Techniques for scheduling of channel state information reference signals and feedback during random access channel operation

Abstract

Various aspects of this disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may receive a Channel State Information (CSI) Reference Signal (CSI-RS) indication that corresponds to a set of resources scheduled to be transmitted to the UE. Upon receiving the CSI-RS indication, the UE may transmit a UE identification message corresponding to random access channel operation, wherein the UE identification message includes CSI feedback corresponding to the CSI-RS. Numerous other aspects are provided.

Description

[0001] Cross-reference to related applications

[0002] This patent application claims priority to U.S. non-provisional patent application No. 16 / 949,500, filed on October 30, 2020, entitled “TECHNIQUES FORSCHEDULING OF CHANNEL STATE INFORMATION REFERENCE SIGNALS AND FEEDBACK DURINGA RANDOM ACCESS CHANNEL OPERATION”, which is expressly incorporated herein by reference. Technical Field

[0003] Various aspects of this disclosure generally relate to wireless communications, as well as techniques and apparatus for scheduling channel state information reference signals and feedback during random access channel operation. Background Technology

[0004] Wireless communication systems are widely deployed to provide a variety of telecommunications services, such as telephone, video, data, messaging, and broadcasting. Typical wireless communication systems 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 / Improved LTE is an enhancement set of the Universal Mobile Telecommunications System (UMTS) mobile standard issued by the 3rd Generation Partnership Project (3GPP).

[0005] A wireless network may include multiple base stations (BSs), each capable of supporting communication for multiple user equipment (UEs). UEs can communicate with the base stations (BSs) via downlinks and uplinks. A downlink (or forward link) refers to the communication link from the BS to the UE, while an uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, Access Point (AP), Radio Headend, Transmit / Receive Point (TRP), New Radio (NR) BS, 5G Node B, etc.

[0006] The multiple access technologies described above have been adopted in various telecommunications standards to provide a common protocol enabling different user equipment to communicate at the city, country, region, and even global levels. New Radio (NR) (which can also be referred to as 5G) is an evolution set of the LTE mobile standard released by the 3rd Generation Partnership Project (3GPP). NR is designed to better support mobile broadband internet access by improving spectrum efficiency, reducing costs, improving service, utilizing new spectrum, and using Orthogonal Frequency Division Multiplexing (OFDM) with a Cyclic Prefix (CP) on the downlink (DL) (CP-OFDM), and using CP-OFDM and / or SC-FDM (e.g., also known as Discrete Fourier Transform Extended OFDM (DFT-s-OFDM)) on the uplink (UL) for better integration with other open standards, as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technologies and carrier aggregation. As the demand for mobile broadband access continues to increase, further improvements to LTE, NR, and other radio access technologies remain useful. Summary of the Invention

[0007] In some aspects, a method of wireless communication performed by a user equipment (UE) includes: receiving a channel state information (CSI) reference signal (CSI-RS) indication, the CSI-RS indication indicating a resource set corresponding to a CSI-RS scheduled to be transmitted to the UE; and after receiving the CSI-RS indication, transmitting a UE identification message corresponding to a random access channel (RACH) operation, wherein the UE identification message includes CSI feedback corresponding to the CSI-RS.

[0008] In some aspects, the method includes receiving a Random Access Response (RAR) message that includes a CSI-RS indication.

[0009] In some respects, the resource set corresponding to CSI-RS is explicitly scheduled via RAR messages.

[0010] In some respects, the resource set corresponding to CSI-RS is implicitly indicated at least in part based on at least one of the following: resources corresponding to RAR messages, resources corresponding to UE identification messages, rules defined in the wireless communication specification, or the values ​​of bit fields in RAR messages.

[0011] In some respects, RAR messages include CSI feedback indications that correspond to one or more resources.

[0012] In some respects, CSI feedback indications are used to indicate at least one of the following: CSIs to be included in CSI feedback, or parameters associated with CSI feedback.

[0013] In some respects, CSI feedback is carried as uplink control information on the physical uplink shared channel.

[0014] In some respects, the resource set corresponding to CSI-RS includes at least one of the following: time-domain resources or frequency-domain resources.

[0015] In some aspects, a method of wireless communication performed by a base station includes: before the UE transmits a UE identification message corresponding to a RACH operation, transmitting a CSI-RS indication, the CSI-RS indication indicating a resource set corresponding to a CSI-RS scheduled to be transmitted to the UE; and receiving a UE identification message, wherein the UE identification message includes CSI feedback corresponding to the CSI-RS.

[0016] In some aspects, the method includes sending a RAR message that includes a CSI-RS indication.

[0017] In some respects, the resource set corresponding to CSI-RS is explicitly scheduled via RAR messages.

[0018] In some respects, the resource set corresponding to CSI-RS is implicitly indicated at least in part based on at least one of the following: resources corresponding to RAR messages, resources corresponding to UE identification messages, rules defined in the wireless communication specification, or the values ​​of bit fields in RAR messages.

[0019] In some respects, RAR messages include CSI feedback indications that correspond to one or more resources.

[0020] In some respects, CSI feedback indications are used to indicate at least one of the following: CSIs to be included in CSI feedback, or parameters associated with CSI feedback.

[0021] In some respects, CSI feedback is carried as uplink control information on the physical uplink shared channel.

[0022] In some respects, the resource set corresponding to CSI-RS includes at least one of the following: time-domain resources or frequency-domain resources.

[0023] In some aspects, a UE for wireless communication includes a memory and one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: receive a CSI-RS indication, the CSI-RS indication being used to indicate a resource set corresponding to a CSI-RS scheduled to be sent to the UE; and, after receiving the CSI-RS indication, send a UE identification message corresponding to RACH operation, wherein the UE identification message includes CSI feedback corresponding to the CSI-RS.

[0024] In some respects, one or more processors are also configured to receive RAR messages including CSI-RS indications.

[0025] In some respects, the resource set corresponding to CSI-RS is explicitly scheduled via RAR messages.

[0026] In some respects, the resource set corresponding to CSI-RS is implicitly indicated at least in part based on at least one of the following: resources corresponding to RAR messages, resources corresponding to UE identification messages, rules defined in the wireless communication specification, or the values ​​of bit fields in RAR messages.

[0027] In some respects, RAR messages include CSI feedback indications that correspond to one or more resources.

[0028] In some respects, CSI feedback indications are used to indicate at least one of the following: CSIs to be included in CSI feedback, or parameters associated with CSI feedback.

[0029] In some respects, CSI feedback is carried as uplink control information on the physical uplink shared channel.

[0030] In some respects, the resource set corresponding to CSI-RS includes at least one of the following: time-domain resources or frequency-domain resources.

[0031] In some aspects, a base station for wireless communication includes a memory and one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: transmit a CSI-RS indication prior to the transmission of a UE identification message corresponding to RACH operation, the CSI-RS indication indicating a resource set corresponding to a CSI-RS scheduled to be transmitted to the UE; and receive a UE identification message, wherein the UE identification message includes CSI feedback corresponding to the CSI-RS.

[0032] In some respects, one or more processors are also configured to send RAR messages that include CSI-RS indications.

[0033] In some respects, the resource set corresponding to CSI-RS is explicitly scheduled via RAR messages.

[0034] In some respects, the resource set corresponding to CSI-RS is implicitly indicated at least in part based on at least one of the following: resources corresponding to RAR messages, resources corresponding to UE identification messages, rules defined in the wireless communication specification, or the values ​​of bit fields in RAR messages.

[0035] In some respects, RAR messages include CSI feedback indications that correspond to one or more resources.

[0036] In some respects, CSI feedback is carried as uplink control information on the physical uplink shared channel.

[0037] In some respects, the resource set corresponding to CSI-RS includes at least one of the following: time-domain resources or frequency-domain resources.

[0038] In some respects, CSI feedback indications are used to indicate at least one of the following: CSIs to be included in CSI feedback, or parameters associated with CSI feedback.

[0039] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a UE, cause the UE to perform the following actions: receive a CSI-RS indication, the CSI-RS indication indicating a set of resources corresponding to a CSI-RS scheduled to be sent to the UE; and, after receiving the CSI-RS indication, send a UE identification message corresponding to a RACH operation, wherein the UE identification message includes CSI feedback corresponding to the CSI-RS.

[0040] In some respects, one or more instructions further enable the UE to receive a RAR message including a CSI-RS indication.

[0041] In some respects, the resource set corresponding to CSI-RS is explicitly scheduled via RAR messages.

[0042] In some respects, the resource set corresponding to CSI-RS is implicitly indicated at least in part based on at least one of the following: resources corresponding to RAR messages, resources corresponding to UE identification messages, rules defined in the wireless communication specification, or the values ​​of bit fields in RAR messages.

[0043] In some respects, RAR messages include CSI feedback indications that correspond to one or more resources.

[0044] In some respects, CSI feedback indications are used to indicate at least one of the following: CSIs to be included in CSI feedback, or parameters associated with CSI feedback.

[0045] In some respects, CSI feedback is carried as uplink control information on the physical uplink shared channel.

[0046] In some respects, the resource set corresponding to CSI-RS includes at least one of the following: time-domain resources or frequency-domain resources.

[0047] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a base station, cause the base station to perform the following actions: before the transmission of a UE identification message corresponding to a RACH operation, transmit a CSI-RS indication, the CSI-RS indication indicating a set of resources corresponding to a CSI-RS scheduled to be transmitted to the UE; and receive a UE identification message, wherein the UE identification message includes CSI feedback corresponding to the CSI-RS.

[0048] In some respects, one or more instructions further cause the base station to send a RAR message including a CSI-RS indication.

[0049] In some respects, the resource set corresponding to CSI-RS is explicitly scheduled via RAR messages.

[0050] In some respects, the resource set corresponding to CSI-RS is implicitly indicated at least in part based on at least one of the following: resources corresponding to RAR messages, resources corresponding to UE identification messages, rules defined in the wireless communication specification, or the values ​​of bit fields in RAR messages.

[0051] In some respects, RAR messages include CSI feedback indications that correspond to one or more resources.

[0052] In some respects, CSI feedback indications are used to indicate at least one of the following: CSIs to be included in CSI feedback, or parameters associated with CSI feedback.

[0053] In some respects, CSI feedback is carried as uplink control information on the physical uplink shared channel.

[0054] In some respects, the resource set corresponding to CSI-RS includes at least one of the following: time-domain resources or frequency-domain resources.

[0055] In some aspects, an apparatus for wireless communication includes: a unit for receiving a CSI-RS indication, the CSI-RS indication indicating a resource set corresponding to a CSI-RS scheduled to be sent to the apparatus; and a unit for sending a UE identification message corresponding to a RACH operation after receiving the CSI-RS indication, wherein the UE identification message includes CSI feedback corresponding to the CSI-RS.

[0056] In some aspects, the apparatus includes a unit for receiving a RAR message including a CSI-RS indication.

[0057] In some respects, the resource set corresponding to CSI-RS is explicitly scheduled via RAR messages.

[0058] In some respects, the resource set corresponding to CSI-RS is implicitly indicated at least in part based on at least one of the following: resources corresponding to RAR messages, resources corresponding to UE identification messages, rules defined in the wireless communication specification, or the values ​​of bit fields in RAR messages.

[0059] In some respects, RAR messages include CSI feedback indications that correspond to one or more resources.

[0060] In some respects, CSI feedback indications are used to indicate at least one of the following: CSIs to be included in CSI feedback, or parameters associated with CSI feedback.

[0061] In some respects, CSI feedback is carried as uplink control information on the physical uplink shared channel.

[0062] In some respects, the resource set corresponding to CSI-RS includes at least one of the following: time-domain resources or frequency-domain resources.

[0063] In some aspects, an apparatus for wireless communication includes: a unit for transmitting a CSI-RS indication prior to the transmission of a UE identification message corresponding to RACH operation, the CSI-RS indication indicating a resource set corresponding to a CSI-RS scheduled to be transmitted to the UE; and a unit for receiving the UE identification message, wherein the UE identification message includes CSI feedback corresponding to the CSI-RS.

[0064] In some aspects, the apparatus includes a unit for transmitting a RAR message including a CSI-RS indication.

[0065] In some respects, the resource set corresponding to CSI-RS is explicitly scheduled via RAR messages.

[0066] In some respects, the resource set corresponding to CSI-RS is implicitly indicated at least in part based on at least one of the following: resources corresponding to RAR messages, resources corresponding to UE identification messages, rules defined in the wireless communication specification, or the values ​​of bit fields in RAR messages.

[0067] In some respects, RAR messages include CSI feedback indications that correspond to one or more resources.

[0068] In some respects, CSI feedback indications are used to indicate at least one of the following: CSIs to be included in CSI feedback, or parameters associated with CSI feedback.

[0069] In some respects, CSI feedback is carried as uplink control information on the physical uplink shared channel.

[0070] In some respects, the resource set corresponding to CSI-RS includes at least one of the following: time-domain resources or frequency-domain resources.

[0071] In some respects, as fully described herein with reference to the accompanying drawings and description, and as illustrated by the accompanying drawings and description, methods, apparatus, devices, computer program products, non-transitory computer-readable media, user equipment, base stations, nodes, wireless communication devices and / or processing systems.

[0072] The features and technical advantages of the examples according to this disclosure have been summarized quite broadly above to better understand the following specific embodiments. Additional features and advantages will be described below. The disclosed concepts and specific examples can be readily used as the basis for modifying or designing other structures for performing the same purpose of this disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein (both their organization and operation) and their associated advantages will be better understood from the following description when considered in conjunction with the accompanying drawings. Each drawing in the accompanying drawings is provided for illustrative and descriptive purposes and is not intended to define the scope of the claims. Attached Figure Description

[0073] To gain a detailed understanding of the features of this disclosure, a more specific description of the content briefly outlined above can be obtained by referring to various aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings illustrate only certain typical aspects of this disclosure and are therefore not to be considered as limiting its scope, as the specification may acknowledge other equivalent aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0074] Figure 1 This is a diagram illustrating examples of wireless networks according to various aspects of this disclosure.

[0075] Figure 2 This is a diagram illustrating an example of communication between a base station and a UE in a wireless network according to various aspects of this disclosure.

[0076] Figure 3 This is a diagram illustrating an example of a four-step random access process according to various aspects of this disclosure.

[0077] Figure 4 This is a diagram illustrating examples of techniques associated with scheduling of Channel State Information (CSI) Reference Signals (RS) and feedback during Random Access Channel (RACH) operation, according to various aspects of this disclosure.

[0078] Figure 5 and Figure 6 This is a diagram illustrating an example process associated with the scheduling techniques used for CSI-RS and feedback during RACH operation, according to various aspects of this disclosure.

[0079] Figure 7 and Figure 8 This is a block diagram of an example device for wireless communication according to various aspects of this disclosure. Detailed Implementation

[0080] The various aspects of this disclosure are described more fully below with reference to the accompanying drawings. However, this disclosure may be embodied in many different forms and should not be construed as limited to any particular structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art will understand that the scope of this disclosure is intended to cover any aspect of the disclosure herein, whether implemented independently or in combination with any other aspect of this disclosure. For example, an apparatus or method may be implemented using any number of the aspects set forth herein. Furthermore, the scope of this disclosure is intended to cover such apparatus or methods implemented using structures, functions, or structures and functions other than those set forth herein or different from those set forth herein. It should be understood that any aspect of the disclosure herein may be embodied by one or more elements of the claims.

[0081] Some aspects of a telecommunications system will now be described with reference to various devices and techniques. These devices and techniques will be described in the following specific embodiments and illustrated in the accompanying drawings by various frames, 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 an element is implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0082] It should be noted that although the aspects may be described herein using terms commonly associated with 5G or NR radio access technology (RAT), the aspects of this disclosure may be applied to other RATs, such as 3G RAT, 4G RAT and / or RATs after 5G (e.g., 6G).

[0083] Figure 1This is a diagram illustrating an example of a wireless network 100 according to various aspects of this disclosure. The wireless network 100 may be a 5G (NR) network, an LTE network, etc., or may include elements of a 5G (NR) network, an LTE network, etc. The wireless network 100 may include multiple base stations 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A base station (BS) is an entity that communicates with a user equipment (UE) and may also be referred to as an 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, depending on the context in which the term "cell" is used, the term "cell" may refer to the coverage area of ​​a BS and / or the BS subsystem serving that coverage area.

[0084] A BS can provide communication coverage for macrocells, picocells, femtocells, and / or another type of cell. A macrocell can cover a relatively large geographic area (e.g., a radius of several kilometers) and can allow unrestricted access by UEs with a service subscription. A picocell can cover a relatively small geographic area and can allow unrestricted access by UEs with a service subscription. A femtocell can cover a relatively small geographic area (e.g., a residential area) and can allow restricted access by UEs associated with that femtocell (e.g., UEs in a closed user group (CSG)). A BS used for macrocells can be referred to as a macro BS. A BS used for picocells can be referred to as a pico BS. A BS used for femtocells can be referred to as a femtocell BS or a home BS. Figure 1 In the example shown, BS 110a can be a macro BS for macro cell 102a, BS 110b can be a pico BS for pico cell 102b, and BS 110c can be a femto BS for femto cell 102c. A BS can support one or more (e.g., three) cells. The terms “eNB,” “base station,” “NR BS,” “gNB,” “TRP,” “AP,” “Node B,” “5G NB,” and “cell” are used interchangeably herein.

[0085] In some respects, the cell may not be stationary, and the geographical area of ​​the cell may move depending on the location of the mobile BS. In some respects, BSs may use any suitable transport network to interconnect with each other and / or interconnect 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, etc.).

[0086] 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 can also be a UE capable of relaying transmissions to other UEs. Figure 1 In the example shown, relay BS 110d can communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120d. A relay BS can also be referred to as a relay station, relay base station, repeater, etc.

[0087] Wireless network 100 can be a heterogeneous network comprising different types of Base Stations (BSs) (e.g., macro BSs, pico BSs, femto BSs, repeater BSs, etc.). These different types of BSs can have different transmit power levels, different coverage areas, and different effects on interference in wireless network 100. For example, macro BSs can have high transmit power levels (e.g., 5 to 40 watts), while pico BSs, femto BSs, and repeater BSs can have lower transmit power levels (e.g., 0.1 to 2 watts).

[0088] Network controller 130 can be coupled to a group of base stations (BSs) and can provide coordination and control for these BSs. Network controller 130 can communicate with these BSs via backhaul. For example, BSs can also communicate with each other directly or indirectly via wireless or wired backhaul.

[0089] UE 120 (e.g., 120a, 120b, 120c) may be distributed throughout the wireless network 100, and each UE may be stationary or mobile. UE may also be referred to as an access terminal, terminal, mobile station, user unit, station, etc. UE may be a cellular phone (e.g., a smartphone), personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, laptop computer, cordless phone, wireless local loop (WLL) station, tablet device, camera, gaming device, netbook, smartbook, ultrabook, medical device or equipment, biosensor / device, wearable device (smartwatch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), entertainment device (e.g., music or video device, or satellite radio unit), vehicle component or sensor, smart meter / sensor, industrial manufacturing equipment, GPS device, or any other suitable device configured to communicate via wireless or wired media.

[0090] Some UEs can be considered as Machine-Type Communication (MTC) UEs or evolved or enhanced Machine-Type Communication (eMTC) UEs. For example, MTC and eMTC UEs include robots, drones, remote devices, sensors, meters, monitors, location tags, etc., capable of communicating with a base station, another device (e.g., a remote device), or some other entity. For example, a wireless node can provide connectivity to or from a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs can be considered as Internet of Things (IoT) devices and / or can be implemented as NB-IoT (Narrowband Internet of Things) devices. Some UEs can be considered as Customer Premises Equipment (CPE). UE 120 can be included in a housing that houses the components of UE 120 (e.g., processor components, memory components, etc.). In some aspects, the processor components and memory components can be coupled together. For example, the processor components (e.g., one or more processors) and memory components (e.g., memory) can be operatively coupled, communicatively coupled, electrically coupled, electronically coupled, etc.

[0091] Typically, any number of wireless networks can be deployed in a given geographical area. Each wireless network can support a specific RAT and can operate on one or more frequencies. A RAT can also be referred to as a radio technology, air interface, etc. A frequency can also be referred to as a carrier, frequency channel, etc. Each frequency can support a single RAT in a given geographical area to avoid interference between wireless networks using different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0092] In some respects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using base station 110 as an intermediary device for communication with each other). 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, mesh networks, and so on). 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.

[0093] Devices in the wireless network 100 can communicate using the electromagnetic spectrum, which can be subdivided into various categories, bands, channels, etc., based on frequency or wavelength. For example, devices in the wireless network 100 can communicate using an operating band with a first frequency range (FR1) (spanning from 410 MHz to 7.125 GHz), and / or can communicate using an operating band with a second frequency range (FR2) (spanning from 24.25 GHz to 52.6 GHz). Frequencies between FR1 and FR2 are generally referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to as the "sub-6 GHz" band. Similarly, although different from the Extremely High Frequency (EHF) band (30 GHz–300 GHz) designated as the "millimeter wave" band by the International Telecommunication Union (ITU), FR2 is often referred to as the "millimeter wave" band. Therefore, unless otherwise explicitly stated, it should be understood that the terms "sub-6 GHz," etc. (if used herein), can broadly refer to frequencies less than 6 GHz, frequencies within FR1, and / or intermediate frequency band frequencies (e.g., greater than 7.125 GHz). Similarly, unless otherwise explicitly stated, it should be understood that the terms "millimeter wave," etc. (if used herein), can broadly refer to frequencies within the EHF band, frequencies within FR2, and / or intermediate frequency band frequencies (e.g., less than 24.25 GHz). It is anticipated that the frequencies included in FR1 and FR2 can be modified, and the techniques described herein can be applied to these modified frequency ranges.

[0094] As indicated above, Figure 1 This is provided as an example. Other examples can be found in the reference. Figure 1 The descriptions are different.

[0095] Figure 2 This is a diagram illustrating an example 200 of communication between a base station 110 and a UE 120 in a wireless network 100 according to various aspects of this disclosure. The base station 110 may be equipped with T antennas 234a to 234t, and the UE 120 may be equipped with R antennas 252a to 252r, wherein typically T ≥ 1 and R ≥ 1.

[0096] At base station 110, transmit processor 220 can receive data for one or more UEs from data source 212, select one or more modulation and coding schemes (MCS) for the UE based at least in part on the channel quality index (CQI) received from each UE, process the data for the UE (e.g., coding and modulation) based at least in part on the MCS selected for each UE, and provide data symbols for all UEs. Transmit processor 220 can also process system information (e.g., for semi-static resource allocation information (SRPI), etc.) and control information (e.g., CQI requests, permission, upper-layer signaling, etc.), and provide overhead symbols and control symbols. Transmit processor 220 can also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS), demodulation reference signals (DMRS), etc.) and synchronization signals (e.g., primary synchronization signal (PSS) and secondary synchronization signal (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding, if applicable) on data symbols, control symbols, overhead symbols, and / or reference symbols, and provide T output symbol streams to T modulators (MODs) 232a to 232t. Each modulator 232 can process its corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 can 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 can be transmitted via T antennas 234a to 234t, respectively.

[0097] At UE 120, antennas 252a to 252r can receive downlink signals from base station 110 and / or other base stations, and can provide the received signals to demodulators (DEMODs) 254a to 254r respectively. Each demodulator 254 can adjust (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain an input sample. Each demodulator 254 can further process the input sample (e.g., for OFDM, etc.) to obtain the received symbols. MIMO detector 256 can obtain the received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols (if applicable), and provide the detected symbols. Receive processor 258 can process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to data sink 260, and provide decoded control information and system information to controller / processor 280. The term "controller / processor" can refer to one or more controllers, one or more processors, or a combination thereof. The channel processor can determine the Received Reference Signal Power (RSRP), Received Signal Strength Indicator (RSSI), Received Reference Signal Quality (RSRQ), Channel Quality Indicator (CQI), and so on. In some respects, one or more components of the UE 120 may be included in the housing 284.

[0098] Network controller 130 may include communication unit 294, controller / processor 290, and memory 292. For example, network controller 130 may include one or more devices in the core network. Network controller 130 may communicate with base station 110 via communication unit 294.

[0099] On the uplink, at UE 120, transmit processor 264 can receive and process data from data source 262 and control information from controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). Transmit processor 264 can also generate reference symbols for one or more reference signals. Symbols from transmit processor 264 can be pre-coded (if applicable) by TX MIMO processor 266, further processed by modulators 254a to 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to base station 110. In some aspects, UE 120 includes a transceiver. The transceiver can include any combination of antenna 252, modulator and / or demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, and / or TX MIMO processor 266. The processor (e.g., controller / processor 280) and memory 282 may use a transceiver to perform aspects of any of the methods described herein.

[0100] At base station 110, uplink signals from UE 120 and other UEs can be received by antenna 234, processed by demodulator 232, detected by MIMO detector 236 (if applicable), and further processed by receiver processor 238 to obtain decoded data and control information transmitted by UE 120. Receiver processor 238 can provide decoded data to data sink 239 and decoded control information to controller / processor 240. Base station 110 may include communication unit 244 and can communicate with network controller 130 via communication unit 244. Base station 110 may include scheduler 246 to schedule UE 120 for downlink and / or uplink communication. In some aspects, base station 110 includes a transceiver. The transceiver may include any combination of antenna 234, modulator and / or demodulator 232, MIMO detector 236, receiver processor 238, transmitter processor 220, and / or TX MIMO processor 230. The processor (e.g., controller / processor 240) and memory 242 may use a transceiver to perform aspects of any of the methods described herein.

[0101] The controller / processor 240 of base station 110, the controller / processor 280 of UE 120 and / or Figure 2 Any other components may perform one or more techniques associated with scheduling of Channel State Information (CSI) Reference Signals (RS) and feedback during Random Access Channel (RACH) operation, as described in more detail elsewhere herein. For example, the controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other component can perform or direct, for example Figure 5 Process 500 Figure 6 The operation of process 600 and / or other processes as described herein. Memory 242 and memory 282 may store data and program code 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, one or more instructions, when executed by one or more processors of base station 110 and / or UE 120 (e.g., directly or after compilation, translation, interpretation, etc.), may cause one or more processors, UE 120 and / or base station 110 to perform or direct, for example... Figure 5 Process 500 Figure 6 The operation of process 600 and / or other processes described herein. In some aspects, execution instructions may include run instructions, translation instructions, compilation instructions, interpretation instructions, etc.

[0102] In some aspects, UE 120 may include: a unit for receiving a CSI-RS indication, the CSI-RS indication indicating a resource set corresponding to a CSI-RS scheduled to be sent to the UE; and a unit for sending a UE identification message corresponding to a RACH operation after receiving the CSI-RS indication, wherein the UE identification message includes CSI feedback corresponding to the CSI-RS, etc. In some aspects, such a unit may include a combination of... Figure 2 One or more components of the described UE 120, 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.

[0103] In some aspects, base station 110 may include: a unit for transmitting a CSI-RS indication before the UE transmits a UE identification message corresponding to RACH operation, the CSI-RS indication indicating a resource set corresponding to a CSI-RS scheduled to be transmitted to the UE; and a unit for receiving a UE identification message, wherein the UE identification message includes CSI feedback corresponding to the CSI-RS, etc. In some aspects, such a unit may include a combination of... Figure 2 One or more components of the described base station 110, such as antenna 234, DEMOD 232, MIMO detector 236, receiver processor 238, controller / processor 240, transmitter processor 220, TX MIMO processor 230, MOD 232, antenna 234, etc.

[0104] As indicated above, Figure 2 This is provided as an example. Other examples can be found in the reference. Figure 2 The examples described are different.

[0105] Figure 3 This is a diagram illustrating an example of a four-step RACH operation according to various aspects of this disclosure. (See diagram for example.) Figure 3 As shown, base station 110 and UE 120 can communicate with each other to perform a four-step random access procedure.

[0106] As indicated by reference numeral 305, base station 110 may transmit one or more synchronization signal blocks (SSBs) and random access configuration information, which UE 120 may receive. In some aspects, the random access configuration information may be transmitted in system information (e.g., in one or more system information blocks (SIBs), etc.) and / or indicated by system information and / or SSBs, for example, for contention-based random access. Alternatively or additionally, the random access configuration information may be transmitted in radio resource control (RRC) messages and / or physical downlink control channel (PDCCH) command messages that trigger the RACH procedure, for example, for contention-free random access. The random access configuration information may include one or more parameters to be used in the random access procedure, such as one or more parameters for transmitting a random access message (RAM), one or more parameters for receiving a random access response (RAR), etc.

[0107] As shown by reference numeral 310, UE 120 can transmit a RAM with a RACH request via the Physical Random Access Channel (PRACH). The RAM may include a preamble (sometimes called a random access preamble, PRACH preamble, RAM preamble, etc.). In the four-step random access process, the message including the preamble may be referred to as message 1, msg1, MSG1, first message, initial message, etc. The random access message may include a random access preamble identifier.

[0108] As indicated by reference numeral 315, base station 110 may send a RAR as a response to the preamble. In the four-step random access process, the message including the RAR may be referred to as message 2, msg2, MSG2, or the second message. In some aspects, the RAR may indicate the detected random access preamble identifier (e.g., received from UE 120 in msg1). Alternatively or additionally, the RAR may indicate the resource allocation to be used by UE 120 to send message 3 (msg3).

[0109] In some aspects, as part of the second step of the four-step random access procedure, base station 110 may transmit PDCCH communication for RAR. The PDCCH communication may schedule Physical Downlink Shared Channel (PDSCH) communication, including RAR. For example, the PDCCH communication may indicate resource allocation for PDSCH communication. Also as part of the second step of the four-step random access procedure, base station 110 may transmit PDSCH communication for RAR, as scheduled via PDCCH communication. RAR may be included in the MAC PDU of the PDSCH communication.

[0110] As indicated by reference numeral 320, UE 120 may send an RRC connection request message. The RRC connection request message may be referred to as message 3, msg3, MSG3, UE identification message, or the third message of the four-step random access procedure. In some aspects, the RRC connection request may include the UE identifier, UCI, Physical Uplink Shared Channel (PUSCH) communication (e.g., the RRC connection request), etc.

[0111] As shown by reference numeral 325, base station 110 can send an RRC connection establishment message. The RRC connection establishment message may be referred to as message 4, msg4, MSG4, or the fourth message of the four-step random access procedure. In some aspects, the RRC connection establishment message may include the detected UE identifier, timing advance value, contention resolution information, etc. As shown by reference numeral 330, if UE 120 successfully receives the RRC connection establishment message, UE 120 can send a Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK).

[0112] As indicated above, Figure 3 This is provided as an example. Other examples can be found in the reference. Figure 3 The descriptions are different.

[0113] RACH operations may have coverage limitations, which can negatively impact network performance. In some cases, RACH messages in the frequency range of approximately 24 GHz or higher may be missed by the UE or incorrectly decoded by the UE. As a result, RRC connection establishment messages may not be transmitted effectively, thus jeopardizing network connectivity.

[0114] The aspects of the techniques described in this paper can facilitate beam refinement during RACH operation. For example, these aspects can enable the base station to schedule CSI-RS before transmitting the UE identification message. In this way, the UE can receive the CSI-RS and provide CSI feedback in the UE identification message. Therefore, these aspects can achieve beam refinement during RACH operation, which can lead to enhanced coverage for RRC connections, positively impacting network performance.

[0115] Figure 4 This is a diagram illustrating example 400 of the techniques associated with scheduling for CSI-RS and feedback during RACH operation, according to various aspects of this disclosure. Figure 4 As shown, base station 110 and UE 120 can communicate with each other.

[0116] As indicated by reference numeral 405, base station 110 may transmit a CSI-RS indication, and UE 120 may receive a CSI-RS indication. The CSI-RS indication may indicate a set of resources corresponding to a CSI-RS scheduled to be transmitted to UE 120 before UE 120 transmits a UE identification message corresponding to RACH operation. The set of resources corresponding to the CSI-RS may include time-domain resources and / or frequency-domain resources. In some aspects, the CSI feedback indication may also indicate a CSI report that UE 120 will transmit as part of the PUSCH portion of the UE identification message. The CSI feedback indication may additionally or alternatively indicate the configuration for the CSI report, the CSI parameters to be transmitted by the UE, etc.

[0117] As indicated by reference numeral 410, base station 110 can send a RAR message corresponding to a RACH operation, and UE 120 can receive a RAR message corresponding to a RACH operation. As indicated by the dashed arrow, base station 110 can send a CSI-RS indication before or after sending the RAR message corresponding to the RACH operation.

[0118] In some aspects, the RAR message may include a CSI-RS indication. In some aspects, the resource set corresponding to the CSI-RS can be explicitly scheduled via the RAR message. In some aspects, the resource set corresponding to the CSI-RS can be implicitly indicated via the RAR message. For example, the resource set may be implicitly indicated based at least in part on at least one of the following: resources corresponding to the RAR message, resources corresponding to the UE identification message, rules defined in the wireless communication specification, or the values ​​of bit fields in the RAR message.

[0119] As shown by reference numeral 415, base station 110 can transmit CSI-RS, and UE 120 can receive CSI-RS. As shown by reference numeral 420, UE 120 can transmit a UE identification message corresponding to RACH operation, and base station 110 can receive a UE identification message corresponding to RACH operation. The UE identification message may include CSI feedback corresponding to CSI-RS. In some aspects, the CSI feedback may be carried in the PUSCH portion of the UE identification message. In some aspects, the CSI feedback may be carried as uplink control information (UCI) on the PUSCH. For example, the CSI feedback may be constructed according to the UCI on the PUSCH structure specified in the wireless communication standard.

[0120] Based on the technical aspects discussed above, CSI-RS scheduling for beam refinement can be performed after RACH operation has begun but before the UE identification message is sent. In this way, coverage enhancement associated with beam refinement during RACH operation can be achieved, which can positively impact network performance.

[0121] As indicated above, Figure 4 This is provided as an example. Other examples can be found in the reference. Figure 4 The examples described are different.

[0122] Figure 5 This is a diagram illustrating, for example, an example procedure 500 performed by a UE according to various aspects of this disclosure. Example procedure 500 is an example of an operation performed by a UE (e.g., UE 120) in connection with techniques used for scheduling CSI-RS and feedback during RACH operation.

[0123] like Figure 5 As shown, in some aspects, process 500 may include: receiving a CSI-RS indication, the CSI-RS indication being used to indicate a resource set corresponding to a CSI-RS scheduled to be sent to the UE (block 510). For example, the UE may (e.g., using...) Figure 7 The receiving component 702 described herein receives a CSI-RS indication, which is used to indicate the resource set corresponding to the CSI-RS scheduled to be sent to the UE, as described above.

[0124] like Figure 5 As further shown, in some aspects, process 500 may include: after receiving the CSI-RS indication, sending a UE identification message corresponding to the RACH operation, wherein the UE identification message includes CSI feedback corresponding to the CSI-RS (block 520). For example, the UE may (e.g., using...) Figure 7 After receiving the CSI-RS indication, the transmission component 704 described herein sends a UE identification message corresponding to the RACH operation, wherein the UE identification message includes CSI feedback corresponding to the CSI-RS, as described above.

[0125] Process 500 may include additional aspects, such as any single aspect or any combination thereof described below and / or in conjunction with one or more other processes described elsewhere in this document.

[0126] In the first aspect, process 500 includes: receiving a random access response (RAR) message including a CSI-RS indication.

[0127] In the second aspect, either alone or in combination with the first aspect, the resource set corresponding to CSI-RS is explicitly scheduled via RAR messages.

[0128] In the third aspect, either alone or in combination with the first aspect, the resource set corresponding to CSI-RS is implicitly indicated at least in part based on at least one of the following: resources corresponding to RAR messages, resources corresponding to UE identification messages, rules defined in the wireless communication specification, or the values ​​of bit fields in RAR messages.

[0129] In the fourth aspect, either alone or in combination with one or more of the first to third aspects, the RAR message includes a CSI feedback indication that corresponds to one or more resources.

[0130] In the fifth aspect, either alone or in combination with one or more of the first to fourth aspects, the CSI feedback indication is used to indicate at least one of the following: the CSI to be included in the CSI feedback, or the parameter associated with the CSI feedback.

[0131] In the sixth aspect, CSI feedback is carried as uplink control information on the physical uplink shared channel.

[0132] In the seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the resource set corresponding to CSI-RS includes at least one of the following: time-domain resources or frequency-domain resources.

[0133] Although Figure 5 The example box for process 500 is shown, but in some aspects, it differs from... Figure 5 Compared to the boxes described herein, process 500 may include additional boxes, fewer boxes, different boxes, or boxes arranged differently. Alternatively, two or more boxes in process 500 may be executed in parallel.

[0134] Figure 6 This is a diagram illustrating, for example, an example process 600 performed by a base station according to various aspects of this disclosure. Example process 600 is an example of operations performed by a base station (e.g., base station 110) in connection with techniques for scheduling CSI-RS and feedback during RACH operation.

[0135] like Figure 6As shown, in some aspects, process 600 may include: sending a CSI-RS indication prior to the transmission of a UE identification message corresponding to a RACH operation, the CSI-RS indication indicating a resource set corresponding to a CSI-RS scheduled to be sent to the UE (block 610). For example, the base station may (e.g., using...) Figure 8 The transmission component 804 described herein sends a CSI-RS indication before transmitting the UE identification message corresponding to the RACH operation. The CSI-RS indication is used to indicate the resource set corresponding to the CSI-RS scheduled to be sent to the UE, as described above.

[0136] like Figure 6 As further shown, in some aspects, process 600 may include: receiving a UE identification message, wherein the UE identification message includes CSI feedback corresponding to CSI-RS (block 620). For example, the base station may (e.g., using...) Figure 8 The receiving component 802 described herein receives a UE identification message, wherein the UE identification message includes CSI feedback corresponding to CSI-RS, as described above.

[0137] Process 600 may include additional aspects, such as any single aspect or any combination thereof described below and / or in conjunction with one or more other aspects described elsewhere in this document.

[0138] In the first aspect, process 600 includes: sending a RAR message including a CSI-RS indication.

[0139] In the second aspect, either alone or in combination with the first aspect, the resource set corresponding to CSI-RS is explicitly scheduled via RAR messages.

[0140] In the third aspect, either alone or in combination with the first aspect, the resource set corresponding to CSI-RS is implicitly indicated at least in part based on at least one of the following: resources corresponding to RAR messages, resources corresponding to UE identification messages, rules defined in the wireless communication specification, or the values ​​of bit fields in RAR messages.

[0141] In the fourth aspect, either alone or in combination with one or more of the first to third aspects, the RAR message includes a CSI feedback indication that corresponds to one or more resources.

[0142] In the fifth aspect, either alone or in combination with one or more of the first to fourth aspects, the CSI feedback indication is used to indicate at least one of the following: the CSI to be included in the CSI feedback, or the parameter associated with the CSI feedback.

[0143] In the sixth aspect, CSI feedback is carried as uplink control information on the physical uplink shared channel.

[0144] In the seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the resource set corresponding to CSI-RS includes at least one of the following: time-domain resources or frequency-domain resources.

[0145] Although Figure 6 An example box for process 600 is shown, but in some aspects, it differs from... Figure 6 Compared to the boxes described herein, process 600 may include additional boxes, fewer boxes, different boxes, or boxes arranged differently. Alternatively, two or more boxes in process 600 may be executed in parallel.

[0146] Figure 7 This is a block diagram of an example device 700 for wireless communication. Device 700 may be a UE, or a UE may include device 700. In some aspects, device 700 includes a receiving component 702 and a transmitting component 704, which can communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, device 700 can use the receiving component 702 and the transmitting component 704 to communicate with another device 706 (e.g., a UE, a base station, or another wireless communication device). As further shown, device 700 may include a communication manager 708, etc. The communication manager 708 can facilitate the determination of CSI-RS parameters and / or resources based on implicit indications of CSI-RS parameters and / or resources, CSI measurement, refined beam selection, etc.

[0147] In some respects, device 700 can be configured to perform the functions described herein. Figure 4 The one or more operations described herein. Alternatively or concurrently, the apparatus 700 may be configured to perform one or more processes described herein, such as... Figure 5 The process 500. In some aspects, the apparatus 700 and / or Figure 7 One or more components shown may include the above-mentioned components. Figure 2 One or more components of the described UE. Alternatively or alternatively, Figure 7 One or more components shown can be combined with the above. Figure 2 Implemented within one or more of the described components. Alternatively or additionally, one or more components in the set of components may be implemented at least partially as software stored in memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the function or operation of the component.

[0148] Receiver 702 may receive communications from device 706, such as reference signals, control information, data communications, or combinations thereof. Receiver 702 may provide the received communications to one or more other components of device 700. In some aspects, receiver 702 may perform signal processing on the received communications (e.g., filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding), and may provide the processed signal to one or more other components of device 706. In some aspects, receiver 702 may include the elements described above. Figure 2 The described UE includes one or more antennas, demodulators, MIMO detectors, receiver processors, controllers / processors, memory, or combinations thereof.

[0149] The transmission component 704 can send 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 can generate communications and provide the generated communications to the transmission component 704 for transmission to the device 706. In some aspects, the transmission component 704 can perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding) on ​​the generated communications and can send the processed signals to the device 706. In some aspects, the transmission component 704 can include the combinations described above. Figure 2 The described UE includes one or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memory, or combinations thereof. In some aspects, the transmit component 704 may be co-located with the receive component 702 in a transceiver.

[0150] The receiving component 702 can receive a CSI-RS indication, which indicates the resource set corresponding to a CSI-RS scheduled to be sent to the UE. After receiving the CSI-RS indication, the transmitting component 704 can send a UE identification message corresponding to the RACH operation, wherein the UE identification message includes CSI feedback corresponding to the CSI-RS. The receiving component 702 can receive a RAR message including the CSI-RS indication. The receiving component 702 can receive CSI-RS.

[0151] Figure 7 The number and arrangement of components shown are provided as an example. In practice, with... Figure 7 Compared to the components shown, there may be additional components, fewer components, different components, or components arranged differently. Furthermore, Figure 7 The two or more components shown can be implemented in a single component, or Figure 7The single component shown can be implemented as multiple distributed components. Alternatively, Figure 7 The component collection shown (e.g., one or more components) can perform actions described as being performed by Figure 7 The other set of components shown performs one or more functions.

[0152] Figure 8 This is a block diagram of an example device 800 for wireless communication. Device 800 may be a base station, or a base station may include device 800. In some aspects, device 800 includes a receiving component 802 and a transmitting component 804, which can communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, device 800 can use the receiving component 802 and the transmitting component 804 to communicate with another device 806 (e.g., a UE, a base station, or another wireless communication device). As further shown, device 800 may include a communication manager 808, which can facilitate one or more beamfinding operations based at least in part on CSI feedback received from the UE.

[0153] In some respects, device 800 can be configured to perform the functions described herein. Figure 4 The one or more operations described herein. Alternatively or concurrently, the device 800 may be configured to perform one or more processes described herein, such as... Figure 6 The process 600. In some aspects, the apparatus 800 and / or Figure 8 One or more components shown may include the above-mentioned components. Figure 2 One or more components of the described base station. Alternatively or alternatively, Figure 8 One or more components shown can be combined with the above. Figure 2 Implemented within one or more of the described components. Alternatively or additionally, one or more components in the set of components may be implemented at least partially as software stored in memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the function or operation of the component.

[0154] Receiver 802 may receive communications from device 806, such as reference signals, control information, data communications, or combinations thereof. Receiver 802 may provide the received communications to one or more other components of device 800. In some aspects, receiver 802 may perform signal processing on the received communications (e.g., filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding), and may provide the processed signal to the one or more other components of device 806. In some aspects, receiver 802 may include the elements described above.Figure 2 The described base station includes one or more antennas, demodulators, MIMO detectors, receiver processors, controllers / processors, memory, or combinations thereof.

[0155] The transmission component 804 can send communications, such as reference signals, control information, data communications, or combinations thereof, to the device 806. In some aspects, one or more other components of the device 806 can generate communications and provide the generated communications to the transmission component 804 for transmission to the device 806. In some aspects, the transmission component 804 can perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding) on ​​the generated communications and can send the processed signals to the device 806. In some aspects, the transmission component 804 can include the combinations described above. Figure 2 The described base station includes one or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memory, or combinations thereof. In some aspects, the transmit component 804 may be co-located with the receive component 802 in a transceiver.

[0156] The transmission component 804 may send a CSI-RS indication before transmitting the UE identification message corresponding to the RACH operation. The CSI-RS indication indicates the resource set corresponding to the CSI-RS scheduled to be sent to the UE. The receiving component 802 may receive the UE identification message, which includes CSI feedback corresponding to the CSI-RS. The transmission component 804 may send a RAR message including the CSI-RS indication. The transmission component 804 may also send the CSI-RS.

[0157] Figure 8 The number and arrangement of components shown are provided as an example. In practice, with... Figure 8 Compared to the components shown, there may be additional components, fewer components, different components, or components arranged differently. Furthermore, Figure 8 The two or more components shown can be implemented in a single component, or Figure 8 The single component shown can be implemented as multiple distributed components. Alternatively, Figure 8 The component collection shown (e.g., one or more components) can perform actions described as being performed by Figure 8 The other set of components shown performs one or more functions.

[0158] The above disclosure provides explanations and descriptions, but is not intended to be exhaustive or to limit the subject matter to the precise form disclosed. Modifications and variations may be made based on the above disclosure, or from various forms of practice.

[0159] As used herein, the term "component" is intended to be interpreted broadly as hardware, firmware, and / or a combination of hardware and software. As used herein, a processor is implemented using hardware, firmware, and / or a combination of hardware and software. It will be apparent that the systems and / or methods described herein can be implemented using various forms of hardware, firmware, and / or combinations of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods is not a limitation in any respect. Therefore, the operation and performance of the systems and / or methods are described without reference to specific software code, and it is to be understood that software and hardware can be designed to implement these systems and / or methods, at least in part, based on the descriptions herein.

[0160] As used in this article, depending on the context, satisfying the threshold can mean a value greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, etc.

[0161] Although specific combinations of features are set forth in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of the aspects. In fact, many of these features can be combined in ways not specifically set forth in the claims and / or not disclosed in the specification. While each dependent claim listed below may directly depend on only one claim, the disclosure of the aspects includes each dependent claim as well as every other claim in the claim set. The phrase “at least one of” in the list of items refers to any combination of these items (including a single member). For example, “at least one of a, b, or c” is intended to cover a, b, c, ab, ac, bc, and abc, as well as any combination having 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).

[0162] Elements, actions, or instructions used herein should not be construed as critical or fundamental unless explicitly stated otherwise. Furthermore, as used herein, the articles “a” and “an” are intended to include one or more items and may be used interchangeably with “one or more.” Furthermore, as used herein, the article “the” is intended to include one or more items referenced in conjunction with the article “the” and may be used interchangeably with “one or more.” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items (e.g., related items, irrelevant items, combinations of related and irrelevant items, etc.) and may be used interchangeably with “one or more.” In cases where only one item is intended, the phrase “only one” or similar terms are used. Furthermore, as used herein, the terms “have,” “possess,” “include,” etc., are intended to be open-ended terms. Furthermore, the phrase “based on” is intended to mean “at least partially based on” unless otherwise explicitly stated. Furthermore, as used herein, the term “and / or” is intended to be inclusive when used in a series and may be used interchangeably with “and / or” unless otherwise explicitly stated (e.g., if used in conjunction with “any” or “only one of”).

Claims

1. A method for wireless communication performed by a user equipment (UE), comprising: As the second message associated with the random access procedure, the Random Access Response (RAR) message is received. The RAR message includes: A Channel State Information (CSI) Reference Signal (CSI-RS) indication is provided, wherein the CSI-RS indication is used to indicate a set of resources corresponding to a CSI-RS scheduled to be sent to the UE prior to the transmission of the UE identification message, wherein the set of resources corresponding to the CSI-RS is implicitly indicated at least in part based on resources corresponding to the UE identification message, and CSI feedback indication, the CSI feedback indication being used to indicate one or more resources associated with the transmission of CSI feedback during a third message associated with the random access procedure; Receive the CSI-RS after receiving the RAR message; and After receiving the CSI-RS and as the third message associated with the random access procedure, the UE identification message is sent. The UE identification message includes the CSI feedback, and The CSI feedback corresponds to the CSI-RS.

2. The method according to claim 1, wherein, The resource set corresponding to the CSI-RS is also implicitly indicated, at least in part, based on rules defined in the wireless communication specification.

3. The method according to claim 1, wherein, The resource set corresponding to the CSI-RS is also implicitly indicated, at least in part, based on the resources corresponding to the RAR message.

4. The method according to claim 1, wherein, The resource set corresponding to the CSI-RS is also implicitly indicated, at least in part, based on the values ​​of the bit fields in the RAR message.

5. The method according to claim 1, wherein, The resource set corresponding to the CSI-RS includes at least one of the following: time-domain resources or frequency-domain resources.

6. The method according to claim 1, wherein, The CSI feedback indication is used to indicate at least one of the following: The CSI to be included in the CSI feedback, or Parameters associated with the CSI feedback.

7. The method according to claim 1, wherein, The CSI feedback is carried as uplink control information on the physical uplink shared channel.

8. The method according to claim 1, further comprising: The Physical Downlink Control Channel (PDCCH) receives and schedules the RAR messages.

9. The method according to claim 8, wherein, The PDCCH schedules the RAR messages in Physical Downlink Shared Channel (PDSCH) communication.

10. The method according to claim 9, wherein, The PDCCH includes resource allocation for the PDSCH communication.

11. A method for wireless communication performed by a network entity, comprising: As the second message associated with the random access procedure, a Random Access Response (RAR) message is sent. The RAR message includes: A Channel State Information (CSI) Reference Signal (CSI-RS) indication is provided, wherein the CSI-RS indication is used to indicate a set of resources corresponding to a CSI-RS scheduled to be sent to the User Equipment (UE) before the UE identification message corresponding to the random access procedure is sent by the User Equipment (UE), wherein the set of resources corresponding to the CSI-RS is implicitly indicated at least in part based on the resources corresponding to the UE identification message, and CSI feedback indication, the CSI feedback indication being used to indicate one or more resources associated with the transmission of CSI feedback during a third message associated with the random access procedure; Send the CSI-RS after sending the RAR message; and After sending the CSI-RS and as the third message associated with the random access procedure, the UE identification message is received. The UE identification message includes the CSI feedback corresponding to the CSI-RS.

12. The method according to claim 11, wherein, The resource set corresponding to the CSI-RS is also implicitly indicated, at least in part, based on rules defined in the wireless communication specification.

13. The method according to claim 11, wherein, The resource set corresponding to the CSI-RS is also implicitly indicated, at least in part, based on the resources corresponding to the RAR message.

14. The method according to claim 11, wherein, The resource set corresponding to the CSI-RS is also implicitly indicated, at least in part, based on the values ​​of the bit fields in the RAR message.

15. The method according to claim 11, wherein, The resource set corresponding to the CSI-RS includes at least one of the following: time-domain resources or frequency-domain resources.

16. The method according to claim 11, wherein, The CSI feedback indication is used to indicate at least one of the following: The CSI to be included in the CSI feedback, or Parameters associated with the CSI feedback.

17. The method according to claim 11, wherein, The CSI feedback is carried as uplink control information on the physical uplink shared channel.

18. The method of claim 11, further comprising: The Physical Downlink Control Channel (PDCCH) is used to send the RAR messages.

19. The method according to claim 18, wherein, The PDCCH schedules the RAR messages in Physical Downlink Shared Channel (PDSCH) communication.

20. The method according to claim 19, wherein, The PDCCH includes resource allocation for the PDSCH communication.

21. A user equipment (UE) for wireless communication, comprising: One or more memory units; as well as One or more processors coupled to the one or more memories, the one or more processors being configured to: As the second message associated with the random access procedure, the Random Access Response (RAR) message is received. The RAR message includes: A Channel State Information (CSI) Reference Signal (CSI-RS) indication is provided, wherein the CSI-RS indication is used to indicate a set of resources corresponding to a CSI-RS scheduled to be sent to the UE prior to the transmission of the UE identification message, wherein the set of resources corresponding to the CSI-RS is implicitly indicated at least in part based on resources corresponding to the UE identification message, and CSI feedback indication, the CSI feedback indication being used to indicate one or more resources associated with the transmission of CSI feedback during a third message associated with the random access procedure; Receive the CSI-RS after receiving the RAR message; and After receiving the CSI-RS and as the third message associated with the random access procedure, the UE identification message is sent. The UE identification message includes the CSI feedback, and The CSI feedback corresponds to the CSI-RS.

22. The UE according to claim 21, wherein, The resource set corresponding to the CSI-RS is also implicitly indicated, at least in part, based on rules defined in the wireless communication specification.

23. The UE according to claim 21, wherein, The resource set corresponding to the CSI-RS is also implicitly indicated, at least in part, based on the resources corresponding to the RAR message.

24. The UE according to claim 21, wherein, The resource set corresponding to the CSI-RS is also implicitly indicated, at least in part, based on the values ​​of the bit fields in the RAR message.

25. The UE according to claim 21, wherein, The resource set corresponding to the CSI-RS includes at least one of the following: time-domain resources or frequency-domain resources.

26. The UE according to claim 21, wherein, The CSI feedback indication is used to indicate at least one of the following: The CSI to be included in the CSI feedback, or Parameters associated with the CSI feedback.

27. The UE according to claim 21, wherein, The CSI feedback is carried as uplink control information on the physical uplink shared channel.

28. The UE according to claim 21, wherein, The one or more processors are further configured to: The Physical Downlink Control Channel (PDCCH) receives and schedules the RAR messages.

29. The UE according to claim 28, wherein, The PDCCH schedules the RAR messages in Physical Downlink Shared Channel (PDSCH) communication.

30. The UE according to claim 29, wherein, The PDCCH includes resource allocation for the PDSCH communication.

31. A network entity for wireless communication, comprising: One or more memory units; as well as One or more processors coupled to the one or more memories, the one or more processors being configured to: As the second message associated with the random access procedure, a Random Access Response (RAR) message is sent. The RAR message includes: A Channel State Information (CSI) Reference Signal (CSI-RS) indication is provided, wherein the CSI-RS indication is used to indicate a set of resources corresponding to a CSI-RS scheduled to be sent to the User Equipment (UE) before the UE identification message corresponding to the random access procedure is sent by the User Equipment (UE), wherein the set of resources corresponding to the CSI-RS is implicitly indicated at least in part based on the resources corresponding to the UE identification message, and CSI feedback indication, the CSI feedback indication being used to indicate one or more resources associated with the transmission of CSI feedback during a third message associated with the random access procedure; Send the CSI-RS after sending the RAR message; and After sending the CSI-RS and as the third message associated with the random access procedure, the UE identification message is received. The UE identification message includes the CSI feedback corresponding to the CSI-RS.

32. The network entity according to claim 31, wherein, The resource set corresponding to the CSI-RS is also implicitly indicated, at least in part, based on rules defined in the wireless communication specification.

33. The network entity according to claim 31, wherein, The resource set corresponding to the CSI-RS is also implicitly indicated, at least in part, based on the resources corresponding to the RAR message.

34. The network entity according to claim 31, wherein, The resource set corresponding to the CSI-RS is also implicitly indicated, at least in part, based on the values ​​of the bit fields in the RAR message.

35. The network entity according to claim 31, wherein, The resource set corresponding to the CSI-RS includes at least one of the following: time-domain resources or frequency-domain resources.

36. The network entity according to claim 31, wherein, The CSI feedback indication is used to indicate at least one of the following: The CSI to be included in the CSI feedback, or Parameters associated with the CSI feedback.

37. The network entity according to claim 31, wherein, The CSI feedback is carried as uplink control information on the physical uplink shared channel.

38. The network entity according to claim 31, wherein, The one or more processors are further configured to: The Physical Downlink Control Channel (PDCCH) is used to send the RAR messages.

39. The network entity according to claim 38, wherein, The PDCCH schedules the RAR messages in Physical Downlink Shared Channel (PDSCH) communication.

40. The network entity according to claim 39, wherein, The PDCCH includes resource allocation for the PDSCH communication.

41. 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 user equipment (UE), cause the UE to perform the following operations: As the second message associated with the random access procedure, the Random Access Response (RAR) message is received. The RAR message includes: A Channel State Information (CSI) Reference Signal (CSI-RS) indication is provided, wherein the CSI-RS indication is used to indicate a set of resources corresponding to a CSI-RS scheduled to be sent to the UE prior to the transmission of the UE identification message, wherein the set of resources corresponding to the CSI-RS is implicitly indicated at least in part based on resources corresponding to the UE identification message, and CSI feedback indication, the CSI feedback indication being used to indicate one or more resources associated with the transmission of CSI feedback during a third message associated with the random access procedure; Receive the CSI-RS after receiving the RAR message; and After receiving the CSI-RS and as the third message associated with the random access procedure, the UE identification message is sent. The UE identification message includes the CSI feedback, and The CSI feedback corresponds to the CSI-RS.

42. The non-transitory computer-readable medium according to claim 41, wherein, The resource set corresponding to the CSI-RS is also implicitly indicated, at least in part, based on rules defined in the wireless communication specification.

43. The non-transitory computer-readable medium according to claim 41, wherein, The resource set corresponding to the CSI-RS is also implicitly indicated, at least in part, based on the resources corresponding to the RAR message.

44. The non-transitory computer-readable medium according to claim 41, wherein, The resource set corresponding to the CSI-RS is also implicitly indicated, at least in part, based on the values ​​of the bit fields in the RAR message.

45. The non-transitory computer-readable medium according to claim 41, wherein, The resource set corresponding to the CSI-RS includes at least one of the following: time-domain resources or frequency-domain resources.

46. ​​The non-transitory computer-readable medium according to claim 41, wherein, The CSI feedback indication is used to indicate at least one of the following: The CSI to be included in the CSI feedback, or Parameters associated with the CSI feedback.

47. The non-transitory computer-readable medium according to claim 41, wherein, The CSI feedback is carried as uplink control information on the physical uplink shared channel.

48. The non-transitory computer-readable medium according to claim 41, wherein, The one or more instructions also cause the UE to perform the following operations: The Physical Downlink Control Channel (PDCCH) receives and schedules the RAR messages.

49. The non-transitory computer-readable medium according to claim 48, wherein, The PDCCH schedules the RAR messages in Physical Downlink Shared Channel (PDSCH) communication, and the PDCCH includes resource allocation for the PDSCH communication.

50. A non-transitory computer-readable medium storing a set of instructions for wireless communication, the instruction set comprising: One or more instructions, which, when executed by one or more processors of the network entity, cause the network entity to perform the following operations: As the second message associated with the random access procedure, a Random Access Response (RAR) message is sent. The RAR message includes: A Channel State Information (CSI) Reference Signal (CSI-RS) indication is provided, wherein the CSI-RS indication is used to indicate a set of resources corresponding to a CSI-RS scheduled to be sent to the User Equipment (UE) before the UE identification message corresponding to the random access procedure is sent by the User Equipment (UE), wherein the set of resources corresponding to the CSI-RS is implicitly indicated at least in part based on the resources corresponding to the UE identification message, and CSI feedback indication, the CSI feedback indication being used to indicate one or more resources associated with the transmission of CSI feedback during a third message associated with the random access procedure; Send the CSI-RS after sending the RAR message; and After sending the CSI-RS and as the third message associated with the random access procedure, the UE identification message is received. The UE identification message includes the CSI feedback corresponding to the CSI-RS.

51. The non-transitory computer-readable medium according to claim 50, wherein, The resource set corresponding to the CSI-RS is also implicitly indicated, at least in part, based on rules defined in the wireless communication specification.

52. The non-transitory computer-readable medium according to claim 50, wherein, The resource set corresponding to the CSI-RS is also implicitly indicated, at least in part, based on the resources corresponding to the RAR message.

53. The non-transitory computer-readable medium according to claim 50, wherein, The resource set corresponding to the CSI-RS is also implicitly indicated, at least in part, based on the values ​​of the bit fields in the RAR message.

54. The non-transitory computer-readable medium according to claim 50, wherein, The resource set corresponding to the CSI-RS includes at least one of the following: time-domain resources or frequency-domain resources.

55. The non-transitory computer-readable medium according to claim 50, wherein, The CSI feedback indication is used to indicate at least one of the following: The CSI to be included in the CSI feedback, or Parameters associated with the CSI feedback.

56. The non-transitory computer-readable medium according to claim 50, wherein, The CSI feedback is carried as uplink control information on the physical uplink shared channel.

57. The non-transitory computer-readable medium according to claim 50, wherein, The one or more instructions also cause the network entity to perform the following operations: The Physical Downlink Control Channel (PDCCH) is used to send the RAR messages.

58. The non-transitory computer-readable medium according to claim 57, wherein, The PDCCH schedules the RAR messages in Physical Downlink Shared Channel (PDSCH) communication, and the PDCCH includes resource allocation for the PDSCH communication.

59. An apparatus for wireless communication at a user equipment (UE), comprising: The unit used to receive the Random Access Response (RAR) message as a second message associated with the random access procedure. The RAR message includes: A Channel State Information (CSI) Reference Signal (CSI-RS) indication is provided, wherein the CSI-RS indication is used to indicate a set of resources corresponding to a CSI-RS scheduled to be sent to the UE prior to the transmission of the UE identification message, wherein the set of resources corresponding to the CSI-RS is implicitly indicated at least in part based on resources corresponding to the UE identification message, and CSI feedback indication, the CSI feedback indication being used to indicate one or more resources associated with the transmission of CSI feedback during a third message associated with the random access procedure; A unit for receiving the CSI-RS after receiving the RAR message; and A unit for sending the UE identification message after receiving the CSI-RS and as the third message associated with the random access procedure. The UE identification message includes the CSI feedback, and The CSI feedback corresponds to the CSI-RS.

60. The apparatus of claim 59, further comprising a unit for performing the steps of the method of any one of claims 2-10.

61. An apparatus for wireless communication at a network entity, comprising: The unit used to send the Random Access Response (RAR) message as a second message associated with the random access procedure. The RAR message includes: A Channel State Information (CSI) Reference Signal (CSI-RS) indication is provided, wherein the CSI-RS indication is used to indicate a set of resources corresponding to a CSI-RS scheduled to be sent to the User Equipment (UE) before the UE identification message corresponding to the random access procedure is sent by the User Equipment (UE), wherein the set of resources corresponding to the CSI-RS is implicitly indicated at least in part based on the resources corresponding to the UE identification message, and CSI feedback indication, the CSI feedback indication being used to indicate one or more resources associated with the transmission of CSI feedback during a third message associated with the random access procedure; A unit for sending the CSI-RS after sending the RAR message; and A unit for receiving the UE identification message after the CSI-RS is sent and as a third message associated with the random access procedure. The UE identification message includes the CSI feedback corresponding to the CSI-RS.

62. The apparatus of claim 61, further comprising a unit for performing the steps of the method of any one of claims 12-20.

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