Enhanced UL DMRS configurations

Abstract

To provide methods, systems, and a computer-readable medium.SOLUTION: A method includes: determining a frequency division (FD) based mapping pattern for mapping uplink (UL) demodulation reference signals (DMRS) to a single orthogonal frequency-division multiple access symbol (OFDM), where the DMRS are associated with eight antenna ports; and communicating, using the FD-based mapping pattern, a communication including a resource block that includes the UL DMRS mapped to the single OFDM symbol.SELECTED DRAWING: Figure 1A

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority to U.S. Provisional Patent Application No. 63 / 320,677, filed March 16, 2022, entitled "Enhanced UL DMRS Configurations."

[0002] The present disclosure relates to methods and systems for enhanced uplink (UL) demodulation reference signal (DMRS) configuration. [Background technology]

[0003] Wireless communication networks provide integrated communications platforms and telecommunications services to wireless user devices. Exemplary telecommunications services include telephony, data (e.g., voice, audio, and / or video data), messaging, Internet access, and / or other services. Wireless communication networks have radio access nodes that exchange wireless signals with wireless user devices using radio network protocols, such as those described in various telecommunications standards promulgated by the 3rd Generation Partnership Project (3GPP). Exemplary wireless communication networks include time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal frequency division multiple access (OFDMA) networks, Long Term Evolution (LTE), and Fifth Generation New Radio (5G NR). Wireless communication networks facilitate mobile broadband services using technologies such as OFDM, multiple input multiple output (MIMO), advanced channel coding, massive MIMO, beamforming, and / or other features.

[0004] Demodulation Reference Signals (DMRS) are used in wireless communication networks to determine the quality of downlink and uplink channels. For example, DMRS may be transmitted in the uplink (UL) using a Physical Uplink Shared Channel (PUSCH). DMRS and PUSCH are subject to the same transmission conditions (e.g., DMRS and PUSCH are transmitted using the same precoding and antenna port). A base station receiving PUSCH and DMRS knows the sequence transmitted by the DMRS. The base station uses this information and the received DMRS to determine the UL transmission conditions.

[0005] Another signal used in wireless communication networks is the Phase Tracking Reference Signal (PTRS). Similar to DMRS, this signal can be used in both uplink (e.g., PUSCH) and downlink communications. The main function of this signal is to track the phase of the local oscillators in the transmitter and receiver. Therefore, this signal can be used to compensate for the effects of phase noise and frequency offset in uplink or downlink communications. Summary of the Invention

[0006] The present disclosure is directed to a method, system, apparatus, computer program, or combination thereof for implementing an enhanced uplink (UL) DMRS configuration that, among other benefits, can support at least eight antenna ports when PTRS is enabled.

[0007] According to one aspect of the present disclosure, a method performed by a user equipment (UE) includes determining a frequency division (FD)-based mapping pattern for mapping an uplink (UL) demodulation reference signal (DMRS), the DMRS being associated with eight antenna ports, to a single orthogonal frequency division multiple access (OFDM) symbol; generating a communication using the FD-based mapping pattern, the communication including a resource block including the UL DMRS mapped to the single OFDM symbol; and transmitting the communication to a serving base station.

[0008] Other versions include corresponding systems, apparatus including one or more processors, and computer programs for performing the actions of the methods defined by instructions encoded on a computer-readable storage device. These and other versions may optionally include one or more of the following features.

[0009] In some implementations, the FD-based mapping pattern includes an FD orthogonal cover code of length 4 (FD-OCC4) and two control division multiplexing (CDM) groups.

[0010] In some implementations, communicating a communication including a resource block including an UL DMRS mapped to a single OFDM symbol using an FD-based mapping pattern includes:

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[0011] In some implementations, k=4n+k'+delta, where delta is selected from the set {0,4} and k' is selected from the set {0,1,2,3}.

[0012] In some implementations, the FD-based mapping pattern includes an FD orthogonal cover code of length 2 (FD-OCC2) and four control division multiplexing (CDM) groups.

[0013] In some implementations, communicating a communication including a resource block including an UL DMRS mapped to a single OFDM symbol using an FD-based mapping pattern includes:

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[0014] In some implementations, k=4n+k'+delta, where delta is selected from the set {0,2,4,6} and k' is selected from the set {0,1}.

[0015] In some implementations, the communication includes a plurality of resource blocks including the DMRS, and the number of resource blocks in the plurality is an even number.

[0016] In some implementations, determining a frequency division (FD)-based mapping pattern for mapping an uplink (UL) demodulation reference signal (DMRS) includes receiving signaling indicating whether to use a network-specific mapping pattern or a UE-specific mapping pattern.

[0017] In some implementations, the signaling is one of higher layer signaling or downlink control information (DCI).

[0018] In some implementations, the higher layer signaling is one of radio resource control (RRC) signaling or medium access control (MAC) control element (CE).

[0019] In some implementations, the method further includes determining, based on the signaling, to use network-specific mapping, and in response, determining an FD-based mapping pattern based on one of (i) a reference point and assigned resource block indices for the current active bandwidth portion, or (ii) a common reference point and assigned resource block indices.

[0020] According to another aspect of the present disclosure, a method includes determining a time division multiplexing (TDM) based mapping pattern for mapping an uplink (UL) demodulation reference signal (DMRS), the DMRS being grouped into a plurality of control division multiplexing (CDM) groups, to a DMRS symbol, the mapping pattern using TDM to multiplex the plurality of CDM groups in the DMRS symbol; generating a communication using the TDM based mapping pattern, the communication including a resource block including the UL DMRS mapped to the DMRS symbol; and transmitting the communication to a serving base station.

[0021] Other versions include corresponding systems, apparatus including one or more processors, and computer programs for performing the actions of the methods defined by instructions encoded on a computer-readable storage device. These and other versions may optionally include one or more of the following features.

[0022] In some implementations, communicating a communication including a resource block including an UL DMRS mapped to a DMRS symbol using a TDM-based mapping pattern includes mapping each of a plurality of CDM groups to a separate DMRS symbol.

[0023] In some implementations, the plurality of CDM groups includes four CDM groups and the DMRS symbols includes two DMRS symbols.

[0024] In some implementations, two of the four CDM groups are mapped to each DMRS symbol.

[0025] In some implementations, the plurality of CDM groups includes six CDM groups and the DMRS symbols includes two DMRS symbols.

[0026] In some implementations, three of the six CDM groups are mapped to each DMRS symbol.

[0027] The details of one or more embodiments of these systems and methods are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of these systems and methods will be apparent from the description and drawings, and from the claims. [Brief explanation of the drawings]

[0028] [Figure 1A] 1 illustrates exemplary patterns of two existing types of DMRS configurations. [Figure 1B] 1 illustrates exemplary patterns of two existing types of DMRS configurations. [Figure 2] FIG. 1 illustrates an exemplary wireless network, according to some embodiments. [Figure 3] 1 illustrates an exemplary pattern of a first extended DMRS configuration in accordance with some embodiments. [Figure 4] 10 illustrates an exemplary pattern of a second extended DMRS configuration in accordance with some embodiments. [Figure 5] 1 illustrates an exemplary network-side resource mapping pattern, according to some embodiments. [Figure 6A] 10 illustrates an example pattern of a fourth extended DMRS configuration, according to some embodiments. [Figure 6B] 10 illustrates an example pattern of a fourth extended DMRS configuration, according to some embodiments. [Figure 7A] 10 illustrates an example pattern of a fifth extended DMRS configuration, according to some embodiments. [Figure 7B] 10 illustrates an example pattern of a fifth extended DMRS configuration, according to some embodiments. [Figure 8A] 1 illustrates a flowchart of an exemplary method, according to some embodiments. [Figure 8B] 10 illustrates another flowchart of an exemplary method, according to some embodiments. [Figure 9] 1 illustrates a user equipment (UE) according to some embodiments. [Figure 10] 1 illustrates an access node according to some embodiments. DETAILED DESCRIPTION OF THE INVENTION

[0029] Existing wireless communication systems support two types of uplink (UL) demodulation reference signals (DMRS), namely, Type 1 DMRS and Type 2 DMRS. Type 1 DMRS supports up to eight antenna ports. Furthermore, Type 1 DMRS uses a frequency-domain orthogonal cover code of length 2 (FD-OCC2), a time-domain OCC of length 2 (TD-OCC2), and two code division multiplexing (CDM) groups. Type 2 DMRS supports up to 12 antenna ports and uses FD-OCC2, TD-OCC2, and three CDM groups. These existing systems are described in Release 15 of the standards promulgated by the 3rd Generation Partnership Project (3GPP). These standards include 3GPP Technical Specifications (TS).

[0030] 1A and 1B show exemplary patterns for two existing types of DMRS configurations according to some embodiments. Specifically, FIG. 1A shows an exemplary pattern 100 of a Type-1 DMRS mapped to resource elements. As shown in FIG. 1A, the Type-1 DMRS supports up to eight antenna ports and uses FD-OCC2, TD-OCC2, and two CDM groups to map the DMRS to resource elements. FIG. 1B shows an exemplary pattern 120 of a Type-2 DMRS mapped to resource elements. As shown in FIG. 1B, the Type-2 DMRS supports up to 12 antenna ports and uses FD-OCC2, TD-OCC2, and three CDM groups to map the DMRS to resource elements. As shown in FIGS. 1A and 1B, the patterns 100, 120 are spread across two DMRS symbols within a resource block.

[0031] However, existing wireless communication systems do not allow the use of TD-OCC (e.g., TD-OCC2) when a phase tracking reference signal (PTRS) is enabled. It is assumed that when PTRS is enabled, the time-domain phase noise is too large and using TD-OCC may further degrade performance, so the use of TD-OCC is not allowed in this scenario. As a result, when PTRS is enabled, only a maximum of four antenna ports are supported for Type 1 DMRS and only a maximum of six antenna ports are supported for Type 2 DMRS (because TD-OCC cannot be used). This configuration prevents performance degradation due to TD-OCC, but limits the number of antenna ports that can be supported by DMRS.

[0032] This disclosure describes methods and systems for implementing an extended UL DMRS configuration that, among other benefits, can support at least eight antenna ports when PTRS is enabled.

[0033] 2 illustrates a wireless network 200 according to some embodiments. The wireless network 200 includes a UE 202 and a base station 204 connected via one or more channels 206A, 206B over an air interface 208. The UE 202 and the base station 204 communicate using a system that supports control for managing the UE 202's access to the network via the base station 204.

[0034] For convenience, but not by way of limitation, wireless network 200 is described in the context of Long Term Evolution (LTE) and Fifth Generation (5G) New Radio (NR) communication standards as defined by 3GPP TS. Wireless network 200 may be a non-standalone (NSA) network incorporating both LTE and NR, such as an Evolved Universal Terrestrial Radio Access (E-UTRA)-NR Dual Connectivity (EN-DC) network and an NE-DC network. However, wireless network 200 may also be a standalone (SA) network incorporating only NR. Furthermore, other types of communication standards are possible, including future 3GPP systems (e.g., sixth generation (6G)) systems, Institute of Electrical and Electronics Engineers (IEEE) 802.11 technology, IEEE 802.16 protocols (e.g., WMAN, WiMAX, etc.), etc. Although aspects may be described herein using terminology generally associated with 5G NR, aspects of the present disclosure may be applied to other systems, such as 3G, 4G, and / or systems subsequent to 5G (e.g., 6G).

[0035] In wireless network 200, UE 202 and any other UEs in the system may be, for example, laptop computers, smartphones, tablet computers, machine-type devices such as smart meters or dedicated devices for healthcare monitoring, remote security monitoring systems, intelligent transportation systems, or any other wireless devices with or without a user interface. In network 200, base stations 204 provide UE 202 with network connectivity to a wider network (not shown). This UE 202 connectivity is provided via an air interface 208 within a base station coverage area provided by base station 204. In some embodiments, such a wider network may be a wide area network operated by a cellular network provider or may be the Internet. Each base station coverage area associated with a base station 204 is supported by one or more antennas integrated with the base station 204. The coverage area is divided into multiple sectors associated with specific antennas. Such sectors may be physically associated with fixed antennas or may be assigned to a physical area using tunable antennas or antenna settings that can be adjusted in a beamforming process used to direct signals to specific sectors.

[0036] The UE 202 includes a control circuit 210 coupled to a transmit circuit 212 and a receive circuit 214. The transmit circuit 212 and the receive circuit 214 may each be coupled to one or more antennas. The control circuit 210 may be adapted to perform operations associated with implementing an enhanced UL DMRS configuration. The control circuit 210 may include various combinations of application-specific circuitry and baseband circuitry. The transmit circuit 212 and the receive circuit 214 may be adapted to transmit and receive data, respectively, and may include radio frequency (RF) circuitry or front-end module (FEM) circuitry.

[0037] In various embodiments, aspects of the transmit circuitry 212, the receive circuitry 214, and the control circuitry 210 may be integrated in various ways to implement the circuitry described herein. The control circuitry 210 may be adapted or configured to perform various operations, such as those described elsewhere in this disclosure related to a UE. The transmit circuitry 212 may transmit multiple multiplexed uplink physical channels. The multiple uplink physical channels may be multiplexed via time division multiplexing (TDM) or frequency division multiplexing (FDM) with carrier aggregation. The transmit circuitry 212 may be configured to receive block data from the control circuitry 210 for transmission over the air interface 208. Similarly, the receive circuitry 214 may receive multiple multiplexed downlink physical channels from the air interface 208 and relay the physical channels to the control circuitry 210. The multiple downlink physical channels may be multiplexed via TDM or FDM with carrier aggregation. The transmit circuitry 212 and receive circuitry 214 may transmit and receive both control data and content data (eg, messages, images, videos, etc.) structured in data blocks carried by the physical channel.

[0038] 2 also shows a base station 204. In an embodiment, the base station 204 may be an NG Radio Access Network (RAN) or 5G RAN, an E-UTRAN, a non-terrestrial cell, or a legacy RAN such as UTRAN or GERAN. As used herein, terms such as "NG RAN" may refer to a base station 204 operating in an NR or 5G wireless network 200, and terms such as "E-UTRAN" may refer to a base station 204 operating in an LTE or 4G wireless network 200. The base station 204 utilizes connections (or channels) 206A, 206B, each of which includes a physical communication interface or layer.

[0039] The base station 204 circuitry may include control circuitry 216 coupled to transmit circuitry 218 and receive circuitry 220. The transmit circuitry 218 and receive circuitry 220 may each be coupled to one or more antennas that may be used to facilitate communication over the air interface 208.

[0040] The control circuitry 216 may be adapted to perform operations to implement an enhanced UL DMRS configuration. The transmit circuitry 218 and the receive circuitry 220 may be adapted to transmit and receive data, respectively, to any UE connected to the base station 204. The transmit circuitry 218 may transmit a downlink physical channel consisting of multiple downlink subframes. The receive circuitry 220 may receive multiple uplink physical channels from various UEs, including the UE 202.

[0041] In some embodiments, one or more channels 206A, 206B are denoted as an air interface enabling a communicative coupling and may conform to a cellular communication protocol such as a GSM protocol, a CDMA network protocol, a PTT protocol, a POC protocol, a UMTS protocol, a 3GPP LTE protocol, an Advanced Long Term Evolution (LTE-A) protocol, an LTE-based access to unlicensed spectrum (LTE-U), a 5G protocol, an NR protocol, an NR-based access to unlicensed spectrum (NR-U) protocol, and / or any of the other communication protocols described herein. In embodiments, the UE 202 may directly exchange communication data over the ProSe interface. The ProSe interface may alternatively be referred to as an SL interface and may include one or more logical channels, including, but not limited to, a PSCCH, a PSSCH, a PSDCH, and a PSBCH.

[0042] In some embodiments, the UE 202 is configured to implement one or more extended UL DMRS configurations. The UE 202 may be pre-configured to select one of the extended UL DMRS configurations (e.g., based on 3GPP standards) or may receive signaling from the base station 204 indicating the extended UL DMRS configuration to use. As described in more detail below, the one or more extended UL DMRS configurations support at least eight antenna ports. In some examples, the extended UL DMRS configuration supports eight antenna ports within a single DMRS symbol. Thus, among other benefits, the extended UL DMRS configuration can support at least eight antenna ports when PTRS is enabled.

[0043] In some embodiments, the first extended UL DMRS configuration uses FD-OCC of length 4 (FD-OCC4) and two CDM groups in a single DMRS symbol. This configuration supports up to eight antenna port transmissions in a single DMRS symbol. The first UL DMRS configuration can include one or more DMRS symbols. In one example, the UE 202 generates a DMRS for each resource element (RE) in the DMRS symbol using Equation [1].

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[0044] In some examples, the UE 202 may set the delta (frequency domain offset) and w for each port according to Table 1. f Select . [Table 1]

[0045] FIG. 3 illustrates an example pattern 300 of a first extended DMRS configuration in accordance with some embodiments. Note that pattern 300 is for a resource block, and a UE 202 may transmit DMRS in several resource blocks across the bandwidth allocated to the UE (the “allocated bandwidth”). As shown in FIG. 3, pattern 300 uses FD-OCC4 and two CDM groups within each DMRS symbol (labeled as symbols 302a and 302b). Furthermore, each symbol supports up to eight antenna port transmissions. In particular, the four subcarriers designated for CDM group 1 can include up to four antenna ports, and the four subcarriers designated for CDM group 2 can include up to four antenna ports. Thus, the first extended DMRS configuration can support up to eight antenna ports when PTRS is enabled and only one DMRS symbol is transmitted.

[0046] However, as shown in Figure 3, the number of subcarriers allocated to CDM group 1 and CDM group 2 within a resource block may be different. Thus, the aggregate number of subcarriers for CDM group 1 across the allocated bandwidth may differ from the aggregate number of subcarriers for CDM group 2. In some embodiments, to avoid a difference in the total number of subcarriers allocated to each of CDM group 1 and CDM group 2, UE 202 is configured to use an even number of physical resource blocks (PRBs) to transmit the DMRS. Furthermore, UE 202 sets the aggregate DMRS for CDM group 1 and CDM group 2 to be equal to each other.

[0047] In some embodiments, the second extended UL DMRS configuration uses FD-OCC2 and four CDM groups for one DMRS symbol. The second extended UL DMRS configuration supports eight antenna port transmissions in a single DMRS symbol. In one example, the UE 202 uses Equation [3] to generate the DMRS for each RE.

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[0048] In other examples, the UE 202 is configured to multiplex CDM groups onto non-contiguous resource elements. In these examples, the UE 202 determines the values ​​of k', n, and k as follows: k'=0,1 n=0,1,2,... k=4n+4k'+delta, where delta=0,1,2,3

[0049] In some examples, the UE 202 may calculate the delta and w for each port according to Table 2. f The system is configured to select: [Table 2]

[0050] FIG. 4 illustrates an example pattern 400 of a second extended DMRS configuration according to some embodiments. Note that pattern 400 is for a resource block; the UE 202 may transmit DMRS in several resource blocks across the allocated bandwidth. As shown in FIG. 4, pattern 400 uses FD-OCC2 and four CDM groups in each DMRS symbol (labeled as symbols 402a and 402b). Furthermore, each symbol supports up to eight antenna port transmissions. In particular, the two subcarriers designated for CDM group 1 can include up to two antenna ports, the two subcarriers designated for CDM group 2 can include up to two antenna ports, the two subcarriers designated for CDM group 3 can include up to two antenna ports, and the two subcarriers designated for CDM group 4 can include up to two antenna ports. Thus, the second extended DMRS configuration can support up to eight antenna ports when PTRS is enabled and only one DMRS symbol is transmitted.

[0051] In some examples, the resource blocks used by the UE 202 to transmit DMRS in the second enhanced UL DMRS configuration are configured to be even, which ensures the same channel estimation and decoding performance for different antenna ports and their associated layers.

[0052] However, in both the first and second enhanced UL DMRS configurations, the resource mapping patterns for different resource blocks in the assigned bandwidth may be different. As a result, a base station receiving DMRS from a UE operating in multi-user multiple-input multiple-output (MU-MIMO) may not be able to distinguish between the antenna ports of each UE. In some embodiments, to support MU-MIMO operation in the first and second enhanced UL DMRS configurations, a resource mapping pattern is defined based on resource blocks in the entire bandwidth. Such a resource mapping pattern is referred to as a network-specific resource mapping pattern. In one example, the UE can identify the resource mapping pattern to use based on a reference point for the current active bandwidth portion and the assigned resource block index. Alternatively, the UE can identify the resource mapping pattern based on a common reference point (e.g., point A) and the assigned resource block index.

[0053] In some embodiments, the resource mapping pattern may be UE-specific. This configuration can be used for single-user MIMO (SU-MIMO) or MU-MIMO where the assigned resource blocks fully overlap. In these embodiments, the resource mapping pattern is generated based on the resource blocks assigned for the UE.

[0054] In some embodiments, the UE 202 determines whether to use a network-specific resource mapping pattern or a UE-specific resource mapping pattern based on higher layer signaling (e.g., radio resource control [RRC] or media access control [MAC] control element [CE]), downlink control information (DCI), the number of co-scheduled UEs, and / or the scheduled bandwidth. Alternatively, the UE 202 may be configured with a specification to use a network-specific resource mapping pattern or a UE-specific resource mapping pattern. In some examples, the network-specific resource mapping pattern may be common to a bandwidth portion (BWP) with the same mathematical arithmetic as the UE and may be invariant with the starting resource block of the BWP. That is, the resource mapping pattern is applied from the first PRB from the network side instead of the first scheduled physical resource block for the UE. For example, if there are 100 RBs in the entire bandwidth and the BWP for the UE is configured as RB{51, 52, ... 100}, the mapping pattern starts from RB#1 (as opposed to RB#51).

[0055] FIG. 5 illustrates an exemplary network-side resource mapping pattern 500, according to some embodiments. In this example, the network provides the network-side resource mapping pattern 500 to the UEs. Each UE can use the mapping pattern 500 to determine the resource mapping pattern to use in each resource block, perhaps based on a reference point of the current active bandwidth portion and the assigned resource block index. Alternatively, the UE can identify the resource mapping pattern based on a common reference point (e.g., point A) and the assigned resource block index. For example, the UE can determine to use resource mapping pattern 502 in resource block 1 and resource mapping pattern 504 in resource block 2. As an example, the UE is assigned resource blocks (4, 5, 6, 10, 11, 12), perhaps by signaling 508. The UE can identify the mapping pattern to use in each of those resource blocks using the described techniques.

[0056] In some embodiments, a third enhanced UL DMRS configuration involves generating a DMRS pattern based on a low peak-to-average power ratio (PAPR) sequence. In this configuration, FD-OCC and TD-OCC are not used. In one example, the UE 202 is configured to use low PAPR sequences defined in 3GPP TS 38.211, section 5.2.2. In one example, the low PAPR sequences

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[0057] In this example, the UE 202 applies different cyclic shifts to different antenna ports. Furthermore, the UE 202 is assigned contiguous RBs, possibly resource allocation type 1, as defined in 3GPP TS 38.214, section 6.1.2.2.2. This configuration can support at least eight antenna ports. In another example, the UE 202 is assigned contiguous or non-contiguous RBs, possibly resource allocation type 0 and / or resource allocation type 1, as defined in 3GPP TS 38.214, section 6.1.2.2.1.

[0058] In some embodiments, the DMRS in this configuration is transmitted resource block by resource block. In these embodiments, the UE 202 assigns a separate PAPR sequence to each resource block group (RBG). In some examples, the UE 202 uses sequence hopping and / or cyclic shift hopping to reduce the PAPR. In these examples, for resource allocation type 0, the UE 202 is configured to generate the DMRS sequence using a sequence hopping and / or cyclic shift hopping pattern or offset for each RBG. In the case of sequence hopping, the UE 202 can determine an initial seed for the random sequence based on the RBG index or the starting resource block index. In the case of cyclic shift hopping, the UE 202 can determine the cyclic shift based on the RBG index or the starting RB index.

[0059] In some embodiments, to support MU-MIMO with partial overlap in a network, a UE 202 is configured to use X CDM groups (e.g., two CDM groups). Different UEs can then use different CDM groups to support MU-MIMO with partial overlap. In an example, the UE 202 can determine the value of X based on a predefined value, higher layer signaling or DCI, or based on the scheduled bandwidth or RBG size. If the number of scheduled RBs is too small, too many CDM groups will lead to a smaller number of REs for each DMRS port, which may cause performance degradation.

[0060] In some embodiments, the fourth enhanced UL DMRS configuration includes time division multiplexed (TDM) CDM constellations. In this configuration, the UE 202 maps different CDM constellations to different symbols. A first type of the fourth enhanced UL DMRS configuration supports four CDM constellations. In this first type, the UE 202 uses two frequency division multiplexed (FDM) CDM constellations, two TDM CDM constellations, and an FD-OCC2 to generate a resource mapping pattern. A second type of the fourth enhanced UL DMRS configuration supports six CDM constellations. In this second type, the UE 202 uses three FDM CDM constellations, two TDM CDM constellations, and an FD-OCC2. Because these two types use FD-OCC2 (as opposed to TD-OCC2), the two types can be used when TD-OCC2 is disabled (e.g., when PTRS is enabled).

[0061] In some embodiments, the UE 202 generates the DMRS for each resource element (RE) using equation [4].

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[0062] In some examples, the UE 202 determines the values ​​of k′, n, l, and k for Type 2 as follows: k'=0,1,2,3 n=0,1,2,... k=6n+k'+delta, where delta=0, 2, 4 · l=l_0,l_0+delta', where l_0 is the starting symbol for DMRS and delta'=0,1,2,4. In some examples, for Type 2, UE 202 may determine Delta, Delta', and w for each port according to Table 4. f Select . [Table 4]

[0063] 6A and 6B illustrate exemplary patterns of a fourth extended DMRS configuration according to some embodiments. Specifically, FIG. 6A illustrates an exemplary pattern 600 of a first type of fourth extended DMRS configuration, and FIG. 6B illustrates an exemplary pattern 610 of a second type of fourth extended DMRS configuration.

[0064] Referring to Figure 6A, pattern 600 is for a resource block, and UE 202 may transmit DMRS in several resource blocks across the allocated bandwidth. As shown in Figure 6A, pattern 600 uses two FDM-based CDM groups, two TDM-based CDM groups, and FD-OCC2 to generate resource mapping pattern 600. Pattern 600 can support a DMRS configuration of up to eight antenna ports. Specifically, the resource elements dedicated to each CDM group can support two antenna ports for a total of eight antenna ports.

[0065] Referring to Figure 6B, pattern 610 is for resource blocks, and UE 202 may transmit DMRS in several resource blocks across the allocated bandwidth. As shown in Figure 6B, pattern 610 uses three FDM-based CDM groups, two TDM-based CDM groups, and FD-OCC2 to generate resource mapping pattern 610. Pattern 610 can support a DMRS configuration of up to 12 antenna ports. Specifically, the resource elements dedicated to each CDM group can support two antenna ports for a total of 12 antenna ports.

[0066] In some embodiments, the energy per resource element (EPRE) ratio between PUSCH and DMRS within a symbol may be determined based on the number of CDM groups with no data in the symbol. Such an embodiment maintains consistent transmit power across symbols. In a first option, the base station indicates the total number of CDM groups across symbols via DCI. In a second option, the base station indicates the total number of CDM groups per DMRS symbol via DCI. Tables 5 and 6 show example results for implementing Option 1 and Option 2, respectively. [Table 5] [Table 6]

[0067] In some embodiments, the fifth enhanced UL DMRS configuration involves TDM and / or FDM-based low PAPR sequences. In these embodiments, different ports are mapped to different comb indices (e.g., starting RE offsets for DMRS), symbols, or cyclic shifts. Furthermore, in the case of TDM and / or FDM, appropriate power scaling is applied to different DMRS resource elements. More specifically, since the EPR ratios may be different for different ports / symbols, the UE may apply different powers to different DMRS ports.

[0068] 7A and 7B illustrate exemplary patterns for a fifth extended DMRS configuration according to some embodiments. Specifically, FIG. 7A illustrates a first exemplary pattern 700 for the fifth extended DMRS configuration, and FIG. 7B illustrates a second exemplary pattern 710 for the fifth extended DMRS configuration. As shown in FIG. 7A, in pattern 700, four ports (e.g., ports 0, 1, 2, and 3) are mapped onto a first DMRS symbol 702 using a cyclic shift of 0 (cs0), a cyclic shift of 1 (cs1), a cyclic shift of 2 (cs2), and a cyclic shift of 3 (cs3), respectively. Furthermore, four other ports (e.g., ports 4, 5, 6, and 7) are mapped onto a second DMRS symbol 704 with cs0, cs1, cs2, and cs3, respectively. 7B, in pattern 710, four ports (e.g., ports 0 / 1 / 2 / 3) are mapped onto comb index 0 with cs0, cs1, cs2, and cs3, respectively. Additionally, four other ports (e.g., ports 4 / 5 / 6 / 7) are mapped onto comb index 1 with cs0, cs1, cs2, and cs3, respectively.

[0069] In some embodiments, the sixth extended UL DMRS configuration involves using FD-OCC2 and TD-OCC2 (as in the existing solutions in FIGS. 1A and 1B). The sixth extended UL DMRS configuration also uses TDM to multiplex codewords (CWs) to layer mapping. This involves mapping the first half of a layer to some resource elements and the remaining layers to other resource elements. This TDM operation means that some symbols are used for CW1 and some other symbols are used for CW2. That is, different CWs are used for different layers, e.g., layers 1-4 for CW1 and layers 5-8 for CW2. When four partial DMRS are used, some of the ports are from the first CDM set of four ports and some are from the second CDM set of four ports. In some examples, for a 2L symbol allocation, the DMRS symbols are on symbols 0 and L. Furthermore, the first four (or six depending on DMRS Type 1 or Type 2) data layers are mapped through symbols 1 to L-1, and the second four (or six) data layers are mapped to symbols L+1 to 2L-1.

[0070] In some embodiments, the sixth enhanced UL DMRS configuration may be enabled by RRC signaling, by DCI, or may be determined by whether 8-port uplink transmission is enabled. When the sixth enhanced UL DMRS configuration is used, a PT-RS may be present. Alternatively, the use of an existing 8-port DMRS pattern (e.g., as shown in FIGS. 1A and 1B) or the sixth enhanced UL DMRS configuration may be determined based on the PT-RS configuration and / or the scheduling DCI. For example, if PTRS is enabled and the DCI indicates that the number of DMRS symbols is one, the existing DMRS pattern is used. Or, if PTRS is enabled and the DCI indicates that the number of DMRS symbols is two, the sixth enhanced UL DMRS configuration is used. In some examples, when enabled, the sixth enhanced UL DMRS configuration may be applied for PUSCH scheduled by dynamic grant and / or configured grant.

[0071] In some examples, the FD-OCC in the above configuration may be replaced by FDM or cyclic shift-based operation for larger subcarrier spacing (SCS), e.g., 960 (kilohertz) kHz, 480 kHz, which may be configured by the base station or determined based on the SCS.

[0072] In some embodiments, the seventh extended UL DMRS configuration involves enabling TD-OCC (e.g., the second half of the DMRS port or the second symbol of the DMRS) for some PTRS patterns. In one example, for a PTRS with a time-domain pattern of every other symbol or every fourth symbol, the second symbol DMRS may be enabled. In some examples, an RRC parameter may be introduced to enable such a configuration, which may be based on UE capabilities. In some examples, this configuration may be applicable to uplink transmissions of eight or more antenna ports.

[0073] In some embodiments, an extended PTRS pattern is used that supports intra-symbol phase noise compensation, e.g., group-based PTRS, where in one symbol, the PTRS is divided into N groups, each group taking M consecutive resource elements, and the N groups are uniformly distributed.

[0074] 8A illustrates a flowchart of an example method 800 according to some embodiments. For clarity of presentation, the following description generally describes the method 800 in the context of other figures in this description. For example, the method 800 may be performed by the UE 202 of FIG. 2. It will be understood that the method 800 may be performed, for example, by any suitable system, environment, software, hardware, or combination of systems, environments, software, and hardware, as appropriate. In some implementations, various steps of the method 800 may be performed in parallel, in combination, in a loop, or in any order.

[0075] In step 802, the method 800 includes determining a frequency division (FD)-based mapping pattern for mapping an uplink (UL) demodulation reference signal (DMRS), where the DMRS is associated with eight antenna ports, to a single orthogonal frequency division multiple access (OFDM) symbol.

[0076] At step 804, the method 800 includes communicating a communication including a resource block including an UL DMRS mapped to a single OFDM symbol using an FD-based mapping pattern.

[0077] In some implementations, the FD-based mapping pattern includes an FD orthogonal cover code of length 4 (FD-OCC4) and two control division multiplexing (CDM) groups.

[0078] In some implementations, communicating a communication including a resource block including an UL DMRS mapped to a single OFDM symbol using an FD-based mapping pattern includes:

number

[0079] In some implementations, k=4n+k'+delta, where delta is selected from the set {0,4} and k' is selected from the set {0,1,2,3}.

[0080] In some implementations, the FD-based mapping pattern includes an FD orthogonal cover code of length 2 (FD-OCC2) and four control division multiplexing (CDM) groups.

[0081] In some implementations, communicating a communication including a resource block including an UL DMRS mapped to a single OFDM symbol using an FD-based mapping pattern includes:

number

[0082] In some implementations, k=4n+k'+delta, where delta is selected from the set {0,2,4,6} and k' is selected from the set {0,1}.

[0083] In some implementations, the communication includes a plurality of resource blocks including the DMRS, and the number of resource blocks in the plurality is an even number.

[0084] In some implementations, determining a frequency division (FD)-based mapping pattern for mapping an uplink (UL) demodulation reference signal (DMRS) includes receiving signaling indicating whether to use a network-specific mapping pattern or a UE-specific mapping pattern.

[0085] In some implementations, the signaling is one of higher layer signaling or downlink control information (DCI).

[0086] In some implementations, the higher layer signaling is one of radio resource control (RRC) signaling or medium access control (MAC) control element (CE).

[0087] In some implementations, the method 800 further includes determining, based on the signaling, to use network-specific mapping, and in response, determining an FD-based mapping pattern based on one of: (i) a reference point and assigned resource block indices for the current active bandwidth portion, or (ii) a common reference point and assigned resource block indices.

[0088] 8B shows a flowchart of an example method 820 according to some embodiments. For clarity of presentation, the following description generally describes the method 820 in the context of other figures in this description. For example, the method 820 may be performed by the UE 202 of FIG. 2. It will be understood that the method 820 may be performed, for example, by any suitable system, environment, software, hardware, or combination of systems, environments, software, and hardware, as appropriate. In some implementations, various steps of the method 820 may be performed in parallel, in combination, in a loop, or in any order.

[0089] In step 822, the method 820 includes determining a time division multiplexing (TDM)-based mapping pattern for mapping an uplink (UL) demodulation reference signal (DMRS), where the DMRS is classified into multiple control division multiplexing (CDM) groups, to a DMRS symbol, where the mapping pattern uses TDM to multiplex the multiple CDM groups in the DMRS symbol.

[0090] At step 824, the method 820 includes communicating a communication including a resource block including an UL DMRS mapped to a DMRS symbol using a TDM-based mapping pattern.

[0091] In some implementations, communicating a communication including a resource block including an UL DMRS mapped to a DMRS symbol using a TDM-based mapping pattern includes mapping each of a plurality of CDM groups to a separate DMRS symbol.

[0092] In some implementations, the plurality of CDM groups includes four CDM groups and the DMRS symbols includes two DMRS symbols.

[0093] In some implementations, two of the four CDM groups are mapped to each DMRS symbol.

[0094] In some implementations, the plurality of CDM groups includes six CDM groups and the DMRS symbols includes two DMRS symbols.

[0095] In some implementations, three of the six CDM groups are mapped to each DMRS symbol.

[0096] 9 illustrates a UE 900 according to some embodiments. The UE 900 may be similar to and substantially interchangeable with the UE 202 of FIG.

[0097] The UE900 may be any mobile or non-mobile computing device, such as a mobile phone, a computer, a tablet, an industrial wireless sensor (e.g., a microphone, a carbon dioxide sensor, a pressure sensor, a humidity sensor, a thermometer, a motion sensor, an accelerometer, a laser scanner, a fluid level sensor, an inventory sensor, a voltage / current meter, an actuator, etc.), a video surveillance / monitoring device (e.g., a camera, a video camera, etc.), a wearable device (e.g., a smart watch), a relaxed-IoT device, etc.

[0098] The UE 900 may include a processor 902, RF interface circuitry 904, memory / storage 906, a user interface 908, sensors 910, driver circuitry 912, a power management integrated circuit (PMIC) 914, one or more antenna structures 916, and a battery 918. The components of the UE 900 may be implemented as an integrated circuit (IC), portions thereof, discrete electronic devices or other modules, logic, hardware, software, firmware, or a combination thereof. The block diagram of FIG. 9 is intended to illustrate a high-level view of some of the components of the UE 900. However, some of the components shown may be omitted, additional components may be present, and different arrangements of the components shown may occur in other embodiments.

[0099] The components of UE900 may be coupled to various other components via one or more interconnects 920, which may represent any type of interface, input / output, bus (local, system or expansion), transmission line, trace, optical connection, etc. that may allow various circuit components (on a common or different chips or chipsets) to interact with one another.

[0100] The processor 902 may include processor circuitry such as, for example, a baseband processor circuit (BB) 922A, a central processing unit circuit (CPU) 922B, and a graphics processing unit circuit (GPU) 922C. The processor 902 may include any type of circuitry or processor circuitry that executes or runs computer-executable instructions, such as program code, software modules, or functional processes from memory / storage 906 to cause the UE 900 to perform the operations described herein.

[0101] In some embodiments, the processor 902 may be configured to determine a frequency division (FD)-based mapping pattern for mapping an uplink (UL) demodulation reference signal (DMRS), the DMRS being associated with eight antenna ports, to a single orthogonal frequency division multiple access (OFDM) symbol. Additionally and / or alternatively, the processor 902 may be configured to generate a communication including a resource block comprising a single OFDM symbol using the FD-based mapping pattern.

[0102] In some embodiments, the processor 902 may be configured to determine a time division multiplexing (TDM)-based mapping pattern for mapping an uplink (UL) demodulation reference signal (DMRS), the DMRS being grouped into multiple control division multiplexing (CDM) groups, to a DMRS symbol, the mapping pattern using TDM to multiplex the multiple CDM groups in the DMRS symbol. Additionally and / or alternatively, the processor 902 may be configured to generate a communication including a resource block including the DMRS symbol using the TDM-based mapping pattern.

[0103] In some embodiments, the baseband processor circuit 922A may access a communications protocol stack 924 in the memory / storage 906 to communicate over a 3GPP-compliant network. Generally, the baseband processor circuit 922A may access the communications protocol stack to perform user plane functions at the PHY, MAC, RLC, PDCP, SDAP, and PDU layers, and control plane functions at the PHY, MAC, RLC, PDCP, RRC, and non-access layers. In some embodiments, PHY layer operations may additionally / alternatively be performed by components of the RF interface circuit 904. The baseband processor circuit 922A may generate or process baseband signals or waveforms that carry information within a 3GPP-compliant network. In some embodiments, waveforms for NR may be based on cyclic prefix OFDM ("CP-OFDM") in the uplink or downlink and discrete Fourier transform spread OFDM ("DFT-S-OFDM") in the uplink.

[0104] The memory / storage 906 may include one or more non-transitory computer-readable media (e.g., communication protocol stack 924) that include instructions that may be executed by one or more of the processors 902 to cause the UE 900 to perform various operations described herein. The memory / storage 906 includes any type of volatile or non-volatile memory that may be distributed throughout the UE 900. In some embodiments, some of the memory / storage 906 may be located within the processor 902 itself (e.g., L1 and L2 caches), while other memory / storage 906 is external to the processor 902 but accessible via a memory interface. The memory / storage 906 may include any suitable volatile or non-volatile memory, such as, without limitation, dynamic random access memory (DRAM), static random access memory (SRAM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), flash memory, solid-state memory, or any other type of memory device technology.

[0105] The RF interface circuitry 904 may include transceiver circuitry and a radio frequency front end module (RFEM) that enable the UE 900 to communicate with other devices over a radio access network. The RF interface circuitry 904 may include various elements disposed in the transmit or receive paths. These elements may include, for example, switches, mixers, amplifiers, filters, combiner circuits, control circuits, etc.

[0106] In the receive path, the RFEM may receive radiated signals from the air interface via antenna 916 and filter and amplify the signals (using a low noise amplifier). The signals may be provided to a transceiver receiver that downconverts the RF signals to baseband signals that are provided to a baseband processor in processor 902.

[0107] On the transmit path, the transmitter of the transceiver upconverts the baseband signal received from the baseband processor and provides an RF signal to the RFEM, which may amplify the RF signal with a power amplifier before radiating the signal across the air interface via the antenna 916.

[0108] In various embodiments, the RF interface circuitry 904 may be configured to transmit / receive signals in a manner compliant with an NR access technology.

[0109] The antenna 916 may include antenna elements that convert electrical signals into radio waves for transmission through the air and convert received radio waves into electrical signals. The antenna elements may be arranged in one or more antenna panels. The antenna 916 may have antenna panels that are omnidirectional, directional, or a combination thereof to enable beamforming and multiple-input, multiple-output communications. The antenna 916 may include microstrip antennas, printed antennas fabricated on the surface of one or more printed circuit boards, patch antennas, phased array antennas, etc. The antenna 916 may have one or more panels designed for a specific frequency band, including bands in FR1 or FR2.

[0110] The user interface circuitry 908 includes various input / output (I / O) devices designed to enable user interaction with the UE 900. The user interface 908 includes input device circuitry and output device circuitry. The input device circuitry includes any physical or virtual means for accepting input, including, among other things, one or more physical or virtual buttons (e.g., a reset button), a physical keyboard, a keypad, a mouse, a touchpad, a touchscreen, a microphone, a scanner, a headset, etc. The output device circuitry includes any physical or virtual means for displaying or otherwise communicating information, such as sensor readings, actuator position(s), or other similar information. The output device circuitry may include any number or combination of audio or visual displays, including, among other things, one or more simple visual outputs / indicators (e.g., binary status indicators such as light emitting diodes "LEDs" and multi-character visual outputs), or more complex outputs such as display devices or touch screens (e.g., liquid crystal displays "LCDs," LED displays, quantum dot displays, projectors, etc.), and output such as text, graphics, multimedia objects, etc. generated or created from operation of the UE900.

[0111] Sensors 910 may include devices, modules, or subsystems intended to detect events or changes in the environment and transmit information about the detected events (sensor data) to some other device, module, subsystem, etc. Examples of such sensors include, among others, inertial measurement units including accelerometers, gyroscopes, or magnetometers; microelectromechanical systems or nanoelectromechanical systems including 3-axis accelerometers, 3-axis gyroscopes, or magnetometers; level sensors; flow sensors; temperature sensors (e.g., thermistors); pressure sensors; barometric pressure sensors; gravimeters; altimeters; image capture devices (e.g., cameras or lensless apertures); light detection and ranging sensors; proximity sensors (e.g., infrared detectors, etc.); depth sensors; ambient light sensors; ultrasonic transceivers, microphones, or other similar audio capture devices, etc.

[0112] The driver circuitry 912 may include software and hardware elements that operate to control particular devices embedded in, attached to, or otherwise communicatively coupled to the UE 900. The driver circuitry 912 may include individual drivers that enable other components to interact with or control various input / output (I / O) devices that may be present in or connected to the UE 900. For example, the driver circuitry 912 may include a display driver for controlling and allowing access to a display device, a touchscreen driver for controlling and allowing access to a touchscreen interface, a sensor driver for obtaining sensor readings of sensors and controlling and allowing access to sensors, a driver for obtaining actuator positions of or controlling and allowing access to electromechanical components, a camera driver for controlling and allowing access to an embedded image capture device, and an audio driver for controlling and allowing access to one or more audio devices.

[0113] The PMIC 914 may manage the power provided to various components of the UE 900. In particular, with respect to the processor 902, the PMIC 914 may control power source selection, voltage scaling, battery charging, or DC-DC conversion.

[0114] In some embodiments, the PMIC 914 may control or otherwise be a part of various power saving mechanisms of the UE 900, including the DRX discussed herein. The battery 918 may power the UE 900, although in some examples, the UE 900 may be mounted or located in a fixed location and may have a power source coupled to a power grid. The battery 918 may be a lithium-ion battery, a metal-air battery such as a zinc-air battery, an aluminum-air battery, a lithium-air battery, or the like. In some implementations, such as in vehicle-based applications, the battery 918 may be a typical automotive lead-acid battery.

[0115] 10 illustrates an access node 1000 (e.g., a base station or a gNB) according to some embodiments. The access node 1000 may be similar to, and substantially interchangeable with, the base station 204. The access node 1000 may include a processor 1002, RF interface circuitry 1004, a core network (CN) interface circuitry 1006, memory / storage circuitry 1008, and one or more antennas 1010.

[0116] The components of the access node 1000 may be coupled to various other components via one or more interconnects 1012. The processor 1002, RF interface circuitry 1004, memory / storage circuitry 1008 (including a communications protocol stack 1014), one or more antennas 1010, and interconnect 1012 may be similar to the like-named elements shown and described with respect to Figure 9. For example, the processor 1002 may include processor circuits such as a baseband processor circuit (BB) 1016A, a central processing unit circuit (CPU) 1016B, and a graphics processing unit circuit (GPU) 1016C.

[0117] In some embodiments, the processor 1002 is configured to generate signaling indicating to the UE the extended UL DMRS configuration to use. The access node 1000 may then communicate the signaling via the RF interface circuitry 1004. In some embodiments, the energy per resource element (EPRE) ratio between the PUSCH and the DMRS within a symbol may be determined based on the number of CDM groups with no data in the symbol. Such an embodiment maintains consistent transmit power across the symbol. In a first option, the access node 1000 indicates via the DCI the total number of CDM groups across the symbol. In a second option, the access node 1000 indicates via the DCI the total number of CDM groups per DMRS symbol.

[0118] In some embodiments, the processor 1002 is configured to generate signaling instructing the UE to use a network-specific mapping pattern or a UE-specific mapping pattern. The access node 1000 may then communicate the signaling via the RF interface circuitry 1004. In some examples, the signaling may be higher layer signaling or downlink control information (DCI). In some examples, the higher layer signaling is one of radio resource control (RRC) signaling or media access control (MAC) control element (CE).

[0119] In some embodiments, the processor 1002 is configured to process a communication received from a UE. The communication includes a resource block including an UL DMRS mapped to a single OFDM symbol. The UL DMRS may be mapped using a frequency division (FD)-based mapping pattern for mapping the UL DMRS to a single orthogonal frequency division multiplexing (OFDM) symbol, where the DMRS is associated with eight antenna ports. Alternatively, the UL DMRS may be mapped using a time division multiplexing (TDM)-based mapping pattern for mapping the UL DMRS to a DMRS symbol, where the DMRS is grouped into multiple control division multiplexing (CDM) groups, and the mapping pattern uses TDM to multiplex the multiple CDM groups in the DMRS symbol.

[0120] The CN interface circuit 1006 may provide connectivity to a core network, e.g., a fifth-generation core network (5GC), using a 5GC-compliant network interface protocol, such as a Carrier Ethernet protocol or some other suitable protocol. Network connectivity may be provided to / from the access node 1000 via optical fiber or wireless backhaul. The CN interface circuit 1006 may include one or more dedicated processors or FPGAs for communicating using one or more of the aforementioned protocols. In some implementations, the CN interface circuit 1006 may include multiple controllers for providing connectivity to other networks using the same or different protocols.

[0121] As used herein, the terms “access node,” “access point,” etc. may refer to equipment that provides wireless baseband functionality for data and / or voice connectivity between a network and one or more users. These access nodes may be referred to as BSs, gNBs, RAN nodes, eNBs, NodeBs, RSUs, TRxPs, TRPs, etc., and may include terrestrial stations (e.g., terrestrial access points) or satellite stations that provide coverage within a geographic area (e.g., a cell). As used herein, the terms “NG RAN node” etc. may refer to an access node 1000 operating in an NR or 5G system (e.g., gNB), and the term “E-UTRAN node” may refer to an access node 1000 operating in an LTE or 4G system (e.g., eNB). According to various implementations, the access node 1000 may be implemented as one or more of a macrocell base station and / or a dedicated physical device such as a femtocell, picocell, or other similar cell having a smaller coverage area, lower user capacity, or higher bandwidth compared to a macrocell.

[0122] In some implementations, all or a portion of the access node 1000 may be implemented as one or more software entities running on a server computer as part of a virtual network, which may be referred to as a CRAN and / or a virtual baseband unit pool (vBBUP). In these embodiments, the CRAN or vBBUP may implement RAN function splitting, such as PDCP splitting, where the RRC and PDCP layers are operated by the CRAN / vBBUP and other L2 protocol entities are operated by the access node 1000; MAC / PHY splitting, where the RRC, PDCP, RLC, and MAC layers are operated by the CRAN / vBBUP and the PHY layer is operated by the access node 1000; or "lower PHY" splitting, where the RRC, PDCP, RLC, MAC, and upper portions of the PHY layer are operated by the CRAN / vBBUP and the lower portion of the PHY layer is operated by the access node 1000.

[0123] In a V2X scenario, the access node 1000 may be or operate as an RSU. The term "Road Side Unit" or "RSU" may refer to any transportation infrastructure entity used for V2X communications. The RSU may be implemented in or by an appropriate RAN node or a stationary (or relatively stationary) UE, and an RSU implemented in or by a UE may be referred to as a "UE-type RSU," an RSU implemented in or by an eNB may be referred to as an "eNB-type RSU," an RSU implemented in or by a gNB may be referred to as a "gNB-type RSU," etc.

[0124] In the description herein, for convenience, various components may be described as performing a task or tasks. Such descriptions should be construed to include the phrase "configured to." It is expressly intended that a description of a component being configured to perform one or more tasks does not invoke 35 U.S.C. 112(f) interpretation with respect to that component.

[0125] For one or more embodiments, at least one of the components depicted in one or more of the foregoing figures may be configured to perform one or more operations, techniques, processes, or methods as described herein. For example, the baseband circuitry described above in connection with one or more of the foregoing figures may be configured to operate according to one or more of the examples described herein. As another example, circuitry associated with a UE, a base station, a network element, etc., as described above in connection with one or more of the foregoing figures, may be configured to operate according to one or more of the examples described herein.

[0126] Example

[0127] Further exemplary embodiments are presented in the following sections.

[0128] Example 1 includes a method that includes determining a frequency division (FD) based mapping pattern for mapping an uplink (UL) demodulation reference signal (DMRS), the DMRS being associated with eight antenna ports, to a single orthogonal frequency division multiple access (OFDM) symbol, and communicating a communication that includes a resource block that includes the UL DMRS mapped to the single OFDM symbol using the FD-based mapping pattern.

[0129] Example 2 is the method according to Example 1, in which the FD-based mapping pattern includes an FD orthogonal cover code of length 4 (FD-OCC4) and two control division multiplexing (CDM) groups.

[0130] Example 3 is the method according to example 1 or 2, wherein communicating the communication including a resource block including an UL DMRS mapped to a single OFDM symbol using an FD-based mapping pattern comprises:

number

[0131] Example 4 is the method of example 3, wherein k=4n+k'+delta, where delta is selected from the set {0,4}, and k' is selected from the set {0,1,2,3}.

[0132] Example 5 is the method according to Example 1, in which the FD-based mapping pattern includes an FD orthogonal cover code of length 2 (FD-OCC2) and four control division multiplexing (CDM) groups.

[0133] Example 6 is the method according to Example 1 or 5, wherein communicating the communication including a resource block including an UL DMRS mapped to a single OFDM symbol using an FD-based mapping pattern comprises:

number

[0134] Example 7 is the method of example 6, wherein k=4n+k'+delta, where delta is selected from the set {0,2,4,6}, and k' is selected from the set {0,1}.

[0135] Example 8 is the method according to any one of Examples 1 to 7, wherein the communication includes a plurality of resource blocks including the DMRS, and the number of the plurality of resource blocks is an even number.

[0136] Example 9 is the method of any of Examples 1 to 8, wherein determining a frequency division (FD) based mapping pattern for mapping an uplink (UL) demodulation reference signal (DMRS) includes receiving signaling indicating whether to use a network-specific mapping pattern or a UE-specific mapping pattern.

[0137] Example 10 is the method according to Example 9, wherein the signaling is one of higher layer signaling or downlink control information (DCI).

[0138] Example 11 is the method according to Example 9 or 10, wherein the higher layer signaling is one of radio resource control (RRC) signaling or media access control (MAC) control element (CE).

[0139] Example 12 is the method of any of Examples 9 to 11, further comprising: determining, based on the signaling, to use network-specific mapping; and, in response thereto, determining an FD-based mapping pattern based on one of (i) a reference point and an assigned resource block index for the current active bandwidth portion, or (ii) a common reference point and an assigned resource block index.

[0140] Example 13 includes a method including: determining a time division multiplexing (TDM) based mapping pattern for mapping an uplink (UL) demodulation reference signal (DMRS), the DMRS being grouped into a plurality of control division multiplexing (CDM) groups, to a DMRS symbol, the mapping pattern using TDM to multiplex the plurality of CDM groups in the DMRS symbol; and generating a communication including a resource block including the UL DMRS mapped to the DMRS symbol using the TDM based mapping pattern.

[0141] Example 14 is the method of Example 13, in which communicating the communication including resource blocks including UL DMRS mapped to DMRS symbols using a TDM-based mapping pattern includes mapping each of a plurality of CDM groups to a separate DMRS symbol.

[0142] Example 15 is the method according to example 13 or 14, wherein the plurality of CDM groups includes four CDM groups and the DMRS symbols includes two DMRS symbols.

[0143] Example 16 is the method according to any one of Examples 13 to 15, wherein two of the four CDM groups are mapped to each DMRS symbol.

[0144] Example 17 is the method of any of Examples 13 to 16, wherein the plurality of CDM groups includes six CDM groups and the DMRS symbols includes two DMRS symbols.

[0145] Example 18 is the method according to any one of Examples 13 to 17, wherein three of the six CDM groups are mapped to each DMRS symbol.

[0146] Example 19 may include one or more non-transitory computer-readable media containing instructions that, when executed by one or more processors of an electronic device, cause the electronic device to perform one or more elements of a method described or a related method of any of Examples 1 through 18, or any other method or process described herein.

[0147] Example 20 may include an apparatus comprising logic, modules, or circuitry for performing one or more elements of the method described or related to any of Examples 1 to 18, or any other method or process described herein.

[0148] Example 21 may include any method, technique, or process described in or related to any of Examples 1-18, or any portion or part thereof.

[0149] Example 22 may include an apparatus comprising one or more processors and one or more computer-readable media comprising instructions that, when executed by the one or more processors, cause the one or more processors to perform a method, technique, or process related thereto, or portions thereof, as set forth in any of Examples 1 to 18.

[0150] Example 23 may include a signal described in or related to any of Examples 1 to 18, or a portion or part thereof.

[0151] Example 24 may include an information element, packet, frame, segment, PDU, or message described in or relating to, or being a part or portion of, any of Examples 1 to 18, or described in the present disclosure.

[0152] Example 25 may include a signal encoded with data described in or relating to, or being a part or portion of, any of Examples 1 to 18, or described in this disclosure.

[0153] Example 26 may include a signal encoded with an IE, packet, frame, segment, PDU, or message described in or relating to any of Examples 1 to 18, or a part or portion thereof, or described in this disclosure.

[0154] Example 27 may include an electromagnetic signal carrying computer-readable instructions, the execution of which by one or more processors causes the one or more processors to perform a method, technique, or process described in, related to, or a portion of any of Examples 1 to 18.

[0155] Example 28 may include a computer program comprising instructions, the execution of which by a processing element causes the processing element to perform a method, technique, or process described in or related to or a portion of any of Examples 1 to 18.

[0156] Example 29 may include a method of communicating in a wireless network as shown and described herein.

[0157] Example 30 may include a system for providing wireless communication as shown and described herein.

[0158] Example 31 may include a device for providing wireless communication as shown and described herein.

[0159] Any of the above examples can be combined with any other example (or combination of examples) unless otherwise stated. The foregoing description of one or more implementations provides illustration and description, but is not intended to be exhaustive or to limit the scope of the embodiments to the precise form disclosed. Modifications and variations are possible in light of the above teachings or may be acquired from practice of various embodiments.

[0160] Although the above embodiments have been described in considerable detail, numerous variations and modifications will become apparent to those skilled in the art once the above disclosure is fully appreciated, and it is intended that the following claims be interpreted to embrace all such variations and modifications.

[0161] It is understood that use of personally identifiable information should comply with generally recognized privacy policies and practices that meet or exceed industry or government requirements for maintaining user privacy. In particular, personally identifiable information data should be managed and handled in a manner that minimizes the risk of unintended or unauthorized access or use, and the nature of authorized uses should be clearly indicated to users.

Claims

1. It is a device, Memory and One or more baseband processors coupled to the memory, which execute instructions stored in the memory, An uplink (UL) demodulated reference signal (DMRS), the ULDMRS being associated with eight antenna ports, and determining a frequency division (FD) based mapping pattern for mapping the ULDMRS to orthogonal frequency division multiple access symbol (OFDM) symbols, The following formula is used to generate the UL DMRS for the resource elements in the OFDM symbol: [Math 1] In the formula, k represents the subcarrier index, l represents the symbol index, p represents the antenna port index, u represents the subcarrier interval scaling factor, w l (l') represents the time-division (TD) sequence, w f (k') represents the FD sequence, and r represents the basic DMRS sequence. Using the aforementioned FD-based mapping pattern, a resource block is generated that includes the UL DMRS mapped to the OFDM symbol, One or more baseband processors configured to cause the device to perform operations including, A device equipped with the following features.

2. The apparatus according to claim 1, wherein the FD-based mapping pattern includes an FD-orthogonal cover code (FD-OCC4) of length 4 and two control division multiplexing (CDM) groups.

3. The apparatus according to claim 1, wherein k = 4n + k' + delta, where delta is selected from the set {0, 4} and k' is selected from the set {0, 1, 2, 3}.

4. The apparatus according to claim 1, wherein the FD-based mapping pattern includes an FD-orthogonal cover code (FD-OCC2) of length 2 and four CDM groups.

5. The operation further includes: To determine a second FD-based mapping pattern for mapping a second UL DMRS associated with eight antenna ports to a second OFDM symbol, The second ULDMRS for the resource element in the second OFDM symbol is generated using the following formula: [Math 2] In the formula, k² represents the second subcarrier index, l² represents the second symbol index, p² represents the second antenna port index, u² represents the second subcarrier interval scaling factor, wl(l'²) represents the second TD sequence, wf(k'²) represents the second FD sequence, and r(2n + k'²) represents the second basic DMRS sequence. A resource block containing the second UL DMRS mapped to the second OFDM symbol is generated using the second FD-based mapping pattern, The apparatus according to claim 1, including the following:

6. The apparatus according to claim 5, wherein k2 = 4n + k'2 + delta, where delta is selected from the set {0, 2, 4, 6} and k'2 is selected from the set {0, 1}.

7. The apparatus according to claim 1, wherein the operation further comprises using a plurality of resource blocks to generate the transmission of the UL DMRS, the number of the plurality of resource blocks being even.

8. Determining the FD-based mapping pattern for mapping the ULDMRS is: The apparatus according to claim 1, comprising receiving a signaling indicating whether to use a network-specific mapping pattern or a UE-specific mapping pattern.

9. The apparatus according to claim 8, wherein the signaling is one of upper-layer signaling or downlink control information (DCI).

10. The apparatus according to claim 9, wherein the upper layer signaling is one of radio resource control (RRC) signaling or media access control (MAC) control elements (CE).

11. The aforementioned operation is, Based on the aforementioned signaling, it is decided to use the network-specific mapping, The apparatus according to claim 8, further comprising: (i) determining the FD-based mapping pattern based on a reference point and an allocated resource block index for the current active bandwidth portion, or (ii) a common reference point and the allocated resource block index.

12. It is a device, Memory and One or more baseband processors coupled to the memory, which, when executing an instruction stored in the memory, the device, An uplink (UL) demodulation reference signal (DMRS), wherein the ULDMRS is classified into a plurality of controlled division multiplexing (CDM) groups, and a time-division multiplexing (TDM) based mapping pattern for mapping the DMRS to a DMRS symbol is determined, wherein the mapping pattern determines a TDM-based mapping pattern that uses TDM to multiplex the plurality of CDM groups in the DMRS symbol. Using the TDM-based mapping pattern, generate a resource block containing the UL DMRS mapped to the DMRS symbol, A device comprising one or more baseband processors configured to perform operations including those mentioned above.

13. Using the TDM-based mapping pattern, generating a resource block containing the UL DMRS mapped to the DMRS symbol is: The apparatus according to claim 12, comprising mapping each of the plurality of CDM groups to an individual DMRS symbol.

14. The apparatus according to claim 12, wherein the plurality of CDM groups include four CDM groups, and the DMRS symbols include two DMRS symbols.

15. The apparatus according to claim 14, wherein two of the four CDM groups are mapped to each DMRS symbol.

16. The apparatus according to claim 12, wherein the plurality of CDM groups include six CDM groups, and the DMRS symbols include two DMRS symbols.

17. The apparatus according to claim 16, wherein three of the six CDM groups are mapped to each DMRS symbol.

18. It is a method, An uplink (UL) demodulated reference signal (DMRS), the ULDMRS being associated with eight antenna ports, for determining a frequency division (FD) based mapping pattern for mapping the DMRS to orthogonal frequency division multiple access symbol (OFDM) symbols, The following formula is used to generate the UL DMRS for the resource elements in the OFDM symbol: [Math 3] In the formula, k represents the subcarrier index, l represents the symbol index, p represents the antenna port index, u represents the subcarrier interval scaling factor, w l (l') represents the time-division (TD) sequence, w f (k') represents the FD sequence, and r represents the basic DMRS sequence. Using the aforementioned FD-based mapping pattern, a resource block is generated that includes the UL DMRS mapped to the OFDM symbol, Methods that include...

19. The method according to claim 18, wherein the FD-based mapping pattern includes an FD-orthogonal cover code (FD-OCC4) of length 4 and two control division multiplexing (CDM) groups.

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