WO2022056885A1

WO2022056885A1 - Communication method and apparatus

Info

Publication number: WO2022056885A1
Application number: PCT/CN2020/116329
Authority: WO
Inventors: 余雅威; 余健; 郭志恒
Original assignee: 华为技术有限公司
Priority date: 2020-09-19
Filing date: 2020-09-19
Publication date: 2022-03-24
Also published as: CN116097609A; WO2022057175A1

Abstract

Provided by the present application are a communication method and apparatus. The communication method comprises: a network device transmits instruction information to a terminal device, the instruction information instructing the terminal device to configure a first demodulation reference signal (DMRS) on a first time unit, and use the same transmission parameters on the first time unit and at least one second time unit for multiple uplink transmissions, wherein using the same transmission parameters satisfies at least one of the following: using the same transmit power; using the same pre-coding; and using the same antenna port. On the basis of receiving multiple uplink transmissions on the first time unit and at least one second time unit, the network device performs joint channel estimation on the multiple uplink transmissions, which improves the accuracy of channel estimation, and further improves the accuracy rate of demodulating and decoding uplink data.

Description

A communication method and device

technical field

The present application relates to the field of wireless communication, and in particular, to the field of uplink transmission between network equipment and mobile terminal equipment in a wireless communication system.

Background technique

In the NR system, the transmission of the Physical Uplink Shared Channel (PUSCH) requires a demodulation reference signal (Demodulation Reference Signal, DMRS). DMRS is a sequence known to both network equipment and terminal equipment. The data carried through the same precoding, antenna and fading channel, etc., therefore, network equipment and terminal equipment can estimate the fading experienced by the data based on DMRS, thereby realizing correct decoding and decoding to the PUSCH data. For each uplink transmission, More DMRS can improve the accuracy of channel estimation. At the same time, the resources for transmitting DMRS cannot be used to transmit data, which will reduce the data transmission rate. Therefore, improving the accuracy of channel estimation and reducing DMRS overhead become conflicting issues. .

SUMMARY OF THE INVENTION

The present invention provides a communication method and device to improve the accuracy of channel estimation.

In a first aspect, the present application provides a communication method, and the execution body of the method may be a terminal device or a chip applied in the terminal device. The following description takes the execution subject being a terminal device as an example. The terminal device receives the first indication information from the network device, where the first indication information is used to instruct the terminal device to configure the first demodulation reference signal DMRS on the first time unit, and the first indication information is also used to instruct the terminal device to configure the first demodulation reference signal DMRS in the first time unit. Multiple uplink transmissions on one time unit and at least one second time unit satisfy at least one of using the same transmit power, using the same precoding, or using the same antenna port. In a possible design, the uplink transmission on the first time unit includes the first DMRS.

In the above-mentioned manner, the terminal equipment configures the first DMRS, and uses the same transmission parameters on the first time unit and at least one second time unit to perform multiple uplink transmissions to the network equipment, and the same transmission parameters ensure that multiple uplink transmissions are performed. The feasibility of joint channel estimation improves the accuracy of channel estimation.

In a possible design, the first time unit and the at least one second time unit are continuous time units in the time domain. In the above manner, the terminal equipment uses the same transmission parameters to perform multiple uplink transmissions in consecutive time units, which ensures the phase continuity of transmission in different time units.

In a possible design, the first DMRS occupies the last M uplink symbols in the uplink symbols of the first time unit, where M is a natural number less than or equal to 4. In the above manner, the first DMRS occupies a later time domain symbol of the uplink symbol of the first time unit, which is closer to subsequent consecutive time units, and can more accurately estimate the channel state information on multiple time units by difference. In an optional manner, the first time unit is a flexible time slot, and at least one time unit is an uplink time slot. In the above manner, in the case that the uplink symbols in the flexible timeslot are insufficient for PUSCH transmission, configuring the first DMRS on the flexible timeslot can effectively utilize the uplink resources of the flexible timeslot and avoid resource waste.

In a possible design, the number of the first DMRS is one or two. In the above-mentioned manner, the configuration of the first DMRS can improve the accuracy of channel estimation while avoiding the first DMRS occupying too many uplink symbols. the problem of excessive overhead.

In a possible design, the first indication information includes a first field, and the first field instructs the terminal device to configure the first DMRS on the first time unit; confirm that the first indication information includes the first field , the multiple uplink transmissions of the terminal device in the first time unit and at least one second time unit satisfy at least one of the following:

use the same transmit power;

use the same precoding;

Use the same antenna port.

In this design, the first indication information explicitly indicates that the first DMRS is configured on the first time unit, and implicitly indicates that the terminal equipment performs multiple uplink transmissions on the first time unit and at least one second time unit. At least one of using the same transmit power, using the same precoding, or using the same antenna port is satisfied. The signaling overhead of the first indication information can be further saved.

In a possible design, when the position of at least one uplink symbol in the uplink symbol configured by the network device for the second DMRS and the uplink symbol configured by the first DMRS is the same, the at least one uplink symbol in the same position corresponds to the first DMRS or one of the second DMRS, wherein the second DMRS includes a preamble DMRS and/or an additional DMRS. In the above manner, when the positions of the uplink symbols configured by the network device for the first DMRS and the second DMRS are the same, the terminal device only configures one of the first DMRS or the second DMRS at the same at least one uplink symbol in the position. .

In a possible design, the first indication information is carried in the downlink control information DCI, or the first indication information is carried in the radio resource control RRC signaling, or the first indication information is carried in the physical downlink shared channel indicating the uplink grant PDSCH.

In a possible design, the first indication information is carried in the downlink control information DCI, and the method further includes: the terminal device receives second indication information from the network device, where the second indication information is used to indicate that the terminal device has the configuration The capability of the first DMRS and the second indication information are carried in the radio resource control RRC signaling. In the above manner, the network device can instruct the terminal device to configure the first DMRS in a semi-static manner, and use the same transmission parameters to perform multiple uplink transmissions in consecutive time units without multiple scheduling, which can save signaling and reduce network costs. Equipment and end equipment overhead.

In a second aspect, the present application provides a communication method, and the execution body of the method may be a network device or a chip applied in the network device. The following description takes the execution subject being a network device as an example. The network device sends first indication information to the terminal device, where the first indication information is used to instruct the terminal device to configure the first demodulation reference signal DMRS on the first time unit, and the first indication information is also used to instruct the terminal device to configure the first demodulation reference signal DMRS in the first time unit. The multiple uplink transmissions on the time unit and the at least one second time unit satisfy at least one of using the same transmit power, using the same precoding, or using the same antenna port. After receiving multiple uplink transmissions from the terminal device in the first time unit and at least one second time unit, the network device demodulates and decodes the multiple uplink transmissions. In the above-mentioned manner, based on that the terminal equipment uses the same transmission parameters for multiple uplink transmissions in the first time unit and at least one second time unit, the network equipment can perform channel estimation based on all the DMRSs in the multiple uplink transmissions, thereby obtaining the result. The channel state information of the above-mentioned multiple uplink transmissions can improve the accuracy of channel estimation, thereby improving the accuracy of demodulation and decoding of uplink data.

In a possible design, the first time unit and the at least one second time unit are continuous time units in the time domain. In the above manner, the network device receives multiple uplink transmissions in continuous time units, and uses the same transmission parameters based on the multiple uplink transmissions, which ensures the phase continuity of transmission in different time units. Therefore, the network device can utilize multiple time units. All DMRSs on the unit perform joint channel estimation to more accurately obtain the channel state information on each time-domain symbol.

In a possible design, the first DMRS occupies the last M uplink symbols in the uplink symbols of the first time unit, where M is a natural number less than or equal to 4. In the above manner, the first DMRS occupies a later time domain symbol in the first time unit, and is closer to subsequent consecutive time units, so that channel state information on multiple time units can be estimated more accurately by the difference.

In a possible design, the first time unit is a flexible time slot, and at least one time unit is an uplink time slot. In the above manner, in the case that the uplink symbols in the flexible timeslot are insufficient for PUSCH transmission, configuring the first DMRS on the flexible timeslot can effectively utilize the uplink resources of the flexible timeslot and avoid resource waste.

In a possible design, the number of the first DMRS is one or two. In the above-mentioned manner, the configuration of the first DMRS can improve the accuracy of channel estimation and avoid excessive overhead caused by occupying too many uplink symbols. big problem.

In a possible design, the first indication information includes a first field, and the first field indicates that the terminal device configures the first DMRS on the first time unit; the first field is also used to indicate the terminal equipment Multiple uplink transmissions performed by the device on the first time unit and at least one second time unit satisfy at least one of the following:

use the same transmit power;

use the same precoding;

Use the same antenna port.

In a possible design, the first indication information is carried in the downlink control information DCI, and the method further includes: sending second indication information to the terminal equipment, where the second indication information is used to indicate that the terminal equipment has the ability to configure the first DMRS capability, the second indication information is carried in the radio resource control RRC signaling. In the above manner, the terminal device can be instructed in a semi-static manner to configure the first DMRS and perform multiple uplink transmissions using the same transmission parameters in consecutive time units. There is no need for multiple scheduling, which can save signaling and reduce the overhead of terminal equipment.

In a third aspect, a communication device is provided, the communication device having a function of implementing the behavior in the method example of the first aspect above. The functions can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions. In a possible design, the communication apparatus includes: a transceiver unit, where the transceiver unit is configured to receive first indication information, where the first indication information is used to instruct the terminal device to configure the first demodulation reference signal on the first time unit DMRS, the first indication information is also used to indicate that multiple uplink transmissions of the terminal equipment in the first time unit and at least one second time unit satisfy the requirements of using the same transmit power, using the same precoding, or using the same antenna port. at least one.

The transceiver unit may perform the corresponding functions in the method examples of the first aspect. For details, please refer to the detailed descriptions in the method examples, which will not be repeated here.

In a fourth aspect, a communication device is provided, the communication device having a function of implementing the behavior in the method example of the second aspect above. The functions can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions. In a possible design, the communication apparatus includes a transceiver unit and a processing unit, the transceiver unit is configured to send first indication information to the terminal device, and the first information is used to instruct the terminal device to configure the first DMRS on the first time unit, The first indication information is also used to instruct the terminal device to use the same transmit power, use the same precoding, or use the same At least one of the antenna ports. The transceiver unit is further configured to receive multiple uplink transmissions from the terminal device on the first time unit and at least one second time unit. The processing unit is used to demodulate and decode multiple uplink transmissions.

These modules can perform the corresponding functions in the method examples of the second aspect. For details, please refer to the detailed descriptions in the method examples, which will not be repeated here.

In a fifth aspect, a communication apparatus is provided, and the communication apparatus may be the terminal device in the above method embodiments, or a chip provided in the terminal device. The communication device includes a processor and an interface circuit, and optionally, a memory. The memory is used to store computer programs or instructions, and the processor is coupled to the memory and the interface circuit, and when the processor executes the computer program or instructions, the communication apparatus executes the method executed by the terminal device in the above method embodiments.

In a sixth aspect, a communication apparatus is provided, and the communication apparatus may be the network device in the above method embodiment, or a chip provided in the network device. The communication device includes a processor and an interface circuit, and optionally, a memory. The memory is used to store computer programs or instructions, and the processor is coupled to the memory and the interface circuit, and when the processor executes the computer program or instructions, the communication apparatus executes the method performed by the network device in the above method embodiments.

In a seventh aspect, a computer program product is provided, the computer program product comprising: computer program code, when the computer program code is executed, the method performed by the terminal device in the above aspects is executed.

In an eighth aspect, a computer program product is provided, the computer program product comprising: computer program code, when the computer program code is executed, the method performed by the network device in the above aspects is executed.

In a ninth aspect, the present application provides a chip system, where the chip system includes a processor for implementing the functions of the terminal device in the methods of the above aspects. In a possible design, the chip system further includes a memory for storing program instructions and/or data. The chip system may be composed of chips, or may include chips and other discrete devices.

In a tenth aspect, the present application provides a chip system, where the chip system includes a processor for implementing the functions of the network device in the methods of the above aspects. In a possible design, the chip system further includes a memory for storing program instructions and/or data. The chip system may be composed of chips, or may include chips and other discrete devices.

In an eleventh aspect, the present application provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed, the method executed by the terminal device in the above aspects is implemented.

In a twelfth aspect, the present application provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed, the method executed by the network device in the above aspects is implemented.

A thirteenth aspect provides a communication system, where the communication system includes the network device and the terminal device involved in any one of the foregoing aspects.

Description of drawings

FIG. 1 is a schematic diagram of a possible communication architecture in an embodiment of the present application;

2 is a schematic diagram of a possible time unit in an embodiment of the present application;

3 is a schematic flowchart of a communication method provided by the present application;

4 shows a schematic diagram of PUSCH transmission on continuous time units in the present application;

FIG. 5 shows another schematic diagram of PUSCH transmission on continuous time units in the present application;

6 is a schematic diagram of a continuous time unit in the application;

7 is another schematic diagram of the continuous time unit in the application;

8 is another schematic diagram of the continuous time unit in the application;

9 is another schematic diagram of the continuous time unit in the application;

Figure 10 is another schematic diagram of the continuous time unit in the application;

Figure 11 is another schematic diagram of the continuous time unit in the application;

Figure 12 is another schematic diagram of the continuous time unit in the application;

13 is another schematic diagram of the continuous time unit in the application;

Figure 14 is another schematic diagram of the continuous time unit in the application;

Figure 15 is another schematic diagram of the continuous time unit in the application;

FIG. 16 is a schematic diagram of the communication device in the present application;

FIG. 17 is another schematic diagram of the communication device in the application;

FIG. 18 is another schematic diagram of the communication device in this application;

19 is a schematic structural diagram of a network device provided by the present application;

FIG. 20 is a schematic structural diagram of a terminal device provided by this application.

detailed description

The technical solutions in the embodiments of the present application can be applied to various communication systems. For example, long term evolution (Long Term Evolution, LTE) system, fifth generation (5th generation, 5G) mobile communication system and future mobile communication systems, etc.

As shown in FIG. 1 , it is a schematic diagram of a possible network architecture applicable to the embodiment of the present application, including a terminal device 110 and an access network device 120 . The terminal device 110 and the access network device 120 can communicate through the Uu air interface, and the Uu air interface can be understood as an interface between a general terminal device and a network device (universal UE to network interface). Transmission on the Uu air interface includes uplink transmission and downlink transmission.

For example, the uplink transmission refers to that the terminal device 110 sends an uplink signal to the access network device 120 . The uplink signal may include one or more of uplink data information, uplink control information, and reference signal (reference signal, RS). The channel used to transmit the uplink signal is called the uplink channel, and the uplink channel can be a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH). The PUSCH is used to carry uplink data, and uplink data may also be referred to as uplink data information. PUCCH is used to carry uplink control information (uplink control information, UCI) fed back by terminal equipment. The UCI may include channel state information (channel state information, CSI), acknowledgement (acknowledgement, ACK)/negative acknowledgement (negative acknowledgement, NACK), and the like.

In the LTE system, the access network equipment is the eNB, and the core network equipment is the MME; in the UMTS system, the access network equipment is the RNC, and the core network equipment is the SGSN; in other wireless communication systems, there are also corresponding access networks. equipment and core network equipment. In the following embodiments, the above-mentioned access network equipment and core network equipment are collectively referred to as network equipment relative to terminal equipment.

Based on the above communication system, the present application provides a communication method. Some terms or terms used in this application are explained below, and the terms or terms are also part of the content of the invention.

1. Time unit

A time unit is a time domain unit used for data transmission, which can include time domains such as radio frame, subframe, slot, mini-slot, or uplink symbol. unit. In 5G new radio (NR), the uplink time-domain symbols may be referred to as uplink symbols for short. FIG. 2 is a schematic diagram of a possible time unit relationship in the present application. Referring to FIG. 2 , the time domain length of one radio frame is 10ms. One radio frame may include 10 radio subframes, and the time domain length of one radio subframe is 1 ms. A radio subframe may include one or more time slots, and how many time slots a subframe includes is related to the subcarrier spacing. For the case where the Subcarrier Space (SCS) is 15kHz, the time domain length of one time slot is 1ms. One time slot includes 14 orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) uplink symbols. In this application, the uplink symbol is used as the abbreviation of the uplink OFDM symbol for detailed description.

2. Demodulation reference signal DMRS

DMRS is a sequence known by the transceiver and mapped on time-frequency resources with known locations. For uplink transmission, the transmitting end uses the same precoding and antenna port as the uplink transmission signal to send the DMRS. Since the DMRS and the uplink transmitted signal experience the same fading channel, the receiving end can Based on the known DMRS sequence, the equivalent fading channel experienced by the uplink signal transmission is estimated, and the uplink data demodulation is completed based on the estimated equivalent channel state information.

In the current protocol, DMRS needs to be configured for each uplink transmission. For example, DMRS parameters are configured through RRC signaling configuration. The DMRS parameters may include the parameter fields shown in Table 1.

Table 1: DMRS parameters for RRC configuration

The parameters of the DMRS include the type parameter DMRS-type, the maximum length parameter maxLength and the position parameter DMRS-additionalPosition, specifically:

The type parameter DMRS-type indicates the type of DMRS, and the selectable values are type 1 type1 and type 2 type2. type1 indicates that the DMRS adopts the comb-shaped frequency division method of 2 groups of orthogonal codes. At this time, each group occupies 6 resource elements (Resource Element, RE) in the frequency domain; type2 indicates that the DMRS adopts the comb-shaped frequency division method. Three groups of orthogonal codes are grouped by the method. At this time, each group can use 4 REs in the frequency domain. When the type2 DMRS configuration is used, there are more orthogonal code groups, which can support the parallel transmission of more layers of data.

The maximum length parameter maxLength indicates the maximum number of consecutive time-domain symbols that each configured DMRS can occupy, and the selectable values are a single single and two doubles. When maxLength=single, it means that each DMRS occupies 1 time domain symbol; when maxLength=double, it means that each DMRS can occupy 2 consecutive time domain symbols at most. 2 time domain symbols, which need to be further indicated by other fields in the DCI.

The position parameter DMRS-additionalPosition represents the number of positions of time domain symbols that can be occupied by the additional DMRS in the current uplink transmission, and can be selected as pos0, pos1, pos2, and pos3. The configuration of the pre-DMRS in uplink transmission is necessary. It can be understood that, in addition to the pre-DMRS, pos0, pos1, pos2, and pos3 indicate that the maximum number of additional DMRSs that can be configured is 0, 1, 2, and 3, respectively. .

When the above maxLength value is single, the selectable value of DMRS-additionalPosition is {Pos0,1,2,3}, that is, a maximum of 4 DMRSs (including pre-DMRS and additional DMRS) can be configured, and each DMRS occupies 1 time domain symbols. When the above maxLength value is double, the selectable value of DMRS-additionalPosition is {Pos0,1}, that is, a maximum of 2 DMRS (including pre-DMRS and additional DMRS) can be configured, and each DMRS can occupy 2 time domains symbol. It can be understood that, in the current protocol, in the case that a PUSCH is transmitted in one time slot, the DMRS configured by the network device occupies at most 4 uplink symbols. Usually, when the channel time changes rapidly, more DMRSs need to be configured for accurate channel estimation and uplink data demodulation. However, at this time, the time domain symbols occupied by the DMRSs are more, because the REs occupied by the DMRSs cannot be sent on the REs. For uplink data, the pilot overhead is relatively large at this time, which will reduce the uplink transmission efficiency.

In the current protocol, the resource mapping of PUSCH can be divided into two types according to the starting time domain symbol position of PUSCH in the current time slot, which are called mapping type A (Mapping Type A) and mapping type B (Mapping Type B).

When the PUSCH resource is mapped to Type A, the PUSCH starts from the first time-domain symbol of the current slot, and the length of the continuous time-domain symbol is at least 4. At this time, the starting position of the pre-DMRS can be determined by dmrs-typeA-Position in the RRC signaling. Specifically, the starting position of the pre-DMRS can be located in the third uplink symbol or the fourth uplink symbol of the current PUSCH. symbol.

When the PUSCH resource is mapped to Type B, the starting symbol position of the PUSCH can be located at any position in the current time slot, and the duration can be any value. At this time, the time domain symbol position where the pre-DMRS is located must be the first uplink symbol of the current PUSCH.

The positions of other more additional DMRSs may be known from a predefined table according to the length of time domain symbols included in the current PUSCH transmission and the PUSCH resource mapping type. Generally, when the number of time-domain symbols included in the PUSCH transmission is greater, the number of DMRSs that can be configured is greater, so as to ensure the accuracy of channel estimation.

3. Repeat transmission and retransmission

Due to the small number of antennas of current terminal equipment and limited transmission power, compared with the downlink transmission capability of network equipment, uplink transmission is obviously insufficient in transmission rate and coverage distance, and coverage enhancement of uplink transmission is required. Usually, network equipment can be configured with multiple repeated transmissions or retransmissions. By combining the data transmitted multiple times, the signal-to-noise ratio of the received signal at the receiving end can be improved, channel estimation and data decoding can be performed more accurately, and the uplink transmission can be enhanced. performance.

Repeated transmission means that the network equipment instructs the terminal equipment to perform continuous multiple repeated transmissions on the effective uplink time domain resources through one scheduling, and the base station performs demodulation and decoding after receiving and combining the continuous multiple uplink transmissions; retransmission is It means that when the network device fails to demodulate and decode the current uplink transmission, it dynamically instructs the terminal device to perform another retransmission.

In the existing NR protocol, the communication system supports two different types of PUSCH repeated transmission, which are the repeated transmission of PUSCH type A (PUSCH repetition Type A) and the repeated transmission of PUSCH type B (PUSCH repetition Type B). Among them, the repeated transmission of PUSCH type A is based on time slots, and it is required that the position and length of the time domain symbols occupied by the PUSCH on each time slot used for the repeated transmission of PUSCH are the same, and PUSCH cannot be performed on time slots that do not meet the above conditions. repeated transmissions. For the repeated transmission of PUSCH type B, the repeated transmission of PUSCH is not limited to transmission based on time slots, but the repeated transmission of PUSCH is performed on multiple consecutive uplink symbols starting from a certain initial uplink symbol.

4. Time Division Duplex (TDD) and Frequency Division Duplex (FDD)

TDD and FDD are two major duplex modes in communication systems. For the TDD mode, uplink and downlink data transmissions are interleaved according to time allocation. For FDD, uplink and downlink data are transmitted simultaneously in different frequency bands.

5. Flexible time slots

According to the type of time domain symbols contained in the time slot, the time slot can be divided into an uplink time slot, a downlink time slot and a flexible time slot. Among them, all time domain symbols in uplink time slots are uplink time domain symbols, all time domain symbols in downlink time slots are downlink time domain symbols, and the time domain symbols contained in flexible time slots are not all uplink time domain symbols Or not all downlink time domain symbols, flexible time slots may include two or three types of uplink symbols, downlink symbols and flexible symbols. For example, a flexible time slot may include downlink time domain symbols and flexible time domain symbols, may also include flexible time domain symbols and uplink time domain symbols, and may also include downlink time domain symbols, flexible time domain symbols, and uplink time domain symbols. Among them, the uplink time domain symbols are used for uplink transmission, the downlink symbols are used for downlink transmission, and the flexible symbols can be used for uplink transmission or downlink transmission. When the subcarrier interval is 30KHz, the duration of one TDD frame is 10ms, each frame contains 10 subframes, the duration of each subframe is 1ms, and each subframe can contain two time slots. The duration is 0.5ms. In a frame, according to the requirements of different uplink and downlink service rates, different numbers of uplink and downlink time slot ratios can be configured. Table 2 shows a schematic diagram of a common TDD frame structure.

Table 2: An example of uplink and downlink time slot allocation in TDD frame structure

S represents a flexible time slot, also known as a special time slot, D represents a downlink time slot, and U represents an uplink time slot. Usually, the uplink and downlink switching is performed in the S time slot, wherein the S time slot contains downlink time domain symbols and flexible time domain symbols. and uplink time domain symbols. Usually, because the demand of uplink services is less than that of downlink services, the number of uplink symbols contained in the S time slot is less than that of the downlink symbols. The common symbol ratio in the S time slot is, downlink time domain symbols: flexible time domain symbols: uplink The time domain notation is 10:2:2 or 6:4:4. In the common TDD timeslot configuration shown in Table 1, the U timeslots that are continuous with the S timeslots can be in the form of SU, SUU, and SUUU. Therefore, PUSCH repeated transmission can be performed on the uplink resources of the continuous timeslots. However, when the PUSCH repeated transmission is type A, and the number of uplink symbols occupied by a single uplink transmission is greater than 4 or the starting position of the uplink transmission is not on the uplink time domain symbol of the S slot, the PUSCH cannot be transmitted on the S slot. Repeated transmission, at this time, the corresponding time domain resources on the S time slot will also be wasted.

6. Terminal equipment

A terminal device may be referred to as a terminal for short, also referred to as user equipment (user equipment, UE), which is a device with a wireless transceiver function. Terminal equipment can be deployed on land, including indoor or outdoor, handheld or vehicle; can also be deployed on water (such as ships, etc.); can also be deployed in the air (such as aircraft, drones, balloons and satellites, etc.). The terminal device can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality terminal device, an augmented reality terminal device, a wireless terminal device in industrial control, a wireless terminal device in unmanned driving, and a wireless terminal device in telemedicine. Terminal equipment, wireless terminal equipment in smart grid, wireless terminal equipment in transportation safety, wireless terminal equipment in smart city, wireless terminal equipment in smart home. Terminal devices can also be stationary or mobile. This embodiment of the present application does not limit this.

In this embodiment of the present application, the apparatus for implementing the function of the terminal may be a terminal device; it may also be an apparatus capable of supporting the terminal device to implement the function, such as a chip system, and the apparatus may be installed in the terminal device. In this embodiment of the present application, the chip system may be composed of chips, or may include chips and other discrete devices. In the technical solutions provided by the embodiments of the present application, the technical solutions provided by the embodiments of the present application are described by taking the device for realizing the functions of the terminal device as the terminal device as an example.

Seven, network equipment

A network device may be an access network device, and an access network device may also be called a radio access network (RAN) device, which is a device that provides wireless communication functions for terminal devices. Access network equipment includes, but is not limited to, the next generation base station (generation nodeB, gNB), evolved node B (evolved node B, eNB), baseband unit (baseband unit, BBU) in 5G, transmitting and receiving points (transmitting and receiving), for example, but not limited to: point, TRP), transmitting point (transmitting point, TP), the base station in the future mobile communication system or the access point in the WiFi system, etc. The access network device may also be a wireless controller, a centralized unit (centralized unit, CU), and/or a distributed unit (DU) in a cloud radio access network (cloud radio access network, CRAN) scenario, or a network The device may be a relay station, a vehicle-mounted device, and a network device in a future evolved PLMN network, and the like.

A terminal device can communicate with multiple access network devices of different technologies. For example, a terminal device can communicate with an access network device that supports long term evolution (LTE), and can also communicate with an access network device that supports 5G. It can also communicate with LTE-enabled access network devices and 5G-enabled access network devices at the same time. The embodiments of the present application are not limited.

In this embodiment of the present application, the apparatus for implementing the function of the network device may be a network device; it may also be an apparatus capable of supporting the network device to implement the function, such as a chip system, and the apparatus may be installed in the network device. In the technical solutions provided by the embodiments of the present application, the technical solutions provided by the embodiments of the present application are described by taking the device for realizing the function of the network device being a network device as an example.

Eight, uplink (uplink, UL) configuration authorization (configured grant, CG)

The uplink configuration authorization means that the uplink transmission of the terminal device does not require scheduling by the network device, and the terminal device performs the uplink transmission according to the configuration information. Uplink configuration grant transmission, also known as grant free (GF) or scheduling-free uplink transmission. The uplink configuration authorization includes two types, namely, the uplink configuration authorization of type 1 and the uplink configuration authorization of type 2. The difference between the two is that all parameters in the type 1 uplink configuration authorization are pre-configured by the network device. Therefore, when the terminal device uses the type 1 uplink configuration authorization to send uplink service data, it directly uses the parameters configured by the network device. That is, no additional scheduling information is required. On the other hand, when the terminal device uses the type 2 uplink configuration authorization to send uplink service data, it needs to receive an additional trigger to send information before it can perform uplink data transmission.

9. Uplink transmission

Uplink transmission includes transmission of uplink DMRS and/or uplink data. The receiver needs to perform independent channel estimation for different uplink transmissions, so as to demodulate and decode the uplink data. The uplink data includes valid information and redundant information, and the uplink data is carried on the PUSCH.

For the repeated transmission of the PUSCH, through a scheduling instruction, the terminal device transmits the PUSCH repeatedly on the configured resources, and each PUSCH transmission corresponds to independent data modulation and/or channel coding. The network device performs demodulation and decoding after receiving and combining multiple PUSCH repeated transmissions to improve the demodulation and decoding performance of uplink transmission. Each repeated transmission of the PUSCH corresponds to a different uplink transmission.

For the transmission of different PUSCHs, the uplink data corresponding to the different PUSCH transmissions are different, and the uplink transmissions to which the different PUSCH transmissions belong are different. For network equipment, independent channel estimation, independent demodulation and decoding are required for different PUSCH transmissions. Transmissions of different PUSCHs correspond to different uplink transmissions.

For PUSCH retransmission, each PUSCH retransmission corresponds to an uplink scheduling instruction, the terminal device retransmits the PUSCH on the time-frequency resources configured by the scheduling instruction, and the network device receives and combines the PUSCH received after multiple retransmissions. demodulation and decoding, thereby improving the demodulation and decoding performance of uplink transmission. Each PUSCH retransmission corresponds to a different uplink transmission.

10. Random access

Random access is a process of establishing a wireless link connection between a terminal device and a network device. Only after the random access is completed, normal data interoperation can be performed between the network device and the terminal device. According to different service triggering methods, random access can be divided into contention based random access procedure and non-contention based random access procedure. The main process of contention-based random access has four steps. In the first step, the terminal device sends a random access preamble (Random Access Preamble, MSG1, also known as the first message); in the second step, the network device sends a random access response (Random Access Response, MSG2, also known as the second message) ; In the third step, the terminal device sends an RRC connection request (Scheduled Transmission, MSG3, also known as the third message); in the fourth step, the network device sends an indication of successful access (Contention Resolution, MSG 4, also known as the fourth message) , the so-called "competition" means that there may be such a situation that multiple terminal devices use the same PRACH resources of the physical random access channel to send the same preamble sequence to the network device in the same subframe, hoping to obtain the resources of the network device. Authorization. At this time, the network device cannot know which terminal device sent the request. Therefore, each subsequent terminal device needs to send a unique message that is only related to itself, that is, the third message in the third step. Further, the network After the device receives the third message, it sends back a message to the terminal device, that is, the fourth message, to confirm which terminal device is currently connected successfully. This mechanism is the competition resolution mechanism.

In an embodiment of the present application, the network device instructs the terminal device to configure the first DMRS in the first time unit through the first indication information, and instructs the terminal device to use the same transmission parameters in the first time unit and at least one second time unit For uplink transmission, the same transmission parameters include at least one of the following: the same precoding, the same antenna port, the same transmission power, and the like. The first time unit and the at least one second time unit may be consecutive time units. After receiving the first indication information, the terminal device may configure the first DMRS on the first time unit, and perform multiple uplink transmissions using the same transmission parameters on the first time unit and at least one second time unit. In the above manner, the terminal device uses the same transmission parameters to perform uplink transmission on consecutive time units of the first time unit according to the first indication information of the network device, and the network device can perform uplink transmission on the first time unit and at least one local time unit. All DMRS perform joint channel estimation to improve the accuracy of channel estimation and improve the demodulation and decoding performance of uplink transmission signals.

Referring to FIG. 3, an embodiment of a communication method of the present application includes:

S301: The network device determines the parameters of the first DMRS, and sends the parameters of the first DMRS to the terminal device.

Specifically, the network device determines the parameters of the first DMRS according to the pre-configuration, or the network device determines the parameters of the first DMRS based on the uplink transmission time domain resources and/or channel quality status and/or uplink transmission requirements. The parameters of the first DMRS include the number of the first DMRS and indication information of uplink symbols occupied by each DMRS.

Optionally, the number of the first DMRS is one or two, and the uplink symbol occupied by each first DMRS may be one uplink symbol or two uplink symbols. In an implementation manner, similar to the pre-DMRS or the additional DMRS, the first DMRS may also have multiple configuration parameters, the network device configures the pattern of the first DMRS through high-level signaling, and dynamically indicates the number of the first DMRS through the indication information. and the uplink symbols occupied by each first DMRS. In another implementation manner, the number of first DMRSs can be configured by network equipment, and the number of uplink symbols occupied by each first DMRS is the same as the number of uplink symbols occupied by each pre-DMRS. The number of uplink symbols is indicated by high-layer signaling, and at this time, it can be understood that the number of the first DMRS and the number of occupied uplink symbols are both configured by the network device.

In another embodiment, the number of the first DMRS and/or the occupied uplink symbols may be preset fixed values. In this case, step S301 is not required. For example, the number of the first DMRSs is preconfigured to one, occupying one or two uplink symbols, or the number of the first DMRSs is preconfigured to be two, and the two first DMRs occupy two or four uplink symbols. For another example, the number of the first DMRS is preconfigured as one, and the number of time domain symbols occupied by the first DMRS is the same as the number of time domain symbols occupied by each pre-DMRS, because the number of uplink symbols occupied by each pre-DMRS is determined by The high-layer signaling indicates that, at this time, it can also be understood that the number of the first DMRS is a predefined fixed value, and the number of uplink symbols occupied by the first DMRS is configured by the network device.

S302: The network device sends the first indication information to the terminal device, and correspondingly, the terminal device receives the first indication information sent by the network device.

Specifically, the first indication information is used to instruct the terminal device to configure the first DMRS on the first time unit. The first indication information is further used to indicate that multiple uplink transmissions of the terminal device in the first time unit and at least one second time unit satisfy at least one of the same transmit power, the same precoding or the same antenna port.

In an implementation manner, the first time unit and the at least one time unit are continuous time units in the time domain. The first time unit and the at least one time unit may also be referred to as consecutive time units.

In an implementation manner, the first DMRS occupies the last M uplink symbols in the uplink symbols of the first time unit, where M is a natural number less than or equal to 4.

The number of time units included in the at least one second time unit may be predefined, or may be indicated by the network device. For example, the at least one time unit is predefined as one, two or three time units. For another example, the network device indicates that the at least one second time unit includes one, two or three time units through the indication information of the number of time units.

The first time unit may be a flexible time slot or an uplink time slot, and the at least one second time unit is an uplink time slot. When the first time unit is a flexible time slot, since there are fewer uplink time domain symbols in the flexible time slot, it cannot be used in the repetition of type A of PUSCH or PUCCH, which may cause resource waste. Therefore, configure the first time unit on the first time unit. The DMRS can make full use of these resources to improve the channel estimation accuracy of uplink transmission, thereby improving the uplink transmission capability.

In an implementation manner, the first indication information may include a first field and a second field, which respectively explicitly instruct the terminal device to configure the first DMRS in the first time unit and explicitly instruct the terminal device to configure the first DMRS in the first time unit. and multiple uplink transmissions on at least one second time unit satisfy at least one of the same transmit power, the same precoding, or the same antenna port. For example, there are two fields in the first indication information to respectively indicate the above two types of information. Indicates that multiple uplink transmissions of the terminal device on the first time unit and at least one second time unit satisfy at least one of the same transmit power, the same precoding, or the same antenna port, that is, indicating that the first time unit and the next or a joint channel estimate of multiple time units.

In another implementation manner, the first indication information only includes the first field, the first field is used to instruct the terminal device to configure the indication information of the first DMRS on the first time unit, and the terminal device confirms that the first indication information includes the When the first field is specified, multiple uplink transmissions of the terminal device in the first time unit and at least one second time unit satisfy at least one of the same transmit power, the same precoding, or the same antenna port. That is, it explicitly instructs the terminal device to configure the first DMRS on the first time unit, and implicitly instructs the terminal device to perform multiple uplink transmissions in the first time unit and at least one second time unit to satisfy the same transmit power and same transmission power. at least one of precoding or the same antenna port. The first indication information can also be understood as that the network device instructs the terminal device to configure the first DMRS on the first time unit, and is also used to instruct the terminal device to use the same transmission parameters to perform transmission on multiple consecutive time units including the first time unit. upstream transmission. That is, the first field in the first indication information is used to instruct the terminal device to configure the first DMRS on the first time unit, and it is also used to instruct the terminal device to use the same transmission parameters on multiple consecutive time units including the first time unit. Perform upstream transmission. The same transmit parameter may be at least one of the same transmit power, the same precoding, or the same antenna port. Alternatively, the first indication information can also be understood as that the configuration of the first DMRS is also used to indicate the joint channel estimation of the first time unit and the next at least one second time unit.

In an implementation manner, the first indication information is borne in higher layer signaling, DCI or PDSCH, or the first indication information is borne in higher layer signaling and DCI. In one way, when these signalings carry the indication information for configuring the first DMRS, the terminal equipment is implicitly instructed to use the same transmission parameters to perform uplink transmission in continuous time units. For example, the first indication information is carried in a Indication field, the same state value of the indication field also instructs the terminal device to configure the first DMRS and the terminal device to use the same transmission parameters to perform uplink transmission on continuous time units. In another way, the signaling carries the first indication information, and the first indication information is carried in two different fields, wherein the state value of one field is used to instruct the terminal device to configure the first DMRS, and the state of the other field is used to instruct the terminal device to configure the first DMRS. The value is used to instruct the terminal equipment to use the same transmission parameters for uplink transmissions on consecutive time units.

When the first indication information is carried in high layer signaling, the network device instructs the terminal device to configure the first DMRS through the configuration parameters in the high layer signaling, and instructs the terminal device to use the same transmission parameters to perform uplink transmission in continuous time units. For example, the configuration field ConfiguredGrantConfig::Type1-CGPUSCHSpecialDMRS={2, 3, 4, 5, ...}, etc., where {2, 3, 4, 5, ...} is the time domain length corresponding to the continuous time unit. Taking the time unit as a time slot as an example, the terminal device receives the first indication information, and the terminal device performs the first DMRS configuration in units of every n time slots according to the value n indicated by the above parameter. Optionally, for the FDD mode, the uplink information is sent in units of every n U time slots as a continuous time unit, and the first DMRS is configured.

When the first indication information is carried in the DCI, the network device dynamically instructs the terminal device to configure the first DMRS through an indication field in the DCI, and instructs the terminal device to use the same transmission parameters to perform uplink transmission in continuous time units.

When the first indication information is carried in the PDSCH, the network device dynamically instructs the terminal device to configure the first DMRS through an indication field in the PDSCH indicating the uplink grant, and instructs the terminal device to use the same transmission parameters to perform uplink transmission on continuous time units .

When the first indication information is carried in higher layer signaling and DCI, optionally, the higher layer signaling may be RRC signaling. Specifically, the network device indicates through RRC signaling that the terminal device may have the capability to configure the first DMRS, and further, the network device indicates activation and deactivation of the first DMRS configuration through DCI. For the terminal device, after receiving the DCI indicating the activation of the first DMRS configuration, the first DMRS will be configured on the available resources for uplink transmission. When there is a service requirement, the terminal device will use the same transmission parameters to send the PUSCH on the available resources configured by the RRC. For example, for the FDD mode, the available resources configured by the RRC may be continuous U time slots, the terminal device receives the activation indication, and when there is a service requirement, the terminal device will send the PUSCH on the continuous U time slots configured by the RRC.

S303: The terminal device performs multiple uplink transmissions on the first time unit and at least one second time unit according to the first indication information. Correspondingly, the network device receives the terminal device on the first time unit and at least one second time unit. multiple upstream transmissions.

Specifically, multiple uplink transmissions performed by the terminal device in the first time unit and at least one second time unit satisfy at least one of the following: the same transmit power and the same precoding. The first time unit and the at least one second time unit are continuous time units in the time domain.

The uplink transmission on the first time unit includes the first DMRS. Optionally, the uplink transmission in the second time unit may also include at least one of the first DMRS or the second DMRS. Wherein, the second DMRS includes at least one of a preamble DMRS or an additional DMRS. Since the more the number of DMRSs, the higher the accuracy of channel estimation, the first DMRS is configured on the first time unit (or the first time unit and the second time unit), which increases the number of DMRSs. At this time, the network device The channel estimation is performed based on all the DMRSs in consecutive multiple time units, which improves the estimation accuracy of the time domain symbol channel state information of the consecutive multiple time units, and helps to improve the performance of uplink data demodulation. Optionally, the uplink transmission in the first time unit may also include at least one of the first DMRS or the second DMRS. The uplink transmission on the second time unit may also include uplink data.

Specifically, the multiple uplink transmissions on the first time unit and at least one second time unit may be multiple PUSCH repeated transmissions, multiple PUSCH retransmissions, or multiple different PUSCH retransmissions. Transmission of PUSCH. The multiple times of repeated transmission of the PUSCH refers to multiple times of repeated transmission of the same uplink data, and the multiple times of repeated transmission of the PUSCH corresponds to the same transport block. The retransmission of the multiple PUSCH transmissions refers to the first transmission of the same uplink data, and the retransmission after the first transmission, and the multiple PUSCH retransmissions correspond to the same transmission block. The transmission of the multiple different PUSCHs refers to the transmission of different uplink data, and the transmission of the multiple different PUSCHs corresponds to different transport blocks. The transport block is a sequence of information bits to be transmitted. Referring to an example of PUSCH transmission on consecutive time units shown in FIG. 4 , four PUSCH transmissions are performed on four consecutive time slots, and the PUSCH transmission in FIG. 4 is Type A repeated transmission.

In the case of repeated transmission of PUSCH corresponding to multiple consecutive time units, each PUSCH transmission may occupy an uplink symbol of less than one time slot, or may occupy an uplink symbol of more than one time slot, for example, the continuous time unit is 4 time slots slot, each PUSCH transmission occupies 7 uplink symbols, and the number of repeated transmissions is 8. For another example, the continuous time unit is 3 time slots, each PUSCH transmission occupies 21 uplink symbols, and the number of repeated transmissions is 2.

For the case where the continuous time unit corresponds to the transmission of multiple different PUSCHs, the transmission of each PUSCH in the multiple different PUSCH transmissions may occupy an uplink symbol smaller than one time slot, or may occupy an uplink symbol larger than one time slot, for example, The continuous time unit is 3 time slots, corresponding to the transmission of three different PUSCHs. The first PUSCH transmission occupies 7 uplink symbols, the second PUSCH transmission occupies 10 uplink symbols, and the third PUSCH transmission occupies 25 uplink symbols. For another example, the continuous time unit is 3 time slots, corresponding to the transmission of four different PUSCHs, the transmission of the first PUSCH occupies 9 uplink symbols, the transmission of the second PUSCH occupies 10 uplink symbols, and the transmission of the third uplink corresponds to 11 uplink symbols, the fourth uplink transmission corresponds to 12 uplink symbols. For another example, the continuous time unit is 3 time slots, corresponding to two different PUSCH transmissions, wherein the transmission of the first PUSCH is a one-time transmission, the transmission of the second PUSCH is a repeated transmission, and the transmission of the first PUSCH occupies 14 Uplink symbols, the transmission of the second PUSCH occupies 7 symbols, and the number of repeated transmissions is 4 times.

In the case of multiple PUSCH retransmissions corresponding to consecutive time units, the first PUSCH transmission may occupy uplink symbols less than one time slot, or may occupy uplink symbols greater than one time slot, for example, the number of continuous time units is 3 Time slot, the first PUSCH transmission occupies 7 uplink symbols, and the number of retransmissions after the first transmission is 5. For another example, the continuous time unit is 3 time slots, the first PUSCH transmission occupies 21 uplink symbols, and the number of retransmissions after the first transmission is 1.

It should be noted that, for the case where one PUSCH transmission occupies multiple time units, the first time unit and at least one second time unit may also correspond to only one PUSCH transmission. Figure 5 shows the PUSCH on consecutive time units. Another example of transmission, in FIG. 5 , the first time unit and at least one second time unit are consecutive K time slots, K is a positive integer greater than or equal to 2, and K time slots correspond to one PUSCH transmission. When K is equal to 2, one PUSCH transmission occupies two time slots, and only one PUSCH transmission corresponds to two consecutive time slots.

S304: The network device demodulates and decodes the uplink transmission.

Specifically, after receiving multiple uplink transmissions from the terminal device in the first time unit and at least one second time unit, the network device demodulates and decodes the uplink transmissions.

In an implementation manner, after receiving multiple uplink transmissions on the first time unit and at least one second time unit, the network device performs joint channel estimation based on all the DMRSs in the multiple uplink transmissions, thereby estimating each time unit. Channel state information on each time domain symbol of . Based on the channel state information obtained by channel estimation, the uplink data of multiple uplink transmissions are demodulated and decoded respectively to obtain valid data of multiple uplink transmissions.

In another implementation manner, after receiving multiple uplink transmissions on the first time unit and at least one second time unit, the network device performs joint channel estimation based on all the DMRSs in the multiple uplink transmissions, thereby estimating each time. Channel state information on individual time-domain symbols of the cell. Based on the channel state information obtained by channel estimation, the uplink data of multiple uplink transmissions is uniformly demodulated and decoded to obtain valid data of multiple uplink transmissions.

In another implementation manner, after receiving each uplink transmission in the multiple uplink transmissions, the network device performs joint channel estimation based on all the DMRSs in the multiple uplink transmissions to obtain the channel state information. Based on the channel state information obtained by channel estimation, the uplink data of each uplink transmission is first demodulated and decoded, and then unified demodulation and decoding are performed to obtain valid data of multiple uplink transmissions.

In the above embodiment, the network device instructs the terminal to configure the first DMRS, and uses the same transmission parameters to perform multiple uplink transmissions to the network device in the first time unit and at least one second time unit. The feasibility of joint channel estimation for secondary uplink transmission improves the accuracy of channel estimation and saves signaling overhead of indication information.

In one embodiment, the communication method further includes:

S305: According to the first indication information, the terminal device configures the first DMRS on the first time unit.

In an optional manner, the terminal device configures the first DMRS only on the first time unit. In yet another optional manner, the terminal device configures the first DMRS in the first time unit, and also configures the first DMRS on other time units except the last time unit in the at least one second time unit, that is, , the terminal device configures the first DMRS on all other time units except the last time unit in the continuous time unit. In yet another optional manner, the terminal device is configured with the first DMRS on each time unit of the first time and at least one second time unit, that is, the terminal device is configured on all time units in the consecutive time units. Both are configured with the first DMRS. The number of the first DMRS and the number of occupied symbols may be pre-configured fixed values, or may be indicated by the network device through the information of the parameters of the first DMR, that is, the first DMRS sent by the network device to the terminal device in step S301. Information about the parameters of a DMRS.

In an implementation manner, the indication information for configuring the first DMRS on the first time unit is further used to indicate joint channel estimation of the first time unit and at least one second time unit. Wherein, for joint channel estimation, on the terminal device side, it may refer to the fact that multiple uplink transmissions of the terminal device in the first time unit and at least one second time unit satisfy the same transmit power, the same precoding, or the same antenna port at least one of. Joint channel estimation, on the network device side, can refer to using all DMRS included in the received signal on multiple time units to perform channel estimation uniformly, and then demodulate and decode the received signal after obtaining more accurate channel state information. . Specifically, for the configuration of the first DMRS, for the convenience of description, the first configuration mode is used to represent the configuration of the first DMRS only in the first time unit, and the second configuration mode is used to represent the configuration except the last time unit in the continuous time unit. In the case where the first DMRS is configured on time units other than one time unit, the third configuration mode is used to represent the case where the first DMRS is configured on each time unit of consecutive time units. The network device may send the indication information of the configuration of the first DMRS to the terminal device, indicating which configuration mode of the three configuration modes the terminal device adopts. Alternatively, it is also possible to predefine which configuration mode the terminal device adopts among the three configuration modes.

In an implementation manner, the first indication information instructs the terminal device to configure the first DMRS on the first time unit, and the first indication information may simultaneously indicate three configuration modes. For example, the first indication information is carried in an N-bit indication field, and different states of the first indication information indicate different configuration modes.

In an implementation manner, the first indication information indicates that the terminal device needs to configure the first DMRS in the first time unit, and the three configuration manners are indicated by indication information different from the configuration manners of the first indication information. Specifically, the network device and the terminal device are preconfigured with one of the three configuration modes, that is, the terminal device receives the first indication information, and when the indication information of the configuration mode is not detected, the terminal device defaults to the first DMRS as In the above-mentioned pre-configured mode, when the terminal device detects the indication information of the configuration mode, the terminal device determines, according to the content of the indication information, that the configuration of the first DMRS is one of the remaining two configuration modes other than the above-mentioned pre-configured mode. what kind. For example, the indication information of the configuration mode is carried in a 1-bit indication field, and the two state values of the 1-bit indication field respectively correspond to the remaining two configuration modes other than the above-mentioned pre-configured modes. The equivalent effect is that the first indication information indicates one of the three configuration manners, and the indication information of the configuration manner indicates the remaining two configuration manners other than the configuration manner indicated by the first indication information.

In an implementation manner, the first indication information indicates that the terminal device needs to configure the first DMRS in the first time unit, and the three configuration manners are indicated by indication information different from the configuration manners of the first indication information. Specifically, the indication information of the configuration mode is carried in an N-bit indication field, where N is a positive integer greater than or equal to 2, and different state values of the N-bit indication field correspond to different configuration modes. For example, N is 2, corresponding to four state values, wherein the three state values respectively indicate the first configuration mode, the second configuration mode and the third configuration mode.

By configuring the first DMRS, on the one hand, more DMRSs are configured for the terminal device to improve the accuracy of channel estimation at the receiving end, and on the other hand, the terminal is implicitly instructed to use the same transmission parameters for uplink transmission in continuous time units. The configuration of the DMRS and the uplink transmission corresponding to the same transmission parameters on the continuous time unit, the network device uses all the DMRS on the continuous time unit to perform joint channel estimation.

In an implementation manner, the DMRS on the first time unit and the at least one second time unit include a first DMRS and a second DMRS, and the second DMRS includes a preamble DMRS and/or an additional DMRS.

For one or more time units in which the first DMRS is configured, there may be different implementation manners for the position of the uplink symbol occupied by the first DMRS. Taking the first time unit as an example, the position of the uplink symbol occupied by the first DMRS on the one or more time units in which the first DMRS is configured is described in detail. In an implementation manner, the first DMRS occupies the last N uplink symbols in the uplink symbols of the first time unit, and further optionally, N is a natural number less than or equal to 4. For example, when the number of the first DMRS is 1 and each DMRS occupies 1 uplink symbol, the first DMRS configured by the network device occupies the last uplink symbol in the uplink symbols of the first time unit; the number of the first DMRS is 1 , when each DMRS occupies 2 uplink symbols, the first DMRS configured by the network device occupies the last two uplink symbols in the uplink symbols of the first time unit; the number of the first DMRS is 2, and each DMRS occupies 2 uplink symbols When the first DMRS configured by the network equipment occupies the last four uplink symbols in the uplink symbols of the first time unit; the number of the first DMRSs is 2, and when the 2 first DMRSs occupy 1 uplink symbol and 2 uplink symbols respectively , the first DMRS configured by the network device occupies the last three uplink symbols in the uplink symbols of the first time unit. At this time, since the position of the uplink symbol occupied by the first DMRS in the first time unit is closer to at least one second time unit, that is, closer to at least one second time unit that is continuous with the first time unit, it can be estimated more accurately The channel state information on different time domain symbols of different time units on consecutive time units is obtained. In another implementation manner, the location of the uplink symbol occupied by the first DMRS may also be another predefined location or any location dynamically indicated by the first indication information. For example, the first DMRS occupies the middle uplink symbol of the first time unit, or the preceding uplink symbol.

Further, for one or more time units configured with the first DMRS, the one or more time units configured with the first DMRS may further include a second DMRS. Taking the first time unit as an example, the relationship between the first DMRS and the second DMRS on one or more time units in which the first DMRS is configured will be described in detail. Specifically, the number and position of the second DMRS may not be affected by the first DMRS, or may be adjusted based on the configuration of the first DMRS, where the position is the position of the uplink symbol configured by the DMRS in the first time unit.

Specifically, the relationship between the first DMRS and the second DMRS on the first time unit may include the following examples:

The first type is that the first DMRS occupies the last one or the last multiple uplink symbols of the first time unit, and the number and position of the second DMRS are not affected by the configuration of the first DMRS. At this time, the total number of DMRSs increases, which helps to improve the accuracy of channel estimation.

In the second type, the first DMRS occupies the last one or the last of the uplink symbols of the first time unit, the number of the second DMRS is not affected, and the position of the second DMRS is configured to be on a continuous time unit based on the position of the first DMRS. Evenly distributed multiple DMRS. At this time, the positions of all DMRSs are distributed more evenly, which is helpful for more accurate time-domain difference channel estimation.

The third type is that the first DMRS occupies the last one or the last multiple uplink symbols of the first time unit, and the number of second DMRSs is correspondingly reduced, and the corresponding reduction refers to the number of uplink symbols occupied by the reduced DMRSs by the second DMRS. The number is the same as the number of uplink symbols occupied by the configuration first DMRS. At this time, the resource overhead of the total DMRS remains unchanged. For example, each first DMRS and each second DMRS occupy one uplink symbol, the number of the first DMRS is 1, and in this case, the number of the second DMRS may be correspondingly reduced by one. Further, since the configuration of the first DMRS is added, and the position of the first DMRS is located in the last M uplink symbols of the first time unit, the terminal device can position the second DMRS configured by the RRC signaling close to at least one second time. unit, and one or more DMRSs occupying M uplink symbols are de-configured. For the DMRSs that are reserved or not de-configured in the second DMRS, the following configuration methods can be used:

Mode 1: The positions of the DMRSs that are reserved or unconfigured in the second DMRS may not be affected by the first DMRS, that is, they can be distributed according to the original positions in the configuration pattern indicated by the RRC signaling. The effect is to move the DMRS positions that are located at the back and occupy M uplink symbols in the second DMRS of the original configuration to the M uplink symbol positions configured for the first DMRS, and the uplink symbols occupied by the second DMRS in the original configuration are moved. The number of symbols is the same as the number of uplink symbols occupied by all DMRSs after the first DMRS is configured. The resource overhead of the total DMRS remains unchanged, and by configuring the first DMRS closer to at least one second time unit, it helps to improve the accuracy of the joint channel estimation of multiple time units.

Mode 2, the DMRSs that are reserved or unconfigured in the second DMRS can also be configured according to the pattern corresponding to the number of DMRSs that are not unconfigured in the second DMRS in the configuration pattern indicated by the RRC signaling, and the original RRC The value pos n of the DMRS-additionalPosition configured by the signaling is subtracted from the value k of the first DMRS, and the value pos(nk) of the DMRS-additionalPosition of the updated second DMRS is obtained by calculating, according to the value of the updated DMRS-additionalPosition Configure the second DMRS from a predefined table. For example, the number of the first DMRS is 1, occupying 1 uplink symbol, and the position of the second DMRS configured by the RRC signaling is pos3, that is, there are three configurable positions except the pre-DMRS, or the number of additional DMRSs is Three, at this time, the configuration of the additional DMRS in the positions of the 3 additional DMRSs close to at least one second time unit may be canceled, and the configuration of the additional DMRS at the remaining two positions is reserved. At this time, it is equivalent to moving the position of the DMRS closest to at least one second time unit in the original second DMRS configuration to the position of the first DMRS configuration. For another example, the number of the first DMRS is 1, occupying 1 time domain symbol, the position of the second DMRS configured by the RRC signaling is pos3, and the terminal device obtains the updated pos(3-1) through calculation, and it can be considered that the current The configuration of the second DMRS is pos2, and the terminal device directly configures the DMRS that is not deconfigured in the second DMRS according to the position in pos2.

Fourth, the first DMRS occupies the last one or the last multiple uplink symbols of the first time unit, the number of second DMRSs is correspondingly reduced, and the positions of the second DMRSs are evenly distributed on consecutive time units based on the first DMRS. The corresponding reduction means that the number of time domain symbols occupied by the DMRS reduced by the second DMRS is the same as the number of time domain symbols occupied by the configured first DMRS. For example, each first DMRS and each second DMRS occupy one time-domain symbol, and the number of the first DMRS is 1. At this time, the number of the second DMRS can be correspondingly reduced by 1, because the configuration of the first DMRS is increased. , and the position of the first DMRS is located in the last one or more uplink symbols of the first time unit, the terminal equipment can de-configure the corresponding DMRS located close to the second time unit in the second DMRS configured by the RRC signaling. The DMRSs that are reserved and configured in the DMRS may be configured as multiple DMRSs that are uniformly distributed in consecutive time units based on the position of the first DMRS. At this time, the number of uplink symbols occupied by the second DMRS in the original configuration is the same as the number of uplink symbols occupied by all DMRSs after the first DMRS is configured, the total resource overhead of the DMRS remains unchanged, and the location distribution of the DMRS is different. It is more uniform, which is helpful for more accurate time-domain difference channel estimation.

Fifth, the uplink symbols occupied by the first DMRS are not limited to the last one or more of the uplink symbols of the first time unit, but are predefined positions or any positions dynamically indicated by the first indication information. The number of the second DMRS does not change, and the positions of the first DMRS and the second DMRS are evenly distributed on consecutive time units. At this time, the configuration position of the first DMRS is more flexible, the total number of DMRSs increases, and the positional distribution of the total DMRSs is also more uniform, which is helpful for more accurate time-domain difference channel estimation.

Sixth, the uplink symbol occupied by the first DMRS is not limited to the last one or more uplink symbols of the first time unit, but is a predefined position or an arbitrary position dynamically indicated by the first indication information, the number of the second DMRS. The corresponding reduction means that the number of uplink symbols occupied by the DMRS reduced by the second DMRS is the same as the number of uplink symbols occupied by the configured first DMRS. The first DMRS and the second DMRS are evenly distributed over consecutive time units. For example, each first DMRS and each second DMRS occupy one uplink symbol, the number of the first DMRS is 1, and the number of the preamble DMRS or the additional DMRS can be correspondingly reduced by 1. At this time, the number of uplink symbols occupied by the second DMRS in the original configuration is the same as the number of uplink symbols occupied by all DMRSs after the first DMRS is configured, the total resource overhead of the DMRS remains unchanged, and the configuration position of the first DMRS more flexible.

Seventh, the uplink symbols occupied by the first DMRS are not limited to the last one or more uplink symbols of a time unit, but are predefined positions or any positions dynamically indicated by the first indication information. Neither the number nor the location of the second DMRS is affected. At this time, the configuration position of the first DMRS is more flexible.

In an implementation manner, one or more uplink symbols with the same location may exist in the uplink symbols configured by the network device for the first DMRS and the uplink symbols configured by the network device for the second DMRS. One or more uplink symbols correspond to one of the first DMRS or the second DMRS. For the terminal device, the terminal device may configure the first DMRS on one or more uplink symbols at the same location, but not configure the second DMRS, or the terminal device may configure one or more uplink symbols at the same location. The second DMRS is configured on the above, but the first DMRS is not configured.

A possible implementation of the uplink symbol occupied by the first DMRS on the first time unit is described in the above embodiment. For other time units configured with one or more time units of the first DMRS, the position of the uplink symbol occupied by the first DMRS is Similar to the first time unit.

Different uplink transmissions may correspond to different time units. The following describes different uplink transmissions of the present application in combination with several implementation manners of time units in different situations.

Implementation method one

For the TDD mode, the time unit may be a time slot, the first time unit may be an S time slot, the at least one second time unit may be a U time slot, and the continuous time unit may correspond to a PUSCH transmission, Repeated transmission of PUSCH and/or transmission of different PUSCH. For example, the continuous time unit may be SU, SUU or SUUU or the like. For the case where the continuous time unit is one S time slot and one U time slot (hereinafter referred to as SU), the first DMRS can be configured only on the S time slot, or the first DMRS can be configured on both the S time slot and the U time slot. . For the case where the continuous time unit is one S slot and two U slots (hereinafter referred to as SUU), the first DMRS can be configured only on the S slot, and the first DMRS can be configured only on the S slot and the first U next to S. The first DMRS is configured on the time slot, and the first DMRS may also be configured on both the S time slot and the two U time slots, that is, the first DMRS is configured on all other time slots except the last U time slot. For the case where the continuous time unit is one S time slot and three U time slots (hereinafter referred to as SUUU), the first DMRS can be configured only in the S time slot, and the first DMRS can be configured only in the S time slot and the first U time slot. A DMRS, the first DMRS can be configured only on the S time slot, the first U time slot and the second U time slot, that is, the first DMRS is configured on all other time slots except the last U time slot, The first DMRS may also be configured on the S slot and the three U slots. Specifically, in the TDD mode, the continuous time unit may correspond to one PUSCH transmission, multiple PUSCH repeated transmissions, multiple PUSCH retransmissions, and/or multiple different PUSCH transmissions. When the S time slot cannot be used for PUSCH transmission, only the uplink DMRS is transmitted in the S time slot, and one or more uplink time slots that are continuous with the S time slot are used for PUSCH transmission. At this time, the uplink transmission on the S time slot and the Different from upstream transmission on one or more upstream time slots that are consecutive to the S time slot.

Figures 6 and 7 show an example in which the continuous time unit is SU in the TDD mode. As shown in FIG. 6 , the number of the first DMRS is 1, which occupies the last uplink symbol in the uplink symbols of the S time slot. As shown in FIG. 7 , the first DMRS occupies the last two uplink symbols in the uplink symbols of the S time slot. At this time, it can be understood that two first DMRSs are configured, and each first DMRS occupies one uplink symbol. It is understood that one first DMRS is configured, and one first DMRS occupies two uplink symbols.

Figure 8 shows an example in which the continuous time unit is SUU in the TDD mode. It can be seen that in FIG. 8 only the first DMRS is configured in the S time slot, and the number of the first DMRS is 1, which occupies the last uplink symbol in the uplink symbols of the S time slot.

FIG. 9 shows another example in which the continuous time unit is SUU in the TDD mode. In FIG. 9, the first DMRS is configured on other time units except the last time unit, that is, the first DMRS is configured on the S time slot and the first U time slot, and the last U time slot is configured with the first DMRS. The first DMRS is not configured, and the first DMRS occupies the last uplink symbol in the uplink symbols of the current time slot.

Wherein, since the first DMRS is configured, the pre-DMRS and the additional DMRS on the continuous time unit can be configured according to the pattern example in the configuration parameters, or can be evenly distributed on the entire continuous time unit based on the first DMRS .

In the TDD mode, the network device (access network device or core network device) configures the first DMRS on the S time slot, and instructs the terminal device to send uplink information using the same transmission parameters in consecutive time units, where the uplink parameters include At least one of the same transmit power, the same precoding, and the same antenna port. Based on the first DMRS, the network device performs channel estimation on all DMRSs in the continuous time unit, thereby demodulating and decoding multiple uplink transmissions in the continuous time unit. For the repeated transmission of PUSCH of type A, when the time domain symbols of one PUSCH repeated transmission are more than 4, the S time slot cannot be used for PUSCH transmission. At this time, the uplink resources of the S time slot are used to configure the first DMRS, The uplink resources of the S time slot are efficiently used, and at the same time, the accuracy of channel estimation is improved, and the correct rate of demodulation and decoding of valid data at the receiving end is also improved.

Implementation method two

For the FDD mode, the time unit may be a time slot, the first time unit may be a U time slot, the at least one second time unit may be a U time slot, and correspondingly, the consecutive inter-units may be Two U time slots (hereinafter referred to as UU) may also be more than two consecutive U time slots, for example, three U time slots (hereinafter referred to as UUU). Similar to the TDD mode, for the case where the continuous time unit is two or more consecutive U time slots, the first DMRS can be configured only on the first U The first DMRS is configured on other U time slots, and the first DMRS may also be configured on all U time slots. For example, the continuous time unit is UU, the first DMRS may be configured only on the first U slot, or the first DMRS may be configured on both U slots. For example, if the continuous time unit is UUU, the first DMRS can be configured only on the first U time slot, and the first DMRS can be configured on other U time slots except the last U time slot, that is, the first U time slot can be configured with the first DMRS. The first DMRS is configured on the second U-slot and the second U-slot, or the first DMRS may be configured on all of the three U-slots.

Figures 10 and 11 show two examples in which the continuous time unit is a UU in the FDD mode. In FIG. 10 , the number of the first DMRS is 1, which occupies the last uplink symbol in the uplink symbols of the U time slot. In FIG. 11 , the first DMRS occupies the last two uplink symbols in the uplink symbols of the U time slot. At this time, it can be understood that two first DMRSs are configured, and each first DMRS occupies one uplink symbol, which can also be understood as One first DMRS is configured, and one first DMRS occupies two uplink symbols.

Fig. 12 shows an example in which the continuous time unit is UUU in the FDD mode. In Fig. 12, the first DMRS is configured on all U slots except the last U slot, and the number of the first DMRS is 1. Occupy the last upstream symbol in the upstream symbols of the current time slot.

Wherein, since the first DMRS is configured on the continuous time unit, for the pre-DMRS and the additional DMRS on the continuous time unit, optionally, the configuration can be performed according to the pattern in the configuration parameters, or based on the first DMRS, Evenly distributed over the entire continuous time unit.

Specifically, in the FDD mode, the continuous time unit may correspond to one PUSCH transmission, multiple PUSCH repeated transmissions, multiple PUSCH retransmissions, and/or multiple different PUSCH transmissions.

Implementation method three

The time unit may be a time domain duration corresponding to one PUSCH transmission, or an uplink symbol occupied by one uplink transmission. Specifically, for a case where one PUSCH transmission corresponds to K uplink symbols, the time unit at this time is the K uplink symbols, and the first DMRS occupies the last bit or last multiple uplink symbols of the K uplink symbols. Consecutive time units may be repeated transmissions of multiple PUSCHs and/or transmissions of multiple different PUSCHs. Further, for the time unit in which the first DMRS is configured, the configuration of the second DMRS may not be affected by the first DMRS, or may be uniformly distributed on the first time unit based on the first DMRS. The network device can perform joint channel estimation on all DMRSs in continuous time units, so as to demodulate and decode valid data in uplink transmission.

The following are examples of possible situations where the time unit is the time-domain duration of one PUSCH transmission, and the PUSCH is repeated transmission:

First, for the case where the time domain duration corresponding to one PUSCH repeated transmission is relatively large, there may only be less than or equal to one complete PUSCH transmission in one time slot, or two or more time slots can correspond to one complete PUSCH transmission. For uplink transmission, due to the large time domain length of PUSCH transmission, the first DMRS can be configured on each time unit of the continuous time unit, or it can be used on other time units except the last time unit on the continuous time unit. Configuring the first DMRS, for the case where the first DMRS is configured on other time units other than the last time unit on the continuous time unit, it can also be understood that the configuration of the first DMRS is used for the current uplink transmission and the next uplink transmission. Joint channel estimation. For example, as shown in Figure 13, one uplink transmission corresponds to 10 uplink symbols, the number of repeated transmissions is 4, one time slot contains 14 uplink symbols, and one time slot corresponds to only one complete uplink transmission. The first DMRS is configured on time units corresponding to other PUSCH transmissions other than one PUSCH repeated transmission. For example, as shown in Figure 14, one uplink transmission corresponds to 21 uplink symbols, and the number of repeated transmissions is 2. At this time, only two time slots can correspond to a complete uplink transmission, which can be used in other PUSCHs except the last PUSCH repeated transmission. The first DMRS is configured on the time unit corresponding to the repeated transmission.

Second, for a case where the time domain duration corresponding to one PUSCH repeated transmission is small, there may be multiple PUSCH repeated transmissions in one time slot. Since the time domain length of PUSCH transmission is small, in order to avoid pilot overhead If it is too large, the first DMRS can be configured only on the first time unit. For example, as shown in FIG. 15 , one PUSCH transmission corresponds to 5 uplink symbols. At this time, one time slot can correspond to multiple uplink transmissions. Taking three repeated transmissions as an example, the first DMRS can be configured only in the first uplink transmission among the three repeated PUSCH transmissions, and the second uplink transmission is not configured for the other two uplink transmissions. A DMRS, that is, only the DMRS is configured on the first time unit, and the first DMRS does not need to be configured on at least one second time unit. The uplink data transmitted by the PUSCH repeatedly is demodulated and decoded.

In different embodiments, uplink transmission on continuous time units may correspond to different service types. The following are several examples of uplink transmission when the first indication information is carried in different signaling:

Example 1

The transmission type corresponding to the uplink transmission may be the uplink transmission of the configuration authorization. Optionally, the first indication information is carried in RRC signaling and/or DCI.

Specifically, for the type 1 uplink configuration authorization, when the terminal device uses the type 1 uplink configuration authorization to send uplink service data, it can directly use the parameters configured by the network device, and no additional scheduling information is required. At this time, the first indication information may be carried in the RRC signaling, for example, a parameter is configured in the RRC signaling to instruct the terminal device to configure the first DMRS. For the uplink configuration grant of type 2, the first indication information is carried in RRC signaling and DCI.

Example 2

The transmission type corresponding to the uplink transmission may be dynamically authorized uplink transmission, optionally, the first indication information is carried in the downlink control information DCI, and further optionally, the format of the DCI may be 0_1. For example, the network device dynamically instructs the terminal device to configure the first DMRS through a 1-bit indication field in the DCI format of 0_1, and instructs the terminal device to use the same transmission parameters to perform uplink transmission on continuous time units.

Example three

The transmission type corresponding to the uplink transmission may be repeated transmission of the third message in the random access process. Optionally, the first indication information is carried in DCI, and the format of the DCI may be 0_0. For example, the network device dynamically instructs the terminal device to configure the first DMRS through a 1-bit indication field in the DCI with the format 0_0, and instructs the terminal device to use the same transmission parameters to perform uplink transmission in continuous time units.

Example four

The transmission type corresponding to the uplink transmission may be repeated transmission of the third message in the random access process. Optionally, the first indication information is carried in the PDSCH indicating the uplink grant. For example, the network device dynamically instructs the terminal device to configure the first DMRS through a 1-bit indication field in the PDSCH indicating the uplink grant, and instructs the terminal device to use the same transmission parameter to perform uplink transmission on consecutive time units.

It should be noted that the sequence of execution of steps S301 to S305 described with reference to FIG. 3 is only an exemplary description, and is not intended to limit the present application.

FIG. 16 is a schematic structural diagram of a possible communication apparatus provided by an embodiment of the present application. The communication apparatus 1600 can implement the functions of the network device in the above method embodiments, and thus can also achieve the beneficial effects of the above method embodiments. In this embodiment of the present application, the communication apparatus may be the access network device 120 shown in FIG. 1 , or may be a module (eg, a chip) applied to the access network device.

As shown in FIG. 16 , the communication device 1600 includes a transceiver unit 1601 and a processing unit 1602 . The communication apparatus 1600 may be used to implement the functions of the network device in the method embodiment shown in FIG. 3 above.

Specifically, the transceiver module 1601 is used to send first indication information to the terminal device, where the first indication information is used to instruct the terminal device to configure the first DMRS on the first time unit, and the first indication information is also used to instruct the terminal Multiple uplink transmissions of the device in the first time unit and at least one second time unit satisfy at least one of the same transmit power, the same precoding, and the same antenna port. The transceiver unit 1601 is further configured to receive multiple uplink transmissions from the terminal device in the first time unit and at least one second time unit. The processing unit 1602 is configured to demodulate and decode the multiple uplink transmissions.

In an implementation manner, the first time unit and the at least one second time unit are consecutive time units in the time domain.

In an implementation manner, the first indication information includes a first field, and the first field instructs the terminal device to configure the first DMRS on the first time unit; the first field is also used to instruct the terminal device to Multiple uplink transmissions on the first time unit and at least one second time unit satisfy at least one of the following: use the same transmit power; use the same precoding; or use the same antenna port.

In an implementation manner, the first indication information is carried in the DCI, and the transceiver module 1601 is further configured to send second indication information to the terminal device, where the second indication information is used to indicate that the terminal device has the ability to configure the first DMRS, the The second indication information is carried in the radio resource control RRC signaling.

FIG. 17 is a schematic structural diagram of a possible communication apparatus provided by an embodiment of the present application. The communication apparatus 1700 can implement the functions of the terminal device in the above method embodiments, and thus can also achieve the beneficial effects of the above method embodiments. In this embodiment of the present application, the communication apparatus may be the terminal device 110 shown in FIG. 1 , or may be a module (eg, a chip) applied to the terminal device.

As shown in FIG. 17 , the communication apparatus 1700 includes a transceiver module 1701 , and optionally, a processing module 1702 . The communication apparatus 1700 may be used to implement the functions of the terminal device in the method embodiment shown in FIG. 3 above.

Specifically, the transceiver module 1301 is configured to receive first indication information from a network device, where the first indication information is used to instruct the terminal device to configure the first DMRS on the first time unit, and the first indication information is also used to indicate Multiple uplink transmissions of the terminal device in the first time unit and at least one second time unit satisfy at least one of the same transmit power, the same precoding, and the same antenna port. Optionally, the communication apparatus 1700 may further include a processing module 1702, and the processing module 1702 is configured to configure the first DMRS on the first time unit according to the first indication information. The transceiver module 1702 is also configured to perform multiple uplink transmissions on the first time unit and at least one second time unit, and the multiple uplink transmissions on the first time unit and at least one second time unit satisfy the same transmit power, At least one of the same precoding, and the same antenna port.

Optionally, the processing unit is further configured to confirm that when the first field of the first indication information is confirmed, the multiple uplink transmissions of the terminal device in the first time unit and at least one second time unit satisfy the requirement. At least one of the following:

use the same transmit power;

use the same precoding;

use the same antenna port;

The first field indicates that the terminal device configures the first DMRS on the first time unit.

For more detailed description of the above-mentioned transceiver unit 1601 , transceiver module 1702 , processing unit 1602 and processing module 1702 , reference may be made to the relevant descriptions in the foregoing method embodiments, which are not described herein again. The above-mentioned hardware element of the transceiver unit 1601 or the transceiver module 1701 may be a transceiver, and the hardware element of the processing unit 1602 or the processing module 1702 may be a processor.

FIG. 18 is a schematic structural diagram of a possible communication apparatus provided by an embodiment of the present application. The communication apparatus 1800 includes a processor 1801 and an interface circuit 1802 . The processor 1801 and the interface circuit 1802 can be connected through a bus 1803 . It can be understood that the interface circuit 1802 is a transceiver or an input-output interface. Optionally, the communication device 1800 may further include a memory for storing instructions executed by the processor 1801 or input data required by the processor 1801 to execute the instructions or data generated after the processor 1801 executes the instructions.

When the communication apparatus 1800 is used to implement the methods in the foregoing method embodiments, the processor 1801 is used to execute the functions of the foregoing processing module 1702 or the processing unit 1602, and the interface circuit 1802 is used to execute the functions of the foregoing transceiving module 1701 or transceiving unit 1601.

When the above communication apparatus 1800 is a chip applied to a terminal device, the terminal device chip implements the functions of the terminal device in the above method embodiments. The terminal device chip receives information from other modules (such as a radio frequency module or an antenna) in the terminal device, and the information is sent by the network device to the terminal device; or, the terminal device chip sends information to other modules (such as a radio frequency module or an antenna) in the terminal device antenna) to send information, the information is sent by the terminal equipment to the network equipment.

When the foregoing communication apparatus 1800 is a chip applied to a network device, the network device chip implements the functions of the network device in the foregoing method embodiments. The network device chip receives information from other modules (such as a radio frequency module or an antenna) in the network device, and the information is sent by the terminal device to the network device; or, the network device chip sends information to other modules in the network device (such as a radio frequency module or an antenna). antenna) to send information, the information is sent by the network equipment to the terminal equipment.

It can be understood that the processor in the embodiments of the present application may be a central processing unit (central processing unit, CPU), and may also be other general-purpose processors, digital signal processors (digital signal processors, DSP), application-specific integrated circuits (application specific integrated circuit, ASIC), field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. A general-purpose processor may be a microprocessor or any conventional processor.

In this embodiment of the present application, the terminal device or the network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. This hardware layer includes hardware such as central processing unit (CPU), memory management unit (MMU), and memory (also called main memory). The operating system may be any one or more computer operating systems that implement business processing through processes, such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a Windows operating system. The application layer includes applications such as browsers, address books, word processing software, and instant messaging software. In addition, the embodiments of the present application do not specifically limit the specific structure of the execution body of the methods provided by the embodiments of the present application, as long as the program that records the codes of the methods provided by the embodiments of the present application can be executed to provide the methods provided by the embodiments of the present application. For example, the execution subject of the method provided by the embodiment of the present application may be a terminal device or a network device, or a functional module in the terminal device or network device that can call and execute a program.

Additionally, various aspects or features of the present application may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used in this application encompasses a computer program accessible from any computer readable device, carrier or medium. For example, computer readable media may include, but are not limited to: magnetic storage devices (eg, hard disks, floppy disks, or magnetic tapes, etc.), optical disks (eg, compact discs (CDs), digital versatile discs (DVDs) etc.), smart cards and flash memory devices (eg, erasable programmable read-only memory (EPROM), card, stick or key drives, etc.). Additionally, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and/or carrying instructions and/or data.

FIG. 19 is a schematic structural diagram of a network device provided by an embodiment of the present application, which may be, for example, a schematic structural diagram of a base station. The base station 2000 can be applied to the system shown in FIG. 1 , and performs the functions of the network device in the foregoing method embodiments. As shown in the figure, the base station 2000 may include at least one antenna 2101 and at least one radio frequency unit 2102 . Optionally, the transceiver unit 2100 may include a receiving unit and a sending unit, the receiving unit may correspond to a receiver (or called a receiver, a receiving circuit), and the sending unit may correspond to a transmitter (or called a transmitter, a sending circuit).

It should be understood that the base station 2000 shown in FIG. 19 can implement various processes involving network devices in the foregoing method embodiments. The operations or functions of each module in the base station 2000 are respectively to implement the corresponding processes in the foregoing method embodiments. For details, reference may be made to the descriptions in the foregoing method embodiments, and to avoid repetition, the detailed descriptions are appropriately omitted here.

FIG. 20 is a schematic structural diagram of a terminal device 3000 provided by an embodiment of the present application. As shown in the figure, the terminal device 3000 includes a processor 3001 and a transceiver 3002 . Optionally, the terminal device 3000 may further include a memory 3003 . Among them, the processor 3001, the transceiver 3002 and the memory 3003 can communicate with each other through an internal connection path to transmit control and/or data signals. The computer program is invoked and executed to control the transceiver 3002 to send and receive signals.

The above-mentioned processor 3001 and the memory 3003 can be combined into a processing device 3004, and the processor 3001 is configured to execute the program codes stored in the memory 3003 to realize the above-mentioned functions. It should be understood that the processing device 3004 shown in the figure is merely an example. During specific implementation, the memory 3003 may also be integrated in the processor 3001 or independent of the processor 3001 . This application does not limit this.

The above-mentioned terminal device 3000 may further include an antenna 3010 for transmitting the uplink data or uplink control signaling output by the transceiver 3002 through wireless signals.

It should be understood that the terminal device 3000 shown in FIG. 16 can implement various processes related to the terminal device in the foregoing method embodiments. The operations or functions of each module in the terminal device 3000 are respectively to implement the corresponding processes in the foregoing method embodiments. For details, reference may be made to the descriptions in the foregoing method embodiments, and to avoid repetition, the detailed descriptions are appropriately omitted here.

Optionally, the above-mentioned terminal device 3000 may further include a power supply 3005 for providing power to various devices or circuits in the terminal device.

In addition, in order to make the functions of the terminal device more complete, the terminal device 3000 may further include one or more of an input unit 3006, a display unit 3007, an audio circuit 3008, a camera 3009, a sensor 3008, etc., the audio circuit A speaker 30081, a microphone 30082, etc. may also be included.

It should be understood that the processing device may be a chip. For example, the processing device may be a field programmable gate array (FPGA), a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC) , off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, can also be system on chip (system on chip, SoC), can also be central processing It can be a central processor unit (CPU), a network processor (NP), a digital signal processing circuit (DSP), or a microcontroller (MCU) , it can also be a programmable logic device (PLD) or other integrated chips. The methods, steps, and logic block diagrams disclosed in the embodiments of this application can be implemented or executed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature in the art. The storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above method in combination with its hardware.

The memory 3003 may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically programmable Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory. Volatile memory may be random access memory (RAM), which acts as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (synchlink DRAM, SLDRAM) ) and direct memory bus random access memory (direct rambus RAM, DR RAM).

It should be noted that the memory of the systems and methods described herein is intended to include, but not be limited to, these and any other suitable types of memory.

The present application further provides a computer program product, the computer program product includes: computer program code, when the computer program code is run on a computer, the computer is made to execute any of the foregoing method embodiments by a terminal device or a network device. Methods.

The present application also provides a computer-readable medium, where program codes are stored in the computer-readable medium, and when the program codes are run on a computer, the computer is made to perform the method performed by the network device or the terminal device in the foregoing method embodiments .

The present application also provides a system, which includes at least one terminal device and at least one network device.

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented in 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 instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general purpose computer, special purpose computer, computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server or data center Transmission to another website site, computer, server, or data center by wire (eg, coaxial cable, optical fiber, digital subscriber line, DSL) or wireless (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes an integration of one or more available media. The available media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, high-density digital video discs (DVDs)), or semiconductor media (eg, solid state discs, SSD)) etc.

The terms "component", "module", "system" and the like are used in this specification to refer to a computer-related entity, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component may be, but is not limited to, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, or a computer. By way of illustration, both an application running on a computing device and the computing device may be components. One or more components may reside within a process or thread of execution, and a component may be localized on one computer or distributed among 2 or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. A component may, for example, pass a signal through a local system based on a signal having one or more data packets (such as data from two components interacting with another component between a local system, a distributed system, or a network, such as the Internet interacting with other systems through signals). or remote process to communicate.

It is to be understood that reference throughout the specification to an "embodiment" means that a particular feature, structure, or characteristic associated with the embodiment is included in at least one embodiment of the present application. Thus, various embodiments throughout this specification are not necessarily necessarily referring to the same embodiment. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments.

It should be understood that, in the embodiments of the present application, the numbers "first", "second"... are only used to distinguish different objects, such as to distinguish different network devices, and do not limit the scope of the embodiments of the present application. The example is not limited to this.

It should also be understood that in this application, "when", "if" and "if" all mean that the network element will make corresponding processing under certain objective circumstances, not a limited time, and does not require the network element There must be a judgmental action during implementation, and it does not mean that there are other restrictions.

It should also be understood that, in this application, "at least one" refers to one or more, and "a plurality" refers to two or more.

It should also be understood that, in each embodiment of the present application, "B corresponding to A" indicates that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean that B is only determined according to A, and B may also be determined according to A and/or other information.

It should also be understood that the term "and/or" in this document is only an association relationship for describing associated objects, indicating that there can be three kinds of relationships, for example, A and/or B, which can mean that A exists alone, and A and B exist at the same time. B, there are three cases of B alone. In addition, the character "/" in this document generally indicates that the related objects are an "or" relationship.

In this application, meanings similar to the expression "an item includes one or more of the following: A, B, and C" generally means that the item can be any of the following: A; B, unless otherwise specified. ;C;A and B;A and C;B and C;A,B and C;A and A;A,A and A;A,A and B;A,A and C,A,B and B;A , C and C; B and B, B, B and B, B, B and C, C and C; C, C and C, and other combinations of A, B and C. A total of three elements of A, B and C are used as examples above to illustrate the optional items of the item. When the expression is "the item includes at least one of the following: A, B, ..., and X", it means that the expression is in When there are more elements, then the items to which the item can apply can also be obtained according to the preceding rules.

It can be understood that, in the embodiments of the present application, the terminal device and/or the network device may perform some or all of the steps in the embodiments of the present application, these steps or operations are only examples, and the embodiments of the present application may also perform other operations or various Variation of operations. In addition, various steps may be performed in different orders presented in the embodiments of the present application, and may not be required to perform all the operations in the embodiments of the present application.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a removable hard disk, a read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk and other media that can store program codes.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

A communication method, characterized in that the method comprises:

receiving first indication information from the network device, where the first indication information is used to instruct the terminal device to configure the first demodulation reference signal DMRS on the first time unit;

The first indication information is also used to indicate that the multiple uplink transmissions of the terminal equipment in the first time unit and at least one second time unit satisfy at least one of the following:

use the same transmit power;

use the same precoding; or

Use the same antenna port.
The method of claim 1, wherein the first time unit and the at least one second time unit are consecutive time units in the time domain.
The method according to claim 1 or 2, wherein the first DMRS occupies the last M uplink symbols in the uplink symbols of the first time unit, and M is a natural number less than or equal to 4.
The method according to any one of claims 1-3, wherein the first time unit is a flexible time slot or an uplink time slot, and the at least one second time unit is an uplink time slot.
The method according to any one of claims 1-4, wherein the first indication information includes a first field, and the first field instructs the terminal device to configure the first DMRS on the first time unit; When the first indication information includes the first field, the multiple uplink transmissions of the terminal device in the first time unit and at least one second time unit satisfy at least one of the following:

use the same transmit power;

use the same precoding; or

Use the same antenna port.
The method according to any one of claims 1-5, wherein when the position of at least one uplink symbol in the uplink symbol configured for the second DMRS and the uplink symbol configured for the first DMRS is the same, the The at least one uplink symbol with the same location corresponds to one of the first DMRS or the second DMRS, wherein the second DMRS includes a preamble DMRS and/or an additional DMRS.
The method according to any one of claims 1-6, wherein the first indication information is carried in downlink control information DCI, or the first indication information is carried in radio resource control RRC signaling, or, The first indication information is carried in the physical downlink shared channel PDSCH indicating the uplink grant.
The method according to any one of claims 1-6, wherein the first indication information is carried in downlink control information DCI, the method further comprises: receiving second indication information from a network device, the first indication information The second indication information is used to indicate that the terminal device has the capability to configure the first DMRS, and the second indication information is carried in the radio resource control RRC signaling.
A communication method, characterized in that the method comprises:

Send first indication information to the terminal device, where the first indication information is used to instruct the terminal device to configure the first demodulation reference signal DMRS on the first time unit, and the first indication information is also used to instruct the terminal Multiple uplink transmissions performed by the device on the first time unit and at least one second time unit satisfy at least one of the following:

use the same transmit power;

use the same precoding; or

use the same antenna port;

After receiving multiple uplink transmissions from the terminal device on the first time unit and at least one second time unit, demodulate and decode the multiple uplink transmissions.
The method of claim 9, wherein the first time unit and the at least one second time unit are in the time domain.
The method according to claim 9 or 10, wherein the first DMRS occupies the last M symbols in the uplink symbols of the first time unit, and M is a natural number less than or equal to 4.
The method according to any one of claims 9-11, wherein the first time unit is a flexible time slot or an uplink time slot, and the at least one second time unit is an uplink time slot.
The method according to any one of claims 9-12, wherein the first indication information includes a first field, and the first field instructs the terminal device to configure the first DMRS on a first time unit; the The first field is also used to indicate that the multiple uplink transmissions of the terminal device in the first time unit and at least one second time unit satisfy at least one of the following:

use the same transmit power;

use the same precoding; or

Use the same antenna port.
The method according to any one of claims 9-13, wherein the first indication information is carried in downlink control information DCI, or the first indication information is carried in radio resource control RRC signaling, or, The first indication information is carried in the physical downlink shared channel PDSCH indicating the uplink grant.
The method according to any one of claims 9-13, wherein the first indication information is carried in downlink control information DCI, and the method further comprises: sending second indication information to the terminal device, the The second indication information is used to indicate that the terminal device has the capability of configuring the first DMRS, and the second indication information is carried in the radio resource control RRC signaling.
A communication device, comprising:

a transceiver unit, configured to receive first indication information, where the first indication information is used to instruct the terminal device to configure a first demodulation reference signal DMRS on a first time unit; the first indication information is also used to instruct the terminal Multiple uplink transmissions performed by the device on the first time unit and at least one second time unit satisfy at least one of the following:

use the same transmit power;

use the same precoding;

Use the same antenna port.
The apparatus of claim 16, wherein the first time unit and the at least one second time unit are consecutive time units in the time domain.
The apparatus according to claim 16 or 17, wherein the first DMRS occupies the last M uplink symbols in the uplink symbols of the first time unit, and M is a natural number less than or equal to 4.
The apparatus according to any one of claims 16-18, wherein the first time unit is a flexible time slot or an uplink time slot, and the at least one second time unit is an uplink time slot.
The device of any one of claims 16-19, further comprising:

A processing unit, configured to confirm that when the first field of the first indication information is confirmed, the multiple uplink transmissions of the terminal device in the first time unit and at least one second time unit satisfy at least one of the following:

use the same transmit power;

use the same precoding; or

use the same antenna port;

The first field indicates that the terminal device configures the first DMRS on the first time unit.
The apparatus according to any one of claims 16-20, wherein when the uplink symbols configured for the second DMRS and the uplink symbols configured for the first DMRS have the same position of at least one uplink symbol, the The at least one uplink symbol with the same location corresponds to one of the first DMRS or the second DMRS, wherein the second DMRS includes a preamble DMRS and/or an additional DMRS.
The apparatus according to any one of claims 16-21, wherein the first indication information is carried in downlink control information DCI, or, the first indication information is carried in radio resource control RRC signaling, or, The first indication information is carried in the physical downlink shared channel PDSCH indicating the uplink grant.
The apparatus according to any one of claims 16-21, wherein the first indication information is carried in downlink control information DCI, and the method further comprises: receiving second indication information from a network device, the first indication information The second indication information is used to indicate that the terminal device has the capability to configure the first DMRS, and the second indication information is carried in the radio resource control RRC signaling.
A communication device, comprising:

a transceiver unit, configured to send first indication information to the terminal device, where the first indication is used to instruct the terminal device to configure the first DMRS on the first time unit, and the first indication information is also used to instruct the terminal device to Multiple uplink transmissions on the first time unit and at least one second time unit satisfy at least one of the following:

use the same transmit power;

use the same precoding; or

use the same antenna port;

The transceiver unit is further configured to receive multiple uplink transmissions from the terminal device on the first time unit and at least one second time unit;

a processing unit, configured to demodulate and decode the multiple uplink transmissions.
The apparatus of claim 24, wherein the first time unit and the at least one second time unit are consecutive time units in the time domain.
The apparatus according to claim 24 or 25, wherein the first DMRS occupies the last M symbols in the uplink symbols of the first time unit, and M is a natural number less than or equal to 4.
The apparatus according to any one of claims 24-26, wherein the first time unit is a flexible time slot or an uplink time slot, and the at least one second time unit is an uplink time slot.
The apparatus according to any one of claims 25-27, wherein the first indication information includes a first field, and the first field instructs the terminal device to configure the first DMRS on the first time unit; the The first field is also used to indicate that the multiple uplink transmissions of the terminal device in the first time unit and at least one second time unit satisfy at least one of the following:

use the same transmit power;

use the same precoding; or

Use the same antenna port.
The apparatus according to any one of claims 25 to 28, wherein the first indication information is carried in downlink control information DCI, or the first indication information is carried in radio resource control RRC signaling, or, The first indication information is carried in the physical downlink shared channel PDSCH indicating the uplink grant.
The apparatus according to any one of claims 25-28, wherein the first indication information is carried in downlink control information DCI, and the method further comprises: sending second indication information to the terminal device, the The second indication information is used to indicate that the terminal device has the capability of configuring the first DMRS, and the second indication information is carried in the radio resource control RRC signaling.
A communication device, characterized in that it includes at least one processor and an interface circuit, the interface circuit is configured to provide the at least one processor with input or output of instructions and/or data, and the at least one processor executes When the above instruction is executed, the device is caused to implement the method according to any one of claims 1-8.
A communication device, characterized in that it includes at least one processor and an interface circuit, the interface circuit is configured to provide the at least one processor with input or output of instructions and/or data, and the at least one processor executes When the above instruction is executed, the apparatus is caused to implement the method according to any one of claims 9-15.
A readable storage medium, characterized by comprising programs or instructions, when the programs or instructions are executed on a computer, the method according to any one of claims 1-7 or 9-15 is executed.