Communication method and apparatus

Abstract

The present application provides a communication method and apparatus. The method comprises: acquiring first information, wherein the first information may be used for indicating the number and the time domain positions of additional demodulation reference signals (DMRSs); and sending the first information. In the present application, the number and / or the time domain positions of additional DMRSs can be flexibly indicated, thereby ensuring that the accuracy of channel estimation is improved in highly time-varying scenarios. Moreover, it can also be ensured that resource overhead caused by DMRSs is reduced in lowly time-varying scenarios, thereby improving communication efficiency.

Description

Communication method and apparatus

[0001] The present application claims priority from the Chinese patent application No. 202411367909.0 filed on September 27, 2024, and entitled "Communication method and apparatus", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the field of wireless communication, in particular to a communication method and apparatus. BACKGROUND

[0003] A demodulation reference signal (DMRS) is mainly used for channel estimation when demodulating a physical uplink shared channel (PUSCH) or a physical downlink shared channel (PDSCH). According to the symbol occupied by the DMRS, the DMRS can be divided into a front-loaded DMRS and an additional DMRS. For example, in a slot, the front-loaded DMRS is configured by default. The front-loaded DMRS can support one symbol or two symbols. According to the different starting symbols of the front-loaded DMRS, the front-loaded DMRS can be divided into type A and type B.

[0004] At present, the front-loaded DMRS with single symbol or double symbol can at most increase 3 groups of additional DMRSs for channel estimation. For a high time-varying channel, the front-loaded DMRS and the at most 3 groups of additional DMRSs cannot guarantee the accuracy of channel estimation. For a low time-varying channel, although the comb-shaped distribution of the DMRS in the frequency domain can guarantee the accuracy of channel estimation, it will also bring greater system overhead and reduce communication efficiency. SUMMARY

[0005] The present application provides a communication method and apparatus, which flexibly indicates the number and time domain position of additional demodulation reference signals (DMRSs), thereby guaranteeing the accuracy of channel estimation in a high time-varying scenario, and also guaranteeing the reduction of resource overhead caused by the DMRS in a low time-varying scenario, and improving communication efficiency.

[0006] To achieve the above object, the present application adopts the following technical solutions:

[0007] In a first aspect, a communication method is provided. The method can be applied to a network device or a component (e.g., a processor, a circuit, a chip, or a chip system, etc.) of the network device, and can also be a logic module or software that can implement all or part of the function of the network device. The method can include obtaining first information. The first information can be used to indicate the number and / or time domain location of additional DMRSs. The first information is transmitted.

[0008] The application can flexibly indicate the number and time domain location of additional DMRSs, thereby ensuring the accuracy of channel estimation in a high time-varying scenario. In addition, the application can also ensure that the resource overhead caused by DMRS is reduced in a low time-varying scenario, thereby improving the communication efficiency.

[0009] In a possible design, the method can further include determining the number of additional DMRSs according to a predefined rule. Alternatively, the number of additional DMRSs can be determined according to a first parameter and / or a second parameter. The first parameter can be used to indicate the relative movement between the terminal and the network device. The second parameter can be used to indicate the change of the channel between the terminal and the network device.

[0010] The application provides multiple configurations of additional DMRSs to adapt to different scenarios and improve the system versatility.

[0011] In a possible design, the number of additional DMRSs includes one or more of a first number, a second number, and a third number. The first number can be the number of DFT-s-OFDM symbols occupied by the additional DMRSs. The second number can be the number of additional DMRS groups corresponding to one DFT-s-OFDM symbol. The third number can be the number of modulation symbols occupied by the additional DMRSs in one additional DMRS group.

[0012] The application can more flexibly configure the DFT-s-OFDM symbols occupied by the additional DMRSs and the corresponding time domain resource locations. Therefore, the application can configure more reasonable additional DMRSs based on different communication scenarios, thereby improving the accuracy of channel estimation. In addition, the application can also avoid resource waste caused by excessive DMRSs.

[0013] In a possible design, the second number corresponding to different DFT-s-OFDM symbols occupied by the additional DMRSs is different, and / or the third number corresponding to different additional DMRS groups is different.

[0014] The application can configure additional DMRS more flexibly, and balance the accuracy of channel estimation and resource consumption.

[0015] In a possible design, the second quantity has a correlation with at least one of the following: the first parameter; the second parameter; or the first time domain position, where the first time domain position is a DFT-s-OFDM symbol position occupied by the additional DMRS in a slot.

[0016] The application provides various ways of configuring the second quantity, so as to accurately configure the second quantity in different scenarios by using appropriate ways, thereby guaranteeing the accuracy of channel estimation.

[0017] In a possible design, the third quantity has a correlation with at least one of the following: the first parameter; the second parameter; or the second quantity.

[0018] The application provides various ways of configuring the third quantity, so as to accurately configure the third quantity in different scenarios by using appropriate ways, thereby guaranteeing the accuracy of channel estimation.

[0019] In a possible design, the time domain position of the additional DMRS can include a first time domain position and a second time domain position. The first time domain position can be a DFT-s-OFDM symbol position occupied by the additional DMRS in a slot. The second time domain position can be a time domain position of a modulation symbol occupied by the additional DMRS in the DFT-s-OFDM symbol corresponding to the first time domain position.

[0020] The application can accurately indicate the time domain position corresponding to the additional DMRS, so that the terminal can determine the additional DMRS based on the position information subsequently, and improve the accuracy of channel estimation.

[0021] In a possible design, the method can further include: determining the first time domain position and the second time domain position according to a predefined rule. And / or, determining the first time domain position according to a first time duration. The first time duration can be related to a time domain resource for scheduling a physical downlink shared channel (PDSCH) in a slot.

[0022] The application provides various ways of determining the time domain position of the additional DMRS, so as to accurately configure the time domain position of the additional DMRS in different scenarios by using appropriate ways, thereby improving the system universality.

[0023] In a possible design, the method can further include: determining whether the additional DMRS needs to be configured. In the case that the additional DMRS needs to be configured, the first information is determined.

[0024] The application can also dynamically determine whether to configure the additional DMRS to adapt to different communication scenarios and improve universality.

[0025] In a possible design, determining whether to configure the additional DMRS includes: determining, according to a predefined rule, whether to configure the additional DMRS. Alternatively, a first signal from the terminal is detected, and a first parameter or a second parameter is determined according to a measurement result of the first signal. Whether to configure the additional DMRS is determined according to the first parameter or the second parameter.

[0026] The application provides various methods for determining whether to configure the additional DMRS, to more reasonably determine whether to configure the additional DMRS in different communication scenarios.

[0027] In a possible design, the first information is carried by any of the following: downlink control information (DCI); radio resource control (RRC) signaling; medium access control-control element (MAC-CE); a system message; or a PDSCH.

[0028] The application provides various carrying manners of the first information, to adapt to different communication scenarios and configure the first information in a more appropriate manner, thereby improving universality of the system.

[0029] In a possible design, the method can further include: transmitting a single-carrier signal containing the additional DMRS.

[0030] The application transmits the single-carrier signal containing the additional DMRS, thereby improving accuracy of channel estimation.

[0031] In a second aspect, a communication method is provided, which can be applied to a terminal or a component (for example, a processor, a circuit, a chip, or a chip system) of the terminal, and can also be a logic module or software capable of implementing all or part of the terminal functions. The method can include: receiving first information. The first information can be used to indicate a quantity and / or a time domain position of an additional DMRS.

[0032] In a possible design, the quantity of the additional DMRS can be determined according to a predefined rule. Alternatively, the quantity of the additional DMRS can be determined according to a first parameter and / or a second parameter. The first parameter can be used to indicate a relative movement condition between the terminal and the network device. The second parameter can be used to indicate a change condition of a channel between the terminal and the network device.

[0033] In a possible design, the number of additional DMRSs can include one or more of a first number, a second number, and a third number. The first number can be a number of DFT-s-OFDM symbols occupied by the additional DMRSs. The second number can be a number of additional DMRS groups corresponding to one DFT-s-OFDM symbol. The third number can be a number of modulation symbols occupied by the additional DMRSs in one additional DMRS group.

[0034] In a possible design, the second number corresponding to different DFT-s-OFDM symbols occupied by the additional DMRSs can be different, and / or the third number corresponding to different additional DMRS groups can be different.

[0035] In a possible design, the second number can have a correlation with at least one of the following: the first parameter; the second parameter; or, a first time-domain location. The first time-domain location can be a DFT-s-OFDM symbol location occupied by the additional DMRSs in one slot.

[0036] In a possible design, the third number can have a correlation with at least one of the following: the first parameter; the second parameter; or, the second number.

[0037] In a possible design, the time-domain location of the additional DMRSs can include a first time-domain location and a second time-domain location. The first time-domain location can be a DFT-s-OFDM symbol location occupied by the additional DMRSs in one slot. The second time-domain location can be a time-domain location of a modulation symbol occupied by the additional DMRSs in the DFT-s-OFDM symbol corresponding to the first time-domain location.

[0038] In a possible design, the first time-domain location and the second time-domain location can be determined according to a predefined rule. The first time-domain location can be determined according to a first time duration. The first time duration can be related to a time-domain resource for scheduling a PDSCH in one slot.

[0039] In a possible design, the method can further include: transmitting a first signal. The first signal can be used for the network device to determine the first parameter or the second parameter.

[0040] In a possible design, the first information can be carried by any of the following: DCI; RRC signaling; MAC-CE; a system message; or, a PDSCH.

[0041] In a possible design, a single-carrier signal containing additional DMRSs is received.

[0042] In a third aspect, a communication apparatus is provided. The communication apparatus can be a network device, or a communication module in a network device that implements the corresponding functions of the network device, or a chip in a network device that is responsible for the communication functions, such as a modem chip (also known as a baseband chip) or a system on chip (SoC) or a system in package (SIP) chip that contains a modem module. The communication apparatus can also be a logic module or software that can implement all or part of the functions of the network device. The communication apparatus can include a processing unit configured to obtain first information. The first information can be used to indicate the number and / or time domain position of the additional DMRS. The communication apparatus can also include a transceiver configured to transmit the first information.

[0043] In a possible design, the apparatus further includes a processing unit configured to determine the number of additional DMRSs according to a predefined rule. Alternatively, the processing unit is configured to determine the number of additional DMRSs according to the first parameter and / or the second parameter. The first parameter can be used to indicate the relative movement between the terminal and the network device. The second parameter can be used to indicate the change of the channel between the terminal and the network device.

[0044] In a possible design, the number of additional DMRSs can include one or more of a first number, a second number, and a third number. The first number can be the number of DFT-s-OFDM symbols occupied by the additional DMRS. The second number can be the number of additional DMRS groups corresponding to one DFT-s-OFDM symbol. The third number can be the number of modulation symbols occupied by the additional DMRS in one additional DMRS group.

[0045] In a possible design, the second number corresponding to different DFT-s-OFDM symbols occupied by the additional DMRS is different, and / or the third number corresponding to different additional DMRS groups is different.

[0046] In a possible design, the second number has a correlation with at least one of the following parameters: the first parameter; the second parameter; or a first time domain position, where the first time domain position is the position of the DFT-s-OFDM symbol occupied by the additional DMRS in a slot.

[0047] In a possible design, the third number has a correlation with at least one of the following parameters: the first parameter; the second parameter; or the second number.

[0048] In a possible design, the time-domain position of the additional DMRS can include a first time-domain position and a second time-domain position. The first time-domain position can be a DFT-s-OFDM symbol position occupied by the additional DMRS in a slot. The second time-domain position can be a time-domain position of a modulation symbol occupied by the additional DMRS in a DFT-s-OFDM symbol corresponding to the first time-domain position.

[0049] In a possible design, the processing unit is further configured to: determine the first time-domain position and the second time-domain position according to a predefined rule. And / or, determine the first time-domain position according to a first time duration. The first time duration can be related to a time-domain resource for scheduling a PDSCH in a slot.

[0050] In a possible design, the processing unit is further configured to: determine whether the additional DMRS needs to be configured. In the case where the additional DMRS needs to be configured, determine the first information.

[0051] In a possible design, the processing unit is further configured to: determine whether the additional DMRS needs to be configured according to a predefined rule. Or, detect a first signal from the terminal, and determine the first parameter or the second parameter according to a measurement result of the first signal. Determine whether the additional DMRS needs to be configured according to the first parameter or the second parameter.

[0052] In a possible design, the first information is carried in any of the following manners: DCI; or, RRC signaling; or, MAC-CE; or, a system message; or, a PDSCH.

[0053] In a possible design, the transceiver is further configured to: send a single-carrier signal containing the additional DMRS.

[0054] In a fourth aspect, a communication apparatus is provided. The communication apparatus can be a terminal, or a communication module in the terminal that implements functions of the terminal, or a chip in the terminal that is responsible for communication functions, such as a modem chip (also referred to as a baseband chip) or a SoC or SIP chip that contains a modem module. The communication apparatus can also be a logic module or software that can implement all or part of the functions of the terminal. The communication apparatus can include a transceiver configured to receive first information. The first information can be used to indicate a quantity and / or a time-domain position of an additional DMRS.

[0055] In a possible design, the quantity of the additional DMRS can be determined according to a predefined rule. Or, the quantity of the additional DMRS can be determined according to the first parameter and / or the second parameter. The first parameter can be used to indicate a relative movement between the terminal and the network device. The second parameter can be used to indicate a change of a channel between the terminal and the network device.

[0056] In a possible design, the number of additional DMRSs can include one or more of a first number, a second number, and a third number. The first number can be a number of DFT-s-OFDM symbols occupied by the additional DMRSs. The second number can be a number of additional DMRS groups corresponding to one DFT-s-OFDM symbol. The third number can be a number of modulation symbols occupied by the additional DMRSs in one additional DMRS group.

[0057] In a possible design, the second number corresponding to different DFT-s-OFDM symbols occupied by the additional DMRSs is different, and / or the third number corresponding to different additional DMRS groups is different.

[0058] In a possible design, the second number can have a correlation relationship with at least one of the following parameters: the first parameter; the second parameter; or a first time domain location. The first time domain location can be a DFT-s-OFDM symbol location occupied by the additional DMRSs in one slot.

[0059] In a possible design, the third number can have a correlation relationship with at least one of the following parameters: the first parameter; the second parameter; or the second number.

[0060] In a possible design, the time domain location of the additional DMRSs can include a first time domain location and a second time domain location. The first time domain location can be a DFT-s-OFDM symbol location occupied by the additional DMRSs in one slot. The second time domain location can be a time domain location of a modulation symbol occupied by the additional DMRSs in the DFT-s-OFDM symbol corresponding to the first time domain location.

[0061] In a possible design, the first time domain location and the second time domain location can be determined according to a predefined rule. The first time domain location can be determined according to a first duration. The first duration can be related to a time domain resource for scheduling a PDSCH in one slot.

[0062] In a possible design, the transceiver is further configured to: transmit a first signal. The first signal can be used for the network device to determine the first parameter or the second parameter.

[0063] In a possible design, the first information can be carried by any of the following: DCI; RRC signaling; MAC-CE; a system message; or a PDSCH.

[0064] In a possible design, the transceiver is further configured to: receive a single-carrier signal containing the additional DMRSs.

[0065] In a fifth aspect, a communication apparatus is provided, which can be a network device, or a communication module in a network device that implements the corresponding functions of the network device, or a chip in a network device that is responsible for the communication functions, such as a modem chip (also known as a baseband chip) or a SoC or SIP chip that contains a modem module. It can also be a logic module or software that implements all or part of the functions of the network device. The communication apparatus can include a processor configured to cause the apparatus to perform the method in the first aspect and in each possible implementation of the first aspect by executing computer program (or computer executable instructions) stored in the memory and / or by a logic circuit.

[0066] In a possible implementation, the apparatus further includes a memory.

[0067] In a possible implementation, the processor and the memory are integrated together.

[0068] In another possible implementation, the memory is located outside the communication apparatus.

[0069] In a possible implementation, the communication apparatus further includes a communication interface configured to enable the communication apparatus to communicate with other devices, such as transmitting or receiving data and / or signals. Exemplarily, the communication interface can be a transceiver, a circuit, a bus, a module, or other types of communication interfaces.

[0070] In a sixth aspect, a communication apparatus is provided, which can be a terminal, or a communication module in a terminal that implements the corresponding functions of the terminal, or a chip in a terminal that is responsible for the communication functions, such as a modem chip (also known as a baseband chip) or a SoC or SIP chip that contains a modem module. It can also be a logic module or software that implements all or part of the functions of the terminal. The communication apparatus can include a processor configured to cause the apparatus to perform the method in the second aspect and in each possible implementation of the second aspect by executing computer program (or computer executable instructions) stored in the memory and / or by a logic circuit.

[0071] In a possible implementation, the apparatus further includes a memory.

[0072] In a possible implementation, the processor and the memory are integrated together.

[0073] In another possible implementation, the memory is located outside the communication apparatus.

[0074] In a possible implementation, the communication apparatus further includes a communication interface configured to enable the communication apparatus to communicate with other devices, such as transmitting or receiving data and / or signals. Exemplarily, the communication interface can be a transceiver, a circuit, a bus, a module, or other types of communication interfaces.

[0075] In a seventh aspect, a communication system is provided, the system comprising: a network device configured to perform the method in the first aspect and possible implementation of the first aspect, and a terminal configured to perform the method in the second aspect and possible implementation of the second aspect.

[0076] In an eighth aspect, a chip is provided, the chip comprising an interface circuit and one or more processors. The one or more processors are coupled with a memory. The memory is configured to store part or all of the computer program or instructions necessary to implement the functions of the above-mentioned first aspect and second aspect. The one or more processors can execute the computer program or instructions, when the computer program or instructions are executed, so that the communication device implements the method in any possible design or implementation of the above-mentioned first aspect and second aspect. The interface circuit is configured to implement the communication function within the communication device and / or the communication function of the communication device with other devices or components.

[0077] In a ninth aspect, a computer readable storage medium is provided. The computer readable storage medium stores computer instructions; when the computer instructions are run on a computer, the computer executes the communication method designed in any aspect described above.

[0078] In a tenth aspect, a computer program product is provided. The computer program product comprises computer program or instructions, when the computer program or instructions are run on a computer, the computer executes the communication method designed in any aspect described above.

[0079] The method in any of the above-mentioned second aspect to tenth aspect corresponds to the beneficial effects described in the method in the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0080] FIG. 1 is a schematic diagram of an architecture of a communication system to which embodiments of the present application are applied;

[0081] FIG. 2 is a schematic diagram of a pre-DMRS provided by an embodiment of the present application;

[0082] FIG. 3 is a schematic diagram of another pre-DMRS provided by an embodiment of the present application;

[0083] FIG. 4 is a schematic diagram of a constellation point provided by an embodiment of the present application;

[0084] FIG. 5 is a schematic diagram of another constellation point provided by an embodiment of the present application;

[0085] FIG. 6 is a schematic diagram of a wireless access network scenario provided by an embodiment of the present application;

[0086] FIG. 7 is a schematic diagram of a communication method according to an embodiment of the present application;

[0087] FIG. 8 is a schematic diagram of configuration of a number of additional DMRSs according to an embodiment of the present application;

[0088] FIG. 9 is a schematic diagram of configuration of a number of additional DMRSs according to another embodiment of the present application;

[0089] FIG. 10 is a schematic diagram of configuration of a number of additional DMRSs according to yet another embodiment of the present application;

[0090] FIG. 11 is a schematic diagram of another communication method according to an embodiment of the present application;

[0091] FIG. 12 is a schematic diagram of a communication apparatus according to an embodiment of the present application;

[0092] FIG. 13 is a schematic diagram of another communication apparatus according to an embodiment of the present application. DETAILED DESCRIPTION

[0093] FIG. 1 is a schematic diagram of an architecture of a communication system 1000 according to an embodiment of the present application. As shown in FIG. 1, the communication system 1000 includes a radio access network (RAN) 100, which includes at least one RAN node (e.g., 110a and 110b in FIG. 1, collectively referred to as 110), and at least one terminal (e.g., 120a-120j in FIG. 1, collectively referred to as 120). The RAN 100 can also include other RAN nodes, such as wireless relay devices and / or wireless backhaul devices (not shown in FIG. 1). The terminals 120 are connected to the RAN nodes 110 wirelessly. Terminals and terminals, and RAN nodes and RAN nodes, can be connected to each other through wired or wireless means. The communication system 1000 can also include a core network 200. The RAN nodes 110 are connected to the core network 200 wirelessly or through wired means. The core network devices in the core network 200 and the RAN nodes 110 in the RAN 100 can be independent and different physical devices, or can be the same physical device integrated with the logical functions of the core network devices and the logical functions of the RAN nodes. The communication system 1000 can also include the Internet 300.

[0094] The RAN 100 can be an evolved universal terrestrial radio access (E-UTRA) system, a new radio (NR) system, a future communication network, and a future wireless access system defined in the 3rd generation partnership project (3GPP). The RAN 100 can also include two or more different wireless access systems described above. The RAN 100 can also be an open RAN (O-RAN).

[0095] The RAN node, also referred to as a radio access network device, a RAN entity, or an access node, is used to help the terminal access the communication system through a wireless manner. In an application scenario, the RAN node can be a base station (BS), an evolved NodeB (eNodeB / eNB), a transmission reception point (TRP), a future base station (generation NodeB, gNB) in a 5th generation (5G) mobile communication system, a future base station in a future communication network, or a base station in a future mobile communication system. The RAN node can be a macro base station (such as 110a in FIG. 1), or a micro base station or an indoor station (such as 110b in FIG. 1), or a relay node, or a master node.

[0096] In another application scenario, wireless access can be realized for a terminal through cooperation of a plurality of RAN nodes, and different RAN nodes realize part of functions of a base station respectively. For example, a RAN node can be a central unit (CU), a distributed unit (DU), or a radio unit (RU). The RU can also be referred to as a radio frequency unit. The CU here completes functions of a radio resource control protocol and a packet data convergence protocol (PDCP) of a base station, and can also complete a function of a service data adaptation protocol (SDAP); the DU completes functions of a radio link control layer and a medium access control (MAC) layer of a base station, and can also complete a function of part of a physical layer or all of a physical layer. For specific descriptions of the above protocol layers, refer to related technical specifications of the 3GPP. The RU can be used to realize functions of transceiving radio frequency signals. The CU and the DU can be two independent RAN nodes, or can be integrated in the same RAN node, for example, integrated in a baseband unit (BBU). The RU can be included in a radio frequency device, for example, included in a remote radio unit (RRU) or an active antenna unit (AAU). The CU can be further divided into two types of RAN nodes of a CU-control plane and a CU-user plane.

[0097] In different systems, a RAN node can have different names. For example, in an open radio access network (O-RAN) system, a CU can be referred to as an open CU (O-CU), a DU can be referred to as an open DU (O-DU), and an RU can be referred to as an open RU (O-RU). The RAN node in the embodiments of the present application can be implemented through a software module, a hardware module, or a combination of a software module and a hardware module. For example, the RAN node can be a server loaded with a corresponding software module. The embodiments of the present application do not limit specific technologies and specific device forms adopted by the RAN node. In order to facilitate description, a base station is described as an example of the RAN node in the following.

[0098] A terminal is a device with wireless transceiving function, which can send signals to a base station or receive signals from a base station. A terminal can also be referred to as a terminal device, user equipment (UE), mobile station, mobile terminal, etc. A terminal can be widely applied to various scenarios, such as device-to-device (D2D), vehicle to everything (V2X) communication, machine-type communication (MTC), internet of things (IoT), virtual reality, augmented reality, industrial control, automatic driving, remote medical treatment, smart power grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. A terminal can be a mobile phone, tablet computer, computer with wireless transceiving function, wearable device, vehicle, airplane, ship, robot, mechanical arm, smart home device, etc. Embodiments of the present application do not limit specific technologies and specific device forms adopted by a terminal.

[0099] In some examples, the core network 200 can include an access and mobility management function (AMF) entity, a session management function (SMF) entity, a user plane function (UPF) entity, a sensing service control function (SSCF), a sensing data processing function (SDPF), a unified data management (UDM), etc.

[0100] A base station and a terminal can be fixed in position or movable. A base station and a terminal can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on water surface; can also be deployed on an airplane, balloon and artificial satellite. Embodiments of the present application do not limit application scenarios of a base station and a terminal.

[0101] The roles of the base station and the terminal can be relative. For example, the helicopter or the drone 120i in FIG. 1 can be configured as a mobile base station, and for the terminal 120j that accesses the wireless access network 100 through the 120i, the terminal 120i is a base station; but for the base station 110a, the 120i is a terminal, that is, the 110a and the 120i communicate through a wireless air interface protocol. Of course, the 110a and the 120i can also communicate through a base station-to-base station interface protocol, and in this case, the 120i is also a base station relative to the 110a. Therefore, the base station and the terminal can be collectively referred to as a communication device, and the 110a and the 110b in FIG. 1 can be referred to as a communication device with a base station function, and the 120a-120j in FIG. 1 can be referred to as a communication device with a terminal function.

[0102] The base station and the terminal, the base station and the base station, and the terminal and the terminal can communicate through a licensed frequency spectrum, or through an unlicensed frequency spectrum, or through both the licensed frequency spectrum and the unlicensed frequency spectrum; can communicate through a frequency spectrum below 6 gigahertz (GHz), or through a frequency spectrum above 6 GHz, or through both the frequency spectrum below 6 GHz and the frequency spectrum above 6 GHz. The embodiments of the present application do not limit the frequency spectrum resources used by wireless communication.

[0103] In the embodiments of the present application, the functions of the base station can also be performed by a module (such as a chip) in the base station, or by a control subsystem containing base station functions. The control subsystem containing base station functions herein can be a control center in the above-mentioned application scenarios such as smart grids, industrial control, intelligent transportation, and smart cities. The functions of the terminal can also be performed by a module (such as a chip or a modem) in the terminal, or by a device containing terminal functions.

[0104] The wireless communication system includes communication devices, and the communication devices can use air interface resources for wireless communication. The communication devices can include network devices and terminal devices, and the network devices can also be referred to as base station devices, that is, the wireless access network devices mentioned above. The air interface resources can include at least one of time domain resources, frequency domain resources, code resources, and space resources. The communication devices can also be referred to as communication devices.

[0105] The scheme provided by the embodiments of the present application can be applied to wireless communication between communication devices. The wireless communication can include wireless communication between network devices and terminals, wireless communication between network devices and network devices, and wireless communication between terminals and terminals. In the embodiments of the present application, the term "wireless communication" can also be referred to as "communication", and the term "communication" can also be described as "data transmission", "information transmission", or "transmission".

[0106] In the related art, DMRS can be used to estimate a channel, and according to the symbol occupied by the DMRS, the DMRS can be divided into front-loaded DMRS and additional DMRS. According to the different starting symbols, the front-loaded DMRS can be divided into type A and type B. For example, the starting symbol of the type A front-loaded DMRS can be located on the third symbol or the fourth symbol of the PUSCH or the PDSCH. The starting symbol of the type B front-loaded DMRS can be fixed as the first symbol of the PUSCH or the PDSCH. In some examples, if the front-loaded DMRS is 2 symbols, the 2 symbols are usually consecutive 2 symbols, and the time domain position of the second symbol is usually the time domain position indicated by type A or type B. The specific type A and type B DMRS configuration mode can be referred to the related art implementation, and the embodiments of the present application will not be repeated here.

[0107] The additional DMRS can support up to 3 groups of positions, such as position (pos) 1, position 2 and position 3. The number of symbols of each group of additional DMRS is the same as the number of symbols of the front-loaded DMRS. For example, if the front-loaded DMRS is 2 symbols, then each group of additional DMRS is also 2 symbols. In some examples, the least squares method (LS), minimum mean-square error (MMSE) and the like can be used to estimate the front-loaded DMRS, and the estimation result is used as the estimation result of the channel corresponding to other symbols. For example, the other symbols can be any symbol in a time slot except the front-loaded DMRS (or the front-loaded DMRS and the additional DMRS).

[0108] Referring to FIG. 2, in a time slot, taking type A front-loaded DMRS as an example, the case that the front-loaded DMRS is 1 symbol and the front-loaded DMRS is located at the third symbol position in a time slot is shown. For example, each column in FIG. 2 can be regarded as a symbol in the time domain, and 14 symbols correspond to a time slot. FIG. 3 is similar to FIG. 2, and the difference is that the time domain position of the front-loaded DMRS is the fourth symbol in a time slot.

[0109] In a terminal moving scenario, the channel is time-varying, and the faster the terminal moves, the faster the channel time-varying. Compared with the scenario where the terminal is stationary or moves at a low speed, the difference between the channels corresponding to different symbols in different moving speed scenarios will be greater. In this case, the channel estimated by the front-loaded DMRS is no longer suitable as the channel corresponding to other symbols. Because the difference between the channels is greater, the accuracy of the estimation result of the front-loaded DMRS as the channel estimation result of other symbols is lower. And the farther away from the symbol where the front-loaded DMRS is located, the lower the accuracy of the estimation result of the front-loaded DMRS. Taking single-symbol front-loaded DMRS as an example, assuming that the moving speed of the terminal is 30 kilometers per hour (km / h), reference is made to FIG. 4 for a constellation diagram estimated based on a symbol close to the front-loaded DMRS. Taking the front-loaded DMRS shown in FIG. 2 as an example, FIG. 4 can be considered as a constellation diagram estimated based on the fourth symbol. It can be seen that the constellation points in FIG. 4 have almost no amplitude change. FIG. 5 is similar to FIG. 4, except that it shows a symbol far away from the front-loaded DMRS. Still taking the front-loaded DMRS shown in FIG. 2 as an example, FIG. 5 can be considered as a constellation diagram estimated based on the last symbol. It can be seen that the constellation points in FIG. 5 have a large amplitude change, and a large offset compared with the constellation points in FIG. 4. For the horizontal and vertical axes in FIG. 4 and FIG. 5, one of the coordinate axes can correspond to the amplitude, and the other coordinate axis can correspond to the phase. Each point in FIG. 4 and FIG. 5 can correspond to a symbol. That is, FIG. 4 can be considered as a constellation diagram obtained by estimating based on a symbol close to the front-loaded DMRS, and demodulating the signal based on the estimation result. FIG. 5 is a constellation diagram obtained by estimating based on a symbol far away from the front-loaded DMRS, and demodulating the signal based on the estimation result.

[0110] In some technologies, if there are additional DMRSs, the channels corresponding to the DMRSs in different positions can be estimated respectively, and interpolation calculation is performed in a pre-set manner, such as averaging. The interpolation result is used as the estimated channel of other symbols, thereby reducing the performance loss caused by inaccurate estimation results in a moving scenario.

[0111] However, in a high moving speed scenario, the additional DMRSs at most three groups have very limited effect on improving the accuracy of channel estimation. That is, the accuracy of channel estimation cannot be guaranteed in this scenario. Moreover, the frequency domain resources occupied by the above-mentioned additional DMRSs often correspond to the front-loaded DMRS. For a scenario with a low moving speed, it will lead to high resource overhead and reduce communication efficiency.

[0112] Therefore, the embodiment of the present application provides a communication method, and the network device can flexibly indicate the number and time domain position of the additional DMRS. Therefore, the accuracy of channel estimation is improved in a high time-varying scenario, and the resource overhead caused by the DMRS can be reduced in a low time-varying scenario, and the communication efficiency is improved.

[0113] The communication method and device will be further described below with reference to the drawings. It can be understood that the terminal and the network device are taken as an example to illustrate the execution subject of the interaction in the embodiment of the present application, but the present application is not limited to the execution subject of the interaction. The method executed by the network device in the present application can also be implemented by a module (such as a circuit, a processor, a chip or a chip system, etc.) in the network device, or a logic node, a logic module or software capable of realizing all or part of the function of the network device. The method executed by the terminal in the present application can also be implemented by a module (such as a circuit, a processor, a chip or a chip system, etc.) in the terminal, or a logic node, a logic module or software capable of realizing all or part of the function of the terminal.

[0114] In the embodiment of the present application, the term "wireless communication" can also be referred to as "communication", and the term "communication" can also be described as "data transmission", "information transmission" or "transmission".

[0115] FIG. 6 is a schematic diagram of a wireless access network scenario provided by an embodiment of the present application.

[0116] The scenario can be a RAN scenario or an O-RAN scenario, the difference lies in that, for the O-RAN scenario, the CU is replaced by the O-CU, the DU is replaced by the O-DU, and the RU is replaced by the O-RU. Taking the RAN scenario as an example, the CU and the DU interact through a midhaul link, and the DU and the RU interact through a front haul link. In some scenarios, the access network device can also be divided into a baseband unit (BBU) and a remote radio unit (RRU). The BBU can be considered to include the functions of the CU and the DU, and the RRU can be considered to be the RU. The access network device can interact with a core network element through a backhaul link. The access network device interacts with at least one terminal through an air interface.

[0117] In some embodiments, the BBU and the RU can be co-located or not co-located, which is not limited in the embodiment of the present application.

[0118] In some embodiments, the DU and the RU can be co-located or not co-located. In some examples, the DU and the RU can cooperate to jointly implement the functions of the PHY layer. One CU can be connected with one or more DUs, and one DU can be connected with one or more RUs.

[0119] In some examples, the CU can include a CU control plane (CP) and a CU user plane (UP). As denoted as CU-CP and CU-UP. The CU-CP is configured to implement the control plane functions of the CU, and the CU-UP is configured to implement the user plane functions of the CU.

[0120] In different systems, the CU (or CU-CP and CU-UP), DU or RU can also have different names, but those skilled in the art can understand their meanings. For example, in the O-RAN system, the CU can also be referred to as O-CU, the DU can also be referred to as O-DU, the CU-CP can also be referred to as O-CU-CP, the CU-UP can also be referred to as O-CU-UP, and the RU can also be referred to as O-RU. The embodiments of the present application do not limit here.

[0121] For more specific implementation of CU, DU, RU and the like, please refer to the related technology, and the embodiments of the present application will not be repeated here.

[0122] FIG. 7 is a schematic diagram of a communication method provided by an embodiment of the present application.

[0123] The communication process can be applied to, but not limited to, the communication scenarios shown in FIG. 1 or FIG. 6. The method can be applied to LTE, LTE frequency division duplex (FDD) system, LTE TDD, 5G system or NR system, subsequent communication systems (such as future communication systems), V2X, etc., vehicle to network (V2N), vehicle to vehicle (V2V), vehicle to infrastructure (V2I), vehicle to pedestrian (V2P), etc., inter-vehicle communication long term evolution (LTE-V), Internet of Vehicles, MTC, IoT, inter-machine communication long term evolution (LTE-M), machine to machine (M2M), D2D, etc. In some embodiments, in the communication scenario shown in FIG. 1, the network device can include one or more. Multiple network devices can transmit data or control signaling with the same terminal. The method can include the following steps:

[0124] S101, the network device obtains first information.

[0125] In some examples, the first information can be used to indicate the number and / or time domain position of the additional DMRS. Unlike the related art, which determines the possible 3 groups of fixed positions of the additional DMRS based on the protocol, the network device in the embodiments of the present application can flexibly indicate the number and / or corresponding time domain position of the additional DMRS according to the actual situation.

[0126] In some examples, the first information can include additional DMRS quantity information, which can be used to indicate the number of additional DMRS. The network device can determine the number of additional DMRS. And according to the determined number of additional DMRS, the additional DMRS quantity information is obtained. And the additional DMRS quantity information is carried in the first information.

[0127] Optionally, the additional DMRS quantity information includes, but is not limited to, the specific value of the number of additional DMRS (such as the binary bit value corresponding to the specific value) or the mapping value corresponding to the specific value of the number of additional DMRS, etc.

[0128] For example, the network device can directly determine the number of additional DMRSs according to a predefined rule or protocol. For example, the predefined rule directly defines the number of additional DMRSs as 3 or 5, and the specific value can be adjusted according to actual conditions, which is not limited in the embodiments of the present application.

[0129] For another example, the network device can determine the number of additional DMRSs according to the first parameter and / or the second parameter. The first parameter can be used to indicate the relative movement between the terminal and the network device, and the second parameter can be used to indicate the change of the channel between the terminal and the network device. That is, the network device can determine the number of additional DMRSs according to the relative movement between the terminal and the network device, or determine the number of additional DMRSs according to the change of the channel between the terminal and the network device. Alternatively, the network device can jointly determine the number of additional DMRSs according to the relative movement between the terminal and the network device and the change of the channel between the terminal and the network device.

[0130] Optionally, the number of additional DMRSs corresponding to the relative movement between the terminal and the network device is preconfigured, and / or the number of additional DMRSs corresponding to the change of the channel between the terminal and the network device is preconfigured. The network device can determine the appropriate number of additional DMRSs according to the above correspondence and in combination with the current relative movement or the change of the channel.

[0131] For example, the relative movement between the terminal and the network device can be represented by the moving speed, and the number of additional DMRSs corresponding to different moving speeds can be preconfigured. For another example, the relative movement between the terminal and the network device can also be represented by the frequency offset, the angle of arrival (AOA) change rate, and the like, and the number of additional DMRSs corresponding to the above parameters can be preconfigured, which is not limited in the embodiments of the present application. It can be understood that the first parameter can be any parameter representing the moving speed.

[0132] For another example, the change of the channel between the terminal and the network device can be represented by the fading type, the fading speed, and the like. Correspondingly, the number of additional DMRSs corresponding to different parameters such as the fading type and the fading speed can be preconfigured. For example, the fading type can include fast fading and slow fading. Therefore, the second parameter can be any parameter representing the time-varying of the channel.

[0133] The embodiments of the present application provide various ways to configure the number of additional DMRSs, so as to be applicable to different scenarios and improve system universality. Meanwhile, the embodiments of the present application can flexibly configure a more appropriate number of additional DMRSs in combination with the relative movement between the terminal and the network device and / or the change of the channel between the terminal and the network device, so as to ensure the accuracy of channel estimation and avoid resource waste.

[0134] In some embodiments, the number of additional DMRSs involved in the present application can include one or more numbers. For example, the one or more numbers can include one or more of a first number, a second number and a third number. Therefore, the additional DMRS number information described above can also be used to indicate one or more of the first number, the second number and the third number. For example, the first number can be the number of additional DMRSs occupying a discrete fourier transform-spread-orthogonal frequency division multiplexing (DFT-s-OFDM) symbol. For example, the first number can be denoted as a. The second number can be the number of additional DMRS groups corresponding to one DFT-s-OFDM symbol. For example, the second number can be denoted as b. The third number can be the number of modulation symbols occupied by additional DMRSs in one additional DMRS group. For example, the third number can be denoted as c. For example, one time slot can include a plurality of DFT-s-OFDM symbols, such as 14 DFT-s-OFDM symbols. Each DFT-s-OFDM symbol can be composed of one or more modulation symbols. It is worth noting that in the present application, the "symbol" described separately can be considered as a "DFT-s-OFDM symbol".

[0135] Referring to FIG. 8, a possible configuration of additional DMRSs in one time slot is shown, taking a=2 as an example. Further, it is assumed that b=2, c=2. Referring to FIG. 9, it means that for each additional DMRS in FIG. 8, the modulation symbols in the DFT-s-OFDM symbol occupied by the additional DMRS can be divided into 2 additional DMRS groups, and 2 modulation symbols in each additional DMRS group are occupied as additional DMRSs. For example, it is assumed that b=3, c=2. Referring to FIG. 10, it means that for each additional DMRS in FIG. 8, the modulation symbols in the DFT-s-OFDM symbol occupied by the additional DMRS can be divided into 3 additional DMRS groups, and 2 modulation symbols in each additional DMRS group are occupied as additional DMRSs. Of course, FIGS. 8 to 10 only show one possible additional DMRS configuration, which is not limited in the embodiments of the present application.

[0136] In some examples, the network device can first determine the first number a according to a predefined rule, such as determining a equal to 2. Alternatively, the network device can determine the first number a according to a relative moving speed between the terminal and the network device, such as assuming the moving speed is 40 kn / h, which corresponds to a equal to 2. This means that the network device configures the additional DMRS to occupy 2 DFT-s-OFDM symbols in a time slot. Further, the network device can determine the second number b according to a predefined rule or the moving speed. For example, the predefined value of b is 3, or according to the moving speed of 40 kn / h, which corresponds to b equal to 3. This means that the DFT-s-OFDM symbols occupied by the additional DMRS can be divided into 3 additional DMRS groups. In some cases, 2 DFT-s-OFDM symbols are divided into 3 additional DMRS groups. In another case, the network device can configure the second number b corresponding to each DFT-s-OFDM symbol according to the different DFT-s-OFDM symbols occupied by the additional DMRS. For example, the first DFT-s-OFDM symbol occupied by the additional DMRS corresponds to b equal to 2, and the second DFT-s-OFDM symbol occupied by the additional DMRS corresponds to b equal to 3. Further, the network device can determine the third number c according to a predefined rule or the moving speed. For example, the predefined value of c is 2. Alternatively, for a certain value of b, the corresponding value of c is predefined. For example, when the value of b is 2, the value of c is 2; when the value of b is 3, the value of c is 4, and so on. Alternatively, the value of c can be determined according to the moving speed, such as the moving speed of 40 kn / h, which corresponds to c equal to 2. In this way, the network device completes the configuration of the number of additional DMRS. Of course, the above values are only an exemplary description, and the moving speed can be replaced by a moving speed range, a fading type, a fading speed, or any other possible first parameter and second parameter, which are not limited in the embodiments of the present application.

[0137] The embodiments of the present application can more flexibly configure the DFT-s-OFDM symbols occupied by the additional DMRS and the corresponding time domain resource positions. Therefore, the additional DMRS can be more reasonably configured based on different communication scenarios, and the accuracy of channel estimation can be improved. At the same time, resource waste caused by excessive DMRS can also be avoided.

[0138] In some embodiments, it is considered that the additional DMRSs can occupy different DFT-s-OFDM symbols. Then, one case is that for each of the DFT-s-OFDM symbols that the additional DMRSs can occupy, the second number and the third number corresponding to the DFT-s-OFDM symbol are the same. For example, referring to the additional DMRSs occupying 2 DFT-s-OFDM symbols as shown in FIG. 8. Then for the 2 DFT-s-OFDM symbols, the additional DMRSs can be configured in the manner as shown in FIG. 9, or the additional DMRSs can be configured in the manner as shown in FIG. 10.

[0139] Another case is that for the different DFT-s-OFDM symbols that the additional DMRSs occupy, the second number corresponding to each of the DFT-s-OFDM symbols is different. That is, for the different DFT-s-OFDM symbols that the additional DMRSs occupy, different second numbers can be configured separately. For example, for different additional DMRS groups, the corresponding third number can also be different. That is, for each of the additional DMRS groups in the second number, the number of modulation symbols occupied by the additional DMRSs in each additional DMRS group can also be different, that is, different third numbers are configured separately. For example, for each of the additional DMRS groups in different second numbers, the same third number can be used. For example, for each of the additional DMRS groups in the same second number, different third numbers can be used. For example, for each of the additional DMRS groups in different second numbers, different third numbers can be used.

[0140] Obviously, the above-mentioned second case can more flexibly configure the additional DMRS. For example, in a scene where the resource overhead or resource loss requirement is relatively strict, the additional DMRS can be more flexibly configured, such as configuring the DFT-s-OFDM symbol occupied by the additional DMRS closer to the front-end DMRS, fewer additional DMRS groups and / or fewer modulation symbols can be configured, thereby reducing the resource overhead.

[0141] In some embodiments, the time domain position indicated by the first information can include a first time domain position and a second time domain position. Accordingly, the first information can include first time domain position information and second time domain position information. For example, the first time domain position can be a DFT-s-OFDM symbol position occupied by the additional DMRS in a slot. Then, the first time domain position information is used to indicate the time domain positions of the DFT-s-OFDM symbols occupied in the first quantity. For another example, the second time domain position can be a time domain position of a modulation symbol occupied by the additional DMRS in the DFT-s-OFDM symbol corresponding to the first time domain position. Then, the second time domain position information can be used to indicate the time domain positions of the modulation symbols specifically occupied in the DFT-s-OFDM symbol occupied by the additional DMRS, i.e., the time domain positions of the modulation symbols in the third quantity. For example, the second time domain position can be a center position, a start position, or an end position in the additional DMRS group. For example, when the second time domain position is the center position in the additional DMRS group, it can be considered that the distance between the second time domain position and the start position of the additional DMRS group is the same as the distance between the second time domain position and the end position of the additional DMRS group. Alternatively, the second time domain position can be any possible time domain position in the additional DMRS group, which can be set according to actual conditions, and the embodiments of the present application do not limit this.

[0142] As shown in FIG. 8, the first time domain position can be a DFT-s-OFDM symbol position occupied by the additional DMRS in FIG. 8, i.e., a region corresponding to a black filled box in FIG. 8. As shown in FIG. 9 and FIG. 10, the second time domain position can be a modulation symbol position occupied by the additional DMRS in FIG. 9 or FIG. 10, i.e., a region corresponding to a black filled box and a white diagonal line in FIG. 9 or FIG. 10.

[0143] The embodiments of the present application can accurately indicate the time domain position corresponding to the additional DMRS, so that the terminal can determine the additional DMRS based on the position information subsequently, and improve the accuracy of channel estimation.

[0144] In some examples, the first time domain position and / or the second time domain position can be determined according to a predefined rule. In other examples, the first time domain position can be determined according to a first duration. The first duration is related to time domain resources used for scheduling PDSCH in a slot. For example, the first duration can be denoted as l_d. For example, for a slot, for a type A front-loaded DMRS, the l_d can be a duration between the first DFT-s-OFDM symbol and the last DFT-s-OFDM symbol used for scheduling PDSCH resources in the slot. Alternatively, the l_d can be a number of DFT-s-OFDM symbols between the first DFT-s-OFDM symbol and the last DFT-s-OFDM symbol used for scheduling PDSCH resources in the slot. For example, for a slot, for a type B front-loaded DMRS, the l_d can be a duration used for scheduling PDSCH resources in the slot, or alternatively, the l_d can be a number of DFT-s-OFDM symbols used for scheduling PDSCH in the slot.

[0145] The embodiments of the present application provide various ways of determining the time domain position of the additional DMRS, so as to accurately configure the time domain position of the additional DMRS in different scenarios, and improve the universality of the system.

[0146] In S102, the network device sends first information to the terminal. Accordingly, the terminal receives the first information from the network device.

[0147] In some examples, the number of additional DMRSs can be predefined in the protocol. Then, the time domain position of the additional DMRS can be indicated in the first information. Alternatively, the number of additional DMRSs can be predefined in the protocol. Then, the time domain position of the additional DMRS can be indicated in the first information. In other examples, the first information indicates the number and the time domain position of the additional DMRS.

[0148] In S103, the network device sends a single carrier signal containing the additional DMRS to the terminal. Accordingly, the terminal receives the single carrier signal containing the additional DMRS from the network device.

[0149] In some examples, the network device can add the additional DMRSs and perform resource mapping in the resource corresponding to the single carrier signal based on the number of the additional DMRSs involved in S101 and the time domain positions of the additional DMRSs. The network device transmits the single carrier signal containing the additional DMRSs. It can be understood that the remaining resources can be used to map other communication data, or not to map any data, or other reference signals can be mapped, which are not limited in the embodiments of the present application. Of course, the configuration mode of the front-loaded DMRS can refer to the related technical implementation, and the embodiments of the present application will not be repeated. Generally, the scenario containing the additional DMRS also includes the front-loaded DMRS.

[0150] The terminal can receive the single carrier signal containing the additional DMRSs transmitted by the network device. The terminal can complete channel estimation, equalization, layer inverse mapping, demodulation and other processes in the case of receiving the single carrier signal containing the additional DMRSs. For example, based on the mode defined in the protocol, the specific definition and implementation process can refer to the related technology, and the embodiments of the present application will not be repeated. For example, channel estimation can be divided into two steps, such as the first step can estimate the channel corresponding to each of the front-loaded DMRS and the additional DMRS respectively to obtain the channel estimation result corresponding to each of them. The second step can interpolate the multiple channel estimation results obtained above, and use the interpolation as the channel estimation result corresponding to each symbol. In some examples, the channel estimation method mentioned above can use any possible method such as LS, MMSE, and the embodiments of the present application are not limited.

[0151] In the embodiments of the present application, the number and time domain position of the additional DMRSs can be flexibly indicated, thereby ensuring the accuracy of channel estimation in the high time-varying scenario. And it can also ensure to reduce the resource overhead caused by DMRS in the low time-varying scenario and improve the communication efficiency.

[0152] It is worth noting that the pre-defined rules mentioned in each of the above embodiments define different parameters, such as defining the values of each parameter in the same rule, or defining the values of one or more parameters in different rules, which are not limited in the embodiments of the present application.

[0153] In the communication method provided by the embodiments of the present application, the second number involved in each of the above embodiments can have a correlation with at least one of the following parameters. For example, the network device can determine the second number according to at least one of the following parameters.

[0154] In some examples, the network device can determine the second quantity based on a first parameter. That is, the network device can determine the second quantity according to a relative movement between the terminal and the network device. For example, different moving speeds can correspond to different second quantity values, and then the network device can determine the corresponding second quantity according to the moving speed. The moving speed can be a relative moving speed between the terminal and the network device. For reference, see Table 1.

[0155] Table 1

[0156] Of course, Table 1 is only an exemplary description, and the specific values and corresponding relationships can be adjusted according to actual conditions, and the embodiments of the present application are not limited. In some examples, if the additional DMRS occupies multiple DFT-s-OFDM symbols, Table 1 can include multiple columns of different b, such as b1, b2, etc., for indicating the second quantity corresponding to different DFT-s-OFDM symbols occupied by the additional DMRS. Alternatively, different columns of b can respectively represent possible second quantities under the condition that the additional DMRS occupies different numbers of DFT-s-OFDM symbols. For example, one table represents the possible second quantity under the condition that the additional DMRS occupies 1 DFT-s-OFDM symbol, and another table represents the possible second quantity under the condition that the additional DMRS occupies 2 DFT-s-OFDM symbols.

[0157] In other examples, the network device can determine the second quantity based on a second parameter. That is, the network device can determine the second quantity according to a change of a channel between the terminal and the network device. For example, different fading types and / or fading speeds can correspond to different second quantity values, and then the network device can determine the corresponding second quantity according to the fading type and / or the fading speed. Similar to Table 1, the difference is that the moving speed in Table 1 is replaced by the fading type and / or the fading speed, and the embodiments of the present application will not be described again.

[0158] In yet other examples, the network device can determine the second quantity based on a first time domain position. For example, the network device can determine the second quantity according to a time domain position of the additional DMRS in a time slot. For reference, see Table 2.

[0159] Table 2

[0160] In Table 2, the first quantity is taken as 2 as an example, the additional DMRS occupies 2 DFT-s-OFDM symbols in a slot, the time domain position of the first additional DMRS is l1, and the time domain position of the second additional DMRS is l2. Then, the second quantity corresponding to the DFT-s-OFDM symbol occupied by the first additional DMRS can be b1. The second quantity corresponding to the DFT-s-OFDM symbol occupied by the second additional DMRS can be b2. Table 2 shows that different second quantities are respectively configured for different DFT-s-OFDM symbols occupied by different additional DMRSs. Of course, the DFT-s-OFDM symbols occupied by different additional DMRSs can correspond to the same second quantity, and then b1 and b2 in Table 2 can be replaced by one b to represent. It can be understood that Table 2 is only an exemplary description, and the specific values and corresponding relationships can be adjusted according to actual conditions, and the embodiments of the present application are not limited.

[0161] In some embodiments, the second quantity can also be determined in combination with any two of the above-mentioned first parameter, second parameter, and first time domain position, or in combination with the first parameter, second parameter, and first time domain position together. For example, the above-mentioned Table 1 and Table 2 are combined, and the embodiments of the present application will not be described again.

[0162] The embodiments of the present application provide a variety of ways to configure the second quantity, so as to accurately configure the second quantity in different scenarios by using appropriate ways, thereby ensuring the accuracy of channel estimation.

[0163] In the communication method provided by the embodiments of the present application, the third quantity related by each of the above embodiments can have an association relationship with at least one of the following parameters. For example, the network device can determine the third quantity based on at least one of the following parameters.

[0164] In some examples, the network device can determine the third quantity based on the first parameter. That is, the network device can determine the third quantity according to the relative movement between the terminal and the network device. For example, different moving speeds can correspond to different third quantity values, and then the network device can determine the corresponding third quantity according to the moving speed. Similar to Table 1, the difference is that b in Table 1 is replaced by c, and the specific description can be referred to the description of the corresponding embodiments of Table 1, and the embodiments of the present application will not be described again.

[0165] In some examples, the network device can determine the third quantity based on the second parameter. That is, the network device can determine the third quantity according to the change of the channel between the terminal and the network device. For example, different fading types and / or fading speeds can correspond to different third quantity values, and then the network device can determine the corresponding third quantity according to the fading type and / or the fading speed. Similar to Table 1, the difference is that the moving speed in Table 1 is replaced by the fading type and / or the fading speed, and b is replaced by c, and the embodiments of the present application will not be described again.

[0166] In yet other examples, the network device can determine the third quantity based on the second quantity. For example, different second quantities can correspond to different third quantities. Referring to Table 3 shown,

[0167] Table 3

[0168] Of course, Table 3 is only an exemplary description, and the specific values and corresponding relationships can be adjusted according to actual conditions, and the embodiments of the present application are not limited.

[0169] In some embodiments, the third quantity can also be determined in combination with any two of the above-mentioned first parameter, second parameter, second quantity, or in combination with the first parameter, second parameter and second quantity, and the embodiments of the present application will not be described again. Of course, for the case where the third quantity is determined based on the first parameter and / or the second parameter, one first parameter and / or second parameter can also be configured for different DFT-s-OFDM symbols occupied by the additional DMRS, and the corresponding relationship with c. Or, one first parameter and / or second parameter can be configured for different values of b, and the corresponding relationship with c. The specific combination can be made according to the actual situation, and the embodiments of the present application are not limited.

[0170] The embodiments of the present application provide a variety of ways to configure the third quantity, so as to accurately configure the third quantity in different scenarios by using appropriate ways, thereby ensuring the accuracy of channel estimation.

[0171] In some embodiments, the first parameter and the second parameter are considered when the network device configures the additional DMRS. The terminal can also send a reference signal to the network device, and the network device can measure the reference signal to obtain the first parameter and / or the second parameter. For example, the terminal can send a sounding reference signal (SRS) to the network device. The network device measures the SRS sent by the terminal to obtain the first parameter and / or the second parameter. For example, the network device can measure the reference signal received power (RSRP), the signal to noise ratio (SNR), the signal to interference plus noise ratio (SINR), the reference signal received quality (RSRQ), the received signal strength indication (RSSI), and the like of the SRS. The type of measurement result can be selected according to actual conditions, and the type of measurement result is not limited in the present application. The network device determines the first parameter and / or the second parameter based on the possible measurement results. For example, different measurement results can be directly indexed to different first parameters and / or second parameters. Alternatively, based on a specific operation method, the measurement result is used as a variable to obtain the corresponding first parameter and / or second parameter. The specific operation method is not limited in the embodiments of the present application.

[0172] In some other examples, the SRS can be replaced by other possible reference signals, such as reference signals dedicated to the network device to determine the first parameter and / or the second parameter. Alternatively, the network device can also directly measure the data signal, which is not limited in the embodiments of the present application.

[0173] In the communication method provided in the embodiments of the present application, it is considered that the additional DMRS can not be needed in some scenarios, and therefore the network device can flexibly select whether to configure the additional DMRS involved in the embodiments according to different situations. For example, the method can further include that the network device can determine whether the additional DMRS needs to be configured according to a predefined rule. For example, in some scenarios, the additional DMRS is configured by default. Alternatively, in some other scenarios, the additional DMRS is not configured by default.

[0174] For example, the network device can also detect the first signal from the terminal, such as detecting the SRS. The network device obtains the first parameter and / or the second parameter according to the measurement result of the first signal. Then, the network device determines whether the additional DMRS needs to be configured according to the first parameter and / or the second parameter. For the case that the network device determines that the additional DMRS needs to be configured, the above S101 and S102 can be performed. For example, different first parameters and / or second parameters can be pre-configured, and the relationship between the first parameters and / or the second parameters and whether the additional DMRS is configured can be set. For example, refer to Table 4.

[0175] Table 4

[0176] Of course, Table 4 is only an example, and the specific values and the corresponding relationship can be adjusted according to the actual situation, and the embodiments of the present application are not limited. Meanwhile, the moving speed can also be replaced by other possible first parameters and / or second parameters, and the embodiments of the present application are not limited.

[0177] For the case that the network device determines that the additional DMRS needs to be configured, the network device performs the above S101-S103, that is, the additional DMRS is configured, and the first information is sent. The specific process is described in the foregoing embodiments, and the embodiments of the present application will not be described again.

[0178] The embodiments of the present application can also dynamically determine whether the additional DMRS is configured, so as to more reasonably determine whether the additional DMRS is configured in different communication scenarios.

[0179] In the communication method provided by the embodiments of the present application, the first information sent by the network device can be carried in multiple ways and sent to the terminal. For example, the first information can be carried in the downlink control information (DCI). For example, the first information can be carried in the radio resource control (RRC) signaling. For example, the first information can be carried in the medium access control-control element (MAC-CE). For example, the first information can be carried in the system message, such as the system information block (SIB). For example, the first information can be carried in the PDSCH.

[0180] The embodiments of the present application provide multiple carrying modes of the first information, so as to be suitable for different communication scenarios, and more suitable ways are adopted to configure the first information, so as to improve the universality of the system.

[0181] Next, the above scheme will be described in combination with more specific embodiments.

[0182] FIG. 11 is a schematic diagram of another communication method provided by embodiments of the present application.

[0183] The communication process can be applied to, but is not limited to, the communication scenarios shown in FIG. 1 or FIG. 6. The method can be applied to LTE, LTE FDD system, LTE TDD, 5G system or NR system, subsequent evolution of communication system (such as future communication system), V2X which can include V2N, V2V, V2I, V2P, etc., LTE-V, vehicle networking, MTC, IoT, LTE-M, M2M, D2D, etc. wireless communication scenarios. The method can include the following steps:

[0184] S201, the terminal sends a first signal to the network device. Correspondingly, the network device receives the first signal from the terminal.

[0185] For example, the network device measures the first information, determines the channel state, and determines the first parameter and / or the second parameter.

[0186] In some examples, the first signal can be SRS. For example, the terminal continuously sends 2 SRSs, and the network device estimates the mobile speed related information (i.e. the first parameter) and / or the channel related information (i.e. the second parameter) through the channel state information corresponding to the two consecutive SRSs respectively. The mobile speed related information can be any parameter that can represent the speed of the mobile speed, such as the mobile speed, the frequency offset, the AOA change rate, etc. The channel related information can be any parameter that can represent the time-varying of the channel, such as the fading type (such as fast fading or slow fading), the fading speed, etc.

[0187] S202, the network device determines the first information.

[0188] For example, the network device configures the number and time domain position of the additional DMRS. Of course, in some cases, the network device can first determine whether the first information needs to be configured, i.e. whether the additional DMRS needs to be configured.

[0189] One way is that the network device directly determines whether the additional DMRS needs to be configured. For example, for different types of terminals, or for different communication scenarios, it is predetermined whether the additional DMRS needs to be configured.

[0190] Another way is that the network device can determine the corresponding relationship of whether to configure the additional DMRS according to the first parameter and / or the second parameter determined in S201. For example, according to the different mobile speed related information, whether to configure the additional DMRS can be determined based on the corresponding relationship shown in Table 4.

[0191] Further, the network device determines the number and time domain location of the additional DMRS when determining that the additional DMRS needs to be configured. For example, a first number a, a second number b and a third number c are determined. A can also be considered as the total number of DFT-s-OFDM symbols occupied by the additional DMRS, b can also be considered as the number of additional DMRS groups in a single DFT-s-OFDM symbol, and c can also be considered as the number of modulation symbols occupied in a single additional DMRS group. In some examples, the number of modulation symbols in a DFT-s-OFDM symbol can be related to the number of resource blocks (resource block, RB), such as the product of the number of RBs and the number of subcarriers in the RB, which can be determined according to related technologies, and will not be described here.

[0192] For the value of a, one way is to directly configure the number of a. For example, the value of a is directly specified in the predefined rule. Alternatively, the first number can be determined according to the first parameter and / or the second parameter. Referring to Table 5.

[0193] Table 5

[0194] Of course, Table 5 is only an exemplary description, and the specific value and the corresponding relationship can be adjusted according to the actual situation, and the embodiments of the present application are not limited. The moving speed can also be replaced by other possible first parameters and / or second parameters, and the embodiments of the present application are not limited.

[0195] For the value of b and c, one way is to directly configure the number of b and c. For example, the value of b and c is directly specified in the predefined rule. Another way can be to first directly configure the value of one of b and c, and then configure the relationship between the first parameter and / or the second parameter and the value of the other parameter of b and c. For example, b is first directly determined, and the corresponding relationship between c and the first parameter and / or the second parameter is shown in Table 6,

[0196] Table 6

[0197] In the table 6, different configurations, such as configuration 1 and configuration 2, can correspond to different values of b. If the values of c are the same for different additional DMRS groups, the values of c in the table 6 can be between x1 and y1, inclusive. If the values of c are configured separately for different additional DMRS groups, the corresponding values or value ranges can be configured separately for each additional DMRS group. The embodiments of the present application do not limit this. In some examples, the above moving speed is described by way of example of a range, and of course can be replaced by a reference value of a partial moving speed. Accordingly, between two speed reference values, one of the corresponding relationships can be attributed according to the situation, and the embodiments of the present application do not limit this. Of course, the table 6 is only an example description, and the specific values and corresponding relationships can be adjusted according to the actual situation, and the embodiments of the present application do not limit this.

[0198] In some embodiments, the values of b and c in the DFT-s-OFDM symbol occupied by each additional DMRS can also be configured independently.

[0199] For the determination of b, one way is to configure the relationship between a and b, as shown in Table 7,

[0200] Table 7

[0201] Of course, the table 7 is only an example description, and the specific values and corresponding relationships can be adjusted according to the actual situation, and the embodiments of the present application do not limit this.

[0202] Another way is to determine different b based on the first parameter and / or the second parameter, as shown in Table 1.

[0203] Another way is to determine different b based on the first time domain position, as shown in Table 2. The configuration principle can be that the farther the DFT-s-OFDM symbol is from the front DMRS, the lower the accuracy of channel estimation. Therefore, the additional DMRS configured farther from the front DMRS is more dispersed, that is, the value of b can be larger.

[0204] For the determination of c, one way is to determine based on the value of b, as shown in Table 3, to configure the corresponding relationship between b and c, and to determine the corresponding c based on the value of b. Alternatively, for different values of b, c can also be determined separately based on the first parameter and / or the second parameter. The specific configuration method can refer to Table 1, with the difference that b is replaced by c, and of course the moving speed in Table 1 can be replaced by any other possible first parameter and / or second parameter, and the embodiments of the present application do not limit this. The configuration principle can be that the faster the moving speed, the faster the fading, and accordingly the more additional DMRS, and c can be larger.

[0205] In some embodiments, the network device can also determine the first time domain position and the second time domain position. In one way, the network device directly determines the first time domain position and the second time domain position. For example, the first time domain position and the second time domain position are predefined according to a predefined rule. Alternatively, the first time domain position can be determined according to the first duration, for example, as shown in Table 8.

[0206] Table 8

[0207] wherein the additional DMRS position 1 can be a time domain position corresponding to a first additional DMRS, the additional DMRS position 2 can be a time domain position corresponding to a second additional DMRS, and so on.

[0208] S203, the network device sends the first information to the terminal. Correspondingly, the terminal receives the first information from the network device.

[0209] S204, the network device sends the single carrier signal containing the additional DMRS to the terminal. Correspondingly, the terminal receives the single carrier signal containing the additional DMRS from the network device.

[0210] The implementation process of S203 and S204 is similar to that of S101 and S102, which will not be repeated here.

[0211] The specific implementation process of S201 to S204 can refer to the description of the corresponding embodiments in S101-S102.

[0212] The embodiments of the present application solve the problems of inaccurate channel estimation and excessive overhead in the mobile scenario / high time-varying channel by flexibly configuring the number and time domain position of the additional DMRS. Meanwhile, the additional DMRS in the present application is more universal.

[0213] It can be understood that each of the above embodiments of the present application can be independently implemented, or can be combined with each other; there is no absolute affiliation between the embodiments, and they can be combined with each other under any conditions to obtain the corresponding effects.

[0214] It can be understood that, in order to realize the functions in the above embodiments, the network device includes the corresponding hardware structure and / or software module for executing each function. Those skilled in the art should easily realize that, in combination with the units and method steps of the examples described in the embodiments disclosed in the present application, the present application can be realized in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in hardware or computer software driven hardware depends on the specific application scenario and design constraints of the technical solution.

[0215] FIG. 12 and FIG. 13 are structural diagrams of possible communication devices provided by the embodiments of the present application. The communication devices can be used to implement the functions of the first network-side device or the second network-side device in the above-mentioned method embodiments, and thus can also achieve the beneficial effects possessed by the above-mentioned method embodiments. In the embodiments of the present application, the communication device can be the RAN node 110 shown in FIG. 1, wherein the RAN node can also be referred to as an access network device or a network device. The communication device can also be a module (such as a chip) applied to a network device.

[0216] In the embodiments of the present application, the device used to implement the functions of the network device can be the network device, or can be a device capable of supporting the network device to implement the functions, such as a chip system, which can be installed in the network device or used in combination with the network device.

[0217] In the embodiments of the present application, the chip system can be composed of a chip, or can include a chip and other discrete devices.

[0218] As shown in FIG. 12, the communication device 1200 includes a processing unit 1210 and a transceiver unit 1220. The communication device 1200 is used to implement the functions of the network device or the terminal in the above-mentioned method embodiments shown in FIG. 7 and FIG. 11.

[0219] When the communication device 1200 is used to implement the functions of the network device in the method embodiment shown in FIG. 7, the transceiver unit 1220 is configured to transmit the first information. The transceiver unit 1220 is also configured to transmit the single carrier signal containing the additional DMRS. In some embodiments, the processing unit 1210 can be configured to perform any processing operation that the network device can involve.

[0220] When the communication device 1200 is used to implement the functions of the terminal in the method embodiment shown in FIG. 7, the transceiver unit 1220 is configured to receive the first information. The transceiver unit 1220 is also configured to receive the single carrier signal containing the additional DMRS. In some embodiments, the processing unit 1210 can be configured to perform any processing operation that the terminal can involve.

[0221] For more detailed description of the processing unit 1210 and the transceiver unit 1220, reference can be made to the related description of the method embodiments shown in FIG. 7 and FIG. 11.

[0222] As shown in FIG. 13, the communication apparatus 1300 includes a processor 1310 and an interface circuit 1320. The processor 1310 and the interface circuit 1320 are coupled to each other. It can be understood that the interface circuit 1320 can be a transceiver or an input / output interface. Optionally, the communication apparatus 1300 can further include a memory 1330 for storing instructions executed by the processor 1310 or storing input data required by the processor 1310 to execute instructions or storing data generated after the processor 1310 executes instructions. Sometimes, the interface circuit 1320 can also be understood as a part of the processor 1310, and the communication apparatus 1300 includes the processor 1310.

[0223] When the communication apparatus 1300 is used to implement the method shown in FIG. 7 and FIG. 11, the processor 1310 is configured to implement the functions of the processing unit 1210, and the interface circuit 1320 is configured to implement the functions of the transceiver unit 1220.

[0224] When the communication apparatus is a chip applied to a network device, the network device chip implements the functions of the network device in the method embodiments. The network device chip receives information from a terminal, which can be understood as that the information is first received by other modules (such as a radio frequency module or an antenna) in the network device, and then transmitted to the network device chip by the modules. The network device chip transmits information to the terminal, which can be understood as that the information is transmitted to other modules (such as a radio frequency module or an antenna) in the terminal, and then transmitted to the terminal by the modules.

[0225] When the communication apparatus is a chip applied to a terminal, the terminal chip implements the functions of the terminal in the method embodiments. The terminal chip receives information from a network device, which can be understood as that the information is first received by other modules (such as a radio frequency module or an antenna) in the terminal, and then transmitted to the terminal chip by the modules. The terminal chip transmits information to the network device, which can be understood as that the information is transmitted to other modules (such as a radio frequency module or an antenna) in the network device, and then transmitted to the network device by the modules.

[0226] In the present application, the sending of information from entity A to entity B can be direct sending from A to B, or indirect sending from A to B via other entities. Similarly, the receiving of information from entity A by entity B can be direct receiving of the information sent by entity A, or indirect receiving of the information sent by entity A via other entities. The entities A and B can be RAN nodes or terminals, or modules within RAN nodes or terminals. The sending and receiving of information can be the information interaction between RAN nodes and terminals, e.g., the information interaction between base stations and terminals; the sending and receiving of information can also be the information interaction between two RAN nodes, e.g., the information interaction between a CU and a DU; the sending and receiving of information can also be the information interaction between different modules within one device, e.g., the information interaction between a terminal chip and other modules of the terminal, or the information interaction between a base station chip and other modules of the base station.

[0227] It can be understood that the processor in the embodiments of the present application can be one or a combination of a central processing unit (CPU), other general-purpose processors, a digital signal processor (DSP), a microprocessor unit (MPU), a microcontroller unit (MCU), a graphics processing unit (GPU), an application specific integrated circuit, a field programmable gate array (FPGA), an artificial intelligence processor (AI processor), or a neural processing unit (NPU); or the processor mentioned in the embodiments of the present application can be an application specific integrated circuit (ASIC) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component (or part) or any combination thereof. The general-purpose processor can be a microprocessor, or any conventional processor, etc.

[0228] The method steps in the embodiments of the present application can be implemented in hardware or in software instructions executable by a processor. The software instructions can be composed of corresponding software modules, which can be stored in a memory, such as a volatile memory and / or a non-volatile memory. The non-volatile memory can be a flash memory, a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), or an electrically EPROM (EEPROM). The volatile memory can be a cache, a random access memory (RAM). For example, the RAM can be used as an external cache. By way of example, and not limitation, the RAM includes the following various forms: a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate SDRAM (DDR SDRAM), an enhanced SDRAM (ESDRAM), a synchlink DRAM (SLDRAM), and a direct rambus RAM (DR RAM). The memory can also be a register, a hard disk, a mobile hard disk, a compact disc (CD) ROM, or any other form of storage medium well known in the art.

[0229] It should be noted that when the processor is a general processor, a DSP, an ASIC, other programmable logic device, discrete gate or transistor logic device, discrete hardware component, the memory (storage module) can be integrated in the processor. An exemplary storage medium is coupled to the processor, so that the processor can read information from the storage medium and write information to the storage medium. The storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a base station or a terminal. The processor and the storage medium can also exist as separate components in the base station or the terminal.

[0230] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer programs or instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments are performed. The computer can be a general purpose computer, a special purpose computer, a computer network, a network device, a user equipment or other programmable apparatus. The computer programs or instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer programs or instructions can be transferred from one website site, computer, server or data center to another website site, computer, server or data center through wired or wireless manner. The computer readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center and the like integrated with one or more available media. The available media can be a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape; or an optical medium, such as a digital video disc; or a semiconductor medium, such as a solid state disk. The computer readable storage medium can be a volatile or non-volatile storage medium, or can include both volatile and non-volatile storage media.

[0231] In various embodiments of the present application, the terms and / or descriptions of different embodiments are consistent and can be referred to each other if there is no special description and logical conflict, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0232] In the present application, "at least one" means one or more, and "multiple" means two or more. "And / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the following cases: A exists alone, A and B exist together, B exists alone, where A and B can be singular or plural. In the literal description of the present application, the character " / ", generally represents that the front and rear associated objects are in an "or" relationship; in the formula of the present application, the character " / ", represents that the front and rear associated objects are in a "division" relationship. "Including at least one of A, B and C" can mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

[0233] It can be understood that various numerical numbers involved in the embodiments of the present application are only distinguished for convenience of description, and are not used to limit the scope of the embodiments of the present application. The size of the serial number of the above processes does not mean the execution order, and the execution order of the processes should be determined according to its function and inherent logic.

[0234] The network architecture and service scenarios described in the embodiments of the present application are used to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Those skilled in the art can know that, with the evolution of network architecture and the appearance of new service scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0235] The terms "first" and "second" and the like in the specification and drawings of the embodiments of the present application are used to distinguish different objects or different processing of the same object. The terms "first", "second" and the like can be used to distinguish the same items or similar items with basically the same function and role. For example, the first device and the second device are only used to distinguish different devices, and do not limit the sequence. Those skilled in the art can understand that the terms "first", "second" and the like do not limit the quantity and execution sequence, and the terms "first", "second" and the like do not necessarily mean different.

[0236] In addition, the terms "include" and "have" and any variations thereof mentioned in the description of the embodiments of the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include other steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device.

[0237] In the embodiments of the present application, the words "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design presented as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of the term "exemplary" or "for example" is intended to present concepts in a concrete manner. It is to be understood that the embodiments described in the specification are merely exemplary and non-limiting.

[0238] It can be understood that the "embodiments" mentioned throughout the specification mean that the specific features, structures or characteristics related to the embodiments are included in at least one embodiment of the embodiments of the present application. Therefore, the various embodiments throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in any suitable manner in one or more embodiments. It can be understood that in various embodiments of the embodiments of the present application, the size of the sequence number of each process does not mean the execution order, and the execution order of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0239] It can be understood that, in the embodiments of the present application, "… time" and "if" all refer to making corresponding processing under certain objective conditions, and are not limited to time, and do not require judgment actions when implementing, nor mean that there are other limitations.

[0240] It can be understood that, in some optional features in the embodiments of the present application, in some scenarios, they can be implemented independently without relying on other features, such as the scheme currently based on, to solve the corresponding technical problems and achieve the corresponding effects, and in some scenarios, they can be combined with other features according to the needs. Correspondingly, the devices given in the embodiments of the present application can also implement these features or functions, which will not be described here.

[0241] In the embodiments of the present application, the same or similar parts of different embodiments can be mutually referred to, unless otherwise specified. In the embodiments of the present application, and in each implementation method / implementation method / implementation method of each embodiment, if there is no special specification and logical conflict, the terms and / or descriptions of different embodiments, and each implementation method / implementation method / implementation method in each embodiment are consistent and can be mutually referred to, and the technical features of different embodiments, and each implementation method / implementation method / implementation method in each embodiment can be combined to form new embodiments, implementation methods, implementation methods, or implementation methods according to their inherent logical relationship. The implementation methods of the embodiments of the present application described below do not constitute a limitation on the protection scope of the embodiments of the present application.

Claims

1. A communication method characterized by comprising: The method comprises: obtaining first information, the first information being used for indicating a number and / or a time domain position of additional demodulation reference signals (DMRSs); sending the first information.

2. The method of claim 1, wherein, The method further comprises: determining the number of the additional DMRSs according to a predefined rule; or determining the number of the additional DMRSs according to a first parameter and / or a second parameter, wherein the first parameter is used for indicating a relative movement condition between a terminal and a network device, and the second parameter is used for indicating a variation condition of a channel between the terminal and the network device.

3. The method according to claim 1 or 2, characterized in that, The number of the additional DMRSs comprises one or more of a first number, a second number and a third number; wherein the first number is a number of discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-s-OFDM) symbols occupied by the additional DMRSs, the second number is a number of additional DMRS groups corresponding to one DFT-s-OFDM symbol, and the third number is a number of modulation symbols occupied by the additional DMRSs in one of the additional DMRS groups.

4. The method of claim 3, wherein, The second number corresponding to different DFT-s-OFDM symbols occupied by the additional DMRSs is different, and / or the third number corresponding to different additional DMRS groups is different.

5. The method according to claim 3 or 4, characterized in that, The second number has a correlation with at least one of the following parameters: the first parameter; the second parameter; or a first time domain position, wherein the first time domain position is a DFT-s-OFDM symbol position occupied by the additional DMRSs in one time slot.

6. The method according to claim 3 or 4, characterized in that, The third number has a correlation with at least one of the following parameters: the first parameter; the second parameter; or the second number.

7. The method according to any one of claims 1 to 6, characterized in that, The time domain position comprises a first time domain position and a second time domain position; wherein the first time domain position is a DFT-s-OFDM symbol position occupied by the additional DMRSs in one time slot, and the second time domain position is a time domain position of a modulation symbol occupied by the additional DMRSs in a DFT-s-OFDM symbol corresponding to the first time domain position.

8. The method of claim 7, wherein, The method further comprises: determining the first time domain position and the second time domain position according to a predefined rule; and / or determining the first time domain position according to a first duration, wherein the first duration is related to a time domain resource for scheduling a physical downlink shared channel (PDSCH) in one time slot.

9. The method according to any one of claims 1 to 8, characterized in that, The method further comprises: determining whether the additional DMRSs need to be configured; in a case where the additional DMRSs need to be configured, determining the first information.

10. The method of claim 9, wherein, The determination of whether the additional DMRSs need to be configured comprises: determining whether the additional DMRSs need to be configured according to a predefined rule; or detecting a first signal from a terminal, determining a first parameter or a second parameter according to a measurement result of the first signal, wherein the first parameter is used for indicating a relative movement condition between the terminal and a network device, and the second parameter is used for indicating a variation condition of a channel between the terminal and the network device; and determining whether the additional DMRSs need to be configured according to the first parameter or the second parameter.

11. The method according to any one of claims 1-10, characterized in that, The first information is carried by any one of the following ways: Downlink control information, DCI; or Radio resource control, RRC, signaling; or Medium access control-control element, MAC-CE; or System information; or PDSCH.

12. The method according to any one of claims 1-11, characterized in that, The method further includes: transmitting a single carrier signal containing the additional DMRS.

13. A method of communication, comprising: The method includes: receiving first information, the first information being used to indicate a number and / or time domain position of additional demodulation reference signals, DMRSs.

14. The method of claim 13, wherein, The number of the additional DMRSs is determined according to a predefined rule, or the number of the additional DMRSs is determined according to a first parameter and / or a second parameter, wherein the first parameter is used to indicate a relative movement condition between the terminal and the network device, and the second parameter is used to indicate a variation condition of a channel between the terminal and the network device.

15. The method according to claim 13 or 14, characterized in that, The number of the additional DMRSs includes one or more of a first number, a second number and a third number; The first number is a number of discrete Fourier transform-spread-orthogonal frequency division multiplexing, DFT-s-OFDM, symbols occupied by the additional DMRSs, the second number is a number of additional DMRS groupings corresponding to one DFT-s-OFDM symbol, and the third number is a number of modulation symbols occupied by the additional DMRSs in one of the additional DMRS groupings.

16. The method of claim 15, wherein, The second number corresponding to different DFT-s-OFDM symbols occupied by the additional DMRSs is different, and / or the third number corresponding to different additional DMRS groupings is different.

17. The method according to claim 15 or 16, characterized in that, The second number has a correlation with at least one of the following parameters: The first parameter; The second parameter; or A first time domain position, wherein the first time domain position is a DFT-s-OFDM symbol position occupied by the additional DMRSs in one slot.

18. The method of claim 15 or 16, wherein, The third number has a correlation with at least one of the following parameters: The first parameter; The second parameter; or The second number.

19. The method according to any of claims 13-18, characterized by, The time domain position includes a first time domain position and a second time domain position; wherein the first time domain position is a DFT-s-OFDM symbol position occupied by the additional DMRSs in one slot, and the second time domain position is a time domain position of a modulation symbol occupied by the additional DMRSs in a DFT-s-OFDM symbol corresponding to the first time domain position.

20. The method of claim 19, wherein, The first time domain position and the second time domain position are determined according to a predefined rule; and / or, the first time domain position is determined according to a first duration, wherein the first duration is related to a time domain resource for scheduling a physical downlink shared channel, PDSCH, in one slot.

21. The method of any of claims 13-20, wherein, The method further includes: transmitting a first signal, the first signal being used for the network device to determine the first parameter or the second parameter, wherein the first parameter is used to indicate a relative movement condition between the terminal and the network device, and the second parameter is used to indicate a variation condition of a channel between the terminal and the network device.

22. The method of any of claims 13-21, wherein, The first information is carried by any one of the following: Downlink control information, DCI; or Radio resource control, RRC, signaling; or Medium access control-control element, MAC-CE; or System information; or PDSCH.

23. The method of any of claims 13-22, wherein, The method further includes: receiving a single carrier signal containing the additional DMRS.

24. A communications device, characterized by A module for performing the method of any of claims 1-23.

25. A communications device, characterized by A processor and interface circuitry for receiving signals from and transmitting signals to other communication apparatuses, the processor being for implementing the method of any of claims 1-23 by logic circuitry and / or executing software code instructions.

26. A computer readable storage medium, characterized in that, A storage medium having stored computer programs or instructions which, when executed by a communication apparatus, implement the method of any of claims 1-23.

27. A computer program product comprising computer programs or instructions, characterized in that, A computer program or instructions which, when executed by a communication apparatus, implement the method of any of claims 1-23.

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