Systems and methods for dmrs port configuration and indication

Abstract

Systems and methods for demodulation reference signal (DMRS) port configuration and indication are provided. A wireless communication device can receive a message from a wireless communication node including an indication. The indication can be used to indicate a number of DMRS ports associated with an orthogonal cover code (OCC) in a code division multiplexing (CDM) group mapped over a plurality of non-contiguous resources.

Description

[0001] This application is a divisional application. The original application has the application number 202280038565.1 and the original application date is January 28, 2022. The entire contents of the original application are incorporated herein by reference. Technical Field

[0002] This disclosure relates generally to wireless communications, including but not limited to systems and methods for configuring and indicating DMRS (demodulation reference signal) ports. Background Technology

[0003] The standards organization Third Generation Partnership Project (3GPP) is currently working on specifying a new radio interface called 5G New Radio (5G NR) and the Next Generation Packet Core Network (NG-CN or NGC). 5G NR will have three main components: the 5G Access Network (5G-AN), the 5G Core Network (5GC), and User Equipment (UE). To facilitate the implementation of different data services and needs, the elements of the 5GC (also known as Network Functions) have been simplified, with some of these elements being software-based, allowing them to be adapted as needed. Summary of the Invention

[0004] The exemplary embodiments disclosed herein are intended to address problems related to one or more of the problems presented in the prior art and provide additional features that will become apparent when taken into account in conjunction with the following drawings and by reference to the following detailed description. Exemplary systems, methods, apparatuses, and computer program products are disclosed herein according to various embodiments. However, it is to be understood that these embodiments are presented by way of example only and are not restrictive, and it will be apparent to those skilled in the art who have read this disclosure that various modifications can be made to the disclosed embodiments while remaining within the scope of this disclosure.

[0005] At least one aspect relates to a system, method, apparatus, or computer-readable medium applicable to any part of this disclosure. A wireless communication device may receive a message including an indication from a wireless communication node. This indication may be used to indicate multiple demodulation reference signal (DMRS) ports associated with an orthogonal cover code (OCC) in a code division multiplex (CDM) group mapped over multiple non-contiguous resources.

[0006] In some implementations, the wireless communication device may receive length-modulated DMRS according to OCC from the wireless communication node. In some cases, the wireless communication device may transmit length-modulated DMRS according to OCC to the wireless communication node. In some implementations, OCC may be applied to at least one of the following: including at least two sets of resource elements in the plurality of discontinuous resources, wherein the at least two sets of resource elements are discontinuous relative to each other; including at least two sets of orthogonal frequency division multiplexing (OFDM) symbols in the plurality of discontinuous resources, wherein the at least two sets of OFDM symbols are discontinuous relative to each other; including at least two resource elements in the plurality of discontinuous resources, wherein the at least two resource elements are discontinuous relative to each other; or including at least two OFDM symbols in the plurality of discontinuous resources, wherein the at least two OFDM symbols are discontinuous relative to each other.

[0007] In some implementations, the resources in each of the at least two groups may be contiguous with respect to each other. The resources may include at least one of the following: resource elements; or OFDM symbols. In some cases, an OOC with a length of 4 may include at least one of the following: [1,1,1,1]; [1,1,-1,-1]; [1,-1,1,-1]; or [1,-1,-1,1]. In some implementations, the plurality of DMRS ports associated with the OCC of length 4 may be co-scheduled with the DMRS port associated with an OCC of length 2 via at least one of the following: the OCC of length 2 may be [1,1], and the OCC of length 4 may be [1,-1,1,-1] or [1,-1,-1,1]; or the OCC of length 2 may be [1,-1], and the OCC of length 4 may be [1,1,1,1] or [1,1,-1,-1].

[0008] In some implementations, when the DMRS is on a single Orthogonal Frequency Division Multiplexing (OFDM) symbol, multiple DMRS ports in a CDM group can have up to four DMRS ports across four resource elements (REs). When the DMRS is on two consecutive OFDM symbols, multiple DMRS ports in a CDM group can have up to eight DMRS ports across eight REs. For DMRS type-1 on an OFDM symbol of the DMRS, the Code Division Multiplexing (CDM) group can be mapped across at least two resource blocks (RBs).

[0009] In some cases, the at least two RBs may include at least one of the following: at least two consecutive physical RBs; at least two consecutive virtual RBs; or at least two RBs, each of which comes from a consecutively scheduled physical RB. In some implementations, for DMRS type-1 on an Orthogonal Frequency Division Multiplexing (OFDM) symbol of DMRS, the number of resource blocks (RBs) for a consecutively scheduled operation in the frequency domain may be even. In some instances, a first wireless communication device supporting an OCC of length 2 and a second wireless communication device supporting an OCC of length 4 may be scheduled on different subsets of DMRS ports within a Code Division Multiplexing (CDM) group.

[0010] In some implementations, a first wireless communication device supporting an OCC length of 2 and a second wireless communication device supporting an OCC length of 4 can be scheduled using at least one different value of OCC on the first two RE ports in a Code Division Multiplexing (CDM) group. In some cases, the OCC length can be 2 and used to modulate DMRS in the first step, and the OCC in the second step can be enabled to modulate the result of the first step. The OCC in the second step can be enabled based on at least one of the following: the total number of DMRS ports is greater than 8 for DMRS type-1 or greater than 12 for DMRS type-2.

[0011] In some implementations, the indication can be conveyed to the wireless communication device via at least one of the following: radio resource control (RRC) signaling, medium access control control element (MAC CE) signaling, or downlink control information (DCI). In some implementations, the indication of the plurality of DMRS ports can be conveyed by the DCI signaling via at least one of the following: an entry in the DMRS port field; a bit in the field; a reserved bit in the DMRS port field; the number of DMRS symbols indicated in the time-domain resource allocation field; the number of physical resource blocks indicated in the frequency-domain resource allocation field; one or more TCI states in the transmission configuration indicator (TCI) field; one or more quasi-co-location (QCL) related parameters; or spatial relationships.

[0012] In some cases, RRC signaling can be configured to: enable the DMRS port applying the OCC within the CDM group mapped on the plurality of discontinuous resources; utilize a downlink transmission scheme of the plurality of DMRS ports to apply the OCC in the CDM group mapped on the plurality of discontinuous resources; or utilize an uplink transmission scheme of the plurality of DMRS ports to apply the OCC in the CDM group mapped on the plurality of discontinuous resources. In some implementations, MAC CE signaling activates at least one of the following: enables the DMRS port applying the OCC within the CDM group mapped on the plurality of discontinuous resources; utilizes a downlink transmission scheme of the plurality of DMRS ports to apply the OCC in the CDM group mapped on the plurality of discontinuous resources; or utilizes an uplink transmission scheme of the plurality of DMRS ports to apply the OCC in the CDM group mapped on the plurality of discontinuous resources.

[0013] In some implementations, the indication may be enabled if it is associated with at least one of the following: an SRS resource indicator (SRI) field or a transmit precoding matrix index (TPMI) field, or if the associated rank is 2, 3, or 4. In some cases, reserved bits in the MAC CE signaling for activating the Transport Configuration Indicator (TCI) state may be configured to indicate at least one DMRS port to apply the OCC in the CDM group mapped on the plurality of non-contiguous resources. In some cases, the plurality of non-contiguous resources may be indicated in the frequency domain or time domain by at least one of the following: an entry in the DMRS port field; a bit in the field; a reserved bit in the DMRS port field; the number of DMRS symbols indicated in the time domain resource allocation field; the number of physical resource blocks indicated in the frequency domain resource allocation field; one or more TCI states in the Transmission Configuration Indicator (TCI) field; one or more Quasi-Co-location (QCL) related parameters; spatial relationships; Radio Resource Control (RRC) states; or a reserved bit in a field of the Media Access Control Element (MAC CE) signaling for activating one or more TCI states.

[0014] At least one aspect relates to a system, method, apparatus, or computer-readable medium applicable to any part of this disclosure. A wireless communication node can determine indications of multiple demodulation reference signal (DMRS) ports associated with orthogonal cover codes (OCCs) in code division multiplexing (CDM) groups mapped over multiple non-contiguous resources. The wireless communication node can transmit a message including this indication to a wireless communication device.

[0015] The systems and methods presented herein include novel approaches for DMRS port configuration and indication. Specifically, the systems and methods presented herein describe a novel solution for modulating DMRS ports. A user equipment (UE) (e.g., a wireless communication device) can receive a demodulation reference signal (DMRS) port indication from a base station (BS) (e.g., a wireless communication node or gNB). Based on the DMRS port indication, the UE can modulate the DMRS port using an orthogonal coverage code (OCC) of length 4 in a CDM group on an Orthogonal Frequency Division Multiplexing (OFDM) symbol. For example, a CDM group can be mapped onto four different resource elements (REs) on an OFDM symbol. The associative allocation of DMRS ports and OCCs can indicate the coexistence or utilization of DMRS ports with OCC lengths of 4 and / or 2. For example, a 4-length OCC can be enabled by at least one of: RRC, MAC CE, and / or DCI. Entries in the DMRS port field can be used to indicate a DMRS port with an OCC of length 4.

[0016] In some implementations, at least one bit in the DCI field can be used to indicate one or more DMRS ports with an OCC length of 4. For example, a reserved bit in the TCI state activated by the MAC CE can be used to enable or indicate an OCC of length 4. In another example, a reserved bit in the DMRS port indication field can be used to indicate a DMRS port with an OCC length of 4. This indication can be associated with a Probe Reference Signal (SRS) Resource Indicator (SRI) field or a Transport Precoding Matrix Index (TPMI) field. The indication can be enabled if the associated rank is indicated as 2, 3, or 4. In some cases, a DMRS CDM group can be mapped across at least two resource blocks (RBs). RBs can be contiguous virtual RBs. RBs for each RB group can be contiguous, where each group can include multiple physical RBs in the frequency domain. In some cases, the number of RBs for each RB group can be even. Attached Figure Description

[0017] Various exemplary embodiments of this solution are described in detail below with reference to the following figures or drawings. These figures are provided for illustrative purposes only and depict only exemplary embodiments of this solution to aid the reader's understanding of it. Therefore, the figures should not be considered as limitations on the breadth, scope, or applicability of this solution. It should be noted that these figures are not necessarily drawn to scale for clarity and ease of explanation.

[0018] Figure 1 An example cellular communication network is shown, which can implement the techniques disclosed herein, according to embodiments of the present disclosure;

[0019] Figure 2 Block diagrams of example base stations and user equipment according to some embodiments of the present disclosure are shown;

[0020] Figure 3 A block diagram is shown illustrating an example of a DMRS type-2 having a front-loaded DMRS symbol according to some embodiments of the present disclosure;

[0021] Figure 4 A block diagram is shown illustrating an example of DMRS type-2 having two preceding DMRS symbols according to some embodiments of the present disclosure;

[0022] Figure 5 A block diagram is shown illustrating an example of DMRS type-2 having one pre-DMRS symbol and two additional DMRS symbols according to some embodiments of the present disclosure;

[0023] Figure 6 A block diagram illustrating an example of a DMRSCDM group having four DMRS ports in a CDM group according to some embodiments of the present disclosure is shown;

[0024] Figure 7 A block diagram is shown of an example of a DMRS CDM group having four DMRS ports on four consecutive REs in a CDM group, according to some embodiments of the present disclosure;

[0025] Figure 8 A block diagram is shown illustrating an example of a DMRS CDM group having 4 DMRS ports in each CDM group for DMRS type-1, according to some embodiments of the present disclosure;

[0026] Figure 9 A block diagram is shown illustrating an example of a DMRS CDM group having four DMRS ports in a CDM group in the time domain, according to some embodiments of the present disclosure;

[0027] Figure 10 A block diagram illustrating an example of a 4-symbol DMRS in a CDM group according to some embodiments of the present disclosure is shown;

[0028] Figure 11 Examples of TCI states in a MAC-CE according to some embodiments of this disclosure are shown;

[0029] Figure 12 Examples of indications of DMRS ports having an OCC length of 4 or 2 are shown according to some embodiments of this disclosure;

[0030] Figure 13A block diagram illustrating an example of TD (time domain)-OCC on a non-continuous OFDM symbol according to some embodiments of the present disclosure is shown;

[0031] Figure 14 A block diagram illustrating an example of a single-symbol DMRS with TD-OCC in consecutive time slots according to some embodiments of the present disclosure is shown; and

[0032] Figure 15 A flowchart illustrating an example method for DMRS port configuration and indication according to an embodiment of this disclosure is shown. Detailed Implementation

[0033] 1. Mobile communication technology and environment

[0034] Figure 1 An example wireless communication network and / or system 100 according to an embodiment of the present disclosure is illustrated, in which the technologies disclosed herein can be implemented. In the following discussion, the wireless communication network 100 can be any wireless network, such as a cellular network or a narrowband Internet of Things (NB-IoT) network, and is referred to herein as "network 100". Such an example network 100 includes base stations 102 (hereinafter referred to as "BS102", also called wireless communication nodes) and user equipment 104 (hereinafter referred to as "UE104", also called wireless communication devices) that can communicate with each other via communication links 110 (e.g., wireless communication channels), and a cluster of cells 126, 130, 132, 134, 136, 138, and 140 covering a geographic area 101. Figure 1 In this context, BS102 and UE 104 are contained within their respective geographical boundaries in cell 126. Each of the other cells 130, 132, 134, 136, 138, and 140 may include at least one base station operating on its allocated bandwidth to provide sufficient radio coverage to its intended users.

[0035] For example, BS102 can operate on the allocated channel transmission bandwidth to provide sufficient coverage to UE 104. BS102 and UE 104 can communicate via downlink radio frame 118 and uplink radio frame 124, respectively. Each radio frame 118 / 124 can also be divided into subframes 120 / 127, which may include data symbols 122 / 128. In this disclosure, BS102 and UE 104 are described herein as "communication nodes," non-limiting examples of methods that can generally be practiced. According to various embodiments of this solution, such communication nodes may be capable of wireless and / or wired communication.

[0036] Figure 2 A block diagram of an example wireless communication system 200 for transmitting and receiving wireless communication signals (e.g., OFDM / OFDMA signals) according to some embodiments of this solution is shown. System 200 may include components and elements configured to support known or conventional operating characteristics that do not need to be described in detail herein. In one illustrative embodiment, system 200 may be used in applications such as... Figure 1 The wireless communication environment 100 is a wireless communication environment in which communication (e.g., sending and receiving) data symbols are as described above.

[0037] System 200 typically includes a base station 202 (hereinafter referred to as "BS202") and a user equipment 204 (hereinafter referred to as "UE204"). BS202 includes a BS (base station) transceiver module 210 (hereinafter also referred to as: BS transceiver 210, transceiver 210), a BS antenna 212 (hereinafter also referred to as: antenna 212), a BS processor module 214 (hereinafter also referred to as: processor module 214), a BS memory module 216 (hereinafter also referred to as: memory module 216), and a network communication module 218. Each module is coupled and interconnected with each other as needed via a data communication bus 220. UE 204 includes a UE (user equipment) transceiver module 230 (hereinafter also referred to as: UE transceiver 230, transceiver 230), a UE antenna 232 (hereinafter also referred to as: antenna 232), a UE memory module 234 (hereinafter also referred to as: memory module 234), and a UE processor module 236. Each module is coupled and interconnected with each other as needed via a data communication bus 240. BS202 communicates with UE204 via communication channel 250, which (hereinafter also referred to as: wireless transmission link 250, wireless data communication link 250) can be any wireless channel or other medium suitable for the data transmission described herein.

[0038] As those skilled in the art will understand, system 200 may also include, in addition to Figure 2 Any number of modules other than those shown. Those skilled in the art will understand that the various illustrative blocks, modules, circuits, and processing logic described in conjunction with the embodiments disclosed herein can be implemented in hardware, computer-readable software, firmware, or any practical combination thereof. To clearly illustrate this interchangeability and compatibility of hardware, firmware, and software, various illustrative components, blocks, modules, circuits, and steps are described in general terms of their functionality. Whether this functionality is implemented as hardware, firmware, or software may depend on the specific application and design constraints imposed on the system as a whole. Those skilled in the art described herein can implement this functionality appropriately for each specific application; however, such implementation decisions should not be construed as limiting the scope of this disclosure.

[0039] According to some embodiments, UE transceiver 230 may be referred to herein as an "uplink" transceiver 230 including a radio frequency (RF) transmitter and an RF receiver, each RF transmitter and RF receiver including circuitry coupled to antenna 232. A duplex switch (not shown) may alternately couple the uplink transmitter or receiver to the uplink antenna in a time-duplex manner. Similarly, according to some embodiments, BS transceiver 210 may be referred herein as a "downlink" transceiver 210 including an RF transmitter and an RF receiver, each RF transmitter and RF receiver including circuitry coupled to antenna 212. A downlink duplex switch may alternatively couple the downlink transmitter or receiver to downlink antenna 212 in a time-division duplex manner. The operation of the two transceiver modules 210 and 230 may be time-coordinated such that the uplink receiver circuitry is coupled to the uplink antenna 232 so that transmissions are received over the wireless transmission link 250 while the downlink transmitter is coupled to the downlink antenna 212. Conversely, the operation of the two transceivers 210 and 230 can be time-coordinated so that the downlink receiver is coupled to the downlink antenna 212, so that transmissions can be received via the wireless transmission link 250 while the uplink transmitter is coupled to the uplink antenna 232. In some embodiments, there is tight time synchronization with a minimum guard time between changes in the duplex direction.

[0040] UE transceiver 230 and base transceiver 210 are configured to communicate via wireless data communication link 250 and cooperate with RF antennas 212 / 232 arranged in a suitable configuration to support specific wireless communication protocols and modulation schemes. In some illustrative embodiments, UE transceiver 230 and base transceiver 210 are configured to support industry standards (such as Long Term Evolution (LTE) and emerging 5G standards). However, it should be understood that this disclosure is not necessarily limited to application to specific standards and associated protocols. Rather, UE transceiver 230 and base transceiver 210 may be configured to support alternative or additional wireless data communication protocols (including future standards or variations thereof).

[0041] According to various embodiments, BS202 may be, for example, an evolved Node B (eNB), a serving eNB, a target eNB, a femtocell, or a picocell. In some embodiments, UE 204 may be implemented in various types of user equipment, such as mobile phones, smartphones, personal digital assistants (PDAs), tablets, laptops, wearable computing devices, etc. Processor modules 214 and 236 may be implemented or realized using a general-purpose processor, content-addressable memory, digital signal processor, application-specific integrated circuit, field-programmable gate array, any suitable programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. In this way, the processor may be implemented as a microprocessor, a controller, a microcontroller, a state machine, etc. The processor may also be implemented as a combination of computing devices, such as a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors combined with a digital signal processor core, or any other combination of such configurations.

[0042] Furthermore, the steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be directly implemented in hardware, firmware, software modules executed by processor modules 214 and 236 respectively, or any practical combination thereof. Memory modules 216 and 234 can be implemented as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. In this regard, memory modules 216 and 234 can be coupled to processor modules 214 and 236 respectively, such that processor modules 214 and 236 can read information from and write information to memory modules 216 and 234 respectively. Memory modules 216 and 234 can also be integrated into their respective processor modules 214 and 236. In some embodiments, memory modules 216 and 234 may each include cache memory for storing temporary variables or other intermediate information during the execution of instructions executed by processor modules 214 and 236 respectively. Memory modules 216 and 234 may each include non-volatile memory for storing instructions executed by processor modules 214 and 236, respectively.

[0043] Network communication module 218 typically represents the hardware, software, firmware, processing logic, and / or other components of base station 202 that enable bidirectional communication between base station transceiver 210 and other network components and communication nodes configured to communicate with base station 202. For example, network communication module 218 may be configured to support Internet or WiMAX services. In a typical deployment, but without limitation, network communication module 218 provides an 802.3 Ethernet interface, enabling base station transceiver 210 to communicate with conventional Ethernet-based computer networks. In this way, network communication module 218 may include a physical interface for connecting to a computer network (e.g., a Mobile Switching Center (MSC)). The terms “configured as,” “configured to,” and their variations, used herein with respect to a specified operation or function, refer to a device, component, circuit, structure, machine, signal, etc., which is physically constructed, programmed, formatted, and / or arranged to perform a specified operation or function.

[0044] The Open Systems Interconnection (OSI) model (referred to herein as the "OSI model") is a conceptual and logical layout that defines network communications used by systems (e.g., wireless communication devices, wireless communication nodes) for interconnecting and communicating with other systems. The model is divided into seven sub-components or layers, each representing a conceptual set of services provided to its upper and lower layers. The OSI model also defines logical networks and efficiently describes computer packet transmission using different layer protocols. The OSI model may also be referred to as the seven-layer OSI model or the seven-layer model. In some embodiments, the first layer may be the physical layer. In some embodiments, the second layer may be the Medium Access Control (MAC) layer. In some embodiments, the third layer may be the Radio Link Control (RLC) layer. In some embodiments, the fourth layer may be the Packet Data Convergence Protocol (PDCP) layer. In some embodiments, the fifth layer may be the Radio Resource Control (RRC) layer. In some embodiments, the sixth layer may be the Non-Access Stratum (NAS) layer or the Internet Protocol (IP) layer, and the seventh layer is other layers.

[0045] Various exemplary embodiments of this solution are described below with reference to the accompanying drawings to enable those skilled in the art to create and use this solution. As will be apparent to those skilled in the art, various changes or modifications can be made to the examples described herein without departing from the scope of this solution after reading this disclosure. Therefore, this solution is not limited to the exemplary embodiments and applications described and illustrated herein. Furthermore, the specific order or hierarchy of steps in the methods disclosed herein is merely exemplary. Based on design preferences, the specific order or hierarchy of steps in the disclosed methods or processes can be rearranged while remaining within the scope of this solution. Therefore, those skilled in the art will understand that the methods and techniques disclosed herein present various steps or actions in an exemplary order, and unless otherwise expressly stated, this solution is not limited to the specific order or hierarchy presented.

[0046] 2. Systems and methods for DMRS port configuration and indication

[0047] In some systems (e.g., 5G New Radio (NR), Next Generation (NG) systems, 3GPP systems, and / or other systems), only 8 and / or 12 Demodulation Reference Signal (DMRS) ports can be supported. With 8 or 12 DMRS ports, a limited number of Resource Elements (REs) can be transmitted between BS102 and UE 104 at a given time (e.g., the number of REs can be the same as the number of DMRS ports). The systems and methods with the technical features discussed herein can support more than 8 or 12 DMRS ports (e.g., 24 ports) for communication between BS102 and UE 104 (e.g., uplink and / or downlink communication). The systems and methods may include new (one or more) DMRS patterns that can be implemented / designed / utilized / configured to support uplink and downlink transmissions via various ports, and the DMRS ports can be indicated / provided to UE 104. By using a new (one or more) DMRS pattern and indicating the DMRS port to UE 104, additional (or more) DMRS ports can be utilized, thereby allowing / enabling BS 102 to transmit a greater number of REs with UE 104 at a given time, thereby improving bandwidth and / or reducing latency by increasing the resources available for a single communication.

[0048] In some systems, artificial intelligence (AI) and machine learning (ML) can be combined in communication networks (e.g., 5G) and used to reduce the overhead of resource elements (REs) used for channel estimation. Using AI-based channel estimation solutions, a small number of demodulation reference signal (DMRS) REs can be provided in specific time slots. In such communication networks, two DMRS types can be supported, such as DMRS type-1 and DMRS type-2. Such AI-based methods can be applied to DMRS type-2. Therefore, more DMRS REs can be repurposed for data transmission, increasing system transmission capacity. For this purpose, new DMRS patterns and associated signaling or mechanisms can be utilized.

[0049] Now for reference Figure 3 A block diagram depicts an example of DMRS type-2 with a pre-signal DMRS symbol. As shown, a DMRS pattern of type-2 DMRS within a PRB (physical resource block) is illustrated, where a pre-signal DMRS symbol can be configured by RRC signaling or indicated by DCI signaling. Two adjacent frequency REs can form a DMRS code division multiplexing (CDM) group. Specifically, DMRS ports 0 and 1 can be multiplexed in CDM group #0. For example, ports 0 and 1 can be multiplexed in CDM mode in RE#0 and RE#1, and ports 0 and 1 can also be multiplexed in CDM mode in RE#6 and RE#7. Therefore, CDM group #0 can be repeated twice, once in RE#0 and RE#1, and again in RE#6 and RE#7. Similar mappings can be used for other DMRS ports. Therefore, in this example, six DMRS ports can be supported in the case of a front-end DMRS symbol, and the density of each DMRS port can be four REs per PRB per symbol.

[0050] Now for reference Figure 4A block diagram depicts an example of DMRS type-2 with two preceding DMRS symbols (e.g., Time Domain (TD)-Orthogonal Coverage Code (OCC)). As shown, a DMRS pattern for DMRS type-2 within a PRB (e.g., a column) is illustrated, where the two preceding DMRS symbols can be configured by Radio Resource Control (RRC) signaling or indicated by DCI signaling. Four adjacent REs can form a DMRS CDM group. Specifically, DMRS ports 0, 1, 6, and 7 can be multiplexed in CDM mode within CDM group #0. Similar mappings can be used for other DMRS ports. In summary, up to 12 DMRS ports can be supported with two preceding DMRS symbols, and the density of each DMRS port can be 8 REs per 2 symbols per PRB. Within a PRB, each CDM group can be mapped twice. For example, CDM group #0 can be mapped onto RE#0, RE#1, and RE#6, RE#7.

[0051] In addition, refer to Figure 5 The diagram depicts an example of DMRS type-2 with one preceding DMRS symbol and two additional DMRS symbols. As shown, in a time slot, one preceding DMRS symbol (e.g., a column) and at least one additional DMRS symbol (e.g., 1 or 2 additional DMRS symbols) can be configured. In this example, DMRS symbols 2, 7, and 11 can be configured. For example, one or more other symbols can be configured in addition to or as alternatives to DMRS symbols 2, 7, and / or 11.

[0052] I. Implementation Method 1

[0053] In some implementations, for uplink (UL) transmissions (e.g., DMRS transmissions from UE 104 to BS 102), UE 104 may receive an indication of the DMRS port from BS 102. UE 104 may modulate (e.g., encode) the DMRS port based on the OCC length in a CDM group on an OFDM symbol (e.g., using an OCC of length 4). For downlink (DL) transmissions (e.g., DMRS received by UE 104 from BS 102), BS 102 may indicate the DMRS port to UE 104. The DMRS port may be modulated (e.g., decoded) based on the OCC length (such as an OCC of length 4 in a CDM group on an OFDM symbol).

[0054] In some cases, a DMRS port may be associated with or related to an OCC in at least one Code Division Multiplexing (CDM) group mapped over various non-contiguous resources. Non-contiguous resources may include / contain at least two non-contiguous resources (e.g., not all resources within the same CDM group are contiguous). Non-contiguous resources may be included in or part of at least two resource groups, wherein the two groups are non-contiguous. In this example, each group may include at least two resources, and the resources within each group may be contiguous.

[0055] Resources may include or correspond to resource elements (REs) in the frequency domain and / or orthogonal frequency division multiplexing (OFDM) symbols with DMRS in the time domain, or a portion of resource elements (REs) in the frequency domain and / or orthogonal frequency division multiplexing (OFDM) symbols with DMRS in the time domain. For example, in the frequency domain, an OCC of length 4 in a CDM group can be mapped to at least RE#0, RE 1, RE 6, and RE 7. In this example, in the case of two groups of REs, the two groups may include RE#0 and RE 1, and RE#6 and RE 7, respectively. Two REs in a corresponding CDM group may be contiguous, and two RE groups may be non-contiguous (e.g., different frequency bands or non-adjacent ports). As discussed herein, non-contiguous RE groups may be referred to as or named non-contiguous resources. An RE group may refer to a continuous string of REs within a corresponding group, and a CDM group may include one or more RE groups, which may be non-contiguous or discontiguous.

[0056] Continuous resources can correspond to or refer to at least two resources in the time domain and / or frequency domain that are marked / indicated / configured / associated with continuous indexes (e.g., RE#0 and RE#1 in the frequency domain or OFDM symbols #2 and #3 in the time domain, which are marked with continuous or consecutive indexes). Non-continuous resources can refer to at least two groups of resources marked with non-continuous or non-consecutive indexes, and one or more other indexes can exist between at least two groups of resources. For example, within each group, resources can be continuous, such as RE#0 and RE#1 in the frequency domain or OFDM symbols #2 and #3 in the time domain. Furthermore, resources can be non-continuous between groups; for example, group 1 may include RE#0 and RE#1 in the frequency domain or OFDM symbols #2 and #3 in the time domain, and group 2 may include RE#6 and RE#7 in the frequency domain or OFDM symbols #8 and #9 in the time domain. In some cases, and in another example, each non-contiguous group within a non-contiguous group may include a resource, where resources between groups may be non-contiguous. Each RE group may include at least one resource in the time domain. For example, the number of OFDM symbols in a single group may be 1 (e.g., one of the DMRS symbols #2 or #9). In the case of two resource groups, at least one RE may be included or occupied in each group, and these two groups may be non-contiguous resources with OCC codes in a CDM group. For example, if the DMRS symbols are #2, #3, #8, and #9, then consecutive symbols may be in one resource group (e.g., RE#2 and RE#3 may be in the first RE group, and RE#8 and RE#9 may be in the second / another group). Two resources in each group (e.g., #2 and #3, or #8 and #9) may be consecutive, where these two groups may not be consecutive (e.g., they may be non-contiguous or discontiguous). In this example, these two resource groups may be associated with an OCC included in a particular CDM group.

[0057] refer to Figure 6A block diagram depicts an example of a DMRS CDM group with four DMRS ports within a CDM group (e.g., frequency domain (FD)-OCC (single column)). For DMRS type-2, when the DMRS is on a single OFDM symbol, the DMRS ports in at least one CDM group can include at least or at most four DMRS ports on four REs (e.g., consecutive or non-consecutive REs within the CDM group). As shown, non-consecutive subcarriers #0, #1, #6, #7 (e.g., four REs of CDM group 0) can be used as a CDM group with four DMRS ports (e.g., as an alternative to two DMRS ports on a single symbol). In this example, as... Figure 6 As shown, for DMRS type-2, three CDM groups can be supported, each having up to 12 DMRS ports supported on one OFDM symbol in the time domain.

[0058] refer to Figure 7 This paper depicts a block diagram of an example DMRS CDM group with four DMRS ports on four consecutive REs within a CDM group. As shown, for a dual-symbol DMRS port, if 12 DMRS ports are supported on a single OFDM symbol, and the dual-symbol DMRS utilizes an OCC length of 2 in the time domain and an OCC in the frequency domain of the two OFDM symbols, then up to or at least 8 DMRS ports can be supported / configured / implemented in a CDM group. Furthermore, as described herein, up to or at least 24 DMRS ports can be supported for a dual-symbol DMRS port.

[0059] For example, when DMRS is on two consecutive OFDM symbols, the DMRS ports in a CDM group can include up to eight DMRS ports on eight REs (e.g., consecutive or non-consecutive REs). In another example, each DMRS port can be mapped to four consecutive REs in a CDM group on one OFDM symbol. At least one design of each type (such as at least in) can be utilized / considered / implemented for DMRS type-1 and / or DMRS type-2. Figures 6 to 7 (as shown in the image).

[0060] refer to Figure 8This diagram illustrates an example of a DMRS CDM group with 4 DMRS ports in each CDM group for DMRS type-1. As shown, for DMRS type-1 on one OFDM symbol, a CDM group can be mapped across at least two resource blocks (RBs) (e.g., each RB may include RE#0 to RE#11, thus being configured as 24 REs associated with 24 DMRS ports). Two adjacent scheduling RBs can be bundled / grouped / coupled for DMRS mapping. In this example, each CDM group may include at least 12 REs (e.g., each of the 4 REs in the respective CDM groups #0 and #1 can use an OCC of length 4). Two CDM groups (e.g., two intermediate CDM groups #0 and #1) can both be mapped onto both scheduling RBs. For example, a DMRS port or a DMRS group can be mapped onto or mapped to RE#8 and RE#10 of the first RB connected to CDM group #0 and RE#0 and RE#2 of the second RB. In this example, the DMRS mapping on the corresponding four REs across multiple RBs can come from a single CDM group. In another example, the DMRS ports can be mapped on REs #9 and REs #11 of the first RB and REs #1 and REs #3 of the second RB from another CDM group (e.g., CDM group #1).

[0061] Therefore, based on Figure 8 The indications or patterns shown indicate that two DMRS CDM groups can be supported on one OFDM symbol, with up to 8 DMRS ports supported on one OFDM symbol, and up to 16 DMRS ports supported for dual-symbol DMRS ports. The number of scheduled RBs for UL and / or DL ​​transmissions can be even. For non-contiguous scheduled RBs (e.g., a portion of REs from one RB and another portion of REs from another RB), if an OCC of length 4 is enabled for DMRS type-1, the number of scheduled RBs for one / each contiguous scheduling (e.g., forming a group of RBs) in the frequency domain can be even. In this case, contiguous scheduling can refer to REs within the same RB, such as the number of REs (e.g., #9 and #11) of the first RB associated with CDM group #1 and the number of REs (e.g., #1 and #3) of the second RB can be even.

[0062] In some implementations, if each group of consecutively scheduled RBs (e.g., RB groups) is odd, a virtual RB (VRB) (e.g., independent of physical mapping) can be used for DMRS port modulation (e.g., encoding or decoding) with an OCC length of 4. A virtual RB can refer to an RB with a virtual consecutive scheduling index scheduled by BS102 (e.g., a transport node). A virtual RB can be mapped onto a physical RB. The index of a VRB can be consecutive and can be mapped onto a PRB with a non-consecutive index. The OCC length can correspond to or be associated with the number of REs within the associated CDM group. For example, when using / utilizing / configuring two groups of scheduled physical RBs (PRBs) to map a DMRS with an OCC length of 4, if the number of RBs in one group is odd, the DMRS of the last RB in that group can be mapped to an RB in the next group (e.g., making both groups of scheduled RBs even). For example, DMRS ports in a CDM group can be mapped across RBs. For instance, DMRS port #0 can be associated with an OCC and mapped to RE#10 and RE#11 of the first PRB and RE#0 and RE#1 of the second PRB.

[0063] refer to Figure 9 This diagram depicts an example of a DMRS CDM group with four DMRS ports in a CDM group in the time domain. When the OCC length is 2, up to 12 DMRS ports can be supported for two front-end symbols (e.g., each symbol may include / have up to 6 DMRS ports). When the OCC length is extended to 4, up to 24 DMRS ports can be supported. For time-domain (TD)-OCC, a CDM group can contain / include or be mapped / linked to more than one symbol in the time domain (e.g., four symbols), such as... Figure 9 As shown. In this example, a DMRS port can be mapped onto the four OFDM symbols of the same RE, regardless of the frequency domain. In some cases, the four OFDM symbols can be continuous or discontinuous / non-continuous in the time domain. Each symbol (e.g., at least in...) Figure 9 Each column shown in the diagram may include / have a corresponding frequency pattern (such as...) Figures 6 to 8 (e.g., the frequency pattern shown in at least one of the figures) (to be decoded).

[0064] refer to Figure 10 A block diagram depicts an example of a 4-symbol DMRS in a CDM group. For DMRS on consecutive OFDM symbols, the DMRS begins to map to any OFDM symbol (e.g., Figure 10 The symbol 0, or in the first group of symbols shown on the left Figure 10The symbol 5 on the second group of symbols shown on the right), three or four consecutive OFDM symbols can be mapped to TD-OCC of length 4, respectively. For example... Figure 10 As shown in the first / left figure, four consecutive OFDM symbols can be used for DMRS mapping, and a TD-OCC of length 4 can be used. Each element of the OCC can represent one OFDM symbol. The TD-OCC of length 4 can be configured / predefined / indicated by BS102. For example, in some cases where only 3 OFDM symbols are supported in a CDM group, a TD-OCC of length 3 can be supported between the 3 OFDM symbols.

[0065] II. Implementation Method 2

[0066] An OCC of length 4 (e.g., a new OCC) can be used to modulate (e.g., encode or decode) a DMRS port in at least one CDM group. The OCC can be used as at least one of an FD-OCC in the frequency domain and / or a TD-OCC in the time domain. In this example, if the OCC of length 4 on each OFDM symbol is configured by Radio Resource Control (RRC) or indicated by a Media Access Control (MAC) control element (MAC CE) or Downlink Control Information (DCI) (e.g., MAC CE / DCI), a new table, as shown in Table 1, can be designed / built / implemented / configured / utilized for the DMRS port. Table 1 can indicate DMRS ports with an FD-OCC of length 4 for both DMRS type-1 and DMRS type-2.

[0067] DMRS port RE-0 RE-1 RE-6 RE-7 0 1 1 1 1 1 1 -1 1 -1 2 1 1 -1 -1 3 1 -1 -1 1

[0068] Table 1

[0069] Each value under RE-0, RE-1, RE-6, and RE-7 may represent / indicate / include the corresponding OCC bit for the DMRS port (e.g., DMRS ports 0 to 3) to be applied to the listed RE. To support the coexistence of a first UE (e.g., UE 104 supporting a previous standard or protocol) and a new / second UE (e.g., UE 104 supporting a new standard or protocol), at least a portion of Table 1 may be modified / configured / updated as shown in Table 2. For example, for UE 104 (e.g., the first UE) utilizing an FD-OCC length of 2 and UE 104 (e.g., the second UE) utilizing an FD-OCC length of 4, the first UE and the second UE may be scheduled on different subsets of DMRS ports within a CDM group (e.g., the same CDM group) (e.g., for UL transmissions).

[0070] For example, if a first UE (e.g., UE 104 supporting a previous / legacy standard or protocol) is indicated (e.g., DL transmission) to have DMRS port 0, then a second UE can be indicated to have DMRS ports 2 and / or 3. In this example, the second UE can be indicated to have DMRS port 1 because the 2-bit OCC length values ​​(e.g., RE-0 and RE-1 as shown in Table 2) are the same between port 0 and port 1. Furthermore, entries or indices for DMRS ports with OCC values ​​can be used to indicate DMRS ports with OCC lengths of 2 and / or 4. Different entries or indices can indicate the OCC for each DMRS port, and UE 104 utilizing at least a portion of entries with an OCC length of 2 can be co-scheduled with UE 104 utilizing at least a portion of entries with an OCC length of 4. In another example, if the first UE is indicated to have DMRS port 1, then only DMRS port 0 can be indicated to the first UE.

[0071] As shown in Table 2, a first UE using DMRS port 0 and / or port 1 to support older versions of cellular protocols or standards can coexist with a second UE using DMRS port 2 and / or port 3 to support newer or updated standards. In some cases, a first UE using DMRS ports 2 / 3 can coexist with a second UE using DMRS ports 0 / 1. Furthermore, as an example, if all DMRS ports are assigned to a new UE, any DMRS port can be used for those assigned UEs.

[0072]

[0073] Table 2

[0074] In some implementations, a time-domain OCC may also be indicated. For example, if a time-domain OCC is indicated / provided / included, as shown in Table 3.1, a CDM group (e.g., CDM group 0) may be obtained / configured by the RRC or indicated by / via the DCI. In this example, other CDM groups (e.g., CDM groups 1 and 2) may be combined into Table 3.1. For DMRS type-2, an OFDM may contain / include up to 12 DMRS ports (e.g., 4 DMRS ports supported per CDM group). For dual-symbol DMRS (e.g., two symbols), up to 8 DMRS ports may be supported in each CDM group (e.g., up to 24 DMRS ports supported in total for three CDM groups).

[0075] In Table 3.1, for DMRS type-2, a DMRS port with an FD-OCC of length 4 can coexist with a DMRS port with an FD-OCC of length 2. The indexes of the eight DMRS ports can correspond to or include ports #0, #1, #2, #3, #12, #13, #14, and #15 of CDM group #0. In some cases, DMRS ports #0, #1, #12, and #13 configured for a first UE (e.g., UE 104 supporting the older standard) or DMRS ports #2, #3, #14, and #15 configured for a second / new UE can be scheduled simultaneously, and vice versa. In this case, the first UE and the second UE can not be scheduled simultaneously in port groups #0, #1, #12, and #13 or port groups #2, #3, #14, and #15. The first DMRS symbol and the second DMRS symbol can include or correspond to an OFDM symbol with a TD-OCC of length 2 that is mapped to a DMRS in a CDM group.

[0076]

[0077] Table 3.1

[0078] Specifically, as shown in Table 3.1, for DMRS type-1, up to 16 DMRS ports can be supported for dual symbols (e.g., 8 DMRS ports for each of the two symbols). Furthermore, the DMRS ports associated with the OCC in the frequency domain can be provided / shown in Table 3.1. Alternatively, Table 3.2 may include or show the coexistence of DMRS ports with an FD-OCC of length 4 and DMRS ports with an FD-OCC of length 2 for DMRS type-1. As shown in the table, the DMRS port indices for DMRS type-1 can be different from those for DMRS type-2. In this example, DMRS type-1 may include DMRS ports #0, #1, #2, #3, #8, #9, #10, and #11.

[0079]

[0080]

[0081] Table 3.2

[0082] III. Implementation Method 3

[0083] In some implementations, the two sets of DMRS ports can be modulated (e.g., encoded or decoded) using a two-step OCC. The two-step OCC can be enabled / indicated by at least one of RRC, MAC CE, and / or DCI, and other indications to UE 104. The two-step OCC can refer to applying / taking / performing / executing OCC in multiple iterations or steps. For example, in the first step, an OCC (e.g., an OCC of length 2) can be applied or used to modulate the DMRS ports of the first UE (e.g., UE 104 supporting an older version of the cellular protocol or standard). For DMRS type-1, DMRS port indices can be indicated / provided from #0 to #7 (e.g., 8 DMRS ports), and for DMRS type-2, DMRS port indices can be indicated / provided from #0 to #11 (e.g., 12 DMRS ports).

[0084] Furthermore, in the second step, another OCC of length 2 can be applied / used / enabled to modulate the result of the first step (e.g., modulation of the DMRS port of the first UE) to obtain a second result. If the total number of DMRS ports is greater than 8 for DMRS type -1 and greater than 12 for DMRS type -2, as shown in Tables 4.1 and 4.2 respectively, the second step can be enabled, and the second step of the OCC can be used to modulate the first step of the OCC (e.g., the result of the first step), and both OCCs can be used to modulate the DMRS port. For example, the index 11 of the second OCC step (e.g., [1,1]) can be converted to [1,1,1,1], where each "1" in [1,1] in the second step of the OCC can represent the actual OCC of the first step of the OCC. For example, if the first step of the OCC is indicated as [1,1], then each value "1" in the second step of the OCC can represent [1,1], and each value -1 in the second step of the OCC represents [-1,-1]. For example, Table 4.1 may include or show parameters for Physical Downlink Shared Channel (PDSCH) DMRS configuration type 1, and Table 4.2 may include parameters for PDSCH DMRS configuration type 2.

[0085]

[0086] Table 4.1

[0087]

[0088]

[0089] Table 4.2

[0090] IV. Implementation Method 4

[0091] In some implementations, a specific OCC length may be used for modulation (e.g., by BS102 and / or UE 104). The OCC length may be indicated by at least one of configuration (e.g., RRC signaling), reserved bits within the DCI field of the MAC CE, etc. For example, a DMRS port with an OCC length of 4 can be enabled via RRC configuration. RRC signaling can configure an OCC length of 4, which can be enabled when the number of DMRS ports is greater than 8 for DMRS type-1 or greater than 12 for DMRS type-2.

[0092] refer to Figure 11 This illustrates an example of a TCI state in a MAC CE. Each “Oct” can represent an octet, and 8 bits can be used within each octet. In another example, reserved bits in the MAC CE can indicate the enablement of a DMRS port with an OCC of length 4 (e.g., other lengths). A TCI state activated for CSI-RS can include / have at least one reserved bit for each TCI state identifier (ID). In this example, for UL transmissions, the DMRS port can be associated with or related to a probe reference signal (SRS) port or resource. The SRS port or resource can obtain / receive / identify QCL information from the TCI state of the DL RS (such as CSI-RS).

[0093] Thus, if a DMRS port for UL transmission is indicated to have one or more TCI states, reserved bits for the TCI states (e.g., reserved bits for each TCI state such that the OCC length indication is specific to each TCI state) can be used / applied to indicate whether the DMRS port is modulated using an OCC of length 2 or length 4. For example, a bit in the DCI field can be used to enable an OCC of length 4, for instance, to indicate whether the DMRS port for UL or DL ​​transmission is modulated using an OCC of length 2 or length 4. In some cases, reserved bit 1 can indicate an OCC of length 4, while reserved bit 0 can indicate an OCC of length 2, and vice versa.

[0094] V. Implementation Method 5

[0095] In some implementations, entries / indicators for the antenna port field in the DCI (e.g., which may resemble the DMRS port field) can be used to indicate whether an OCC of length 2 or length 4 is used for the DMRS port. For example, DMRS ports with OCC lengths of 4 and / or 2 can be indicated, respectively. In this example, if an OCC of length 4 is enabled, Table 5.1 can be used to indicate the DMRS port in the DCI. Otherwise, tables from certain systems or standards can be used to indicate DMRS ports with an OCC length of 2. As shown in Table 5.1, entries for the antenna ports (e.g., #0 to #19) can be shown. In this table, the transform precoder can be disabled so that data mapping on OFDM symbols (e.g., cyclic prefix OFDM transmission) does not require a Digital Fourier Transform (DFT). Furthermore, the DMRS type can be set to 2, the maximum length of the OCC length can be set to bit 1 (e.g., indicating OCC length 4 in this case), and rank 1 can be configured. Other tables discussed herein may include one or more similar or different pieces of information or configuration. The rank can represent the number of layers in an antenna element.

[0096] Each table in the DCI (e.g., Tables 5.1-5.9) can be indicated, where each value or entry can represent / indicate a corresponding or different DMRS port. One or more DMRS ports with an OCC length of 4 or an OCC length of 2 can be indicated by the DMRS port indication in the DCI. Different entries can indicate the same DMRS port with different OCC lengths. For example, as shown in Table 5.2, entries from values ​​#0 to #11 (e.g., antenna ports) can be used to indicate DMRS ports with an OCC length of 2, such as two DMRS ports in each CDM group on an OFDM symbol in the time domain. Table 5.2 (e.g., the entire table) can be used to indicate DMRS ports with an OCC length of 4. For example, Table 5.2 can be used for DMRS ports numbered in CDM groups with OCCs of length 2 and 4, and entries #0 to #11 can be used to indicate DMRS ports for the first UE (e.g., a UE utilizing an OCC of length 2, where there are at most 2 DMRS ports in a CDM group on an OFDM symbol). Tables 5.1 and 5.2 can be used for at least the first UE (e.g., UE 104 utilizing an older version of the protocol) and the second UE (e.g., UE 104 utilizing a newer or updated protocol). As shown in the tables (such as Tables 5.1-5.9), in some cases, bold values ​​can represent or indicate one or more new / additional DMRS ports.

[0097]

[0098] Table 5.1

[0099] (One or more) antenna ports, precoder transformation disabled, DMRS type = 2, maximum length = 1, rank = 1.

[0100] OCC=4

[0101]

[0102] Table 5.2

[0103] (One or more) antenna ports, precoder transformation disabled, DMRS type = 2, maximum length = 1, rank = 1.

[0104] OCC=2 or OCC=4

[0105] In some implementations, if two DMRS ports are indicated, Table 5.3 can be used to indicate one or more DMRS ports with an OCC length of 4. This indication can be associated with an SRS Resource Indicator (SRI) or Transport Precoding Matrix Index (TPMI) field. In some cases, this indication can be enabled if the associated rank is at least one of rank 2, rank 3, or rank 4. In cases where up to four DMRS ports are indicated for at least one UE 104, at least one of Tables 5.4 and / or 5.5 can be used to indicate one or more DMRS ports for rank 3 and / or rank 4. Furthermore, for rank 2 to rank 4, Tables 5.3 to 5.5 can be modified in at least similar ways to Table 5.2. For example, previous / older entries (e.g., #0 to #11) (e.g., up to two DMRS in a CDM group on an OFDM symbol) can be used for the first UE, and the entire table can be used to indicate DMRS ports with an OCC length of 4.

[0106]

[0107]

[0108] Table 5.3: (One or more) antenna ports, transformation precoder disabled, DMRS type = 2, maximum length = 1, rank = 2

[0109] value Number of DMRS CDM groups with no data (one or more) (one or more) DMRS ports 0 2 0-2 1 3 0-2 2 3 3-5 3 1 0、1、6 Reserved Reserved Reserved

[0110] Table 5.4: (One or more) antenna ports, transformation precoder disabled, DMRS type = 2, maximum length = 1, rank = 3

[0111]

[0112] Table 5.5:

[0113] (One or more) antenna ports, transformation precoder disabled, DMRS type = 2, maximum length = 1, rank = 4

[0114] In some implementations, for DMRS type-1, a CDM group may include or be mapped to four DMRS ports on an OFDM symbol (e.g., up to four DMRS ports), and up to two CDM groups may be supported on each PRB of an OFDM symbol, for example, up to eight DMRS ports may be supported. In this example, two CDM groups may support up to eight DMRS ports. Therefore, DMRS ports may be indicated / provided / configured in the DCI based on or according to the rank level (such as in at least one of Tables 5.6 to 5.9).

[0115]

[0116]

[0117] Table 5.6: (One or more) antenna ports, transformation precoder disabled, DMRS type = 1, maximum length = 1, rank = 1

[0118]

[0119] Table 5.7: (One or more) antenna ports, transformation precoder disabled, DMRS type = 1, maximum length = 1, rank = 2

[0120]

[0121] Table 5.8: (One or more) antenna ports, transformation precoder disabled, DMRS type = 1, maximum length = 1, rank = 3

[0122]

[0123] Table 5.9:

[0124] (One or more) antenna ports, transformation precoder disabled, DMRS type = 1, maximum length = 1, rank = 4

[0125] In some cases, the number of supported DMRS ports can be doubled for dual-symbol DMRS (e.g., from 12 to 24 DMRS ports, or from 8 to 16 DMRS ports, etc.). Furthermore, a single TD-OCC can be supported for dual-symbol DMRS. In this case, up to 8 DMRS ports can be supported in each CDM group. For example, four REs can be in the corresponding frequency domain in each time slot, and two symbols can be used in the time domain to map the DMRS ports in the CDM group, for example, two symbols with a length of 4 for FD-OCC and a length of 2 for TD-OCC.

[0126] Therefore, for dual symbols of DMRS type-1 and / or DMRS type-2, the indication in the DCI field can be similar to that indicated in one or more of Tables 5.1 to 5.9. For DMRS type-1, up to 16 DMRS ports can be supported, and DMRS ports #8 to #15 can be indicated; for DMRS type-2, up to 24 DMRS ports can be supported, and DMRS ports #12 to #23 can be indicated.

[0127] VI. Implementation Method 6

[0128] In some implementations, one or more reserved bits in the DMRS port field can all be used to indicate the DMRS port for a specific UE (e.g., a first UE supporting an older version of a standard or protocol) or a new UE (e.g., supporting a newer version of a standard). For example, a first UE may support up to two DMRS ports in a CDM group on an OFDM symbol, and / or up to four DMRS ports in a CDM group with dual-symbol DMRS ports. A new UE may support up to four DMRS ports in a CDM group on an OFDM symbol, and / or up to eight DMRS ports in a CDM group with dual-symbol DMRS ports.

[0129] In this example, reserved bits can be used for at least one of rank 2, rank 3, or rank 4. Based on at least one of Tables 5.1 to 5.9, five bits can be used to indicate a DMRS port for rank 1 (e.g., DMRS port indication), four bits can be used to indicate a DMRS port for rank 2, and fewer than three bits can be used to indicate a DMRS port for rank 3 and / or rank 4. Therefore, if up to five bits are used in the DMRS port indication field in the DCI, one or more reserved bits can be used for indication of the first UE and / or the new / second UE.

[0130] In some cases, for a specific rank, UE 104 can use an OCC of length 4 [1,1,1,1] or an OCC of length 2 [1,1] to modulate (e.g., decode) the DMRS port. In this example, for demodulation of the DMRS port, the modulation of (one or more) DMRS ports may not have a significant impact because no other DMRS ports introduce interference to that particular DMRS port(s). However, for more than one DMRS port, DMRS ports with different OCCs may affect the demodulation result. Thus, for ranks 2 to 4, reserved bits can be used to indicate the OCC length used for the DMRS (e.g., length 2 or length 4).

[0131] refer to Figure 12 This illustrates an example of an indication for a DMRS port with an OCC length of 4 or 2. In this example, to avoid or minimize / reduce the impact on the demodulation results, the last bit in the DMRS indication field can be used as a reserved bit. For example... Figure 12 As shown, if the last bit in the DMRS port indication field (e.g., the DMRS port indication) is indicated as 0, the DMRS port can be configured to modulate using an OCC of length 2. Otherwise, if the last bit in the DMRS port indication field is indicated / provided / configured as 1, the DMRS port can be modulated using an OCC of length 4. Alternatively, in some cases, if the last bit in the DMRS port indication field is indicated as 0, the DMRS port can be modulated using an OCC of length 4, and if the last bit in the DMRS port indication field is indicated as 1, the DMRS port can be modulated using an OCC of length 2.

[0132] VII. Implementation Method 7

[0133] refer to Figure 13 This diagram depicts an example of TD-OCC on non-contiguous OFDM symbols. In some implementations, at least two non-contiguous OFDM symbols can be used to map DMRS ports from at least one CDM group. In this example, TD-OCC can be used to modulate (e.g., decode) the DMRS ports in one / each CDM group of non-contiguous OFDM symbols. Figure 13 As shown, the DMRS port can be mapped onto two non-contiguous OFDM symbols (e.g., symbol #2 and symbol #8, where the first symbol is #0). These two OFDM symbols can be included in or as part of a CDM group and modulated using an OCC of length 2.

[0134] In some cases, a DMRS port can be associated with a corresponding OCC [1,1] or [1,-1]. If up to 6 DMRS ports are supported on a single OFDM symbol, then for a single-symbol DMRS with a TD-OCC of length 2, a TD-OCC on two non-contiguous OFDM symbols can support up to 12 DMRS ports. In the case of a dual-symbol DMRS, a TD-OCC of length 4 can be used to support up to 24 DMRS ports for DMRS type-2, and / or up to 16 DMRS ports for DMRS type-1, as combined... Figure 9 As shown (e.g., a DMRS port with a TD-OCC of length 4). In this example, an OCC of length 4 can include or correspond to at least one of the following: [1,1,1,1], [1,1,-1,-1], [1,-1,1,-1], and / or [1,-1,-1,1]. Therefore, if an FD-OCC of length 2 is used / utilized / selected, each CDM group can support up to 8 DMRS ports.

[0135] In some implementations, the RRC can be configured to indicate whether DMRS in each CDM group of at least two non-contiguous OFDM symbols is supported. At least one field in the RRC used for DL ​​or UL transmissions can be used to configure or indicate whether TD-OCC is supported on non-contiguous OFDM symbols. In some cases, at least one field in the RRC can indicate whether a scheme / operation of certain protocols requiring / needing more than 12 DMRS ports is configured.

[0136] In some cases, DCI signaling can be used (e.g., by BS102) to indicate TD-OCC on non-contiguous OFDM symbols. In this case, one bit in the DCI field used to activate the TCI state and / or a reserved bit in the MAC CE field can be used / configured. In some cases, the number of DMRS ports can be used to indicate whether TD-OCC on non-contiguous OFDM symbols is applied. For example, if a DMRS port maps 2 or 4 OFDM symbols in a specific time slot, TD-OCC on non-contiguous OFDM symbols can be used. In another example, if a DMRS port maps 1 or 3 OFDM symbols in a time slot, TD-OCC on non-contiguous OFDM symbols may not be used.

[0137] In some implementations, TD-OCC can also be used for non-contiguous OFDM symbols if a DMRS port in a CDM group is configured / indicated / provided / established on a non-contiguous OFDM symbol, and one or three OFDM symbols in a time slot are used to map the DMRS. (See reference) Figure 14This diagram illustrates an example of a single-symbol DMRS with TD-OCC in consecutive time slots. In this example, if only one OFDM symbol is used for DMRS mapping, the DMRS in consecutive time slots can be used as a CDM group with an OCC length of 2 for a single-symbol DMRS and / or an OCC length of 4 for a dual-symbol DMRS. In some cases, if one or more DMRS ports are mapped onto three OFDM symbols (e.g., other numbers of OFDM symbols), two of the three OFDM symbols can be used with a TD-OCC of length 2. The two OFDM symbols among the three OFDM symbols can default to the first two symbols (e.g., can be configured to any other combination of two symbols, such as the first and last symbols, or the last two symbols).

[0138] VIII. Implementation Method 8

[0139] In some implementations, FD-OCC or Frequency Division Multiplexing (FDM) and TD-OCC can be indicated by RRC signaling and / or in the DCI field. FD-OCC and / or FDM can be used if RRC is configured to apply or enable FD-OCC or FDM. In some cases, TD-OCC can be used if RRC is configured to apply TD-OCC. In certain aspects, FD-OCC and / or FDM can be used when the number of DMRS symbols is configured or indicated as 1 or 3, and TD-OCC can be used when the number of DMRS ports is configured or indicated as 2 or 4.

[0140] In some implementations, the number of scheduled RBs indicated in the frequency domain resource assignment (FDRA) field can be used to indicate whether the DMRS is mapped to an FDM / FD-OCC mode / method / modality or a TD-OCC mode. For example, FDM / FD-OCC can be used when the number of scheduled RBs(one or more) is even, and TD-OCC can be used when the number of scheduled RBs(one or more) is odd.

[0141] In some implementations, the DMRS port may be associated with a TCI field. QCL parameters (e.g., spatial relationships) may be indicated in the TCI field. Delay-related parameters may be used to indicate whether FD-OCC is utilized / implemented or not. Delay-related parameters (e.g., at least one of average delay or delay spread) may have / influence the demodulation results in the frequency domain. For example, when the delay or delay spread is large (e.g., the delay spread may be greater than 300 or 500 nanoseconds (ns)), FDM or FD-OCC may not operate at optimal capacity or performance for estimating the channel (e.g., a communication channel) (such as channel quality). In this example, TD-OCC may be used instead of or replace FDM or FD-OCC due to the degraded performance of FDM or FD-OCC.

[0142] In some respects, Doppler correlation parameters (e.g., at least one of Doppler shift or Doppler spread) can be used to indicate the Doppler correlation parameters of the DMRS. Doppler correlation parameters can be used to reflect / indicate / obtain / identify / determine the velocity of UE 104 (e.g., the positional displacement, movement, etc. of UE 104). For example, if the Doppler correlation parameters indicate a very high velocity (e.g., greater than 60 or 120 km / h), the demodulation results of different OFDM symbols may differ or be inaccurate, and common demodulation of the DMRS on discontinuous symbols may include / introduce / initiate errors (e.g., additional errors). In this example, TD-OCC may not be used when UE 104 moves at a velocity that easily introduces errors. Alternatively, FDM or FD-OCC can be used in this example.

[0143] In some cases, a single bit in the DCI field can be used to indicate whether the DMRS port is used with FD-OCC / FDM or TD-OCC. In some cases, a reserved bit in the MAC CE of the TCI status activation field can be used to indicate whether DMRS is to be modulated using FDM / FD-OCC or TD-OCC.

[0144] Figure 15 A flowchart of method 1500 for DMRS port configuration and indication is shown. Method 1500 can be used in conjunction with this document. Figures 1 to 14 This can be implemented using any of the components and devices described in the detailed description. In general, method 1500 may include: determining an instruction (1502). Method 1500 may include: sending a message (1504). Method 1500 may include: receiving a message (1506).

[0145] Referring now to operation (1502), a wireless communication node (e.g., gNB / BS) can determine / obtain an indication (e.g., DMRS port indication) that identifies at least one or more DMRS ports associated with an OCC in a CDM group mapped on various non-contiguous resources. In operation (1504), in response to determining the DMRS port indication, the wireless communication node can transmit / send / provide / signal a message including the indication to a wireless communication device (e.g., UE).

[0146] In operation (1506), the wireless communication device may receive / obtain / acquire a message including the indication from the wireless communication node. The indication may be used to indicate / configure one or more DMRS ports associated with at least one OCC in one or more CDM groups mapped on various discontinuous (e.g., non-contiguous) resources or resource elements (REs). Discontinuous resources may include or refer to resources within a specific CDM group mapped to ports that are not adjacent or immediately adjacent to each other.

[0147] In some implementations, the wireless communication device can receive (e.g., via DL DMRS) a length-modulated (e.g., decoded) DMRS from a wireless communication node according to an OCC (e.g., an OCC of length 2 or an OCC of length 4, etc.). In some cases, the wireless communication device can send / provide / transmit length-modulated (e.g., encoded) DMRS according to an OCC to the wireless communication node.

[0148] In some respects, OCC can be applied to at least one of various groups. For example, OCC can be applied to at least two groups of REs included / included / established in various discontinuous resources (e.g., the first RE group could be #1 and #2, and the second RE group could be #6 and #7). In this example, the two groups of REs can be discontinuous relative to each other (e.g., in at least one of the frequency or time domains). In another example, OCC can be applied to at least two groups of OFDM symbols in the time domain included in discontinuous resources. These two groups of OFDM symbols can be discontinuous relative to each other (e.g., in at least one of the frequency or time domains). In yet another example, OCC can be applied to at least two REs included in discontinuous resources. These two REs can be discontinuous relative to each other. In one example, OCC can be applied to at least two OFDM symbols included in discontinuous resources (e.g., OFDM symbols #2 and #9). In this example, these two OFDM symbols can be discontinuous relative to each other.

[0149] In some cases, resources in each of the at least two groups may be contiguous relative to each other. For example, the first group may include a first contiguous resource, while the second group may include a second contiguous resource. Resources between the first and second groups may be discontinuous or non-contiguous. Resources may include at least one of RE or OFDM symbols. In some implementations, the OCC, when having a length of 4, may include / comprise at least one of the following: [1,1,1,1], [1,1,-1,-1], [1,-1,1,-1], or [1,-1,-1,1].

[0150] In some implementations, the DMRS port associated with an OCC of length 4 can be co-scheduled (e.g., coexisting) with a DMRS port associated with an OCC of length 2 via at least one of the following: the OCC of length 2 can be [1,1] or corresponds to [1,1], and the OCC of length 4 can be [1,-1,1,-1] or [1,-1,-1,1]; or the OCC of length 2 can be [1,-1], and the OCC of length 4 can be [1,1,1,1] or [1,1,-1,-1]. For example, the length of the OCC can be indicated based on bit values ​​or according to signals.

[0151] In some cases, when the DMRS is on a single OFDM symbol (e.g., two or more symbols), the DMRS ports in a CDM group can include up to four DMRS ports on four REs. Resources can be contiguous or non-contiguous. In other cases, when the DMRS is on two consecutive OFDM symbols, the DMRS ports in a CDM group can include / have up to eight DMRS ports on eight REs (e.g., they may or may not be consecutive REs). In some implementations, for DMRS type-1 on one OFDM symbol, the CDM group can be mapped across at least two RBs. For example, the at least two RBs can include at least one of the following: at least two consecutive physical RBs, at least two consecutive virtual RBs, or at least two RBs, each of which comes from a contiguously scheduled physical RB.

[0152] In some implementations, for DMRS type-1 on an OFDM symbol of DMRS, the number of RBs used for scheduling a consecutive schedule in the frequency domain (e.g., forming an RB group) can be even. In some aspects, a first wireless communication device supporting an OCC of length 2 (e.g., a first UE supporting an older version of a cellular protocol or standard) and a second wireless communication device supporting an OCC of length 4 (e.g., a new / second UE supporting a newer or updated protocol or standard) can be scheduled on different subsets of DMRS ports within a CDM group. In some cases, a first wireless communication device supporting an OCC of length 2 and / or a second wireless communication device supporting an OCC of length 4 can be scheduled using at least one different OCC value on the first two RE ports within a CDM group.

[0153] In some implementations, the OCC may include a length of 2 and be used to modulate the DMRS in the first step (e.g., in a two-step OCC), and the OCC in the second step may be enabled to modulate the result of the first step. In this case, the OCC in the second step may be enabled by at least one of the following: the total number of DMRS ports is greater than 8 for DMRS type-1 or greater than 12 for DMRS type-2. In some cases, the indication may be communicated / indicated / provided to the wireless communication device by at least one of RRC signaling, MAC CE signaling, or DCI signaling from the wireless communication node.

[0154] In some implementations, the indication of a DMRS port (e.g., a DMRS port indication) can be conveyed by DCI signaling through at least one of the following: an entry in the DMRS port field, a bit in the field, a reserved bit in the DMRS port field, the number of DMRS symbols indicated in the time-domain resource allocation field, the number of PRBs indicated in the frequency-domain resource allocation field, one or more TCI states in the TCI field, one or more quasi-public address (QCL) related parameters or spatial relationships. In some cases, RRC signaling can configure or indicate at least one of the following: enabling the DMRS port for applying the OCC within the CDM group mapped on the plurality of non-contiguous resources (e.g., configured in a field of the RRC signaling) (e.g., field value), a scheme for downlink transmission using the DMRS port to apply the OCC in the CDM group mapped on the plurality of non-contiguous resources, and / or a scheme for uplink transmission using the DMRS port to apply the OCC in the CDM group mapped on the plurality of non-contiguous resources. A scheme can refer to a scenario where up to 24 DMRS ports and / or OCCs of length 4 are to be configured or indicated. For example, if a subframe number (SFN) is configured, specific TCI state information can be restricted / constrained.

[0155] In some implementations, MAC CE signaling can activate / enable at least one of the following: enabling a DMRS port that applies the OCC within the CDM group mapped on the plurality of non-contiguous resources; a scheme / scenario utilizing the DMRS port for downlink transmission to apply the OCC in the CDM group mapped on the non-contiguous resources; and / or a scheme utilizing the DMRS port for uplink transmission to apply the OCC in the CDM group mapped on the non-contiguous resources. In some cases, the indication of the DMRS port can be associated with the Probe Reference Signal (SRS) Resource Indicator (SRI) field and / or the Transport Precoding Matrix Index (TPMI) field. In some cases, the indication can be enabled if the associated rank is at least 2, 3, or 4 (e.g., rank 2 to rank 4). In some implementations, the reserved bits in the MAC CE signaling for activating the TCI state can be configured to indicate at least one DMRS port to apply the OCC in the CDM group mapped on the non-contiguous resources.

[0156] In some implementations, whether a non-contiguous resource is in the frequency domain and / or time domain can be indicated by at least one of the following: an entry in the DMRS port field, a bit in the field, a reserved bit in the DMRS port field, the number of DMRS symbols indicated in the time domain resource allocation field, the number of physical resource blocks indicated in the frequency domain resource allocation field, one or more TCI states in the TCI field, one or more QCL-related parameters, spatial relationships, reserved bits in the fields of RRC configuration and / or MAC CE signaling for activating one or more TCI states. For example, OCC can be used as FD-OCC (e.g., in the frequency domain) and / or TD-OCC (e.g., in the time domain), which is indicated by RRC, MAC CE configuration, or DCI.

[0157] As discussed herein, the definition / term / element / feature / indication / reference of "beam" may include, correspond to, a quasi-co-located (QCL) state, a Transmit Configuration Indicator (TCI) state, a spatial relation state (e.g., sometimes referred to as a spatial relation information state), a reference signal (RS), a spatial filter, and / or precoding, or may be a part thereof. Furthermore, the term "beam state" may be referred to or named "beam". In some cases, the term "Tx beam" may include or correspond to a QCL state, a TCI state, a spatial relation state, a DL / UL reference signal (e.g., a Channel State Information Reference Signal (CSI-RS), a Synchronization Signal Block (SSB) (e.g., sometimes referred to as SS / PBCH), a Demodulation Reference Signal (DMRS), a Probe Reference Signal (SRS), and / or a Physical Random Access Channel (PRACH)), a Tx spatial filter, and / or a Tx precoding.

[0158] In some cases, the term "Rx beam" may include or correspond to QCL state, TCI state, spatial relationship state, spatial filter, Rx spatial filter, and / or Rx precoding. The term "beam ID" may include or correspond to / are equivalent to QCL state index, TCI state index, spatial relationship state index, reference signal index, spatial filter index, and / or precoding index. In some cases, the spatial filter may be a spatial filter on the UE side or BS side (e.g., gNB side). A spatial filter may sometimes be referred to as a spatial domain filter.

[0159] In some implementations, the term "spatial relationship information" may include at least one or more reference RSs. These one or more reference RSs may be used to represent the "spatial relationship" between a target "RS or channel" and one or more reference RSs. In some cases, the term "spatial relationship" may refer to co-located (one or more) beams, co-located (one or more) spatial parameters, and / or co-located (one or more) spatial domain filters. In other cases, the term "spatial relationship" may refer to beams, spatial parameters, and / or spatial domain filters.

[0160] In some cases, the term "QCL state" may include one or more reference RSs and / or corresponding QCL type parameters of one or more reference RSs, or a portion thereof. QCL type parameters may include at least one or a combination of the following: Doppler spread, Doppler frequency shift, delay spread, average delay, average gain, and / or spatial parameters. Spatial parameters may refer to spatial Rx parameters. In some cases, the term "TCI state" may include or correspond to "QCL state".

[0161] QCL types may include at least 'QCL-Type A', 'QCL-Type B', 'QCL-Type C', and / or 'QCL-Type D'. QCL-Type A may include or correspond to Doppler frequency shift, Doppler spread, average delay, and / or delay spread. QCL-Type B may include or correspond to Doppler frequency shift and / or Doppler spread. QCL-Type C may include or correspond to Doppler frequency shift and / or average delay. QCL-Type D may include or correspond to the spatial Rx parameter.

[0162] In some cases, the RS may include at least one of CSI-RS, Synchronization Signal Block (SSB) (e.g., sometimes referred to as SS / PBCH), DMRS, SRS, and / or Physical Random Access Channel (PRACH). Furthermore, the RS may include at least a DL reference signal and / or a UL reference signal. In some embodiments, the DL RS may include at least CSI-RS, SSB, and / or DMRS (e.g., DL DMRS). In some embodiments, the UL RS may include at least SRS, DMRS (e.g., UL DMRS), and / or PRACH.

[0163] In some cases, the term "UL signal" may include, correspond to, or represent PRACH, PUCCH, PUSCH, ULDMRS, or SR. The term "DL" may correspond to PDCCH, PDSCH, SSB, DL DMRS, or CSI-RS.

[0164] While various embodiments of the present solution have been described above, it should be understood that these embodiments are presented by way of example only and not as limitations. Similarly, various diagrams may depict exemplary architectures or configurations provided to enable those skilled in the art to understand exemplary features and functionality of the present solution. However, those skilled in the art will understand that the solution is not limited to the illustrated exemplary architectures or configurations, but can be implemented using various alternative architectures and configurations. Furthermore, as those skilled in the art will understand, one or more features of one embodiment may be combined with one or more features of another embodiment described herein. Therefore, the breadth and scope of this disclosure should not be limited to any of the illustrative embodiments described above.

[0165] It should also be understood that any reference to elements using names such as "first," "second," etc., in this document generally does not restrict the number or order of these elements. Rather, these names may be used herein as a convenient means of distinguishing between two or more elements or instances of elements. Therefore, references to the first and second elements do not imply that only two elements can be used or that the first element must precede the second element in some way.

[0166] Furthermore, those skilled in the art will understand that information and signals can be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, and symbols referenced in the above description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or light particles, or any combination thereof.

[0167] Those skilled in the art will further understand that any of the various illustrative logic blocks, modules, processors, means, circuits, methods, and functions described in connection with the aspects disclosed herein can be implemented by electronic hardware (e.g., digital implementation, analog implementation, or a combination of both), firmware, various forms of program or design code in conjunction with instructions (which may be referred to herein as "software" or "software module"), or any combination of these technologies. To clearly illustrate this interchangeability of hardware, firmware, and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software, or a combination of these technologies, depends on the specific application and the design constraints imposed on the system as a whole. Those skilled in the art can implement the described functionality in various ways for each specific application, but such implementation will not depart from the scope of this disclosure.

[0168] Furthermore, those skilled in the art will understand that the various illustrative logic blocks, modules, devices, components, and circuits described herein can be implemented within or executed by an integrated circuit (IC). An IC can include a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, or any combination thereof. Logic blocks, modules, and circuits may also include antennas and / or transceivers for communicating with various components within a network or device. A general-purpose processor may be a microprocessor, but alternatively, the processor can be any conventional processor, controller, or state machine. The processor can also be implemented as a combination of computing devices, such as a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other suitable configuration that performs the functions described herein.

[0169] If implemented as software, these functionalities can be stored as one or more instructions or code on a computer-readable medium. Therefore, the steps of the methods or algorithms disclosed herein can be implemented as software stored on a computer-readable medium. Computer-readable media include computer storage media and communication media, with communication media including any medium that enables the transfer of computer programs or code from one location to another. Storage media can be any available medium that is accessible to a computer. By way of example and not limitation, such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the required program code in the form of instructions or data structures and that is accessible to a computer.

[0170] In this document, the term "module" as used herein refers to software, firmware, hardware, and any combination of such elements for performing the associated functions described herein. Furthermore, for purposes of discussion, various modules are described as separate modules; however, as will be apparent to those skilled in the art, two or more modules may be combined to form a single module that performs the associated functions according to embodiments of this solution.

[0171] Furthermore, memory or other storage devices and communication components may be used in embodiments of this solution. It should be understood that, for clarity, the above description refers to embodiments of this solution with reference to different functional units and processors. However, it will be apparent that any suitable distribution of functionality among different functional units, processing logic elements, or domains can be used without diminishing the effectiveness of this solution. For example, functions shown to be performed by a separate processing logic element or controller may be performed by the same processing logic element or controller. Therefore, references to specific functional units are merely references to suitable means for providing the described functionality and do not indicate a strict logical or physical structure or organization.

[0172] Various modifications to the embodiments described in this disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the scope of this disclosure. Therefore, this disclosure is not intended to be limited to the embodiments shown herein, but is to be given the broadest scope consistent with the novel features and principles disclosed herein as described in the claims.

Claims

1. A method of wireless communication, comprising: receiving, by a wireless communication device, a message from a wireless communication node including an indication; and wherein the indication indicates a plurality of demodulation reference signal (DMRS) ports associated with an orthogonal cover code (OCC) in one code division multiplexing (CDM) group mapped on a plurality of non-contiguous resources, the OCC having a length of 4, wherein the plurality of non-contiguous resources comprises: two groups of resource elements included in the plurality of non-contiguous resources, wherein the two groups of resource elements are non-contiguous with respect to each other on one orthogonal frequency division multiplexing (OFDM) symbol, each of the two groups of resource elements including two resource elements, or four resource elements included in the plurality of non-contiguous resources, wherein the four resource elements are non-contiguous with respect to each other on one OFDM symbol; and wherein, in a case that DMRS is on a single OFDM symbol, the plurality of DMRS ports in the one CDM group have at most 4 DMRS ports on 4 resource elements (REs); and in a case that DMRS is on two consecutive OFDM symbols, the plurality of DMRS ports in the one CDM group have at most 8 DMRS ports on 8 REs. 2.The method of claim 1, further comprising: receiving, by the wireless communication device, a DMRS modulated according to the length of the OCC from the wireless communication node. 3.The method of claim 1, further comprising: transmitting, by the wireless communication device, a DMRS modulated according to the length of the OCC to the wireless communication node. 4.The method of claim 1, further comprising: modulating, by the wireless communication device, the plurality of DMRS ports according to the OCC having a length of 4 in the one CDM group based on the indication; and mapping, by the wireless communication device, the modulated plurality of DMRS ports associated with the OCC in the one CDM group on the plurality of non-contiguous resources, wherein the plurality of non-contiguous resources comprises the two groups of resource elements that are non-contiguous with respect to each other. resources in each of the two groups of resource elements are contiguous with respect to each other, the resources including the two resource elements.

5. The method of claim 4, wherein, the OOC includes at least one of the following when having a length of 4:

6. The method of claim 1, wherein, [1, -1, 1, -1]; or [1,1,1,1]； [1,1,-1,-1]； for a DMRS type-1 on one orthogonal frequency division multiplexing (OFDM) symbol of DMRS, one CDM group is mapped across at least two resource blocks (RBs). [1,-1,-1,1]。 7. The method of claim 1, wherein, the at least two RBs include at least two contiguous physical RBs.

8. The method of claim 7, wherein, for a DMRS type-1 on one orthogonal frequency division multiplexing (OFDM) symbol of DMRS, a number of resource blocks (RBs) for contiguous scheduling in frequency domain is even.

9. The method of claim 1, wherein, the indication is conveyed to the wireless communication device by at least one of radio resource control (RRC) signaling or downlink control information (DCI) signaling.

10. The method of claim 1, wherein, the indication of the plurality of DMRS ports is conveyed by one bit in one field of the DCI signaling.

11. The method of claim 10, wherein, the RRC signaling configures:

12. The method of claim 10, wherein, ​ enable application of the OCC within the CDM group mapped across the plurality of non-contiguous resources.

13. A method of wireless communication, comprising: determining, by a wireless communication node, an indication of a plurality of demodulation reference signal (DMRS) ports associated with an orthogonal cover code (OCC) in one code division multiplexing (CDM) group mapped across a plurality of non-contiguous resources, the OCC having a length of 4; and transmitting, by the wireless communication node to a wireless communication device, a message including the indication, wherein the plurality of non-contiguous resources comprises: two groups of resource elements included in the plurality of non-contiguous resources, wherein the two groups of resource elements are non-contiguous with respect to each other on one orthogonal frequency division multiplexing (OFDM) symbol, each of the two groups of resource elements including two resource elements, or four resource elements included in the plurality of non-contiguous resources, wherein the four resource elements are non-contiguous with respect to each other on one OFDM symbol; and wherein, in a case that DMRS is on a single OFDM symbol, the plurality of DMRS ports in the one CDM group have at most 4 DMRS ports on 4 resource elements (REs); and in a case that DMRS is on two consecutive OFDM symbols, the plurality of DMRS ports in the one CDM group have at most 8 DMRS ports on 8 REs.

14. A wireless communication device, comprising: at least one processor configured to: receive, via a receiver, a message from a wireless communication node including an indication; wherein the indication indicates a plurality of demodulation reference signal (DMRS) ports associated with an orthogonal cover code (OCC) in one code division multiplexing (CDM) group mapped across a plurality of non-contiguous resources, the OCC having a length of 4, wherein the plurality of non-contiguous resources comprises: two groups of resource elements included in the plurality of non-contiguous resources, wherein the two groups of resource elements are non-contiguous with respect to each other on one orthogonal frequency division multiplexing (OFDM) symbol, each of the two groups of resource elements including two resource elements, or four resource elements included in the plurality of non-contiguous resources, wherein the four resource elements are non-contiguous with respect to each other on one OFDM symbol; and wherein, in a case that DMRS is on a single OFDM symbol, the plurality of DMRS ports in the one CDM group have at most 4 DMRS ports on 4 resource elements (REs); and in a case that DMRS is on two consecutive OFDM symbols, the plurality of DMRS ports in the one CDM group have at most 8 DMRS ports on 8 REs.

15. The wireless communication device of claim 14, wherein, the at least one processor is further configured to: receive, via a receiver, a DMRS modulated according to the length of the OCC from the wireless communication node.

16. The wireless communication device of claim 14, wherein, the at least one processor is further configured to: transmit, via a transmitter to the wireless communication node, a DMRS modulated according to the length of the OCC.

17. The wireless communication device of claim 14, wherein, the at least one processor is further configured to: modulate the plurality of DMRS ports according to the OCC of length 4 in the one CDM group based on the indication; and map the modulated plurality of DMRS ports associated with the OCC in the one CDM group onto the plurality of non-contiguous resources, wherein the plurality of non-contiguous resources comprises the two groups of resource elements that are non-contiguous with respect to each other.

18. The wireless communication device of claim 17, wherein, resources in each of the two groups of resources are contiguous with respect to each other, the resources comprising the two resource elements.

19. A wireless communication node, comprising: at least one processor configured to: determine an indication of a plurality of demodulation reference signal (DMRS) ports associated with an orthogonal cover code (OCC) in one code division multiplexing (CDM) group mapped on a plurality of non-contiguous resources, the OCC having a length of 4; and transmit, via a transmitter, a message including the indication to a wireless communication device, wherein the plurality of non-contiguous resources comprises: two groups of resource elements included in the plurality of non-contiguous resources, wherein the two groups of resource elements are non-contiguous with respect to each other on one orthogonal frequency division multiplexing (OFDM) symbol, each of the two groups of resource elements comprising two resource elements, or four resource elements included in the plurality of non-contiguous resources, wherein the four resource elements are non-contiguous with respect to each other on one OFDM symbol; and wherein, in a case that DMRS is on a single OFDM symbol, the plurality of DMRS ports in the one CDM group have at most 4 DMRS ports on 4 resource elements (REs); and in a case that DMRS is on two contiguous OFDM symbols, the plurality of DMRS ports in the one CDM group have at most 8 DMRS ports on 8 REs.

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