Extended Demodulation Reference Signal Scrambling Identifier for Demodulation Reference Signal Communication

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may receive information from a base station (BS) identifying a quantity of demodulation reference signal (DMRS) sequences supported per antenna panel of the BS. The UE may transmit 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. Numerous other aspects are provided.

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 on 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 on November 11, 2020, entitled "EXTENDED DEMODULATION REFERENCE SIGNAL SCRAMBLING IDENTIFIER FOR DEMODULATION REFERENCE SIGNAL COMMUNICATION", which are hereby incorporated by reference in their entirety.

[0002]

[0002] Aspects of the present disclosure generally relate to techniques and apparatus for extended demodulation reference signal (DMRS) scrambling identifiers for wireless communication and for DMRS communication in grant - free uplink transmission.

Background Art

[0003]

[0003] Wireless communication systems are widely deployed to provide various telecommunications services such as telephony, video, data, messaging, and broadcast. A typical wireless communication system may employ a multiple access technology that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems, and Long Term Evolution (LTE (R)). LTE / LTE-Advanced is a set of extensions to the Universal Mobile Telecommunications System (UMTS) mobile standard published by the 3rd Generation Partnership Project (3GPP (R)).

[0004]

[0004] A wireless communication network may include several base stations (BSs) that can support communication for several user equipments (UEs). The user equipment (UE) may communicate with the base station (BS) via the downlink and the 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, the BS may be referred to as Node B, gNB, access point (AP), radio head, transmit receive point (TRP), New Radio (NR) BS, 5G Node B, etc.

[0005]

[0005] The above-described multi-connectivity technology is adopted in various telecommunication standards to provide a common protocol that enables different user devices to communicate on a city, national, regional, and even global scale. New Radio (NR), sometimes referred to as 5G, is a set of extensions to the LTE mobile standard published by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by improving spectral efficiency, reducing costs, improving services, utilizing new spectra, and using Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) (CP-OFDM) on the downlink (DL) and CP-OFDM and / or Single Carrier - Frequency Division Multiplexing (SC-FDM) (also known as Discrete Fourier Transform Spread OFDM (DFT-s-OFDM)) on the uplink (UL), better integrating with other open standards, and supporting beamforming, Multiple-Input Multiple-Output (MIMO) antenna technology, and carrier aggregation. However, as the demand for mobile broadband access continues to increase, further improvements to LTE and NR technologies are needed. Preferably, these improvements should be applicable to other multi-connectivity technologies and the telecommunication standards that adopt these technologies.

Summary of the Invention

[0006]

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

[0007]

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

[0009]

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

[0010] Aspect generally includes a method, an apparatus, a system, a computer program product, a non-transitory computer-readable medium, a user equipment, a base station, a wireless communication device, and / or a processing system, as substantially described herein with reference to the accompanying drawings and as shown by the accompanying drawings and the specification.

[0011] The foregoing has outlined rather broadly the features and technical advantages of examples according to the present disclosure so that the following description of the invention may be better understood. Additional features and advantages will be described hereinafter. The disclosed concepts and specific examples 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 characteristics 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 connection with the accompanying drawings. Each of the drawings is provided for the purpose of illustration and description and is not provided as a definition of the limits of the claims.

[0012] To better understand the features recited above in the present disclosure, a more specific description briefly summarized above can be obtained by referring to aspects, some of which are shown in the accompanying drawings. However, it should be noted that since the description may lead to other equally effective aspects, the accompanying drawings show only some exemplary aspects of the present disclosure and thus should not be regarded as limiting the scope of the present disclosure. The same reference numbers in different drawings may identify the same or similar elements.

Brief Description of the Drawings

[0013]

Figure 1

[0013] A block diagram conceptually showing an example of a wireless communication network according to various aspects of the present disclosure.

Figure 2

[0014] A block diagram conceptually showing an example of a base station communicating with a UE in a wireless communication network according to various aspects of the present disclosure.

Figure 3

[0015] A diagram showing an example of a channel structure for transmitting a Physical Random Access Channel (PRACH) Message Type A (msgA) according to various aspects of the present disclosure.

Figure 4

[0016] A diagram showing an example of resource mapping for transmitting a PRACH msgA according to various aspects of the present disclosure.

Figure 5

[0017] A diagram showing an example of a transmission chain for transmitting a PRACH msgA according to various aspects of the present disclosure.

Figure 6

[0018] A diagram showing an example of using an extended DMRS scrambling identifier for DMRS communication according to various aspects of the present disclosure.

Figure 7

[0019] A diagram showing an exemplary process implemented, for example, by a user equipment according to various aspects of the present disclosure.

DETAILED DESCRIPTION OF THE INVENTION

[0014]

[0020] Various aspects of the present disclosure will be described in more detail below with reference to the accompanying drawings. It should be noted, however, that the present disclosure can be implemented in many different forms and should not be construed as limited to any particular structure or function presented throughout the present 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 should understand that the scope of the present disclosure covers any aspect of the present disclosure disclosed herein, whether implemented independently of other aspects of the present disclosure or in combination with other aspects of the present disclosure. For example, an apparatus can be implemented or a method can be carried out using any number of the aspects described herein. Further, the scope of the present disclosure is intended to cover such apparatus or methods implemented using other structures, functions, or a combination of structures 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 can be implemented by one or more elements of the claims.

[0015]

[0021] Next, some aspects of a telecommunications system are presented with reference to various devices and techniques. These devices and techniques are described in the context of embodiments for carrying out the following inventions and are shown in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the particular application and the design constraints imposed on the overall system.

[0016]

[0022] Although aspects may be described herein using terms generally associated with 3G and / or 4G wireless technologies, it should be noted that aspects of the present disclosure can be applied in other generation-based communication systems, such as those after 5G, including NR technology.

[0017]

[0023] FIG. 1 is a diagram showing a wireless network 100 in which aspects of the present disclosure may be implemented. The wireless network 100 can be any other wireless network, such as an LTE network, or a 5G or NR network. The wireless network 100 can include several BSs 110 (shown as BS110a, BS110b, BS110c, and BS110d) and other network entities. A BS is an entity that communicates with user equipment (UE) and may be referred to as a base station, NR BS, Node B, gNB, 5G Node B (NB), access point, transmission and reception point (TRP), etc. Each BS can provide communication coverage in a specific geographical area. In 3GPP, the term "cell" can refer to the coverage area of the BS and / or BS subsystem serving this coverage area, depending on the context in which the term is used.

[0018]

[0024] A BS may provide communication coverage to macro cells, pico cells, femto cells, and / or another type of cell. A macro cell may cover a relatively large geographical area (e.g., several kilometers in radius) and may enable unrestricted access by UEs subscribed to the service. A pico cell may cover a relatively small geographical area and may enable unrestricted access by UEs subscribed to the service. A femto cell may cover a relatively small geographical area (e.g., a home) and may enable restricted access by UEs associated with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG)). A BS for a macro cell may sometimes be called a macro BS. A BS for a pico cell may sometimes be called a pico BS. A BS for a femto cell may sometimes be called a femto BS or a home BS. In the example shown in FIG. 1, BS110a may be a macro BS for macro cell 102a, BS110b may be a pico BS for pico cell 102b, and BS110c 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, a cell may not necessarily be fixed, and the geographical area of a cell may move according to the location of a mobile BS. In some aspects, BSs may be interconnected with each other and / or with one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces such as direct physical connections, virtual networks, using any suitable transport network.

[0020]

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

[0021]

[0027] Wireless network 100 can be a heterogeneous network that includes different types of BSs, such as macro BSs, pico BSs, femto BSs, relay BSs, etc. These different types of BSs can have different transmission power levels, different coverage areas, and different impacts on interference in wireless network 100. For example, a macro BS can have a high transmission power level (e.g., 5 to 40 watts), while pico BSs, femto BSs, and relay BSs can have lower transmission power levels (e.g., 0.1 to 2 watts).

[0022]

[0028] Network controller 130 can be coupled to a set of BSs and can coordinate and control these BSs. Network controller 130 can communicate with the BSs via a backhaul. The BSs can also communicate with each other (directly or indirectly) via a wireless or wireline backhaul.

[0023]

[0029] UE 120 (e.g., 120a, 120b, 120c) can be distributed throughout the wireless network 100, and each UE can be fixed or mobile. The UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, etc. The UE can 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 instrument, a biosensor / biodevice, a wearable device (smartwatch, smart clothing, smart glasses, smart list band, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music device or a video device, or satellite radio), a vehicle component or vehicle sensor, a smart meter / smart sensor, an industrial manufacturing device, a global positioning system device, or any other suitable device configured to communicate via a wireless medium or a wired medium.

[0024]

[0030] Some UEs may be regarded as machine type communication (MTC) UEs or enhanced or extended machine type communication (eMTC) UEs. MTC UEs and eMTC UEs can communicate with, for example, a base station, another device (such as a remote device), or some other entity, including robots, drones, remote devices, sensors, meters, monitors, location tags, etc. A wireless node can provide connectivity for a network (such as a wide area network like the Internet or a cellular network) or to the network, for example, via a wired or wireless communication link. Some UEs may be regarded as Internet of Things (IoT) devices and / or may be implemented as narrowband Internet of Things (NB-IoT) devices. Some UEs may be regarded as customer premises equipment (CPE). UE120 may be included within a housing that stores components of UE120, such as a processor component, a memory component, etc.

[0025]

[0031] Generally, any number of wireless networks can be deployed within a given geographical area. Each wireless network may support a particular radio access technology (RAT) and may operate on one or more frequencies. RAT may also be referred to as a wireless technology, an air interface, etc. A frequency may also be referred to as a carrier, a frequency channel, etc. Each frequency may support a single RAT within a given geographical area to avoid interference between wireless networks of different RATs. In some cases, an NR or 5G RAT network may be deployed.

[0026]

[0032] In some aspects, two or more UEs 120 (such as those shown as UE120a and UE120e) can communicate directly using one or more sidelink channels (such as without using the base station 110 as a medium for communicating with each other). For example, the UE 120 can communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (which can include, for example, vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, vehicle-to-pedestrian (V2P) protocols, etc.), a mesh network, and the like. In this case, the UE 120 can perform scheduling operations, resource selection operations, and / or other operations described elsewhere in this specification as being performed by the base station 110.

[0027]

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

[0028]

[0034] FIG. 2 shows a block diagram of a design 200 of a base station 110 that can be one of the base stations in FIG. 1 and a UE 120 that can be one of the UEs in FIG. 1. The base station 110 can be equipped with T antennas 234a - 234t, and the UE 120 can be equipped with R antennas 252a - 252r, where generally T≥1 and R≥1.

[0029]

[0035] At base station 110, a transmission processor 220 receives data from a data source 212 for one or more UEs, selects one or more modulation and coding schemes (MCSs) for each UE based at least in part on channel quality indicators (CQIs) received from the UE, processes (e.g., encodes and modulates) the data for each UE based at least in part on the MCS selected for that UE, and may provide data symbols for all UEs. The transmission processor 220 may also process system information and control information (e.g., CQI requests, grants, upper layer signaling, etc.) (for, e.g., semi-static resource partitioning information (SRPI)) and provide overhead symbols and control symbols. The transmission 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)). A 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-232t. Each modulator 232 may process its respective output symbol stream (for, e.g., OFDM) to obtain an output sample stream. Each modulator 232 may further process the output sample stream (e.g., convert to analog, amplify, filter, and upconvert) to obtain a downlink signal. The T downlink signals from modulators 232a-232t may be transmitted via T antennas 234a-234t, respectively. According to various aspects described in more detail below, the synchronization signals may be generated using location coding to convey additional information.

[0030]

[0036] In UE120, antennas 252a to 252r can receive downlink signals from base station 110 and / or other base stations and can provide the received signals to respective demodulators (DEMOD) 254a to 254r. Each demodulator 254 can condition (e.g., filter, amplify, down-convert, and digitize) the received signal to obtain input samples. Each demodulator 254 can further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. The MIMO detector 256 can obtain received symbols from all R demodulators 254a to 254r and, when applicable, perform MIMO detection on the received symbols and provide the detected symbols. The receive processor 258 can process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE120 to data sink 260, and provide decoded control information and system information to controller / processor 280. The channel processor can determine, for example, reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of UE120 can be included within a housing.

[0031]

[0037] On the uplink, in UE 120, a transmission processor 264 may receive and process data from a data source 262 and control information (for example, for reports including RSRP, RSSI, RSRQ, CQI, etc.) from a controller / processor 280. The transmission processor 264 may also generate reference symbols for one or more reference signals. Symbols from the transmission processor 264 may be precoded by a TX MIMO processor 266, if applicable, and further processed by modulators 254a - 254r (for example, for DFT-s-OFDM, CP-OFDM, etc.) and transmitted to the base station 110. At the base station 110, uplink signals from UE 120 and other UEs are received by an antenna 234, processed by a demodulator 232, detected by a MIMO detector 236, if applicable, and further processed by a reception processor 238 to obtain the decoded data and control information sent by UE 120. The reception processor 238 may provide the decoded data to a data sink 239 and the decoded control information to a controller / processor 240. The base station 110 includes a communication unit 244 and may communicate with a 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 extended DMRS scrambling identifier for demodulation reference signal (DMRS) communication, as described in more detail elsewhere in this specification. For example, 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 perform or direct the operations of, for example, process 700 of FIG. 7 and / or other processes described herein. Memories 242 and 282 may store data and program code for the base station 110 and the UE 120, respectively. In some aspects, memory 242 and / or memory 282 may comprise a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, the one or more instructions, when executed by one or more processors of the base station 110 and / or the UE 120, may perform or direct the operations of, for example, process 700 of FIG. 7 and / or other processes described herein. The scheduler 246 may schedule the UE for data transmission on the downlink and / or the uplink.

[0033]

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

[0034]

[0040] As described above, FIG. 2 is provided as an example. Other examples may differ from those described in connection with FIG. 2.

[0035]

[0041] FIG. 3 is a diagram illustrating an example 300 of a channel structure for transmitting a physical random access channel (PRACH) message type A (msgA) according to various aspects of the present disclosure.

[0036]

[0042] As shown in FIG. 3, the channel structure for transmitting a 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 within the time and frequency resources allocated for a PRACH transmission (T PRACH ). After the time resources allocated for the PRACH transmission, the channel structure includes a guard period and / or a gap period (T G,1 and T gap,2 respectively) to enable the transmission chain to transition from the msgA preamble transmission to the msgA payload transmission.) may include time and frequency resources allocated as such. As shown, the msgA payload section may include DMRS transmissions multiplexed with physical uplink shared channel (PUSCH) transmissions, as described in more detail herein. The msgA payload section includes a guard period (T G,2 ) to enable the UE to transition from transmitting a PRACH msgA to transmitting another communication or receiving a communication.

[0037]

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

[0038]

[0044] FIG. 4 is a diagram showing an example 400 of resource mapping for transmitting a PRACH msgA according to various aspects of the present disclosure.

[0039]

[0045] As shown in FIG. 4, the msgA transmission occasion may include time and frequency resources that map to an SSB among a set of synchronization signal blocks (SSBs). The msgA transmission occasion may occur in an initial or active uplink bandwidth part (BWP) and may include a random access channel (RACH) slot having a set of RACH occasions (ROs). Further, 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 the system information when the UE is in the radio resource control (RRC) idle state or RRC inactive state. The first set of two different TBSs may be configured for transmission in 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 the RRC connected state. In this case, the BS may configure the second set of TBSs in the RRC signaling for the active bandwidth part (which may be the same as or different from, for example, the initial bandwidth part). Based at least in part on receiving information identifying the set of transport block sizes from the BS, the UE may select a particular TBS based at least in part on, for example, layer 1 reference signal received power (RSRP) measurements, the content of the msgA data buffer, satisfaction of the msgA group size parameter, etc.

[0041]

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

[0042]

[0048] FIG. 5 is a diagram showing an example 500 of a transmission chain for transmitting a PRACH msgA according to various aspects of the present disclosure.

[0043]

[0049] As shown in FIG. 5, a UE, such as UE120, may include a transmission chain for transmitting msgA. In this case, the UE may receive a payload and a cyclic redundancy check (CRC) in the transmission 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, the bit scrambling module may use a scrambling sequence in the following form.

[0044]

Number

[0045] Here, 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 the UE identifier.

[0046]

[0050] As further shown in FIG. 5, based on scrambling the bits, the UE may perform linear modulation and, in some cases, conversion precoding as described in more detail herein. After linear modulation (and, in some cases, conversion 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 based at least in part on its 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, as well as a msgA payload based at least in part on the payload and CRC and DMRS.

[0047]

[0051] The UE may generate DMRS for multiplexing with the content of msgA using a DMRS scrambling identifier. The UE may determine the DMRS scrambling identifier based at least in part on the waveform of the corresponding Physical Uplink Shared Channel (PUSCH) of msgA. In a contention-based random access (CBRA)-based two-step random access channel (RACH) procedure, using the DMRS scrambling identifier based at least in part on the 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 cause collisions between different DMRSs. This may result in interrupted communication, reduced throughput, etc.

[0048]

[0052] Accordingly, some aspects described herein enable the UE to use an extended DMRS scrambling identifier that is determined based at least in part on a scrambling identifier for the msgA PUSCH to be multiplexed with the DMRS for the DMRS. For example, the UE may determine the extended DMRS scrambling identifier based at least in part on the PRACH preamble, as shown. By reusing the PRACH preamble to determine the extended DMRS scrambling identifier in this way, the UE reduces the likelihood of collisions along with the increased processing and / or memory utilization associated with using other types of dedicated DMRS scrambling identifiers for different 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 an extended DMRS scrambling identifier and map a PRACH preamble to a PUSCH resource unit (PRU) to perform a DMRS generation procedure. In this way, the UE may generate an extended DMRS scrambling identifier that reduces the likelihood of collisions during CBRA-based two-step RACH.

[0050]

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

[0051]

[0055] FIG. 6 is a diagram showing Example 600 that uses an extended DMRS scrambling identifier for DMRS communication according to various aspects of the present disclosure. As shown in FIG. 6, Example 600 includes BS 110 communicating with UE 120.

[0052]

[0056] As further shown in FIG. 6 and by reference number 610, the UE 120 may receive information identifying the amount of DMRS sequences supported per antenna panel of the BS 110. For example, the BS 110 may transmit to a group of UEs 120 including that UE information identifying the amount of DMRS sequences supported per antenna panel. In some aspects, the UE 120 may receive DMRS sequence configuration information from the BS 110 (e.g., by using the "msgA-ScramblingID0" parameter or the "msgA-ScramblingID1" parameter in an example, or by configuring one or more additional DMRS positions) based at least in part on how the BS 110 configures one or more DMRS sequences for DMRS communication. In this case, the 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, the UE 120 may receive information instructing that the BS 110 supports, for example, 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 an extended DMRS scrambling identifier per antenna port and provide system information or RRC signaling to the UE 120 to identify the configured extended DMRS scrambling identifier.

[0053]

[0057] As further shown in FIG. 6 and by reference number 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 the 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 way, the UE 120 may reuse the scrambling identifier of the msgA PUSCH to be transmitted together with the DMRS communication as described above. In some aspects, the UE 120 may map the PRACH preamble to the PRU to reuse the scrambling identifier of the msgA PUSCH for the extended DMRS scrambling identifier.

[0054]

[0058] In this case, UE120 may support one or more different possible mapping ratios. For example, UE120 may determine the mapping ratio based at least in part on the amount of PRACH sequence allocated for the msgA preamble on a valid RACH occasion (RO) and the amount of PRU allocated for the msgA payload on a valid PUSCH occasion (PO). In some aspects, UE120 may determine the mapping ratio based at least in part on the broadcast (e.g., system information) received from BS110 or via RRC signaling from BS110. Additionally or alternatively, after the msgA resource occasion and the confirmation of msgA RO and msgA PO for two-step RACH, UE120 may determine the mapping ratio based at least in part on the confirmation rules and mapping order (e.g., received from BS110). In some aspects, each msgA PUSCH configuration in the initial or active bandwidth part may be associated with a single mapping ratio, and different msgA PUSCH configurations may have different mapping ratios. The mapping ratio may be valid at least during the mapping period between msgA RO and msgA PUSCH PO. In this case, the mapping period may be the least common multiple of the SSB-RO association pattern periods for each msgA PUSCH configuration.

[0055]

[0059] In some aspects, UE120 may generate DMRS communication using a specific DMRS pattern. For example, UE120 may generate type I DMRS pattern-based DMRS, type II DMRS pattern-based DMRS, etc.

[0056]

[0060] In some aspects, UE120 may determine an extended DMRS scrambling identifier based at least in part on the type of waveform for transmission including msgA PUSCH and DMRS communications. For example, in the case of a CP-OFDM waveform and when transform precoding is not available, UE120 may determine an extended DMRS scrambling identifier based at least in part on an expression of the following form.

[0057]

Number

[0058] In this case, UE120 re-uses the bit scrambling sequence applied to the payload and CRC of msgA as described above. Additionally or alternatively, UE120 may determine an extended DMRS scrambling identifier based at least in part on an expression of the following form.

[0059]

Number

[0060] Here, l is the OFDM symbol number within a slot, n s,f μ is the slot number within a frame, and <·> is an inner quantity operator (for example, truncating the inner quantity to the K most significant bits (MSB) or least significant bits (LSB)). In this case, UE120 determines an extended DMRS scrambling identifier based at least in part on the bit scrambling sequence, the symbol number for DMRS, the slot number for DMRS, etc.

[0061]

[0061] Additionally or alternatively, when the waveform is a DFT-s-OFDM waveform and transform precoding is available, UE120 may determine an extended DMRS scrambling identifier for group hopping and sequence hopping as follows.

[0062]

Number

[0063] In this case, UE120 may determine the following:

[0064]

Number

[0065] as follows.

[0066]

Number

[0067] Additionally or alternatively, UE120 may determine the following:

[0068]

Number

[0069] as follows.

[0070]

Number

[0071] In this case, support for the CP-OFDM waveform or the DFT-s-OFDM waveform may correspond to determining whether UE120 should apply transform precoding for PUSCH transmission as described above (for example, using CP-OFDM may correspond to not using transform precoding, and using DFT-s-OFDM may correspond to using transform precoding).

[0072] As further shown in FIG. 6 and by reference number 630, UE 120 may transmit DMRS communication. For example, based at least in part on using an extended DMRS scrambling identifier to configure a DMRS sequence, UE 120 may transmit DMRS multiplexed with msgA PUSCH. In this way, BS 110 and UE 120 reduce the possibility of collisions between DMRSs in CBRA-based two-step RACH.

[0073] As noted above, FIG. 6 is provided as an example. Other examples may differ from those described with respect to FIG. 6.

[0074] FIG. 7 is a diagram illustrating an exemplary process 700, such as may be performed by a UE, in accordance with various aspects of the present disclosure. Exemplary process 700 is an example of operations associated with a UE (such as UE 120, etc.) using an extended demodulation reference signal scrambling identifier for demodulation reference signal communication.

[0075] As shown in FIG. 7, in some aspects, process 700 may include receiving, from a BS, information identifying the amount of DMRS sequences supported per antenna panel of the BS (block 710). For example, a UE (such as using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, or controller / processor 280 in an example) may receive, from a BS, information identifying the amount of DMRS sequences supported per antenna panel of the BS as described above.

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

[0077] Process 700 may include additional aspects, such as any single aspect or any combination of aspects related to one or more other processes described below and / or elsewhere in this specification.

[0078] In a first aspect, process 700 includes configuring one or more DMRS sequences, which 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 4 or 8.

[0080]

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

[0081]

[0071] In the fourth aspect, alone or in combination with one or more of the first to third aspects, configuring one or more DMRS sequences involves 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]

[0072] In the fifth aspect, alone or in combination with one or more of the first to fourth aspects, DMRS communication is associated with a physical uplink shared channel with transform precoding.

[0083]

[0073] In the sixth aspect, alone or in combination with one or more of the first to fifth aspects, DMRS communication is associated with a physical uplink shared channel without transform precoding.

[0084]

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

[0085]

[0075] In the eighth aspect, alone or in combination with one or more of the first to seventh aspects, the extended DMRS scrambling identifier is configured for each 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 through eighth aspects, process 700 may include determining a mapping ratio based at least in part on at least one of a system information transmission received from a BS, a radio resource control transmission received from a BS, a set of verification rules, or a mapping order.

[0087]

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

[0088]

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

[0089]

[0079] In a twelfth aspect, alone or in combination with one or more of the first through 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 through twelfth aspects, 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 DMRS communication may include transmitting DMRS communication based at least in part on configuring one or more DMRS sequences for DMRS communication.

[0091]

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

[0092]

[0082] The foregoing disclosure provides illustration and description, but is not exhaustive or limiting of the disclosed forms to the exact form disclosed. Modifications and variations may be made in light of the above disclosure or obtained from practice of the aspects.

[0093]

[0083] As used herein, the term "component" is to be broadly construed as hardware, firmware, and / or a combination of hardware and software. A processor as used herein is implemented in hardware, firmware, and / or a combination of hardware and software.

[0094]

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

[0095]

[0085] It will be apparent that the systems and / or methods described herein can be implemented in different forms of hardware, firmware, and / or combinations of hardware and software. The actual special control hardware or software code used to implement these systems and / or methods is not limiting of the aspects. Accordingly, the operation and behavior of the systems and / or methods are described herein without reference to specific software code, and it is understood that software and hardware can be designed based at least in part on the description herein to implement the systems and / or methods.

[0096]

[0086] Particular combinations of features are recited in the claims and / or disclosed herein, but these combinations are not limiting of the disclosure of the various aspects. In fact, many of these features can be combined in ways not specifically recited in the claims and / or disclosed herein. Each dependent claim below can depend directly on only one claim, but the disclosure of the various aspects includes each dependent claim in combination with any other claim in the claims. A phrase that refers to a list of items “of which at least one” refers to any combination of those items, including a single member. By way of example, “at least one of a, b, or c” includes a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination having multiple of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c, or any other order of a, b, and c).

[0097]

[0087] Any element, act, or instruction used in this specification should not be construed as important or essential unless explicitly described as such. Also, the articles "a" and "an" used in this specification include one or more items and can be used interchangeably with "one or more". Further, the terms "set" and "group" used in this specification include one or more items (e.g., related items, unrelated items, combinations of related and unrelated items, etc.) and can be used interchangeably with "one or more". If only one item is intended, the phrase "only one" or a similar expression is used. Also, the terms "has", "have", "having", etc. used in this specification shall be considered open-ended terms. Further, the phrase "based on" means "at least partially based on" unless otherwise specified. The invention described in the claims of the present application at the time of initial filing is appended below. [C1] A method of wireless communication performed by a user equipment (UE), comprising: receiving, from a base station (BS), information identifying the amount of a demodulation reference signal (DMRS) sequence supported for each antenna panel of the BS; transmitting DMRS communication having one or more DMRS sequences, the DMRS communication being scrambled using an extended DMRS scrambling identifier based at least in part on the physical random access channel preamble and configured at least in part based on the amount of the DMRS sequence supported for each antenna panel; A method comprising the steps of: [C2] Further comprising configuring the one or more DMRS sequences for the DMRS communication based at least in part on the amount of the DMRS sequence supported for each antenna panel and the physical random access channel preamble, wherein transmitting the DMRS communication comprises transmitting the DMRS communication based at least in part on configuring the one or more DMRS sequences for the DMRS communication. A method according to C1. [C3] Configuring the one or more DMRS sequences comprises generating a waveform for the DMRS communication, 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. A method according to C2. [C4] The method according to C1, wherein the amount of the DMRS sequence supported for each antenna panel is 4 or 8. [C5] The method according to C1, wherein the DMRS pattern of the one or more DMRS sequences is a type I DMRS pattern or a type II DMRS pattern. [C6] The method according to C1, wherein the extended DMRS scrambling identifier is configured for each antenna port via system information or radio resource control transmission. ​ ​ [C7] Mapping the physical random access channel preamble to a PUSCH resource unit comprising the one or more DMRS sequences in relation to a mapping ratio during a mapping period between the preamble and the physical uplink shared channel (PUSCH) resource unit The method according to C1, further comprising [C8] The mapping ratio is system information transmission received from the BS, radio resource control transmission received from the BS, a set of confirmation rules, or mapping order determined at least partially based on at least one of The method according to C7, further comprising [C9] The mapping ratio is defined for a PUSCH configuration such that each PUSCH configuration in a plurality of PUSCH configurations in an initial or active bandwidth part is associated with a single mapping ratio, according to the method of C7. [C10] The method according to C9, wherein a first PUSCH configuration among the plurality of PUSCH configurations is associated with a different mapping ratio than a second PUSCH configuration among the plurality of PUSCH configurations. [C11] The method according to C7, wherein the mapping period is at least partially based on a synchronization signal block - random access channel occasion association pattern period. [C12] The method according to C1, wherein the DMRS communication is associated with a physical uplink shared channel with transform precoding. [C13] The method according to C1, wherein the DMRS communication is associated with a physical uplink shared channel without transform precoding. [C14] The method according to C1, wherein the extended DMRS scrambling identifier is at least partially based on a physical uplink shared channel (PUSCH) scrambling identifier of a physical random access channel message associated with the physical random access channel preamble. [C15] A user equipment (UE) for wireless communication, comprising a memory, one or more processors coupled to the memory and the memory and the one or more processors are configured to receive, from a base station (BS), information identifying an amount of demodulation reference signal (DMRS) sequences supported for each antenna panel of the BS Transmitting DMRS communication having one or more DMRS sequences, which is configured at least in part based on the amount of the DMRS sequence supported for each antenna panel and is scrambled using an extended DMRS scrambling identifier based at least in part on a physical random access channel preamble A user equipment (UE) configured to perform the above. [C16] The one or more processors Configure the one or more DMRS sequences for the DMRS communication based at least in part on the amount of the DMRS sequence supported for each antenna panel and the physical random access channel preamble And is further configured to perform Here, when the one or more processors transmit the DMRS communication Transmit the DMRS communication based at least in part on configuring the one or more DMRS sequences for the DMRS communication The UE according to C15, configured to perform the above. [C17] When the one or more processors configure the one or more DMRS sequences Generate a waveform for the DMRS communication Here, 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 The UE according to C16, configured to perform the above. [C18] The UE according to C15, wherein the amount of the DMRS sequence supported for each antenna panel is 4 or 8. [C19] The UE according to C15, wherein the DMRS pattern of the one or more DMRS sequences is a type I DMRS pattern or a type II DMRS pattern. [C20] The UE according to C15, wherein the extended DMRS scrambling identifier is configured for each antenna port via system information or radio resource control transmission. [C21] The one or more processors Mapping the physical random access channel preamble to a PUSCH resource unit comprising the one or more DMRS sequences in relation to a mapping ratio during a mapping period between the preamble and the physical uplink shared channel (PUSCH) resource unit The UE according to C15, further configured to perform the above. [C22] When executed by one or more processors of the one or more processors, the mapping ratio is system information transmission received from the BS, radio resource control transmission received from the BS, a set of confirmation rules, or mapping order determined at least partially based on at least one of the above The UE according to C21, further configured to perform the above. [C23] The UE according to C21, wherein the mapping ratio is defined for each PUSCH configuration among a plurality of PUSCH configurations in an initial or active bandwidth part such that each PUSCH configuration is associated with a single mapping ratio. [C24] The UE according to C23, wherein a first PUSCH configuration among the plurality of PUSCH configurations is associated with a mapping ratio different from that of a second PUSCH configuration among the plurality of PUSCH configurations. [C25] The UE according to C21, wherein the mapping period is at least partially based on a synchronization signal block - random access channel occasion association pattern period. [C26] The UE according to C15, wherein the DMRS communication is associated with a physical uplink shared channel with transform precoding. [C27] The UE according to C15, wherein the DMRS communication is associated with a physical uplink shared channel without transform precoding. [C28] The UE according to C15, wherein the extended DMRS scrambling identifier is at least partially based on a physical uplink shared channel (PUSCH) scrambling identifier of a physical random access channel message associated with the physical random access channel preamble. [C29] A non - transitory computer - readable medium storing one or more instructions for wireless communication, the one or more instructions being when executed by one or more processors of a user equipment (UE), cause the one or more processors to Receiving, from a base station (BS), information identifying an amount of demodulation reference signal (DMRS) sequences supported for each antenna panel of the BS; Transmitting DMRS communication having one or more DMRS sequences, which is configured at least partially based on the amount of the DMRS sequences supported for each antenna panel and is scrambled using an extended DMRS scrambling identifier based at least partially on a physical random access channel preamble; A non-transitory computer-readable medium comprising one or more instructions for causing the above to be performed. [C30] Means for receiving, from a base station (BS), information identifying an amount of demodulation reference signal (DMRS) sequences supported for each antenna panel of the BS; Means for transmitting DMRS communication having one or more DMRS sequences, which is configured at least partially based on the amount of the DMRS sequences supported for each antenna panel and is scrambled using an extended DMRS scrambling identifier based at least partially on a physical random access channel preamble; An apparatus for wireless communication comprising the above.

Claims

1. A method of wireless communication performed by a user equipment (UE), comprising: receiving, from a base station (BS), information identifying an amount of demodulation reference signal (DMRS) sequences supported for each antenna panel of the BS; transmitting DMRS communication having one or more DMRS sequences, the DMRS communication being scrambled using an extended DMRS scrambling identifier that is at least partially based on a physical random access channel preamble and is at least partially configured based on the amount of DMRS sequences supported for each antenna panel of the BS, wherein the DMRS communication comprises a physical uplink shared channel (PUSCH) resource unit including the one or more DMRS sequences; mapping the physical random access channel preamble to the PUSCH resource unit including the one or more DMRS sequences to determine the extended DMRS scrambling identifier; comprising: wherein the mapping comprises mapping the physical random access channel preamble to the PUSCH resource unit including the one or more DMRS sequences in relation to a mapping ratio within a mapping period between the physical random access channel preamble and the PUSCH resource unit; wherein the mapping ratio is defined for a PUSCH configuration such that each PUSCH configuration in an initial or active bandwidth part is associated with a single mapping ratio; a method.

2. further comprising configuring the one or more DMRS sequences for the DMRS communication based at least in part on the amount of DMRS sequences supported for each antenna panel and the physical random access channel preamble; comprising: wherein transmitting the DMRS communication comprises transmitting the DMRS communication based at least in part on configuring the one or more DMRS sequences for the DMRS communication; The method according to claim 1.

3. wherein configuring the one or more DMRS sequences comprises generating a waveform for the DMRS communication; 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. The method according to claim 2.

4. The method according to claim 1, wherein the amount of DMRS sequences supported for each antenna panel is 4 or 8.

5. The method according to 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. The method according to claim 1, wherein the extended DMRS scrambling identifier is provided via system information or radio resource control transmission and is configured for each antenna panel.

7. The mapping ratio is the received system information transmission from the BS, the received radio resource control transmission from the BS, a set of verification rules, or the mapping order to be determined at least partially based on at least one of them. The method according to claim 1, further comprising.

8. The method according to claim 1, wherein a first PUSCH configuration among the plurality of PUSCH configurations is associated with a different mapping ratio than a second PUSCH configuration among the plurality of PUSCH configurations.

9. The method according to claim 1, wherein the mapping period is at least partially based on a synchronization signal block - random access channel occasion association pattern period.

10. The method according to claim 1, wherein the DMRS communication is associated with a physical uplink shared channel with transform precoding.

11. The method according to claim 1, wherein the DMRS communication is associated with a physical uplink shared channel without transform precoding.

12. The method according to claim 1, wherein the extended DMRS scrambling identifier is at least partially based on a physical uplink shared channel (PUSCH) scrambling identifier of a physical random access channel message associated with the physical random access channel preamble.

13. Means for receiving from a base station (BS) information for identifying the amount of demodulation reference signal (DMRS) sequences supported for each antenna panel of the BS. Means for transmitting DMRS communication having one or more DMRS sequences, configured at least in part based on said amount of the DMRS sequence supported for each antenna panel of said BS, and scrambled using an extended DMRS scrambling identifier based at least in part on a physical random access channel preamble, wherein said DMRS communication comprises a physical uplink shared channel (PUSCH) resource unit comprising said one or more DMRS sequences, Means for mapping said physical random access channel preamble to said PUSCH resource unit comprising said one or more DMRS sequences for determining said extended DMRS scrambling identifier, An apparatus for wireless communication, comprising: Said means for mapping comprises means for mapping said physical random access channel preamble to said PUSCH resource unit comprising said one or more DMRS sequences in relation to a mapping ratio during a mapping period between said physical random access channel preamble and said PUSCH resource unit, Said mapping ratio is defined for a PUSCH configuration such that each PUSCH configuration of a plurality of PUSCH configurations is associated with a single mapping ratio in an initial or active bandwidth part, An apparatus for wireless communication. Claims 14 A computer program comprising instructions which, when executed by one or more processors of a user equipment (UE), cause said one or more processors to perform the method according to any one of claims 1 to 12.

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