Extended demodulation reference signal scrambling identifier for demodulation reference signal communication

Abstract

To reduce the possibility of a collision between different DMRSs in generating the DMRSs for multiplexing with content of message type A (msgA) using a demodulation reference signal (DMRS) scrambling identifier.SOLUTION: User equipment (UE) receives, from a base station (BS), information for identifying a quantity of DMRS sequences supported per antenna panel of the BS. The UE transmits a DMRS communication having one or more DMRS sequences configured based at least in part on the quantity of DMRS sequences supported per antenna panel and scrambled using an extended DMRS scrambling identifier that is based at least in part on a physical random access channel preamble.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This patent application claims priority to U.S. Provisional Patent Application No. 62 / 936,243, filed November 15, 2019, entitled "EXTENDED DEMODULATION REFERENCE SIGNAL SCRAMBLING IDENTIFIER FOR DEMODULATION REFERENCE SIGNAL COMMUNICATION," and U.S. Non-Provisional Patent Application No. 16 / 949,716, filed November 11, 2020, entitled "EXTENDED DEMODULATION REFERENCE SIGNAL SCRAMBLING IDENTIFIER FOR DEMODULATION REFERENCE SIGNAL COMMUNICATION," which are expressly incorporated herein by reference.

[0002] Aspects of the present disclosure generally relate to wireless communications and techniques and apparatus for enhanced demodulation reference signal (DMRS) scrambling identifiers for DMRS communications in uplink grant-free transmissions. [Background technology]

[0003] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. A typical wireless communication system may employ multiple access technologies capable of supporting 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 extensions to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the 3rd Generation Partnership Project (3GPP).

[0004] A wireless communication network may include several base stations (BSs) that can support communication for several user equipments (UEs). The user equipments (UEs) may communicate with the base stations (BSs) via a downlink and an uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As 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, etc.

[0005]

[0005] The above multiple access technologies have been adopted in various telecommunications standards to provide common protocols that enable different user equipment to communicate on a city, national, regional, or even global scale. New Radio (NR), sometimes referred to as 5G, is a set of extensions to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to improve spectral efficiency, lower costs, improve service, utilize new spectrum, and better support mobile broadband Internet access 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), better integrating with other open standards, as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. However, as demand for mobile broadband access continues to increase, further improvements to LTE and NR technologies are needed. Preferably, these improvements should be applicable to other multiple access technologies and the telecommunications standards that employ these technologies. Summary of the Invention

[0006]

[0006] In some aspects, a method of wireless communication implemented by a user equipment (UE) includes receiving information from a base station (BS) identifying a quantity of demodulation reference signal (DMRS) sequences supported per antenna panel of the BS, and transmitting a DMRS communication having one or more DMRS sequences configured at least in part based on the quantity of DMRS sequences supported per antenna panel and scrambled using an extended DMRS scrambling identifier based at least in part on a physical random access channel preamble.

[0007]

[0007] In some aspects, a UE for wireless communication includes a memory and one or more processors coupled to the memory, wherein the memory and the one or more processors are configured to receive information from a BS identifying a quantity of DMRS sequences supported per antenna panel of the BS, and transmit DMRS communication having one or more DMRS sequences configured based at least in part on the quantity of DMRS sequences supported per antenna panel and scrambled using an extended DMRS scrambling identifier based at least in part on a physical random access channel preamble.

[0008]

[0008] In some aspects, a non-transitory computer-readable medium storing one or more instructions for wireless communications includes one or more instructions that, when executed by one or more processors of a UE, cause the one or more processors to receive information from a BS identifying a quantity of DMRS sequences supported per antenna panel of the BS, and transmit DMRS communications having one or more DMRS sequences configured at least in part based on the quantity of DMRS sequences supported per antenna panel and scrambled using an extended DMRS scrambling identifier based at least in part on a physical random access channel preamble.

[0009]

[0009] In some aspects, an apparatus for wireless communications includes means for receiving information from a BS identifying a quantity of DMRS sequences supported per antenna panel of the BS, and means for transmitting DMRS communications having one or more DMRS sequences configured based at least in part on the quantity of DMRS sequences supported per antenna panel and scrambled using an extended DMRS scrambling identifier based at least in part on a physical random access channel preamble.

[0010]

[0010] 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 substantially as described in this specification with reference to and as illustrated by the accompanying drawings and specification.

[0011] The foregoing has outlined rather broadly the features and technical advantages of examples according to the present disclosure in order that the following detailed description may be better understood. Additional features and advantages are described below. The concepts and examples disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The nature of the concepts disclosed herein, both their organization and method of operation, together with associated advantages, will be better understood from the following description when considered in conjunction with the accompanying figures. Each of the figures is provided for the purpose of illustration and description, and not as a definition of the limits of the claims.

[0012]

[0012] So that the above-described features of the present disclosure may be understood in detail, a more particular description briefly summarized above may be had by reference to embodiments, some of which are illustrated in the accompanying drawings. It should be noted, however, that the description may lead to other equally effective embodiments, and therefore, the accompanying drawings illustrate only some typical embodiments of the present disclosure and should not be considered as limiting the scope of the present disclosure. The same reference numerals in different drawings may identify the same or similar elements. [Brief explanation of the drawings]

[0013] [Figure 1]

[0013] FIG. 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure. [Figure 2]

[0014] FIG. 1 is a block diagram conceptually illustrating an example of a base station in communication with a UE in a wireless communication network, in accordance with various aspects of the present disclosure. [Figure 3]

[0015] FIG. 1 illustrates an example of a channel structure for transmitting a Physical Random Access Channel (PRACH) message type A (msgA), in accordance with various aspects of the present disclosure. [Figure 4]

[0016] 10 illustrates an example of resource mapping for transmitting PRACH msgA in accordance with various aspects of the present disclosure. [Figure 5]

[0017] FIG. 1 illustrates an example of a transmit chain for transmitting PRACH msgA in accordance with various aspects of the present disclosure. [Figure 6]

[0018] 1 illustrates an example of using an extended DMRS scrambling identifier for DMRS communication, in accordance with various aspects of the present disclosure. [Figure 7]

[0019] FIG. 1 illustrates an example process performed, for example, by a user equipment, in accordance with various aspects of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0014]

[0020] Various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure may be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the 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 covers any aspect of the present disclosure disclosed herein, whether implemented independently of or in combination with other aspects of the present disclosure. For example, an apparatus may be implemented or a method may be practiced using any number of aspects described herein. Furthermore, the scope of the present disclosure is intended to cover such apparatus or methods implemented using other structure, functions, or structure and functions in addition to or other than the various aspects of the present disclosure described herein. It should be understood that any aspect of the present disclosure disclosed herein may be embodied by one or more elements of a claim.

[0015]

[0021] Several aspects of telecommunications systems are now presented with reference to various apparatus and techniques. These apparatus and techniques are described in the detailed description that follows and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the particular application and design constraints imposed on the overall system.

[0016]

[0022] It should be noted that although aspects may be described herein using terminology commonly associated with 3G and / or 4G wireless technologies, aspects of the present disclosure may be applied in other generation-based communication systems, such as 5G and beyond, including NR technologies.

[0017]

[0023] 1 illustrates a wireless network 100 in which aspects of the present disclosure may be implemented. Wireless network 100 may be an LTE network or some other wireless network, such as a 5G or NR network. Wireless network 100 may include several BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A BS is an entity that communicates with 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 reception point (TRP), etc. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" can refer to the coverage area of ​​a BS and / or a BS subsystem serving this coverage area, depending on the context in which the term is used.

[0018]

[0024] 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., a few 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 home) and may allow restricted access by UEs that have an association with the femto cell (e.g., a UE 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 the example shown in FIG. 1, BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102c. A BS may support one or more (e.g., three) cells. The terms “eNB,” “base station,” “NR BS,” “gNB,” “TRP,” “AP,” “Node B,” “5G NB,” and “cell” may be used interchangeably herein.

[0019]

[0025] In some aspects, the cells may not necessarily be fixed, and the geographic area of ​​the cells may move according to 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 wireless network 100 through various types of backhaul interfaces, such as direct physical connections, virtual networks, etc., using any suitable transport network.

[0020]

[0026] Wireless network 100 may also include relay stations. A relay station is an entity that can receive data transmissions from an upstream station (e.g., a BS or UE) and send the data transmissions to a downstream station (e.g., a UE or BS). A relay station may also be a UE that can relay transmissions for other UEs. In the example shown in FIG. 1, relay station 110d may communicate with BS 110a and UE 120d to facilitate communication between macro BS 110a and UE 120d. A relay station may also be called a relay BS, a relay base station, a relay, etc.

[0021]

[0027] 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 impacts on interference in wireless network 100. For example, macro BSs may have high transmit power levels (e.g., 5-40 watts), while pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1-2 watts).

[0022]

[0028] A network controller 130 may couple to a set of BSs and 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) via wireless or wireline backhaul.

[0023]

[0029] The UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be fixed or mobile. A UE may also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. A UE may be a cellular phone (e.g., a smartphone), 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 satellite radio), a vehicle component or sensor, a smart meter / sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate over a wireless or wired medium.

[0024]

[0030] Some UEs may be considered machine type communication (MTC) UEs or evolved or enhanced machine type communication (eMTC) UEs. MTC UEs and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc. that may communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide, for example, connectivity 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 Internet of Things (IoT) devices and / or implemented as NB-IoT (Narrowband Internet of Things) devices. Some UEs may be considered Customer Premises Equipment (CPE). The UE 120 may be included in a housing that stores components of the UE 120, such as processor components, memory components, etc.

[0025]

[0031] Generally, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a particular radio access technology (RAT) and may operate on one or more frequencies. A RAT may also be referred to as a radio technology, air interface, etc. A frequency may also be referred to as a 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.

[0026]

[0032] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly (e.g., without using a base station 110 as an intermediary for communicating with each other) using one or more sidelink channels. For example, the UEs 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (which may include, e.g., vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, vehicle-to-pedestrian (V2P) protocols, etc.), mesh networks, etc. In this case, the UEs 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by the base station 110.

[0027]

[0033] As noted above, Figure 1 is provided as an example. Other examples may differ from those described with respect to Figure 1.

[0028]

[0034] 2 shows a block diagram of a design 200 of a base station 110, which may be one of the base stations in FIG. 1, and a UE 120, which may be one of the UEs in FIG. 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.

[0029]

[0035] At base station 110, transmit processor 220 may receive data from data source 212 for one or more UEs, select one or more modulation and coding schemes (MCSs) 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 that UE, and provide data symbols for all UEs. Transmit processor 220 may also process system information and control information (e.g., for semi-static resource partitioning information (SRPI), etc.) and provide overhead and control symbols. Transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRSs)) and synchronization signals (e.g., primary synchronization signals (PSSs) and secondary synchronization signals (SSSs)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​the data symbols, control symbols, overhead symbols, and / or reference symbols, if applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a respective 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 upconvert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively. According to various aspects described in more detail below, synchronization signals may be generated using location coding to convey additional information.

[0030]

[0036] At UE 120, antennas 252a through 252r may receive downlink signals from base station 110 and / or other base stations and may provide received signals to demodulators (DEMODs) 254a through 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 through 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 and provide decoded data for UE 120 to a data sink 260 and may provide decoded control information and system information to 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), etc. In some aspects, one or more components of the UE 120 may be included in a housing.

[0031]

[0037] 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 comprising RSRP, RSSI, RSRQ, CQI, etc.). The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. At the base station 110, uplink signals from the UE 120 and other UEs may be received by antennas 234, processed by a demodulator 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 120. The receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0032]

[0038] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or any other component(s) of FIG. 2 may implement one or more techniques associated with using an enhanced DMRS scrambling identifier for demodulation reference signal (DMRS) communication, 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 any other component of FIG. 2 may perform or direct the operation of, for example, process 700 of FIG. 7 and / or other processes described herein. The memories 242 and 282 may store data and program codes for the base station 110 and the UE 120, respectively. In some aspects, the memory 242 and / or the memory 282 may comprise a non-transitory computer-readable medium that stores one or more instructions for wireless communication. For example, the one or more instructions, when executed by one or more processors at the base station 110 and / or the UE 120, may perform or direct operations of, for example, process 700 in FIG. 7 and / or other processes described herein. The scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0033]

[0039] In some aspects, the UE 120 may include, among other examples, means for receiving information from a base station (e.g., the BS 110) identifying the amount of DMRS sequences supported per antenna panel of the BS, or means for transmitting DMRS communications having one or more DMRS sequences configured based at least in part on the amount of DMRS sequences supported per antenna panel and scrambled using an enhanced DMRS scrambling identifier based at least in part on a physical random access channel preamble. In some aspects, such means may include one or more components of the UE 120 described in connection with FIG. 2, such as the controller / processor 280, the transmit processor 264, the TX MIMO processor 266, the MOD 254, the antennas 252, the DEMOD 254, the MIMO detector 256, and the receive processor 258.

[0034]

[0040] As noted above, Figure 2 is provided as an example. Other examples may differ from those described with respect to Figure 2.

[0035]

[0041] FIG. 3 is a diagram illustrating an example channel structure 300 for transmitting a Physical Random Access Channel (PRACH) message type A (msgA) in accordance with various aspects of the present disclosure.

[0036]

[0042] As shown in FIG. 3, the channel structure for transmitting PRACH msgA may include resources allocated for a preamble section (msgA preamble) and a payload section (msgA payload). The preamble section, which may include a cyclic prefix (CP), is used for PRACH transmission (T PRACH After the time resources allocated for PRACH transmission, the channel structure may include a guard period and / or gap period (T, T ... G,1 and T gap,2) as a PRACH msgA payload section. As shown, the msgA payload section may include a DMRS transmission multiplexed with a Physical Uplink Shared Channel (PUSCH) transmission, as described in more detail herein. The msgA payload section may include a guard period (T) to allow the UE to transition from transmitting a PRACH msgA to transmitting another communication or receiving a communication. G,2 ).

[0037]

[0043] As noted above, Figure 3 is provided as an example. Other examples may differ from those described with respect to Figure 3.

[0038]

[0044] FIG. 4 is a diagram illustrating an example resource mapping 400 for transmitting PRACH msgA, in accordance with various aspects of the present disclosure.

[0039]

[0045] As shown in Figure 4, the msgA transmission occasion may include time and frequency resources that map to a synchronization signal block (SSB) of a set of SSBs. The msgA transmission occasion may occur in an initial or active uplink bandwidth portion (BWP) and may include a random access channel (RACH) slot with a set of RACH occasions (ROs). Furthermore, the msgA transmission occasion may include one or more different types of PUSCH configurations, such as msgA PUSCH configuration #1 and msgA PUSCH configuration #2.

[0040]

[0046] In some aspects, the BS may configure a first set of two different transport block sizes (TBSs) for the msgA PUSCH in system information when the UE is in a radio resource control (RRC) idle state or an RRC inactive state. The first set of two different TBSs may be configured for transmission during the initial BWP. In contrast, the BS may configure a second set of two different TBSs for the msgA PUSCH when the UE is in an RRC connected state. In this case, the BS may configure the second set of TBSs in RRC signaling for the active bandwidth portion (e.g., which may be the same as or different from the initial bandwidth portion). Based at least in part on receiving information from the BS identifying the set of transport block sizes, the UE may select a particular TBS based at least in part on Layer 1 reference signal received power (RSRP) measurements, the contents of the msgA data buffer, satisfaction of a msgA group size parameter, etc.

[0041]

[0047] As noted above, Figure 4 is provided as an example. Other examples may differ from those described with respect to Figure 4.

[0042]

[0048] FIG. 5 is a diagram illustrating an example transmit chain 500 for transmitting PRACH msgA in accordance with various aspects of the present disclosure.

[0043]

[0049] 5, a UE, such as UE 120, may include a transmit chain for transmitting msgA. In this case, the UE may receive a payload and a cyclic redundancy check (CRC) in the transmit chain and may perform channel coding and rate matching on the payload and CRC to generate bits for transmission. After performing channel coding and rate matching, the UE may use a scrambling sequence to scramble the bits of the payload and CRC. For example, a bit scrambling module may use a scrambling sequence of the following form:

[0044]

number

[0045] where C init represents the initial value of the scrambling sequence, RA-RNTI is the Random Access (RA) Radio Network Temporary Identifier (RNTI), and n ID represents an initialization value based at least in part on a UE identifier.

[0046]

[0050] As further shown in FIG. 5, based on the scrambling of the bits, the UE may perform linear modulation and, in some cases, transform precoding, as described in more detail herein. After the linear modulation (and, in some cases, transform precoding), the UE may perform inverse fast Fourier transform (IFFT) processing. After the IFFT processing, the UE may multiplex the DMRS with the payload and CRC (e.g., symbols generated at least in part based on the bits). After multiplexing the DMRS with the payload and CRC, the UE may perform radio resource mapping to generate a msgA preamble based at least in part on the PRACH preamble, and a msgA payload based at least in part on the payload and CRC and the DMRS.

[0047]

[0051] The UE may use the DMRS scrambling identifier to generate a DMRS for multiplexing with the content of msgA. The UE may determine the DMRS scrambling identifier based at least in part on the waveform of msgA's corresponding physical uplink shared channel (PUSCH). In a contention-based random access (CBRA)-based two-step random access channel (RACH) procedure, using a DMRS scrambling identifier based at least in part on a PUSCH waveform (e.g., a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) waveform or a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform) may result in collisions between different DMRSs. This may result in interrupted communication, reduced throughput, etc.

[0048]

[0052] Thus, certain aspects described herein enable a UE to use, for a DMRS, an extended DMRS scrambling identifier that is determined based at least in part on a scrambling identifier for a msgA PUSCH that is to be multiplexed with the DMRS. For example, the UE may determine the extended DMRS scrambling identifier based at least in part on a PRACH preamble, as shown. In this manner, by reusing the PRACH preamble to determine the extended DMRS scrambling identifier, the UE reduces the likelihood of collisions along with increased processing and / or memory utilization associated with using other types of dedicated DMRS scrambling identifiers for various waveforms.

[0049]

[0053] In some aspects, the UE may determine an extended DMRS scrambling identifier based at least in part on the amount of DMRS sequences supported per antenna panel of the BS. In some aspects, the UE may determine the extended DMRS scrambling identifier and map a PRACH preamble to a PUSCH resource unit (PRU) to perform a DMRS generation procedure. In this manner, the UE may generate an extended DMRS scrambling identifier that reduces the likelihood of collisions during a CBRA-based two-step RACH.

[0050]

[0054] As noted above, Figure 5 is provided as an example. Other examples may differ from those described with respect to Figure 5.

[0051]

[0055] 6 illustrates an example 600 of using an extended DMRS scrambling identifier for DMRS communication in accordance with various aspects of the present disclosure. As shown in FIG. 6, the example 600 includes a BS 110 in communication with a UE 120.

[0052]

[0056] As further indicated in FIG. 6 and by reference numeral 610, UE 120 may receive information identifying the amount of DMRS sequences supported per antenna panel of BS 110. For example, BS 110 may transmit information identifying the amount of DMRS sequences supported per antenna panel to a group of UEs 120 that includes the UE. In some aspects, UE 120 may receive DMRS sequence configuration information from BS 110 based at least in part on BS 110 configuring one or more DMRS sequences for DMRS communication (e.g., by using the “msgA-ScramblingID0” or “msgA-ScramblingID1” parameters or by configuring one or more additional DMRS positions, among other examples). In this case, BS 110 may configure one or more DMRS sequences based at least in part on the amount of DMRS sequences supported per antenna panel. In some aspects, UE 120 may receive information indicating that BS 110 supports four DMRS sequences per antenna panel, eight DMRS sequences per antenna panel, etc. In this case, the amount of DMRS sequences may correspond to the amount of DMRS scrambling identifiers (e.g., extended DMRS scrambling identifiers) supported per antenna panel. In some aspects, the BS 110 may configure extended DMRS scrambling identifiers per antenna port and provide system information or RRC signaling to the UE 120 to identify the configured extended DMRS scrambling identifiers.

[0053]

[0057] As further indicated in FIG. 6 and by reference numeral 620, the UE 120 may configure one or more DMRS sequences for DMRS communication. For example, the UE 120 may configure one or more DMRS sequences based at least in part on the amount of DMRS sequences supported per antenna panel. Additionally or alternatively, the UE 120 may configure one or more DMRS sequences based at least in part on a PRACH preamble. For example, the UE 120 may scramble one or more DMRS sequences using an extended DMRS scrambling identifier based at least in part on the PRACH preamble. In this manner, the UE 120 may reuse the scrambling identifier of the msgA PUSCH to be transmitted with the DMRS communication, as described above. In some aspects, the UE 120 may map the PRACH preamble to a PRU to reuse the scrambling identifier of the msgA PUSCH for the extended DMRS scrambling identifier.

[0054]

[0058] In this case, UE 120 may support one or more different possible mapping ratios. For example, UE 120 may determine the mapping ratio based at least in part on the amount of PRACH sequences allocated for msgA preambles on valid RACH occasions (ROs) and the amount of PRUs allocated for msgA payloads on valid PUSCH occasions (POs). In some aspects, UE 120 may determine the mapping ratio based at least in part on a received broadcast (e.g., of system information) from BS 110 or via RRC signaling from BS 110. Additionally or alternatively, after confirmation of the msgA resource occasions and msgA ROs and msgA POs for the two-step RACH, UE 120 may determine the mapping ratio based at least in part on a confirmation rule and mapping order (e.g., received from BS 110). In some aspects, each msgA PUSCH configuration in the initial or active bandwidth portion may be associated with a single mapping ratio, and different msgA PUSCH configurations may have different mapping ratios. The mapping ratio may be valid for at least the mapping period between the msgA RO and the msgA PUSCH PO, where the mapping period may be a common multiple of the SSB-RO association pattern periods for each msgA PUSCH configuration.

[0055]

[0059] In some aspects, the UE 120 may generate a DMRS communication using a particular DMRS pattern. For example, the UE 120 may generate a Type I DMRS pattern-based DMRS, a Type II DMRS pattern-based DMRS, etc.

[0056]

[0060] In some aspects, the UE 120 may determine the extended DMRS scrambling identifier based at least in part on the type of waveform for the transmission including the msgA PUSCH and DMRS communication. For example, for a CP-OFDM waveform and when transform precoding is not enabled, the UE 120 may determine the extended DMRS scrambling identifier based at least in part on an equation of the following form:

[0057]

number

[0058] In this case, UE 120 reuses the bit scrambling sequence applied to the payload and CRC of msgA, as described above. Additionally or alternatively, UE 120 may determine the extended DMRS scrambling identifier based at least in part on an equation of the following form:

[0059]

number

[0060] where l is the OFDM symbol number in the slot, and n s,f μ where k is the slot number within the frame, and <·> is an inner quantity operator (e.g., truncating the inner quantity to K most significant bits (MSBs) or least significant bits (LSBs)). In this case, UE 120 determines the extended DMRS scrambling identifier based at least in part on the bit scrambling sequence, the symbol number for the DMRS, the slot number for the DMRS, etc.

[0061] Additionally or alternatively, when the waveform is a DFT-s-OFDM waveform and transform precoding is enabled, the UE 120 may determine an extended DMRS scrambling identifier for group hopping and sequence hopping as follows:

[0062]

number

[0063] In this case, the UE 120

[0064]

number

[0065] may be determined as follows:

[0066] [Number]

[0067] Additionally or alternatively, the UE 120 may:

[0068]

number

[0069] may be determined as follows:

[0070]

number

[0071] In this case, support for a CP-OFDM waveform or a DFT-s-OFDM waveform may correspond to UE 120 determining whether to apply transform precoding for PUSCH transmissions, as described above (e.g., using CP-OFDM may correspond to not using transform precoding, and using DFT-s-OFDM may correspond to using transform precoding).

[0072] 6 and further indicated by reference numeral 630, UE 120 may transmit a DMRS communication. For example, based at least in part on configuring a DMRS sequence using the extended DMRS scrambling identifier, UE 120 may transmit a DMRS multiplexed with the msgA PUSCH. In this manner, BS 110 and UE 120 reduce the likelihood of collisions between DMRSs in a CBRA-based two-step RACH.

[0073]

[0063] As noted above, Figure 6 is provided as an example. Other examples may differ from those described with respect to Figure 6.

[0074] 7 illustrates an example process 700, performed, for example, by a UE, in accordance with various aspects of the present disclosure. The example process 700 is an example in which a UE (such as, for example, UE 120) performs operations associated with using an extended demodulation reference signal scrambling identifier for demodulation reference signal communication.

[0075] 7, in some aspects, process 700 may include receiving information from a BS identifying a quantity of DMRS sequences supported per antenna panel of the BS (block 710). For example, a UE (e.g., using antennas 252, DEMOD 254, MIMO detector 256, receive processor 258, or controller / processor 280, among other examples) may receive information from the BS identifying a quantity of DMRS sequences supported per antenna panel of the BS, as described above.

[0076] 7, in some aspects, process 700 may include transmitting a DMRS communication with one or more DMRS sequences configured based at least in part on the quantity of DMRS sequences supported per antenna panel and scrambled using an extended DMRS scrambling identifier based at least in part on a physical random access channel preamble (block 720). For example, a UE (e.g., using controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, or antenna 252, among other examples) may transmit a DMRS communication with one or more DMRS sequences configured based at least in part on the quantity of DMRS sequences supported per antenna panel and scrambled using an extended DMRS scrambling identifier based at least in part on a physical random access channel preamble, as described above.

[0077]

[0067] Process 700 may include additional aspects, such as any single aspect or any combination of aspects, described below and / or in connection with one or more other processes described elsewhere in this specification.

[0078]

[0068] In a first aspect, the process 700 includes configuring one or more DMRS sequences, where configuring the one or more DMRS sequences includes generating a waveform for DMRS communication, where the waveform for DMRS communication is a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform or a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) waveform.

[0079] In a second aspect, alone or in combination with the first aspect, the amount of DMRS sequences supported per antenna panel is four or eight.

[0080]

[0070] In a third aspect, alone or in combination with one or more of the first and second aspects, the DMRS pattern of the one or more DMRS sequences is a Type I DMRS pattern or a Type II DMRS pattern.

[0081]

[0071] In a fourth aspect, alone or in combination with one or more of the first to third aspects, configuring one or more DMRS sequences includes mapping a physical random access channel preamble to a physical uplink shared channel resource unit including one or more DMRS sequences in relation to a mapping ratio within a mapping period between the preamble and the PUSCH resource unit.

[0082] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, DMRS communication is associated with a physical uplink shared channel with transform precoding.

[0083] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, DMRS communication is associated with a physical uplink shared channel without transform precoding.

[0084]

[0074] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the extended DMRS scrambling identifier is based at least in part on a physical uplink shared channel scrambling identifier of a physical random access channel message associated with a physical random access channel preamble.

[0085]

[0075] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, an extended DMRS scrambling identifier is configured per antenna port via system information or radio resource control transmission.

[0086]

[0076] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the process 700 may include determining the mapping ratio based at least in part on at least one of a received system information transmission from the BS, a received radio resource control transmission from the BS, a set of confirmation rules, or a mapping order.

[0087]

[0077] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, a mapping ratio is defined for a PUSCH configuration in an initial or active bandwidth portion such that each PUSCH configuration of a plurality of PUSCH configurations is associated with a single mapping ratio.

[0088]

[0078] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, a first PUSCH configuration of a plurality of PUSCH configurations is associated with a different mapping ratio than a second PUSCH configuration of the plurality of PUSCH configurations.

[0089]

[0079] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the mapping period is based at least in part on a synchronization signal block-resource occasion association pattern period.

[0090]

[0080] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the process 700 may include configuring one or more DMRS sequences for DMRS communication based at least in part on the amount of DMRS sequences supported per antenna panel and the physical random access channel preamble, and transmitting the DMRS communication may include transmitting the DMRS communication based at least in part on configuring one or more DMRS sequences for the DMRS communication.

[0091]

[0081] Although Figure 7 illustrates example blocks of process 700, in some aspects process 700 may include additional, fewer, different, or differently configured blocks than those shown in Figure 7. Additionally or alternatively, two or more of the blocks of process 700 may be performed in parallel.

[0092] The above disclosure provides illustration and description, and is not intended to be exhaustive or to limit the embodiments to the precise form disclosed. Modifications and variations may be made in light of the above disclosure or acquired from practice of the embodiments.

[0093]

[0083] As used herein, the term "component" shall 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.

[0094]

[0084] As used herein, satisfying a threshold may refer, depending on the context, to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, etc.

[0095] It will be apparent that the systems and / or methods described herein may be implemented in different forms of hardware, firmware, and / or combinations of hardware and software. The actual specialized control hardware or software code used to implement these systems and / or methods is not a limiting aspect. Thus, the operation and behavior of the systems and / or methods are described herein without reference to specific software code, and it will be understood that software and hardware can be designed to implement the systems and / or methods based at least in part on the description herein.

[0096] Although particular combinations of features are recited in the claims and / or disclosed herein, these combinations do not limit the disclosure of various aspects. Indeed, many of these features may be combined in ways not specifically recited in the claims and / or disclosed herein. While each dependent claim set forth below may depend directly on only one claim, the disclosure of various aspects includes each dependent claim in combination with every other claim in the claims. A phrase referring to "at least one of" a list of items refers to any combination of those items, including single members. As an example, "at least one of a, b, or c" is intended to include a, b, c, ab, ac, bc, and abc, as well as any combination with multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other order of a, b, and c).

[0097]

[0087] As used herein, no element, act, or instruction should be construed as critical or required unless explicitly described as such. Also, as used herein, the articles "a" and "an" include one or more items and may be used interchangeably with "one or more." Furthermore, as used herein, the terms "set" and "group" include one or more items (e.g., related items, unrelated items, combinations of related and unrelated items, etc.) and may be used interchangeably with "one or more." Where only one item is intended, the phrase "only one" or similar language is used. Also, as used herein, terms such as "has," "have," and "having" are intended to be open-ended terms. Furthermore, the phrase "based on" is intended to mean "based at least in part on," unless expressly specified otherwise.

Claims

1. 1. A method of wireless communication implemented by a user equipment (UE), comprising: receiving information from a base station (BS) identifying a quantity of demodulation reference signal (DMRS) sequences supported per antenna panel of the BS; transmitting a DMRS communication with one or more DMRS sequences configured based at least in part on the quantity of DMRS sequences supported per antenna panel and scrambled using an extended DMRS scrambling identifier based at least in part on a physical random access channel preamble.

2. configuring the one or more DMRS sequences for the DMRS communication based at least in part on the quantity of DMRS sequences supported per antenna panel and the physical random access channel preamble; wherein transmitting the DMRS communication comprises:

10. The method of claim 1, comprising transmitting the DMRS communication based at least in part on configuring the one or more DMRS sequences for the DMRS communication.

3. Configuring the one or more DMRS sequences includes: generating a waveform for the DMRS communication; 3. The method of claim 2, wherein the waveform for the DMRS communication is a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform or a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) waveform.

4. 2. The method of claim 1, wherein the amount of DMRS sequences supported per antenna panel is four or eight.

5. The method of claim 1 , wherein the DMRS pattern of the one or more DMRS sequences is a Type I DMRS pattern or a Type II DMRS pattern.

6. 2. The method of claim 1, wherein the extended DMRS scrambling identifier is configured per antenna port via system information or radio resource control transmission.

7. 2. The method of claim 1, further comprising: mapping the physical random access channel preamble to a physical uplink shared channel (PUSCH) resource unit including the one or more DMRS sequences with respect to a mapping ratio within a mapping period between the preamble and a PUSCH resource unit.

8. The mapping ratio is received system information transmissions from the BS; a received radio resource control transmission from the BS; a set of checking rules, or The method of claim 7 , further comprising determining based at least in part on at least one of the mapping orders.

9. 8. The method of claim 7, wherein the mapping ratios are defined for PUSCH configurations in an initial or active bandwidth portion such that each PUSCH configuration of a plurality of PUSCH configurations is associated with a single mapping ratio.

10. 10. The method of claim 9, wherein a first PUSCH configuration of the plurality of PUSCH configurations is associated with a different mapping ratio than a second PUSCH configuration of the plurality of PUSCH configurations.

11. 8. The method of claim 7, wherein the mapping period is based at least in part on a synchronization signal block-random access channel occasion association pattern period.

12. 2. The method of claim 1, wherein the DMRS communication is associated with a physical uplink shared channel with transform precoding.

13. 2. The method of claim 1, wherein the DMRS communication is associated with a physical uplink shared channel without transform precoding.

14. 2. The method of claim 1, wherein the enhanced DMRS scrambling identifier is based at least in part on a physical uplink shared channel (PUSCH) scrambling identifier of a physical random access channel message associated with the physical random access channel preamble.

15. 1. A user equipment (UE) for wireless communications, comprising: Memory and and one or more processors coupled to the memory, wherein the memory and the one or more processors: receiving information from a base station (BS) identifying a quantity of demodulation reference signal (DMRS) sequences supported per antenna panel of the BS; and transmitting a DMRS communication having one or more DMRS sequences configured based at least in part on the quantity of DMRS sequences supported per antenna panel and scrambled using an extended DMRS scrambling identifier based at least in part on a physical random access channel preamble.

16. the one or more processors: and further configured to configure the one or more DMRS sequences for the DMRS communication based at least in part on the quantity of DMRS sequences supported per antenna panel and the physical random access channel preamble. wherein, when the one or more processors transmit the DMRS communication, 16. The UE of claim 15, configured to transmit the DMRS communication based at least in part on configuring the one or more DMRS sequences for the DMRS communication.

17. When the one or more processors configure the one or more DMRS sequences, generating a waveform for the DMRS communication; 17. The UE of claim 16, wherein the waveform for the DMRS communication is a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform or a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) waveform.

18. 16. The UE of claim 15, wherein the amount of DMRS sequences supported per antenna panel is four or eight.

19. The UE of claim 15 , wherein a DMRS pattern of the one or more DMRS sequences is a Type I DMRS pattern or a Type II DMRS pattern.

20. 16. The UE of claim 15, wherein the extended DMRS scrambling identifier is configured per antenna port via system information or radio resource control transmission.

21. the one or more processors:

16. The UE of claim 15, further configured to: map the physical random access channel preamble to a physical uplink shared channel (PUSCH) resource unit including the one or more DMRS sequences in relation to a mapping ratio within a mapping period between the preamble and a PUSCH resource unit.

22. the one or more processors: The mapping ratio is received system information transmissions from the BS; a received radio resource control transmission from the BS; a set of checking rules, or 22. The UE of claim 21, further configured to make a decision based at least in part on at least one of the mapping orders.

23. 22. The UE of claim 21, wherein the mapping ratios are defined for PUSCH configurations in an initial or active bandwidth portion such that each PUSCH configuration of a plurality of PUSCH configurations is associated with a single mapping ratio.

24. 24. The UE of claim 23, wherein a first PUSCH configuration of the plurality of PUSCH configurations is associated with a different mapping ratio than a second PUSCH configuration of the plurality of PUSCH configurations.

25. 22. The UE of claim 21, wherein the mapping period is based at least in part on a synchronization signal block-random access channel occasion association pattern period.

26. 16. The UE of claim 15, wherein the DMRS communication is associated with a physical uplink shared channel with transform precoding.

27. 16. The UE of claim 15, wherein the DMRS communication is associated with a physical uplink shared channel without transform precoding.

28. 16. The UE of claim 15, wherein the enhanced DMRS scrambling identifier is based at least in part on a physical uplink shared channel (PUSCH) scrambling identifier of a physical random access channel message associated with the physical random access channel preamble.

29. 1. A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising: When executed by one or more processors of a user equipment (UE), the one or more processors: receiving information from a base station (BS) identifying a quantity of demodulation reference signal (DMRS) sequences supported per antenna panel of the BS; and transmitting a DMRS communication having one or more DMRS sequences configured based at least in part on the quantity of DMRS sequences supported per antenna panel and scrambled using an extended DMRS scrambling identifier based at least in part on a physical random access channel preamble.

30. means for receiving, from a base station (BS), information identifying a quantity of demodulation reference signal (DMRS) sequences supported per antenna panel of said BS; and means for transmitting a DMRS communication having one or more DMRS sequences configured based at least in part on the quantity of DMRS sequences supported per antenna panel and scrambled using an extended DMRS scrambling identifier based at least in part on a physical random access channel preamble.

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