Power Control of Hybrid Automatic Repeat Request Feedback Signal in Random Access

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may receive a response message associated with a random access message, wherein the response message includes an identifier of the UE; select an uplink channel or a format of an uplink signal for confirming successful decoding of the response message; determine a transmit power of a hybrid automatic repeat request (HARQ) acknowledgement (ACK) information based at least in part on at least one of the following: a message type of the response message, a random access mode associated with the random access message, a power control configuration used by a previous transmission of the random access message, or a format of an uplink channel or an uplink signal; and transmit HARQ ACK information using a power control process based at least in part on the transmit power. Many other aspects are provided.

Description

Technical Field

[0001] Aspects of the present disclosure generally relate to wireless communications and techniques and apparatus for power control of hybrid automatic repeat request (HARQ) feedback signals in random access. Background Art

[0002] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcast. Typical wireless communication systems may employ multiple access technologies that are capable of supporting communications with multiple users by sharing available system resources (e.g., bandwidth, transmit power, and / or the like). 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).

[0003] A wireless communication network may include multiple base stations (BS) that can support communication of multiple user equipments (UEs). User equipments (UEs) may communicate with base stations (BSs) via downlinks and uplinks. A downlink (or forward link) refers to a communication link from a BS to a UE, and an uplink (or reverse link) refers to a 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 / or the like.

[0004] The above-mentioned multiple access technologies have been adopted in various telecommunication standards to provide common protocols that enable different user devices to communicate at the city, country, region and even global level. New Radio (NR), which may also be referred to as 5G, is a set of enhancements 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 better integrating with other open standards by using orthogonal frequency division multiplexing (OFDM) with cyclic prefix (CP) (CP-OFDM) on the downlink (DL) and CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), as well as by supporting beamforming, multiple input multiple output (MIMO) antenna technology, and carrier aggregation. However, with the increasing demand for mobile broadband access, LTE and NR technologies need to be further improved. Preferably, these improvements should be applicable to other multiple access technologies and telecommunication standards that adopt these technologies. Summary of the invention

[0005] In some aspects, a wireless communication method performed by a user equipment (UE) may include: receiving a response message associated with a random access message, wherein the response message includes an identifier of the UE; selecting a format of an uplink channel or uplink signal for confirming successful decoding of the response message; determining a transmit power of a hybrid automatic repeat request (HARQ) acknowledgment (ACK) information based at least in part on at least one of: a message type of the response message, a random access mode associated with the random access message, a power control configuration used by a previous transmission of the random access message, or a format of an uplink channel or uplink signal; and sending the HARQ ACK information using a power control process based at least in part on the transmit power and the identifier.

[0006] 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: receive a response message associated with a random access message, wherein the response message includes an identifier of the UE; select an uplink channel or a format of an uplink signal for confirming successful decoding of the response message; determine a transmit power of HARQ ACK information based at least in part on at least one of: a message type of the response message, a random access mode associated with the random access message, a power control configuration used by a previous transmission of the random access message, or a format of an uplink channel or an uplink signal; and transmit the HARQ ACK information using a power control process based at least in part on the transmit power and the identifier.

[0007] In certain 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: receive a response message associated with a random access message, wherein the response message includes an identifier of the UE; select an uplink channel or a format of an uplink signal for confirming successful decoding of the response message; determine a transmit power of HARQ ACK information based at least in part on at least one of: a message type of the response message, a random access mode associated with the random access message, a power control configuration used by a previous transmission of the random access message, or a format of an uplink channel or an uplink signal; and transmit the HARQ ACK information using a power control process based at least in part on the transmit power and the identifier.

[0008] In some aspects, an apparatus for wireless communication may include: a component for receiving a response message associated with a random access message, wherein the response message includes an identifier of the apparatus; a component for selecting a format of an uplink channel or an uplink signal for confirming successful decoding of the response message; a component for determining a transmit power of HARQ ACK information based at least in part on at least one of: a message type of the response message, a random access mode associated with the random access message, a power control configuration used by a previous transmission of the random access message, or a format of the uplink channel or the uplink signal; and a component for sending the HARQ ACK information using a power control process based at least in part on the transmit power and the identifier.

[0009] Aspects generally include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems as substantially described herein with reference to and as illustrated by the accompanying drawings and description.

[0010] The foregoing fairly broadly summarizes the features and technical advantages of examples according to the present disclosure so that the following detailed description may be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples may be easily used as a basis for modifying or designing other structures to achieve the same purpose of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. When considered in conjunction with the accompanying drawings, the characteristics of the concepts disclosed herein, their organization and methods of operation, and associated advantages will be better understood from the following description. Each figure is provided for the purpose of illustration and description, and not as a definition of the limitations of the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to be able to understand the above features of the present disclosure in detail, a more specific description briefly summarized above may be made by reference to various aspects, some of which are shown in the accompanying drawings. However, it should be noted that the attached drawings only illustrate certain typical aspects of the present disclosure and should not be considered as limiting the scope thereof, as the description may allow for other equivalent aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0012] Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0013] Figure 2 is a block diagram conceptually illustrating an example of a base station communicating with a UE in a wireless communication network in accordance with various aspects of the present disclosure.

[0014] Figure 3 is a diagram illustrating an example of a hybrid automatic repeat request (HARQ) acknowledgement (ACK) transmit power determination for a two-step random access procedure in accordance with various aspects of the present disclosure.

[0015] Figure 4 is a diagram illustrating an example of HARQ ACK transmit power determination for a four-step random access procedure associated with a backoff from a two-step random access procedure in accordance with various aspects of the present disclosure.

[0016] Figure 5 is a diagram illustrating example processing performed, for example, by a user device, according to various aspects of the present disclosure. DETAILED DESCRIPTION

[0017] The various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be embodied in many different forms and should not be interpreted as being limited to any specific structure or function throughout the present disclosure. On the contrary, these aspects are provided so that the present disclosure will be thorough and complete, and the scope of the present disclosure will be fully conveyed to those skilled in the art. Based on the teachings of this article, it should be understood by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is implemented independently of any other aspect of the present disclosure or implemented in combination with any other aspect of the present disclosure. For example, any number of aspects described herein can be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover devices and methods that are practiced using other structures, functions, or structures and functions other than the various aspects disclosed herein. It should be understood that any aspect of the present disclosure disclosed herein can be embodied by one or more elements of the claims.

[0018] Several aspects of telecommunication systems will now be described with reference to various devices and techniques. These devices and techniques will be described in the detailed description below and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms and / or the like (collectively referred to as "elements"). These elements may be implemented using hardware, software, or any combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0019] It should be noted that although various aspects may be described herein using terminology generally associated with 3G and / or 4G wireless technologies, various aspects of the present disclosure may be applied to other generation-based communication systems, such as 5G and later, including NR technologies.

[0020] Figure 1 1 is a schematic 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 multiple BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A BS is an entity that communicates with a user equipment (UE) and may also be referred to as a base station, NR BS, Node B, gNB, 5G Node B (NB), access point, transmit receive point (TRP), and / or 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.

[0021] 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 to UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access to UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access to UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1In the example shown, BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102c. A BS may support one or more (e.g., three) cells. In this document, the terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "Node B", "5G NR", and "cell" may be used interchangeably.

[0022] In some aspects, the cells may not necessarily be fixed, 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 similar interfaces using any suitable transport networks.

[0023] The wireless network 100 may also include a relay station. A relay station is an entity that can receive a data transmission from an upstream station (e.g., a BS or a UE) and send the data transmission to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions of other UEs. Figure 1 In the example shown, 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, and / or the like.

[0024] The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relay BSs, and / or the like). 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 higher 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).

[0025] A network controller 130 may be coupled to a set of BSs and may provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with each other directly or indirectly, for example, via a wireless or wired backhaul.

[0026] UE 120 (e.g., 120a, 120b, 120c) can be dispersed throughout the wireless network 100, and each UE can be fixed or mobile. UE can also be referred to as an access terminal, terminal, mobile station, subscriber unit, station and / or the like. UE can 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 computer, 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-mounted 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.

[0027] Some UEs may be considered to be machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, and / or the like, which may communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may, for example, provide a connection for or to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered to be Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered to be customer premises equipment (CPE). UE 120 may be included in a housing that houses components of UE 120 (such as processor components, memory components, and / or the like).

[0028] Generally, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific RAT and can operate on one or more frequencies. RAT can also be referred to as radio technology, air interface and / or the like. Frequency can also be referred to as carrier, frequency channel and / or class and the like. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0029] 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 for communicating 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, and / or the like), mesh networks, and / or the like. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations performed by base station 110 as described elsewhere herein.

[0030] As mentioned above, providing Figure 1 As an example. Other examples can be related to Figure 1 The description is different.

[0031] Figure 2 A block diagram of a design 200 of a base station 110 and a UE 120 is shown, where base station 102 and UE 104 may be Figure 1 Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general T≥1 and R≥1.

[0032] 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) and / or the like) and control information (e.g., CQI requests, grants, upper layer signaling, and / or the like), 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)). If applicable, the transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, and can provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 can process a respective output symbol stream (e.g., for OFDM and / or the like) to obtain an output sample stream. Each modulator 232 can further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t can be transmitted via T antennas 234a to 234t, respectively. According to various aspects described in more detail below, position coding can be used to generate synchronization signals to convey additional information.

[0033] At the UE 120, antennas 252a to 252r may receive downlink signals from the 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 and / or the like) 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 (if applicable), and provide detected symbols. A receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for the 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 a reference signal received power (RSRP), a received signal strength indicator (RSSI), a reference signal received quality (RSRQ), a channel quality indicator (CQI), and / or the like. In some aspects, one or more components of UE 120 may be included in a housing.

[0034] 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, and / or the like). 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 to 254r (e.g., for DFT-s-OFDM, CP-OFDM, and / or the like), and transmitted to the base station 110. At the base station 110, uplink signals from the UE 120 and other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain decoded data and control information sent by the UE 120. The receive processor 238 may provide decoded data to a data sink 239 and 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.

[0035] 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 controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component of the can perform or direct, e.g. 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. In some aspects, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, when executed by one or more processors of base station 110 and / or UE 120, the one or more instructions may perform or direct, for example, Figure 5 The operations of process 500 and / or other processes as described herein. Scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0036] In some aspects, UE 120 may include: a component for receiving a response message associated with a random access message, wherein the response message includes an identifier of the UE; a component for selecting an uplink channel or a format of an uplink signal for confirming successful decoding of the response message; a component for determining a transmit power of hybrid automatic repeat request (HARQ) acknowledgement (ACK) information; a component for transmitting HARQ ACK information using a power control process based at least in part on the transmit power and the identifier; a component for receiving a transmit power control command in at least one of the following: downlink control information (DCI) carried by a downlink control channel of the response message, or a successful random access response carried by a downlink shared channel of the response message; a component for receiving signaling indicating a configuration of at least one of a power control mode or a power control parameter for determining the transmit power, and / or the like. In some aspects, such a component may include a component for combining Figure 2 One or more components of UE 120 are depicted, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, demodulator (DEMOD) 254, MIMO detector 256, receive processor 258, and the like.

[0037] As mentioned above, providing Figure 2 As an example. Other examples can be related to Figure 2 The description is different.

[0038] The UE may use a random access procedure to access a cell. For example, the random access procedure may include a two-step random access procedure, a four-step random access procedure, etc. In NR, the two-step random access procedure may be used for contention-based random access (CBRA) and contention-free random access (CFRA). For example, CBRA may be used in any RRC state (e.g., idle, inactive, or connected), while CFRA may be used in an RRC connected state.

[0039] In some cases, the UE may initiate a two-step random access procedure by sending a random access message such as a random access channel (RACH) message A. The two-step random access procedure may be performed differently depending on the result of the base station's processing of the random access message. For example, the base station may send a successful random access response (RAR), a fallback RAR, or a backoff indicator in a response message depending on the result of the processing of the preamble and / or the payload of the random access message. For example, the base station may provide a successful RAR, a fallback RAR, or a backoff indicator in a response message such as a RACH message B.

[0040] If the UE does not receive a successful RAR, the UE may resend the payload and / or preamble of the random access message (e.g., may retry the two-step random access procedure or return to the four-step random access procedure). If the base station is able to decode the resent preamble and / or payload, the base station may respond with a successful RAR or a fourth message of the four-step random access procedure. If the UE successfully decodes the successful RAR or the fourth message, the UE may send HARQ ACK information to complete the random access procedure.

[0041] The HARQ ACK information may be mapped to multiple different uplink physical channels or physical signals, which may be associated with different signaling overheads and reliabilities. In addition, the transmission of the HARQ ACK information may introduce inter-cell or intra-cell interference and may use UE battery power. Therefore, a single or inflexible method for determining the transmit power of the HARQ ACK information may increase interference and UE battery power usage.

[0042] Some techniques and devices described herein provide power control of HARQ ACK information associated with a random access process. For example, some techniques and devices described herein provide mapping of HARQ ACK information to one or more bits. Some techniques and devices described herein provide open-loop power control or closed-loop power control for HARQ ACK information. For example, this document provides a power control formula based at least in part on the bandwidth, carrier, cell, and transmission timing of the HARQ ACK information. Power control can also be based at least in part on the format of the uplink channel or uplink signal used for the HARQ ACK information, the message type of the response message, the random access mode associated with the response message, the power control configuration for determining the transmission power, etc. In this way, inter-cell and intra-cell interference can be reduced, and UE power utilization can be improved.

[0043] Figure 3 1 is a diagram illustrating an example 300 of HARQ ACK transmit power determination for a two-step random access procedure in accordance with various aspects of the present disclosure. As shown, example 300 includes UE 120 and BS 110.

[0044] As shown in the reference numeral 310, the BS 110 may provide the UE 120 with a synchronization signal block and random access channel (RACH) configuration information. The RACH configuration information may identify the configuration of the two-step RACH process. In some aspects, the RACH configuration information may identify power control parameters. For example, the power control parameters of CBRA may be different from those of CFRA. In some aspects, the RACH configuration information may include an indication of whether the response message is to use a physical uplink control channel (PUCCH), uplink control information (UCI) multiplexed with a physical uplink shared channel (PUSCH), an uplink reference signal, etc. In some aspects, the RACH configuration information may indicate the format of the response message (e.g., a long PUCCH format, a short PUCCH format, and / or the like). In some aspects, the RACH configuration information may indicate a bandwidth part, an uplink carrier, a parameter set (numerology), a reference index for path loss measurement, and / or the like. In some aspects, the RACH configuration information may indicate a random access preamble index allocated to the UE during the CFRA process.

[0045] As shown at reference numeral 320, the UE 120 may send, and the base station 110 may receive, a random access message (e.g., RACH MsgA or Message A) of a two-step random access procedure. For example, the UE 120 may send the random access message according to the RACH configuration information received in conjunction with reference numeral 310. The random access message may include a preamble and a payload (e.g., PUSCH). The BS 110 may perform different actions based on whether the BS 110 successfully decodes one or more of the preamble and the payload. In some aspects, the UE 120 may send the preamble and / or the payload using a specific power control configuration, which is described in more detail elsewhere herein.

[0046] In example 300, BS 110 successfully decodes the payload and preamble, as shown at 330. For an example when BS 110 detects only the preamble but not the payload, refer to Figure 4 . If BS 110 fails to decode the preamble, BS 110 may perform no action and UE 120 may resend the message indicated by reference numeral 320. In example 300, BS 110 may detect the preamble, identify a payload based at least in part on the preamble, and decode the payload. As indicated by reference numeral 340, BS 110 sends a response message associated with the random access message indicated by reference numeral 320. Here, the response message includes a two-step random access procedure MsgB successful random access response (RAR) based at least in part on BS 110 successfully decoding the preamble and payload.

[0047] As further shown, the response message includes an identifier of UE 120. For example, the identifier may be a unique identifier of UE 120. In some aspects, the identifier may include an inactive state radio network temporary identifier (RNTI), an idle state RNTI, a cell-specific RNTI, a random access preamble index (RAPID) allocated to the UE during the CFRA procedure, and / or the like. UE 120 may provide HARQ ACK information based at least in part on identifying the identifier in the response message, as described in more detail below.

[0048] As shown in reference numeral 350, UE 120 may determine a transmit power for HARQ ACK information. For example, UE 120 may successfully decode the response message and may accordingly provide HARQ ACK information indicating that the response message was successfully decoded, thereby completing the random access procedure. Techniques and apparatus described herein provide for determination of transmit power and / or power control procedures for transmission of HARQ ACK information, thereby improving UE power utilization and reducing inter-cell interference and intra-cell interference.

[0049] UE 120 may determine the transmit power based at least in part on the power control configuration. In some aspects, a power control parameter associated with the power control configuration may be indicated in system information (SI) (e.g., for inactive or idle UEs), radio resource control (RRC) signaling (e.g., for connected UEs), and / or the like using a lookup table associated with a two-step RACH. For example, UE 120 may receive signaling indicating a configuration of at least one of a power control mode (e.g., open loop power control, closed loop power control, and / or the like) or a power control parameter (described in more detail below in conjunction with Formula 1). In this case, an index to the lookup table may be indicated to UE 120 in system information, such as a system information block.

[0050] In some aspects, UE 120 may perform a power control process, such as an open-loop power control process, a closed-loop power control process, or a combination of an open-loop power control process and a closed-loop power control process, to determine the transmit power for the HARQ ACK information. In some aspects, UE 120 may determine the HARQ ACK information (P HF，b，f，c (i, q d , l)):

[0051]

[0052] In Formula 1, b represents the bandwidth part, f represents the carrier, c represents the cell, and i represents the transmission opportunity. The path loss compensation value is given by α b，f，c Indicates. Reference signal index q d The path loss value at PL is given by b，f，c (q d ) is represented by P. 0_HF，b，f，c The offset associated with MCS is represented by Δ TF，b，f，c The maximum transmit power of UE 120 is represented by P cmax，f，c (i) represents the dynamic offset. b，f，c In some aspects, the dynamic offset can be represented by and g b，f，c (0, l) = Δ ramp-up，b，f，c +δ msgB，b，f，c Each of the above terms of Formula 1 will be described in more detail below.

[0053] Path loss compensation value (α b，f，c) may include a full path loss compensation value (e.g., a path loss that is fully offset by the HARQ ACK information) or a partial path loss value (e.g., a path loss that is partially offset by the HARQ ACK information). In some aspects, the path loss compensation value may be based at least in part on an uplink channel or an uplink signal. For example, if the uplink channel is a PUCCH, the path loss compensation value may be a full path loss compensation value. If the uplink channel is a UCI carried on a PUSCH, the path loss compensation value may be a full path loss compensation value or a partial path loss compensation value. In this case, the path loss compensation value may be based on the power control configuration of the PUSCH on which the UCI is carried. If the uplink signal is an uplink reference signal, the path loss compensation value may be a full path loss compensation value or a partial path loss compensation value.

[0054] In some aspects, the nominal UE transmit power may be based at least in part on a previous nominal UE transmit power of a random access message (e.g., a random access message indicated by reference numeral 310 or a transmission of a random access message prior to the random access message indicated by reference numeral 310). For example, the nominal UE transmit power may be based at least in part on a nominal UE transmit power of a preamble of a random access message or a payload of a random access message. In some aspects, the nominal UE transmit power may be based at least in part on a previous nominal UE transmit power and at least in part on an offset (such as a UE-specific offset). In some aspects, the nominal UE transmit power may be indicated using signaling (such as system information or radio resource control (RRC) signaling). In some aspects, the nominal UE transmit power may be based at least in part on an indication value having an offset such as a UE-specific offset (e.g., using SI or RRC signaling).

[0055] The offset (Δ TF，b，f，c ) may consider the MCS based at least in part on the transport format (TF) of the HARQ ACK information. In some aspects, the MCS-related offset may be set to a fixed value (such as zero). In some aspects, the MCS-related offset may follow the configuration rules of the physical channel or physical signal used to carry the HARQ ACK. For example, for HARQ ACK information provided using piggybacked UCI, the offset may be configured (e.g., semi-static offset) (e.g., using RRC signaling and / or the like).

[0056] Dynamic offset (g b，f，c (i, l)) can be based at least in part on the sum of the power ramp-up of the open loop power control process and the transmit power control (TPC) accumulation of the closed loop power control process. and g b，f，c (0, l) = Δramp-up，b，f，c +δ msgB，b，f，c In some aspects, the size of the power boost may be configured using a power control of a preamble or payload of a random access message, as indicated by reference numeral 310. In some aspects, the size of the power boost may be configured using SI, RRC signaling, a lookup table, and / or the like.

[0057] In some aspects, the UE 120 may use a bandwidth-dependent offset (not shown in the above formula) to determine the transmit power. For example, in some aspects, the bandwidth-dependent offset may be based at least in part on a parameter set for an uplink channel or uplink signal, a number of allocated resource blocks (RBs) for an uplink channel of the uplink signal, and / or the like. In some aspects, the bandwidth-dependent offset may be based at least in part on a scaling factor (e.g., a scaling factor applied to a value determined at least in part based on a parameter set and the number of allocated RBs), which may be configured using SI, RRC, and / or the like.

[0058] As shown in the above formula, UE 120 can use the path loss compensation value (α) determined according to the reference signal index b，f，c ×PL b，f，c (q d In some aspects, the reference signal index may reference a preamble or payload of a random access message, as indicated by reference numeral 310, or may be signaled to the UE 120 in a reference signal configuration (e.g., using SI, RRC signaling, and / or the like).

[0059] In some aspects, the UE 120 may suspend the power ramp counter. For example, the UE 120 may suspend the power ramp counter based at least in part on a power control configuration of a preamble or a payload of a random access message as shown in reference numeral 310. As another example, the UE 120 may suspend the power ramp counter when the UE 120 changes a transmit space counter for transmission of HARQ ACK information, when the UE 120 changes a bandwidth portion, when the UE 120 changes an uplink carrier, or based at least in part on receiving a DCI indicating that the power ramp counter is suspended.

[0060] As indicated by reference numeral 360, UE 120 may use a power control procedure and transmit HARQ ACK information (indicated by reference numeral 370) based at least in part on the transmit power determined in conjunction with reference numeral 350. In some aspects, the power control procedure may be used to determine the transmit power. In some aspects, the transmit power may be used as part of the power control procedure.

[0061] In some aspects, UE 120 may determine transmit power and / or perform a power control process based at least in part on a TPC command. The TPC command may indicate that UE 120 will increase or decrease transmit power. For example, UE 120 may track TPC commands from BS110 to determine transmit power. In some aspects, for open-loop power control, TPC commands may be disabled. In some aspects, for closed-loop power control, the TPC command may be a carrier in the DCI of the physical downlink control channel (PDCCH) of the MsgB successful RAR shown by reference numeral 340. In some aspects, the TPC command may be carried in a sub-protocol data unit (sub-PDU) of the physical downlink shared channel (PDSCH) of the MsgB successful RAR shown by reference numeral 340. In some aspects, the TPC command may be a UE-specific TPC command. In some aspects, the TPC command may be multicast to a UE group including UE 120 as a group common TPC command.

[0062] As shown in the reference numeral 370, UE 120 may send HARQ ACK information. In some aspects, the HARQ ACK information may be mapped to a single bit. In some aspects, the HARQ ACK information may be mapped to multiple bits. For example, multiple bits may include a repetition or coding sequence of the HARQ ACK information, or multiplexing of the HARQ ACK information with another uplink transmission (e.g., a scheduling request, a beam management report, a channel state report, and / or the like). In some aspects, the HARQ ACK information may be mapped to a PUCCH, such as a PUCCH associated with a short PUCCH format or a long PUCCH format. In some aspects, the UE 120 and / or the BS 110 may determine the format of the uplink channel based at least in part on the waveform of the random access message (e.g., CP-OFDM or DFT-s-OFDM), the waiting time requirement of the random access process associated with the random access message, or at least one of the multiplexing capacity requirements of the UE 120.

[0063] In some aspects, the HARQ ACK information is mapped to UCI multiplexed with the PUSCH (e.g., by puncturing or rate matching the PUSCH). In some aspects, the HARQ ACK information may be mapped to an uplink reference signal, such as a sounding reference signal, a demodulation reference signal, a preamble, a sequence associated with a threshold peak-to-average power ratio, and / or the like. Using a signal with a threshold peak-to-average power ratio (e.g., a low peak-to-average power ratio) may improve the performance of the signal by reducing degradation of the waveform.

[0064] As mentioned above, providing Figure 3 As an example. Other examples can be related to Figure 3The description is different.

[0065] Figure 4 4 is a diagram illustrating an example 400 of HARQ ACK transmit power determination for a four-step random access procedure associated with a fallback from a two-step random access procedure in accordance with various aspects of the present disclosure. Example 400 includes a UE 120 and a BS 110. Figure 4 As shown, and by reference numeral 410, example 400 is an example in which BS 110 detects only the preamble of RACH message A. In other words, in example 400, BS 110 fails to decode the payload of RACH message A.

[0066] As shown in reference numeral 420, BS 110 may send an indication that BS 110 failed to decode the payload of RACH message A. Here, the indication includes a fallback RAR, such as a sub-PDU indicating that UE 120 will fall back to a four-step random access procedure. Therefore, as shown in reference numeral 430, UE 120 retransmits the payload of the random access message (e.g., PUSCH) using a message similar to message 3 of the four-step random access procedure. As shown in reference numeral 440, BS 110 successfully decodes the retransmission (ReTX) of the payload. Therefore, as shown in reference numeral 450, BS 110 sends a response message (e.g., RACH message 4 of the four-step RACH procedure). As further shown, the response message includes an identifier of UE 120.

[0067] As indicated by reference numerals 460 and 470, UE 120 may determine a transmit power for the HARQ ACK information and may transmit the HARQ ACK information (indicated by reference numeral 480). Figure 3 Reference numerals 350 and 360 of the accompanying drawings describe the determination of the transmit power and the power control process in more detail. It should be understood that references to the determination of the transmit power or the power control process based at least in part on the random access message shown by reference numeral 320 may also apply to references based at least in part on the random access message. Figure 4 MsgA in determines the transmission power or power control process used for sending HARQ ACK information 480.

[0068] As mentioned above, providing Figure 4 As an example. Other examples can be related to Figure 4 The description is different.

[0069] 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 and / or the like) performs power control of HARQ feedback signals in random access.

[0070] like Figure 5 As shown, in some aspects, process 500 may include receiving a response message associated with the random access message, wherein the response message includes an identifier of the UE (block 510). For example, as described above, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, and / or the like) may receive a response message associated with the random access message. In some aspects, the response message includes an identifier of the UE.

[0071] like Figure 5 As further shown in FIG. 5 , in some aspects, the process 500 may include selecting a format of an uplink channel or uplink signal to confirm successful decoding of the response message (block 520). For example, as described above, the UE (e.g., using the receive processor 258, the transmit processor 264, the controller / processor 280, the memory 282, and / or the like) may select a format of an uplink channel or uplink signal to confirm successful decoding of the response message. The format may include, for example, a PUCCH format, an uplink reference signal format, a UCI piggybacked on a PUSCH format, and / or the like. In some aspects, the process 500 may not include selecting a format of an uplink channel or uplink signal.

[0072] like Figure 5 As further shown in FIG. 5 , in some aspects, the process 500 may include determining a transmit power for the HARQ ACK information based at least in part on at least one of: a message type of the response message, a random access mode associated with the random access message, a power control configuration used by a previous transmission of the random access message, or a format of an uplink channel or uplink signal (block 530). For example, as described above, a user equipment (UE) (e.g., using the receive processor 258, the transmit processor 264, the controller / processor 280, the memory 282, and / or the like) may determine a transmit power for the hybrid automatic repeat request (HARQ) acknowledgement (ACK) information based at least in part on at least one of: a message type of the response message, a random access mode associated with the random access message (e.g., a two-step mode, a four-step back-off mode, and / or the like), a power control configuration used by a previous transmission of the random access message (e.g., the random access message 320, a previous transmission of the random access message prior to the random access message 320, and / or the like), or a format of an uplink channel or uplink signal.

[0073] like Figure 5As further shown in FIG. 5 , in some aspects, process 500 may include sending HARQ ACK information using a power control process based at least in part on the transmit power and at least in part on the identifier (block 540). For example, as described above, a user equipment (UE) (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, and / or the like) may send HARQ ACK information using a power control process based at least in part on the transmit power and the identifier.

[0074] 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.

[0075] In a first aspect, the message type of the response message includes at least one of the following: a successful random access response of a two-step random access procedure, or a RACH message 4 of a four-step random access procedure.

[0076] In a second aspect, alone or in combination with the first aspect, the HARQ ACK information indicates that the response message is successfully decoded and the identifier is detected.

[0077] In a third aspect, either alone or in combination with one or more of the first and second aspects, the identifier comprises at least one of an inactive or idle state radio network temporary identifier (RNTI), a cell-specific RNTI, or a random access preamble index (RAPID) allocated to the UE in a contention-free random access procedure.

[0078] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the HARQ ACK information is mapped to a single bit.

[0079] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, the HARQ ACK information is mapped to a plurality of bits, and the plurality of bits are associated with at least one of: a repeated or encoded sequence of the HARQ ACK information, or multiplexing of the HARQ ACK information with another uplink transmission.

[0080] In the sixth aspect, alone or in combination with one or more of the first to fifth aspects, the format of the uplink channel is determined at least in part based on at least one of: a waveform of a random access message, a waiting time requirement of a random access procedure associated with the random access message, or a multiplexing capacity requirement of the UE, and the uplink channel includes a physical uplink control channel.

[0081] In a seventh aspect, either alone or in combination with one or more of aspects 1 to 6, HARQ ACK information is mapped to uplink control information (UCI), which is multiplexed with a physical uplink shared channel based at least in part on puncturing or rate matching of the physical uplink shared channel.

[0082] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, HARQ ACK information is mapped to an uplink reference signal.

[0083] In a ninth aspect, either alone or in combination with one or more of aspects 1 to 8, the power control process is an open-loop power control process, and a configuration associated with the open-loop power control process is based at least in part on a preamble or payload of a previous transmission of a random access message.

[0084] In the tenth aspect, either alone or in combination with one or more of aspects 1 to 9, the power control process is a closed-loop power control process, and the configuration associated with the closed-loop power control process is based at least in part on a preamble or payload of a previous transmission of a random access message.

[0085] In the eleventh aspect, alone or in combination with one or more of aspects one to ten, processing 500 includes receiving a transmit power control command in at least one of: downlink control information (DCI) carried by a downlink control channel of a response message, or a successful random access response carried by a downlink shared channel of a response message.

[0086] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the process 500 includes receiving signaling indicating a configuration of at least one of a power control mode or a power control parameter for determining transmit power.

[0087] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the signaling is carried by system information (SI) and radio resource control (RRC) signaling for a UE in a connected state.

[0088] In a fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, the signaling is carried by a radio resource control (RRC) signaling for a UE in a connected state.

[0089] In a fifteenth aspect, alone or in combination with one or more of aspects one to fourteen, determining the transmit power is based at least in part on whether the HARQ ACK information is mapped to a physical uplink control channel, uplink control information, or an uplink reference signal.

[0090] In the sixteenth aspect, alone or in combination with one or more of the first to fifteenth aspects, the transmit power is determined based at least in part on at least one of: whether the UE's power ramp counter is paused, whether a transmit power control (TPC) command is received, or whether the UE's maximum transmit power is reached.

[0091] In the seventeenth aspect, alone or in combination with one or more of the first to sixteenth aspects, the power ramp counter of the UE is suspended based on at least at least one of: a change in the transmit spatial filter, a change in the bandwidth portion, a change in the uplink carrier, or downlink control information received by the UE.

[0092] In the eighteenth aspect, alone or in combination with one or more aspects of the first to seventeen, the transmit power is determined at least in part based on a nominal transmit power of the UE, wherein the nominal transmit power is based at least on at least one of: a nominal transmit power of a preamble of a previous transmission of a random access message, a nominal transmit power of a payload of a previous transmission of a random access message, a UE-specific offset, or a network-configured offset indicated by system information or radio resource control signaling.

[0093] In the nineteenth aspect, alone or in combination with one or more of the first to eighteenth aspects, the transmit power is determined at least in part based on an offset, which is at least in part based on a modulation and coding scheme (MCS) of the UE, and which is at least in part based on the format of an uplink channel or uplink signal carrying HARQ ACK information.

[0094] In the twentieth aspect, either alone or in combination with one or more of the first to nineteenth aspects, the transmit power is determined based at least in part on a power ramp-up process of the UE or at least one of the accumulated values ​​associated with a transmit power control (TPC) command.

[0095] In a twenty-first aspect, alone or in combination with one or more of the first to twentieth aspects, the TPC command comprises a UE-specific TPC command.

[0096] In a twenty-second aspect, alone or in combination with one or more of the first to twenty-first aspects, the TPC command is multicast as a group common TPC command to a UE group including the UE.

[0097] In a twenty-third aspect, alone or in combination with one or more of the first to twenty-second aspects, determining the transmit power is based at least in part on a bandwidth of an uplink channel or an uplink signal.

[0098] In aspect twenty-four, alone or in combination with one or more of aspects one to twenty-third, the transmit power is determined based at least in part on a reference signal index configured for path loss measurement, wherein the reference signal index is based at least in part on at least one of: a reference signal index of a previously transmitted preamble or payload of a random access message, or a resource signal configuration of the UE.

[0099] In a twenty-fifth aspect, alone or in combination with one or more of the first to twenty-fourth aspects, the identifier is a unique identifier.

[0100] Although Figure 5 Example blocks of process 500 are shown, but in some aspects, process 500 may include additional blocks, fewer blocks, different blocks, or different Figure 5 The blocks of process 500 may be arranged differently than those shown. Additionally or alternatively, two or more blocks of process 500 may be performed in parallel.

[0101] 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 are possible in light of the above disclosure or may be acquired from practice of these aspects.

[0102] 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 in hardware, firmware, and / or a combination of hardware and software.

[0103] As used herein, satisfying a threshold may mean 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, and / or the like, depending on the context.

[0104] It will be apparent that the systems and / or methods described herein can be implemented in various forms of hardware, firmware, and / or combinations of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit these aspects. Therefore, the operation and behavior of the systems and / or methods are described herein without reference to specific software code—it is understood that software and hardware can be designed to implement systems and / or methods based at least in part on the description herein.

[0105] Although specific combinations of features are listed 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 each dependent claim combined with each other claim in the claim set. The phrase "at least one" referring to the list 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 multiples of the same element (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, ccc or any other order of a, b and c).

[0106] Unless explicitly described in this way, any element, behavior or instruction used in this article should not be interpreted as key or necessary. Moreover, as used herein, the articles "a" and "an" are intended to include one or more items, and can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more items (e.g., related items, unrelated items, combinations of related and unrelated items and / or the like), and can be used interchangeably with "one or more". If only one item is intended, the phrase "only one" or similar language is used. Moreover, as used herein, the terms "has", "have", "having" and / or the like are intended to be open terms. In addition, unless otherwise explicitly stated, the phrase "based on" is intended to represent "based at least in part on".

Claims

1. A wireless communication method performed by a user equipment (UE), comprising: receiving a response message associated with the random access message; selecting an uplink channel or a format of an uplink signal for confirming successful decoding of the response message; Determining a transmit power for hybrid automatic repeat request (HARQ) acknowledgement (ACK) information based at least in part on at least one of: The message type of the response message, a random access mode associated with the random access message, the power control configuration used by a previous transmission of the random access message, or a format of the uplink channel or the uplink signal; as well as The HARQ ACK information is sent using a power control procedure and in accordance with the transmit power based at least in part on an identifier identifying the UE in the response message.

2. The method according to claim 1, wherein: The message type of the response message includes at least one of the following: A successful Random Access Response of the two-step Random Access procedure, or RACH message 4 of the four-step random access procedure.

3. The method according to claim 1, wherein: The HARQ ACK information indicates that the response message is successfully decoded and the identifier is detected.

4. The method according to claim 1, wherein: The identifier includes at least one of the following: Inactive or idle state Radio Network Temporary Identifier (RNTI), Cell-specific RNTI, or A random access preamble index (RAPID) allocated to the UE in a contention-free random access procedure.

5. The method according to claim 1, wherein: The HARQ ACK information is mapped to a single bit.

6. The method according to claim 1, wherein: The HARQ ACK information is mapped to a plurality of bits, and The plurality of bits are associated with at least one of the following: a repeated or encoded sequence of the HARQ ACK information, or The HARQ ACK information is multiplexed with another uplink transmission.

7. The method according to claim 1, wherein: The format of the uplink channel is determined based at least in part on at least one of: The waveform of the random access message, the latency requirement of a random access procedure associated with the random access message, or the multiplexing capacity requirement of the UE, and Wherein, the uplink channel includes a physical uplink control channel.

8. The method according to claim 1, wherein: The HARQ ACK information is mapped to uplink control information (UCI), which is multiplexed with a physical uplink shared channel based at least in part on puncturing or rate matching of the physical uplink shared channel.

9. The method according to claim 1, wherein: The HARQ ACK information is mapped to an uplink reference signal.

10. The method according to claim 1, wherein: The power control procedure is an open loop power control procedure, wherein a configuration associated with the open loop power control procedure is based at least in part on a preamble or payload of a previous transmission of the random access message, and Wherein, for the open-loop power control process, transmission of a transmit power control (TPC) command is prohibited.

11. The method according to claim 1, wherein: The power control procedure is a closed loop power control procedure, and wherein a configuration associated with the closed loop power control procedure is based at least in part on a preamble or payload of a previous transmission of the random access message.

12. The method according to claim 11, further comprising: Receiving a transmit power control command in at least one of the following: Downlink Control Information (DCI) carried by the downlink control channel of the response message, or A successful random access response is carried by the downlink shared channel of the response message.

13. The method according to claim 1, further comprising: Signaling indicating configuration of at least one of a power control mode or a power control parameter for determining the transmit power is received.

14. The method according to claim 13, wherein: The signaling is carried by System Information (SI) and Radio Resource Control (RRC) signaling for UEs in a connected state.

15. The method according to claim 13, wherein: The signaling is carried by Radio Resource Control (RRC) signaling for UEs in a connected state.

16. The method according to claim 1, wherein: Determining the transmit power is based at least in part on whether the HARQ ACK information is mapped to a physical uplink control channel, uplink control information, or an uplink reference signal.

17. The method according to claim 1, wherein: Determining the transmit power is based at least in part on at least one of: Whether the power ramp counter of the UE is paused, Whether a transmit power control (TPC) command is received, or Whether the maximum transmit power of the UE is reached.

18. The method according to claim 17, wherein: The power ramp counter of the UE is suspended based on at least one of the following: Transmit spatial filter changes, Changes in bandwidth, A change of uplink carrier, or The UE receives downlink control information.

19. The method according to claim 1, wherein: determining the transmit power based at least in part on a nominal transmit power of the UE, The nominal transmit power is based on at least one of the following: a nominal transmit power of the previously transmitted preamble of the random access message, a nominal transmit power of the previously transmitted payload of the random access message, UE specific offset, or Network configured offset indicated by system information or radio resource control signaling.

20. The method according to claim 1, wherein: Determining the transmit power is based at least in part on an offset, the offset being based at least in part on a modulation and coding scheme (MCS) of the UE, wherein the offset is based at least in part on a format of the uplink channel or the uplink signal carrying the HARQ ACK information.

21. The method according to claim 1, wherein: Determining the transmit power is based at least in part on at least one of a power ramp-up procedure of the UE or an accumulated value associated with a transmit power control (TPC) command.

22. The method according to claim 21, wherein: The TPC command includes a UE-specific TPC command.

23. The method according to claim 21, wherein: The TPC command is multicast as a group common TPC command to a UE group including the UE.

24. The method according to claim 1, wherein: Determining the transmit power is based at least in part on a bandwidth of the uplink channel or the uplink signal.

25. The method of claim 1, wherein: Determining the transmit power is based at least in part on a reference signal index configured for path loss measurement, wherein the reference signal index is based at least in part on at least one of: a reference signal index of the previously transmitted preamble or payload of the random access message, or A reference signal configuration of the UE.

26. The method of claim 1, wherein: The identifier is a unique identifier.

27. A user equipment (UE) for wireless communication, comprising: one or more memories; as well as One or more processors operably coupled to the one or more memories, the one or more processors configured to: receiving a response message associated with the random access message; selecting an uplink channel or a format of an uplink signal for confirming successful decoding of the response message; Determining a transmit power for hybrid automatic repeat request (HARQ) acknowledgement (ACK) information based at least in part on at least one of: The message type of the response message, a random access mode associated with the random access message, the power control configuration used by a previous transmission of the random access message, or said format of said uplink channel or said uplink signal; as well as The HARQ ACK information is sent using a power control procedure and in accordance with the transmit power based at least in part on an identifier identifying the UE in the response message.

28. The UE according to claim 27, wherein: The message type of the response message includes at least one of the following: A successful Random Access Response of the two-step Random Access procedure, or RACH message 4 of the four-step random access procedure.

29. A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising: One or more instructions, when executed by one or more processors of a user equipment (UE), cause the one or more processors to: receiving a response message associated with the random access message; selecting an uplink channel or a format of an uplink signal for confirming successful decoding of the response message; Determining a transmit power for hybrid automatic repeat request (HARQ) acknowledgement (ACK) information based at least in part on at least one of: The message type of the response message, a random access mode associated with the random access message, the power control configuration used by a previous transmission of the random access message, or said format of said uplink channel or said uplink signal; as well as The HARQ ACK information is sent using a power control procedure and in accordance with the transmit power based at least in part on an identifier identifying the UE in the response message.

30. An apparatus for wireless communication, comprising: means for receiving a response message associated with a random access message; means for selecting an uplink channel or a format of an uplink signal for confirming successful decoding of said response message; means for determining a transmit power for hybrid automatic repeat request (HARQ) acknowledgement (ACK) information based at least in part on at least one of: The message type of the response message, a random access mode associated with the random access message, the power control configuration used by a previous transmission of the random access message, or said format of said uplink channel or said uplink signal; as well as Means for transmitting the HARQ ACK information based at least in part on an identifier identifying the apparatus in the response message, using a power control procedure and in accordance with the transmit power.

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