Terminal device, network device and method

Abstract

An exemplary embodiment of the present disclosure relates to an effective mechanism for reference signal (RS) configuration. In this solution, a terminal device determines at least one cyclic shift (CS) for SRS transmission on four antenna ports. The at least one CS includes at least one first CS and at least one second CS, and the at least one second CS is different from the at least one first CS. The terminal device transmits the SRS transmission to a network device on comb structure resources with comb value 8 based on the at least one first CS and the at least one second CS. This improves the performance of peak-to-average power ratio (PAPR).

Description

[Technical field]

[0001] FIELD Exemplary embodiments of the present disclosure relate generally to the field of communications technologies, and more particularly, to a method, apparatus, and medium for reference signal (RS) configuration. [Background technology]

[0002] Wireless communication networks have been widely deployed and can support various kinds of service applications for terminal devices (i.e., user equipment (UE)). Numerous communication methods have been proposed to support the rapidly growing data traffic. For example, to meet the increasing demand for wireless data traffic, multiple methods have been proposed and implemented. Among them, Multiple Input Multiple Output (MIMO) technology is considered as one of the powerful methods to achieve high data throughput in communication systems. MIMO refers to a type of wireless transmission and reception method in which both the transmitter and receiver use multiple antennas.

[0003] Generally, RS transmission is required for wireless communication. Furthermore, an RS used for demodulating data or control signals is called a demodulation (DM) RS, and an RS used for sounding the uplink channel is called a sounding RS (SRS). In Release 17 of the 3rd Generation Partnership Project (3GPP), several enhancements to RS transmission were discussed. The upcoming 3GPP Release 18 is expected to further discuss details and enhancements of RS transmission. Summary of the Invention [Problem to be solved by the invention]

[0004] In general, the exemplary embodiments of the present disclosure provide a solution for RS configuration. If there are any embodiments that do not fall within the scope of the claims, they should be construed as examples useful for understanding various embodiments of the present disclosure. [Means for solving the problem]

[0005] In a first aspect, a communication method is provided. The method includes determining at least one cyclic shift (CS) for SRS transmission on four antenna ports in a terminal device. The at least one CS includes at least one first CS corresponding to a first set of four antenna ports or a first set of REs configured for SRS transmission, and at least one second CS corresponding to a second set of four antenna ports or a second set of REs configured for SRS transmission, the at least one second CS being different from the at least one first CS. The method further includes transmitting an SRS transmission on a comb structure resource of comb value 8 to a network device based on the at least one first CS and the at least one second CS.

[0006] In a second aspect, a communication method is provided. The method includes, in a terminal device, mapping eight antenna ports to comb structure resources according to comb values ​​of the comb structure resources, such that at least two sets of REs based on at least two comb offset values ​​are associated with different CSs or different CS sets, or at least two portions of the eight antenna ports of the SRS resources are associated with different CSs or different CS sets. The method further includes transmitting an SRS transmission to a network device on the comb structure resources.

[0007] In a third aspect, a communication method is provided. The method includes, in a terminal device, determining at least one sequence of a time domain orthogonal cover code (TD-OCC) for a plurality of symbols. A sequence of SRS antenna ports used within a symbol period corresponding to a number of OFDM symbols equal to a length of the TD-OCC is the same. The method further includes transmitting an SRS transmission on the plurality of symbols based on the determined at least one sequence of OCC.

[0008] In a fourth aspect, a communication method is provided. The method includes, in a terminal device, mapping eight antenna ports of an SRS resource to a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols by using at least one TD-OCC. The method further includes transmitting an SRS transmission in the plurality of OFDM symbols to a network device.

[0009] In a fifth aspect, a communication method is provided. The method includes determining, in a terminal device, at least one CS for DMRS transmission type 1 on more than eight antenna ports. Four CSs of the at least one CS are orthonormal to each other with a minimum orthonormal length of 4 or 6. The method further includes performing DMRS transmission with a network device.

[0010] In a sixth aspect, a communication method is provided. The method includes determining, at a terminal device, at least one Frequency Domain Orthogonal Cover Code (FD-OCC) for DMRS transmission type 2 on more than 12 antenna ports. The at least one FD-OCC has a length of 4. The method further includes performing DMRS transmission with a network device.

[0011] In a seventh aspect, a communication method is provided. The method includes receiving, in a terminal device, a configuration for DMRS transmission from a network device. The configuration indicates at least one of information about a length of FD-OCC corresponding to the at least one antenna port configured for the at least one antenna port, or information about an antenna port group scheduled for DMRS transmission. The method further includes performing DMRS transmission with the network device based on the configuration.

[0012] In an eighth aspect, a communication method is provided. The method includes, in a network device, determining at least one CS for SRS transmission on four antenna ports. The at least one CS includes at least one first CS corresponding to a first set of four antenna ports or a first set of REs configured for SRS transmission, and at least one second CS corresponding to a second set of four antenna ports or a second set of REs configured for SRS transmission, the at least one second CS being different from the at least one first CS. The method further includes receiving an SRS transmission on a comb structure resource with a comb value of 8 from a terminal device based on the at least one first CS and the at least one second CS.

[0013] In a ninth aspect, a communication method is provided. The method includes, in a network device, mapping eight antenna ports to comb structure resources according to comb values ​​of the comb structure resources such that at least two sets of REs based on at least two comb offset values ​​are associated with different CSs or different CS sets, or at least two portions of the eight antenna ports of the SRS resources are associated with different CSs or different CS sets. The method further includes receiving an SRS transmission from a terminal device 120 on the comb structure resources.

[0014] In a tenth aspect, a communication method is provided. The method includes, in a network device, determining at least one sequence of TD-OCC for a plurality of symbols. A sequence of SRS antenna ports used within a symbol period corresponding to a number of OFDM symbols equal to a length of the TD-OCC is the same. The method further includes receiving an SRS transmission over the plurality of symbols based on the determined at least one sequence of OCC.

[0015] In an eleventh aspect, a communication method is provided. The method includes, in a network device, mapping eight antenna ports of an SRS resource to a plurality of OFDM symbols by using at least one TD-OCC. The method further includes receiving an SRS transmission from a terminal device in the plurality of OFDM symbols.

[0016] In a twelfth aspect, a communication method is provided. The method includes, in a network device, determining at least one CS for DMRS transmission type 1 on more than eight antenna ports. Four CSs of the at least one CS are orthonormal to each other with a minimum orthonormal length of 4 or 6. The method further includes performing DMRS transmission with a terminal device.

[0017] In a thirteenth aspect, a communication method is provided. The method includes, in a network device, determining at least one FD-OCC for DMRS transmission type 2 on more than 12 antenna ports. The at least one FD-OCC has a length of 4. The method further includes performing DMRS transmission with a terminal device.

[0018] In a fourteenth aspect, a communication method is provided. The method includes, in a network device, transmitting a configuration for DMRS transmission to a terminal device. The configuration indicates at least one of information on a length of FD-OCC corresponding to the at least one antenna port configured for the at least one antenna port, or information on an antenna port group scheduled for DMRS transmission. The method further includes performing DMRS transmission with the terminal device based on the configuration.

[0019] In a fifteenth aspect there is provided a terminal apparatus comprising a processor unit and a memory coupled to the processor unit and having instructions stored thereon, the instructions, when executed by the processor unit, causing the apparatus to perform a method according to the first aspect.

[0020] In a sixteenth aspect there is provided a terminal apparatus comprising a processor unit and a memory coupled to the processor unit and having instructions stored thereon, the instructions, when executed by the processor unit, cause the apparatus to perform a method according to the second aspect.

[0021] In a seventh aspect there is provided a terminal apparatus comprising a processor unit and a memory coupled to the processor unit and having instructions stored thereon, the instructions, when executed by the processor unit, cause the apparatus to perform a method according to the third aspect.

[0022] In an eighth aspect there is provided a terminal apparatus comprising a processor unit and a memory coupled to the processor unit and having instructions stored thereon, the instructions, when executed by the processor unit, cause the apparatus to perform a method according to the fourth aspect.

[0023] In a nineteenth aspect there is provided a terminal apparatus comprising a processor unit and a memory coupled to the processor unit and having instructions stored thereon, the instructions, when executed by the processor unit, causing the apparatus to perform a method according to the fifth aspect.

[0024] In a twentieth aspect there is provided a terminal apparatus comprising a processor unit and a memory coupled to the processor unit and having instructions stored thereon, the instructions, when executed by the processor unit, causing the apparatus to perform a method according to the sixth aspect.

[0025] In a twenty-first aspect there is provided a terminal apparatus comprising a processor unit and a memory coupled to the processor unit and having instructions stored thereon, the instructions, when executed by the processor unit, causing the apparatus to perform a method according to the seventh aspect.

[0026] In a twenty-second aspect there is provided a network device comprising a processor unit and a memory coupled to the processor unit and having instructions stored thereon, the instructions, when executed by the processor unit, causing the device to perform a method according to the eighth aspect.

[0027] In a twenty-third aspect there is provided a network device comprising: a processor unit; and a memory coupled to the processor unit and having instructions stored thereon, the instructions, when executed by the processor unit, causing the device to perform a method according to the ninth aspect.

[0028] In a twenty-fourth aspect there is provided a network device comprising a processor unit and a memory coupled to the processor unit and having instructions stored thereon which, when executed by the processor unit, cause the device to perform a method according to the tenth aspect.

[0029] In a twenty-fifth aspect there is provided a network device comprising a processor unit and a memory coupled to the processor unit and having instructions stored thereon which, when executed by the processor unit, cause the device to perform a method according to the eleventh aspect.

[0030] In a twenty-sixth aspect there is provided a network device comprising a processor unit and a memory coupled to the processor unit and having instructions stored thereon which, when executed by the processor unit, cause the device to perform a method according to the twelfth aspect.

[0031] In a twenty-seventh aspect there is provided a network device comprising a processor unit and a memory coupled to the processor unit and having instructions stored thereon which, when executed by the processor unit, cause the device to perform a method according to the thirteenth aspect.

[0032] In a twenty-eighth aspect there is provided a network device comprising a processor unit and a memory coupled to the processor unit and having instructions stored thereon which, when executed by the processor unit, cause the device to perform a method according to the fourteenth aspect.

[0033] In a twenty-ninth aspect, there is provided a computer readable medium having stored thereon instructions which, when executed on at least one processor, cause the at least one processor to perform a method according to any of the first to fourteenth aspects above.

[0034] It should be understood that this Summary of the Invention is not intended to identify key features or essential features of the embodiments of the present disclosure, nor is it intended to be used to limit the scope of the present disclosure. Other features of the present disclosure will be readily apparent through the following description. [Brief description of the drawings]

[0035] The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description of some exemplary embodiments of the present disclosure in the accompanying drawings.

[0036] [Figure 1] 1 illustrates an exemplary communication environment in which exemplary embodiments of the present disclosure may be practiced.

[0037] [Figure 2A] 1 shows a signaling chart illustrating a communication process according to some embodiments of the present disclosure.

[0038] [Figure 2B] 1 illustrates an example of antenna port mapping in accordance with some embodiments of the present disclosure.

[0039] [Figure 2C] The complementary cumulative distribution function (CCDF) of the PAPR of the four-port SRS transmission is shown.

[0040] [Figure 3A] 1 illustrates an example of antenna port mapping for comb value 2 in accordance with some embodiments of the present disclosure.

[0041] [Figure 3B] 13 illustrates another example of antenna port mapping for comb value 2 in accordance with some embodiments of the present disclosure.

[0042] [Figure 3C] 1 illustrates an example of antenna port mapping for a comb value of 4, in accordance with some embodiments of the present disclosure.

[0043] [Figure 3D] 1 illustrates an example of antenna port mapping for a comb value of 8, in accordance with some embodiments of the present disclosure.

[0044] [Figure 4A] 1 illustrates an example of antenna port mapping when TD-OCC length is 2, in accordance with some embodiments of the present disclosure.

[0045] [Figure 4B] 1 illustrates an example of antenna port mapping when the TD-OCC length is 4, in accordance with some embodiments of the present disclosure.

[0046] [Diagram 5] 1 illustrates an example method performed by a terminal device according to some embodiments of the present disclosure.

[0047] [Figure 6] 1 illustrates an example method performed by a terminal device according to some embodiments of the present disclosure.

[0048] [Figure 7] 1 illustrates an example method performed by a terminal device according to some embodiments of the present disclosure.

[0049] [Figure 8] 1 illustrates an example method performed by a terminal device according to some embodiments of the present disclosure.

[0050] [Figure 9] 1 illustrates an example method performed by a terminal device according to some embodiments of the present disclosure.

[0051] [Figure 10] 1 illustrates an example method performed by a terminal device according to some embodiments of the present disclosure.

[0052] [Figure 11] 1 illustrates an example method performed by a terminal device according to some embodiments of the present disclosure.

[0053] [Figure 12] 1 illustrates an example method performed by a network device according to some embodiments of the present disclosure.

[0054] [Figure 13] 1 illustrates an example method performed by a network device according to some embodiments of the present disclosure.

[0055] [Figure 14] 1 illustrates an example method performed by a network device according to some embodiments of the present disclosure.

[0056] [Figure 15] 1 illustrates an example method performed by a network device according to some embodiments of the present disclosure.

[0057] [Figure 16] 1 illustrates an example method performed by a network device according to some embodiments of the present disclosure.

[0058] [Figure 17]1 illustrates an example method performed by a network device according to some embodiments of the present disclosure.

[0059] [Figure 18] 1 illustrates an example method performed by a network device according to some embodiments of the present disclosure.

[0060] [Figure 19] FIG. 1 shows a schematic block diagram of an apparatus suitable for practicing exemplary embodiments of the present disclosure.

[0061] Throughout the drawings, the same or similar reference numbers represent the same or similar elements. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0062] The principles of the present disclosure will be described with reference to some exemplary embodiments. It should be understood that these embodiments are described for illustrative purposes only to aid those skilled in the art in understanding and implementing the present disclosure, and do not imply any limitations on the scope of the present disclosure. The embodiments described herein can be implemented in a variety of ways other than those described below.

[0063] In the following description and claims, unless defined otherwise, all technical and scientific terms used have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0064] References in this disclosure to "one embodiment," "an embodiment," "an exemplary embodiment," and the like indicate that the embodiment being described may include a particular feature, structure, or characteristic, but not all embodiments need to include such a particular feature, structure, or characteristic. Furthermore, these phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is believed to be within the knowledge of one of ordinary skill in the art to affect such feature, structure, or characteristic in connection with other embodiments, whether or not explicitly described.

[0065] In this specification, terms such as "first", "second", etc. may be used to describe various elements, but it should be understood that such elements should not be limited by these terms. These terms are used only to distinguish one element from another element. For example, a first element can be referred to as a second element, and similarly, a second element can be referred to as a first element, without departing from the scope of the exemplary embodiments. As used herein, the term "and / or" includes any and all combinations of one or more of the listed items.

[0066] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the example embodiments. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that the terms "comprise," "includes," "has," "having," "including," and / or "comprising," when used herein, specify the presence of stated features, elements, and / or components, etc., but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0067] In some instances, values, procedures, or devices are referred to as "optimum," "lowest," "highest," "minimum," "maximum," etc. It is understood that such descriptions are intended to indicate choices among multiple functional alternatives that may be used, and that such choices are not necessarily better, smaller, higher, or more preferred than other choices.

[0068] As used herein, the term "communication network" refers to a network conforming to any suitable communication standard, such as New Radio (NR), Long Term Evolution (LTE), LTE-Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA), High-Speed ​​Packet Access (HSPA), Narrow Band Internet of Things (NB-IoT), etc. Furthermore, communication between terminal devices and network devices in the communication network may be performed by any suitable generation of communication protocols, including, but not limited to, first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, fifth generation (5G), 5.5G, 5G-Advanced Network, or sixth generation (6G) communication protocols, and / or other protocols now known or developed in the future. Embodiments of the present disclosure may be applied to various communication systems. Considering the rapid development of communication, there will naturally be future communication technologies and communication systems in which the present disclosure can be embodied, and the scope of the present disclosure should not be deemed to be limited only to the aforementioned systems.

[0069] In this specification, the term "terminal device" refers to any device having wireless or wired communication capabilities. Examples of terminal devices include user equipment (UE), personal computers, desktops, mobile phones, cell phones, smartphones, personal digital assistants (PDAs), portable computers, tablets, wearable devices, Internet of Things (IoT) devices, Ultra-Reliable Low Latency Communication (URLLC) devices, Internet of Everything (IoE) devices, Machine Type Communication (MTC) devices, vehicle-mounted devices for V2X communication (where X means pedestrian, vehicle or infrastructure / network), devices for Integrated Access and Backhaul (IAB), spacecraft or aircraft in Non-Terrestrial Networks (NTN) including High Altitude Platforms (HAP) and satellites, including Unmanned Aerial Systems (UAS), and Extended Reality (XR) including different types of reality such as Augmented Reality (AR), Mixed Reality (MR), and Virtual Reality (VR). Examples of such devices include, but are not limited to, Reality (UE) devices, unmanned aerial vehicles (UAVs) that do not require a human pilot, commonly known as drones, devices on high speed trains (HST), imaging devices such as digital cameras, sensors, gaming devices, music storage and playback devices, or Internet devices that allow wireless or wired Internet access and browsing. A "terminal device" may also have multicast / broadcast capabilities to support public safety and mission critical, V2X applications, transparent IPv4 / IPv6 multicast distribution, IPTV, smart TV, wireless services, wireless software distribution, group communication, and IoT applications. It may also incorporate one or more subscriber identity modules (SIMs), known as multi-SIM. The term "terminal device" may be used interchangeably with UE, mobile station, subscriber equipment, mobile terminal, user terminal, or wireless device.

[0070] As used herein, the term "network device" refers to a device capable of providing or hosting a cell or coverage through which terminal devices can communicate. Examples of network devices include, but are not limited to, satellites, unmanned aerial system (UAS) platforms, Node Bs (NodeBs or NBs), Evolved Node Bs (eNodeBs or eNBs), next generation Node Bs (gNBs), transmit / receive points (TRPs), remote radio units (RRUs), radio heads (RHs), remote radio heads (RRHs), IAB nodes, low power nodes such as femto nodes, pico nodes, reconfigurable intelligent surfaces (RISs), etc.

[0071] A terminal device or a network device may have an artificial intelligence (AI) or machine learning function, which generally includes a model that can be used to learn from a large amount of data collected for a specific function and predict some information.

[0072] The terminal device or network device may function in multiple frequency ranges, e.g., FR1 (410 MHz-7125 MHz), FR2 (24.25 GHz-71 GHz), higher than 100 GHz, Terahertz (THz), etc. Furthermore, it can function in licensed / unlicensed / shared spectrum. The terminal device may have multiple connections with the network device in a multi-radio dual connectivity (MR-DC) application scenario. The terminal device or network device can function in full duplex, flexible duplex, and cross division duplex modes.

[0073] Embodiments of the present disclosure may be implemented in test equipment, such as, for example, a signal generator, a signal analyzer, a spectrum analyzer, a network analyzer, a test terminal equipment, a test network equipment, a channel emulator, and the like.

[0074] Embodiments of the present disclosure may be performed in accordance with any generation of communication protocols now known or developed in the future, including, but not limited to, first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, fifth generation (5G) communication protocols, 5.5G, 5G-Advanced networks, or sixth generation (6G) networks.

[0075] As used herein, the term "circuitry" may refer to hardware circuits and / or combinations of hardware circuits and software. For example, a circuit may be a combination of analog and / or digital hardware circuits and software / firmware. As a further example, a circuit may be any portion of a hardware processor with software, such as a digital signal processor, software, and memory that work together to perform various functions on a device, such as a terminal device or a network device. In yet another example, a circuit may be a hardware circuit and / or processor, such as a microprocessor or a portion of a microprocessor, that requires software / firmware for operation, but the software may not be present when not required for operation. As used herein, the term circuitry also encompasses merely a hardware circuit or processor, or a portion of a hardware circuit or processor, and its (or their) accompanying software and / or firmware implementations.

[0076] TIFF2025506475000002.tif168168

[0077] TIFF2025506475000003.tif24168

[0078] Since the maximum number of CS values ​​for 4-port SRS transmission is 6, the CS values ​​of ports #0 and #2 are the same as the CS values ​​of ports #1 and #3, which leads to the degradation of peak to average power ratio (PAPR) performance. Therefore, it is expected to improve the PAPR performance of 4-port SRS transmission on comb structure resources with comb value 8.

[0079] Additionally, several enhancements regarding SRS and DMRS transmissions were considered in Release 17. For example, several goals were proposed: Enhanced SRS functionality for both frequency range (FR) 1 and FR2 - Demonstrates SRS switching for up to 8 antennas - Evaluate and, if necessary, specify the following mechanisms to extend SRS capability and / or coverage: SRS time bundling, increased SRS repetition, partial sounding across frequencies. Enhanced DMRS functionality for both FR1 and FR2 - Consider a larger number of orthogonal DMRS ports for downlink and uplink MU-MIMO (without increasing DMRS overhead) and specify the number if appropriate. - Up to 24 orthogonal DMRS ports. For each applicable DMRS type, the maximum number of orthogonal ports is doubled for both single-symbol DMRS and double-symbol DMRS.

[0080] In summary, the number of antenna ports for both SRS and DMRS transmissions is increased. In this case, it is desirable to discuss the transmission configuration of SRS and DMRS with the increased number of antenna ports.

[0081] According to some embodiments of the present disclosure, configuration for RS (including SRS and DMRS) is increased, which solves at least some of the above problems.

[0082] It should be understood that the above problems are merely illustrative and do not imply any limitation, and none of the concerns and problems addressed by this disclosure are limited to the problems set forth above.

[0083] TIFF2025506475000004.tif223168

[0084] In this disclosure, some terms may refer to the same or similar physical meaning and may be used interchangeably. Some examples are given below: ● The terms "resource block", "RB", "physical resource block" and "PRB" may be used interchangeably. ● The terms "symbol" and "OFDM symbol" may be used interchangeably.

[0085] Example Environment 1 illustrates an exemplary communication network 100 in which embodiments of the present disclosure may be implemented. Communication network 100 includes network device 110-1 and, optionally, network device 110-2 (collectively or individually referred to as network device 110). Network device 110 may provide services to end device 120. For purposes of discussion, network device 110-1 may be referred to as first network device 110-1 and network device 110-2 may be referred to as second network device 110-2. Furthermore, first network device 101-1 and second network device 110-1 may communicate with each other.

[0086] In the environment 100, a link from a network device 110 (such as the first network device 110-1 or the second network device 110-2) to a terminal device 120 is referred to as a downlink, while a link from the terminal device 120 to a network device 110 (such as the first network device 110-1 or the second network device 110-2) is referred to as an uplink. In a downlink, the first network device 110-1 or the second network device 120-1 is a transmitting (TX) device (or transmitter) and the terminal device 120 is a receiving (RX) device (or receiver). In an uplink, the terminal device 120 is a transmitting (TX) device (or transmitter) and the first network device 110-1 or the second network device 110-2 is a RX device (or receiver).

[0087] In some embodiments, network device 110 and end device 120 may communicate over a direct link / channel.

[0088] Additionally, in the embodiment of Figure 1, multi-TRP transmission is also supported. As shown in Figure 1, the terminal device 120 may communicate with two TRPs, namely TRPs 130-1 and 130-2 (collectively or individually referred to as TRPs 130). For purposes of discussion, TRP 130-1 will be referred to as the first TRP 130-1 and TRP 130-2 will be referred to as the second TRP 130-2.

[0089] Further, to support multiple TRPs and / or multiple panels, the network device 110 may include one or more TRPs. For example, the network device 110 may be coupled with multiple TRPs in different geographic locations to achieve better coverage. In one specific exemplary embodiment, the first network device 110-1 includes a first TRP 130-1 and a second TRP 130-2. Alternatively, in another specific exemplary embodiment, the first network device 110-1 and the second network device 110-2 include a first TRP 130-1 and a second TRP 130-2, respectively.

[0090] Further, in the specific example of Fig. 1, both single TRP mode transmission and multi-TRP transmission are supported. Specifically, in the single TRP mode, the terminal device 120 communicates with the network 100 via the first TRP 130-1 / second TRP 130-2. Alternatively, in the multi-TRP mode, the terminal device 120 communicates with the network 100 via both the first TRP 130-1 and the second TRP 130-2.

[0091] Furthermore, the network device 110 may provide one or more serving cells, and the first TRP 130-1 and the second TRP 130-2 may be included in the same serving cell or in different serving cells. In other words, in the embodiment of FIG. 1, both inter-cell transmission and intra-cell transmission are supported.

[0092] Further, in the specific example of Fig. 1, when the single DCI mode is applied, the terminal device 120 receives a single DCI message (S-DCI) from the first TRP 130-1. It should be understood that the single DCI message can also be received from the second TRP 130-2. Alternatively, when the multi-DCI mode is applied, the terminal device 120 receives two DCI messages (M-DCI) from the first TRP 130-1 and the second TRP 130-2, respectively.

[0093] Communications in the communications environment 100 may conform to any suitable standard, including, but not limited to, Long Term Evolution (LTE), LTE Evolution (LTE-Evolution), LTE-Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (CDMA), and Global System for Mobile Communications (GSM). Furthermore, communications may be performed according to any currently known or future developed generation of communications protocols. Examples of communications protocols include, but are not limited to, first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, fifth generation (5G), 5.5G, 5G-Advanced network, or sixth generation (6G) communications protocols.

[0094] It should be understood that the number, connections, and types of devices (i.e., terminal devices 120, network devices 110, and TRPs 130) shown in Figure 1 are for illustrative purposes only and do not imply any limitations. Communications network 100 may include any suitable number of devices suitable for implementing embodiments of the present disclosure.

[0095] Example Process Although features / operations are discussed individually in specific exemplary embodiments, it should be understood that these features / operations described in different exemplary embodiments can be used in any suitable combination, unless expressly stated to the contrary.

[0096] Further, it should be understood that the operations at the terminal device 120 and the network device 110 should be consistent. In other words, the network device 110 and the terminal device 120 should have a common understanding of settings, parameters, etc. Such a common understanding may be implemented by any suitable interaction between the network device 110 and the terminal device 120, or by both the network device 110 and the terminal device 120 applying the same rules / policies. In the following, some operations are described from the perspective of the terminal device 120, but it should be understood that the corresponding operations should be performed by the network device 110. Similarly, some operations are described from the perspective of the network device 110, but it should be understood that the corresponding operations should be performed by the terminal device 120. For the sake of brevity, some identical or similar content is omitted herein.

[0097] Furthermore, in the following description, several interactions are performed between terminal device 120 and network device 110. It should be understood that the interactions may be performed in either one single signaling / message or multiple signaling / messages, including system information (SI), RRC messages, downlink control information (DCI) messages, uplink control information (UCI) messages, media access control (MAC) control elements (CEs), etc. The present disclosure is not limited in this respect.

[0098] Exemplary processes for different scenarios are discussed below.

[0099] Example process of 4-port SRS transmission As described above, the limitation of the maximum number of CS values ​​leads to degradation of the PAPR performance of the 4-port SRS transmission. According to some example embodiments of the present disclosure, the CS setting of the 4-port SRS transmission is improved, thereby improving the PAPR performance.

[0100] The principles and implementations of the present disclosure are described in detail below with reference to Figures 2A and 2B. Figure 2A illustrates a signaling chart showing a process 200 of communication according to some exemplary embodiments of the present disclosure, while Figure 2B illustrates an example of antenna port mapping 250 according to some embodiments of the present disclosure. For discussion purposes, the process 200 is described with reference to Figure 1. The process 200 may involve a terminal device 120 and a network device 110.

[0101] In the specific example of FIGS. 2A and 2B, SRS transmission by four antenna ports (ports #0 to #3) is set in the comb structure resources with a comb value of 8.

[0102] During operation, the terminal device 120 determines at least one CS for a four-port SRS transmission (220-1), while the network device 110 accordingly determines at least one CS (220-2). Based on the determined at least one CS, the terminal device 120 transmits an SRS transmission to the network device 110 (230).

[0103] In particular, the at least one CS includes at least one first CS and at least one second CS, where the at least one first CS corresponds to a first set of four antenna ports (or at least one first RE configured for SRS transmission), and the at least one second CS corresponds to a second set of four antenna ports (or at least one second RE configured for SRS transmission). According to some example embodiments of the present disclosure, the at least one second CS is different from the at least one first CS.

[0104] TIFF2025506475000005.tif65168

[0105] In this way, the PAPR performance of the 4-port SRS is enhanced. Please refer now to Figure 2C, which shows the CCDF of the PAPR 280 of the 4-port SRS transmission. As shown in Figure 2C, the PAPR performance is enhanced compared to the conventional solution.

[0106] In some embodiments, the terminal device 120 (and the network device 110) determines an offset value for calculating either the at least one first CS or the at least one second CS such that the at least one second CS is different from the at least one first CS.

[0107] In some embodiments, the offset value may be defined as a default value. Specifically, the default value may be defined by a wireless organization (e.g., 3GPP), or a network operator, a service provider, etc. Alternatively, the offset value may be configured by the network device 110. As shown in FIG 2A, the network device 110 transmits 210 a configuration indicating the offset to the terminal device 120, such as via an RRC message, a DCI message, a MAC CE message, or any suitable message.

[0108] TIFF2025506475000006.tif105168

[0109] TIFF2025506475000007.tif67168

[0110] TIFF2025506475000008.tif27168

[0111] It should be appreciated that the specific embodiment described above (in which a parameter offset is introduced) is merely for illustrative purposes and does not imply any limitation. In other exemplary embodiments, any suitable parameter may be introduced. The present disclosure is not limited in this respect.

[0112] Example process of 8-port SRS transmission As mentioned above, in the upcoming 3GPP Release 18, the number of antenna ports for SRS transmission is expected to increase up to 8. According to some example embodiments of the present disclosure, methods for mapping 8 antenna ports according to different comb structures are discussed in detail.

[0113] In some embodiments, terminal device 120 (and network device 110) maps the eight antenna ports of the SRS resources to the comb structure resources according to the comb values ​​of the comb structure resources.

[0114] Generally, if the CS values ​​at each comb offset are different, the PAPR performance is best, and if the CS values ​​at at least two comb offset values ​​are different, the PAPR performance is better than if all CS values ​​at the comb offsets are the same. In this regard, according to some example embodiments of the present disclosure, at least two sets of REs based on at least two comb offset values ​​are associated with different CSs (or different CS sets). In other words, at least two portions of the eight antenna ports are associated with different CSs (or different CS sets). Then, the terminal device 120 transmits SRS transmissions on the comb structure resources. In this way, different REs (i.e., different portions of the eight antenna ports, or different comb offsets) can be associated with different CSs, thereby ensuring the PAPR performance.

[0115] In some embodiments, the at least two REs are the two adjacent / closest REs, in this way PAPR performance can be optimized even when there are not enough CSs to ensure that each RE is associated with a different CS from all other REs.

[0116] In some embodiments, the comb value of the comb structure resource is one of the following {2, 4, 8, 12}. Furthermore, the association between the comb value and the maximum number of CS values ​​is predefined. Specifically, when the comb value of the comb structure resource is 2, the maximum number of CS values ​​is 8, when the comb value of the comb structure resource is 4, the maximum number of CS values ​​is 12, and when the comb value of the comb structure resource is 8, the maximum number of CS values ​​is 6.

[0117] TIFF2025506475000009.tif50168

[0118] Below, we will discuss several specific examples with different comb values ​​one by one.

[0119] If the com value is 2 In some embodiments, the comb value of the comb structure resource is 2 (i.e., K TC =2), the terminal device 120 (and the network device 110) maps a first portion of the eight antenna ports to a first set of REs based on a first comb offset, and the first portion of the eight antenna ports is associated with a first CS set. Further, the terminal device 120 (and the network device 110) maps a second portion of the eight antenna ports to a second set of REs based on a second comb offset, and the second portion of the eight antenna ports is associated with a second CS set. In particular, the second CS set is different from the first CS set.

[0120] In one specific exemplary embodiment, the first CS set may be {n_CS, (n_CS+2) mod 8, (n_CS+4) mod 8, (n_CS+6) mod 8} and the second CS set may be {(n_CS+cs_offset) mod 8, (n_CS+2+cs_offset) mod 8, (n_CS+4+cs_offset) mod 8, (n_CS+6+cs_offset) mod 8}. Furthermore, cs_offset may be 0 or 1. Furthermore, the first comb offset may be different from the second comb offset. In one example, the first comb offset and the second comb offset may be 0 and 1, respectively. In another example, the first comb offset and the second comb offset may be 1 and 0, respectively.

[0121] Please refer now to Figure 3A. Figure 3A illustrates an example of an antenna port mapping 300 for comb value 2, in accordance with some embodiments of the present disclosure.

[0122] TIFF2025506475000010.tif96168

[0123] Alternatively, in some other embodiments, the comb value of the comb structure resource is 2 (i.e., K TC =2), the terminal device 120 (and the network device 110) maps a first portion of the eight antenna ports to a first set of REs based on a first comb offset, and the first portion of the eight antenna ports is associated with a first CS set. Further, the terminal device 120 (and the network device 110) maps a second portion of the eight antenna ports to a second set of REs based on a second comb offset, and the second portion of the eight antenna ports is associated with a second CS set. In particular, the second CS set is the same as the first CS set.

[0124] In one specific exemplary embodiment, the first CS set and the second CS set may be {n_CS, (n_CS+2) mod 8, (n_CS+4) mod 8, (n_CS+6) mod 8}. Furthermore, the first comb offset may be different from the second comb offset. In one example, the first comb offset and the second comb offset may be 0 and 1, respectively. In another example, the first comb offset and the second comb offset may be 1 and 0, respectively.

[0125] TIFF2025506475000011.tif95168

[0126] Alternatively, in some other embodiments, the comb value of the comb structure resource is 2 (i.e., K TC = 2), the terminal device 120 (and the network device 110) maps the eight antenna ports to the same set of REs based on the comb offset. In some other embodiments, the comb offset may be 0 or 1. Furthermore, each antenna port of the eight antenna ports is associated with a respective CS. In one specific exemplary embodiment, the CSs of the eight antenna ports may be n_CS, (n_CS+1) mod 8, (n_CS+2) mod 8, (n_CS+3) mod 8, (n_CS+4) mod 8, (n_CS+5) mod 8, (n_CS+6) mod 8, (n_CS+7) mod 8, respectively.

[0127] TIFF2025506475000012.tif70168

[0128] TIFF2025506475000013.tif26168

[0129] Alternatively, in some embodiments, the eight antenna port mapping may be implemented with two sets of four antenna ports. In other words, the eight port SRS mapping is composed of two four port SRS mappings. In this case, an additional comb offset (which may be "1") and / or an additional CS offset (which may be "1") may be introduced for the second set of four ports of any antenna port.

[0130] TIFF2025506475000014.tif58168

[0131] In the specific exemplary embodiment described above, some rules and parameters are defined or implemented for antenna port mapping. It should be clarified that such rules and parameters may be defined by default. In particular, such rules and parameters may be specified by a wireless organization (e.g., 3GPP), a network operator, a service provider, etc. Alternatively, such rules and parameters may be configured by the network device 110 via an RRC message, a DCI message, a MAC CE message, or any suitable message, etc.

[0132] If the com value is 4 In some embodiments, the comb value of the comb structure resource is 4 (i.e., K TC = 4), the terminal device 120 (and the network device 110) maps the four antenna port sets of the eight antenna ports to four different sets of REs based on the four comb offset values. In particular, each antenna port set of the four antenna port sets includes two antenna ports, and different antenna port sets of the four antenna port sets or different sets of REs may be associated with different CS sets.

[0133] Please refer now to Figure 3C. Figure 3C illustrates an example of antenna port mapping 320 for a comb value of 4, in accordance with some embodiments of the present disclosure.

[0134] TIFF2025506475000015.tif93168

[0135] In some embodiments, the first value of the comb offset, the second value of the comb offset, the third value of the comb offset, and the fourth value of the comb offset may be at least one of {0, 1, 2, 3}. Further, in some embodiments, the first value of the comb offset, the second value of the comb offset, the third value of the comb offset, and the fourth value of the comb offset may be different from each other. In some embodiments, the first value of the comb offset may be represented as k1. For example, k1 may be at least one of {0, 1, 2, 3}. In some embodiments, the second value of the comb offset may be represented as (k1+1) mod K TC Alternatively, in some other embodiments, the second value of the comb offset may be (k1+2) mod K TC In some embodiments, the third value of the comb offset may be (k1+2) mod K TC Alternatively, in some other embodiments, the third value of the comb offset may be (k1+1) mod K TC In some embodiments, the fourth value of the comb offset may be (k1+3) mod K TC may be also possible.

[0136] In some embodiments, the parameter "cs_offset 1 / cs_offset 2 / cs_offset 3" may be one of {0,1,2,3,4,5}. In some embodiments, cs_offset 1, cs_offset 2, and cs_offset 3 may be different from each other. Alternatively, cs_offset 1 may be the same as cs_offset 3, while cs_offset 2 may be 0. For example, cs_offset 1 and / or cs_offset 3 may be 3, and cs_offset 2 may be 0. Furthermore, the values ​​of cs_offset1 and / or cs_offset2 and / or cs_offset3 may be pre-determined or configured via DCI and / or MAC CE and / or RRC.

[0137] Alternatively, in some embodiments, the comb value of the comb structure resource is 4 (i.e., K TC = 4), the terminal device 120 (and the network device 110) maps the two antenna port sets of eight antenna ports to two different sets of REs based on the first and second comb offsets. In particular, each antenna port set of the two antenna port sets includes four antenna ports, and different antenna port sets of the two antenna port sets or different sets of REs may be associated with different CS sets.

[0138] TIFF2025506475000016.tif60168

[0139] In the specific exemplary embodiment described above, several rules and parameters (cs_offset, cs_offset 1, cs_offset 2, cs_offset 3) are defined or introduced for antenna port mapping. It is to be clarified that such rules and parameters may be defined by default. In particular, such rules and parameters may be specified by a wireless organization (e.g., 3GPP), a network operator, a service provider, etc. Alternatively, such rules and parameters may be configured by the network device 110 via an RRC message, a DCI message, a MAC CE message, or any suitable message, etc.

[0140] If the com value is 8 In some embodiments, the comb value of the comb structure resource is 8 (i.e., K TC = 8), then terminal device 120 (and network device 110) may map 8 antenna ports to REs based on the 8 comb offset values. See now FIG. 3D, which illustrates an example of antenna port mapping 340 for comb value 8, in accordance with some embodiments of the present disclosure.

[0141] TIFF2025506475000017.tif39168

[0142] Some other example sets of CS values ​​are given below: > Set# 1: {0,1,0,1,0,1,0,1} > Set # 2: {0, 3, 1, 4, 2, 5, 0, 3} > Set # 3: {0,1,2,3,4,5,0,1} > Set # 4: {0,1,2,3,0,1,2,3} > Set # 5: {0, 3, 1, 4, 2, 5, 1, 4} > Set # 6: {0,1,0,1,2,3,2,3} > Set # 7: {0, 3, 1, 2, 0, 3, 1, 2} > Set # 8: {0,3,0,3,0,3,0,3}

[0143] In some embodiments, a scenario in which the same CS value is associated with all comb offsets (i.e., all antenna ports) should be avoided. It should be understood that the example sets of CS values ​​provided above are for illustrative purposes only and do not imply any limitations. Other example embodiments may define other sets of CS values. The present disclosure is not limited in this respect.

[0144] In some embodiments, the comb value of the comb structure resource is 8 (i.e., K TC = 8), the terminal device 120 (and the network device 110) may map the two antenna port sets of eight antenna ports to two different sets of REs based on the first comb offset and the second comb offset. In particular, each antenna port set of the two antenna port sets includes four antenna ports, and different antenna port sets of the two antenna port sets or different sets of REs may be associated with different CS sets.

[0145] In some embodiments, the first value of the comb offset and the second value of the comb offset may be one of {0, 1, 2, 3, 4, 5, 6, 7}. In some embodiments, the first value of the comb offset may be different from the second value of the comb offset. In one specific exemplary embodiment, the first value of the comb offset may be represented as k1, where k1 may be one of {0, 1, 2, 3, 4, 5, 6, 7}, and the second value of the comb offset may be (k1+4) mod K. TC may be also possible.

[0146] TIFF2025506475000018.tif99168

[0147] In some embodiments, the comb value of the comb structure resource is 8 (i.e., K TC = 8), the terminal device 120 (and the network device 110) maps the four antenna port sets of eight antenna ports to four different sets of REs based on four comb offset values ​​(e.g., a first comb offset value, a second comb offset value, a third comb offset value, and a fourth comb offset value). In particular, each antenna port set of the four antenna port sets includes two antenna ports, and different antenna port sets of the four antenna port sets or different sets of REs may be associated with different CS sets.

[0148] In some embodiments, any of the first comb offset value, the second comb offset value, the third comb offset value, and the fourth comb offset value may be one of {0, 1, 2, 3, 4, 5, 6, 7}. In one specific exemplary embodiment, the first comb offset value, the second comb offset value, the third comb offset value, and the fourth comb offset value may be different from each other. In another specific exemplary embodiment, the first comb offset value may be represented as k1, where k1 may be one of {0, 1, 2, 3, 4, 5, 6, 7}. In one specific exemplary embodiment, the second comb offset value may be represented as (k1+2)mod K. TC In another specific exemplary embodiment, the second value of the comb offset may be (k1+4) mod K TC In one specific exemplary embodiment, the third value of the comb offset may be (k1+4) mod K TC In another specific exemplary embodiment, the third value of the comb offset may be (k1+2) mod K TC In one specific exemplary embodiment, the fourth value of the comb offset may be (k1+6) mod K TC may be also possible.

[0149] In one specific exemplary embodiment, the second value of the comb offset is (k1+1) mod K TC In another specific exemplary embodiment, the second value of the comb offset may be (k1+2) mod K TC In one specific exemplary embodiment, the third value of the comb offset may be (k1+2) mod K TC In another specific exemplary embodiment, the third value of the comb offset may be (k1+1) mod K TC In one specific exemplary embodiment, the fourth value of the comb offset may be (k1+3) mod K TC may be also possible.

[0150] TIFF2025506475000019.tif93168

[0151] In some embodiments, the parameters "cs_offset 1 / cs_offset 2 / cs_offset 3" may be one of {1,2}. In some embodiments, cs_offset 1, cs_offset 2, and cs_offset 3 may be different from each other. Alternatively, cs_offset 1 may be the same as cs_offset 3. Alternatively, cs_offset 2 may be 0. In one specific and exemplary embodiment, cs_offset 1 and / or cs_offset 3 may be 3 and / or cs_offset 2 may be 0. In another specific and exemplary embodiment, the values ​​of cs_offset1 and / or cs_offset2 and / or cs_offset3 may be pre-determined or configured via DCI and / or MAC CE and / or RRC.

[0152] In the specific exemplary embodiment described above, several rules or parameters (cs_offset, cs_offset 1, cs_offset 2, cs_offset 3) may be defined or implemented for antenna port mapping. It is to be clarified that such rules or parameters may be defined by default. In particular, such rules or parameters may be specified by a wireless organization (e.g., 3GPP), a network operator, a service provider, etc. Alternatively, such rules or parameters may be configured by the network device 110 via an RRC message, a DCI message, a MAC CE message, or any suitable message, etc.

[0153] When to use TD-OCC In addition to the above, the mapping of eight antenna ports for SRS transmission can also be implemented by using TD-OCC, which will be discussed in detail.

[0154] In some embodiments, terminal device 120 (and network device 110) maps the eight antenna ports of the SRS resource to multiple OFDM symbols by using at least one TD-OCC.

[0155] In some embodiments, the terminal device 120 (and the network device 110) may map eight antenna ports to two symbols based on TD-OCC=2. In some embodiments, the terminal device 120 (and the network device 110) may map eight antenna ports to two symbols combined with TD-OCC=2 by using a four-port SRS structure. Specifically, the terminal device 120 (and the network device 110) may map the first four antenna ports based on the TD-OCC of a first time and map the second four antenna ports based on the TD-OCC of a second time, where the length of the first and second TD-OCCs is two. In a specific exemplary embodiment, the first TD-OCC in the two symbols may be {1,1}, while the second TD-OCC in the two symbols may be {1,-1}. FIG. 4A illustrates an example of antenna port mapping 400 when the length of the TD-OCC is two, according to some embodiments of the present disclosure.

[0156] TIFF2025506475000020.tif44168

[0157] In some embodiments, terminal device 120 (and network device 110) may map eight antenna ports to four symbols based on TD-OCC=4. Alternatively, in some other embodiments, terminal device 120 (and network device 110) may map eight antenna ports to four symbols combined with TD-OCC=4 by using a two-port SRS structure. Specifically, terminal device 120 (and network device 110) may map four antenna port sets of eight antenna ports based on four different TD-OCCs of length four, and each of the four antenna port sets may include two antenna ports. In a specific exemplary embodiment, the first TD-OCC in the four symbols may be {1,1,1,1}, the second TD-OCC in the four symbols may be {1,-1,1,-1}, the third TD-OCC in the four symbols may be {1,1,-1,-1} or {1,-1,-1,1}, and the fourth TD-OCC in the four symbols may be {1,-1,-1,1} or {1,1,-1,-1}. Figure 4B illustrates an example of antenna port mapping 450 when the TD-OCC length is four, according to some embodiments of the present disclosure.

[0158] TIFF2025506475000021.tif109168

[0159] It should be clarified that the specific mapping methods shown in Figures 4A and 4B and the specific values ​​of TD-OCC shown in Tables 2-4 are merely for illustrative purposes and do not imply any limitations. In other exemplary embodiments, other suitable mapping schemes for 4-port SRS structure / 2-port SRS structure and other suitable values ​​of TD-OCC may be applied. The present disclosure is not limited in this respect.

[0160] Example process for enhancements regarding SRS capabilities / randomization In general, to obtain orthogonality (between partially overlapping SRSs) based on TD-OCC, the sequences at different symbols need to be the same, while sequence or group hopping is applied for interference randomization. Further enhancements to SRS capabilities / randomization are expected to be discussed in the upcoming 3GPP Release 18. Specifically, it is expected to define the following goals: > Capability: Support TD-OCC technology, while the sequences on different symbols should be designed to obtain orthogonality. > Randomization: Try to introduce dynamic / flexible randomization parameters, e.g. group and / or sequence hopping parameters.

[0161] According to some example embodiments of the present disclosure, the sequence of SRS antenna ports may be the same for OFDM symbols within the length of the TD-OCC, and the sequence of OFDM symbols outside / beyond one TD-OCC length can be different if group hopping or sequence hopping is used. In this way, a tradeoff between capacity requirements and randomization requirements is achieved.

[0162] In some embodiments, terminal device 120 (and network device 110) determines at least one sequence of the TD-OCC for a number of symbols (i.e., orthogonal frequency division multiplexing (OFDM) symbols). In particular, the sequence of SRS antenna ports used within a symbol period is the same, and the symbol period corresponds to a number of OFDM symbols based on the length of the TD-OCC.

[0163] Here, the terminal device 120 transmits an SRS transmission in multiple symbols to the network device 110 based on the determined at least one sequence and the at least one sequence of the TD-OCC.

[0164] In some embodiments, the at least one sequence of the TD-OCC may be determined based on multiple factors. One example of the factor is the length of the TD-OCC. Another example of the factor is a UE-specific parameter or a cell-specific parameter. A further example of the factor is a group hopping or sequence hopping interference randomization parameter.

[0165] In some embodiments, the length of the TD-OCC (denoted as TD) is taken into consideration when determining at least one sequence of the TD-OCC for each symbol.

[0166] TIFF2025506475000022.tif138168

[0167] TIFF2025506475000023.tif139168

[0168] TIFF2025506475000024.tif74168

[0169] TIFF2025506475000025.tif32168

[0170] Other exemplary embodiments for determining the sequence of the TD-OCC are described below.

[0171] TIFF2025506475000026.tif151168

[0172] TIFF2025506475000027.tif153168

[0173] TIFF2025506475000028.tif69168

[0174] TIFF2025506475000029.tif181168

[0175] TIFF2025506475000030.tif188168

[0176] TIFF2025506475000031.tif135168

[0177] TIFF2025506475000032.tif21168

[0178] Furthermore, in related solutions, the pseudo-random sequence for hopping of SRS groups and / or sequences is actually based on cell-specific parameters (e.g., slot index, symbol index). According to some example embodiments of the present disclosure, the interference randomization procedure can also be improved. In particular, an additional parameter (denoted as "R") may be introduced for group and / or sequence hopping to enhance inter-TRP cross-SRS interference.

[0179] TIFF2025506475000033.tif171168

[0180] TIFF2025506475000034.tif177168

[0181] TIFF2025506475000035.tif42168

[0182] Example Process for DMRS Type 1 Transmission As mentioned above, more orthogonal DMRS ports are expected to be introduced in the upcoming Release 18. Specifically, the number of antenna ports for DMRS Type 1 transmission is expected to increase up to 16. A method for designing a CS according to an exemplary embodiment of the present disclosure will be discussed in detail.

[0183] TIFF2025506475000036.tif55168

[0184] TIFF2025506475000037.tif26168

[0185] TIFF2025506475000038.tif28168

[0186] TIFF2025506475000039.tif23168

[0187] TIFF2025506475000040.tif20168

[0188] TIFF2025506475000041.tif34168

[0189] TIFF2025506475000042.tif20168

[0190] In some embodiments, the terminal device 120 (and the network device 110) determines at least one CS for DMRS Type 1 transmission on more than eight antenna ports (e.g., 16 antenna ports). In particular, four CSs of the at least one CS are orthogonal to each other. In one specific exemplary embodiment, the CSs may be orthogonal to each other with a minimum orthonormal length of six.

[0191] TIFF2025506475000043.tif29168

[0192] TIFF2025506475000044.tif59168

[0193] TIFF2025506475000045.tif28168

[0194] TIFF2025506475000046.tif59168

[0195] TIFF2025506475000047.tif114168

[0196] In this way, orthogonality can be achieved within the RB.

[0197] Alternatively, in some embodiments, terminal device 120 (and network device 110) determines at least one CS for DMRS Type 1 transmission on more than eight antenna ports (e.g., 16 antenna ports). In particular, four CSs of the at least one CS are orthogonal to each other. In one specific exemplary embodiment, the CSs may be orthogonal to each other with a minimum orthonormal length of four.

[0198] TIFF2025506475000048.tif26168

[0199] TIFF2025506475000049.tif61168

[0200] In some embodiments, for the first portion (ports {0,1}, port {2,3}, port {4,5}, port {6,7}, etc.), the FD-OCC may be [1,1,1,1] and [1,-1,1,-1], while for the second portion (i.e., newly introduced antenna ports such as ports {8,9}, port {10,11}, port {12,13}, port {14,15}), the FD-OCC may be [1,1,-1,-1] and [1,-1,-1,1].

[0201] TIFF2025506475000050.tif115168

[0202] In this way, orthogonality can be achieved within four consecutive RBs.

[0203] In some embodiments, the orthonormal length may be dynamically determined based on the number of scheduled RBs. Specifically, in some embodiments, when the number of scheduled RBs is odd, the orthonormal length is 6, while when the number of scheduled RBs is even, the orthonormal length is 4.

[0204] In some embodiments, the network device 110 may generate a configuration, where the configuration indicates information regarding at least one antenna port for DMRS transmission and information regarding at least one CS value corresponding to the at least one antenna port. Furthermore, the configuration may be included in an RRC message, a DCI message, a MAC CE message, or any suitable message.

[0205] TIFF2025506475000051.tif28168

[0206] TIFF2025506475000052.tif104168

[0207] In this way, more flexibility can be achieved in scheduling DMRS transmissions based on different configurations / scheduling.

[0208] According to some example embodiments of this disclosure, a shorter orthonormal length may be achieved by sacrificing some transmission resources.

[0209] TIFF2025506475000053.tif180168

[0210] In this way, orthogonality can be achieved within RBs regardless of the number of scheduled RBs.

[0211] Example Process for DMRS Transmission Type 2 As mentioned above, more orthogonal DMRS ports are expected to be introduced in the upcoming Release 18. Specifically, the number of antenna ports for DMRS Type 2 transmission is expected to increase up to 24. A method for designing a CS according to some example embodiments of the present disclosure will be discussed in detail.

[0212] In some embodiments, terminal device 120 (and network device 110) determines at least one FD-OCC for DMRS Type 2 transmission over more than 12 antenna ports (e.g., 24 antenna ports). In particular, the at least one FD-OCC has a length of 4. Table 12 below shows a mapping structure for DMRS Type 2. Table 12 shows the mapping structure of DMRS type 2. [Table 1]

[0213] Table 13 below shows another mapping structure for DMRS Type 2. Table 13 shows the mapping structure of DMRS type 2. [Table 2]

[0214] In the above Table 13, the mapping structure of ports 1-11 is the same as the currently proposed mapping structure, thus achieving better backward compatibility.

[0215] Table 14 below shows a further mapping structure for DMRS Type 2. Table 14 shows the mapping structure of DMRS type 2. [Table 3]

[0216] In the above Table 14, the mapping structure for ports 1-11 is redefined. From this point on, such a DMRS transmission may be referred to as a new DMRS type, for example, DMRS Type 3.

[0217] According to the above exemplary process, more orthogonal DMRS ports can be achieved.

[0218] Example Process for Indicating DMRS Information To achieve more flexible scheduling and support more DMRS antenna ports, the network device 110 may indicate DMRS information to the terminal device 120 .

[0219] In some embodiments, the network device 110 may transmit the configuration for DMRS transmission to the terminal device 120. Further, the configuration may be included in an RRC message, a DCI message, a MAC CE message, or any appropriate message.

[0220] In some embodiments, the configuration indicates information about the length of the FD-OCC configured for at least one antenna port and corresponding to the at least one antenna port. In a specific exemplary embodiment, the configuration indicates information about one or more downlink DMRS ports and the length of the OCC (either TD-OCC or FD-OCC). By indicating the downlink DMRS port and the length of the OCC together, the terminal device can properly understand the interference cancellation information. For example, the first instruction indicates DMRS port (0,1) with FD-OCC=2, and the second instruction indicates DMRS port (0,1) with FD-OCC=4 (or CS value {0,6}). When the terminal device 120 receives the second instruction, the terminal device 120 understands that the current DMRS transmission will be performed on more DMRS ports. Then, the terminal device 120 may perform interference cancellation on the newly introduced DMRS ports.

[0221] Alternatively or additionally, in some other embodiments, the configuration indicates information regarding antenna port groups that are scheduled for DMRS transmission. Specifically, the concept of DMRS port groups may be introduced. For example, for DMRS type 1, there may be two groups: DMRS port group 1 for ports {0-7} and DMRS port group 2 for ports {8-15}. For DMRS type 2, there may be two groups: DMRS port group 1 for ports {0-11} and DMRS port group 2 for ports {12-23}.

[0222] After receiving the information about the DMRS port group, the DMRS port indication table may be applied accordingly, thereby reducing signaling overhead.

[0223] Example Process Showing Phase Tracking RS (PTRS) Currently, PTRS is introduced to enable compensation of oscillator phase noise. As mentioned above, the number of antenna ports for DMRS type 1 transmission is expected to increase up to 16, and the number of antenna ports for DMRS type 2 transmission is expected to increase up to 24. In this case, it is necessary to discuss how to configure PTRS resources (=PTRS ports) for the newly introduced antenna ports.

[0224] In some embodiments, a port of a PTRS may correspond to one or more DMRS ports, and the DMRS port to which the PTRS port is mapped may be indicated by information indicating the offset of the RE to which the PTRS is mapped, and this information may be included in the RRC message.

[0225] Tables 15 and 16 below show the association of DMRS antenna ports with RE offsets for DMRS Type 1 transmission. [Table 4] [Table 5] [Table 6]

[0226] In this way, the oscillator phase noise can be properly cancelled for the newly introduced DMRS antenna port.

[0227] Exemplary Methods 5 illustrates a flowchart of an example method 500 according to some embodiments of the present disclosure. For example, the method 500 may be implemented in the terminal device 120 as shown in FIG.

[0228] In block 510, the terminal device 120 determines at least one CS for SRS transmission on four antenna ports, including at least one first CS corresponding to a first set of four antenna ports or corresponding to the at least one first set of REs configured for SRS transmission, and at least one second CS corresponding to a second set of four antenna ports or corresponding to the at least one second set of REs configured for SRS transmission, where the at least one second CS is different from the at least one first CS.

[0229] In block 510, the terminal device 120 transmits an SRS transmission to the network device 110 on comb structure resources with a comb value of 8 based on the at least one first CS and the at least one second CS.

[0230] In some embodiments, the terminal device 120 determines an offset value for calculating either the at least one first CS or the at least one second CS such that the at least one second CS is different from the at least one first CS.

[0231] In some embodiments, the offset value is predefined or determined from a setting from the network device 110 .

[0232] In some embodiments, the maximum number of values ​​for at least one CS is six.

[0233] 6 illustrates a flowchart of an example method 600 according to some embodiments of the present disclosure. For example, the method 600 may be implemented in the terminal device 120 as illustrated in FIG.

[0234] In block 610, the terminal device 120 maps the eight antenna ports to the comb structure resources according to the comb values ​​of the comb structure resources such that at least two sets of REs based on the first comb offset and the second comb offset are associated with different CSs or different CS sets, or at least two portions of the eight antenna ports of the SRS resources are associated with different CSs or different CS sets.

[0235] In block 620, terminal device 120 transmits an SRS transmission to network device 110 on comb structure resources.

[0236] In some embodiments, at least two sets of REs are adjacent REs.

[0237] In some embodiments, the comb value of the comb structure resource is one of the following: {2, 4, 8}.

[0238] In some embodiments, when the comb value of the comb structure resource is 2, the maximum number of different CS values ​​is 8, when the comb value of the comb structure resource is 4, the maximum number of different CS values ​​is 12, and when the comb value of the comb structure resource is 8, the maximum number of different CS values ​​is 6.

[0239] In some embodiments, when the comb value of the comb structure resource is 2, the terminal device 120 maps a first portion of the eight antenna ports to a first set of REs based on a first comb offset, the first portion of the eight antenna ports or the first set of REs is associated with a first CS set, and maps a second portion of the eight antenna ports to a second set of REs based on a second comb offset, the second portion of the eight antenna ports or the second set of REs is associated with a second CS set that is the same as or different from the first CS set.

[0240] In some embodiments, when the comb value of the comb structure resource is 2, the terminal device 120 maps 8 antenna ports to the same RE, and each of the 8 antenna ports is associated with a respective CS.

[0241] In some embodiments, the terminal device 120 maps four antenna port sets of eight antenna ports to four different sets of REs based on four comb offset values, respectively, where each of the four antenna port sets includes two antenna ports, and different antenna port sets of the four antenna port sets or different sets of REs are associated with different CS sets.

[0242] In some embodiments, when the comb value of the comb structure resource is 4, the terminal device 120 maps two antenna port sets of 8 antenna ports to two different sets of REs based on the first comb offset and the second comb offset, and each of the two antenna port sets includes four antenna ports, and different antenna port sets or different sets of REs of the two antenna port sets are associated with different CS sets.

[0243] In some embodiments, if the comb value of the comb structure resource is 8, terminal device 120 maps the 8 antenna ports to 8 different sets of REs based on the 8 respective comb offset values.

[0244] In some embodiments, when the comb value of the comb structure resource is 8, the terminal device 120 maps two antenna port sets of 8 antenna ports to two different sets of REs based on the first comb offset and the second comb offset, and each of the two antenna port sets includes four antenna ports, and different antenna port sets or different sets of REs of the two antenna port sets are associated with different CS sets.

[0245] In some embodiments, when the comb value of the comb structure resource is 8, the terminal device 120 maps the four antenna port sets of the eight antenna ports to four different sets of REs based on the four respective comb offset values, and each of the four antenna port sets includes two antenna ports, and different antenna port sets of the four antenna port sets or different sets of REs are associated with different CS sets.

[0246] 7 illustrates a flowchart of an example method 700 according to some embodiments of the present disclosure. For example, the method 700 may be implemented in the terminal device 120 as shown in FIG.

[0247] In block 710, terminal device 120 determines at least one value of TD-OCC for a number of symbols. The sequence of SRS antenna ports used within a symbol period corresponding to the number of OFDM symbols based on the length of the TD-OCC is the same.

[0248] At block 720, terminal device 120 transmits an SRS transmission over multiple symbols based on the determined at least one value of OCC.

[0249] In some embodiments, the terminal device 120 determines at least one sequence of the TD-OCC based on at least one of a length of the TD-OCC, a UE-specific parameter, a cell-specific parameter, or an interference randomization parameter for group hopping or sequence hopping.

[0250] 8 illustrates a flowchart of an example method 800 according to some embodiments of the present disclosure. For example, the method 800 may be implemented in a terminal device 120 as shown in FIG.

[0251] In block 810, terminal device 120 maps the eight antenna ports of the SRS resource to multiple REs and / or multiple OFDM symbols by using at least one TD-OCC.

[0252] At block 820, terminal device 120 sends an SRS transmission on multiple REs and / or multiple OFDM symbols to network device 110.

[0253] In some embodiments, the terminal device 120 maps the first four antenna ports based on the first TD-OCC and maps the second four antenna ports based on the second TD-OCC, and the length of the first and second TD-OCCs is 2.

[0254] In some embodiments, terminal device 120 maps four antenna port sets of eight antenna ports based on four different TD-OCCs of length four, where each of the four antenna port sets includes two antenna ports.

[0255] 9 illustrates a flowchart of an example method 900 according to some embodiments of the present disclosure. For example, the method 900 may be implemented in a terminal device 120 such as that illustrated in FIG.

[0256] In block 910, terminal device 120 determines at least one CS for DMRS transmission type 1 on more than eight antenna ports. The four CSs of the at least one CS are orthonormal to each other with a minimum orthonormal length of four or six.

[0257] At block 910 , terminal device 120 performs DMRS transmission with network device 110 .

[0258] In some embodiments, the orthonormal length is six when the number of scheduled RBs is odd, and the orthonormal length is four when the number of scheduled RBs is even.

[0259] In some embodiments, terminal device 120 receives a configuration from network device 110. The configuration indicates information regarding at least one antenna port for DMRS transmission and at least one cyclic shift value corresponding to the at least one antenna port.

[0260] In some embodiments, when the maximum number of values ​​for at least one CS is 6, the set of CS values ​​is one of {0, 1, 3, 4} or {0, 2, 3, 5}.

[0261] In some embodiments, when the maximum number of values ​​of at least one CS is 12, the set of CS values ​​is one of {0, 2, 6, 8} or {0, 4, 6, 10}, {0, 3, 6, 9}.

[0262] 10 illustrates a flowchart of an example method 1000 according to some embodiments of the present disclosure. For example, the method 1000 may be implemented in a terminal device 120 as illustrated in FIG.

[0263] At block 1010, terminal device 120 determines at least one FD-OCC for DMRS transmission type 2 on more than 12 antenna ports. The at least one FD-OCC has a length of four.

[0264] At block 1020 , terminal device 120 performs DMRS transmission with network device 110 .

[0265] 11 illustrates a flowchart of an example method 1100 according to some embodiments of the present disclosure. For example, the method 1100 may be implemented in a terminal device 120 as illustrated in FIG.

[0266] In block 1110, the terminal device 120 receives a configuration for DMRS transmission from the network device 110. The configuration indicates at least one of information configured for the at least one antenna port, on a length of the FD-OCC corresponding to the at least one antenna port, or information on an antenna port group scheduled for DMRS transmission.

[0267] In block 1120, the terminal device 120 performs DRMS ​​transmission with the network device 110 based on the settings.

[0268] 12 illustrates a flowchart of an example method 1200 according to some embodiments of the present disclosure. For example, the method 1200 may be implemented in the network device 110 as illustrated in FIG.

[0269] At block 1210, the network device 110 determines at least one CS for SRS transmission on four antenna ports, including at least one first CS corresponding to a first set of four antenna ports or corresponding to a first set of REs configured for SRS transmission, and at least one second CS corresponding to a second set of four antenna ports or corresponding to a second set of REs configured for SRS transmission, where the at least one second CS is different from the at least one first CS.

[0270] At block 1220, network device 110 receives an SRS transmission from terminal device 120 on comb structure resources with comb value 8 based on the at least one first CS and the at least one second CS.

[0271] In some embodiments, the network device 110 determines an offset value for calculating either the at least one first CS or the at least one second CS such that the at least one second CS is different from the at least one first CS.

[0272] In some embodiments, the offset value is predefined or determined by the network device 110 .

[0273] In some embodiments, the maximum number of values ​​of the at least one cyclic shift is six.

[0274] 13 illustrates a flowchart of an example method 1300 according to some embodiments of the present disclosure. For example, the method 1300 may be implemented in the network device 110 as shown in FIG.

[0275] In block 1310, the network device 110 maps the eight antenna ports to the comb structure resources according to the comb values ​​of the comb structure resources, such that at least two sets of REs based on at least two comb offset values ​​are associated with different CSs or different CS sets, or at least two portions of the eight antenna ports of the SRS resources are associated with different CSs or different CS sets.

[0276] At block 1320, the network device 110 receives an SRS transmission from the terminal device 120 on the comb structure resources.

[0277] In some embodiments, at least two sets of REs are adjacent REs.

[0278] In some embodiments, the comb value of the comb structure resource is one of the following: {2, 4, 8}.

[0279] In some embodiments, when the comb value of the comb structure resource is 2, the maximum number of different CS values ​​is 8, when the comb value of the comb structure resource is 4, the maximum number of different CS values ​​is 12, and when the comb value of the comb structure resource is 8, the maximum number of different CS values ​​is 6.

[0280] In some embodiments, when the comb value of the comb structure resource is 2, the network device 110 maps a first portion of the eight antenna ports to a first set of REs based on a first comb offset, the first portion of the eight antenna ports or the first set of REs is associated with a first CS set, and maps a second portion of the eight antenna ports to a second set of REs based on a second comb offset, the second portion of the eight antenna ports or the second set of REs is associated with a second CS set that is the same as or different from the first CS set.

[0281] In some embodiments, when the comb value of the comb structure resource is 2, the network device 110 maps 8 antenna ports to the same RE, and each antenna port of the 8 antenna ports is associated with a respective CS.

[0282] In some embodiments, when the comb value of the comb structure resource is 4, the network device 110 maps the four antenna port sets of the eight antenna ports to four different sets of REs based on the four respective comb offset values. Furthermore, each of the four antenna port sets includes two antenna ports, and different antenna port sets of the four antenna port sets or the four sets of REs are associated with different CS sets.

[0283] In some embodiments, when the comb value of the comb structure resource is 4, the network device 110 maps two antenna port sets of 8 antenna ports to two different sets of REs based on the first comb offset and the second comb offset, and each of the two antenna port sets includes four antenna ports, and different antenna port sets or different sets of REs of the two antenna port sets are associated with different CS sets.

[0284] In some embodiments, if the comb value of the comb structure resource is 8, the network device 110 maps the 8 antenna ports to 8 different sets of REs based on the 8 respective comb offset values.

[0285] In some embodiments, when the comb value of the comb structure resource is 8, the network device 110 maps two antenna port sets of 8 antenna ports to two different sets of REs based on the first comb offset and the second comb offset, and each of the two antenna port sets includes four antenna ports, and different antenna port sets or different sets of REs of the two antenna port sets are associated with different CS sets.

[0286] In some embodiments, when the comb value of the comb structure resource is 8, the network device 110 maps the four antenna port sets of the eight antenna ports to four different sets of REs based on the four respective comb offsets. Furthermore, each of the four antenna port sets includes two antenna ports, and different antenna port sets of the four antenna port sets or different sets of REs are associated with different CS sets.

[0287] 14 illustrates a flowchart of an example method 1400 according to some embodiments of the present disclosure. For example, the method 1400 may be implemented in the network device 110 as shown in FIG.

[0288] In block 1410, the network device 110 determines at least one sequence of the TD-OCC for a number of symbols. The sequence of SRS antenna ports used within a symbol period corresponding to the number of OFDM symbols based on the length of the TD-OCC is the same.

[0289] At block 1420, the network device 110 receives an SRS transmission over a number of symbols based on the determined at least one value of the OCC.

[0290] In some embodiments, the network device 110 determines at least one sequence of the TD-OCC based on at least one of a length of the TD-OCC, a UE-specific parameter, a cell-specific parameter, or an interference randomization parameter for group hopping or sequence hopping.

[0291] 15 illustrates a flowchart of an example method 1500 according to some embodiments of the present disclosure. For example, the method 1500 may be implemented in the network device 110 as shown in FIG.

[0292] At block 1510, the network device 110 maps the eight antenna ports of the SRS resource to multiple REs and / or multiple OFDM symbols by using at least one TD-OCC.

[0293] At block 1520, network device 110 receives an SRS transmission from terminal device 120 on multiple REs and / or multiple OFDM symbols.

[0294] In some embodiments, the network device 110 maps the first four antenna ports based on a first TD-OCC and maps the second four antenna ports based on a second TD-OCC, and the length of the first and second TD-OCCs is 2.

[0295] In some embodiments, the network device 110 maps four antenna port sets of eight antenna ports based on four different TD-OCCs of length four, where each of the four antenna port sets includes two antenna ports.

[0296] 16 illustrates a flowchart of an example method 1600 according to some embodiments of the present disclosure. For example, the method 1600 may be implemented in the network device 110 as illustrated in FIG.

[0297] In block 1610, the network device 110 determines at least one CS for DMRS transmission type 1 on more than eight antenna ports. The four CSs of the at least one CS are orthonormal to each other with a minimum orthonormal length of four or six.

[0298] At block 1620 , network device 110 performs DMRS transmission with terminal device 120 .

[0299] In some embodiments, the orthonormal length is six when the number of scheduled RBs is odd, and the orthonormal length is four when the number of scheduled RBs is even.

[0300] In some embodiments, the network device 110 sends a configuration to the terminal device 120. The configuration indicates information regarding at least one antenna port for DMRS transmission and at least one CS value corresponding to the at least one antenna port.

[0301] In some embodiments, when the maximum number of values ​​for at least one CS is 6, the set of CS values ​​is one of {0, 1, 3, 4} or {0, 2, 3, 5}.

[0302] In some embodiments, when the maximum number of values ​​of at least one CS is 12, the set of VS values ​​is one of {0, 2, 6, 8} or {0, 4, 6, 10}, {0, 3, 6, 9}.

[0303] 17 illustrates a flowchart of an example method 1700 according to some embodiments of the present disclosure. For example, the method 1700 may be implemented in the network device 110 as shown in FIG.

[0304] At block 1710, the network device 110 determines at least one FD-OCC for DMRS transmission type 2 on more than 12 antenna ports. The at least one FD-OCC has a length of four.

[0305] At block 1720 , network device 110 performs DMRS transmission with terminal device 120 .

[0306] 18 illustrates a flowchart of an example method 1800 according to some embodiments of the present disclosure. For example, the method 1800 may be implemented in the network device 110 as shown in FIG.

[0307] In block 1810, the network device 110 transmits a configuration for DMRS transmission to the terminal device 120. The configuration indicates at least one of information configured for the at least one antenna port, information on a length of the FD-OCC corresponding to the at least one antenna port, or information on an antenna port group scheduled for DMRS transmission.

[0308] In block 1820, the network device 110 performs DRMS ​​transmission with the terminal device 120 based on the configuration.

[0309] Exemplary Apparatus In some exemplary embodiments, terminal device 120 includes circuitry configured to determine at least one CS for SRS transmission on four antenna ports, including at least one first CS and at least one second CS, and transmit the SRS transmission to network device 110 on comb structure resources of comb value 8 based on the at least one first CS and the at least one second CS. The at least one first CS corresponds to a first set of four antenna ports or corresponds to at least one first RE configured for SRS transmission, the at least one second CS corresponds to a second set of four antenna ports or corresponds to at least one second RE configured for SRS transmission, and the at least one second CS is different from the at least one first CS.

[0310] In some embodiments, the circuitry is further configured to determine an offset value for calculating either the at least one first CS or the at least one second CS such that the at least one second CS differs from the at least one first CS.

[0311] In some embodiments, the offset value is predefined or determined from a setting from the network device 110 .

[0312] In some embodiments, the maximum number of values ​​for at least one CS is six.

[0313] In some exemplary embodiments, the terminal device 120 includes circuitry configured to map eight antenna ports to the comb structure resources according to the comb values ​​of the comb structure resources, such that at least two REs based on different comb offset values ​​are associated with different CSs or different CS sets, or at least two portions of the eight antenna ports of the SRS resources are associated with different CSs or different CS sets, and to transmit an SRS transmission on the comb structure resources to the network device 110.

[0314] In some embodiments, the at least two REs are two adjacent REs.

[0315] In some embodiments, the comb value of the comb structure resource is one of the following: {2, 4, 8}.

[0316] In some embodiments, when the comb value of the comb structure resource is 2, the maximum number of different CS values ​​is 8, when the comb value of the comb structure resource is 4, the maximum number of different CS values ​​is 12, and when the comb value of the comb structure resource is 8, the maximum number of different CS values ​​is 6.

[0317] In some embodiments, the circuitry is further configured to map a first portion of the eight antenna ports to a first set of REs based on a first comb offset and map a second portion of the eight antenna ports to a second set of REs based on a second comb offset when the comb value of the comb structure resource is 2. The first portion of the eight antenna ports or the first set of REs is associated with a first CS set. The second portion of the eight antenna ports or the second set of REs is associated with a second CS set, which may be the same as or different from the first CS set.

[0318] In some embodiments, the circuitry is further configured to map 8 antenna ports to the same RE when the comb value of the comb structure resource is 2. Each antenna port of the 8 antenna ports is associated with a respective CS.

[0319] In some embodiments, the circuitry is further configured to map four antenna port sets of the eight antenna ports to four different sets of REs based on the four comb offset values ​​when the comb value of the comb structure resource is 4. Further, each of the four antenna port sets includes two antenna ports, and different antenna port sets of the four antenna port sets or different sets of REs are associated with different CS sets.

[0320] In some embodiments, the circuitry is further configured to map the two antenna port sets of 8 antenna ports to two different sets of REs based on the first comb offset and the second comb offset when the comb value of the comb structure resource is 4. Further, each of the two antenna port sets includes four antenna ports, and different antenna port sets of the two antenna port sets or different sets of REs are associated with different CS sets.

[0321] In some embodiments, the circuitry is further configured to, when the comb value of the comb structure resource is eight, map the eight antenna ports to eight different sets of REs based on the eight comb offset values, respectively.

[0322] In some embodiments, the circuitry is further configured to map the two antenna port sets of 8 antenna ports to two different sets of REs based on the first comb offset and the second comb offset when the comb value of the comb structure resource is 8. Further, each of the two antenna port sets includes four antenna ports, and different antenna port sets of the two antenna port sets or different sets of REs are associated with different CS sets.

[0323] In some embodiments, the circuitry is further configured to map four antenna port sets of the eight antenna ports to four different sets of REs based on the four comb offset values, respectively, when the comb value of the comb structure resource is 8. Further, each of the four antenna port sets includes two antenna ports, and different antenna port sets of the four antenna port sets or different sets of REs are associated with different CS sets.

[0324] In some exemplary embodiments, terminal device 120 includes circuitry configured to determine at least one sequence of TD-OCC for a plurality of symbols and transmit an SRS transmission over a plurality of symbols based on the determined at least one value of OCC, where the sequence of SRS antenna ports used within a symbol period corresponding to a number of OFDM symbols based on the length of the TD-OCC is the same.

[0325] In some embodiments, the circuitry is further configured to determine at least one sequence of the TD-OCC based on at least one of a length of the TD-OCC, a UE-specific parameter, a cell-specific parameter, or an interference randomization parameter for group hopping or sequence hopping.

[0326] In some exemplary embodiments, the terminal device 120 includes circuitry configured to map eight antenna ports of SRS resources based on at least one TD-OCC and send an SRS transmission to the network device 110 in a plurality of ODFM symbols.

[0327] In some embodiments, the circuitry is further configured to map the first four antenna ports based on the first TD-OCC and map the second four antenna ports based on the second TD-OCC, where the length of the first and second TD-OCCs is 2.

[0328] In some embodiments, the circuitry is further configured to map four antenna port sets of the eight antenna ports based on four different TD-OCCs of length 4. Each of the four antenna port sets includes two antenna ports.

[0329] In some exemplary embodiments, terminal device 120 includes circuitry configured to determine at least one CS for DMRS transmission type 1 on more than eight antenna ports and to perform DMRS transmission with network device 110. The four CSs of the at least one CS are orthonormal to each other with a minimum orthonormal length of 4 or 6.

[0330] In some embodiments, the orthonormal length is six when the number of scheduled RBs is odd, and the orthonormal length is four when the number of scheduled RBs is even.

[0331] In some embodiments, the circuitry is further configured to receive a configuration from the network device 110. The configuration indicates information regarding at least one antenna port for DMRS transmission and information regarding at least one cyclic shift value corresponding to the at least one antenna port.

[0332] In some embodiments, when the maximum number of values ​​for at least one CS is 6, the set of CS values ​​is one of {0, 1, 3, 4} or {0, 2, 3, 5}.

[0333] In some embodiments, when the maximum number of values ​​of at least one CS is 12, the set of CS values ​​is one of {0, 2, 6, 8} or {0, 4, 6, 10}, {0, 3, 6, 9}.

[0334] In some exemplary embodiments, terminal device 120 includes circuitry configured to determine at least one FD-OCC for DMRS transmission type 2 on more than 12 antenna ports and to perform DMRS transmission with network device 110. The at least one FD-OCC has a length of 4.

[0335] In some exemplary embodiments, terminal device 120 includes circuitry configured to receive a configuration for DMRS transmission from network device 110 and to perform DMRS transmission with network device 110 based on the configuration, where the configuration indicates at least one of information configured for at least one antenna port, information regarding a length of the FD-OCC corresponding to the at least one antenna port, or information regarding an antenna port group scheduled for DMRS transmission.

[0336] In some exemplary embodiments, network device 110 includes circuitry configured to determine at least one CS for SRS transmission on four antenna ports, including at least one first CS and at least one second CS, and receive SRS transmission on comb structure resources of comb value 8 from terminal device 120 based on the at least one first CS and the at least one second CS. The at least one first CS corresponds to a first set of four antenna ports or corresponds to at least one first RE configured for SRS transmission, the at least one second CS corresponds to a second set of four antenna ports or corresponds to at least one second RE configured for SRS transmission, and the at least one second CS is different from the at least one first CS.

[0337] In some embodiments, the circuitry is further configured to determine an offset value for calculating either the at least one first CS or the at least one second CS such that the at least one second CS differs from the at least one first CS.

[0338] In some embodiments, the offset value is predefined or determined by the network device 110 .

[0339] In some embodiments, the maximum number of values ​​of the at least one cyclic shift is six.

[0340] In some exemplary embodiments, the network device 110 includes circuitry configured to map eight antenna ports to the comb structure resources according to a comb value of the comb structure resources, such that at least two sets of REs based on different comb offset values ​​are associated with different CSs or different CS sets, or at least two portions of the eight antenna ports of the SRS resources are associated with different CSs or different CS sets, and receive an SRS transmission from the terminal device 120 on the comb structure resources.

[0341] In some embodiments, the at least two REs are two adjacent REs.

[0342] In some embodiments, the comb value of the comb structure resource is one of the following: {2, 4, 8}.

[0343] In some embodiments, when the comb value of the comb structure resource is 2, the maximum number of different CS values ​​is 8, when the comb value of the comb structure resource is 4, the maximum number of different CS values ​​is 12, and when the comb value of the comb structure resource is 8, the maximum number of different CS values ​​is 6.

[0344] In some embodiments, the circuitry is further configured to map a first portion of the eight antenna ports to a first set of REs based on a first comb offset and map a second portion of the eight antenna ports to a second set of REs based on a second comb offset when the comb value of the comb structure resource is 2. The first portion of the eight antenna ports or the first set of REs is associated with a first CS set. The second portion of the eight antenna ports or the second set of REs is associated with a second CS set, which may be the same as or different from the first CS set.

[0345] In some embodiments, the circuitry is further configured to map 8 antenna ports to the same RE when the comb value of the comb structure resource is 2. Each antenna port of the 8 antenna ports is associated with a respective CS.

[0346] In some embodiments, the circuitry is further configured to map four antenna port sets of the eight antenna ports to four different sets of REs based on the four comb offset values ​​when the comb value of the comb structure resource is 4. Further, each of the four antenna port sets includes two antenna ports, and different antenna port sets of the four antenna port sets or different sets of REs are associated with different CS sets.

[0347] In some embodiments, the circuitry is further configured to map the two antenna port sets of 8 antenna ports to two different sets of REs based on the first comb offset and the second comb offset when the comb value of the comb structure resource is 4. Further, each of the two antenna port sets includes four antenna ports, and different antenna port sets of the two antenna port sets or different sets of REs are associated with different CS sets.

[0348] In some embodiments, the circuitry is further configured to, when the comb value of the comb structure resource is eight, map the eight antenna ports to eight different sets of REs based on the eight comb offset values, respectively.

[0349] In some embodiments, the circuitry is further configured to map the two antenna port sets of 8 antenna ports to two different sets of REs based on the first comb offset and the second comb offset when the comb value of the comb structure resource is 8. Further, each of the two antenna port sets includes four antenna ports, and different antenna port sets of the two antenna port sets or different sets of REs are associated with different CS sets.

[0350] In some embodiments, the circuitry is further configured to map four antenna port sets of the eight antenna ports to four different sets of REs based on the four comb offset values, respectively, when the comb value of the comb structure resource is 8. Further, each of the four antenna port sets includes two antenna ports, and different antenna port sets of the four antenna port sets or different sets of REs are associated with different CS sets.

[0351] In some exemplary embodiments, the network device 110 includes circuitry configured to determine at least one sequence of TD-OCC for a plurality of symbols and receive an SRS transmission over a plurality of symbols based on the determined at least one value of OCC, wherein the sequence of SRS antenna ports used within a symbol period corresponding to a number of OFDM symbols based on the length of the TD-OCC is the same.

[0352] In some embodiments, the circuitry is further configured to determine at least one sequence of the TD-OCC based on at least one of a length of the TD-OCC, a UE-specific parameter, a cell-specific parameter, or an interference randomization parameter for group hopping or sequence hopping.

[0353] In some exemplary embodiments, the network device 110 includes circuitry configured to map the eight antenna ports of the SRS resource to multiple REs and / or multiple OFDM symbols based on at least one TD-OCC, and to receive an SRS transmission from the terminal device 120 over the multiple OFDM symbols.

[0354] In some embodiments, the circuitry is further configured to map the first four antenna ports based on the first TD-OCC and map the second four antenna ports based on the second TD-OCC, where the length of the first and second TD-OCCs is 2.

[0355] In some embodiments, the circuitry is further configured to map four antenna port sets of the eight antenna ports based on four different TD-OCCs of length 4. Each of the four antenna port sets includes two antenna ports.

[0356] In some exemplary embodiments, network device 110 includes circuitry configured to determine at least one CS for DMRS transmission type 1 on more than eight antenna ports and perform DMRS transmission with terminal device 120. The four CSs of the at least one CS are orthonormal to each other with a minimum orthonormal length of four or six.

[0357] In some embodiments, the orthonormal length is six when the number of scheduled RBs is odd, and the orthonormal length is four when the number of scheduled RBs is even.

[0358] In some embodiments, the circuitry is further configured to transmit a configuration to the terminal device 120. The configuration indicates information regarding at least one antenna port for DMRS transmission and at least one CS value corresponding to the at least one antenna port.

[0359] In some embodiments, when the maximum number of values ​​for at least one CS is 6, the set of CS values ​​is one of {0, 1, 3, 4} or {0, 2, 3, 5}.

[0360] In some embodiments, when the maximum number of values ​​of at least one CS is 12, the set of VS values ​​is one of {0, 2, 6, 8} or {0, 4, 6, 10}, {0, 3, 6, 9}.

[0361] In some exemplary embodiments, network device 110 includes circuitry configured to determine at least one FD-OCC for DMRS transmission type 2 on more than 12 antenna ports and to perform DMRS transmission with terminal device 120. The at least one FD-OCC has a length of 4.

[0362] In some exemplary embodiments, network device 110 includes circuitry configured to transmit a configuration for DMRS transmission to terminal device 120 and perform DMRS transmission with terminal device 120 based on the configuration, where the configuration indicates at least one of information configured for at least one antenna port, a length of FD-OCC corresponding to the at least one antenna port, or information regarding an antenna port group scheduled for DMRS transmission.

[0363] 19 is a schematic block diagram of an apparatus 1900 suitable for implementing embodiments of the present disclosure. The apparatus 1900 may be considered as a further exemplary implementation of the terminal device 120 and the network device 110 shown in FIG. 1. Thus, the apparatus 1900 may be implemented in, or at least as part of, the terminal device 120 and the network device 110.

[0364] As shown in the figure, the apparatus 1900 includes a processor 1919, a memory 1920 coupled to the processor 1919, a suitable transmitter (TX) and receiver (RX) 1940 coupled to the processor 1919, and a communication interface coupled to the TX / RX 1940. The memory 1919 stores at least a portion of a program 1930. The TX / RX 1940 is for bidirectional communication. The TX / RX 1940 has at least one antenna to facilitate communication, although in practice the access nodes discussed herein may have multiple antennas. The communication interface may represent any interface required for communication with other network elements, such as an X2 interface for bidirectional communication between eNBs, an S1 interface for communication between a Mobility Management Entity (MME) / Serving Gateway (S-GW) and an eNB, an Un interface for communication between an eNB and a Relay Node (RN), or an Uu interface for communication between an eNB and a terminal device.

[0365] The program 1930 may be considered to include program instructions that, when executed by an associated processor 1910, enable the device 1900 to operate in accordance with embodiments of the present disclosure, as discussed herein with reference to FIGS. 1-18. The embodiments of the present disclosure may be implemented by computer software, hardware, or a combination of software and hardware executable by the processor 1910 of the device 1900. The processor 1910 may be configured to implement various embodiments of the present disclosure. The combination of the processor 1910 and the memory 1920 may also constitute a processing means 1950 suitable for implementing embodiments of the present disclosure.

[0366] The memory 1920 may be of any type suitable for the local technology network and may be implemented by any suitable data storage technology, including, but not limited to, computer-readable non-transitory storage media, semiconductor-based storage devices, magnetic storage devices and systems, optical storage devices and systems, fixed and removable memories, etc. Although only one memory 1920 is shown in the device 1900, multiple physically distinct memory modules may be installed in the device 1900. The processor 1910 may be of any type suitable for the local technology network and may include, but is not limited to, one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs), and processors based on multi-core processor configurations. The device 1900 may have multiple processors, for example application specific integrated circuit chips time-slaved to a clock synchronous with a master processor.

[0367] In general, various embodiments of the present disclosure may be implemented by hardware or special purpose circuits, software, logic, or any combination thereof. Some aspects may be implemented by hardware, and other aspects may be implemented by firmware or software that may be executed by a controller, microprocessor, or other computing device. Various aspects of the embodiments of the present disclosure have been shown and described as block diagrams, flow charts, or illustrated by some other pictorial representation, and it will be understood that the blocks, apparatus, systems, techniques, or methods described herein may be implemented by, for example, but not limited to, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing device, or combinations thereof.

[0368] The present disclosure further provides at least one computer program product tangibly stored in a computer readable non-transitory storage medium. The computer program product includes computer executable instructions, such as instructions included in program modules. The instructions execute on a target real or virtual processor device to perform processes or methods, such as those described above with reference to Figures 5-18. Typically, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks or implement particular abstract data types. In various embodiments, the functionality of the program modules may be combined or split among program modules as desired. The machine readable instructions of the program modules may be executed in local or distributed devices. In distributed devices, the program modules may be located in both local and remote storage media.

[0369] The program codes for carrying out the methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, a special purpose computer or other programmable data processing apparatus, and when the program codes are executed by the processor or controller, the functions / operations specified in the flowcharts and / or block diagrams are performed. The program codes may run entirely on the machine, partially on the machine, as a separate software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0370] The above program code may be embodied on a machine-readable medium, which may be any tangible medium that contains or stores a program used by or in conjunction with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable-programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0371] It should be understood that although operations have been described in a particular order, it is not required that such operations be performed in the particular order or sequence shown, or that all of the operations shown be performed, in order to achieve desired results. In some situations, multitasking and parallel processing may be advantageous. Similarly, although the above discussion includes some specific implementation details, these should not be construed as limitations on the scope of the disclosure, but rather as descriptions of features that may be specific to certain embodiments. Some features that are described in the context of individual embodiments may be implemented in combination in an embodiment. Conversely, various features that are described in the context of an embodiment may be implemented in multiple embodiments, either individually or in any suitable subcombination.

[0372] Although the present disclosure has been described in language specific to structural features and / or methodological acts, it is to be understood that the present disclosure, as defined by the appended claims, is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

1. A terminal device, means for determining a plurality of resources for a demodulation reference signal (DMRS) of a configuration type 1 having 16 antenna ports, including a first subset of antenna ports with indexes {0, 1, 2, 3, 4, 5, 6, 7} and a second subset of antenna ports with indexes {8, 9, 10, 11, 12, 13, 14, 15}, based on 16 vectors respectively corresponding to the 16 antenna ports; and means for transmitting or receiving the DMRS between a network device and the network device based on the plurality of resources; the vector applied to the first subset of antenna ports is [1, 1, 1, 1] or [1, −1, 1, −1]; the vector applied to the second subset of antenna ports is [1,j,-1,-j] or [1,-j,-1,j], or the vector applied to the second subset of antenna ports is [1,1,-1,-1] or [1,-1,-1,1] Terminal device.

2. the vector applied to the antenna port with indexes {0, 2, 4, 6} is [1, 1, 1, 1], the vector applied to the antenna port with indexes {1, 3, 5, 7} is [1, -1, 1, -1], If the DMRS is for a physical uplink shared channel (PUSCH), the vector applied to the antenna port with indexes {8, 10, 12, 14} is [1, j, -1, -j], and the vector applied to the antenna port with indexes {9, 11, 13, 15} is [1, -j, -1, j]. If the DMRS is for a physical downlink shared channel (PDSCH), the vector applied to the antenna port with indexes {8, 10, 12, 14} is [1, 1, -1, -1], and the vector applied to the antenna port with indexes {9, 11, 13, 15} is [1, -1, -1, 1]. The terminal device according to claim 1 .

3. means for determining a number of resources for a sounding reference signal (SRS) having eight antenna ports with indexes {1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007} ​​based on eight comb offset values; and means for transmitting the SRS to the network device based on the plurality of resources. The terminal device according to claim 1 .

4. When the eight antenna ports include a first set of antenna ports and a second set of antenna ports, each of the first set of antenna ports and the second set of antenna ports includes four antenna ports, and a maximum cyclic shift number is 12, a comb offset value applied to the antenna ports of the first set is a first value, and a comb offset value applied to the antenna ports of the second set is a second value. The terminal device according to claim 3.

5. the eight antenna ports include a first set of antenna ports, a second set of antenna ports, a third set of antenna ports, and a fourth set of antenna ports, each of the first set of antenna ports and the second set of antenna ports including two antenna ports; When the maximum cyclic shift number is 6, the comb offset value applied to the first set of antenna ports is a first value, the comb offset value applied to the second set of antenna ports is a second value, the comb offset value applied to the third set of antenna ports is a third value, and the comb offset value applied to the fourth set of antenna ports is a fourth value. The terminal device according to claim 3.

6. means for determining a plurality of resources for a phase tracking reference signal (PTRS) based on a set of resource element offsets of a demodulation reference signal (DMRS) configuration type 2; the set of resource element offsets applied to a DMRS port with index 1012 is [6, 7, 0, 1]; the set of resource element offsets applied to a DMRS port with index 1013 is [7, 0, 1, 6]; the set of resource element offsets applied to a DMRS port with index 1014 is [8, 9, 2, 3]; the set of resource element offsets applied to a DMRS port with index 1015 is [9, 2, 3, 8]; the set of resource element offsets applied to a DMRS port with index 1016 is [10, 11, 4, 5]; The set of resource element offsets applied to the DMRS port with index 1017 is [11, 4, 5, 10]. The terminal device according to claim 1 .

7. A network device, means for determining a plurality of resources for a demodulation reference signal (DMRS) of a configuration type 1 having 16 antenna ports, including a first subset of antenna ports with indexes {0, 1, 2, 3, 4, 5, 6, 7} and a second subset of antenna ports with indexes {8, 9, 10, 11, 12, 13, 14, 15}, based on 16 vectors respectively corresponding to the 16 antenna ports; A terminal device and a means for performing transmission or reception of the DMRS based on the plurality of resources, the vector applied to the first subset of antenna ports is [1, 1, 1, 1] or [1, −1, 1, −1]; the vector applied to the second subset of antenna ports is [1,j,-1,-j] or [1,-j,-1,j], or the vector applied to the second subset of antenna ports is [1,1,-1,-1] or [1,-1,-1,1] Network device.

8. the vector applied to the antenna port with indexes {0, 2, 4, 6} is [1, 1, 1, 1], the vector applied to the antenna port with indexes {1, 3, 5, 7} is [1, -1, 1, -1], If the DMRS is for a physical uplink shared channel (PUSCH), the vector applied to the antenna port with indexes {8, 10, 12, 14} is [1, j, -1, -j], and the vector applied to the antenna port with indexes {9, 11, 13, 15} is [1, -j, -1, j]. If the DMRS is for a physical downlink shared channel (PDSCH), the vector applied to the antenna port with indexes {8, 10, 12, 14} is [1, 1, -1, -1], and the vector applied to the antenna port with indexes {9, 11, 13, 15} is [1, -1, -1, 1]. The network device according to claim 7.

9. means for determining a number of resources for a sounding reference signal (SRS) having eight antenna ports with indexes {1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007} ​​based on eight comb offset values; and means for receiving the SRS from the terminal device based on the plurality of resources; The network device according to claim 7.

10. When the eight antenna ports include a first set of antenna ports and a second set of antenna ports, each of the first set of antenna ports and the second set of antenna ports includes four antenna ports, and a maximum cyclic shift number is 12, a comb offset value applied to the antenna ports of the first set is a first value, and a comb offset value applied to the antenna ports of the second set is a second value.

10. The network device of claim 9.

11. the eight antenna ports include a first set of antenna ports, a second set of antenna ports, a third set of antenna ports, and a fourth set of antenna ports, each of the first set of antenna ports and the second set of antenna ports including two antenna ports; When the maximum cyclic shift number is 6, the comb offset value applied to the first set of antenna ports is a first value, the comb offset value applied to the second set of antenna ports is a second value, the comb offset value applied to the third set of antenna ports is a third value, and the comb offset value applied to the fourth set of antenna ports is a fourth value.

10. The network device of claim 9.

12. means for determining a plurality of resources for a phase tracking reference signal (PTRS) based on a set of resource element offsets of a demodulation reference signal (DMRS) configuration type 2; the set of resource element offsets applied to a DMRS port with index 1012 is [6, 7, 0, 1]; the set of resource element offsets applied to a DMRS port with index 1013 is [7, 0, 1, 6]; the set of resource element offsets applied to a DMRS port with index 1014 is [8, 9, 2, 3]; the set of resource element offsets applied to a DMRS port with index 1015 is [9, 2, 3, 8]; the set of resource element offsets applied to a DMRS port with index 1016 is [10, 11, 4, 5]; The set of resource element offsets applied to the DMRS port with index 1017 is [11, 4, 5, 10]. The network device according to claim 7.

13. A method performed by a terminal device, comprising: determining a plurality of resources for a demodulation reference signal (DMRS) of configuration type 1 having 16 antenna ports, including a first subset of antenna ports with indexes {0, 1, 2, 3, 4, 5, 6, 7} and a second subset of antenna ports with indexes {8, 9, 10, 11, 12, 13, 14, 15}, based on 16 vectors respectively corresponding to the 16 antenna ports; and performing transmission or reception of the DMRS between a network device and the network device based on the plurality of resources; the vector applied to the first subset of antenna ports is [1, 1, 1, 1] or [1, −1, 1, −1]; the vector applied to the second subset of antenna ports is [1,j,-1,-j] or [1,-j,-1,j], or the vector applied to the second subset of antenna ports is [1,1,-1,-1] or [1,-1,-1,1] method.

14. the vector applied to the antenna port with indexes {0, 2, 4, 6} is [1, 1, 1, 1], the vector applied to the antenna port with indexes {1, 3, 5, 7} is [1, -1, 1, -1], If the DMRS is for a physical uplink shared channel (PUSCH), the vector applied to the antenna port with indexes {8, 10, 12, 14} is [1, j, -1, -j], and the vector applied to the antenna port with indexes {9, 11, 13, 15} is [1, -j, -1, j]. If the DMRS is for a physical downlink shared channel (PDSCH), the vector applied to the antenna port with indexes {8, 10, 12, 14} is [1, 1, -1, -1], and the vector applied to the antenna port with indexes {9, 11, 13, 15} is [1, -1, -1, 1]. The method of claim 13.

15. 1. A method performed by a network device, comprising: determining a plurality of resources for a demodulation reference signal (DMRS) of configuration type 1 having 16 antenna ports, including a first subset of antenna ports with indexes {0, 1, 2, 3, 4, 5, 6, 7} and a second subset of antenna ports with indexes {8, 9, 10, 11, 12, 13, 14, 15}, based on 16 vectors respectively corresponding to the 16 antenna ports; and performing transmission or reception of the DMRS with a terminal device based on the plurality of resources; the vector applied to the first subset of antenna ports is [1, 1, 1, 1] or [1, −1, 1, −1]; the vector applied to the second subset of antenna ports is [1,j,-1,-j] or [1,-j,-1,j], or the vector applied to the second subset of antenna ports is [1,1,-1,-1] or [1,-1,-1,1] method.

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