10 slots) even without considering the PDCCH to Set #1 gap and / or CSI processing timeline (e.g., Z’ symbols).

[0190] According to certain aspects of the present disclosure, a 2-stage PDCCH can be used, as illustrated by diagram 1200A of FIG. 12A For example, as illustrated, PDCCH1 can still be a UL grant (e.g., similar to the above reference FIG. 11A / FIG. 11BPDCCH), but can only trigger transmission of TDCP measurements and potential occasions of Set #2 (e.g., or Set #3, etc.). In other words, in some aspects of the 2-stage PDCCH, PDCCH1 can not trigger a TDCP report, as illustrated. In such cases, PDCCH1 can still schedule a PUSCH that is not a TDCP report (this is not illustrated in FIG. 12A ).

[0191] According to certain aspects, PDCCH1 can still be transmitted before a certain occasion of Set #1, and can still need to satisfy the lower threshold gap and / or the upper threshold gap as described above with reference to FIG. 11A and / or FIG. 11B According to certain aspects, PDCCH1 can still be transmitted before a certain occasion of Set #1, and can still need to satisfy the lower threshold gap and / or the upper threshold gap as described above with reference to FIG. 11A and / or FIG. 11B According to certain aspects, PDCCH1 can still be transmitted before a certain occasion of Set #1, and can still need to satisfy the lower threshold gap and / or the upper threshold gap as described above with reference to

[0192] According to certain aspects, a second PDCCH (PDCCH2) can be used to trigger a PUSCH (e.g., another PUSCH) to convey a TDCP report. In some aspects, PDCCH2 and / or PDCCH1 can need to indicate the same AP report trigger state.

[0193] In some aspects, as FIG. 12A illustrated, the gap / distance from PDCCH1 to PDCCH2 can need to be less than a (upper) threshold gap. Without such a gap / threshold, PDCCH2 can be a new TDCP measurement trigger for PDCCH1.

[0194] In some aspects, as FIG. 12B illustrated in diagram 1200B of FIG. 12, in scenarios where potential occasions of one or more of the other K-1 sets (e.g., Set #2 and / or more sets) can be earlier than the occasions of Set #1, a two-stage DCI can be used. In such scenarios, PDCCH1 can occur before Set #2, and can trigger transmission of TDCP measurements and potential occasions of Set #2, as illustrated. In such cases, PDCCH1 can still schedule a PUSCH that is not a TDCP report (this is not illustrated in FIG. 12B ).

[0195] PDCCH2 can be used to trigger a PUSCH (e.g., another PUSCH) to convey a TDCP report. In some aspects, as FIG. 12B illustrated, the gap / distance from PDCCH1 to PDCCH2 can need to be less than a (upper) threshold gap.

[0196] FIG. 13An example structure 1300 of a channel state information (CSI) measurement configuration is depicted in accordance with certain aspects of the present disclosure.

[0197] As illustrated, the CSI measurement configuration IE (CSI-MeasConfig) can include a CSI-AperiodicTriggerStateList IE, which can be used to configure the UE with a list of aperiodic trigger states. In some cases, each codepoint of the DCI field “CSI request” can be associated with one trigger state. Upon receiving a value associated with a trigger state, the UE can perform measurements on CSI-RS, CSI-IM, and / or SSB (reference signals) at L1 and / or aperiodic reporting according to all entries in the associatedReportConfigInfoList IE for that trigger state.

[0198] As illustrated, the CSI-MeasConfig can include a CSI reporting configuration (e.g., a CSI-ReportConfig field), which can include a reportQuantity parameter indicating the CSI-related quantities to be reported. The CSI-ReportConfig field can also include a tdcpDelayValueList field, which can define various lag / delay durations (e.g., in terms of slots).

[0199] As FIG. 13 illustrated, the CSI-MeasConfig can include a CSI resource configuration (e.g., a CSI-ResourceConfig), which can indicate at least a resource type (e.g., periodic or aperiodic).

[0200] As FIG. 13 illustrated, the CSI-MeasConfig can include various resource sets (e.g., in NZP-CSI-RS-ResourceSet fields), including one or more of Set #1, Set #2, Set #3, etc., as described above and can relate to triggering measurements on RS transmitted in the various resource sets. For example, as mentioned above, a trs-Info parameter can be set to “true” to configure Set #1. Additionally, as mentioned above, an aperiodicTriggeringOffset field can define an offset X between the slot containing the DCI triggering the aperiodic NZP CSI-RS resource set and the slot in which the CSI-RS resource set is transmitted. For example, a value of 0 can correspond to 0 slots, a value of 1 can correspond to 1 slot, a value of 2 can correspond to 2 slots, etc. When this field is not present, the UE can apply a value of 0.

[0201] As FIG. 13The illustrated CSI-MeasConfig can include various resources (e.g., which constitute Resource Set Set #1, Set #2, Set #3, etc.). These various resources can be defined, for example, in the NZP-CSI-RS-Resource field, which can include at least a field (e.g., a periodicityAndOffset field) that defines a periodicity and a slot offset (e.g., a periodicity associated with the various resources / resource sets and an offset associated with the various lag / delay durations). The corresponding offset can be defined, for example, by a number of slots.

[0202] Example operations

[0203] FIG. 14 A method 1400 of wireless communication is shown, for example, at a user equipment (UE), such as a UE 104. FIG. 1 and FIG. 3 A method 1400 of wireless communication is shown, for example, at a user equipment (UE), such as a UE 104.

[0204] The method 1400 begins, at 1405, where first signaling is received that configures the UE with a first set of reference signal (RS) resources for periodically transmitting RSs and at least a second set of periodic RS resources for opportunistically transmitting RSs. In some cases, the operations of this step refer to the receiving circuitry and / or code for receiving described with reference to FIG. 16 or can be performed by the same.

[0205] The method 1400 then proceeds to 1410, where second signaling is received that indicates when RSs will be transmitted in transmission occasions of the second set of RS resources. In some cases, the operations of this step refer to the receiving circuitry and / or code for receiving described with reference to FIG. 16 or can be performed by the same.

[0206] The method 1400 then proceeds to 1415, where a time correlation metric is calculated based on measurements of RSs transmitted in the transmission occasions of the second set of RS resources according to the second signaling and measurements of RSs transmitted in transmission occasions of the first set of RS resources. In some cases, the operations of this step refer to the calculating circuitry and / or code for calculating described with reference to FIG. 16 or can be performed by the same.

[0207] The method 1400 then proceeds to 1420, where a report is transmitted that indicates the time correlation metric. In some cases, the operations of this step refer to the transmitting circuitry and / or code for transmitting described with reference to FIG. 16 or can be performed by the same.

[0208] In some aspects, the time correlation metric is a hysteresis for a time interval between the transmission occasion of the first set of RS resources and the transmission occasion of the second set of RS resources.

[0209] In some aspects, the at least second set of periodic RS resources comprises a plurality of sets of periodic RS resources; and the value of the hysteresis determines the transmission occasion of one set of the plurality of sets of periodic RS resources.

[0210] In some aspects, the first set of RS resources is configured with a first periodicity; and each set of the plurality of sets of periodic RS resources is configured with a periodicity that is an integer multiple of the first periodicity.

[0211] In some aspects, the method 1400 further includes determining the transmission occasion of the second set of RS resources for computing the time correlation metric based on the value of the hysteresis, a first offset associated with the first set of RS resources, a second offset associated with the second set of periodic RS resources, and the first periodicity. In some cases, the operations of this step refer to the circuitry for determining and / or code for determining as described with reference to FIG. 16

[0212] In some aspects, the second signaling comprises a first physical downlink control channel (PDCCH) that triggers reporting time correlation.

[0213] In some aspects, the UE is configured to compute the time correlation metric only when the PDCCH satisfies a timing requirement based on an offset between the PDCCH and the transmission occasion of the first set of RS resources.

[0214] In some aspects, the timing requirement specifies that the offset is at least one of: not less than a first threshold; and not greater than a second threshold, where the second threshold is greater than the first threshold.

[0215] In some aspects, the method 1400 further includes receiving a second PDCCH that triggers transmitting the report. In some cases, the operations of this step refer to the circuitry for receiving and / or code for receiving as described with reference to FIG. 16

[0216] In some aspects, the first PDCCH and the second PDCCH indicate a same aperiodic reporting trigger state.

[0217] In some aspects, an offset between the first PDCCH and the second PDCCH is less than or equal to a threshold.​​

[0218] In some aspects, the transmission occasion of the second set of RS resources is associated with a maximum value of a hysteresis.

[0219] In some aspects, the RS is not transmitted in the transmission occasion of the second set of RS resources during an inactive network discontinuous transmission (DTX) duration; and the second signaling indicates an active network DTX duration.

[0220] In some aspects, the RS is not transmitted in the transmission occasion of the first set of RS resources during an inactive network DTX duration.

[0221] In some aspects, the RS is not transmitted in the transmission occasion of the second set of RS resources during an inactive network discontinuous transmission (DTX) duration; and the second signaling includes a physical downlink control channel (PDCCH) indicating that the RS will be transmitted in the transmission occasion of the second set of RS resources during an active network DTX duration.

[0222] In one aspect, the method 1400, or any aspect related thereto, can be performed by a device, such as FIG. 16 the communication device 1600 of FIG. 13, that includes various components

[0223] Note that FIG. 14 The method of FIG. 14 is just one example. Other methods having fewer, additional, or alternative steps are possible as well and can be consistent with the present disclosure.

[0224] FIG. 15 An example of a method 1500 of wireless communication is shown occurring at a network entity, such as FIG. 1 the BS 102 of FIG. 1, or a disaggregated base station as discussed with respect to FIG. 3 FIG. 14. FIG. 2

[0225] The method 1500 begins, at 1505, by transmitting first signaling that configures a user equipment (UE) with a first set of reference signal (RS) resources for periodic transmission of RS and at least a second set of periodic RS resources for opportunistic transmission of RS. In some cases, the operations of this step are related to the circuitry for transmitting and / or code for transmitting described with respect to FIG. 16 or can be performed by the circuitry and / or code.

[0226] ​Then, the method 1500 proceeds to step 1510, where second signaling is transmitted, the second signaling indicating when RS will be transmitted in a transmission occasion of the second set of RS resources. In some cases, the operations of this step refer to the circuitry for transmitting and / or code for transmitting as described with reference to FIG. 16

[0227] Then, the method 1500 proceeds to step 1515, where a report indicating a time correlation metric is received, the time correlation metric being computed by the UE based on measurements of RS transmitted in the transmission occasion of the second set of RS resources in accordance with the second signaling and measurements of RS transmitted in transmission occasions of the first set of RS resources. In some cases, the operations of this step refer to the circuitry for receiving and / or code for receiving as described with reference to FIG. 16

[0228] In some aspects, the time correlation metric is a hysteresis for a time interval between the transmission occasion of the first set of RS resources and the transmission occasion of the second set of RS resources.

[0229] In some aspects, the at least second set of periodic RS resources comprises a plurality of sets of periodic RS resources; and the value of the hysteresis determines the transmission occasion of one set of the plurality of sets of periodic RS resources.

[0230] In some aspects, the transmission occasion of the second set of RS resources is associated with a maximum value of hysteresis.

[0231] In some aspects, the first set of RS resources is configured with a first periodicity; and each set of the plurality of sets of periodic RS resources is configured with a periodicity that is an integer multiple of the first periodicity.

[0232] In some aspects, the method 1500 further comprises determining the transmission occasion of the second set of RS resources for computing the time correlation metric based on: the value of the hysteresis, a first offset associated with the first set of RS resources, a second offset associated with the second set of periodic RS resources, and the first periodicity. In some cases, the operations of this step refer to the circuitry for determining and / or code for determining as described with reference to FIG. 16

[0233] In some aspects, the second signaling comprises a first physical downlink control channel (PDCCH) triggering reporting time correlation.

[0234] ​​​In some aspects, the UE is configured to calculate the time correlation metric only when the PDCCH satisfies a timing requirement based on an offset between the transmission occasion of the PDCCH and the first set of RS resources.

[0235] In some aspects, the timing requirement specifies that the offset is at least one of: not less than a first threshold; and not greater than a second threshold, where the second threshold is greater than the first threshold.

[0236] In some aspects, the method 1500 further includes transmitting a second PDCCH that triggers transmission of the report. In some cases, the operations of this step are performed by a transmitting circuitry and / or code for transmitting as described with reference to FIG. 16 or by the circuitry and / or code.

[0237] In some aspects, the first PDCCH and the second PDCCH indicate a same aperiodic reporting trigger state.

[0238] In some aspects, an offset between the first PDCCH and the second PDCCH is less than or equal to a threshold.

[0239] In some aspects, the RS is not transmitted in the transmission occasion of the second set of RS resources during an inactive network discontinuous transmission (DTX) duration; and the second signaling indicates an active network DTX duration.

[0240] In some aspects, the RS is not transmitted in the transmission occasion of the first set of RS resources during an inactive network DTX duration.

[0241] In some aspects, the RS is not transmitted in the transmission occasion of the second set of RS resources during an inactive network discontinuous transmission (DTX) duration; and the second signaling includes a physical downlink control channel (PDCCH) indicating that the RS will be transmitted in the transmission occasion of the second set of RS resources during an active network DTX duration.

[0242] In one aspect, the method 1500, or any aspect related thereto, can be performed by a device, such as the communication device 1600 of FIG. 16 that includes various components capable of operatingly, configured for, or adapted to perform the method 1500. The communication device 1600 is described in greater detail below.

[0243] Note that FIG. 15 The method is just one example, and other methods including fewer, additional, or alternative steps can also be consistent with the present disclosure.

[0244] Example communication devices

[0245] FIG. 16 Aspects of an example communications device 1600 are depicted. In some aspects, the communications device 1600 is a user equipment, such as the UEs 104 described above with respect to FIG. 1 and FIG. 3 In some aspects, the communications device 1600 is a network entity, such as the BS 102 of FIG. 1 and FIG. 3 or a disaggregated base station as discussed with respect to FIG. 2

[0246] The communications device 1600 includes a processing system 1605 coupled to a transceiver 1665 (e.g., a transmitter and / or a receiver). In some aspects, the processing system 1605 can be coupled to a network interface 1675 configured to obtain and transmit signals for the communications device 1605 via a communication link, such as a backhaul link, a midhaul link, and / or a front haul link as described herein (such as with respect to FIG. 2 ). The transceiver 1665 is configured to transmit and receive signals for the communications device 1600 via an antenna 1670, such as the various signals as described herein. The processing system 1605 can be configured to perform processing functions of the communications device 1600, including processing signals received by and / or to be transmitted by the communications device 1600.

[0247] The processing system 1605 includes one or more processors 1610. In various aspects, the one or more processors 1610 can represent one or more of the reception processor 358, the transmission processor 364, the TX MIMO processor 366, and / or the controller / processor 380, as described with respect to FIG. 3 . In various aspects, the one or more processors 1610 can represent one or more of the reception processor 338, the transmission processor 320, the TX MIMO processor 330, and / or the controller / processor 340, as described with respect to FIG. 3 . The one or more processors 1610 are coupled to a computer- readable medium / memory 1635 via a bus 1660. In certain aspects, the computer- readable medium / memory 1635 is configured to store instructions (e.g., computer-executable code) that, when executed by the one or more processors 1610, cause the one or more processors 1610 to perform: the method 1400 described with respect to FIG. 14 or any aspects related thereto; and the method 1500 described with respect to FIG. 15 or any aspects related thereto. Note that reference to a processor executing a function of the communications device 1600 can include one or more processors 1610 executing that function of the communications device 1600.​

[0248] In the depicted example, computer-readable media / memory 1635 stores code (e.g., executable instructions), such as code for receiving 1640, code for computing 1645, code for transmitting 1650, and code for determining 1655. Processing of code for receiving 1640, code for computing 1645, code for transmitting 1650, and code for determining 1655 can cause the communication device 1600 to perform, in conjunction with FIG. 14 the described method 1400 or any aspects related thereto; and in conjunction with FIG. 15 the described method 1500 or any aspects related thereto.

[0249] The one or more processors 1610 include circuitry configured to implement (e.g., to perform) code stored in the computer-readable medium / memory 1635, including code for receiving 1615, code for computing 1620, code for transmitting 1625, and code for determining 1630. Processing of code for receiving 1615, code for computing 1620, code for transmitting 1625, and code for determining 1630 can cause the communication device 1600 to perform, in conjunction with FIG. 14 the described method 1400 or any aspects related thereto; and in conjunction with FIG. 15 the described method 1500 or any aspects related thereto.

[0250] The various components of the communication device 1600 can provide means for performing: in conjunction with FIG. 14 the described method 1400 or any aspects related thereto; and in conjunction with FIG. 15 the described method 1500 or any aspects related thereto. For example, means for receiving or obtaining can comprise FIG. 3 the transceiver 354 and / or the antenna 352 of the UE 104 as illustrated, FIG. 3 the transceiver 332 and / or the antenna 334 of the BS 102 as illustrated, and / or FIG. 16 the transceiver 1665 and the antenna 1670 of the communication device 1600 in the apparatus 1000. Means for receiving or obtaining can comprise FIG. 3 the transceiver 354 and / or the antenna 352 of the UE 104 as illustrated, FIG. 3 the transceiver 332 and / or the antenna 334 of the BS 102 as illustrated, and / or FIG. 16 the transceiver 1665 and the antenna 1670 of the communication device 1600 in the apparatus 1000.

[0251] Example clauses

[0252] Implementation examples are described in the following numbered clauses:

[0253] Clause 1 : A method for wireless communications at a user equipment (UE), comprising: receiving first signaling that configures the UE with a first set of reference signal (RS) resources for periodically transmitting RSs and at least a second set of periodic RS resources for opportunistically transmitting RSs; receiving second signaling that indicates when RSs are to be transmitted in transmission occasions of the second set of RS resources; computing a time correlation metric based on measurements of RSs transmitted in the transmission occasions of the second set of RS resources according to the second signaling and measurements of RSs transmitted in transmission occasions of the first set of RS resources; and transmitting a report that indicates the time correlation metric.

[0254] Clause 2: The method of Clause 1, wherein the time correlation metric is a lag for a time interval between the transmission occasions of the first set of RS resources and the transmission occasions of the second set of RS resources.

[0255] Clause 3: The method of Clause 2, wherein: the at least a second set of periodic RS resources comprises a plurality of sets of periodic RS resources; and a value of the lag determines the transmission occasions of one of the plurality of sets of periodic RS resources.

[0256] Clause 4: The method of Clause 3, wherein: the first set of RS resources is configured with a first periodicity; and each of the plurality of sets of periodic RS resources is configured with a periodicity that is an integer multiple of the first periodicity.

[0257] Clause 5: The method of Clause 4, further comprising determining the transmission occasions of the second set of RS resources for computing the time correlation metric based on the value of the lag, a first offset associated with the first set of RS resources, a second offset associated with the second set of periodic RS resources, and the first periodicity.

[0258] Clause 6: The method of any of Clauses 1-5, wherein the second signaling comprises a first physical downlink control channel (PDCCH) that triggers reporting time correlation.

[0259] Clause 7: The method of Clause 6, wherein the UE is configured to compute the time correlation metric only when the PDCCH satisfies a timing requirement that is based on an offset between the PDCCH and the transmission occasions of the first set of RS resources.

[0260] Clause 8: The method of clause 7, wherein the timing requirement specifies that the offset is at least one of: not less than a first threshold; and not greater than a second threshold, wherein the second threshold is greater than the first threshold.

[0261] Clause 9: The method of clause 6, further comprising: receiving a second PDCCH that triggers sending the report.

[0262] Clause 10: The method of clause 9, wherein the first PDCCH and the second PDCCH indicate a same aperiodic reporting trigger state.

[0263] Clause 11: The method of clause 9, wherein an offset between the first PDCCH and the second PDCCH is less than or equal to a threshold.

[0264] Clause 12: The method of any of clauses 1-11, wherein: RS is not transmitted in transmission occasions of the second set of RS resources during an inactive network discontinuous transmission (DTX) duration; and the second signaling indicates an active network DTX duration.

[0265] Clause 13: The method of clause 12, wherein RS is not transmitted in transmission occasions of the first set of RS resources during an inactive network DTX duration.

[0266] Clause 14: The method of any of clauses 1-13, wherein: RS is not transmitted in transmission occasions of the second set of RS resources during an inactive network discontinuous transmission (DTX) duration; and the second signaling comprises a physical downlink control channel (PDCCH) indicating that RS will be transmitted in transmission occasions of the second set of RS resources during an active network DTX duration.

[0267] Clause 15: A method for wireless communication at a network entity, comprising: transmitting first signaling that configures a user equipment (UE) with a first set of reference signal (RS) resources for periodically transmitting RS and at least a second set of periodic RS resources for opportunistically transmitting RS; transmitting second signaling that indicates when RS will be transmitted in transmission occasions of the second set of RS resources; and receiving a report that indicates a time correlation metric that is computed by the UE based on measurements of RS transmitted in the transmission occasions of the second set of RS resources according to the second signaling and measurements of RS transmitted in transmission occasions of the first set of RS resources.

[0268] Clause 16: The method of clause 15, wherein the time correlation metric is a hysteresis for a time interval between the transmission occasion of the first set of RS resources and the transmission occasion of the second set of RS resources.

[0269] Clause 17: The method of clause 16, wherein: the at least second set of periodic RS resources comprises a plurality of sets of periodic RS resources; and the value of the hysteresis determines the transmission occasion of one set of the plurality of sets of periodic RS resources.

[0270] Clause 18: The method of clause 17, wherein: the first set of RS resources is configured with a first periodicity; and each set of the plurality of sets of periodic RS resources is configured with a periodicity that is an integer multiple of the first periodicity.

[0271] Clause 19: The method of clause 18, further comprising determining the transmission occasion of the second set of RS resources for computing the time correlation metric based on: the value of the hysteresis, a first offset associated with the first set of RS resources, a second offset associated with the second set of periodic RS resources, and the first periodicity.

[0272] Clause 20: The method of any of clauses 15 to 19, wherein the second signaling comprises a first physical downlink control channel (PDCCH) that triggers reporting time correlation.

[0273] Clause 21: The method of clause 20, wherein the UE is configured to compute the time correlation metric only when the PDCCH satisfies a timing requirement based on an offset between the PDCCH and the transmission occasion of the first set of RS resources.

[0274] Clause 22: The method of clause 21, wherein the timing requirement provides that the offset is at least one of: not less than a first threshold; and not greater than a second threshold, wherein the second threshold is greater than the first threshold.

[0275] Clause 23: The method of clause 20, further comprising transmitting a second PDCCH that triggers transmission of the report.

[0276] Clause 24: The method of clause 23, wherein the first PDCCH and the second PDCCH indicate a same aperiodic reporting trigger state.

[0277] Clause 25: The method of clause 23, wherein an offset between the first PDCCH and the second PDCCH is less than or equal to a threshold.

[0278] Clause 26: The method of any of clauses 15 to 25, wherein: the RS is not transmitted in transmission occasions of the second set of RS resources during an inactive network discontinuous transmission (DTX) duration; and the second signaling indicates an active network DTX duration.

[0279] Clause 27: The method of clause 26, wherein the RS is not transmitted in transmission occasions of the first set of RS resources during an inactive network DTX duration.

[0280] Clause 28: The method of any of clauses 15 to 27, wherein: the RS is not transmitted in transmission occasions of the second set of RS resources during an inactive network discontinuous transmission (DTX) duration; and the second signaling comprises a physical downlink control channel (PDCCH) indicating that the RS will be transmitted in transmission occasions of the second set of RS resources during an active network DTX duration.

[0281] Clause 29: An apparatus comprising: a memory including executable instructions; and a processor configured to execute the executable instructions and cause the apparatus to perform the method of any of clauses 1 to 28.

[0282] Clause 30: An apparatus comprising means for performing the method of any of clauses 1 to 28.

[0283] Clause 31: A non-transitory computer-readable medium comprising executable instructions that, when executed by a processor of an apparatus, cause the apparatus to perform the method of any of clauses 1 to 28.

[0284] Clause 32: A computer program product embodied on a computer-readable storage medium, the computer-readable storage medium comprising code for performing the method of any of clauses 1 to 28.

[0285] Additional notes

[0286] The preceding description is provided to enable any person skilled in the art to practice the various aspects described herein. The examples discussed herein are not limiting in terms of the scope, application, or aspects of the claims. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other aspects. For example, the functionality of the described elements can be combined in a single element or divided into multiple elements. The various examples can omit, substitute, or add various procedures or components as appropriate. The described ordering of the steps is not essential for the various aspects described herein, as some of the procedures can take place in different orders or concurrently with one another. Furthermore, various aspects described in relation to some examples can be combined in some other examples. For example, the use of any of the aspects described herein can be used in combination with one another. In addition, the scope of the disclosure is intended to include use of other structures, functionality, or structures and functionality in addition to or in place of the various aspects described herein. It will be appreciated that any aspect of the disclosure disclosed herein can be implemented by one or more elements of a claim.

[0287] The various illustrative logical blocks, modules, and circuits described in connection with the disclosure herein can be implemented or performed with a general-purpose processor, a Digital Signal Processor (DSP), an ASIC, a Field-Programmable Gate Array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. Although a general-purpose processor can be a microprocessor, in the alternative, the processor can be any commercially available processor, controller, microcontroller, or state machine. A processor can also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, a

[0288] As used herein, “processor,” “at least one processor,” or “one or more processors” generally refer to a single processor configured to perform one or more operations or multiple processors configured to collectively perform one or more operations. In the case of multiple processors, the performance of the one or more operations can be divided among the different processors, but one processor can perform multiple operations and multiple processors can collectively perform a single operation. Similarly, “memory,” “at least one memory,” or “one or more memories” generally refer to a single memory configured to store data and / or instructions, multiple memories configured to collectively store data and / or instructions.

[0289] As used herein, the phrase referring to "at least one of a list of items means any combination of those items, including single members. For example, "at least one of a, b, or c" is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination of multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c, or any other ordering of a, b, and c).

[0290] As used herein, the term "determining" encompasses a wide variety of actions. For example, "determining" can include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database or another data structure), ascertaining and the like. Additionally, "determining" can include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory) and the like. Furthermore, "determining" can include resolving, selecting, choosing, establishing and the like.

[0291] The methods disclosed herein comprise one or more actions for implementing the methods. The actions of the methods can be interchanged with one another without departing from the scope of the claims. In other words, the order of the specific actions can be modified and / or used without departing from the scope of the claims unless a specific order of actions is specified. Furthermore, various operations of the methods described above can be performed by any suitable means including, but not limited to, hardware, firmware, software, or any combination of means. Means can include various hardware and / or software components and / or modules that are capable of performing the corresponding functions.

[0292] The following claims are not intended to be limited to the aspects shown herein, but are to be accorded the full scope consistent with the language of the claims. Within the claims, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term "some" means one or more unless the context clearly indicates otherwise. The term "comprising" (and grammatical variations thereof) is used herein to mean that the methods and compositions include the recited elements, but not excluding others. The term "consisting essentially of" is used herein to mean the methods and compositions include the recited elements, plus other elements that do not materially affect the basic and novel characteristics of the compositions or methods. The use of the term "comprising" (and grammatical variations thereof) does not preclude the addition of more elements or steps, while the use of the term "consisting essentially of" (and grammatical variations thereof) precludes the addition of more elements or steps that materially affect the basic and novel characteristics of the compositions or methods. Any incorporation by reference of provisional or foreign priority applications are hereby expressly incorporated by reference in their entirety. Furthermore, to the extent not already in the prior art, any incorporation by reference of U.S. patents, U.S. patent applications, and / or published U.S. patent applications is expressly intended to be incorporated by reference in their entirety. Nothing herein is to be construed as an admission that the application is not entitled to antecedent art. All references recited herein are expressly incorporated by reference, including U.S. provisional patent application 61 / 1 12, 1 1 1, filed November 6, 2008, and U.S. provisional patent application 61 / 1 12, 1 12, filed November 6, 2008. Any incorporation by reference of provisional or foreign priority applications is hereby expressly incorporated by reference in their entirety. Furthermore, to the extent not already in the prior art, any incorporation by reference of U.S. patents, U.S. patent applications, and / or published U.S. patent applications is expressly intended to be incorporated by reference in their entirety. Nothing herein is to be construed as an admission that the application is not entitled to antecedent art.

Claims

1. An apparatus for wireless communication at a user equipment (UE), the apparatus comprising: a memory, the memory comprising computer-executable instructions; and one or more processors configured to execute the computer-executable instructions and cause the apparatus to: receive first signaling that configures the UE with a first set of RS resources for periodically transmitting a reference signal (RS) and at least a second set of periodic RS resources for opportunistically transmitting a RS; receive second signaling that indicates when a RS is to be transmitted in a transmission occasion of the second set of RS resources; compute a time correlation metric based on measurements of RSs transmitted in the transmission occasions of the second set of RS resources according to the second signaling and measurements of RSs transmitted in transmission occasions of the first set of RS resources; and transmit a report that indicates the time correlation metric.

2. The apparatus of claim 1, wherein the time correlation metric is a lag for a time interval between the transmission occasions of the first set of RS resources and the transmission occasions of the second set of RS resources.

3. The apparatus of claim 2, wherein: the at least a second set of periodic RS resources comprises a plurality of sets of periodic RS resources; and a value of the lag determines the transmission occasion of one of the plurality of sets of periodic RS resources.

4. The apparatus of claim 3, wherein: the first set of RS resources is configured with a first periodicity; and each of the plurality of sets of periodic RS resources is configured with a periodicity that is an integer multiple of the first periodicity.

5. The apparatus of claim 4, wherein the one or more processors are further configured to execute the computer-executable instructions and cause the apparatus to: determine the transmission occasion of the second set of RS resources for computing the time correlation metric based at least in part on the value of the lag, a first offset associated with the first set of RS resources, a second offset associated with the second set of periodic RS resources, and the first periodicity.

6. The apparatus of claim 1, wherein the second signaling comprises a first physical downlink control channel (PDCCH) that triggers reporting time correlation.

7. The apparatus of claim 6, wherein the UE is configured to compute the time correlation metric only when the PDCCH satisfies a timing requirement based on at least one of a first offset between the PDCCH and the transmission occasion of the first set of RS resources or a second offset between the PDCCH and the transmission occasion of the second set of RS resources.

8. The apparatus of claim 7, wherein the transmission occasion of the second set of RS resources is associated with a maximum value of a lag.

9. The apparatus of claim 7, wherein the timing requirement provides that the first offset is at least one of: not less than a first threshold; and not greater than a second threshold, wherein the second threshold is greater than the first threshold.

10. The apparatus of claim 6, wherein the one or more processors are further configured to execute the computer-executable instructions and cause the apparatus to: receive a second PDCCH triggering transmission of the report.

11. The apparatus of claim 10, wherein the first PDCCH and the second PDCCH indicate a same aperiodic reporting trigger state.

12. The apparatus of claim 10, wherein an offset between the first PDCCH and the second PDCCH is less than or equal to a threshold value.

13. The apparatus of claim 1, wherein: RS is not transmitted in transmission occasions of the second set of RS resources during an inactive network discontinuous transmission (DTX) duration; the second signaling indicates an active network DTX duration; and RS is not transmitted in transmission occasions of the first set of RS resources during the inactive network DTX duration.

14. The apparatus of claim 1, wherein: RS is not transmitted in transmission occasions of the second set of RS resources during an inactive network discontinuous transmission (DTX) duration; and the second signaling comprises a physical downlink control channel (PDCCH) indicating that RS will be transmitted in transmission occasions of the second set of RS resources during an active network DTX duration. a memory, the memory comprising computer-executable instructions; 15. An apparatus for wireless communication at a network entity, the apparatus comprising: and one or more processors configured to execute the computer-executable instructions and cause the apparatus to: transmit first signaling configuring a user equipment (UE) with a first set of reference signal (RS) resources for periodic transmission of RS and at least a second set of periodic RS resources for opportunistic transmission of RS; transmit second signaling indicating when RS will be transmitted in transmission occasions of the second set of RS resources; and receive a report indicating a time correlation metric calculated by the UE based on measurements of RS transmitted in the transmission occasions of the second set of RS resources according to the second signaling and measurements of RS transmitted in transmission occasions of the first set of RS resources.

16. The apparatus of claim 15, wherein the time correlation metric is a lag for a time interval between the transmission occasions of the first set of RS resources and the transmission occasions of the second set of RS resources. the at least a second set of periodic RS resources comprises a plurality of sets of periodic RS resources; and a value of the lag determines the transmission occasions of one of the plurality of sets of periodic RS resources.

17. The apparatus of claim 16, wherein: the first set of RS resources is configured with a first periodicity; and each of the plurality of sets of periodic RS resources is configured with a periodicity that is an integer multiple of the first periodicity.

18. The apparatus of claim 17, wherein: ​ 19. The apparatus of claim 18, wherein the one or more processors are further configured to execute the computer-executable instructions and cause the apparatus to: determine the transmission occasion of the second set of RS resources for computing the time correlation metric based at least in part on: the value of the lag, a first offset associated with the first set of RS resources, a second offset associated with the second set of periodic RS resources, and the first periodicity.

20. The apparatus of claim 15, wherein the second signaling comprises a first physical downlink control channel (PDCCH) triggering reporting time correlation.

21. The apparatus of claim 20, wherein the UE is configured to compute the time correlation metric only when the PDCCH satisfies a timing requirement based on at least one of a first offset between the PDCCH and the transmission occasion of the first set of RS resources or a second offset between the PDCCH and the transmission occasion of the second set of RS resources.

22. The apparatus of claim 21, wherein the transmission occasion of the second set of RS resources is associated with a maximum value of a lag.

23. The apparatus of claim 21, wherein the timing requirement provides that the first offset is at least one of: not less than a first threshold; and not greater than a second threshold, wherein the second threshold is greater than the first threshold.

24. The apparatus of claim 20, wherein the one or more processors are further configured to execute the computer-executable instructions and cause the apparatus to: transmit a second PDCCH triggering transmission of the report.

25. The apparatus of claim 24, wherein the first PDCCH and the second PDCCH indicate a same aperiodic reporting trigger state.

26. The apparatus of claim 24, wherein an offset between the first PDCCH and the second PDCCH is less than or equal to a threshold.

27. The apparatus of claim 15, wherein: RS is not transmitted in transmission occasions of the second set of RS resources during an inactive network discontinuous transmission (DTX) duration; the second signaling indicates an active network DTX duration; and RS is not transmitted in transmission occasions of the first set of RS resources during the inactive network DTX duration.

28. The apparatus of claim 15, wherein: RS is not transmitted in transmission occasions of the second set of RS resources during an inactive network discontinuous transmission (DTX) duration; and the second signaling comprises a physical downlink control channel (PDCCH) indicating that RS will be transmitted in transmission occasions of the second set of RS resources during an active network DTX duration.

29. A method for wireless communication at a user equipment (UE), comprising: receiving first signaling that configures the UE with a first set of reference signal (RS) resources for periodically transmitting RS and at least a second set of periodic RS resources for opportunistically transmitting RS; receiving second signaling that indicates when RS will be transmitted in transmission occasions of the second set of RS resources; computing a time correlation metric based on measurements of RS transmitted in the transmission occasions of the second set of RS resources according to the second signaling and measurements of RS transmitted in transmission occasions of the first set of RS resources; and transmitting a report that indicates the time correlation metric.

30. A method for wireless communication at a network entity, the method comprising: transmitting first signaling that configures a user equipment (UE) with a first set of reference signal (RS) resources for periodically transmitting RS and at least a second set of periodic RS resources for opportunistically transmitting RS; transmitting second signaling that indicates when RS will be transmitted in transmission occasions of the second set of RS resources; and receiving a report that indicates a time correlation metric computed by the UE based on measurements of RS transmitted in the transmission occasions of the second set of RS resources according to the second signaling and measurements of RS transmitted in transmission occasions of the first set of RS resources.

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