Method for acquiring configuration information of modulation and demodulation reference signal, configuration method and device

Abstract

The embodiments of the present application disclose a configuration method of a modulation and demodulation reference signal, a configuration information acquisition method, an apparatus, and a medium. A terminal device receives a first signaling, which includes a DMRS pattern configured for N time units, the DMRS pattern is used to indicate the number of DMRS in each time unit, the number of DMRS in each time unit is the total number of time domain symbols occupied by the DMRS in each time unit, the total number of time domain symbols occupied by the DMRS configured in at least two of the N time units is different, and N is a positive integer greater than 1. The terminal device receives or sends data in N time units based on the total number of time domain symbols occupied by the DMRS in each time unit and scheduling information. The method can flexibly configure the total number of time domain symbols occupied by the DMRS in each time unit, thereby reducing the DMRS pilot overhead.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a method for configuring a modulation and demodulation reference signal, and a method, device and medium for acquiring configuration information of a demodulation reference signal. Background Art

[0002] In the 5G wireless access technology New Radio (NR) system, downlink data is carried on the downlink physical shared channel (PDSCH), and uplink data is carried on the uplink physical shared channel (PUSCH). The transmitted data reaches the receiving end after experiencing a wireless fading channel. In order to correctly demodulate the transmitted data from the received signal, the receiving end needs to accurately know the fading experienced by the wireless channel. Therefore, when the 5G NR system transmits data in each transmission time interval (TTI), a modulation and demodulation reference signal (DMRS) as a pilot is inserted on the same bandwidth as the PDSCH or PUSCH. The receiving end performs channel estimation through the received DMRS that has experienced a wireless fading channel and correctly demodulates the transmitted data.

[0003] The network device configures the DMRS pattern (DMRSPattern) through Radio Resource Control (RRC), and then the network device carries the RRC signaling including the DMRS pattern on the PDSCH to send it to the terminal device. The total number of time domain symbols occupied by DMRS in each TTI indicated by the DMRS pattern is the same. The terminal device sends or receives DMRS with the same number of time domain symbols in each TTI according to the DMRS pattern included in the RRC signaling. This method has a large reference signal overhead. Summary of the invention

[0004] The present application provides a method for configuring a modulation and demodulation reference signal, a method, an apparatus and a medium for acquiring configuration information of a demodulation reference signal, which can reduce DMRS pilot overhead.

[0005] In a first aspect, an embodiment of the present application discloses a method for acquiring configuration information of a DMRS. The method comprises: receiving a first signaling, wherein the first signaling comprises a DMRS pattern configured for N time units, the DMRS pattern is used to indicate the number of DMRSs in each time unit, the number of DMRSs in each time unit is the total number of time domain symbols occupied by the DMRSs in each time unit, the total number of time domain symbols occupied by the DMRSs configured in at least two of the N time units is different, and N is a positive integer greater than 1. Then, based on the total number of time domain symbols occupied by the DMRSs in each time unit, data is received or sent in the N time units.

[0006] The method of this embodiment can be executed by a terminal device or by a chip in the terminal device. If it is executed by a chip, the chip can be a baseband processing chip, or it can be a baseband processing chip and a radio frequency unit. In this case, the act of receiving a signal can be understood as the act of a baseband processing chip (such as a baseband processor) in the terminal device demodulating a signal, or the act of inputting a signal into a baseband processing chip. Or the radio frequency unit outputs a signal to the baseband processing chip, and the baseband processing chip demodulates the input signal to obtain data or configuration information. Correspondingly, the act of sending a signal can be understood as the baseband processing chip generating an output signal, or the baseband processing chip outputting a signal to the radio frequency unit.

[0007] Correspondingly, in a second aspect, an embodiment of the present application discloses a DMRS configuration method, in which a first signaling is sent to a terminal device, wherein the first signaling includes a DMRS pattern configured for N time units, the DMRS pattern is used to indicate the number of DMRS in each time unit, the number of DMRS in each time unit is the total number of time domain symbols occupied by the DMRS in each time unit, the total number of time domain symbols occupied by the DMRS configured in at least two of the N time units is different, and N is a positive integer greater than 1. Then, based on the total number of time domain symbols occupied by the DMRS in each time unit, data is received or sent in the N time units.

[0008] The method of this embodiment can be executed by a network device (such as a base station) or by a chip in the network device. If it is executed by a chip in the network device, the chip can be a baseband processing chip, or it can be a baseband processing chip and a radio frequency unit. In this case, the act of receiving a signal can be understood as the act of a baseband processing chip (such as a baseband processor) in the network device demodulating a signal, or the act of inputting a signal into a baseband processing chip. Or the radio frequency unit outputs a signal to the baseband processing chip, and the baseband processing chip demodulates the input signal to obtain data or configuration information. Correspondingly, the act of sending a signal can be understood as the baseband processing chip generating an output signal, or the baseband processing chip outputting a signal to the radio frequency unit.

[0009] In the method, since the total number of time domain symbols occupied by the DMRS configured in at least two of the N time units is different, the total number of time domain symbols occupied by the DMRS in each time unit can be flexibly configured. In addition, based on the DMRS pattern configured for the N time units, the total number of time domain symbols occupied by the DMRS in each time unit is determined, and the number of DMRS in different time domain symbols can be different, thereby reducing the DMRS pilot overhead. In a possible implementation, the first signaling is RRC signaling. The RRC signaling can be carried by PDSCH.

[0010] In a possible implementation, in the DMRS pattern configured for N time units included in the RRC signaling, the number of DMRS configured for the first k time units in the N time units is greater than the number of DMRS configured for other time units except the first k time units, k is a positive integer, and 1<=k<N. That is, accurate channel estimation is performed through more DMRS pilots in the aforementioned k time units, which is convenient for correctly demodulating the data transmitted by the data channel where the DMRS is located, and the number of DMRS configured for other time units except the k time units is greater than that of the other time units except the k time units, which is conducive to reducing the DMRS pilot overhead and improving the system spectrum efficiency. In this implementation, the density of DMRS in the first k time units in the N time units is higher than the density of DMRS in the later time units, which is referred to as dense at the beginning and sparse at the end. In this implementation, the DMRS pattern configured for N time units can be that the number of DMRS configured for each time unit in the first k time units is greater than the number of DMRS configured for each time unit in other time units except the first k time units.

[0011] In a possible implementation, in the DMRS pattern configured for N time units included in the RRC signaling, the number of DMRS configured for the first k time units and the number of DMRS configured for the last m time units in the N time units are both greater than the number of DMRS configured for other time units in the N time units except the first k time units and the last m time units, k is a positive integer, and 1<=k<Nm, 1<=m<Nk. That is, more accurate channel estimation is performed through more DMRS pilots in the first k time units and the last m time units, and accurate interpolation estimation of channels in other time units is enabled, and the number of DMRS greater than the number of DMRS configured for other time units except the first k time units and the last m time units is conducive to reducing DMRS pilot overhead and improving system spectrum efficiency. In this implementation, the density of DMRS in the first k time units and the last m time units in the N time units is higher than the density of DMRS in the middle Nkm time units, which is referred to as dense at the front and back and sparse in the middle. In this implementation, the number of DMRS configured in each of the first k time units and the last m time units is greater than the number of DMRS configured in each of the middle Nkm time units. As for the density of DMRS in the first k time units and the last m time units, they can be the same or different, which is not limited in this implementation.

[0012] In a possible implementation, in the DMRS pattern configured for N time units included in the RRC signaling, the number of DMRS configured for each time unit in the first time unit set of the N time units is the same, the first time unit set includes at least one time unit in the N time units, at least one time unit is a time unit that is L time units apart from the 10th time unit, 10 is a positive integer, 1<=10<=N, and the other time units in the N time units except the first time unit set are not configured with DMRS or the number of configured DMRS is less than the number of DMRS configured for each time unit in the first time unit set. It can be seen that in this implementation, there is DMRS in each of the L time units, and DMRS may not be sent in other time units, thereby reducing the overhead of DMRS.

[0013] In a possible implementation, the DMRS pattern indicates the total number of DMRSs configured for each of the N time units, wherein the total number of DMRSs is the total number of front-loaded DMRSs and additional DMRSs.

[0014] In a possible implementation, the first signaling is downlink control information (Downlink Control Information, DCI) signaling.

[0015] In a possible implementation, the DCI signaling includes a first index value corresponding to N time units and the number of DMRSs in each time unit.

[0016] In a possible implementation, the DCI signaling is scrambled by a semi-persistent scheduling-cell-radio network temporary identity (sps-C-RNTI).

[0017] In a possible implementation, the total number of time domain symbols occupied by the DMRS in each time unit is the total number of time domain symbols occupied by the pre-DMRS and the additional DMRS in each time unit.

[0018] In a third aspect, an embodiment of the present application discloses a method for acquiring configuration information of a DMRS, the method comprising: receiving a DCI, wherein the DCI indicates scheduling information of a first time unit, and the DCI includes a DMRS pattern configured for the first time unit, the DMRS pattern is used to indicate the number of DMRSs in the first time unit, and the number of DMRSs in the first time unit is the total number of time domain symbols occupied by the DMRSs in the first time unit. Then, based on the total number of time domain symbols occupied by the DMRSs in the first time unit and the scheduling information, data is received or sent in the first time unit.

[0019] The method of this embodiment can be executed by a terminal device or by a chip in the terminal device. If it is executed by a chip, the chip can be a baseband processing chip, or it can be a baseband processing chip and a radio frequency unit. In this case, the act of receiving a signal can be understood as the act of a baseband processing chip (such as a baseband processor) in the terminal device demodulating a signal, or the act of inputting a signal into a baseband processing chip. Or the radio frequency unit outputs a signal to the baseband processing chip, and the baseband processing chip demodulates the input signal to obtain data or configuration information. Correspondingly, the act of sending a signal can be understood as the baseband processing chip generating an output signal, or the baseband processing chip outputting a signal to the radio frequency unit.

[0020] Correspondingly, in a fourth aspect, an embodiment of the present application discloses a DMRS configuration method, the method comprising: sending downlink control information DCI to a terminal device, wherein the DCI indicates scheduling information of a first time unit, and the DCI includes a DMRS pattern configured for the first time unit, the DMRS pattern is used to indicate the number of DMRS in the first time unit, and the number of DMRS in the first time unit is the total number of time domain symbols occupied by the DMRS in the first time unit. Then, based on the total number of time domain symbols occupied by the DMRS in the first time unit and the scheduling information, data is received or sent in the first time unit.

[0021] The method of this embodiment can be executed by a network device (such as a base station) or by a chip in the network device. If it is executed by a chip in the network device, the chip can be a baseband processing chip, or it can be a baseband processing chip and a radio frequency unit. In this case, the act of receiving a signal can be understood as the act of a baseband processing chip (such as a baseband processor) in the network device demodulating a signal, or the act of inputting a signal into a baseband processing chip. Or the radio frequency unit outputs a signal to the baseband processing chip, and the baseband processing chip demodulates the input signal to obtain data or configuration information. Correspondingly, the act of sending a signal can be understood as the baseband processing chip generating an output signal, or the baseband processing chip outputting a signal to the radio frequency unit.

[0022] In the third and fourth aspects above, since the total number of time domain symbols occupied by DMRS in different time units can be indicated by different DCIs, the total number of time domain symbols occupied by DMRS in each time unit can be flexibly and dynamically configured. In addition, the total number of time domain symbols occupied by DMRS in a time unit is configured through DCI, which can be flexibly configured according to demand, for example, fewer DMRS can be configured, thereby reducing DMRS pilot overhead.

[0023] Among them, DCI can be carried by PDCCH.

[0024] In a possible implementation, the total number of DMRS configured for the first time unit is included in the DCI, or the first field includes an index value, and the total number of DMRS configured for the first time unit is indicated by the index value. The total number of DMRS is the total number of pre-DMRS and additional DMRS.

[0025] In one possible implementation, the DCI includes the number of DMRS added or deleted for the first time unit, or the first field includes an index value, and the index value indicates the number of DMRS added or deleted for the first time unit. The number of DMRS added or deleted for the first time unit indicates the total number of DMRS configured for the first time unit. The total number of DMRS is the total number of pre-DMRS and additional DMRS.

[0026] In a possible implementation, the total number of time domain symbols occupied by the DMRS configured for the first time unit indicated by the DCI is 0.

[0027] In a possible implementation, the DCI indicates that the total number of time domain symbols occupied by the DMRS configured for the first time unit is 0 through a redundant state of code division multiplexing (CDM).

[0028] In one possible implementation, based on the total number of time domain symbols occupied by DMRS in the first time unit and the scheduling information, the method of receiving data in the first time unit can be: based on the scheduling information and the DMRS on the second time unit, the data received on the first time unit is demodulated, wherein the second time unit is before the first time unit.

[0029] In one possible implementation, the DCI is scrambled by the sps-C-RNTI.

[0030] In a fifth aspect, the present application further provides an apparatus, which may be a terminal device, or an apparatus in a terminal device, or an apparatus that can be used in conjunction with a terminal device. In one design, the apparatus may include a module corresponding to the method / operation / step / action described in the first aspect, and the module may be a hardware circuit, or software, or a combination of a hardware circuit and software. In one design, the apparatus may include a communication module. Exemplarily,

[0031] The communication module is used to receive the first signaling, and based on the total number of time domain symbols occupied by the DMRS in each time unit, receive or send data in N time units. The description of the first signaling and the DMRS pattern can refer to the corresponding description in the first aspect, and is not specifically limited here.

[0032] In a sixth aspect, the present application further provides an apparatus, which may be a terminal device, or an apparatus in a terminal device, or an apparatus that can be used in conjunction with a terminal device. In one design, the apparatus may include a module corresponding to the method / operation / step / action described in the third aspect, and the module may be a hardware circuit, or software, or a combination of a hardware circuit and software. In one design, the apparatus may include a communication module. Exemplarily,

[0033] The communication module is used to receive DCI, and based on the total number of time domain symbols occupied by DMRS in the first time unit and the scheduling information, receive or send data in the first time unit. The DCI and the method for receiving data in the first time unit can refer to the corresponding description in the third aspect, which is not specifically limited here.

[0034] In a seventh aspect, the present application further provides a device, which may be a network device, or a device in a network device, or a device that can be used in conjunction with a network device. In one design, the device may include a module that performs the method / operation / step / action described in the second aspect, and the module may be a hardware circuit, or software, or a combination of a hardware circuit and software. In one design, the device may include a communication module. Exemplarily,

[0035] The communication module is used to send a first signaling to the terminal device, and receive or send data in N time units based on the total number of time domain symbols occupied by DMRS in each time unit. The first signaling and DMRS pattern can refer to the corresponding description in the second aspect and are not specifically limited here.

[0036] In an eighth aspect, the present application further provides an apparatus, which may be a network device, or an apparatus in a network device, or an apparatus that can be used in conjunction with a network device. In one design, the apparatus may include a module corresponding to the method / operation / step / action described in the fourth aspect, and the module may be a hardware circuit, or software, or a combination of a hardware circuit and software. In one design, the apparatus may include a communication module. Exemplarily,

[0037] A communication module is used to send DCI to a terminal device, and based on the total number of time domain symbols occupied by DMRS in the first time unit and scheduling information, receive or send data in the first time unit. The DCI and the method for receiving data in the first time unit can refer to the corresponding description in the fourth aspect, which is not specifically limited here.

[0038] In a ninth aspect, an embodiment of the present application discloses a device, which includes one or more processors for implementing the method described in the first aspect above. The device may also include a memory for storing instructions and data. The memory is coupled to the one or more processors, and when the one or more processors execute the instructions stored in the memory, the method described in the first aspect above can be implemented. The device may also include a communication interface, which is used for the device to communicate with other devices. Exemplarily, the communication interface can be a transceiver, circuit, bus, module or other type of communication interface. In one possible device, the device includes:

[0039] One or more processors are used to receive the first signaling using the communication interface, and receive or send data in N time units based on the total number of time domain symbols occupied by the DMRS in each time unit. The first signaling and the DMRS pattern can refer to the corresponding description in the first aspect and are not specifically limited here.

[0040] In a tenth aspect, an embodiment of the present application discloses a device, which includes one or more processors for implementing the method described in the third aspect above. The device may also include a memory for storing instructions and data. The memory is coupled to the one or more processors, and when the one or more processors execute the instructions stored in the memory, the method described in the second aspect above can be implemented. The device may also include a communication interface, which is used for the device to communicate with other devices. Exemplarily, the communication interface can be a transceiver, circuit, bus, module or other type of communication interface. In one possible device, the device includes:

[0041] One or more processors are used to receive DCI using a communication interface, and receive or send data in a first time unit based on the total number of time domain symbols occupied by DMRS in the first time unit and scheduling information. The DCI and the method for receiving data in the first time unit can refer to the corresponding description in the third aspect, which is not specifically limited here.

[0042] In an eleventh aspect, an embodiment of the present application discloses a device, the device comprising one or more processors, for implementing the method described in the second aspect above. The device may also include a memory for storing instructions and data. The memory is coupled to the one or more processors, and when the one or more processors execute the instructions stored in the memory, the method described in the second aspect above can be implemented. The device may also include a communication interface, and the communication interface is used for the device to communicate with other devices. Exemplarily, the communication interface may be a transceiver, circuit, bus, module or other type of communication interface. In one possible device, the device includes:

[0043] One or more processors are used to send a first signaling to a terminal device using a communication interface, and receive or send data in N time units based on the total number of time domain symbols occupied by DMRS in each time unit. The first signaling and DMRS pattern can refer to the corresponding description in the second aspect and are not specifically limited here.

[0044] In a twelfth aspect, an embodiment of the present application discloses a device, which includes one or more processors for implementing the method described in the first aspect above. The device may also include a memory for storing instructions and data. The memory is coupled to the one or more processors, and when the one or more processors execute the instructions stored in the memory, the method described in the fourth aspect above can be implemented. The device may also include a communication interface, which is used for the device to communicate with other devices. Exemplarily, the communication interface can be a transceiver, circuit, bus, module or other type of communication interface. In one possible device, the device includes:

[0045] One or more processors are used to send DCI to a terminal device using a communication interface, and receive or send data in a first time unit based on the total number of time domain symbols occupied by DMRS in the first time unit and scheduling information. The DCI and the method for receiving data in the first time unit can refer to the corresponding description in the fourth aspect, which is not specifically limited here.

[0046] In the thirteenth aspect, an embodiment of the present application further provides a computer-readable storage medium, comprising instructions, which, when executed on a computer, enables the computer to execute the method described in the first aspect or the third aspect.

[0047] In the fourteenth aspect, an embodiment of the present application further provides a computer-readable storage medium, comprising instructions, which, when executed on a computer, enables the computer to execute the method described in the second aspect or the fourth aspect.

[0048] In a fifteenth aspect, an embodiment of the present application provides a chip system, which includes one or more processors and may also include a memory, for implementing the method described in the first aspect or the third aspect. The chip system may be composed of a chip, or may include a chip and other discrete devices.

[0049] In a sixteenth aspect, an embodiment of the present application provides a chip system, which includes a processor and may also include a memory, for implementing the method described in the second aspect or the fourth aspect. The chip system may be composed of a chip, or may include a chip and other discrete devices.

[0050] In the seventeenth aspect, an embodiment of the present application provides a system, which includes the device described in the fifth aspect or the ninth aspect, and the device described in the seventh aspect or the eleventh aspect.

[0051] In the eighteenth aspect, an embodiment of the present application provides a system, which includes the device described in the sixth aspect or the tenth aspect, and the device described in the eighth aspect or the twelfth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a structural diagram of a communication system disclosed in an embodiment of the present application;

[0053] Figure 2 is a schematic diagram of a DMRS resource pattern disclosed in an embodiment of the present application;

[0054] Figure 3 is a schematic diagram of another DMRS resource pattern disclosed in an embodiment of the present application;

[0055] Figure 4 It is a flowchart of a DMRS configuration method disclosed in an embodiment of the present application;

[0056] Figure 5 It is a flowchart of another DMRS configuration method disclosed in an embodiment of the present application;

[0057] Figure 6 is a schematic diagram of another DMRS resource pattern disclosed in an embodiment of the present application;

[0058] Figure 7 is a schematic diagram of another DMRS resource pattern disclosed in an embodiment of the present application;

[0059] Figure 8 is a schematic diagram of another DMRS resource pattern disclosed in an embodiment of the present application;

[0060] Fig. 9 is a schematic diagram of the structure of another communication system provided in an embodiment of the present application;

[0061] Fig.10 is a schematic diagram of the structure of another communication system provided in an embodiment of the present application;

[0062] Fig.11 It is a structural schematic diagram of a device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0063] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0064] Below, some terms in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

[0065] 1) Terminal equipment, including equipment that provides voice and / or data connectivity to users, specifically, including equipment that provides voice to users, or including equipment that provides data connectivity to users, or including equipment that provides voice and data connectivity to users. For example, it may include a handheld device with wireless connection function, or a processing device connected to a wireless modem. The terminal equipment can communicate with the core network via the radio access network (RAN), exchange voice or data with the RAN, or exchange voice and data with the RAN. The terminal device may include user equipment (UE), wireless terminal equipment, mobile terminal equipment, device-to-device (D2D) terminal equipment, vehicle to everything (V2X) terminal equipment, machine-to-machine / machine-type communications (M2M / MTC) terminal equipment, Internet of Things (IoT) terminal equipment, subscriber unit, subscriber station, mobile station, remote station, access point (AP), remote terminal, access terminal, user terminal, user agent, or user equipment, etc. For example, it may include a mobile phone (or "cellular" phone), a computer with a mobile terminal device, a portable, pocket-sized, handheld, or computer-built-in mobile device, etc. For example, personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDA), etc. It also includes limited devices, such as devices with low power consumption, or devices with limited storage capacity, or devices with limited computing power, etc. For example, it includes information sensing devices such as barcodes, radio frequency identification (RFID), sensors, global positioning systems (GPS), laser scanners, etc.

[0066] As an example but not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable devices may also be referred to as wearable smart devices or smart wearable devices, etc., which are a general term for the application of wearable technology to intelligently design and develop wearable devices for daily wear, such as glasses, gloves, watches, clothing and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also powerful functions achieved through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include full-featured, large-sized, and independent of smartphones to achieve complete or partial functions, such as smart watches or smart glasses, etc., as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various types of smart bracelets, smart helmets, and smart jewelry for vital sign monitoring.

[0067] The various terminal devices introduced above, if located on a vehicle (eg, placed in or installed in a vehicle), can be considered as vehicle-mounted terminal devices, which are also called on-board units (OBU).

[0068] In the embodiments of the present application, it can also be understood that anything that can communicate data with a base station can be regarded as a terminal device.

[0069] 2) Network equipment, for example, including access network (AN) equipment, such as base stations (e.g., access points), which can refer to equipment in the access network that communicates with wireless terminal devices over the air interface through one or more cells, or, for example, a network device in a vehicle-to-everything (V2X) technology is a roadside unit (RSU). The base station can be used to convert received air frames to and from IP packets, acting as a router between the terminal device and the rest of the access network, where the rest of the access network may include an IP network. The RSU can be a fixed infrastructure entity that supports V2X applications and can exchange messages with other entities that support V2X applications. The network equipment can also coordinate the attribute management of the air interface. For example, the network device may include an evolved base station (NodeB or eNB or e-NodeB, evolutional NodeB) in an LTE system or long term evolution-advanced (LTE-A), or may also include a next generation node B (next generation node B, gNB) in a 5G NR system (also referred to as an NR system), or may also include a centralized unit (CU) and a distributed unit (DU) in a cloud access network (Cloud radio access network, Cloud RAN) system, but the embodiments of the present application are not limited.

[0070] 3) Relay: For cellular wireless communication networks such as NR or LTE, the performance of the cell edge can be improved by adding intermediate nodes. Such intermediate nodes are usually called relays, or relay nodes, relay devices, or relay equipment. Relays can be used to receive signals from terminal devices and forward signals received from terminal devices to network devices. Relays can be implemented through terminal devices or network devices, such as wireless access points (APs).

[0071] 4) Time unit, such as a slot or a subframe, or other time units, such as a mini slot. A mini slot may include multiple OFDM symbols or DFT-S-OFDM symbols.

[0072] 5) Time slot: In the NR system, a time slot can be configured to include 14 orthogonal frequency division multiplexing (OFDM) symbols. For example, the time slot length corresponding to the 15kHz subcarrier spacing is 1ms, and the time slot length corresponding to the 30kHz subcarrier spacing is 0.5ms.

[0073] 6) The terms "system" and "network" in the embodiments of the present application can be used interchangeably. "At least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0074] Furthermore, unless otherwise specified, ordinal numbers such as "first" and "second" mentioned in the embodiments of the present application are used to distinguish multiple objects, and are not used to limit the order, timing, priority or importance of multiple objects. For example, the first value and the second value are only used to distinguish different values, and do not indicate the difference in the content, priority or importance of the two values.

[0075] The following describes the communication system implemented in this application. Figure 1 , Figure 1 It is a structural diagram of a communication system disclosed in an embodiment of the present application. The communication system may include at least one terminal device and at least one network device, wherein the terminal device establishes a communication connection with the network device.

[0076] In the traditional DMRS configuration method, the network device indicates the total number of time domain symbols occupied by the DMRS of the terminal device through RRC signaling, and the DMRS configuration is applicable to each TTI after the configuration. In this way, the total number of time domain symbols occupied by the DMRS configured in each TTI is the same. When the channel quality is poor, the insufficient number of DMRS will reduce the accuracy of channel estimation; when the channel quality is good, the large number of DMRS will result in a large DMRS pilot overhead. Based on this, the traditional DMRS configuration method cannot adapt to the channel characteristics, and if the number of configured DMRS is too large, it will result in a large DMRS pilot overhead. Therefore, it is impossible to flexibly configure the total number of time domain symbols occupied by DMRS in each TTI in the prior art.

[0077] An embodiment of the present application includes the following steps.

[0078] The network device sends a first signaling, and the terminal device receives the first signaling.

[0079] The first signaling includes a DMRS pattern configured for N time units, where the DMRS pattern is used to indicate the number of DMRS in each time unit, where the number of DMRS in each time unit is the total number of time domain symbols occupied by the DMRS in each time unit, and the total number of time domain symbols occupied by the DMRS configured in at least two of the N time units is different, where N is a positive integer greater than 1.

[0080] The terminal device may receive or send data in N time units based on the total number of time domain symbols occupied by DMRS in each time unit. Correspondingly, the network device may also send or receive data based on the total number of time domain symbols occupied by DMRS in each time unit.

[0081] In this embodiment, for the transmitting side, based on the total number of time domain symbols occupied by DMRS in each time unit, data is sent in N time units, which means mapping DMRS to a data channel based on the total number of time domain symbols occupied by DMRS in each time unit, and sending the data channel. For the receiving side, based on the total number of time domain symbols occupied by DMRS in each time unit, data is received in N time units, which means determining the position of DMRS based on the total number of time domain symbols occupied by DMRS in each time unit, and performing channel estimation based on DMRS to correctly demodulate the data transmitted by the data channel.

[0082] Through the embodiments of the present application, the network device can flexibly configure the total number of time domain symbols occupied by DMRS in each of N time units, thereby reducing DMRS pilot overhead.

[0083] The embodiment of the present application configures the resource allocation of the DMRS pattern in the time-frequency domain, but the position mapping of the DMRS on the time-frequency resources is also related to the mapping type (mappingType) of the PUSCH (or the mapping type of the PDSCH) and the number of symbols scheduled in each time unit. The embodiment of the present application is mainly used to describe whether the network device configures DMRS for at least one time unit. If DMRS is configured for a certain time unit, the network device can also indicate the number of configured DMRS. DMRS can include pre-DMRS and additional DMRS.

[0084] The number of DMRS in the embodiments of the present application refers to the number of DMRS configured for one time unit.

[0085] The number of DMRS in each time unit is the total number of time domain symbols occupied by DMRS in each time unit. Among them, the total number of DMRS in the embodiment of the present application is the total number of pre-DMRS and additional DMRS. The network device configures the total number of DMRS for a certain time unit, and the total number of DMRS is used to indicate how many DMRS the network device has configured for the time unit. Assuming that the total number of DMRS is 2, it means that the network device has configured 2 DMRS for the time unit, namely, a pre-DMRS and an additional DMRS, and the network device configures each DMRS to occupy two time domain symbols, then the total number of time domain symbols occupied by DMRS in the time unit is 4, that is, the number of DMRS in the time unit is 4.

[0086] The total number of time domain symbols occupied by the DMRS in each time unit is the total number of time domain symbols occupied by the pre-DMRS and the additional DMRS in each time unit.

[0087] The number of additional DMRSs may be 0, and the number of pre-DMRSs may also be 0.

[0088] The first signaling may be RRC signaling or DCI signaling. DCI signaling is carried on PDCCH, and DCI signaling may also be used to schedule PDSCH and / or PUSCH, that is, to indicate configuration information such as the time-frequency resource location or modulation mode for transmitting data. DCI signaling can be used to dynamically configure the number of DMRS in each time unit in real time, which is very flexible.

[0089] In a conventional DMRS configuration method, the DMRS quantity is configured by the value of a field in a DMRS pattern and is sent to a terminal device through RRC signaling.

[0090] Table 1: DMRSpattern related fields

[0091]

[0092] In Table 1, DMRS-type determines the resource pattern of Front-loaded DMRS in the frequency domain. When DMRS-type is configured as type1, each physical resource block (PRB) in the frequency domain has two groups of CDM, and each group of 6 subcarriers of CDM can support 2 streams (Layer) data transmission through orthogonal cover code (OCC). Therefore, type1 can support 4 layers of data transmission on a single symbol. When DMRS-type is configured as type2, each PRB in the frequency domain has three groups of CDM, and each group of 4 subcarriers of CDM can support 2 layers through OCC. Therefore, type2 can support 6 layers of data transmission on a single symbol.

[0093] In Table 1, maxLength determines the number of symbols of Front-loaded DMRS in the time domain. When maxLength is configured as single, Front-loaded DMRS occupies only one time domain symbol in the time domain. When maxLength is configured as double, Front-loaded DMRS can occupy two consecutive symbols in the time domain.

[0094] When the front-loaded DMRS occupies one time domain symbol, if additional DMRS is configured, each additional DMRS also occupies one time domain symbol. When the front-loaded DMRS occupies two consecutive time domain symbols, if additional DMRS is configured, each additional DMRS also occupies two consecutive time domain symbols.

[0095] In Table 1, dmrs-additionalPosition determines whether to configure AdditionalDMRS in the time unit. When AdditionalPosition is configured as Pos0, it means that no AdditionalDMRS is configured in the time unit. When AdditionalPosition is configured as Pos1, it means that one AdditionalDMRS is configured in the time unit. When AdditionalPosition is configured as Pos2, it means that two AdditionalDMRS are configured in the time unit. When AdditionalPosition is configured as Pos3, it means that three AdditionalDMRS are configured in the time unit.

[0096] by Figure 2 Taking the schematic diagram of the DMRS pattern shown as an example, assuming that maxLength is configured as single, that is, the front-loaded DMRS occupies one time domain symbol, the network device can configure dmrs-additionalPosition to Pos0, Pos1, Pos2 or Pos3 to enable DMRS to occupy different DMRS numbers in the time domain to meet the current requirements for accurate channel estimation. Based on this, when maxLength is configured as single, the network device can configure dmrs-additionalPosition to pos0, pos1, pos2 or pos3.

[0097] by Figure 3 Taking the schematic diagram of the DMRS pattern shown as an example, assuming that maxLength is configured as double and the front-loaded DMRS occupies two time domain symbols, the network device can configure dmrs-additionalPosition to Pos0 or Pos1 to enable DMRS to occupy different numbers of DMRS in the time domain to meet the current requirements for accurate channel estimation. Based on this, when maxLength is configured as double, the network device can configure dmrs-additionalPosition to pos0 or pos1.

[0098] In one implementation, the network device may configure the number of time units, that is, the value of N, through RRC signaling. The network device may also configure the dmrs-Type, maxLength, and DMRS quantity of N time units through RRC signaling. Among them, the dmrs-Type and maxLength of N time units may become DMRS configuration information.

[0099] In one implementation, the network device may indicate the starting time domain symbol position of DMRS when the current time unit is a Type A PDSCH / PUSCH through DCI signaling. For example, when the value of the corresponding field in the DCI is 0, it means that the front loaded DMRS starts from the third time domain symbol position; when the value of the corresponding field in the DCI is 1, it means that the front loaded DMRS starts from the fourth time domain symbol position, and the delay is small.

[0100] The network device can indicate through DCI signaling whether the mapping type of the DMRS of the current time unit is Type 1 or Type 2. Type 2 DMRS can support more users or more parallel data streams. When the channel conditions are good or more terminal devices need to be supported, the DMRS-Type can be configured as Type 2.

[0101] The network device can indicate the maxlength of the DMRS of the current time unit through DCI signaling, that is, the Front-loaded DMRS occupies 1 time domain symbol or 2 consecutive time domain symbols. When maxlength=2, the time domain OCC can support twice as many users / data streams.

[0102] Exemplarily, the network device may dynamically indicate the DMRS of one time unit, for example, a 1-bit field is added to the DCI signaling to indicate two states, Type 1 and Type 2, or to indicate whether to reverse the state compared to a predefined state.

[0103] Exemplarily, the network device may indicate semi-statically, for example, whether an update is required through sps-C-RNTI-scrambled DCI signaling, and the newly added 1-bit indication method in the DCI signaling is the same as above. If there is no sps-C-RNTI-scrambled DCI indicating an update, the same DMRS configuration as last time is always used.

[0104] In one implementation, if the network device configures a DMRS pattern for multiple time units through a first signaling, that is, the DMRS configuration of the multiple time units is a joint configuration, then at least one of the multiple time units may not have a DMRS or have a small number of configured DMRS. The small number of DMRS configured for at least one of the multiple time units can be understood as: the number of DMRS configured for at least one time unit is less than the number of DMRS configured for other time units in the multiple time units except for the above-mentioned at least one time unit. For time units that are not configured with DMRS or have a small number of configured DMRS, the terminal device can reuse the channel estimation results of the most recent one or several time units that are configured with DMRS or have a large number of configured DMRS during channel estimation, that is, the terminal device can demodulate the data received on the first time unit based on the scheduling information and the DMRS on the second time unit, where the second time unit is before the first time unit. Optionally, for time units that are not configured with DMRS or are configured with a small number of DMRS, the terminal device may intercept several time units through the time window, perform joint channel estimation on all time units that are configured with DMRS among the intercepted time units, and obtain a channel estimation result, and the terminal device may use the channel estimation result as the channel estimation result for time units that are not configured with DMRS or are configured with a small number of DMRS. For example, if the time window intercepts 5 time units, of which two time units are configured with a large number of DMRS, the terminal device may perform joint channel estimation on the above two time units, and use the channel estimation result obtained by the joint channel estimation as the channel estimation result for time units that are not configured with DMRS or are configured with a small number of DMRS.

[0105] Table 2: Spectral efficiency (unit: bps / Hz)

[0106]

[0107] In Table 2, taking the periodic configuration of DMRS patterns for multiple time units as an example, the pilot overhead savings and spectrum efficiency gains that can be achieved when periodic DMRS configuration is performed for different numbers of time units are given. Wherein, Period = 1, indicating that DMRS configuration is performed with a period of 1 time unit. Period = 5, indicating that DMRS configuration is performed with a period of 5 time units, wherein the first time unit of the 5 time units is configured with DMRS, and the other four time units are not configured with DMRS. Period = 10, indicating that DMRS configuration is performed with a period of 10 time units, wherein the first time unit of the 10 time units is configured with DMRS, and the other nine time units are not configured with DMRS. Period = 20, indicating that DMRS configuration is performed with a period of 20 time units, wherein the first time unit of the 20 time units is configured with DMRS, and the other nineteen time units are not configured with DMRS. Column 1 indicates that 1 DMRS is configured, column 2 indicates that 2 DMRS are configured, column 3 indicates that 3 DMRS are configured, and column 4 indicates that 4 DMRS are configured. The unit of spectral efficiency (SE) is bps / Hz. SNR = -2.5dB, indicating the signal-to-noise ratio of the current transmission channel.

[0108] Simulation parameter settings: 3Km / h mobile speed, TDL-E fading channel (LoS), 2T8R MIMO configuration, 5MHz bandwidth, PDSCH-MappingType=TypeA, dmrs-Type=type1, maxLength=single, additionalPosition=pose2.

[0109] The simulation results show that when two columns of DMRS time domain symbols are used, higher spectrum efficiency can be achieved. In addition, when one DMRS time domain symbol is used, the channel estimation is not accurate enough, resulting in unsatisfactory data demodulation and affecting the spectrum efficiency. When three or four DMRS time domain symbols are used, the DMRS pilot overhead is large, resulting in unsatisfactory spectrum efficiency. Therefore, the number of DMRS should be reasonably configured, for example, according to the channel conditions, while ensuring a certain channel estimation accuracy, the DMRS pilot overhead should be appropriately reduced.

[0110] based on Figure 1 The communication system shown is shown in Figure 4 , Figure 4 A DMRS configuration method provided in an embodiment of the present application includes but is not limited to the following steps:

[0111] Step S401: The network device sends a DCI signaling to the terminal device via the PDCCH, and the terminal device receives the DCI signaling, wherein the DCI signaling indicates scheduling information of N time units, and the DCI signaling includes a DMRS pattern configured for the N time units, the DMRS pattern is used to indicate the number of DMRSs in each time unit, N>=1, and N is a positive integer.

[0112] The scheduling information may be used to indicate configuration information such as the time-frequency resource location or modulation method of uplink data transmission, or the scheduling information may be used to indicate configuration information such as the time-frequency resource location or modulation method of downlink data transmission.

[0113] In one implementation, the network device may dynamically configure the DMRS of each time unit, that is, the network device sends a DCI to the terminal device, the DCI indicates scheduling information of the first time unit, and the DCI includes a DMRS pattern configured for the first time unit, and the DMRS pattern is used to indicate the number of DMRS in the first time unit. The first time unit may be any one of the at least one time unit mentioned above.

[0114] The network device may dynamically configure the DMRS of each time unit in the following seven ways:

[0115] 1. The DCI signaling includes the redundant state of CDM, and the redundant state of CDM is used to indicate that no DMRS is configured for the first time unit. That is, the DCI indicates through the redundant state of CDM that the total number of time domain symbols occupied by the DMRS configured for the first time unit is 0.

[0116] For example, if the DMRS of a certain time unit needs to be released, the network device can indicate that there is no DMRS symbol in the time unit according to the redundant status of the CDM&DMRS port (DMRS Port) indicated in the DCI signaling. For example, the network device can indicate the redundant status of the DMRS antenna port (DMRS antenna port) according to the DCI signaling. When dmrs-type=1, maxlength=1, rank=1, the CDM value 6-7 in TR38.212 Table 7.3.1.1.2-7 is an unconfigured value, so it can be configured that when the CDM value is 6, it is used to indicate that the time unit is not configured with DMRS.

[0117] 2. The DCI signaling includes a first field, and the first field includes the total number of DMRS configured for the first time unit.

[0118] In a specific implementation, the network device may add a dmrsChange field in the DCI signaling, which includes the total number of DMRS configured for the first time unit. For example, assuming that the network device configures 2 DMRS for the first time unit, the network device may add a dmrsChange field in the DCI signaling, and the value of the dmrsChange field is 2. The network device sends the DCI with the newly added dmrsChange field to the terminal device. Based on the value of the dmrsChange field in the DCI, the terminal device can determine that the network device configures 2 DMRS for the first time unit.

[0119] 3. The DCI signaling includes a first field, the first field includes an index value, and the index value indicates the total number of DMRSs configured for the first time unit.

[0120] In a specific implementation, the network device may add a dmrsChange field in the DCI signaling, where the field includes an index value, where the index value indicates the total number of DMRS configured for the first time unit, where the total number of DMRS is the total number of pre-DMRS and additional DMRS.

[0121] Table 3: First field used to indicate the total number of DMRS

[0122]

[0123] In Table 3, assuming that maxLength is configured as single, dmrs-additionalPosition can be pos0, pos1, pos2 or pos3, that is, AdditionalDMRS can be configured with any value from 0 to 3. If the network device configures 1 front-load DMRS for the time unit, the total number of DMRS configured by the network device can be any value from 1 to 4, and the network device can add 2 bits in the DCI signaling to indicate the total number of DMRS configured for the time unit, that is, the length of the dmrsChange field is 2 bits. For example, if the dmrsChange field is "00", it means that the total number of DMRS configured by the network device for the time unit is 1, that is, 1 front-load DMRS is configured for the time unit, and no AdditionalDMRS is configured. If the dmrsChange field is "01", it means that the total number of DMRS configured by the network device for the time unit is 2, that is, 1 front-load DMRS is configured for the time unit, and 1 AdditionalDMRS is configured. The dmrsChange field is "10", indicating that the total number of DMRS configured by the network device for this time unit is 3, that is, 1 front-load DMRS and 2 AdditionalDMRS are configured for this time unit. The dmrsChange field is "11", indicating that the total number of DMRS configured by the network device for this time unit is 4, that is, 1 front-load DMRS and 3 AdditionalDMRS are configured for this time unit.

[0124] For example, assuming that maxLength is configured as double, then dmrs-additionalPosition can be pos0 or pos1, that is, 0 or 1 AdditionalDMRS can be configured. If the network device configures 1 front-load DMRS for the time unit, the total number of DMRS configured by the network device can be 1 or 2. The network device can add 1 bit in the DCI signaling to indicate the total number of DMRS configured for the time unit, that is, the length of the dmrsChange field is 1 bit. For example, if the dmrsChange field is "0", it means that the total number of DMRS configured by the network device for the time unit is 1, that is, 1 front-load DMRS is configured for the time unit, and no AdditionalDMRS is configured. If the dmrsChange field is "1", it means that the total number of DMRS configured by the network device for the time unit is 2, that is, 1 front-load DMRS and 1 AdditionalDMRS are configured for the time unit.

[0125] In the above example, the network device configures one front-load DMRS for the time unit, so the total number of DMRS configured for the time unit is at least one. If the network device does not configure a DMRS for the time unit, the network device may indicate that the time unit is not configured with a DMRS through the redundant state of CDM.

[0126] Table 4: First field used to indicate the total number of DMRS

[0127]

[0128] In Table 4, assuming that maxLength is configured as single, dmrs-additionalPosition can be pos0, pos1, pos2 or pos3, that is, AdditionalDMRS can be configured with any value from 0 to 3. If the time unit is not configured with front-load DMRS, the total number of DMRS configured by the network device for the time unit is 0; if the time unit is configured with 1 front-load DMRS, the total number of DMRS configured by the network device for the time unit is any value from 1 to 4. The network device can add 3 bits in the DCI signaling to indicate the total number of DMRS configured for the time unit, that is, the length of the dmrsChange field is 3 bits. For example, the dmrsChange field is "000", indicating that the total number of DMRS configured by the network device for the time unit is 0, that is, no DMRS is configured for the time unit. The dmrsChange field is "001", indicating that the total number of DMRS configured by the network device for the time unit is 1. The dmrsChange field is "010", indicating that the total number of DMRS configured by the network device for this time unit is 2. The dmrsChange field is "011", indicating that the total number of DMRS configured by the network device for this time unit is 3. The dmrsChange field is "100", indicating that the total number of DMRS configured by the network device for this time unit is 4.

[0129] For example, assuming that maxLength is configured as double, then dmrs-additionalPosition can be pos0 or pos1, that is, 0 or 1 AdditionalDMRS can be configured. If the time unit is not configured with front-loadDMRS, the total number of DMRS configured by the network device is 0; if the time unit is configured with 1 front-load DMRS, the total number of DMRS configured by the network device can be 1 or 2. The network device can add 2 bits in the DCI signaling to indicate the total number of DMRS configured for the time unit, that is, the length of the dmrsChange field is 2 bits. For example, the dmrsChange field is "00", indicating that the network device has not configured DMRS for the time unit. The dmrsChange field is "01", indicating that the total number of DMRS configured by the network device for the time unit is 1. The dmrsChange field is "10", indicating that the total number of DMRS configured by the network device for the time unit is 2.

[0130] 4. The total number of time domain symbols occupied by the DMRS configured for the first time unit indicated by the DCI is 0.

[0131] For example, when the network device does not configure a DMRS for a time unit, the total number of time domain symbols occupied by the DMRS configured for the first time unit indicated by the DCI is zero.

[0132] Table 5: DMRS antenna port index indication

[0133]

[0134]

[0135] Assuming that the network device configures dmrs-type as type2 and MaxLength as single (in the present invention, maxlength is single and maxlength=1 is equivalent), in Table 5, the network device indicates the DMRS antenna port number used by the time unit and the CDM where the DMRS pilot is located through 4 bits in the DCI signaling. The CDM number corresponding to the index value 7-15 is reserved, and the network device can define that when the index value is 7, it indicates that the time unit is not configured with DMRS.

[0136] 5. The DCI signaling includes a first field, and the first field includes the number of DMRS added or deleted for the first time unit. The number of DMRS added is the number of DMRS added relative to the total number of preconfigured DMRS, that is, the number of DMRS added based on the total number of preconfigured DMRS. The number of DMRS deleted is the number of DMRS deleted relative to the total number of preconfigured DMRS, that is, the number of DMRS deleted based on the total number of preconfigured DMRS. The total number of preconfigured DMRS can be configured by the network device through RRC signaling. The terminal device can determine the total number of DMRS configured for the first time unit based on the first field and the total number of preconfigured DMRS.

[0137] In a specific implementation, the network device may add a dmrsChange field in the DCI signaling, where the field includes the number of DMRSs added or deleted in the first time unit.

[0138] For example, assuming that maxLength is configured as single, then based on the total number of preconfigured DMRS, the number of DMRS that the network device can add is 0, 1, 2, or 3, that is, the total number of DMRS after the addition can be 0, 1, 2, 3, or 4; based on the total number of preconfigured DMRS, the number of DMRS that the network device can delete is 0, 1, 2, 3, or 4, that is, the total number of DMRS after the deletion can be 0, 1, 2, 3, or 4. In other words, based on the total number of preconfigured DMRS, the number of DMRS added or deleted by the network device can be -4, -3, -2, -1, 0, 1, 2, or 3. The value of the dmrsChange field is "-4", indicating that the network device deletes 4 DMRSs based on the total number of pre-configured DMRSs; the value of the dmrsChange field is "-3", indicating that the network device deletes 3 DMRSs based on the total number of pre-configured DMRSs; the value of the dmrsChange field is "-2", indicating that the network device deletes 2 DMRSs based on the total number of pre-configured DMRSs; the value of the dmrsChange field is "-1", indicating that the network device deletes 1 DMRS based on the total number of pre-configured DMRSs; the value of the dmrsChange field is "1", indicating that the network device adds 1 DMRS based on the total number of pre-configured DMRSs; the value of the dmrsChange field is "2", indicating that the network device adds 2 DMRSs based on the total number of pre-configured DMRSs; the value of the dmrsChange field is "3", indicating that the network device adds 3 DMRSs based on the total number of pre-configured DMRSs; the value of the dmrsChange field is "0", indicating that the total number of DMRSs configured by the network device for the first time unit is the total number of pre-configured DMRSs.

[0139] For example, assuming that maxLength is configured as double, then based on the total number of preconfigured DMRS, the number of DMRS that the network device can add is 0, 1, that is, the total number of DMRS after the addition can be 0, 1, or 2; based on the total number of preconfigured DMRS, the number of DMRS that the network device can delete is 0, 1, or 2, that is, the total number of DMRS after the deletion can be 0, 1, or 2. In other words, based on the total number of preconfigured DMRS, the number of DMRS added or deleted by the network device can be -2, -1, 0, or 1. The value of the dmrsChange field is "-2", indicating that the network device deletes 2 DMRS based on the total number of preconfigured DMRS; the value of the dmrsChange field is "-1", indicating that the network device deletes 1 DMRS based on the total number of preconfigured DMRS; the value of the dmrsChange field is "1", indicating that the network device adds 1 DMRS based on the total number of preconfigured DMRS; the value of the dmrsChange field is "0", indicating that the total number of DMRS configured by the network device for the first time unit is the total number of preconfigured DMRS.

[0140] 6. The DCI signaling includes a first field, the first field includes an index value, and the index value is used to indicate the number of DMRSs added or deleted in the first time unit.

[0141] For example, the network device defines an index value of a dmrsChange field in DCI signaling, and the index value is used to indicate the number of DMRSs added or deleted based on the total number of pre-configured DMRSs.

[0142] Table 6: Index value of the number of DMRS added or deleted

[0143]

[0144] Assuming that the network device configures MaxLength as single, the network device can add 3 bits in the DCI signaling to indicate the number of DMRS added or deleted for the first time unit, that is, the length of the dmrsChange field is 3 bits. In Table 6, the index value is "000", indicating that the number of DMRS deleted by the network device for this time unit is 4. The index value is "001", indicating that the number of DMRS deleted by the network device for this time unit is 3. The index value is "010", indicating that the number of DMRS deleted by the network device for this time unit is 2. The index value is "011", indicating that the number of DMRS deleted by the network device for this time unit is 1. The index value is "100", indicating that the number of DMRS added or deleted by the network device for this time unit is 0. The index value is "101", indicating that the number of DMRS added by the network device for this time unit is 1. The index value is "110", indicating that the number of DMRS added by the network device for this time unit is 2. The index value is "111", indicating that the number of DMRS added by the network device for this time unit is 3.

[0145] 7. When the DCI signaling does not include the redundant state of CDM and the first field, the DCI signaling is used to indicate that the number of DMRS is determined by a predefined configuration method.

[0146] Optionally, the predefined configuration method can be the traditional DMRS configuration method. The network device can configure the number of DMRS through the value of the relevant field in the DMRS pattern, and send it to the terminal device through RRC signaling. For example, dmrs-type is configured as type2, maxLength is configured as single, and additionalPosition is configured as Pos1, that is, the preconfigured DMRS has 3 CDM groups, and two DMRS are configured for the first time unit, namely, a Front-loaded DMRS and an AdditionalDMRS. The Front-loaded DMRS occupies one time domain symbol, and the AdditionalDMRS occupies one time domain symbol. In other words, the total number of time domain symbols occupied by DMRS in the first time unit is 2.

[0147] Optionally, the predefined configuration mode may be obtained through negotiation between the network device and the terminal device.

[0148] In one implementation, the network device can dynamically configure the DMRS of multiple time units, that is, the DCI signaling sent by the network device to the terminal device includes a DMRS pattern configured for N time units, and the DMRS pattern is used to indicate the number of DMRS in each time unit, N>1, and N is a positive integer.

[0149] In a specific implementation, the network device may add a dmrsChange field in the DCI signaling, which includes a first index value, and the first index value corresponds to N time units and the number of DMRS in each time unit. For example, the network device may determine the first index value corresponding to the DMRS configuration information based on the DMRS configuration information and a predefined mapping relationship. After receiving the DCI signaling, the terminal device may determine the DMRS configuration information based on the first index value and the mapping relationship, for example, configuring 1 DMRS for each slot contained in the N time units.

[0150] Table 7: Index value used to indicate the number of DMRS configured for N time units

[0151] Index value N DMRS pattern 000 1 1 DMRS per slot 001 1 2 DMRS per slot 010 5 The first slot has 2 DMRS 011 10 The first slot has 4 DMRS 100 10 2 DMRS per 5 slots 101 15 The first slot has 4 DMRS 110 15 3 DMRS per 7 slots 111 20 3 DMRS per 10 slots

[0152] In Table 7, assuming that maxLength is configured as single, the index value is "000", which means that the network device configures DMRS for 1 time unit, wherein the network device configures 1 DMRS for each time slot included in the time unit. The index value is "001", which means that the network device configures DMRS for 1 time unit, wherein the network device configures 2 DMRS for each slot included in the time unit. The index value is "010", which means that the network device configures DMRS for 5 time units, wherein the network device configures 2 DMRS for the first slot included in the 5 time units, and the remaining 4 slots are not configured with DMRS. The index value is "011", which means that the network device configures DMRS for 10 time units, wherein the network device configures 4 DMRS for the first slot included in the 10 time units, and the remaining 9 slots are not configured with DMRS. The index value is "100", which means that the network device configures DMRS for 10 time units, wherein the network device configures 2 DMRS for every 5 slots included in the 10 time units, and so on.

[0153] Taking TTI as an example, one time unit may include L slots, where L is a positive integer. In LTE, L=2, that is, two slots are scheduled for each transmission.

[0154] Table 8: Index value used to indicate the number of DMRS configured for N time units

[0155] Index value N DMRS pattern 000 1 1 DMRS per slot 001 1 2 DMRS per slot 010 5 The first slot has 2 DMRS 011 5 1 DMRS per slot 100 5 1 DMRS per 2 slots 101 10 The first slot has 3 DMRS 110 10 1 DMRS per slot 111 10 1 DMRS for every 5 slots

[0156] In Table 8, assuming that maxLength is configured as single, the index value is "000", which means that the network device configures DMRS for 1 time unit, wherein the network device configures 1 DMRS for each slot included in the time unit. The index value is "001", which means that the network device configures DMRS for 1 time unit, wherein the network device configures 2 DMRS for each slot included in the time unit. The index value is "010", which means that the network device configures DMRS for 5 time units, wherein the network device configures 2 DMRS for the first slot included in the 5 time units, and the remaining 4 slots are not configured with DMRS. The index value is "011", which means that the network device configures DMRS for 5 time units, wherein the network device configures 1 DMRS for each slot included in the 5 time units. The index value is "100", which means that the network device configures DMRS for 5 time units, wherein the network device configures 1 DMRS for every 2 slots included in the 5 time units, and so on.

[0157] Any table in the embodiments of the present application may be predefined by the network device, or may be obtained by the network device through high-level signaling configuration.

[0158] Step S402: The terminal device receives data in N time units based on the total number of time domain symbols occupied by DMRS in each time unit and scheduling information, or the terminal device maps the DMRS pilot to the data channel and sends the data channel based on the total number of time domain symbols occupied by DMRS in each time unit and scheduling information. Correspondingly, the network device maps the DMRS pilot to the data channel and sends the data channel based on the total number of time domain symbols occupied by DMRS in each time unit and scheduling information, or the network device receives data carried by the data channel where the DMRS pilot is located in N time units based on the total number of time domain symbols occupied by DMRS in each time unit and scheduling information.

[0159] When the scheduling information is used to indicate configuration information such as the time-frequency resource location or modulation mode of uplink data transmission, the terminal device can send data in N time units based on the total number of time domain symbols occupied by DMRS in each time unit and the scheduling information. For example, the terminal device sends data to the network device in N time units based on the total number of time domain symbols occupied by DMRS in each time unit and the scheduling information, and the network device can receive data from the terminal device in N time units based on the total number of time domain symbols occupied by DMRS in each time unit and the scheduling information.

[0160] When the scheduling information is used to indicate configuration information such as the time-frequency resource location or modulation mode of downlink data transmission, the terminal device can receive data in N time units based on the total number of time domain symbols occupied by DMRS in each time unit and the scheduling information. For example, the network device can send data to the terminal device in N time units based on the total number of time domain symbols occupied by DMRS in each time unit and the scheduling information, and the terminal device receives data from the network device in N time units based on the total number of time domain symbols occupied by DMRS in each time unit and the scheduling information.

[0161] exist Figure 4 In the described method, the network device sends DCI signaling to the terminal device through PDCCH, the DCI signaling indicates the scheduling information of N time units, and the DCI signaling includes DMRS patterns configured for N time units, the DMRS pattern is used to indicate the number of DMRS in each time unit, and the terminal device receives or sends data in N time units based on the total number of time domain symbols occupied by DMRS in each time unit and the scheduling information, and can adapt to the channel characteristics in real time. For example, when the channel quality is poor, the network device configures a larger number of DMRS to improve the channel estimation and data correct demodulation performance; when the channel quality is good, the network device configures a smaller number of DMRS, which can reduce the DMRS pilot overhead to achieve flexible and dynamic configuration of DMRS. In addition, RRC signaling also includes many processes such as connection management, radio bearer control and connection mobility. It takes a long time for RRC signaling to be transmitted to the terminal device, and it is difficult to configure the DMRS pattern in a short time. The embodiment of the present application indicates the DMRS pattern configured for at least one time unit through DCI signaling, and can configure the DMRS pattern in a short time to improve spectrum efficiency.

[0162] based on Figure 1 For the image processing method shown, see Figure 5 , Figure 5 Another DMRS configuration method provided in an embodiment of the present application includes but is not limited to the following steps:

[0163] Step S501: The network device sends the RRC signaling carried on the PDSCH to the terminal device, and the terminal device receives the RRC signaling. The RRC signaling includes a DMRS pattern configured for N time units, the DMRS pattern is used to indicate the number of DMRS in each time unit, and the total number of time domain symbols occupied by the DMRS configured in at least two time units of the N time units is different, and N is a positive integer greater than 1.

[0164] The RRC signaling may also indicate the DMRS configuration information of N time units, and the DMRS configuration information may be used to indicate the value of the number N of the N time units, or the DMRS configuration type DMRS-Type of the N time units (optionally, DMRS-type may take the value type1 or type2, see Table 1), or the maximum number of time domain symbols that each preceding / additional DMRS of the N time units may occupy Maxlength (optionally, maxlength may take the value 1 or 2, see Table 1), etc.

[0165] In a specific implementation, the network device may jointly configure the DMRS of multiple time units. The network device may jointly configure the DMRS of multiple time units in the following four ways:

[0166] 1. In the DMRS pattern configured for N time units included in the RRC signaling, the number of DMRS configured for the first k time units in the N time units is greater than the number of DMRS configured for other time units except the first k time units, k is a positive integer, and 1<=k<N. Among them, the number of DMRS configured on each time unit in the first k time units can be the same or different. Similarly, the number of DMRS configured on each time unit in other time units can be the same or different.

[0167] This method can also be called a configuration method of dense at the front and sparse at the back, that is, the density of the DMRS configured in the front time unit among the N time units is higher than the density of the DMRS configured in the back time unit.

[0168] Taking k=1 as an example, in the DMRS pattern configured for N time units included in the RRC signaling, the number of DMRS configured for the first time unit among the N time units is greater than the number of DMRS configured for other time units among the N time units except the first time unit.

[0169] In a specific implementation, the network device configures a larger number of DMRSs for the first time unit among the N time units, and configures a smaller number of DMRSs for the second to Nth time units.

[0170] by Figure 6Taking the schematic diagram of the DMRS pattern shown as an example, assuming that N=K1, the network device configures two DMRSs for the first time unit of the K1 time units, including a Front-loaded DMRS and an AdditionalDMRS, wherein the Front-loaded DMRS occupies one time domain symbol, and the AdditionalDMRS occupies one time domain symbol. The network device configures one DMRS for each time unit from the second to the K1th time unit of the K1 time units, namely, the Front-loaded DMRS, wherein the Front-loaded DMRS occupies one time domain symbol.

[0171] 2. In the DMRS pattern configured for N time units included in the RRC signaling, the number of DMRS configured for the first k time units and the number of DMRS configured for the last m time units in the N time units are both greater than the number of DMRS configured for other time units in the N time units except the first k time units and the last m time units, k is a positive integer, and 1<=k<Nm, 1<=m<Nk. Among them, the number of DMRS configured on each time unit in the first k time units can be the same or different. The number of DMRS configured on each time unit in the last m time units can be the same or different. Similarly, the number of DMRS configured on each time unit in other time units can be the same or different. Moreover, the number of DMRS configured on each time unit in the first k time units and the last m time units can be the same or different.

[0172] This method can also be called a configuration method of dense front and back and sparse middle, that is, the density of DMRS configured in the front and back time units of N time units is higher than the density of DMRS configured in the middle time unit.

[0173] Taking k=1, m=1 as an example, RRC signaling is used to indicate the DMRS pattern configured for each of the N time units, the number of DMRS configured for the first time unit in the N time units is greater than the number of DMRS configured for the 2nd to N-1st time units in the N time units, and the number of DMRS configured for the Nth time unit in the N time units is greater than the number of DMRS configured for the 2nd to N-1st time units in the multiple time units. The number of DMRS configured for the first time unit in the N time units and the number of DMRS configured for the Nth time unit in the N time units are independent of each other, and the embodiment of the present application does not limit the relationship between the number of DMRS configured for the first time unit in the N time units and the number of DMRS configured for the Nth time unit in the N time units.

[0174] In a specific implementation, the network device configures a larger number of DMRSs for the first time unit and the Nth time unit among the N time units, and configures a smaller number of DMRSs for the second to the N-1th time units.

[0175] by Figure 7 Taking the schematic diagram of the DMRS pattern shown as an example, assuming that N=K2, the network device configures two DMRSs for the first time unit of the K2 time units, including a Front-loaded DMRS and an AdditionalDMRS, wherein the Front-loaded DMRS occupies one time domain symbol, and the AdditionalDMRS occupies one time domain symbol. The network device configures a DMRS, namely, a Front-loaded DMRS, for each time unit from the second to the K2-1th time unit of the K2 time units, wherein the Front-loaded DMRS occupies one time domain symbol. The network device configures two DMRSs for the K2th time unit of the K2 time units, including a Front-loaded DMRS and an AdditionalDMRS, wherein the Front-loaded DMRS occupies one time domain symbol, and the AdditionalDMRS occupies one time domain symbol.

[0176] 3. In the DMRS pattern configured for N time units included in the RRC signaling, the number of DMRS configured for each time unit in the first time unit set in the N time units is the same, the first time unit set includes at least one time unit in the N time units, and the at least one time unit is a time unit that is L time units apart from the 10th time unit, 10 is a positive integer, 1<=10<=N, and the other time units in the N time units except the first time unit set are not configured with DMRS or the number of configured DMRS is less than the number of DMRS configured for each time unit in the first time unit set. This method is also called interval configuration of DMRS.

[0177] Among them, at least one time unit can be the l0+L*ith time unit among N time units, L is the time unit interval, L and i are positive integers, and 1≤L<N, the value of i is 0, 1,...max, max is the maximum positive integer that makes L*i less than N.

[0178] Taking l0=1, L=N-1 as an example, the RRC signaling is used to indicate the number of DMRS configured for the first time unit among N time units, and no DMRS is configured for other time units among the N time units except the first time unit.

[0179] by Figure 8Taking the schematic diagram of the DMRS pattern shown as an example, assuming that N=K1, the network device configures the number of DMRS for the first time unit of K1 time units, the number of DMRS is two, including a Front-loaded DMRS and an AdditionalDMRS, wherein the Front-loaded DMRS occupies one time domain symbol, and the AdditionalDMRS occupies one time domain symbol, and the network device does not configure DMRS for the second time unit to the K1th time unit of the K1 time units. Assuming that N=K2, the network device configures the number of DMRS for the first time unit of K2 time units, the number of DMRS is two, including a Front-loaded DMRS and an AdditionalDMRS, wherein the Front-loaded DMRS occupies one time domain symbol, and the AdditionalDMRS occupies one time domain symbol, and the network device does not configure DMRS for the second time unit to the K2th time unit of the K2 time units. K1 and K2 may be the same or different.

[0180] Among them, for different time units, the value of N can be fixed or dynamically changed. Taking the fixed value of N as an example, the network device can configure the number of DMRS every N-1 time units, the number of DMRS configured in each time unit is the same, and the other time units are not configured with DMRS. Exemplarily, assuming that N=5, the network device configures two DMRS every 4 time units, then two DMRS are configured in the first time unit, the second to fifth time units are not configured with DMRS, the sixth time unit is configured with two DMRS, and the seventh to tenth time units are not configured with DMRS. Taking the dynamic change of the value of N as an example, the network device can configure the number of DMRS for K1 time units among K1+K2 time units, the first time unit in the K1 time unit is configured with the number of DMRS, and the other time units are not configured with DMRS. The network device can configure the number of DMRS for K2 time units among K1+K2 time units, the first time unit in the K2 time units is configured with the number of DMRS, and the other time units are not configured with DMRS. Exemplarily, assuming K1+K2=12, K1=5, K2=7, the network device can configure the number of DMRS for the first time unit and the number of DMRS for the sixth time unit, wherein the second to fifth time units are not configured with DMRS, and the seventh to twelfth time units are not configured with DMRS.

[0181] For another example, the network device configures the number of DMRSs every L time units starting from the 10th time unit in N time units, the number of DMRSs configured in each time unit is the same, and no DMRS is configured in other time units. Exemplarily, assuming that N=5, 10=1, L=1, and the network device configures two DMRSs every 1 time unit, then two DMRSs are configured in the first time unit, two DMRSs are configured in the third time unit, and two DMRSs are configured in the fifth time unit, and no DMRSs are configured in the second time unit and the fourth time unit.

[0182] The above three DMRS configuration modes are unequal DMRS configuration modes and are only used for examples, that is, the number of DMRS configured in different time units may not be completely the same, or may be completely different.

[0183] 4. The DMRS pattern indicates the total number of DMRSs configured for N time units.

[0184] In a specific implementation, the network device may configure the number of time units, that is, the value of N, through RRC signaling. The network device may also configure a DMRS pattern through RRC signaling, and the DMRS pattern indicates the total number of DMRSs configured for the N time units. Based on this, the terminal device may determine the total number of DMRSs configured for the N time units based on the DMRS pattern.

[0185] For example, the network device can configure the total number of DMRSs in each of the N time units. Assume that dmrs-type = type1, maxLength = single, the network device configures 4 DMRSs for the first time unit in the N time units, 2 DMRSs for the second time unit in the N time units, and 1 DMRS for the third time unit in the N time units, that is, the first time unit configures the DMRS AdditionalPosition = pos3, the second time unit configures the DMRS AdditionalPosition = pos1, and the third time unit configures the DMRS AdditionalPosition = pos0. Therefore, the RRC signaling directly configures AdditionalPosition = {pos3, pos1, pos0}, which corresponds to the number of additional DMRSs in the three time units respectively.

[0186] For another example, the network device adds a type indication field MultiTTiDMRSType in the RRC signaling, and the optional values ​​of this field are periodic, unequal1 or unequal2. When the value of this field is periodic, it means that in the DMRS pattern configured for N time units included in the RRC signaling, the number of DMRS configured for each time unit in the first time unit set of the N time units is the same, and the other time units except the first time unit set of the N time units are not configured with DMRS or the number of configured DMRS is less than the number of DMRS configured for each time unit in the first time unit set. When the value of this field is unequal1, it means that in the DMRS pattern configured for N time units included in the RRC signaling, the number of DMRS configured for the first k time units in the N time units is greater than the number of DMRS configured for other time units except the first k time units. When the value of this field is unequal2, it indicates that in the DMRS pattern configured for N time units included in the RRC signaling, the number of DMRS configured for the first k time units and the number of DMRS configured for the last m time units of the N time units are both greater than the number of DMRS configured for other time units of the N time units except the first k time units and the last m time units.

[0187] For another example, when the value of the MultiTTiDMRSType field is periodic, the network device configures the total number of DMRSs in the first time unit through RRC signaling. Exemplarily, assuming additionalPosition=Pos2, it means that 3 DMRSs are configured for the first time unit.

[0188] For another example, when the value of the MultiTTiDMRSType field is unequal1, the network device configures the total number of DMRS in the first time unit and the total number of DMRS in each time unit from the second to the Nth time unit through RRC signaling. For example, assuming additionalPosition = {Pos2, Pos0}, it means that 3 DMRS are configured for the first time unit and 1 DMRS is configured for each time unit from the second to the Nth time unit.

[0189] For another example, when the value of the Multi time unit DMRSType field is unequal2, the network device configures the total number of DMRS in the first time unit, the total number of DMRS in the Nth time unit, and the total number of DMRS in each time unit from the second to the N-1th time unit through RRC signaling. For example, assuming additionalPosition = {Pos2, Pos1, Pos0}, it means that 3 DMRS are configured for the first time unit, 2 DMRS are configured for the Nth time unit, and 1 DMRS is configured for each time unit from the second to the N-1th time unit.

[0190] Step S502: The terminal device receives data in N time units based on the total number of time domain symbols occupied by DMRS in each time unit and scheduling information, or the terminal device maps the data to the data channel and sends the data based on the total number of time domain symbols occupied by DMRS in each time unit and scheduling information. Correspondingly, the network device maps the data to the data channel and sends the data based on the total number of time domain symbols occupied by DMRS in each time unit and scheduling information, or the network device receives data in N time units based on the total number of time domain symbols occupied by DMRS in each time unit and scheduling information.

[0191] When the scheduling information is used to indicate configuration information such as the time-frequency resource location or modulation mode of uplink data transmission, the terminal device can send data in N time units based on the total number of time domain symbols occupied by DMRS in each time unit and the scheduling information. For example, the terminal device sends data to the network device in N time units based on the total number of time domain symbols occupied by DMRS in each time unit and the scheduling information, and the network device can receive data from the terminal device in N time units based on the total number of time domain symbols occupied by DMRS in each time unit and the scheduling information.

[0192] When the scheduling information is used to indicate configuration information such as the time-frequency resource location or modulation mode of downlink data transmission, the terminal device can receive data in N time units based on the total number of time domain symbols occupied by DMRS in each time unit and the scheduling information. For example, the network device can send data to the terminal device in N time units based on the total number of time domain symbols occupied by DMRS in each time unit and the scheduling information, and the terminal device receives data from the network device in N time units based on the total number of time domain symbols occupied by DMRS in each time unit and the scheduling information.

[0193] exist Figure 5In the described method, a network device sends an RRC signaling to a terminal device, the RRC signaling indicates scheduling information of N time units, and the RRC signaling includes a DMRS pattern configured for the N time units, the DMRS pattern is used to indicate the number of DMRS in each time unit, and the total number of time domain symbols occupied by the DMRS configured in at least two of the N time units is different. The terminal device receives or sends data in the N time units based on the total number of time domain symbols occupied by the DMRS in each time unit and the scheduling information. The embodiment of the present application configures the DMRS patterns of multiple time units through RRC signaling, and the total number of time domain symbols occupied by the DMRS configured in at least two of the multiple time units is different, which can adapt to the characteristics of the current channel. For example, when the channel changes slowly, a periodic DMRS configuration is adopted, and subsequent time units reuse the DMRS channel estimation result of the first time unit, which can not only ensure accurate channel estimation and data demodulation, but also reduce the pilot overhead of the DMRS and improve the spectrum efficiency of the system.

[0194] Figure 4 The DMRS pattern of at least one time unit is configured through DCI signaling. The real-time and flexibility of DMRS configuration are relatively high, but PDCCH needs to be sent frequently and PDCCH needs to be blindly detected frequently, resulting in large PDCCH resource overhead and high complexity of blind detection. Figure 5 The DMRS patterns of multiple time units are configured by RRC signaling, without blind detection of PDCCH, but the real-time and flexibility of configuration are not as good as Figure 4 The embodiment of the present application may provide another DMRS configuration method, which achieves a balance between flexibility and PDCCH resource overhead / blind detection complexity by configuring DMRS of multiple time units through semi-persistent scheduling (SPS), and can flexibly configure by adjusting / updating PDCCH transmission, or not send PDCCH when frequent PDCCH updates are not required, so as to reduce PDCCH blind detection overhead and DMRS pilot overhead.

[0195] Through DCI, multiple scheduling information such as flexible time-frequency resources and modulation methods can be configured in real time for each time unit, but the correct reception of PDCCH requires the terminal to perform complex blind detection, and PDCCH transmission will cause certain time-frequency resource overhead. Therefore, a semi-static scheduling mechanism is introduced in the 5G NR system, that is, PDCCH is no longer sent frequently. Instead, after initially configuring a PDCCH with an SPS identifier, if the DCI carried in the PDCCH does not need to be updated, no new PDCCH is sent, and the terminal device always uses the DMRS pattern indicated by the most recent DCI to receive or send DMRS. When the DCI carried in the PDCCH needs to be updated, the PDCCH with the SPS identifier is sent again. By changing the PDCCH transmission period of the SPS identifier, the 5G NR system can flexibly balance the real-time / flexibility indication of data transmission and the number of PDCCH blind detections / resource overhead issues.

[0196] based on Figure 4 The DMRS configuration method, when the DMRS pattern configured for at least one time unit in the next cycle is updated, sends updated DCI signaling to the terminal device when the next cycle is reached, and the updated DCI signaling is obtained by sps-C-RNTI scrambling.

[0197] In a specific implementation, the network device may be configured as spsConfig through the parameter RadioResourceControlDedicated in the RRC signaling to indicate that the current resource configuration is the SPS configuration.

[0198] After the network device initially sends the PDCCH encrypted with sps-C-RNTI, it will update the PDCCH at a predefined periodic time when it needs to update the DMRS configuration information of multiple time units indicated by the DCI according to a certain period, and send the updated PDCCH obtained by sps-C-RNTI encryption to the terminal device. When it is not necessary to update the DMRS configuration information of multiple time units indicated by the DCI, the network device suspends sending the PDCCH to the terminal device, and the DMRS configuration indication of multiple time units does not change. The PDCCH encrypted with sps-C-RNTI carries the DMRS configuration of multiple time units indicated by the DCI. The indication method of the DCI is the same as Figure 4 The indication mode of the DCI is the same and will not be described again here. The period can be obtained through RRC signaling configuration.

[0199] The sps configuration mode activates / releases SPS resources through the PDCCH scrambled by sps-C-Rnti, that is, the terminal device considers SPS transmission to be activated only when the sps-C-RNTI is correct through CRC verification and the corresponding field in PDCCH meets the value conditions. The corresponding field in PDCCH meets the value conditions, for example, the DNI value is 0.

[0200] SPS is scheduled once and used multiple times. It does not need to configure PDCCH in each time unit like dynamic PDCCH, which causes relatively large control channel resource overhead.

[0201] See also Fig. 9 , Fig. 9 is a schematic diagram of the structure of another communication system provided in an embodiment of the present application, such as Fig. 9 As shown, the communication system includes a network device and a terminal device. The terminal device can perform the relevant functions of the terminal device in the above method, so the same terms and contents can refer to the above description and are not repeated here. Among them, the terminal device includes at least one processing module 901 and a communication module 902. Accordingly, the network device can perform the relevant functions of the network device in the above method, wherein the network device includes at least one processing module 903 and a communication module 904.

[0202] In an exemplary embodiment, the communication module 902 is configured to receive a first signaling, and based on the total number of time domain symbols occupied by the DMRS in each time unit and the scheduling information, receive or send data in the N time units. The first signaling indicates the scheduling information of the N time units, and the first signaling includes a DMRS pattern configured for the N time units, the DMRS pattern is used to indicate the number of DMRS in each time unit, the number of DMRS in each time unit is the total number of time domain symbols occupied by the DMRS in each time unit, the total number of time domain symbols occupied by the DMRS configured in at least two of the N time units is different, and N is a positive integer greater than 1.

[0203] Optionally, the first signaling may be RRC signaling.

[0204] In one possible implementation, in the DMRS pattern configured for N time units included in the RRC signaling, the number of DMRS configured for the first k time units among the N time units is greater than the number of DMRS configured for other time units except the first k time units, k is a positive integer, and 1<=k<N.

[0205] In a possible implementation, in the DMRS pattern configured for N time units included in the RRC signaling, the number of DMRS configured for the first k time units and the number of DMRS configured for the last m time units among the N time units are both greater than the number of DMRS configured for other time units among the N time units except the first k time units and the last m time units, k is a positive integer, and 1<=k<Nm, 1<=m<Nk.

[0206] In a possible implementation, in the DMRS pattern configured for N time units included in the RRC signaling, the number of DMRS configured for each time unit in a first time unit set among the N time units is the same, the first time unit set includes at least one time unit among the N time units, the at least one time unit is a time unit that is spaced L time units apart from the l0th time unit, l0 is a positive integer, 1<=l0<=N, and the other time units among the N time units except the first time unit set are not configured with DMRS or the number of configured DMRS is less than the number of DMRS configured for each time unit in the first time unit set.

[0207] In a possible implementation manner, the DMRS pattern indicates the total number of DMRSs respectively configured for the N time units; the total number of DMRSs is the total number of pre-DMRSs and additional DMRSs.

[0208] After the communication module 902 receives the first signaling, the processing module 901 may determine the total number of DMRSs respectively configured for the N time units based on the DMRS pattern.

[0209] Optionally, the first signaling may be DCI signaling.

[0210] In a possible implementation manner, the DCI signaling includes a first index value, where the first index value corresponds to the N time units and the number of DMRSs in each time unit;

[0211] After the communication module 902 receives the first signaling, the processing module 901 may determine the number of DMRSs configured for each of the N time units based on the first index value.

[0212] In a possible implementation manner, the DCI signaling is scrambled by sps-C-RNTI.

[0213] In a possible implementation manner, the total number of time domain symbols occupied by the DMRS in each time unit is the total number of time domain symbols occupied by the pre-DMRS and the additional DMRS in each time unit.

[0214] It can be understood that the specific implementation of each functional unit included in the terminal device can be referred to the aforementioned embodiments, which will not be repeated here.

[0215] like Fig. 9 As shown, the network device includes a communication module 904 and a processing module 903, wherein:

[0216] The communication module 904 is used to send a first signaling to a terminal device, and based on the total number of time domain symbols occupied by the DMRS in each time unit and the scheduling information, receive or send data in the N time units. The first signaling indicates the scheduling information of the N time units, and the first signaling includes a DMRS pattern configured for the N time units, the DMRS pattern is used to indicate the number of DMRS in each time unit, the number of DMRS in each time unit is the total number of time domain symbols occupied by the DMRS in each time unit, the total number of time domain symbols occupied by the DMRS configured in at least two of the N time units is different, and N is a positive integer greater than 1.

[0217] Optionally, the first signaling is RRC signaling.

[0218] In one possible implementation, in the DMRS pattern configured for N time units included in the RRC signaling, the number of DMRS configured for the first k time units among the N time units is greater than the number of DMRS configured for other time units except the first k time units, k is a positive integer, and 1<=k<N.

[0219] In a possible implementation, in the DMRS pattern configured for N time units included in the RRC signaling, the number of DMRS configured for the first k time units and the number of DMRS configured for the last m time units among the N time units are both greater than the number of DMRS configured for other time units among the N time units except the first k time units and the last m time units, k is a positive integer, and 1<=k<Nm, 1<=m<Nk.

[0220] In a possible implementation, in the DMRS pattern configured for N time units included in the RRC signaling, the number of DMRS configured for each time unit in a first time unit set among the N time units is the same, the first time unit set includes at least one time unit among the N time units, the at least one time unit is a time unit that is spaced L time units apart from the l0th time unit, l0 is a positive integer, 1<=l0<=N, and the other time units among the N time units except the first time unit set are not configured with DMRS or the number of configured DMRS is less than the number of DMRS configured for each time unit in the first time unit set.

[0221] In a possible implementation manner, the DMRS pattern indicates the total number of DMRSs respectively configured for the N time units. The total number of DMRSs is the total number of pre-DMRSs and additional DMRSs.

[0222] Optionally, the first signaling is DCI signaling.

[0223] In a possible implementation manner, the DCI signaling includes a first index value, where the first index value corresponds to the N time units and the number of DMRSs in each time unit.

[0224] In a possible implementation manner, the DCI signaling is scrambled by sps-C-RNTI.

[0225] In a possible implementation manner, the total number of time domain symbols occupied by the DMRS in each time unit is the total number of time domain symbols occupied by the pre-DMRS and the additional DMRS in each time unit.

[0226] It can be understood that the specific implementation of each functional unit included in the network device can be referred to the aforementioned embodiments, which will not be repeated here.

[0227] The division of modules in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present application may be integrated into a processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0228] See also Fig.10 , Fig.10 is a schematic diagram of the structure of another communication system provided in an embodiment of the present application, such as Fig.10As shown, the communication system includes a network device and a terminal device. The terminal device can perform the relevant functions of the terminal device in the above method, wherein the terminal device includes at least one processing module 1001 and a communication module 1002. Correspondingly, the network device can perform the relevant functions of the network device in the above method, wherein the network device includes at least one processing module 1003 and a communication module 1004.

[0229] In an exemplary embodiment, the communication module 1002 is configured to receive DCI, and based on the total number of time domain symbols occupied by DMRS in the first time unit and the scheduling information, receive or send data in the first time unit. The DCI indicates the scheduling information of the first time unit, and the DCI includes a DMRS pattern configured for the first time unit, the DMRS pattern is used to indicate the number of DMRS in the first time unit, and the number of DMRS in the first time unit is the total number of time domain symbols occupied by DMRS in the first time unit;

[0230] In a possible implementation manner, the DCI includes a first field, where the first field includes a total number of DMRSs configured for the first time unit, or the first field includes an index value, where the index value indicates the total number of DMRSs configured for the first time unit;

[0231] After the communication module 1002 receives the DCI, the processing module 1001 may determine the total number of DMRSs configured for the first time unit based on the first field.

[0232] In a possible implementation manner, the DCI includes a first field, the first field includes the number of DMRSs added or deleted for the first time unit, or the first field includes an index value, the index value indicates the number of DMRSs added or deleted for the first time unit;

[0233] After the communication module 1002 receives the DCI, the processing module 1001 may determine the total number of DMRS configured for the first time unit based on the first field and the total number of pre-configured DMRS, where the total number of DMRS is the total number of pre-DMRS and additional DMRS.

[0234] In a possible implementation manner, the total number of time domain symbols occupied by the DMRS configured for the first time unit indicated by the DCI is 0.

[0235] In a possible implementation manner, the DCI indicates through a redundant state of CDM that the total number of time domain symbols occupied by the DMRS configured for the first time unit is 0.

[0236] In a possible implementation manner, the communication module 1002 receives data in the first time unit based on the total number of time domain symbols occupied by the DMRS in the first time unit and the scheduling information, including:

[0237] The processing module 1001 demodulates the data received in the first time unit based on the scheduling information and the DMRS in the second time unit, wherein the second time unit is before the first time unit.

[0238] In a possible implementation manner, the DCI is scrambled by sps-C-RNTI.

[0239] It can be understood that the specific implementation of each functional unit included in the terminal device can be referred to the aforementioned embodiments, which will not be repeated here.

[0240] like Fig.10 As shown, the network device includes a communication module 1004 and a processing module 1003, wherein:

[0241] The communication module 1004 is configured to send a DCI to a terminal device, and receive or send data in the first time unit based on the total number of time domain symbols occupied by the DMRS in the first time unit and the scheduling information. The DCI indicates the scheduling information of the first time unit, and the DCI includes a DMRS pattern configured for the first time unit, the DMRS pattern is used to indicate the number of DMRSs in the first time unit, and the number of DMRSs in the first time unit is the total number of time domain symbols occupied by the DMRS in the first time unit;

[0242] In a possible implementation, the DCI includes a first field, the first field includes the total number of DMRS configured for the first time unit, or the first field includes an index value, the index value indicates the total number of DMRS configured for the first time unit.

[0243] In one possible implementation, the DCI includes a first field, the first field includes the number of DMRS added or deleted for the first time unit, or the first field includes an index value, the index value indicates the number of DMRS added or deleted for the first time unit, and the total number of DMRS configured for the first time unit is determined based on the first field and the total number of pre-configured DMRS, and the total number of DMRS is the total number of leading DMRS and additional DMRS.

[0244] In a possible implementation manner, the total number of time domain symbols occupied by the DMRS configured for the first time unit indicated by the DCI is 0.

[0245] In a possible implementation manner, the DCI indicates through a redundant state of CDM that the total number of time domain symbols occupied by the DMRS configured for the first time unit is 0.

[0246] In a possible implementation manner, the communication module 1004 receives data in the first time unit based on the total number of time domain symbols occupied by the DMRS in the first time unit and the scheduling information, including:

[0247] The processing module 1003 demodulates the data received in the first time unit based on the scheduling information and the DMRS in the second time unit, wherein the second time unit is before the first time unit.

[0248] In a possible implementation manner, the DCI is scrambled by sps-C-RNTI.

[0249] It can be understood that the specific implementation of each functional unit included in the network device can be referred to the aforementioned embodiments, which will not be repeated here.

[0250] The division of modules in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present application may be integrated into a processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0251] See also Fig.11 , Fig.11 The device 1100 provided in an embodiment of the present application is shown, which is used to implement the function of the network device or the function of the terminal device in the above method. The device can be a network device or a device in a network device. Or the device can be a terminal device or a device in a terminal device. Among them, the device can be a chip system. In the embodiment of the present application, the chip system can be composed of chips, or it can include chips and other discrete devices. The device 1100 includes at least one processor 1120, which is used to implement the function of the network device or the function of the terminal device in the method provided in an embodiment of the present application. Exemplarily, the processor 1120 determines the total number of DMRSs configured for N time units based on the DMRS pattern. For details, please refer to the detailed description in the method example, which will not be repeated here.

[0252] The device 1100 may also include at least one memory 1130 for storing program instructions and / or data. The memory 1130 is coupled to the processor 1120. The coupling in the embodiment of the present application is an indirect coupling or communication connection between devices, units or modules, which may be electrical, mechanical or other forms, and is used for information exchange between devices, units or modules. The processor 1120 may operate in conjunction with the memory 1130. The processor 1120 may execute program instructions stored in the memory 1130. At least one of the at least one memory may be included in the processor.

[0253] The apparatus 1100 may also include a communication interface 1110 for communicating with other devices via a transmission medium, so that the apparatus in the apparatus 1100 can communicate with other devices. Exemplarily, the other device may be a terminal device or a network device. Exemplarily, the communication interface may be a transceiver, a circuit, a bus, a module, or other types of communication interfaces. The processor 1120 uses the communication interface 1110 to send and receive data, and is used to implement Figure 4 or Figure 5 The method executed by the network device described in the corresponding embodiment, or used to implement Figure 4 or Figure 5 The method executed by the terminal device described in the corresponding embodiment.

[0254] The specific connection medium between the communication interface 1110, the processor 1120 and the memory 1130 is not limited in the embodiment of the present application. Fig.11 The memory 1130, the processor 1120 and the communication interface 1110 are connected via a bus 1140. Fig.11 The connections between the other components are shown in bold lines, which are only for illustration and are not intended to be limiting. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.11 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0255] In the embodiments of the present application, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0256] In the embodiment of the present application, the memory may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., or a volatile memory (volatile memory), such as a random access memory (RAM). The memory is any other medium that can be used to carry or store a desired program code in the form of an instruction or data structure and can be accessed by a computer, but is not limited thereto. The memory in the embodiment of the present application may also be a circuit or any other device that can implement a storage function, for storing program instructions and / or data.

[0257] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state hard disk SolidState Disk (SSD)), etc.

Claims

1. A method for acquiring configuration information of a modulation and demodulation reference signal (DMRS), characterized in that: include: Receive a first signaling, wherein the first signaling includes a modulation and demodulation reference signal DMRS pattern configured for N time units, the DMRS pattern is used to indicate the number of DMRSs in each time unit, the number of DMRSs in each time unit is the total number of time domain symbols occupied by the DMRSs in each time unit, the total number of time domain symbols occupied by the DMRSs configured in at least two of the N time units is different, and N is a positive integer greater than 1; the DMRS pattern indicates the total number of DMRSs configured for the N time units, respectively, and the total number of DMRSs is the total number of pre-DMRSs and additional DMRSs; Based on the DMRS pattern, determine the total number of DMRSs configured for the N time units respectively; Based on the total number of time domain symbols occupied by the DMRS in each time unit, data is received or sent in the N time units; wherein the time unit is a transmission time interval TTI.

2. The method according to claim 1, characterized in that The first signaling is radio resource control RRC signaling.

3. The method according to claim 2, characterized in that In the DMRS pattern configured for the N time units included in the RRC signaling, the number of DMRS configured for the first k time units of the N time units is greater than the number of DMRS configured for other time units except the first k time units, k is a positive integer, and 1<=k <N。 4. The method according to claim 2, characterized in that: In the DMRS pattern configured for the N time units included in the RRC signaling, the number of DMRS configured for the first k time units and the number of DMRS configured for the last m time units in the N time units are both greater than the number of DMRS configured for other time units in the N time units except the first k time units and the last m time units, k is a positive integer, and 1<=k <N-m,1<=m<N-k。 5. The method according to claim 2, characterized in that: In the DMRS pattern configured for N time units included in the RRC signaling, the number of DMRS configured for each time unit in a first time unit set among the N time units is the same, the first time unit set includes at least one time unit among the N time units, the at least one time unit is a time unit that is spaced L time units apart from the l0th time unit, l0 is a positive integer, 1<=l0<=N, and the other time units among the N time units except the first time unit set are not configured with DMRS or the number of configured DMRS is less than the number of DMRS configured for each time unit in the first time unit set.

6. A method for acquiring configuration information of a modulation and demodulation reference signal (DMRS), characterized in that: include: Receive downlink control information DCI, wherein the DCI indicates scheduling information of N time units, the N time units include a first time unit, and the DCI includes a modulation and demodulation reference signal DMRS pattern configured for the first time unit, the DMRS pattern is used to indicate the number of DMRSs in the first time unit, and the number of DMRSs in the first time unit is the total number of time domain symbols occupied by the DMRSs in the first time unit; The DCI includes a first field, the first field includes the number of DMRSs added or deleted for the first time unit, or the first field includes an index value, the index value indicates the number of DMRSs added or deleted for the first time unit; based on the first field and the total number of preconfigured DMRSs, determining the total number of DMRSs configured for the first time unit, the total number of DMRSs is the total number of pre-DMRSs and additional DMRSs; the number of DMRSs added or deleted is the number of DMRSs added or deleted relative to the total number of preconfigured DMRSs; Based on the total number of time domain symbols occupied by the DMRS in the first time unit and the scheduling information, data is received or sent in the first time unit.

7. The method according to claim 6, characterized in that The total number of time domain symbols occupied by the DMRS configured for the first time unit indicated by the DCI is 0.

8. The method according to claim 7, characterized in that The DCI indicates through a redundant state of code division multiplexing CDM that the total number of time domain symbols occupied by the DMRS configured for the first time unit is 0.

9. The method according to claim 6, characterized in that The receiving data in the first time unit based on the total number of time domain symbols occupied by the DMRS in the first time unit and the scheduling information includes: The data received in the first time unit is demodulated based on the scheduling information and the DMRS in the second time unit, wherein the second time unit is before the first time unit.

10. The method according to any one of claims 6 to 9, characterized in that: The DCI is scrambled by a semi-static cell radio network temporary identifier sps-C-RNTI.

11. A method for configuring a modulation and demodulation reference signal (DMRS), characterized in that: include: Sending a first signaling to a terminal device, wherein the first signaling includes a modulation and demodulation reference signal DMRS pattern configured for N time units, the DMRS pattern is used to indicate the number of DMRSs in each time unit, the number of DMRSs in each time unit is the total number of time domain symbols occupied by the DMRSs in each time unit, the total number of time domain symbols occupied by the DMRSs configured in at least two of the N time units is different, and N is a positive integer greater than 1; the DMRS pattern indicates the total number of DMRSs configured for the N time units, respectively, and the total number of DMRSs is the total number of pre-DMRSs and additional DMRSs; Based on the total number of time domain symbols occupied by the DMRS in each time unit, data is received or sent in the N time units; wherein the time unit is a TTI.

12. The method according to claim 11, characterized in that The first signaling is radio resource control RRC signaling.

13. The method according to claim 12, characterized in that In the DMRS pattern configured for the N time units included in the RRC signaling, the number of DMRS configured for the first k time units of the N time units is greater than the number of DMRS configured for other time units except the first k time units, k is a positive integer, and 1<=k <N。 14. The method according to claim 12, characterized in that In the DMRS pattern configured for the N time units included in the RRC signaling, the number of DMRS configured for the first k time units and the number of DMRS configured for the last m time units in the N time units are both greater than the number of DMRS configured for other time units in the N time units except the first k time units and the last m time units, k is a positive integer, and 1<=k <N-m,1<=m<N-k。 15. The method according to claim 12, characterized in that In the DMRS pattern configured for N time units included in the RRC signaling, the number of DMRS configured for each time unit in a first time unit set among the N time units is the same, the first time unit set includes at least one time unit among the N time units, the at least one time unit is a time unit that is spaced L time units apart from the l0th time unit, l0 is a positive integer, 1<=l0<=N, and the other time units among the N time units except the first time unit set are not configured with DMRS or the number of configured DMRS is less than the number of DMRS configured for each time unit in the first time unit set.

16. A method for configuring a modulation and demodulation reference signal (DMRS), characterized in that: include: Sending downlink control information DCI to a terminal device, wherein the DCI indicates scheduling information of N time units, the N time units include a first time unit, and the DCI includes a modulation and demodulation reference signal DMRS pattern configured for the first time unit, the DMRS pattern is used to indicate the number of DMRSs in the first time unit, and the number of DMRSs in the first time unit is the total number of time domain symbols occupied by the DMRS in the first time unit; The DCI includes a first field, the first field includes the number of DMRSs added or deleted for the first time unit, or the first field includes an index value, the index value indicates the number of DMRSs added or deleted for the first time unit; based on the first field and the total number of preconfigured DMRSs, determining the total number of DMRSs configured for the first time unit, the total number of DMRSs is the total number of pre-DMRSs and additional DMRSs; the number of DMRSs added or deleted is the number of DMRSs added or deleted relative to the total number of preconfigured DMRSs; Based on the total number of time domain symbols occupied by the DMRS in the first time unit and the scheduling information, data is received or sent in the first time unit.

17. The method according to claim 16, characterized in that The total number of time domain symbols occupied by the DMRS configured for the first time unit indicated by the DCI is 0.

18. The method according to claim 17, characterized in that The DCI indicates through a redundant state of code division multiplexing CDM that the total number of time domain symbols occupied by the DMRS configured for the first time unit is 0.

19. The method according to claim 16, characterized in that The receiving data in the first time unit based on the total number of time domain symbols occupied by the DMRS in the first time unit and the scheduling information includes: The data received in the first time unit is demodulated based on the scheduling information and the DMRS in the second time unit, wherein the second time unit is before the first time unit.

20. The method according to any one of claims 16 to 19, characterized in that: The DCI is scrambled by a semi-static cell radio network temporary identifier sps-C-RNTI.

21. A communication device, characterized in that: It includes a communication module and a processing module, and the communication module and the processing module are used to implement the method as described in any one of claims 1 to 5; or to implement the method as described in any one of claims 6 to 10; or to implement the method as described in any one of claims 11 to 15; or to implement the method as described in any one of claims 16 to 20.

22. A communication device, characterized in that: The method comprises a processor and a memory, wherein the memory is coupled to the processor, and the processor is used to execute the method according to any one of claims 1 to 5; or to execute the method according to any one of claims 6 to 10; or to execute the method according to any one of claims 11 to 15; or to execute the method according to any one of claims 16 to 20.

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