Method and apparatus for random access response to two-step random access procedure

Abstract

Various aspects of the present disclosure generally relate to wireless communications. A user equipment (UE) may transmit a random access message including a preamble and a payload. A base station may detect the preamble of the random access message. The base station may fail to decode or successfully decode the payload of the random access message. The base station may transmit a random access response based at least in part on the detection of the preamble and different decoding results for the payload. The random access response may include an uplink group grant for multiple UEs whose preamble transmissions share the same time and frequency opportunity and an indication of the type of the uplink group grant. The UE may monitor the type and content of the uplink group grant and then transmit data on a shared set of time-frequency resources. Numerous other aspects are provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to U.S. Provisional Patent Application No. 62 / 859,604, filed on June 10, 2019, entitled “DESIGN CONSIDERATIONS FOR RANDOM ACCESS RESPONSE FOR A TWO-STEP RANDOM ACCESS PROCEDURE,” and U.S. Non-Provisional Patent Application No. 16 / 892,670, filed on June 4, 2020, entitled “DESIGN CONSIDERATIONS FOR A RANDOM ACCESS RESPONSE FORA TWO-STEP RANDOM ACCESS PROCEDURE,” which are hereby expressly incorporated herein by reference.

[0003] Public domain

[0004] Aspects of the present disclosure relate generally to wireless communications and to techniques and apparatus for random access responses for a two-step random access procedure. Background Art

[0005] Wireless communication systems are widely deployed to provide various 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).

[0006] A wireless communication network may include several base stations (BS) that can support communication of 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, a gNB, an Access Point (AP), a Radio Head, a Transmit Receive Point (TRP), a New Radio (NR) BS, a 5G Node B, and the like.

[0007] The above multiple access technologies have been adopted in various telecommunication standards to provide common protocols that enable different user equipment to communicate at city, country, region, and even global levels. New Radio (NR) (which may also be referred to as 5G) is an enhancement set to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to better 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), using CP-OFDM and / or SC-FDM (e.g., also referred to as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), and supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation to better integrate with other open standards. However, as the demand for mobile broadband access continues to grow, there is a need for further improvements in LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access technologies and telecommunication standards that employ these technologies.

[0008] Overview

[0009] In some aspects, a wireless communication method performed by a user equipment (UE) may include: transmitting a preamble and a payload of a random access message associated with a two-step random access procedure; receiving a random access response associated with the two-step random access procedure, the random access response including an uplink group grant for multiple UEs including the UE and an indication of a type of the uplink group grant; and transmitting uplink communications on a shared set of time-frequency resources based at least in part on the uplink group grant.

[0010] In some aspects, a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: transmit a preamble and a payload of a random access message associated with a two-step random access procedure; receive a random access response associated with the two-step random access procedure, the random access response including an uplink group grant for a plurality of UEs including the UE and an indication of a type of the uplink group grant; and transmit uplink communications on a shared set of time-frequency resources based at least in part on the uplink group grant.

[0011] 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 preamble and a payload of a random access message associated with a two-step random access procedure; receive a random access response associated with the two-step random access procedure, the random access response including an uplink group grant for a plurality of UEs including the UE and an indication of a type of the uplink group grant; and transmit uplink communications on a shared set of time-frequency resources based at least in part on the uplink group grant.

[0012] In some aspects, a device for wireless communications may include: a device for transmitting a preamble and a payload of a random access message associated with a two-step random access procedure; a device for receiving a random access response associated with the two-step random access procedure, the random access response including an uplink group grant for multiple devices including the device and an indication of a type of the uplink group grant; and a device for transmitting uplink communications on a shared set of time-frequency resources based at least in part on the uplink group grant.

[0013] In some aspects, a wireless communication method performed by a base station may include: detecting a preamble of a random access message associated with a two-step random access procedure, wherein the random access message is received from a user equipment (UE); processing a payload of the random access message, wherein a result of processing the payload is successfully decoding the payload or failing to decode the payload; and transmitting a random access response associated with the two-step random access procedure based at least in part on detecting the preamble and a result of processing the payload, wherein the random access response includes an uplink group grant for multiple UEs including the UE and an indication of a type of the uplink group grant, wherein the preamble transmissions of the multiple UEs share time and frequency opportunities.

[0014] In some aspects, a base station for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: detect a preamble of a random access message associated with a two-step random access procedure, wherein the random access message is received from a user equipment (UE); process a payload of the random access message, wherein a result of processing the payload is a successful decoding of the payload or a failure to decode the payload; and transmit a random access response associated with the two-step random access procedure based at least in part on the detection of the preamble and the result of processing the payload, wherein the random access response includes an uplink group grant for a plurality of UEs including the UE and an indication of a type of the uplink group grant, wherein the preamble transmissions of the plurality of UEs share time and frequency opportunities.

[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 base station, may cause the one or more processors to: detect a preamble of a random access message associated with a two-step random access procedure, wherein the random access message is received from a user equipment (UE); process a payload of the random access message, wherein a result of processing the payload is a successful decoding of the payload or a failure to decode the payload; and transmit a random access response associated with the two-step random access procedure based at least in part on the detection of the preamble and the result of processing the payload, wherein the random access response includes an uplink group grant for a plurality of UEs including the UE and an indication of a type of the uplink group grant, wherein the preamble transmissions of the plurality of UEs share time and frequency opportunities.

[0016] In some aspects, an apparatus for wireless communications may include: a device for detecting a preamble of a random access message associated with a two-step random access procedure, wherein the random access message is received from a user equipment (UE); a device for processing a payload of the random access message, wherein a result of processing the payload is a successful decoding of the payload or a failure to decode the payload; and a device for transmitting a random access response associated with the two-step random access procedure based at least in part on detecting the preamble and a result of processing the payload, wherein the random access response includes an uplink group grant for multiple UEs including the UE and an indication of a type of the uplink group grant, wherein preamble transmissions of the multiple UEs share time and frequency opportunities.

[0017] In some aspects, a wireless communication method performed by a base station may include: constructing an uplink group grant for multiple UEs performing a two-step random access procedure, wherein a preamble or payload of a random access message provided by the multiple UEs has been detected by the base station; and transmitting a random access response associated with the two-step random access procedure, wherein the random access response includes the uplink group grant and an indication of the type of the uplink group grant.

[0018] In some aspects, a wireless communication method performed by a UE may include: transmitting a preamble and a payload of a random access message associated with a two-step random access procedure; and receiving a random access response associated with the two-step random access procedure after transmitting the preamble and the payload of the random access message, wherein the random access response includes an uplink group grant for multiple UEs including the UE, and wherein the random access response includes an indication of a type of the uplink group grant.

[0019] In some aspects, a base station for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: construct an uplink group grant for a plurality of UEs performing a two-step random access procedure, wherein a preamble or a payload of a random access message provided by the plurality of UEs has been detected by the base station; and transmit a random access response associated with the two-step random access procedure, wherein the random access response includes the uplink group grant and an indication of a type of the uplink group grant.

[0020] In some aspects, a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: transmit a preamble and a payload of a random access message associated with a two-step random access procedure; and receive a random access response associated with the two-step random access procedure after transmitting the preamble and the payload of the random access message, wherein the random access response includes an uplink group grant for a plurality of UEs including the UE, and wherein the random access response includes an indication of a type of the uplink group grant.

[0021] 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 base station, may cause the one or more processors to: construct an uplink group grant for multiple UEs performing a two-step random access procedure, wherein a preamble or payload of a random access message provided by the multiple UEs has been detected by the base station; and transmit a random access response associated with the two-step random access procedure, wherein the random access response includes the uplink group grant and an indication of the type of the uplink group grant. 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 the UE, may cause the one or more processors to: transmit a preamble and a payload of a random access message associated with a two-step random access procedure; and receive a random access response associated with the two-step random access procedure after transmitting the preamble and the payload of the random access message, wherein the random access response includes an uplink group grant for multiple UEs including the UE, and wherein the random access response includes an indication of a type of the uplink group grant.

[0022] In some aspects, an apparatus for wireless communications may include: a device for constructing an uplink group grant for multiple UEs performing a two-step random access procedure, wherein a preamble or payload of a random access message provided by the multiple UEs has been detected by the base station; and a device for transmitting a random access response associated with the two-step random access procedure, wherein the random access response includes the uplink group grant and an indication of the type of the uplink group grant.

[0023] In some aspects, an apparatus for wireless communications may include: a device for transmitting a preamble and a payload of a random access message associated with a two-step random access procedure; and a device for receiving a random access response associated with the two-step random access procedure after transmitting the preamble and the payload of the random access message, wherein the random access response includes an uplink group grant for multiple UEs including the apparatus, and wherein the random access response includes an indication of a type of the uplink group grant.

[0024] Aspects generally include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and processing systems as substantially described herein with reference to and as illustrated in the accompanying drawings and specification.

[0025] The foregoing has broadly outlined the features and technical advantages of examples according to the present disclosure in an effort to make the following detailed description better understood. Additional features and advantages will be described hereinafter. The disclosed concepts and specific examples can be easily used as a basis for modifying or designing other structures for implementing the same purpose as the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both in terms of their organization and method of operation, and the associated advantages will be better understood by considering the following description in conjunction with the accompanying drawings. Each of the accompanying drawings is provided for the purpose of illustration and description and is not intended to define limitations on the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to understand the above-stated features of the present disclosure in detail, the above briefly summarized content may be described in more detail with reference to various aspects, some of which are illustrated 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 to limit its scope, as the description may allow for other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0028] Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0029] Figure 2 is a block diagram conceptually illustrating an example of a base station and a UE in communication in a wireless communication network according to various aspects of the present disclosure.

[0030] Figures 3A-3C is a diagram illustrating an example associated with a random access response for a two-step random access procedure according to various aspects of the present disclosure.

[0031] Figure 4 is a diagram illustrating example processes performed, for example, by a base station in accordance with various aspects of the present disclosure.

[0032] Figure 5 is a diagram illustrating example processes performed, for example, by a UE according to various aspects of the present disclosure.

[0033] Figure 6 is a diagram illustrating example processes performed, for example, by a base station in accordance with various aspects of the present disclosure.

[0034] Figure 7 is a diagram illustrating example processes performed, for example, by a UE according to various aspects of the present disclosure.

[0035] Detailed Description

[0036] 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 it will fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art will appreciate that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is implemented independently or 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 as 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.

[0037] 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.

[0038] It should be noted 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.

[0039] 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 BSs 110a, BSs 110b, BSs 110c, and BSs 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, B node, gNB, 5G B node (NB), access point, transmit receive point (TRP), and the like. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" may refer to a coverage area of ​​a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0040] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by 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. The BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "B node", "5G NB", and "cell" may be used interchangeably herein.

[0041] 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, and / or the like using any suitable transport network.

[0042] The wireless network 100 may also include a relay station. A relay station is an entity that can receive transmissions of data from an upstream station (e.g., a BS or a UE) and send transmissions of the data 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 , a relay station 110d may communicate with a macro BS 110a and a UE 120d to facilitate communication between the BS 110a and the UE 120d. A relay station may also be referred to as a relay BS, a relay base station, a relay, or the like.

[0043] 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).

[0044] A network controller 130 may be coupled to a set of BSs and may provide coordination and control of these BSs. The network controller 130 may communicate with each BS via a backhaul. The BSs may also communicate with each other directly or indirectly, for example, via a wireless or wired backhaul.

[0045] 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. A UE may be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biometric sensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0046] Some UEs may be considered as machine type communication (MTC) UEs, 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 provide connectivity to or to a network (e.g., a wide area network (such as the Internet) or a cellular network), for example, 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 client equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120, such as a processor component, a memory component, and the like.

[0047] In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a specific RAT and may operate on one or more frequencies. RAT may also be referred to as radio technology, air interface, etc. Frequency may also be referred to as carrier, frequency channel, etc. Each frequency may 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 may be deployed.

[0048] 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 sidelink 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.

[0049] As indicated above, Figure 1 are provided as examples. Other examples may differ from those described in Figure 1 Examples described.

[0050] Figure 2 A block diagram of a design 200 of a base station 110 and a UE 120 is shown, which may be Figure 1 One for each base station and one for each UE in the base station 110. 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.

[0051] 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 the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the 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), etc.) and control information (e.g., CQI requests, grants, upper layer signaling, 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.

[0052] 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 UE 120 may be included in a housing.

[0053] 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 as well as 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 sent by the UE 120. The receive processor 238 may provide decoded data to a data sink 239 and provide decoded control information to a 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.

[0054] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other component(s) of the base station 110 may perform one or more techniques for random access response for a two-step random access procedure, as described in more detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the 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 operations of process 500, and / or other processes as described herein. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. Scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0055] In some aspects, the base station 110 may include: means for detecting a preamble of a random access message associated with a two-step random access procedure, wherein the random access message is received from the UE 120; means for processing a payload of the random access message, wherein a result of processing the payload is a successful decoding of the payload or a failure to decode the payload; and means for transmitting a random access response associated with the two-step random access procedure based at least in part on the detection of the preamble and the result of processing the payload, wherein the random access response includes an uplink group grant for a plurality of UEs including the UE 120 and an indication of a type of the uplink group grant, wherein the preamble transmissions of the plurality of UEs share time and frequency opportunities; and so on. In some aspects, such means may include in conjunction with Figure 2 One or more components of base station 110 are described.

[0056] In some aspects, the base station 110 may include: means for constructing an uplink group grant for a plurality of UEs 120 performing a two-step random access procedure, wherein a preamble or a payload of a random access message provided by the plurality of UEs 120 has been detected by the base station; and means for transmitting a random access response associated with the two-step random access procedure, wherein the random access response includes the uplink group grant and an indication of a type of the uplink group grant; etc. In some aspects, such means may include in conjunction with Figure 2 One or more components of base station 110 are described.

[0057] In some aspects, UE 120 may include: means for transmitting a preamble and a payload of a random access message associated with a two-step random access procedure; means for receiving a random access response associated with the two-step random access procedure, the random access response including an uplink group grant for a plurality of UEs including UE 120 and an indication of a type of the uplink group grant; and means for transmitting uplink communications on a shared set of time-frequency resources based at least in part on the uplink group grant; etc. In some aspects, such means may include in conjunction with Figure 2 One or more components of UE 120 are described.

[0058] In some aspects, UE 120 may include: means for transmitting a preamble and a payload of a random access message associated with a two-step random access procedure; means for receiving a random access response associated with the two-step random access procedure after transmitting the preamble and the payload of the random access message, wherein the random access response includes an uplink group grant for a plurality of UEs including the UE, and wherein the random access response includes an indication of a type of the uplink group grant; etc. In some aspects, such means may include in conjunction with Figure 2 One or more components of UE 120 are described.

[0059] As indicated above, Figure 2 are provided as examples. Other examples may differ from those described in Figure 2 Examples described.

[0060] The two-step random access channel (RACH) procedure includes two steps (rather than four steps as in the conventional four-step RACH procedure). In the two-step RACH procedure, the UE transmits a random access message (referred to as msgA) including a (e.g., randomly selected) preamble and a payload (e.g., a physical uplink shared channel (PUSCH) payload). In an ideal case, the base station successfully detects the preamble and successfully decodes the payload, and transmits a random access response (referred to as msgB) to the UE. The random access response includes a physical downlink control channel (PDCCH) communication and a physical downlink shared channel (PDSCH) payload, wherein the PDCCH communication identifies the resources in the PDSCH payload that carry information for the UE. The PDSCH payload may, for example, include: contention resolution information for the UE, a cell radio network temporary identifier (C-RNTI) for the UE, a timing advance (TA) command for the UE, and the like. In this ideal case (ie, when the base station detects the msgA preamble and decodes the msgA payload), a random access response associated with the two-step RACH procedure is referred to herein as a successful random access response (successful RAR).

[0061] However, in some cases, the base station may not detect the preamble of the random access message and / or may fail to decode the payload of the random access message. Such a scenario may occur due to, for example, channel impairment, contention-based multi-access, etc. Thus, in order to improve the reliability of the two-step RACH procedure, fallback to transmission of another random access message (e.g., a message similar to msg3 in the conventional four-step RACH procedure) and / or retransmission of the random access message (e.g., retransmission of msgA) may be supported.

[0062] In the case where the base station successfully detects the preamble of the random access message but fails to decode the payload of the random access message, the base station may send a random access response including the following items: a random access preamble identifier (RAPID) associated with the detected preamble, an uplink grant for the UE, a TA command for the UE, and a temporary C-RNTI (TC-RNTI) for the UE. The random access response associated with the two-step RACH procedure in the case where the preamble is detected but the payload is not successfully decoded is referred to as a fallback random access response (fallback RAR) in this article. Generally, when a UE performing a two-step RACH procedure receives a fallback random access response, the UE falls back to a four-step RACH procedure and transmits another random access message (e.g., msg3) based on the receipt of the fallback random access response. Here, the content of the other random access message may be similar or different from the content of the payload of the random access message transmitted by the UE during the two-step RACH attempt. It is worth noting that the UE does not need to transmit the preamble together with the other random access message because the base station has already detected the preamble. In the event that the base station does not detect a preamble of a random access message, the base station may send a backoff indication in a random access response media access control (MAC) subheader (eg, to enable the UE to retransmit the random access message at a later time).

[0063] As indicated above, in a conventional two-step RACH procedure, the base station includes an uplink grant for the UE (e.g., a single UE uplink grant) in a given fallback random access response, but does not include any uplink grant in a successful random access response. Such an uplink grant design for two-step RACH may result in inefficiencies, for example, in terms of spectral efficiency, power consumption, and signaling overhead.

[0064] Some aspects described herein provide improvements in uplink grant design for two-step RACH procedures. For example, in some aspects, the uplink grant included in the fallback random access response can be an uplink group grant for multiple UEs (e.g., to allow the multiple UEs to share uplink resources for further uplink transmission). As another example, in some aspects, an uplink grant can be included in a successful random access response (e.g., to allow the UE to send additional uplink data without requesting uplink resources). Here, the uplink grant can be a single UE grant, or it can be an uplink group grant for multiple UEs. As another example, the uplink group grant can be used by a UE for which different random access message processing results are obtained (e.g., a UE for which the decoding of the payload of msgA fails and a second UE for which the decoding of the payload of msgA succeeds, where the second UE needs to transmit additional uplink data). As described below, the uplink grant design aspects described herein provide higher spectral efficiency and reduce power consumption while reducing signaling overhead.

[0065] Figures 3A-3C is a diagram illustrating an example associated with a random access response for a two-step random access procedure according to various aspects of the present disclosure. Figures 3A-3C For purposes of the examples shown in , a UE (eg, UE 120) is configured to use a two-step RACH procedure associated with connecting to a base station (eg, base station 110).

[0066] Figure 3A is a diagram of an example 300 in which the uplink grant included in the fallback random access response is an uplink group grant associated with a plurality of UEs including the UE. Figure 3A As shown by reference numerals 302 and 304, the UE may transmit a preamble (msgA preamble) of a random access message associated with a two-step RACH procedure and a payload (msgA payload) of a random access message associated with a two-step RACH procedure.

[0067] The base station detects the preamble of the random access message, as indicated by reference numeral 306. However, as indicated by reference numeral 308, the base station fails to decode the payload of the random access message.

[0068] As indicated by reference numeral 310, based at least in part on detecting the preamble and failing to decode the payload, the base station may transmit a random access response associated with a two-step random access procedure, the random access response including an uplink group grant for a plurality of UEs including the UE. In other words, the base station may transmit msgB with a fallback random access response, the fallback random access response including the uplink group grant. In some aspects, the fallback random access response may include a set of K (K≥1) RAPIDs, each RAPID being associated with a respective one of the K UEs for which the preamble was detected but the payload was not successfully decoded.

[0069] An uplink group grant is an uplink grant for multiple UEs, which means that the multiple UEs may share resources associated with additional uplink transmissions in the uplink grant. In some aspects, the uplink group grant may indicate a resource set and a modulation and coding scheme (MCS) to be used by the multiple UEs to transmit other random access messages (e.g., a resource set and MCS to be used by these UEs to transmit msg3).

[0070] In some aspects, a demodulation reference signal (DMRS) resource configuration (e.g., port and / or sequence) for multiple UEs may be explicitly indicated in an uplink group grant. Alternatively, the DMRS resource configuration for multiple UEs may be implicitly indicated by a mapping rule associated with a preamble resource index and a DMRS resource index configured by a base station for the multiple UEs (e.g., a mapping rule between a preamble resource index and a DMRS resource index, wherein the preamble resource index may include both a RACH opportunity (RO) and a sequence, and the DMRS resource index may include both an antenna port and a sequence).

[0071] In some aspects, the base station may transmit a timing advance (TA) command associated with a UE and a temporary cell radio network temporary identifier (TC-RNTI) associated with the UE separately from an uplink group grant (e.g., so that each of the multiple UEs can receive a corresponding TA command and TC-RNTI).

[0072] In some aspects, the uplink group grant may be the only uplink group grant included in the random access response. In other words, in some cases, the random access response transmitted by the base station may include a single uplink group grant for multiple UEs.

[0073] Alternatively, in some aspects, the random access response may include multiple uplink group grants. For example, the uplink group grant may be a first uplink group grant, and the multiple UEs may be the first multiple UEs for which the preamble is detected but the payload is not successfully decoded. In this example, the random access response may further include a second uplink group grant associated with a second multiple UE (e.g., a separate uplink group grant for another multiple UEs for which the preamble is detected but the payload is not successfully decoded). In some aspects, the base station may divide the group of UEs into a first multiple UE and a second multiple UE based at least in part on, for example, the proximity of the timing offset associated with a group of UEs or the UE state associated with the group of UEs (e.g., derived from rules for msgA preambles, RO selection, etc.).

[0074] In some aspects, the random access response may further include a single UE uplink grant for another UE. For example, the random access response may include an uplink group grant for multiple UEs and may further include a single UE grant for another UE (e.g., a UE not included in the multiple UEs).

[0075] As in Figure 3A As further shown in FIG. 1 by reference numeral 312, the UE may receive a random access response including an uplink group grant for a plurality of UEs, and may transmit an uplink communication (e.g., msg3) based at least in part on the uplink group grant. Here, the UE may individually adjust the timing offset (e.g., based on a TA command associated with the UE) and individually scramble the PUSCH bits, but may use the resource set and MCS indicated by the uplink group grant (i.e., the same resource set and the same MCS used by other UEs in the plurality of UEs).

[0076] Here, the use of uplink group grants improves spectral efficiency, since multiple UEs can use the same resource set and MCS in association with transmitting uplink communications during a two-step RACH procedure. In addition, by using uplink group grants (rather than multiple single UE grants), power consumption is reduced at the base station and signaling overhead is reduced.

[0077] Figure 3B is a diagram of an example 320 in which an uplink grant is included in a successful random access response. Figure 3BAs indicated by reference numerals 322 and 324 in the figure, the UE may transmit a preamble (msgA preamble) of a random access message associated with a two-step RACH procedure and a payload (msgA payload) of the random access message associated with the two-step RACH procedure. As indicated by reference numeral 324, the payload of the random access message may include an indication that the UE needs to transmit additional uplink data (e.g., the UE has uplink data ready for transmission in addition to the uplink data included in the payload). In some aspects, the indication may be in the form of a buffer status report (BSR) included in the payload of the random access message, a scheduling request (SR) included in the payload of the random access message, etc.

[0078] As indicated by reference numeral 326, the base station detects a preamble of the random access message. As indicated by reference numeral 328, the base station decodes a payload of the random access message. As further indicated by reference numeral 328, the base station may determine that the UE needs to transmit additional uplink data. In some aspects, the base station may determine that the UE needs to transmit additional uplink data based at least in part on an indication in the payload of the random access message.

[0079] Based at least in part on determining that the UE needs to transmit additional uplink data, the base station may transmit a random access response associated with a two-step random access procedure, the random access response including an uplink grant for the UE, as indicated by reference numeral 330. In other words, the base station may transmit a successful random access response including an uplink grant.

[0080] In some aspects, the uplink grant may be a single UE uplink grant for the UE (e.g., an uplink grant specific to the UE). In such a case, in some aspects, the random access response may further include an uplink group grant for multiple UEs other than the UE (e.g., for multiple other UEs whose payload decoding is successful, each of which needs to transmit additional uplink data).

[0081] In some aspects, the uplink grant may be an uplink group grant for multiple UEs including the UE (e.g., for multiple UEs whose payload decoding is successful, each of which needs to transmit additional uplink data). In some aspects, the grouping of the multiple UEs may be based at least in part on reference signal received power (RSRP) measurements, channel state information (CS1) reports, beam management, quality of service (Q0S) handling, positioning-related measurements, and the like. In other words, in some aspects, the base station may group the UEs to be associated with a given uplink group grant based at least in part on one or more measurements and / or characteristics determined from the payload of a random access message transmitted by each of the UEs. The information carried and / or indicated by the uplink group grant is similar to that described above in conjunction with Figure 3A In some aspects, the uplink group grant may be the only uplink group grant included in the random access response, or may be one of a plurality of uplink group grants included in the random access response. In addition, in some aspects, in the case where the uplink grant is an uplink group grant, the random access response may further include a single UE uplink grant for another UE.

[0082] As in Figure 3B As further shown by reference numeral 332 in the figure, the UE may receive a random access response including an uplink grant for the UE, and may transmit uplink communications (e.g., including additional uplink data) based at least in part on the uplink grant. Here, if the uplink grant is an uplink group grant, the UE may individually adjust the timing offset (e.g., based on a TA command associated with the UE) and scramble the PUSCH bits, but may use the resource set and MCS indicated by the uplink group grant (i.e., the same resource set and the same MCS used by other UEs in the plurality of UEs).

[0083] Here, the use of uplink grants in a successful random access response can improve spectral efficiency, since multiple UEs can use the same set of resources and MCS associated with transmitting uplink communications. In addition, by providing an uplink grant in a successful random access response (rather than waiting for the UE to provide an explicit request for uplink resources), power consumption is reduced at the UE and base station and signaling overhead is reduced.

[0084] Figure 3C is a diagram of Example 340, wherein the uplink grant included in the fallback random access response is an uplink group grant associated with multiple UEs, including UEs for which decoding of the payload of the random access message failed and UEs for which decoding of the payload of the random access message succeeded.

[0085] In some aspects, a base station may identify multiple UEs associated with a two-step random access procedure to which an uplink group grant will be transmitted, wherein the multiple UEs include a first UE for which decoding of a payload of a first random access message fails and a second UE for which decoding of a payload of a second random access message succeeds.

[0086] For example, as shown by reference numerals 342 and 344, a first UE (UE1) may transmit a preamble of a first random access message and a payload of the first random access message. As shown by reference numeral 346, the base station detects the preamble of the first random access message. However, as shown by reference numeral 348, the base station fails to decode the payload of the first random access message. In addition, as shown by reference numerals 350 and 352, a second UE (UE2) may transmit a preamble of a second random access message and a payload of the second random access message. As shown by reference numeral 354, the base station detects the preamble of the second random access message, and as shown by reference numeral 356, successfully decodes the payload of the second random access message. In this example, the base station has identified a plurality of UEs associated with a two-step random access procedure to which an uplink group grant will be transmitted, wherein the plurality of UEs include a first UE (e.g., UE1 for which decoding of the payload of the first random access message fails) and a second UE (e.g., UE2 for which decoding of the payload of the second random access message succeeds).

[0087] As indicated by reference numeral 358, based at least in part on identifying the multiple UEs, the base station may transmit a random access response associated with a two-step random access procedure, the random access response including an uplink group grant for multiple UEs including a first UE and a second UE. It is noteworthy that in this case, the uplink group grant will be shared by multiple UEs with different msgA processing results. In other words, the uplink group grant may be shared by a first UE for which payload decoding fails (e.g., to transmit msg3) and a second UE for which payload decoding succeeds (e.g., to transmit additional uplink communications). Here, a single uplink group grant is required, rather than separate uplink grants required in a fallback random access response and a successful random access response.

[0088] In some aspects, the base station may transmit and the plurality of UEs may receive a random access response in a resource set separate from resources corresponding to a fallback random access response and resources corresponding to a successful random access response. Alternatively, in some aspects, the base station may transmit and the plurality of UEs may receive an uplink group grant in a resource set shared by a fallback random access response and a successful random access response.

[0089] In some aspects, the information carried and / or indicated by the uplink group grant may be similar to the information in the above combination. Figure 3A In some aspects, the uplink group grant may be the only uplink group grant included in the random access response, or may be one of a plurality of uplink group grants included in the random access response. In addition, in some aspects, the random access response may further include a single UE uplink grant for another UE.

[0090] Similar to the above, the first UE and the second UE may receive a random access response including an uplink group grant and may transmit respective uplink communications (eg, including msg3 and additional uplink data, respectively) based at least in part on the uplink group grant.

[0091] Here, the use of uplink group grants improves spectral efficiency, since multiple UEs can use the same set of resources and MCS in association with transmitting uplink communications during a two-step RACH procedure. In addition, by using uplink group grants (rather than multiple single UE grants), power consumption is reduced at the base station and signaling overhead is reduced. In addition, by providing an uplink group grant in a random access response to a UE for which a payload is successfully decoded (rather than waiting for the UE to provide an explicit request for uplink resources), power consumption is reduced at the UE and base station and signaling overhead is reduced.

[0092] As indicated in the above examples, the base station may construct one or more uplink group grants for two-step RACH UEs whose preambles or payloads have been detected. In some aspects, the status of the uplink group grants included in the random access response (e.g., msgB) may include information identifying the number of group grants, information identifying the type of group grants, an indication of the type of group grants, etc. In some aspects, the indication of the type of group grant may be based at least in part on a bitmap.

[0093] In some aspects, the random access response may include a random access response PDCCH (eg, msgB PDCCH) and a random access response PDSCH (eg, msgB PDSCH) (including DMRS).

[0094] In some aspects, the random access response PDCCH may include downlink control information (DCI) with a cyclic redundancy check (CRC) attached. In some aspects, the CRC may be masked using a group RNTI (such as RA-RNTI). In some aspects, the random access response PDCCH may be configured in a common search space that will be monitored by a group of two-step RACH UEs that share the same RACH opportunity for transmission of a random access message (e.g., msgA). In some aspects, the DCI may carry resource assignments for the random access response PDSCH. In some aspects, the DCI may carry an early indication of the type of uplink group grant, such as an uplink group grant in a fallback RAR (Fal1backRAR), an uplink group grant in a successful RAR (SuccessRAR), a shared uplink group grant, etc.

[0095] In some aspects, the random access response PDSCH may include a MAC packet data unit (PDU). In some aspects, the MAC PDU may carry at least a fallback RAR and a success RAR, wherein the uplink group grant may be included in the fallback RAR, the success RAR, or one or more other fields of the MAC PDU. In some aspects, the uplink group grant field may include at least a common time-frequency resource allocation for subsequent uplink transmissions (e.g., PUSCH transmissions). In some aspects, the uplink group grant field also includes MCS, PUSCH hopping flags, DMRS resource configurations, and / or common information for power control and beam management.

[0096] As indicated above, Figures 3A-3C are provided as examples. Other examples may differ from those described in Figures 3A-3C Examples described.

[0097] Figure 4 is a diagram illustrating an example process 400, performed, for example, by a base station, in accordance with various aspects of the present disclosure. Example process 400 is an example of operations in which a base station (eg, base station 110, etc.) performs random access responses for a two-step RACH procedure.

[0098] like Figure 4 As shown in , in some aspects, process 400 may include detecting a preamble of a random access message associated with a two-step random access procedure (block 410). For example, the base station (e.g., using the receive processor 238, the controller / processor 240, the memory 242, etc.) may detect a preamble of a random access message associated with a two-step random access procedure, as described above. In some aspects, the random access message is received from a UE (e.g., UE 120).

[0099] As in Figure 4As further shown in FIG. 4 , in some aspects, process 400 may include processing a payload of the random access message, wherein the processing of the payload results in successfully decoding the payload or failing to decode the payload (block 420). For example, the base station (e.g., using receive processor 238, controller / processor 240, memory 242, etc.) may process the payload of the random access message as described above. In some aspects, the processing of the payload results in successfully decoding the payload or failing to decode the payload.

[0100] As in Figure 4 As further shown in , in some aspects, process 400 may include transmitting a random access response associated with the two-step random access procedure based at least in part on the results of detecting the preamble and processing the payload, wherein the random access response includes an uplink group grant for multiple UEs including the UE and an indication of the type of the uplink group grant (block 430). For example, the base station (e.g., using the transmit processor 220, the receive processor 238, the controller / processor 240, the memory 242, etc.) may transmit a random access response associated with the two-step random access procedure based at least in part on the results of detecting the preamble and processing the payload, as described above. In some aspects, the random access response includes an uplink group grant for multiple UEs including the UE and an indication of the type of the uplink group grant. In some aspects, the preamble transmissions of the multiple UEs share time and frequency opportunities.

[0101] Process 400 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0102] In a first aspect, when a result of processing the payload of the random access message is a failure to decode the payload, the uplink group grant is included in the random access response based at least in part on a failure to decode the payload.

[0103] In a second aspect, alone or in combination with the first aspect, the uplink group grant is included in a fallback random access response.

[0104] In a third aspect, alone or in combination with one or more of the first and second aspects, the UE is included in the multiple UEs based at least in part on a timing offset associated with the UE or a UE state of the UE. For example, a group of UEs may be divided into two or more groups of multiple UEs including the multiple UEs based at least in part on proximity of timing offsets associated with the group of UEs or UE states associated with the group of UEs.

[0105] In a fourth aspect, either alone or in combination with one or more of the first to third aspects, the uplink group grant indicates a common set of time-frequency resources, a modulation and coding scheme (MCS), common information for power control or beam management, and a physical uplink shared channel (PUSCH) hopping flag to be used by the multiple UEs to transmit other random access messages.

[0106] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, a demodulation reference signal (DMRS) resource configuration for the plurality of UEs is explicitly indicated in the uplink group grant.

[0107] In the sixth aspect, alone or in combination with one or more of the first to fifth aspects, the demodulation reference signal (DMRS) resource configuration for the multiple UEs is implicitly indicated by a mapping rule associated with a preamble resource index and a DMRS resource index configured by the base station for the multiple UEs.

[0108] In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, a timing advance (TA) command associated with the UE, and a temporary cellular cell radio network temporary identifier (TC-RNTI) associated with the UE are transmitted separately from the uplink group grant.

[0109] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, the uplink group grant is the only uplink group grant included in the random access response.

[0110] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the uplink group grant is one of a plurality of uplink group grants included in the random access response.

[0111] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the random access response further includes a single UE uplink grant to another UE.

[0112] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the result of processing the payload of the random access message is successfully decoding the payload. Here, the base station may determine that the UE needs to transmit additional uplink data based at least in part on an indication in the payload.

[0113] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the uplink group grant is included in a successful random access response.

[0114] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the indication is provided via a buffer status report (BSR).

[0115] In a fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, the indication is provided via a scheduling request (SR).

[0116] In the fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, the UE is grouped into the multiple UEs based at least in part on at least one of the following: reference signal received power (RSRP) measurement, channel state information (CS1) reporting, beam management, quality of service (QoS) handling, or positioning-related measurements.

[0117] In a sixteenth aspect, either alone or in combination with one or more of the first to fifteenth aspects, the uplink group grant is transmitted in resources independent of resources corresponding to a fallback random access response and resources corresponding to a successful random access response.

[0118] In a seventeenth aspect, alone or in combination with one or more of the first to sixteenth aspects, the uplink group grant is transmitted in a resource set shared by the fallback random access response and the successful random access response.

[0119] In an eighteenth aspect, either alone or in combination with one or more of the first to seventeenth aspects, an indication of the type of grant for the uplink group is transmitted in a downlink control information (DCI) field of a random access response physical downlink control channel (PDCCH).

[0120] In a nineteenth aspect, either alone or in combination with one or more of the first to eighteenth aspects, the indication of the type of uplink group grant is based at least in part on a bitmap.

[0121] In a twentieth aspect, alone or in combination with one or more of the first to nineteenth aspects, the DCI is associated with a cyclic redundancy check (CRC). Here, the CRC may be masked by a group radio network temporary identifier (RNTI).

[0122] In a twenty-first aspect, alone or in combination with one or more of the first to twentieth aspects, the random access response PDCCH is transmitted in a common search space.

[0123] although Figure 4 An example block diagram of process 400 is shown, but in some aspects, process 400 may include Figure 4Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 400. Additionally or alternatively, two or more blocks of the process 400 may be executed in parallel.

[0124] Figure 5 is a diagram illustrating an example process 500, performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process 500 is an example of operations in which a UE (eg, UE 120, etc.) performs random access responses for a two-step RACH procedure.

[0125] like Figure 5 As shown in , in some aspects, process 500 may include transmitting a preamble and a payload of a random access message associated with a two-step random access procedure (block 510). For example, the UE (e.g., using the transmit processor 264, the controller / processor 280, the memory 282, etc.) may transmit a preamble and a payload of a random access message associated with a two-step random access procedure, as described above.

[0126] As in Figure 5 As further shown in FIG. 5 , in some aspects, process 500 may include receiving a random access response associated with the two-step random access procedure, the random access response including an uplink group grant for a plurality of UEs including the UE and an indication of a type of the uplink group grant (block 520). For example, the UE (e.g., using receive processor 258, controller / processor 280, memory 282, etc.) may receive a random access response associated with the two-step random access procedure, the random access response including an uplink group grant for a plurality of UEs including the UE and an indication of a type of the uplink group grant, as described above.

[0127] As in Figure 5 As further shown in FIG. 5 , in some aspects, process 500 may include transmitting uplink communications on the shared set of time-frequency resources based at least in part on the uplink group grant (block 530). For example, the UE (e.g., using transmit processor 264, controller / processor 280, memory 282, etc.) may transmit uplink communications on the shared set of time-frequency resources based at least in part on the uplink group grant, as described above.

[0128] Process 500 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0129] In a first aspect, the uplink group grant is included in the random access response based at least in part on a base station failing to decode the payload.

[0130] In a second aspect, alone or in combination with the first aspect, the uplink group grant is included in a fallback random access response.

[0131] In a third aspect, alone or in combination with one or more of the first and second aspects, the UE is included in the plurality of UEs based at least in part on a timing offset associated with the UE or a UE state of the UE.

[0132] In a fourth aspect, either alone or in combination with one or more of the first to third aspects, the uplink group grant indicates a common set of time-frequency resources, a modulation and coding scheme (MCS), common information for power control or beam management, and a physical uplink shared channel (PUSCH) hopping flag to be used by the multiple UEs to transmit other random access messages.

[0133] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, a demodulation reference signal (DMRS) resource configuration for the plurality of UEs is explicitly indicated in the uplink group grant.

[0134] In the sixth aspect, alone or in combination with one or more of the first to fifth aspects, the demodulation reference signal (DMRS) resource configuration for the multiple UEs is implicitly indicated by a mapping rule associated with a preamble resource index and a DMRS resource index configured by the base station for the multiple UEs.

[0135] In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, a timing advance (TA) command associated with the UE, and a temporary cellular cell radio network temporary identifier (TC-RNTI) associated with the UE are received separately from the uplink group grant.

[0136] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, the uplink group grant is the only uplink group grant included in the random access response.

[0137] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the uplink group grant is one of a plurality of uplink group grants included in the random access response.

[0138] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the random access response further includes a single UE uplink grant to another UE.

[0139] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, an indication that the UE needs to transmit additional uplink data is included in the payload.

[0140] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the uplink group grant is included in a successful random access response.

[0141] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the indication is provided via a buffer status report (BSR).

[0142] In a fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, the indication is provided via a scheduling request (SR).

[0143] In the fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, the UE is grouped into the multiple UEs based at least in part on at least one of the following: reference signal received power (RSRP) measurement, channel state information (CS1) reporting, beam management, quality of service (QoS) handling, or positioning-related measurements.

[0144] In a sixteenth aspect, either alone or in combination with one or more of the first to fifteenth aspects, the uplink group grant is received in resources independent of resources corresponding to a fallback random access response and resources corresponding to a successful random access response.

[0145] In a seventeenth aspect, alone or in combination with one or more of the first to sixteenth aspects, the uplink group grant is received in a resource set shared by a fallback random access response and a successful random access response.

[0146] In an eighteenth aspect, either alone or in combination with one or more of the first to seventeenth aspects, an indication of the type of grant to the uplink group is received in a downlink control information (DCI) field of a random access response physical downlink control channel (PDCCH) based at least in part on monitoring the random access response PDCCH.

[0147] In a nineteenth aspect, alone or in combination with one or more of the first to eighteenth aspects, the DCI is associated with a cyclic redundancy check (CRC). Here, the CRC may be demasked using a group radio network temporary identifier (RNTI).

[0148] In a twentieth aspect, alone or in combination with one or more of the first to nineteenth aspects, the DCI is decoded to determine a resource assignment for a random access response physical downlink shared channel (PDSCH). Here, an indication of the type of uplink group grant may be carried in the random access response PDSCH.

[0149] In a twenty-first aspect, alone or in combination with one or more of the first to twentieth aspects, the random access response and the uplink group grant are decoded.

[0150] In the twenty-second aspect, alone or in combination with one or more of the first to twenty-first aspects, timing advance (TA), modulation and coding scheme (MCS), power control, beam management and time-frequency resource allocation are applied in association with transmitting the uplink communication.

[0151] although Figure 5 An example block diagram of process 500 is shown, but in some aspects, process 500 may include Figure 5 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 500. Additionally or alternatively, two or more blocks of the process 500 may be executed in parallel.

[0152] Figure 6 is a diagram illustrating an example process 600, performed, for example, by a base station, in accordance with various aspects of the present disclosure. Example process 600 is an example of operations in which a base station (eg, base station 110, etc.) performs design considerations for a random access response for a two-step random access procedure.

[0153] like Figure 6 As shown in , in some aspects, process 600 may include constructing an uplink group grant for a plurality of UEs performing a two-step random access procedure, wherein a preamble or a payload of a random access message provided by the plurality of UEs has been detected by the base station (block 610). For example, the base station (e.g., using transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may construct an uplink group grant for a plurality of UEs (e.g., UE 120) performing a two-step random access procedure, as described above. In some aspects, a preamble or a payload of a random access message provided by the plurality of UEs has been detected by the base station.

[0154] As in Figure 6 As further shown in FIG. 6 , in some aspects, process 600 may include transmitting a random access response associated with the two-step random access procedure, wherein the random access response includes the uplink group grant and an indication of a type of the uplink group grant (block 620). For example, the base station (e.g., using transmit processor 220, controller / processor 240, memory 242, etc.) may transmit a random access response associated with the two-step random access procedure, as described above. In some aspects, the random access response includes the uplink group grant and an indication of a type of the uplink group grant.

[0155] Process 600 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0156] In a first aspect, the random access response includes a status of the uplink group grant, the status including at least one of: information identifying a number of uplink group grants included in the random access response, or an indication of a type of the uplink group grant.

[0157] In a second aspect, either alone or in combination with the first aspect, the indication of the type of the uplink group grant is transmitted in a DCI field of a random access response PDCCH.

[0158] In a third aspect, alone or in combination with one or more of the first and second aspects, the indication of the type of the uplink group grant is based at least in part on a bitmap.

[0159] In a fourth aspect, alone or in combination with one or more of the first to third aspects, wherein the DCI is associated with a CRC, wherein the CRC is masked by the group RNTI.

[0160] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the random access response PDCCH is transmitted in a common search space.

[0161] although Figure 6 An example block diagram of process 600 is 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 process 600. Additionally or alternatively, two or more blocks of process 600 may be executed in parallel.

[0162] Figure 7 is a diagram illustrating an example process 700, performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process 700 is an example of operations in which a UE (eg, UE 120, etc.) performs design considerations for a random access response for a two-step random access procedure.

[0163] like Figure 7 As shown in , in some aspects, process 700 may include transmitting a preamble and a payload of a random access message associated with a two-step random access procedure (block 710). For example, the UE (e.g., using the transmit processor 264, the controller / processor 280, the memory 282, etc.) may transmit a preamble and a payload of a random access message associated with a two-step random access procedure, as described above.

[0164] As in Figure 7As further shown in , in some aspects, process 700 may include receiving a random access response associated with a two-step random access procedure after transmitting a preamble and a payload of the random access message, wherein the random access response includes an uplink group grant for a plurality of UEs including the UE, and wherein the random access response includes an indication of a type of the uplink group grant (block 720). For example, the UE (e.g., using the receive processor 258, the controller / processor 280, the memory 282, etc.) may receive a random access response associated with a two-step random access procedure after transmitting a preamble and a payload of the random access message, as described above. In some aspects, the random access response includes an uplink group grant for a plurality of UEs including the UE, and wherein the random access response includes an indication of a type of the uplink group grant.

[0165] Process 700 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0166] In a first aspect, the random access response includes a status of the uplink group grant, the status including at least one of: information identifying a number of uplink group grants included in the random access response, or an indication of a type of the uplink group grant.

[0167] In a second aspect, alone or in combination with the first aspect, the indication of the type of the uplink group grant is received in a DCI field of a random access response PDCCH.

[0168] In a third aspect, alone or in combination with one or more of the first and second aspects, the indication of the type of the uplink group grant is based at least in part on a bitmap.

[0169] In a fourth aspect, alone or in combination with one or more of the first to third aspects, wherein the DCI is associated with a CRC, wherein the CRC is masked by the group RNTI.

[0170] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the random access response PDCCH is received in a common search space.

[0171] although Figure 7 An example block diagram of process 700 is shown, but in some aspects, process 700 may include Figure 7 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 700. Additionally or alternatively, two or more blocks of the process 700 may be executed in parallel.

[0172] 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 by practice of the various aspects.

[0173] 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.

[0174] As used herein, satisfying a threshold may refer to a value being greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0175] It will be apparent that the systems and / or methods described herein can be implemented in different 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. Thus, the operation and behavior of these systems and / or methods are described herein without reference to specific software codes-it is understood that software and hardware can be designed to implement these systems and / or methods based at least in part on the description herein.

[0176] 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 various 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 various aspects includes that each dependent claim is combined with each other claim in this group of claims. The phrase quoting "at least one of" a column of items 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 (for example, aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other sorting of a, b and c).

[0177] 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 "a" 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 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 used. Moreover, as used herein, the terms "having", "containing", "including", etc. 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 wireless communication method performed by a network entity, comprising: detecting a preamble of a random access message associated with a two-step random access procedure, wherein the random access message is received from a user equipment UE; Processing a payload of the random access message, wherein a result of processing the payload is successfully decoding the payload or failing to decode the payload; as well as transmitting a random access response associated with the two-step random access procedure based at least in part on detecting the preamble and the result of processing the payload, wherein the random access response comprises an uplink group grant for a plurality of UEs including the UE and an indication of a type of the uplink group grant, wherein the indication of the type of the uplink group grant can indicate that the uplink group grant is included in at least one of: a fallback random access response, a successful random access response, and a shared uplink group grant, and The preamble transmissions of the multiple UEs share time and frequency opportunities.

2. The method of claim 1 , wherein when the result of processing the payload of the random access message is a failure to decode the payload, the uplink group grant is included in the random access response based at least in part on a failure to decode the payload.

3. The method of claim 2, wherein the uplink group grant is included in a fallback random access response.

4. The method of claim 2, wherein the UE is included in the plurality of UEs based at least in part on a timing offset associated with the UE or a UE state of the UE.

5. The method as claimed in claim 1, wherein the uplink group grant indicates a common time-frequency resource set, a modulation and coding scheme MCS, common information for power control or beam management, and a physical uplink shared channel PUSCH hopping flag to be used by the multiple UEs to transmit other random access messages. 6 . The method of claim 1 , wherein a demodulation reference signal (DMRS) resource configuration for the plurality of UEs is explicitly indicated in the uplink group grant.

7. The method of claim 1, wherein the demodulation reference signal (DMRS) resource configuration for the multiple UEs is implicitly indicated by a mapping rule associated with a preamble resource index and a DMRS resource index configured by the network entity for the multiple UEs.

8. The method of claim 1, wherein a timing advance (TA) command associated with the UE and a temporary cell radio network temporary identifier (TC-RNTI) associated with the UE are transmitted separately from the uplink group grant.

9. The method of claim 1, wherein the uplink group grant is the only uplink group grant included in the random access response.

10. The method of claim 1, wherein the uplink group grant is one of a plurality of uplink group grants included in the random access response.

11. The method of claim 1, wherein the random access response further comprises a single UE uplink grant to another UE.

12. The method of claim 1, wherein the result of processing the payload of the random access message is successfully decoding the payload, wherein the method further comprises: determining, based at least in part on the indication in the payload, that the UE needs to transmit additional uplink data, Wherein the uplink group grant is included in the random access response based at least in part on the indication.

13. The method of claim 12, wherein the uplink group grant is included in a successful random access response.

14. The method of claim 12, wherein the indication is provided via a buffer status report (BSR).

15. The method of claim 12, wherein the indication is provided via a scheduling request (SR).

16. The method of claim 12, wherein the UE is grouped into the plurality of UEs based at least in part on at least one of: Reference signal received power RSRP measurement, Channel state information CSI report, Beam management, Quality of Service (QoS) treatment, or Positioning related measurements.

17. The method of claim 1, wherein the uplink group grant is transmitted in resources independent of resources corresponding to a fallback random access response and resources corresponding to a successful random access response.

18. The method of claim 1, wherein the uplink group grant is transmitted in a resource set shared by a fallback random access response and a successful random access response.

19. The method of claim 1, wherein the indication of the type of the uplink group grant is transmitted in a downlink control information (DCI) field of a random access response (Physical Downlink Control Channel) (PDCCH).

20. The method of claim 19, wherein the indication of the type of the uplink group grant is based at least in part on a bitmap.

21. The method of claim 19, wherein the DCI is associated with a cyclic redundancy check (CRC), wherein the CRC is masked by a group radio network temporary identifier (RNTI).

22. The method of claim 19, wherein the random access response PDCCH is transmitted in a common search space.

23. The method of claim 1, further comprising: The uplink group grant for performing a two-step random access procedure for the plurality of UEs is constructed.

24. The method of claim 1, wherein the random access response comprises a status of the uplink group grant, the status comprising at least one of: information identifying the number of uplink group grants included in the random access response, or The indication of the type of grant granted to the uplink group.

25. A wireless communication method performed by a user equipment UE, comprising: transmitting a preamble and a payload of a random access message associated with a two-step random access procedure; receiving a random access response associated with the two-step random access procedure, the random access response comprising an uplink group grant for a plurality of UEs including the UE and an indication of a type of the uplink group grant, wherein the indication of the type of the uplink group grant can indicate that the uplink group grant is included in at least one of: a fallback random access response, a success random access response, and a shared uplink group grant; and Uplink communications are transmitted on a shared set of time-frequency resources based at least in part on the uplink group grant.

26. The method of claim 25, wherein the uplink group grant included in the random access response indicates that a network entity failed to decode the payload.

27. The method of claim 26, wherein the uplink group grant is included in a fallback random access response.

28. The method of claim 26, wherein the UE is included in the plurality of UEs based at least in part on a timing offset associated with the UE or a UE state of the UE.

29. The method of claim 25, wherein the uplink group grant indicates a common set of time-frequency resources to be used by the multiple UEs to transmit other random access messages, a modulation and coding scheme MCS, common information for power control or beam management, and a physical uplink shared channel PUSCH hopping flag.

30. The method of claim 25, wherein the demodulation reference signal (DMRS) resource configuration for the plurality of UEs is explicitly indicated in the uplink group grant.

31. The method of claim 25, wherein the demodulation reference signal (DMRS) resource configuration for the plurality of UEs is implicitly indicated by a mapping rule associated with a preamble resource index and a DMRS resource index configured for the plurality of UEs by a network entity.

32. The method of claim 25, wherein a timing advance (TA) command associated with the UE and a temporary cell radio network temporary identifier (TC-RNTI) associated with the UE are received separately from the uplink group grant.

33. The method of claim 25, wherein the uplink group grant is the only uplink group grant included in the random access response.

34. The method of claim 25, wherein the uplink group grant is one of a plurality of uplink group grants included in the random access response.

35. The method of claim 25, wherein the random access response further comprises a single UE uplink grant to another UE.

36. The method of claim 25, wherein an indication that the UE needs to transmit additional uplink data is included in the payload of the random access message.

37. The method of claim 36, wherein the uplink group grant is included in a successful random access response.

38. The method of claim 36, wherein the indication is provided via a buffer status report (BSR).

39. The method of claim 36, wherein the indication is provided via a scheduling request (SR).

40. The method of claim 36, wherein the UE is grouped into the plurality of UEs based at least in part on at least one of: Reference signal received power RSRP measurement, Channel state information CSI report, Beam management, Quality of Service (QoS) treatment, or Positioning related measurements.

41. The method of claim 25, wherein the uplink group grant is received in resources separate from resources corresponding to a fallback random access response and resources corresponding to a successful random access response.

42. The method of claim 25, wherein the uplink group grant is received in a resource set shared by a fallback random access response and a successful random access response.

43. The method of claim 25, wherein the indication of the type of the uplink group grant is received in a downlink control information (DCI) field of a random access response physical downlink control channel (PDCCH) based at least in part on monitoring the random access response PDCCH.

44. The method of claim 43, wherein the DCI is associated with a cyclic redundancy check, CRC, wherein the CRC is demasked using a group radio network temporary identifier, RNTI.

45. The method of claim 43, wherein the DCI is decoded to determine a resource assignment for a random access response physical downlink shared channel (PDSCH), wherein the indication of the type of uplink group grant is carried in the random access response PDSCH.

46. ​​The method of claim 25, wherein the random access response and the uplink group grant are decoded.

47. The method of claim 25, wherein timing advance TA, modulation and coding scheme MCS, power control, beam management, and time-frequency resource allocation are applied in association with transmitting the uplink communication.

48. The method of claim 25, wherein the random access response comprises a status of the uplink group grant, the status comprising at least one of: information identifying the number of uplink group grants included in the random access response, or The indication of the type of grant granted to the uplink group.

49. A network entity for wireless communication, comprising: Memory; as well as one or more processors coupled to the memory, the one or more processors configured to: detecting a preamble of a random access message associated with a two-step random access procedure, wherein the random access message is received from a user equipment UE; Processing a payload of the random access message, wherein a result of processing the payload is successfully decoding the payload or failing to decode the payload; as well as transmitting a random access response associated with the two-step random access procedure based at least in part on detecting the preamble and the result of processing the payload, wherein the random access response comprises an uplink group grant for a plurality of UEs including the UE and an indication of a type of the uplink group grant, wherein the indication of the type of the uplink group grant can indicate that the uplink group grant is included in at least one of: a fallback random access response, a successful random access response, and a shared uplink group grant, and The preamble transmissions of the multiple UEs share time and frequency opportunities.

50. The network entity of claim 49, wherein when the result of processing the payload of the random access message is a failure to decode the payload, the uplink group grant is included in the random access response based at least in part on a failure to decode the payload.

51. The network entity of claim 50, wherein the uplink group grant is included in a fallback random access response.

52. The network entity of claim 50, wherein the UE is included in the plurality of UEs based at least in part on a timing offset associated with the UE or a UE state of the UE.

53. A network entity as described in claim 49, wherein the uplink group grant indicates a common set of time-frequency resources, a modulation and coding scheme MCS, common information for power control or beam management, and a physical uplink shared channel PUSCH hopping flag to be used by the multiple UEs to transmit other random access messages.

54. The network entity of claim 49, wherein a demodulation reference signal (DMRS) resource configuration for the plurality of UEs is explicitly indicated in the uplink group grant.

55. The network entity of claim 49, wherein the demodulation reference signal (DMRS) resource configuration for the plurality of UEs is implicitly indicated by a mapping rule associated with a preamble resource index and a DMRS resource index configured by the network entity for the plurality of UEs.

56. The network entity of claim 49, wherein a timing advance (TA) command associated with the UE and a temporary cell radio network temporary identifier (TC-RNTI) associated with the UE are transmitted separately from the uplink group grant.

57. The network entity of claim 49, wherein the uplink group grant is the only uplink group grant included in the random access response.

58. The network entity of claim 49, wherein the uplink group grant is one of a plurality of uplink group grants included in the random access response.

59. The network entity of claim 49, wherein the random access response further comprises a single UE uplink grant to another UE.

60. The network entity of claim 49, wherein the result of processing the payload of the random access message is successfully decoding the payload, wherein the network entity further comprises: determining, based at least in part on the indication in the payload, that the UE needs to transmit additional uplink data, Wherein the uplink group grant is included in the random access response based at least in part on the indication.

61. The network entity of claim 60, wherein the uplink group grant is included in a successful random access response.

62. The network entity of claim 60, wherein the indication is provided via a buffer status report (BSR).

63. The network entity of claim 60, wherein the indication is provided via a scheduling request (SR).

64. The network entity of claim 60, wherein the UE is grouped into the plurality of UEs based at least in part on at least one of: Reference signal received power RSRP measurement, Channel state information CSI report, Beam management, Quality of Service (QoS) treatment, or Positioning related measurements.

65. The network entity of claim 49, wherein the uplink group grant is transmitted in resources separate from resources corresponding to a fallback random access response and resources corresponding to a successful random access response.

66. The network entity of claim 49, wherein the uplink group grant is transmitted in a set of resources shared by a fallback random access response and a successful random access response.

67. The network entity of claim 49, wherein the indication of the type of the uplink group grant is transmitted in a downlink control information (DCI) field of a random access response (Physical Downlink Control Channel) (PDCCH).

68. The network entity of claim 67, wherein the indication of the type of the uplink group grant is based at least in part on a bitmap.

69. The network entity of claim 67, wherein the DCI is associated with a cyclic redundancy check (CRC), wherein the CRC is masked by a group radio network temporary identifier (RNTI).

70. The network entity of claim 67, wherein the random access response PDCCH is transmitted in a common search space.

71. The network entity of claim 49, further comprising: The uplink group grant for performing a two-step random access procedure for the plurality of UEs is constructed.

72. The network entity of claim 49, wherein the random access response comprises a status of the uplink group grant, the status comprising at least one of: information identifying the number of uplink group grants included in the random access response, or The indication of the type of grant granted to the uplink group.

73. 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 a preamble and a payload of a random access message associated with a two-step random access procedure; receiving a random access response associated with the two-step random access procedure, the random access response comprising an uplink group grant for a plurality of UEs including the UE and an indication of a type of the uplink group grant, wherein the indication of the type of the uplink group grant can indicate that the uplink group grant is included in at least one of: a fallback random access response, a success random access response, and a shared uplink group grant; and Uplink communications are transmitted on a shared set of time-frequency resources based at least in part on the uplink group grant.

74. The UE of claim 73, wherein the uplink group grant included in the random access response indicates that a network entity failed to decode the payload.

75. The UE of claim 74, wherein the uplink group grant is included in a fallback random access response.

76. The UE of claim 74, wherein the UE is included in the plurality of UEs based at least in part on a timing offset associated with the UE or a UE state of the UE.

77. A UE as described in claim 73, wherein the uplink group grant indicates a shared set of time-frequency resources, a modulation and coding scheme MCS, common information for power control or beam management, and a physical uplink shared channel PUSCH hopping flag to be used by the multiple UEs to transmit other random access messages.

78. The UE of claim 73, wherein the demodulation reference signal (DMRS) resource configuration for the plurality of UEs is explicitly indicated in the uplink group grant.

79. The UE of claim 73, wherein the demodulation reference signal (DMRS) resource configuration for the multiple UEs is implicitly indicated by a mapping rule associated with a preamble resource index and a DMRS resource index configured for the multiple UEs by a network entity.

80. The UE of claim 73, wherein a timing advance (TA) command associated with the UE and a temporary cell radio network temporary identifier (TC-RNTI) associated with the UE are received separately from the uplink group grant.

81. The UE of claim 73, wherein the uplink group grant is the only uplink group grant included in the random access response.

82. The UE of claim 73, wherein the uplink group grant is one of a plurality of uplink group grants included in the random access response.

83. The UE of claim 73, wherein the random access response further comprises a single UE uplink grant to another UE.

84. The UE of claim 73, wherein an indication that the UE needs to transmit additional uplink data is included in the payload of the random access message.

85. The UE of claim 84, wherein the uplink group grant is included in a successful random access response.

86. The UE of claim 84, wherein the indication is provided via a buffer status report (BSR).

87. The UE of claim 84, wherein the indication is provided via a scheduling request (SR).

88. The UE of claim 84, wherein the UE is grouped into the plurality of UEs based at least in part on at least one of: Reference signal received power RSRP measurement, Channel state information CSI report, Beam management, Quality of Service (QoS) treatment, or Positioning related measurements.

89. The UE of claim 73, wherein the uplink group grant is received in resources independent of resources corresponding to a fallback random access response and resources corresponding to a successful random access response.

90. The UE of claim 73, wherein the uplink group grant is received in a resource set shared by a fallback random access response and a successful random access response.

91. The UE of claim 73, wherein the indication of the type of uplink group grant is received in a downlink control information (DCI) field of a random access response physical downlink control channel (PDCCH) based at least in part on monitoring the PDCCH.

92. The UE of claim 91, wherein the DCI is associated with a cyclic redundancy check (CRC), wherein the CRC is demasked using a group radio network temporary identifier (RNTI).

93. A UE as claimed in claim 91, wherein the DCI is decoded to determine a resource assignment for a random access response physical downlink shared channel (PDSCH), wherein the indication of the type granted to the uplink group is carried in the random access response PDSCH.

94. The UE of claim 73, wherein the random access response and the uplink group grant are decoded.

95. The UE of claim 73, wherein timing advance TA, modulation and coding scheme MCS, power control, beam management and time-frequency resource allocation are applied in association with transmitting the uplink communication.

96. The UE of claim 73, wherein the random access response comprises a status of the uplink group grant, the status comprising at least one of: information identifying the number of uplink group grants included in the random access response, or The indication of the type of grant granted to the uplink group.

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