Reference signal resource configuration

Abstract

Aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may transmit using a random access channel and when operating in an idle mode or an inactive mode, send a request for information identifying a reference signal configuration; and in response to the request and based at least in part on a mode of the UE, selectively receive information identifying a reference signal configuration for reception of a reference signal, wherein the reference signal is a channel state information reference signal or a tracking reference signal. Many other aspects are also provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to U.S. Provisional Patent Application No. 62 / 959,674, filed on January 10, 2020, entitled “REFERENCE SIGNAL RESOURCE CONFIGURATION,” and U.S. Non-Provisional Patent Application No. 17 / 248,077, filed on January 7, 2021, entitled “REFERENCE SIGNAL RESOURCE CONFIGURATION,” which are expressly incorporated herein by reference. Technical Field

[0003] Aspects of the present disclosure relate generally to wireless communications and techniques and apparatus for reference signal resource configuration. Background Art

[0004] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). 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 long term evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).

[0005] A wireless communication network may include several base stations (BS) that may support communications for several user equipments (UEs). User equipments (UEs) may communicate with base stations (BSs) via downlinks and uplinks. Downlinks (or forward links) refer to the communication link from a BS to a UE, while uplinks (or reverse links) refer to the communication link from a UE to a BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, access point (AP), radio head, transmit receive point (TRP), new radio (NR) BS, 5G Node B, etc.

[0006] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user devices to communicate at municipal, national, regional, and even global levels. New Radio (NR, also known as 5G) is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR aims to support mobile broadband Internet access by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with cyclic prefix (CP) on the downlink (DL) and CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL) to better integrate with other open standards, as well as supporting beamforming, multiple input multiple output (MIMO) antenna technology, and carrier aggregation. However, as the demand for mobile broadband access continues to increase, further improvements in LTE and NR technologies are needed. Summary of the invention

[0007] In some aspects, a method of wireless communication performed by a user equipment (UE) may include: sending a request for information identifying a reference signal configuration using a random access channel transmission and when operating in an idle mode or an inactive mode; and selectively receiving information identifying a reference signal configuration for reception of a reference signal in response to the request and based at least in part on a mode of the UE, wherein the reference signal is a channel state information reference signal or a tracking reference signal.

[0008] In some aspects, a method of wireless communication performed by a UE may include: when operating in a connected mode, sending a request for information identifying a reference signal configuration; and in response to the request, selectively receiving information identifying a reference signal configuration for reception of a reference signal, wherein the reference signal is a channel state information reference signal or a tracking reference signal.

[0009] In some aspects, a method of wireless communication performed by a base station (BS) may include receiving a request for information identifying a reference signal configuration from a UE; and in response to the request, selectively sending to the UE information identifying a reference signal configuration for reception of a reference signal, wherein the reference signal is a channel state information reference signal or a tracking reference signal.

[0010] In some aspects, a UE for wireless communication may include a memory and one or more processors operably coupled to the memory. The memory and the one or more processors may be configured to transmit a request for information identifying a reference signal configuration using a random access channel transmission and when operating in an idle mode or an inactive mode; and selectively receive information identifying a reference signal configuration for reception of a reference signal in response to the request and based at least in part on a mode of the UE, wherein the reference signal is a channel state information reference signal or a tracking reference signal.

[0011] In some aspects, a UE for wireless communication may include a memory and one or more processors operably coupled to the memory. The memory and the one or more processors may be configured to, when operating in a connected mode, send a request for information identifying a reference signal configuration; and selectively receive, in response to the request, information identifying a reference signal configuration for reception of a reference signal, wherein the reference signal is a channel state information reference signal or a tracking reference signal.

[0012] In some aspects, a BS for wireless communication may include a memory and one or more processors operably coupled to the memory. The memory and the one or more processors may be configured to receive a request for information identifying a reference signal configuration from a UE; and in response to the request, selectively send information identifying a reference signal configuration for reception of a reference signal to the UE, wherein the reference signal is a channel state information reference signal or a tracking reference signal.

[0013] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a UE, may cause the one or more processors to: transmit a request for information identifying a reference signal configuration using a random access channel transmission and when operating in an idle mode or an inactive mode; and selectively receive information identifying a reference signal configuration for reception of a reference signal in response to the request and based at least in part on a mode of the UE, wherein the reference signal is a channel state information reference signal or a tracking reference signal.

[0014] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a UE, may cause the one or more processors to: when operating in a connected mode, send a request for information identifying a reference signal configuration; and in response to the request, selectively receive information identifying a reference signal configuration for reception of a reference signal, wherein the reference signal is a channel state information reference signal or a tracking reference signal.

[0015] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a BS, may cause the one or more processors to: receive a request for information identifying a reference signal configuration from a UE; and selectively send information identifying a reference signal configuration for reception of a reference signal to the UE in response to the request, wherein the reference signal is a channel state information reference signal or a tracking reference signal.

[0016] In some aspects, an apparatus for wireless communication may include components for sending a request for information identifying a reference signal configuration using random access channel transmission and when operating in an idle mode or an inactive mode; and components for selectively receiving information identifying a reference signal configuration for reception of a reference signal as a response to the request and based at least in part on a mode of the apparatus, wherein the reference signal is a channel state information reference signal or a tracking reference signal.

[0017] In some aspects, an apparatus for wireless communication may include components for sending a request for information identifying a reference signal configuration when operating in a connected mode; and components for selectively receiving information identifying a reference signal configuration for reception of a reference signal in response to the request, wherein the reference signal is a channel state information reference signal or a tracking reference signal.

[0018] In some aspects, an apparatus for wireless communication may include components for receiving a request for information identifying a reference signal configuration from a UE; and components for selectively sending information identifying a reference signal configuration for reception of a reference signal to the UE in response to the request, wherein the reference signal is a channel state information reference signal or a tracking reference signal.

[0019] Aspects generally include methods, apparatuses, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and processing systems as generally described herein with reference to and as illustrated in the drawings and description.

[0020] The features and technical advantages of the examples according to the present disclosure have been outlined quite broadly above so that the following detailed description may be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples may be easily used as a basis for modifying or designing other structures for achieving the same purpose of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The features of the concepts disclosed herein in terms of their organization and method of operation and the associated advantages will be better understood through the following description in conjunction with the accompanying drawings. Each of the drawings is provided for the purpose of illustration and description and not as a definition of limitations of the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order that the above-mentioned features of the present disclosure may be understood in detail, a more specific description of the content briefly summarized above may be made with reference to various aspects, some of which are shown in the accompanying drawings. However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and should not be considered as limiting the scope thereof, as the description may allow for other equivalent aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0022] Figure 1 is a diagram illustrating an example of a wireless communication network according to aspects of the present disclosure.

[0023] Figure 2 is a diagram illustrating an example of a base station communicating with a UE in a wireless communication network according to aspects of the present disclosure.

[0024] Figure 3 is a diagram illustrating an example of reference signal resource configuration according to aspects of the present disclosure.

[0025] Figure 4 is a diagram illustrating an example process performed, for example, by a user device according to aspects of the present disclosure.

[0026] Figure 5 is a diagram illustrating an example process performed, for example, by a user device according to aspects of the present disclosure.

[0027] Figure 6 is a diagram illustrating an exemplary process, for example, performed by a base station, according to aspects of the present disclosure.

[0028] Figure 7 and Figure 8 is a diagram illustrating an exemplary apparatus according to aspects of the present disclosure. DETAILED DESCRIPTION

[0029] The various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be implemented in many different forms, and should not be interpreted as being limited to any specific structure or function given throughout the present disclosure. On the contrary, these aspects are provided to make the present disclosure thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings herein, it should be understood by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is implemented independently of any other aspect of the present disclosure or implemented in combination with any other aspect of the present disclosure. For example, any number of aspects set forth herein can be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such devices or methods practiced using supplements or other other structures, functionality or structures and functionality of the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein can be implemented by one or more elements of the claims.

[0030] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0031] Note that while various aspects may be described herein using terminology typically associated with 3G and / or 4G wireless technologies, various aspects of the present disclosure may be applied in communication systems based on other generations, such as 5G and later generations, including NR technologies.

[0032] Figure 1 1 is a diagram illustrating a wireless network 100 in which various aspects of the present disclosure may be practiced. The wireless network 100 may be an LTE network or some other wireless network, such as a 5G or NR network. The wireless network 100 may include several BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A BS is an entity that communicates with a user equipment (UE) and may also be referred to as a base station, NR BS, Node B, gNB, 5G Node B (NB), access point, transmit receive point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to a coverage area of ​​a BS and / or a BS subsystem serving a coverage area, depending on the context in which the term is used.

[0033] A BS may provide communication coverage for macro cells, pico cells, femto cells, and / or other types of cells. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access to UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access to UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access to UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1 In the example shown in , BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102c. A BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "Node B", "5G NB", and "cell" may be used interchangeably herein.

[0034] In some aspects, the cells may not necessarily be stationary, and the geographic area of ​​the cells may move depending on the location of the mobile BS. In some aspects, the BSs may be interconnected to each other and / or to one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces (such as direct physical connections, virtual networks using any suitable transmission network, etc.).

[0035] The wireless network 100 may also include a relay station. A relay station is an entity that can receive data transmissions from an upstream station (e.g., a BS or a UE) and send data transmissions to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown in FIG. 1 , a relay station 110 d may communicate with a macro BS 110 a and a UE 120 d to facilitate communication between the BS 110 a and the UE 120 d. A relay station may also be referred to as a relay BS, a relay base station, a relay, or the like.

[0036] The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmit power level (e.g., 0.1 to 2 watts).

[0037] A network controller 130 may be coupled to a set of BSs and may provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. These BSs may also communicate with each other directly or indirectly, for example, via a wireless or wired backhaul.

[0038] UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile. UEs may also be referred to as access terminals, terminals, mobile stations, subscriber units, stations, etc. UEs may be cellular phones (e.g., smart phones), personal digital assistants (PDAs), wireless modems, wireless communication devices, handheld devices, laptop computers, cordless phones, wireless local loop (WLL) stations, tablet computers, cameras, gaming devices, netbooks, smartbooks, ultrabooks, medical devices or equipment, biometric sensors / devices, wearable devices (smart watches, smart clothing, smart glasses, smart wristbands, smart jewelry (e.g., smart rings, smart bracelets)), entertainment devices (e.g., music or video devices, or satellite radios), vehicle-mounted components or sensors, smart meters / sensors, industrial manufacturing equipment, global positioning system devices, or any other suitable device configured to communicate via wireless or wired media.

[0039] Some UEs may be considered as machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which may communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may, for example, provide connectivity to a network (e.g., a wide area network such as the Internet or a cellular network) or to a network via a wired or wireless communication link. Some UEs may be considered as Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered as user premises equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120, such as a processor component, a memory component, etc.

[0040] Generally, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific RAT and can operate on one or more frequencies. RAT can also be referred to as radio technology, air interface, etc. Frequency can also be referred to as carrier, frequency channel, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0041] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly (e.g., without using base station 110 as an intermediary to communicate with each other) using one or more side link channels. For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.), mesh networks, etc. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0042] As mentioned above, Figure 1 This is provided as an example only. Other examples may differ from combining Figure 1 The content described.

[0043] Figure 2 is a diagram of a design 200 of base station 110 and UE 120, which may be Figure 1 Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general, T≥1 and R≥1.

[0044] At the base station 110, the transmit processor 220 may receive data for one or more UEs from the data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on a channel quality indicator (CQI) received from each UE, process (e.g., encode and modulate) the data for each UE based at least in part on the (multiple) MCS selected for the UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI) and the like) and control information (e.g., CQI requests, grants, upper layer signaling notifications, etc.), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signals (PSS) and secondary synchronization signals (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols where applicable, and may provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 may process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t may be transmitted via T antennas 234a to 234t, respectively. According to various aspects described in more detail below, position coding may be used to generate synchronization signals to convey additional information.

[0045] At UE 120, antennas 252a to 252r may receive downlink signals from base station 110 and / or other base stations, and may provide received signals to demodulators (DEMODs) 254a to 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols where applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller / processor 280. The channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of the UE 120 may be included in the housing 284.

[0046] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266, if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. At the base station 110, uplink signals from the UE 120 and other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236, if applicable, and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 120. The receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0047] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any (multiple) other components of may perform one or more techniques associated with reference signal resource configuration, as described in more detail elsewhere herein. For example, controller / processor 240 of base station 110, controller / processor 280 of UE 120, and / or Figure 2 Any other component(s) may perform or direct e.g. Figure 4 The process of 400 Figure 5 The process of 500 Figure 6 The operations of process 600 and / or other processes described herein may be performed. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, when executed by one or more processors of base station 110 and / or UE 120, the one or more instructions may perform or direct, for example, Figure 4 The process of 400 Figure 5 The process of 500 Figure 6 The operations of process 600 and / or other processes as described herein. The scheduler 246 can schedule UEs to transmit data on the downlink and / or uplink.

[0048] In some aspects, UE 120 may include: a component for transmitting using a random access channel and when operating in an idle mode or an inactive mode, sending a request for information identifying a reference signal configuration; and a component for selectively receiving, in response to the request and based at least in part on a mode of the UE, information identifying a reference signal configuration for reception of a reference signal, wherein the reference signal is a channel state information reference signal or a tracking reference signal, etc. In some aspects, UE 120 may include a component for transmitting when operating in a connected mode, sending a request for information identifying a reference signal configuration; and a component for selectively receiving, in response to the request, information identifying a reference signal configuration for reception of a reference signal, wherein the reference signal is a channel state information reference signal or a tracking reference signal, etc. In some aspects, such a component may include a component for transmitting when operating in a connected mode, sending a request for information identifying a reference signal configuration; and a component for selectively receiving, in response to the request, information identifying a reference signal configuration for reception of a reference signal, wherein the reference signal is a channel state information reference signal or a tracking reference signal, etc. Figure 2 One or more components of UE 120 are depicted, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, etc.

[0049] In some aspects, base station 110 may include means for receiving a request from a UE for information identifying a reference signal configuration; and means for selectively sending to the UE, in response to the request, information identifying a reference signal configuration for reception of a reference signal, wherein the reference signal is a channel state information reference signal or a tracking reference signal, etc. In some aspects, such means may include combining Figure 2 One or more components of base station 110 are depicted, such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and the like.

[0050] As mentioned above, Figure 2 This is provided as an example only. Other examples may differ from combining Figure 2 The content described.

[0051] In some communication systems, the UE can be switched from a connected mode to an idle mode or an inactive mode, in which the UE uses a regular power level and in which the UE uses a reduced power level. This can increase the battery life of the UE. In idle mode or inactive mode, the UE can deactivate one or more functions to reduce power consumption (such as by monitoring to receive signaling notifications only during a subset of symbols or time slots). The BS and the UE can coordinate to ensure that the BS sends information during a subset of symbols or time slots during which the UE is configured to receive information. For example, the UE can periodically monitor a paging channel to attempt to receive a paging message from the BS, and when the UE is scheduled to monitor the paging channel, the BS can send a paging message during a paging occasion.

[0052] In some cases, the BS may send a physical downlink control channel (PDCCH) with downlink control information (DCI) to indicate the corresponding physical downlink shared channel (PDSCH) on which the paging message is to be transmitted. In order to facilitate the reception of the paging message, the BS may send reference signals and information for channel tracking, cell search, cell reselection, etc. In LTE, the cell-specific reference signal (CRS) can be used by UEs in idle mode. However, in NR, only synchronization signal (SS) or physical broadcast channel (PBCH) blocks are available for UEs in idle mode or inactive mode. In some cases, the synchronization signal block (SSB) density (e.g., the frequency at which the BS sends SSBs) may be less than a threshold, which may cause the paging opportunity to be relatively far from the nearest SSB. Therefore, the length of time that the UE remains turned on between the nearest SSB and the relevant paging opportunity may be relatively long, which may lead to excessive use of power resources.

[0053] To reduce this delay between receiving an SSB and the corresponding paging occasion, the BS may use additional reference signals, such as a Tracking Reference Signal (TRS) or Channel State Information Reference Signal (CSI-RS) resource, which is allocated to a connected mode UE to provide signaling notifications for an idle mode or inactive mode UE. However, in some cases, sharing of TRS or CSI-RS resources may still result in a UE remaining turned on for an excessively long time. For example, when a cell is lightly loaded (e.g., the amount of traffic transmitted on the cell for a connected mode UE is less than a threshold amount), the network may lack allocated TRS or CSI-RS resources to share with an idle mode or inactive mode UE.

[0054] Some aspects described herein enable a UE to request reference signal resources so that the UE can communicate (e.g., receive paging) in idle mode or inactive mode. For example, when the UE is in idle mode or inactive mode, the UE can use the allocated random access channel (RACH) resources to send RACH transmissions to request reference signal resources. Additionally or alternatively, when the UE is in connected mode, the UE can send a radio resource control (RRC) message, a media access control (MAC) control element (CE), uplink control information (UCI), etc. to request reference signal resources for subsequent use in idle mode or inactive mode. In this case, based at least in part on receiving the request, the BS can provide an indication of the TRS or CSI-RS resources that the UE can use in idle mode or inactive mode. In some aspects, the BS can allocate new TRS or CSI-RS resources for use by the UE when it is in idle mode or inactive mode. Additionally or alternatively, the BS can determine that sufficient resources are not available and can reject the UE request. In this way, the BS and the UE communicate to enable communication in idle mode or inactive mode. Furthermore, by enabling the BS to dynamically allocate or assign TRS or CSI-RS resources to a UE, the BS is able to page without the delays associated with using infrequent SSB blocks to provide information to receive a page.

[0055] Figure 3 is a diagram illustrating an example 300 of reference signal resource configuration in accordance with aspects of the present disclosure.

[0056] like Figure 3As shown, and by reference numeral 310, UE 120 may request reference signal resources. For example, UE 120 may request CSI-RS resources, TRS resources, etc. to achieve channel estimation, cell selection, etc., for receiving subsequent paging in idle mode or inactive mode. In some aspects, UE 120 may request reference signal resources when operating in idle mode or inactive mode. For example, UE 120 may initiate a RACH process by sending a RACH preamble using RACH resources allocated for requesting reference signal resources. In another example, UE 120 may initiate a RACH process using common RACH resources, and may send a request for reference signal resources using a message 3 transmission associated with the RACH process. In these cases, by sending a RACH transmission to request reference signal resources, UE 120 may avoid triggering an RRC recovery process or an RRC connection reestablishment process, thereby avoiding excessive use of power resources.

[0057] In some aspects, at a previous time, BS 110 may provide information identifying time resources, frequency resources, etc. for RACH opportunities in which UE 120 may send RACH transmissions. Additionally or alternatively, BS 110 may provide information identifying a RACH preamble sequence to use for the RACH opportunity. In some aspects, BS 110 may use a master information block (MIB), a system information block (SIB), etc. to provide information identifying a RACH opportunity and RACH resources associated therewith.

[0058] In some aspects, when UE 120 sends a request for reference signal resources using Message 3 transmission during a RACH procedure, the request may be formatted as a higher layer signaling message similar to a System Information Request message used by UE 120 to request on-demand system information from BS 110 .

[0059] In some aspects, the UE 120 may send a request for reference signal resources while operating in a connected mode (e.g., for subsequent use in an idle mode or an inactive mode). For example, the UE 120 may transition to a connected mode and may send the request after transitioning to the connected mode. In this case, the UE 120 may use RRC signaling, MAC CE signaling, UCI signaling, etc. In some aspects, the UE 120 may transition to a connected mode for another function and may send the request in addition to performing the other function. For example, the UE 120 may transition to a connected mode for tracking, a notification area (RNA) update based on a radio access network (RAN), etc., and may utilize resources allocated for the connected mode to request reference signal resources for subsequent use in an idle mode or an inactive mode. In this case, the UE 120 may request the reference signal resources using dedicated signaling, or may use other signaling (e.g., RNA update signaling) to implicitly indicate a request for reference signaling notification resources. Additionally or alternatively, UE 120 may perform a dedicated transition to connected mode to send the request for reference signal resources using dedicated signaling.

[0060] like Figure 3 As shown, and by reference numeral 320, BS 110 may identify an existing reference signal resource or allocate a new reference signal resource for UE 120. For example, BS 110 may receive a RACH transmission from UE 120 (e.g., when UE 120 is in idle mode or inactive mode) or receive another type of transmission from UE 120 (e.g., when UE 120 is in connected mode), and may determine a reference signal resource for use by UE 120. In some aspects, BS 110 may identify an existing CSI-RS resource or TRS resource for use by UE 120 when CSI-RS resources or TRS resources are available. For example, BS 110 may determine that the TRS resource is allocated for use by a connected mode UE, and may indicate to UE 120 that UE 120 may use the TRS resource when in idle mode or inactive mode. Additionally or alternatively, BS 110 may allocate a new CSI-RS resource or TRS resource. Additionally or alternatively, BS 110 may determine that there are no available time slots and / or symbols and may deny the request for reference signal resources. In this case, BS 110 may avoid sending signaling to UE 120 identifying reference signal resources or indicating, for example, a denial of the request.

[0061] like Figure 3As shown, and by reference numeral 330, UE 120 may selectively receive information identifying reference signal resources. For example, UE 120 may receive signaling notifications from BS 110 identifying existing reference signal resources, newly allocated reference signal resources, etc. Additionally or alternatively, UE 120 may not receive the signaling notifications based at least in part on the BS 110 rejecting the request. In some aspects, based at least in part on receiving the signaling notifications identifying the reference signal resources, UE 120 may receive reference signals to allow channel estimation for paging occasions, cell selection, etc.

[0062] As mentioned above, Figure 3 This is provided as an example only. Other examples may be related to Figure 3 Different than described.

[0063] Figure 4 is a diagram illustrating an exemplary process 400, performed, for example, by a UE, in accordance with aspects of the present disclosure. Exemplary process 400 is an example in which a UE (eg, UE 120, etc.) performs operations associated with reference signal resource configuration.

[0064] like Figure 4 As shown, in some aspects, process 400 may include transmitting a request for information identifying a reference signal configuration using a random access channel transmission and while operating in an idle mode or an inactive mode (block 410). For example, a UE (e.g., using controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, etc.) may transmit a request for information identifying a reference signal configuration using a random access channel transmission and while operating in an idle mode or an inactive mode, as described above.

[0065] like Figure 4 As further shown in FIG. 4 , in some aspects, process 400 may include selectively receiving, in response to the request and based at least in part on a mode of the UE, information identifying a reference signal configuration for receiving a reference signal, wherein the reference signal is a channel state information reference signal or a tracking reference signal (block 420). For example, in response to the request and based at least in part on a mode of the UE, the UE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, etc.) may selectively receive information identifying a reference signal configuration for receiving a reference signal, as described above. In some aspects, the reference signal is a channel state information reference signal or a tracking reference signal.

[0066] Process 400 may include other aspects, such as any single aspect or any combination of aspects described below and / or in combination with one or more other processes described elsewhere herein.

[0067] In a first aspect, sending a random access channel transmission includes transmitting the random access channel transmission using a configured set of random access channel resources.

[0068] In a second aspect, alone or in combination with the first aspect, the configured random access channel resource set is a dedicated random access channel resource set for requesting information identifying a reference signal configuration.

[0069] In the third aspect, either alone or in combination with one or more of the first and second aspects, the configured random access channel resource set includes at least one of a configured time resource for a random access channel opportunity, a configured frequency resource for a random access channel opportunity, or a random access channel preamble code sequence for a random access channel transmission.

[0070] In a fourth aspect, alone or in combination with one or more of the first to third aspects, random access channel transmission does not trigger a radio resource control recovery or connection re-establishment procedure.

[0071] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the random access channel transmission includes a reference signal transmission request.

[0072] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, sending a request for information identifying a reference signal configuration includes sending the request using a message 3 transmission associated with a random access procedure.

[0073] although Figure 4 Example blocks of process 400 are shown, but in some aspects, process 400 may include Figure 4 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in. Additionally or alternatively, two or more blocks of process 400 may be executed in parallel.

[0074] Figure 5 is a diagram illustrating an exemplary process 500, performed, for example, by a UE, in accordance with aspects of the present disclosure. Exemplary process 500 is an example in which a UE (eg, UE 120, etc.) performs operations associated with reference signal resource configuration.

[0075] like Figure 5As shown, in some aspects, process 500 may include sending a request for information identifying a reference signal configuration while operating in a connected mode (block 510). For example, a UE (e.g., using controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, etc.) may send a request for information identifying a reference signal configuration while operating in a connected mode, as described above.

[0076] like Figure 5 As further shown in FIG. 5 , in some aspects, process 500 may include selectively receiving, in response to the request, information identifying a reference signal configuration for receiving a reference signal, wherein the reference signal is a channel state information reference signal or a tracking reference signal (block 520). For example, a UE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, etc.) may selectively receive, in response to the request, information identifying a reference signal configuration for receiving a reference signal, as described above. In some aspects, the reference signal is a channel state information reference signal or a tracking reference signal.

[0077] Process 500 may include other aspects, such as any single aspect or any combination of aspects described below and / or in combination with one or more other processes described elsewhere herein.

[0078] In a first aspect, sending the request includes sending the request using at least one of: a radio resource control message, a medium access control element, an uplink control information message, a tracking area update message, or a radio access network based notification area update message.

[0079] In a second aspect, either alone or in combination with the first aspect, process 500 includes transitioning from an idle mode or an inactive mode to a connected mode to perform a tracking area update or a radio access network-based notification area update, and sending the request includes sending the request based at least in part on the transition from the idle mode or the inactive mode to the connected mode.

[0080] In a third aspect, either alone or in combination with one or more of the first and second aspects, process 500 includes determining a send request, and transitioning from an idle mode or an inactive mode to a connected mode based at least in part on determining the send request, and the send request includes sending the request based at least in part on transitioning from the idle mode or the inactive mode to the connected mode.

[0081] although Figure 5 Example blocks of process 500 are shown, but in some aspects process 500 may include Figure 5Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in. Additionally or alternatively, two or more blocks of process 500 may be performed in parallel.

[0082] Figure 6 is a diagram illustrating an exemplary process 600, performed, for example, by a BS, in accordance with aspects of the present disclosure. Exemplary process 600 is an example in which a BS (eg, BS 110, etc.) performs operations associated with reference signal resource configuration.

[0083] like Figure 6 As shown, in some aspects, process 600 may include receiving a request for information identifying a reference signal configuration from a UE (block 610). For example, a BS (e.g., using transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may receive a request for information identifying a reference signal configuration from a UE, as described above.

[0084] like Figure 6 As further shown in FIG. 6 , in some aspects, process 600 may include selectively sending information identifying a reference signal configuration for receiving a reference signal to the UE in response to the request, wherein the reference signal is a channel state information reference signal or a tracking reference signal (block 620). For example, the BS (e.g., using transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may selectively send information identifying a reference signal configuration for receiving a reference signal to the UE in response to the request, as described above. In some aspects, the reference signal is a channel state information reference signal or a tracking reference signal.

[0085] Process 600 may include other aspects, such as any single aspect or any combination of aspects described below and / or in combination with one or more other processes described elsewhere herein.

[0086] In a first aspect, the UE is in an idle mode or inactive mode and the request is communicated via a random access channel transmission.

[0087] In a second aspect, either alone or in combination with the first aspect, the UE is in connected mode and the request is sent via at least one of a radio resource control message, a media access control element, an uplink control information message, a tracking area update message, or a radio access network-based notification area update message.

[0088] In a third aspect, alone or in combination with one or more of the first and second aspects, processing 600 includes determining a resource set for a reference signal configuration, and selectively sending information identifying the reference signal configuration includes sending information identifying the reference signal configuration based at least in part on determining the resource set for the reference signal configuration.

[0089] In a fourth aspect, either alone or in combination with one or more of the first to third aspects, the resource set is a resource set configured for a connected mode UE, and sending information for identifying a reference signal configuration includes sending an indicator of the resource set configured for a connected mode UE to an idle mode or inactive mode UE.

[0090] In a fifth aspect, either alone or in combination with one or more of aspects 1 to 4, processing 600 includes determining that a configured resource set is unavailable, and sending information identifying a reference signal configuration includes sending an indicator of a new resource set to an idle mode or inactive mode UE based at least in part on determining that the configured resource set is unavailable.

[0091] although Figure 6 Example blocks of process 600 are shown, but in some aspects process 600 may include Figure 6 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in. Additionally or alternatively, two or more blocks of process 600 may be performed in parallel.

[0092] Figure 7 700 is a block diagram of an exemplary apparatus 700 for wireless communication. Apparatus 700 may be a UE, or a UE may include apparatus 700. In some aspects, apparatus 700 includes a receiving component 702 and a sending component 704, which may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, apparatus 700 may communicate with another apparatus 706 (such as a UE, a base station, or another wireless communication device) using receiving component 702 and sending component 704. As further shown, apparatus 700 may include one or more of determining component 708 or converting component 710, as well as other examples.

[0093] In some aspects, the apparatus 700 may be configured to perform the Figure 3 Additionally or alternatively, the apparatus 700 may be configured to perform one or more processes described herein, such as Figure 4 The process of 400 Figure 5 In some aspects, Figure 7 The device 700 and / or one or more components shown may include the above combination Figure 2Additionally or alternatively, Figure 7 One or more of the components shown in the above may be combined Figure 2 Additionally or alternatively, one or more of the set of components may be implemented at least in part as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or codes stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the functions or operations of the component.

[0094] The receiving component 702 may receive communications from the device 706, such as reference signals, control information, data communications, or a combination thereof. The receiving component 702 may provide the received communications to one or more other components of the device 700. In some aspects, the receiving component 702 may perform signal processing (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, etc.) on the received communications and may provide the processed signals to one or more other components of the device 706. In some aspects, the receiving component 702 may include a combination of the above. Figure 2 One or more antennas, demodulators, MIMO detectors, receive processors, controllers / processors, memories, or combinations thereof of a UE are described.

[0095] The transmitting component 704 may transmit communications, such as reference signals, control information, data communications, or combinations thereof, to the device 706. In some aspects, one or more other components of the device 706 may generate communications and may provide the generated communications to the transmitting component 704 for transmission to the device 706. In some aspects, the transmitting component 704 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples) on the generated communications and may transmit the processed signals to the device 706. In some aspects, the transmitting component 704 may include a combination of the above. Figure 2 One or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof of the described UE. In some aspects, the transmit component 704 can be collocated with the receive component 702 in a transceiver.

[0096] The transmitting component 704 may transmit a request for information identifying a reference signal configuration using a random access channel transmission and when operating in an idle mode or an inactive mode. The receiving component 702 may selectively receive information identifying a reference signal configuration for reception of a reference signal in response to the request and based at least in part on a mode of the UE, wherein the reference signal is a channel state information reference signal or a tracking reference signal. The determining component 708 may determine whether to receive the information identifying the reference signal configuration. The determining component 708 may determine to send the request. In some aspects, the determining component 708 may include the above in combination with Figure 2 A receiving processor, a controller / processor, a memory or a combination thereof of a UE is described.

[0097] When operating in connected mode, transmitting component 704 can transmit a request for information identifying a reference signal configuration. Receiving component 702 can selectively receive information identifying a reference signal configuration for reception of a reference signal in response to the request, wherein the reference signal is a channel state information reference signal or a tracking reference signal.

[0098] The transition component 710 can transition from an idle mode or an inactive mode to a connected mode to perform a tracking area update or a radio access network-based notification area update. The transition component 710 can transition from an idle mode or an inactive mode to a connected mode based at least in part on determining that a request is to be sent. In some aspects, the transition component 710 can include the above combined Figure 2 A transmitting processor, a receiving processor, a controller / processor, a memory, or a combination thereof of a UE is described.

[0099] Figure 7 The number and arrangement of components shown in FIG. 1 are provided as an example. In practice, there may be Figure 7 Additional components, fewer components, different components, or differently arranged components than those shown in FIG. Figure 7 Two or more components shown may be implemented in a single component, or Figure 7 The single component shown may be implemented as multiple distributed components. Additionally or alternatively, Figure 7 A set (one or more components) of components shown in the figure may perform the functions described as being Figure 7 Another set of components shown in FIG. 1 performs one or more functions.

[0100] Figure 8800 is a block diagram of an exemplary apparatus 800 for wireless communication. Apparatus 800 may be a BS, or a BS may include apparatus 800. In some aspects, apparatus 800 includes a receiving component 802 and a sending component 804, which may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, apparatus 800 may communicate with another apparatus 806 (such as a UE, a base station, or another wireless communication device) using receiving component 802 and sending component 804. As further shown, apparatus 800 may include a determining component 808, among other examples.

[0101] In some aspects, the apparatus 800 may be configured to perform the Figure 3 Additionally or alternatively, the apparatus 800 may be configured to perform one or more of the processes described herein, such as Figure 6 Process 600. In some aspects, Figure 8 The device 800 and / or one or more components shown may include the above combination Figure 2 Additionally or alternatively, Figure 8 One or more of the components shown in the above may be combined Figure 2 Additionally or alternatively, one or more of the set of components may be implemented at least in part as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or codes stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the functions or operations of the component.

[0102] The receiving component 802 may receive communications from the device 806, such as reference signals, control information, data communications, or a combination thereof. The receiving component 802 may provide the received communications to one or more other components of the device 800. In some aspects, the receiving component 802 may perform signal processing (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, etc.) on the received communications and may provide the processed signals to one or more other components of the device 806. In some aspects, the receiving component 802 may include a combination of the above. Figure 2 One or more antennas, demodulators, MIMO detectors, receive processors, controllers / processors, memories, or combinations thereof of a BS are described.

[0103] Transmitting component 804 may transmit communications, such as reference signals, control information, data communications, or combinations thereof, to device 806. In some aspects, one or more other components of device 806 may generate communications and may provide the generated communications to transmitting component 804 for transmission to device 806. In some aspects, transmitting component 804 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples) on the generated communications and may transmit the processed signals to device 806. In some aspects, transmitting component 804 may include a combination of the above. Figure 2 One or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof of the described BS. In some aspects, the transmit component 804 can be configured with the receive component 802 in a transceiver.

[0104] Receiving component 802 can receive a request for information identifying a reference signal configuration from a UE. In response to the request, transmitting component 804 can selectively transmit to the UE information identifying a reference signal configuration for receiving a reference signal, wherein the reference signal is a channel state information reference signal or a tracking reference signal.

[0105] The determining component 808 may determine a resource set for the reference signal configuration. The determining component 808 may determine that the configured resource set is not available. In some aspects, the determining component 808 may include the above in combination with Figure 2 A transmitting processor, a receiving processor, a controller / processor, a memory, or a combination thereof of the described BS.

[0106] Figure 8 The number and arrangement of components shown in FIG. 1 are provided as an example. In practice, there may be Figure 8 Additional components, fewer components, different components, or differently arranged components than those shown in FIG. Figure 8 Two or more components shown may be implemented in a single component, or Figure 8 The single component shown may be implemented as multiple distributed components. Additionally or alternatively, Figure 8 A set (one or more components) of components shown in the figure may perform the functions described as being Figure 8 Another set of components shown in FIG. 1 performs one or more functions.

[0107] The following provides an overview of some aspects of the disclosure:

[0108] Aspect 1: A method of wireless communication performed by a user equipment (UE) includes: sending a request for information identifying a reference signal configuration using a random access channel transmission and when operating in an idle mode or an inactive mode; and selectively receiving information identifying a reference signal configuration for reception of a reference signal as a response to the request and based at least in part on a mode of the UE, wherein the reference signal is a channel state information reference signal or a tracking reference signal.

[0109] Aspect 2: The method of Aspect 1, wherein sending the request comprises: sending the request using a configured random access channel resource set.

[0110] Aspect 3: The method of aspect 2, wherein the configured random access channel resource set is a dedicated random access channel resource set used to request information identifying reference signal configuration.

[0111] Aspect 4: A method as in any one of Aspects 2 to 3, wherein the configured random access channel resource set includes at least one of a time resource configured for a random access channel opportunity, a frequency resource configured for a random access channel opportunity, or a random access channel preamble code sequence for random access channel transmission.

[0112] Aspect 5: The method of any one of aspects 1 to 4, wherein sending a request for information identifying a reference signal configuration comprises sending the request using a message 3 transmission associated with a random access procedure.

[0113] Aspect 6: The method according to any one of aspects 1 to 5, wherein the random access channel transmission does not trigger a radio resource control recovery or connection re-establishment procedure.

[0114] Aspect 7: The method according to any one of aspects 1 to 6, wherein the random access channel transmission includes a reference signal transmission request.

[0115] Aspect 8: A wireless communication method performed by a user equipment (UE) includes: when operating in a connected mode, sending a request for information identifying a reference signal configuration; and in response to the request, selectively receiving information identifying a reference signal configuration for reception of a reference signal, wherein the reference signal is a channel state information reference signal or a tracking reference signal.

[0116] Aspect 9: A method as in Aspect 8, wherein sending the request comprises: sending the request using at least one of the following: a radio resource control message, a media access control element, an uplink control information message, a tracking area update message, or a radio access network-based notification area update message.

[0117] Aspect 10: The method of any one of Aspects 8 to 9 further comprises: transitioning from an idle mode or an inactive mode to a connected mode to perform a tracking area update or a radio access network-based notification area update, and wherein sending the request comprises sending the request based at least in part on transitioning from an idle mode or an inactive mode to a connected mode.

[0118] Aspect 11: The method of any one of Aspects 8 to 10 further includes: determining a sending request, and transitioning from an idle mode or an inactive mode to a connected mode based at least in part on determining the sending request, and wherein the sending request includes a sending request based at least in part on transitioning from an idle mode or an inactive mode to a connected mode.

[0119] Aspect 12: A method of wireless communication performed by a base station (BS) includes receiving a request for information identifying a reference signal configuration from a UE; and in response to the request, selectively sending information identifying a reference signal configuration for reception of a reference signal to the UE, wherein the reference signal is a channel state information reference signal or a tracking reference signal.

[0120] Aspect 13: The method of aspect 12, wherein the UE is in an idle mode or an inactive mode, and the request is conveyed via a random access channel transmission.

[0121] Aspect 14: A method as in any of Aspects 12 to 13, wherein the UE is in connected mode and the request is sent via at least one of a radio resource control message, a media access control element, an uplink control information message, a tracking area update message, or a radio access network-based notification area update message.

[0122] Aspect 15: The method of any one of Aspects 12 to 14, further comprising: determining a resource set for reference signal configuration, and wherein selectively sending information identifying the reference signal configuration comprises sending information identifying the reference signal configuration based at least in part on determining the resource set for reference signal configuration.

[0123] Aspect 16: The method of aspect 15, wherein the resource set is a resource set configured for a connected mode UE, and wherein sending information for identifying the reference signal configuration includes sending an indicator of the resource set configured for the connected mode UE to an idle mode or inactive mode UE.

[0124] Aspect 17: A method as in any one of Aspects 15 to 16, further comprising: determining that a configured resource set is unavailable; and wherein sending information for identifying a reference signal configuration comprises: sending an indicator of a new resource set to an idle mode or inactive mode UE based at least in part on determining that the configured resource set is unavailable.

[0125] Aspect 18: An apparatus for wireless communication at a device, comprising a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of one or more aspects of aspects 1-11.

[0126] Aspect 19: A device for wireless communication, comprising a memory and one or more processors coupled to the memory, wherein the memory and the one or more processors are configured to perform the method of one or more aspects of aspects 1-11.

[0127] Aspect 20: An apparatus for wireless communication, comprising at least one component for performing the method of one or more aspects of aspects 1-11.

[0128] Aspect 21: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of one or more aspects of aspects 1-11.

[0129] Aspect 22: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions, which when executed by one or more processors of a device causes the device to perform one or more methods of aspects 1-11.

[0130] Aspect 23: An apparatus for wireless communication at a device, comprising a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of one or more aspects of aspects 12-17.

[0131] Aspect 24: A device for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform the method of one or more aspects of aspects 12-17.

[0132] Aspect 25: An apparatus for wireless communication, comprising at least one component for performing the method of one or more aspects of aspects 12-17.

[0133] Aspect 26: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of one or more aspects of aspects 12-17.

[0134] Aspect 27: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions, which when executed by one or more processors of a device causes the device to perform one or more methods of aspects 12-17.

[0135] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the described aspects.

[0136] As used herein, the term component is intended to be broadly interpreted as hardware, firmware, and / or a combination of hardware and software. As used herein, a processor is implemented with hardware, firmware, and / or a combination of hardware and software.

[0137] As used herein, satisfying a threshold may refer to a value greater than a threshold, greater than or equal to a threshold, less than or equal to a threshold, not equal to a threshold, etc., depending on the context.

[0138] It will be apparent that the systems and / or methods described herein may be implemented in various forms of hardware, firmware, and / or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit the various aspects. Therefore, the operation and behavior of these systems and / or methods are described herein without reference to specific software code—it should be understood that software and hardware can be designed to implement these systems and / or methods based at least in part on the description herein.

[0139] Although specific feature combinations are described in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of different aspects. In fact, many of these features can be combined in a manner not specifically described in the claims and / or not disclosed in the specification. Although each dependent claim listed below can be directly subordinate to only one claim, the disclosure of different aspects includes that each dependent claim is combined with each other claim in this group of claims. The phrase quoting a list of items "at least one of ..." refers to any combination of these items, including single members. As an example, "at least one of a, b or c" is intended to cover: a, b, c, ab, ac, bc and abc, and any combination with multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc and ccc, or any other ordering of a, b and c).

[0140] Elements, actions or instructions used herein should not be interpreted as critical or necessary unless explicitly described as such. Moreover, as used herein, the articles "one" and "an" are intended to include one or more items and can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more items (e.g., related items, non-related items, combinations of related items and non-related items, etc.), and can be used interchangeably with "one or more". In the case of intending to have only one item, the phrase "only one" or similar language is adopted. Moreover, as used herein, the terms "having" and the like are intended to be open terms. In addition, the phrase "based on" is intended to mean "based at least in part on", unless otherwise explicitly stated.

Claims

1. A method of wireless communication performed by a user equipment UE, comprising: transmitting using a random access channel transmission and while operating in an idle mode or an inactive mode, sending a request for information identifying a reference signal configuration; selectively receiving, in response to the request and based at least in part on a mode of the UE, information identifying the reference signal configuration for receiving a reference signal, wherein the reference signal is a channel state information reference signal or a tracking reference signal; When operating in the idle mode or the inactive mode, receiving the reference signal based at least in part on receiving information identifying the reference signal configuration; and While operating in the idle mode or the inactive mode, monitoring for paging messages in paging occasions is performed based at least in part on receiving information identifying the reference signal configuration.

2. The method according to claim 1, wherein: Sending the request includes: The request is sent using a configured set of random access channel resources.

3. The method according to claim 2, wherein: The configured random access channel resource set is a dedicated random access channel resource set used to request the information identifying the reference signal configuration.

4. The method according to claim 2, wherein: The configured random access channel resource set includes at least one of the following: The time resources configured for random access channel opportunities, a frequency resource configured for the random access channel opportunity, or A random access channel preamble sequence used for the random access channel transmission.

5. The method according to claim 1, wherein: Sending the request for information identifying a reference signal configuration comprises: The request is sent using a Message 3 transmission associated with a random access procedure.

6. The method according to claim 1, wherein: The random access channel transmission does not trigger a radio resource control recovery or connection re-establishment procedure.

7. The method according to claim 1, wherein: The random access channel transmission includes a reference signal transmission request.

8. A method of wireless communication performed by a user equipment UE, comprising: When operating in a connected mode, sending a request for information identifying a reference signal configuration; selectively receiving, in response to the request, the information identifying the reference signal configuration for receiving a reference signal, wherein the reference signal is a channel state information reference signal or a tracking reference signal; When operating in an idle mode or an inactive mode, receiving the reference signal based at least in part on receiving information identifying the reference signal configuration; and While operating in the idle mode or the inactive mode, monitoring for paging messages in paging occasions is performed based at least in part on receiving information identifying the reference signal configuration.

9. The method according to claim 8, wherein: Sending the request includes: The request is sent using at least one of: Radio Resource Control messages, Media Access Control Control Element, Uplink Control Information Message, Tracking area update messages, or Radio access network based notification area update message.

10. The method according to claim 8, further comprising: transitioning from the idle mode or the inactive mode to the connected mode to perform a tracking area update or a radio access network based notification area update; and Wherein, sending the request includes: The request is sent based at least in part on transitioning from the idle mode or the inactive mode to the connected mode.

11. The method according to claim 8, further comprising: Determine to send the request; transitioning from the idle mode or the inactive mode to the connected mode based at least in part on determining to send the request; and Wherein, sending the request includes: The request is sent based at least in part on transitioning from the idle mode or the inactive mode to the connected mode.

12. A wireless communication method performed by a base station BS, comprising: receiving a request for information identifying a reference signal configuration from a user equipment UE; selectively sending, in response to the request, to the UE the information identifying the reference signal configuration for receiving a reference signal, wherein the reference signal is a channel state information reference signal or a tracking reference signal; When the UE is in an idle mode or an inactive mode, transmitting the reference signal based at least in part on transmitting information identifying the reference signal configuration; and When the UE is in the idle mode or the inactive mode, a paging message is sent in a paging occasion based at least in part on sending the information identifying the reference signal configuration.

13. The method according to claim 12, wherein: receiving the request while the UE is in the idle mode or the inactive mode, and Therein, the request is communicated via a random access channel transmission.

14. The method according to claim 12, wherein: receiving the request while the UE is in connected mode, and The request is communicated via at least one of the following: Radio Resource Control messages, Media Access Control Control Element, Uplink Control Information Message, Tracking area update messages, or Radio access network based notification area update message.

15. The method according to claim 12, further comprising: determining a resource set for the reference signal configuration; and The selectively sending the information identifying the reference signal configuration includes: The information identifying the reference signal configuration is sent based at least in part on determining the set of resources for the reference signal configuration.

16. The method according to claim 15, wherein: The resource set is a configured resource set of a connected mode UE; and The sending of information identifying the reference signal configuration includes: An indicator of the configured resource set for the connected mode UE is sent to an idle mode or inactive mode UE.

17. The method according to claim 15, further comprising: Determine that the configured set of resources is unavailable; and The sending of information identifying the reference signal configuration includes: Based at least in part on determining that the configured set of resources is unavailable, an indicator of a new set of resources is sent to an idle mode or inactive mode UE.

18. A user equipment UE for wireless communication, comprising: Memory; as well as one or more processors coupled to the memory, the one or more processors configured to: transmitting using a random access channel transmission and while operating in an idle mode or an inactive mode, sending a request for information identifying a reference signal configuration; selectively receiving, in response to the request and based at least in part on a mode of the UE, information identifying the reference signal configuration for receiving a reference signal, wherein the reference signal is a channel state information reference signal or a tracking reference signal; When operating in an idle mode or an inactive mode, receiving the reference signal based at least in part on receiving information identifying the reference signal configuration; and While operating in the idle mode or the inactive mode, monitoring for paging messages in paging occasions is performed based at least in part on receiving information identifying the reference signal configuration.

19. The UE according to claim 18, wherein: The one or more processors, when sending the request, are configured to: The request is sent using a configured set of random access channel resources.

20. The UE according to claim 19, wherein: The configured random access channel resource set is a dedicated random access channel resource set used to request the information identifying the reference signal configuration.

21. The UE according to claim 19, wherein: The configured random access channel resource set includes at least one of the following: The time resources configured for random access channel opportunities, a frequency resource configured for the random access channel opportunity, or A random access channel preamble sequence used for the random access channel transmission.

22. The UE according to claim 18, wherein: The one or more processors, when sending the request for information identifying a reference signal configuration, are configured to: The request is sent using a Message 3 transmission associated with a random access procedure.

23. The UE according to claim 18, wherein: The random access channel transmission does not trigger a radio resource control recovery or connection re-establishment procedure.

24. The UE according to claim 18, wherein: The random access channel transmission includes a reference signal transmission request.

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