WO2018127112A1

WO2018127112A1 - Data transmission method and apparatus

Info

Publication number: WO2018127112A1
Application number: PCT/CN2018/071465
Authority: WO
Inventors: 卢亚伟; 张鹏
Original assignee: 华为技术有限公司
Priority date: 2017-01-06
Filing date: 2018-01-04
Publication date: 2018-07-12

Abstract

The present application relates to a data transmission method and apparatus. The method comprises: a first device sending first indication information, wherein the first indication information is used for indicating a time frequency resource of a first reference signal, and the first reference signal is used for carrying out channel estimation on retransmission data of first data; and the first device sending the retransmission data. When a time frequency resource occupied by a reference signal and indicated by the first indication information is less than a time frequency resource occupied by a reference signal and used during first transmission of the first data, the overhead of a reference signal can be saved on, and the flexibility of resource configuration of the reference signal and data transmission efficiency are improved.

Description

Data transmission method and device

This application claims the priority of the Chinese Patent Application filed on January 6, 2017, the Chinese Patent Office, the application number is 201710010473.3, the invention name is "Data Transmission Method and Device", and the Chinese Patent Application is required to be submitted on June 16, 2017. The priority of the Chinese Patent Application No. 201710459563.0, entitled "Data Transmission Method and Apparatus", the entire disclosure of which is incorporated herein by reference.

Technical field

The present invention relates to the field of communications, and in particular, to a data transmission method and apparatus.

Background technique

In a wireless communication system, a Reference Signal (RS), also known as a pilot signal, is a known signal transmitted by a transmitting device to a receiving device on a known resource. The receiving device can obtain channel-related information according to the received reference signal to complete channel estimation or channel measurement. The channel measurement result can be used for resource scheduling and link adaptation, and the channel estimation result can be used by the receiving device to demodulate the data.

Ultra-Reliable and Low-Latency Communications (URLLC) services are an important service in future mobile communication systems. URLLC services typically have very high reliability requirements (eg, 99.999%) and very short latency requirements (eg, 1 ms). In order to improve the reliability of the URLLC service, a hybrid automatic repeat request (HARQ) technique may be employed. A URLLC packet may need to be transmitted multiple times. The interval between the first transmission and the last retransmission generally does not exceed the 1 ms delay required by the URLLC service, as shown in Figure 1.

The current downlink reference signal design scheme in LTE cannot adapt to new services such as URLLC and new application scenarios, and data transmission efficiency is low.

Summary of the invention

The present application provides a data transmission method and apparatus to improve data transmission efficiency. In order to solve the above technical problem, the present application discloses the following technical solutions:

In a first aspect, the embodiment of the present application provides a data transmission method, where the method includes: a first device sends first indication information, where the first indication information is used to indicate a time-frequency resource of a first reference signal, where A reference signal is used for channel estimation of the retransmitted data of the first data, and the first device transmits the retransmitted data.

In the method provided by the first aspect, the first device sends the first indication information, where the first indication information is used to indicate a time-frequency resource of the reference signal when the first data is transmitted in the second or subsequent time, and the time-frequency resource configuration may be The time-frequency resources when the first data is transmitted are the same, and may be different. When the time-frequency resource indicated by the first indication information is smaller than the time-frequency resource occupied by the reference signal when the first data is transmitted for the first time, The overhead of reference signals is saved, and the flexibility of reference signal resource configuration and the efficiency of data transmission are improved.

In addition, since the time interval between the subsequent Nth transmission and the first transmission is short and the channel change is small, configuring the time-frequency resource of the reference signal sparsely than the first transmission does not affect the second as the receiving end. The result of the channel estimation by the device, in turn, ensures the accuracy of the channel estimation while reducing the reference signal overhead.

In conjunction with the first aspect, in a first implementation of the first aspect, the first indication information includes information indicating a time-frequency location of the first reference signal.

With reference to the first implementation of the first aspect, in the second implementation of the first aspect, the information of the time-frequency location includes at least one of a frequency domain interval, a frequency domain offset, a time domain interval, and a time domain offset. In this aspect, the location of the time-frequency resource of the reference signal that is subsequently transmitted may be different from the location of the first transmission, that is, the frequency offset of the reference signal occurs, so that the frequency domain between the first reference signal and the second reference signal is transmitted N times. The locations intersect each other, further improving the accuracy of the channel estimation results of the receiving device.

With reference to the first aspect, in a third implementation of the first aspect, the first indication information is further used to indicate that the first device does not send the first reference signal, that is, the reference signal does not occupy time-frequency resources, and the overhead is minimum. .

With reference to any one of the first to third aspects of the first aspect, in a fourth implementation of the first aspect, the method further includes: transmitting second indication information, where the second indication information is used to indicate The second reference signal is used for performing channel estimation on the first transmission of the first data, where the first indication information and the second indication information may be simultaneously sent, and The second indication information is sent first, for example, the first indication information is sent first, and then the first indication information is sent.

In conjunction with the fourth implementation of the first aspect, in the fifth implementation of the first aspect, the second indication information includes a time-frequency location of the second reference signal.

With reference to the fifth implementation of the first aspect, in the sixth implementation of the first aspect, the information of the time-frequency location includes at least one of a frequency domain interval, a frequency domain offset, a time domain interval, and a time domain offset.

With reference to any one of the fourth to sixth implementations of the first aspect, in the seventh implementation of the first aspect, the time-frequency resource of the first reference signal includes R1 time-frequency resource units, and the second The time-frequency resource of the reference signal includes R2 time-frequency resource units, where R1 is less than or equal to R2, R1 is an integer greater than or equal to zero, and R2 is a positive integer. When R1 is equal to zero, it indicates that the reference signal is not carried during retransmission, and the overhead is zero. At this time, all resources can be used for data transmission, and the reference signal overhead is the smallest.

With the implementation of any one of the first to seventh aspects of the first aspect, in the eighth implementation of the first aspect, the first indication information is implemented by physical layer control signaling, radio resource control layer signaling, and media connection. Any one of the control layer signaling is sent.

With reference to the fourth to seventh implementations of the first aspect, in the ninth implementation of the first aspect, the second indication information passes physical layer control signaling, radio resource control layer signaling, and media access control layer signaling Any one of them is sent.

In a second aspect, the embodiment of the present application provides a data transmission method, where the method includes: receiving, by the second device, first indication information, where the first indication information is used to indicate a time-frequency resource of the first reference signal, where the A reference signal is used for channel estimation of the retransmitted data of the first data, and the second device receives the retransmitted data.

In the method provided by the second aspect, the second device is configured to receive the first indication information, where the first indication information is used to indicate a time-frequency resource of the reference signal when the first data is transmitted in the second or subsequent time, and the time-frequency resource configuration may be The time-frequency resources when the first data is transmitted are the same, and may be different. When the time-frequency resource indicated by the first indication information is smaller than the time-frequency resource occupied by the reference signal when the first data is transmitted for the first time, The overhead of reference signals is saved, and the flexibility of reference signal resource configuration and the efficiency of data transmission are improved.

With reference to the second aspect, in a first implementation of the second aspect, the first indication information includes information indicating a time-frequency position of the first reference signal.

With reference to the first implementation of the second aspect, in a second implementation of the second aspect, the information of the time-frequency location includes at least one of a frequency domain interval, a frequency domain offset, a time domain interval, and a time domain offset.

With reference to the second aspect, in a third implementation of the second aspect, the first indication information is further used to indicate that the first device does not send the first reference signal.

With reference to any one of the first to third aspects of the second aspect, in a fourth implementation of the second aspect, the method further includes: receiving second indication information, where the second indication information is used to indicate A time-frequency resource of the second reference signal, the second reference signal being used for channel estimation of the first transmission of the first data.

With reference to the fourth implementation of the second aspect, in a fifth implementation of the second aspect, the second indication information includes a time-frequency location of the second reference signal.

With reference to the fifth implementation of the second aspect, in the sixth implementation of the second aspect, the information of the time-frequency location includes at least one of a frequency domain interval, a frequency domain offset, a time domain interval, and a time domain offset.

With the implementation of any one of the fourth to sixth aspects of the second aspect, in the seventh implementation of the second aspect, the time-frequency resource of the first reference signal includes R1 time-frequency resource units, and the second The time-frequency resource of the reference signal includes R2 time-frequency resource units, where R1 is less than or equal to R2, R1 is an integer greater than or equal to zero, and R2 is a positive integer. When R1 is equal to zero, it indicates that the reference signal is not carried during retransmission, and the overhead is zero. At this time, all resources can be used for data transmission, and the reference signal overhead is the smallest.

With the implementation of any one of the first to seventh aspects of the second aspect, in the eighth implementation of the second aspect, the second device passes physical layer control signaling, radio resource control layer signaling, media access Any one of the control layer signaling receives the first indication information.

With reference to the fourth to seventh implementations of the second aspect, in the ninth implementation of the second aspect, the second device passes the physical layer control signaling, the radio resource control layer signaling, and the medium access control layer signaling. Any one of the above receives the second indication information.

In a third aspect, the embodiment of the present application provides a first device, where the first device can serve as a sending device, and the device has the functions of implementing the first aspect and the first to ninth method embodiments of the first aspect. . The functions may be implemented by hardware or by corresponding software implemented by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In a possible design, the first device includes an obtaining unit and a sending unit, where the acquiring unit is configured to acquire first indication information, where the first indication information is used to indicate a time-frequency resource of the first reference signal, The first reference signal is used for performing channel estimation on the retransmission data of the first data, and the sending unit is configured to send the first indication information, where the sending unit is further configured to send the retransmitted data.

In a possible design, the transmitting unit is further configured to implement the functions implemented by the transmitting unit in the first to ninth method embodiments of the first aspect.

In a fourth aspect, the embodiment of the present application provides a second device, where the second device can serve as a receiving device, and the device has the functions of implementing the second aspect and the first to ninth method embodiments of the second aspect. . The functions may be implemented by hardware or by corresponding software implemented by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In a possible design, the second device includes: a receiving unit and a processing unit, wherein: the receiving unit is configured to receive first indication information, where the first indication information is used to indicate a time frequency of the first reference signal The first reference signal is used for performing channel estimation on the retransmission data of the first data, and the processing unit is configured to determine a time-frequency resource of the first reference signal according to the first indication information; And is further configured to receive the retransmitted data.

In a possible design, the receiving unit is further configured to implement the functions implemented by the receiving unit in the first to ninth method embodiments of the second aspect.

In a fifth aspect, an embodiment of the present invention provides a first device, where the first device can serve as a sending device. The first device includes a processor and a transmitter, the processor configured to support a first device to implement a function of an acquisition unit in an embodiment of a third aspect, the transmitter configured to implement transmission in a third aspect embodiment The function of the unit. The first device can also include a memory for coupling with a processor that retains program instructions and data necessary for the first device.

In a sixth aspect, an embodiment of the present invention provides a second device, where the second device can serve as a receiving device. The second device includes a processor and a transceiver configured to support a second device to implement the functions of the processing unit in the fourth aspect, the transceiver being configured to implement the receiving in the fourth aspect The function of the unit. The second device can also include a memory for coupling with the processor that retains the program instructions and data necessary for the second device.

In a seventh aspect, the embodiment of the present application further provides a computer storage medium, where the computer storage medium stores a program, where the program may be executed in the implementation manners of the first aspect and the second aspect data transmission method. Some or all of the steps.

In an eighth aspect, a computer program product comprising instructions, when executed on a computer, causes the computer to perform the method of the first aspect or any of the possible implementations of the first aspect.

In a ninth aspect, a computer program product comprising instructions, when executed on a computer, causes the computer to perform the method of any of the second aspect or the second aspect of the second aspect.

The data transmission method and device provided by the application, the transmission device indicates the time-frequency resource of the reference signal used for data transmission, thereby improving the flexibility of the time-frequency resource configuration of the reference signal and the efficiency of data transmission, and adapting to the new URLLC and the like. Business and application scenarios. In addition, the frequency domain interval of the reference signal in the frequency domain is increased, thereby reducing the overhead of the time-frequency resource occupied by the reference signal, and improving the efficiency of data transmission; and indicating that the reference signal is frequency-domain biased by the first indication information. The shifting causes the frequency domain positions of the reference signals used for the first transmission of data and the retransmission of data to cross each other, further improving the accuracy of the estimated signal of the receiving device.

DRAWINGS

FIG. 1 is a schematic diagram of a URLLC service user transmission delay according to an embodiment of the present disclosure;

2 is a schematic diagram of a scenario of a communication system applied to a data transmission method according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a reference signal time-frequency resource according to an embodiment of the present disclosure;

4 is a schematic flowchart of a data transmission method according to an embodiment of the present application;

FIG. 5 is a schematic diagram of a frequency domain interval increase of a reference signal when a first data is retransmitted and a reference signal when the first data is initially transmitted according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a frequency domain offset of a reference signal when a first data is retransmitted and a reference signal when the first data is initially transmitted according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of indicating that subsequent transmission does not carry a reference signal according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of a time-frequency resource indicating a subsequent reference signal according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of a reference signal indication based on feedback information according to an embodiment of the present disclosure;

FIG. 10 is a schematic diagram of another reference signal indication according to an embodiment of the present disclosure;

FIG. 11 is a schematic flowchart diagram of another data transmission method according to an embodiment of the present disclosure;

FIG. 11A is a schematic diagram of multiplexing a reference signal according to an embodiment of the present application; FIG.

FIG. 12 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present application;

FIG. 13 is a schematic structural diagram of a first device according to an embodiment of the present disclosure;

FIG. 14 is a schematic structural diagram of a second device according to an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application are clearly and completely described in the following with reference to the accompanying drawings in the embodiments.

Embodiments of the present application are applied to a communication system composed of at least one first device as a transmitting device and at least one second device as a receiving device. The transmitting device and the receiving device may be any one of a transmitting end device and a receiving end device that perform data transmission in a wireless manner. The transmitting device and the receiving device may be any device having a wireless transceiving function, including but not limited to: a base station NodeB, an evolved base station eNodeB, a base station in a fifth generation (5G) communication system, and a future communication system. The base station or network device, the access node in the WiFi system, the wireless relay node, the wireless backhaul node, and the user equipment (UE).

The UE may also be referred to as a terminal terminal, a mobile station (MS), a mobile terminal (MT), a remote terminal (RT), an access terminal (AT), and a user. User agent (UA), etc. The UE may communicate with one or more core networks via a radio access network (RAN), or may access the distributed network in an ad hoc or unlicensed manner, and the UE may also access the wireless network through other means. For the communication, the UE can also directly perform wireless communication with other UEs, which is not limited in this embodiment of the present invention.

The data transmission method provided by the embodiments of the present application can be applied to downlink data transmission, and can also be applied to uplink data transmission, and can also be applied to device to device (D2D) data transmission. For downlink data transmission, the transmitting device is a base station, and the corresponding receiving device is a UE. For uplink data transmission, the transmitting device is a UE, and the corresponding receiving device is a base station. For data transmission of D2D, the transmitting device is a UE, and the corresponding receiving device is also a UE. The embodiment of the present invention does not limit this.

The transmitting device and the receiving device in various embodiments of the present application may be deployed on land, including indoors or outdoors, handheld or on-board; or may be deployed on the water; or may be deployed on aircraft, balloons, and satellites in the air. The UE in the embodiment of the present invention may be a mobile phone, a tablet, a computer with a wireless transceiver function, a virtual reality (VR) terminal device, and an augmented reality (AR) terminal device. Wireless terminal in industrial control, wireless terminal in self driving, wireless terminal in remote medical, wireless terminal in smart grid, transportation safety A wireless terminal in a wireless terminal, a wireless terminal in a smart city, a wireless terminal in a smart home, and the like.

The data transmission method provided in the embodiments of the present application can be applied to various communication systems, such as 4G, 4.5G, and 5G systems, and the application scenario is not limited.

As shown in FIG. 2, this embodiment provides a communication system scenario applied to the data transmission method, where the application scenario includes a base station and at least one terminal device. The base station may be a node in the cellular network that provides a data access service for the terminal device, and the terminal device may be various UEs in the cellular network that communicate with the base station.

The data transmission method provided in this embodiment can be applied to the transmission of data such as a URLLC service and an eMBB service. In the URLLC service, the time interval between the first transmission and the retransmission of the data is short, and generally does not exceed 1 ms delay. In the process of data transmission, the channel variation is small. Based on this feature, the indication information indicates the time-frequency resource of the reference signal during data transmission, thereby providing flexibility in resource allocation and improving data transmission efficiency.

3 is a schematic diagram of a time-frequency resource of a reference signal, wherein a plurality of (for example, 84) resource elements (REs) are included in a physical resource block (PRB), and each RE Can be used to carry a reference signal symbol. Figure 3 illustrates the number and location of reference signal symbols arranged in a PRB of a slot, wherein in the first time domain symbol, two adjacent reference signal symbols are separated by six subcarriers ( 5 RE), the reference signal symbol in the third last time domain symbol and the reference signal symbol in the first time domain symbol are spaced apart by 3 subcarriers in the frequency domain. The time domain symbol here may be an orthogonal frequency division multiplexing (OFDM) symbol, or may be a single carrier frequency division multiple access (SC-FDMA) symbol.

Further, the method provided in this embodiment includes the following steps:

As shown in FIG. 4, the first device sends a first indication information, where the first indication information is used to indicate a time-frequency resource of the first reference signal, where the first reference signal is used to weight the first data. The data is transmitted for channel estimation.

Optionally, the first device sends the second indication information, where the second indication information is used to indicate a time-frequency resource of the second reference signal, and the second reference signal is used to perform a channel for the first transmission of the first data. estimate.

Optionally, the time-frequency resource of the first reference signal includes R1 time-frequency resource units, and the time-frequency resource of the second reference signal includes R2 time-frequency resource units, where R1 is less than or equal to R2, and R1 is greater than An integer equal to zero, and R2 is a positive integer. The time-frequency resource unit here can be an RE.

The first device may send the first indication information and the second indication information at the same time, or may send the second indication information, for example, first sending the second indication information, and then sending the first indication information, which is not used in this embodiment. limited.

Step 102: The first device sends the retransmission data.

The first indication information and the second indication information may be in physical layer control signaling, radio resource control (RRC) layer signaling, and medium access control (MAC) layer signaling. Any kind of transmission. The physical layer control signaling has the highest real-time performance, but the signaling overhead is large. The RRC layer signaling overhead is the smallest, but the delay is the largest. Specifically, the signaling of the first indication information and/or the second indication information is performed by using one of the foregoing three types of signaling, which may be determined according to requirements and application scenarios.

Specifically, in step 101, the first device sends first indication information, where the first indication information includes information indicating a time-frequency position of the first reference signal, where the information of the time-frequency location includes a frequency domain. At least one of an interval, a frequency domain offset, a time domain interval, and a time domain offset.

The first indication information indicates that the time-frequency position of the first reference signal has two ways. One is an absolute indication, that is, directly indicating the time-frequency position of the first reference signal in one resource block, for example, can be indicated by three dimensions: when the first reference signal symbol is in one RB The frequency position, the frequency domain interval between two adjacent reference signal symbols, and the time domain interval between two adjacent reference signal symbols, wherein the frequency domain interval is the RE number, and the time domain interval is the time domain The number of symbols. The second type is a relative indication manner, that is, indicating a change of the first reference signal relative to the time-frequency position of the second reference signal, and specifically indicating at least one of the following: the amount of change of the frequency domain interval, and the offset in the frequency domain The amount of shift, the variation of the time domain interval, and the time domain offset.

Configuration mode 1: When the retransmission is configured, the frequency domain interval of the reference signal increases.

FIG. 5 is a schematic diagram showing an increase in frequency domain spacing of a reference signal when the first data is retransmitted and a reference signal when the first data is initially transmitted. When the first data is initially transmitted, the positions of two adjacent reference signal symbols in the same time domain symbol are separated by 1 RE; when retransmitting, the interval between adjacent two reference signal symbols is 3 RE, thereby making The time-frequency resource occupied by the reference signal during retransmission is reduced, which saves overhead.

Configuration mode 2: Configure the frequency domain offset of the reference signal when retransmission is configured.

FIG. 6 is a schematic diagram showing a frequency domain offset of a reference signal when the first data is retransmitted and a reference signal when the first data is initially transmitted. The first reference signal symbol sent by the first device is offset by an RE in the frequency domain compared to the second reference signal symbol, so that the retransmitted reference signal symbol and the initially transmitted reference signal symbol are formed in the frequency domain position. Interleaving to further improve the accuracy of the second device's estimated channel.

Configuration mode 3: When the retransmission is configured, the frequency domain interval of the reference signal increases, and the frequency domain offset occurs.

The first indication information sent by the sending device is used to indicate that the frequency domain interval of the first reference signal is greater than the frequency domain interval of the second reference signal, thereby reducing the overhead of the reference signal during retransmission, and indicating the first reference signal and the second The frequency domain offset occurs when the reference signal is compared, so that the first reference signal and the second reference signal cross each other in the frequency domain, thereby improving the accuracy of the estimated channel of the receiving device.

It should be noted that the first device specifically adopts one of the foregoing three configurations, and may be determined according to the current number of transmissions or the number of the redundancy version, which is not limited by the embodiment of the present application.

The time-frequency resource location of the reference signal can also be determined by a formula. For example, referring to a time-frequency resource configuration method of a reference signal shown in FIG. 3, the frequency domain position of each reference signal is set by a predefined formula.

The data transmission method provided by the present application is characterized in that the time-frequency resource of the reference signal of the retransmitted data is different from the reference signal of the initial transmission data by the transmission device, and the reference signal of the reference signal of the retransmission data is different. The flexibility of the time-frequency resource configuration of the reference signal and the efficiency of data transmission are adapted to new services and application scenarios such as URLLC. In addition, the first indication information indicates that a frequency domain offset occurs between the first reference signal and the second reference signal, so that frequency domain positions of the reference data of the initial transmission data and the retransmission data cross each other, further improving the estimation of the receiving device. The accuracy of the signal.

In another embodiment of the present application, in order to further save the resource overhead of the reference signal, the reference signal is not transmitted during retransmission, and the overhead of the reference signal is zero.

As shown in FIG. 7, the first indication information sent by the first device is further used to indicate that the first reference signal is not sent when the first data is retransmitted. For example, in the second transmission and the third transmission of the first data, the indication information indicates that the reference signal is not configured on all time-frequency resources, and R1 is equal to zero, which is adopted compared to the existing first data transmitted each time. The same reference signal configuration greatly saves the overhead of the reference signal.

Referring to FIG. 8, the present application also provides an embodiment of a method for transmitting first data four times. In order to reduce the resource overhead of the reference signal and ensure the quality of the channel estimation, the first device retransmits the configuration reference signal when retransmitting the first data, and some retransmission does not configure the reference signal.

As shown in FIG. 8, the indication information sent by the first device indicates that the reference signal is not transmitted when the first data is transmitted for the second time and the fourth time, and the reference signal is configured when the first data is transmitted for the first time and the third time. Moreover, in order to improve the accuracy of the channel estimation of the second device, when the first data is transmitted for the third time, the first reference signal is offset from the second reference signal, and the second reference signal is located in one transmission. The first time domain symbol, and the first reference signal is located in the second time domain symbol in one transmission.

In still another embodiment, the first device, when transmitting the first indication information, further receives feedback information from the second device for transmission of the first data, the feedback information including an acknowledgement (ACK) and a negative acknowledgement (negative acknowledgment, NACK). As shown in FIG. 9, the first device generates first indication information based on the ACK/NACK feedback information, and when receiving the NACK information from the second device, generates first indication information, and sends the first indication information to the second device.

In addition, the first device may perform a blind retransmission of the first data, that is, actively retransmit the first data before receiving the ACK/NACK fed back by the second device, and correspondingly, the first device sends the first indication information, A time-frequency resource indicating a first reference signal used by the first device to retransmit the first data.

The embodiment of the present application further provides a method for determining a time-frequency resource of a reference signal in a predefined manner. The first device and the second device pre-define the time-frequency resources of the reference signal used in each data transmission without the first device sending the indication information to the second device, thereby reducing the overhead of the control signaling.

Specifically, the time-frequency resource of the reference signal used in each predefined data transmission may be the same as the time-frequency resource of the reference signal indicated in the foregoing embodiment. For example, the frequency domain interval between two adjacent reference signal symbols of the reference signal used when the first data is initially transmitted is 2, and the adjacent two reference signal symbols of the reference signal used for retransmission of the first data The frequency domain interval is 4. If the time interval between the retransmission of the first data and the initial transmission is greater than a time threshold, for example 1 ms, the frequency domain interval between adjacent two reference signal symbols of the reference signal used in the first data retransmission is re Configured as 2 REs. Meanwhile, the frequency domain offset of the reference signal symbol may also be bound to the number of transmissions of the first data. For example, the frequency domain offset of the reference signal used for the first retransmission of the first data is set to 1 RE, The frequency domain offset of the reference signal used for the second retransmission of a data is set to 3 REs. By setting the frequency domain offset, the frequency domain position of the reference signal used for retransmitting data is crossed with the frequency domain position of the reference signal used by the initial transmission data, thereby improving the accuracy of the channel estimation result.

FIG. 10 shows a time-frequency resource configuration of a reference signal when the first data is transmitted and retransmitted. In the first transmission, the frequency domain interval of the second reference signal is 2 REs, and the frequency domain offset is 0. In the second transmission, the frequency domain interval of the first reference signal is 4 REs, and the frequency domain offset is 1 RE; in the third transmission, the frequency domain interval of the first reference signal is 4 REs, the frequency domain The offset is 3 REs. The time-frequency resource of the reference signal may be notified to the receiving device by the sending device by means of signaling, or the time-frequency resource of the reference signal used for each data transmission may be predefined in advance by the above predefined manner. The signaling notification may be physical layer signaling, media access layer signaling, or radio resource control layer signaling.

The embodiment further provides a data transmission method, which is applied to the second device. Specifically, as shown in FIG. 11, the method includes the following steps:

Step 201: The second device receives the first indication information, where the first indication information is used to indicate a time-frequency resource of the first reference signal, and the first reference signal is used to perform channel estimation on the retransmitted data of the first data. The second device determines, according to the first indication information, a time-frequency resource of the first reference signal of the retransmitted data.

After receiving the first indication information, the second device acquires a time-frequency position of the first reference signal, and estimates channel estimation of the wireless channel experienced by the retransmission data of the first data according to the first reference signal.

Step 202: The second device receives the retransmission data.

The first indication information includes information for indicating a time-frequency position of the first reference signal, where the information of the time-frequency location includes a frequency domain interval, a frequency domain offset, a time domain interval, and a time domain offset. At least one of them. In addition, the first indication information may be further used to indicate that the first device does not send the first reference signal.

Further, the method further includes: receiving second indication information, where the second indication information is used to indicate a time-frequency resource of the second reference signal, and the second reference signal is used for the first transmission of the first data Perform channel estimation.

The time-frequency resource of the first reference signal includes R1 time-frequency resource units, and the time-frequency resource of the second reference signal includes R2 time-frequency resource units, where R1 is less than or equal to R2, and R1 is greater than or equal to zero. An integer, R2 is a positive integer. When R1 is equal to zero, it means that the first reference signal is not sent, the reference signal overhead is the smallest, and the saved time-frequency resources can be used for data transmission, thereby improving data transmission efficiency.

Further, the method provided in this embodiment further includes:

The second device receives the initial data of the first data or retransmits the data, and generates an ACK/NACK verification result; if correctly received, generates an ACK; otherwise, generates a NACK; the second device sends the ACK/NACK Send to the first device.

In addition, the second device may also obtain a frequency domain interval and a frequency domain offset of the reference signal by a blind detection method. The possible frequency domain spacing and frequency domain offset of the reference signal are known, so a combination of frequency domain spacing and frequency domain offset is also known. The second device may perform blind detection on the reference signal according to a combination of possible frequency domain spacing and frequency domain offset.

The second device may also use the combination of the above manners to obtain information of the time-frequency resource of the reference signal used by the current data transmission.

It is to be understood that the data transmission method applied to the second device is corresponding to the data transmission method applied to the first device, and the related implementation method and the step may be obtained by referring to the method embodiment of the first device. This is not mentioned here.

In the above embodiment, when the time interval between the retransmission and the initial transmission of the first data is less than a predefined threshold, for example, 1 ms, the second device may reuse the first data when receiving the retransmission data of the first data. The channel estimation result obtained by using the second reference channel is transmitted, that is, the second device demodulates the retransmission data of the first data by using the channel estimation result when the first data is initially transmitted. Correspondingly, the first device may not send the first reference signal when retransmitting the first data.

If the control information sent by the first device to the second device carries the valid time information of the reference signal, and the first device sends the data within the valid time window, the second device may demodulate the channel estimation result in the buffer. Control the information to know if the transmission has its own data. If the reference signal valid time is exceeded, the second device may discard the channel estimation result in the buffer, and if the subsequent data transmission has no reference signal, the subsequently transmitted data may not be correctly demodulated. The effective time is not limited to a fixed value, and the effective time can also be changed by control signaling.

In this embodiment, by setting the effective time of the reference signal, the second device can determine whether to use the previous channel estimation result according to the valid time information, thereby further improving the accuracy of the channel estimation result.

It should be noted that the method provided by the foregoing embodiment includes, but is not limited to, a URLLC service, and other services may be used if the channel does not change much between multiple transmissions. The definition of multiple transmissions is not limited to initial transmission and retransmission. If a user has multiple consecutive data packets to be sent and the frequency domain resources used are the same, the interval between two initial transmissions is shorter, and the channel changes are not large. Also applies to this program.

It can be understood that the foregoing method embodiments are not limited to reference signal multiplexing between retransmission and initial transmission. More generally, the foregoing method embodiments may be used for the N+M transmission and the Nth of the first data. The reference signal is multiplexed between secondary transmissions, where N and M are both positive integers.

When the N+Mth transmission of the first data overlaps with the frequency domain resource used in the Nth transmission, the N+M transmission is performed for the portion where the N+M transmission overlaps with the Nth transmission frequency domain. The reference signal used can be obtained by referring to the foregoing method embodiment, that is, the reference signal multiplexing between two transmissions is performed with reference to the foregoing method embodiment; for the non-overlapping region, the reference signal used for the N+M transmission can refer to the above The method examples are obtained and can also be determined separately. For the non-overlapping region, if the N+M transmission refers to the reference signal used in the above method embodiment to reuse the Nth transmission, the reception performance of the data may be affected in some scenarios, so the non-overlapping region portion may be separately determined. The reference signal used for N+M transmissions.

FIG. 11A is a schematic diagram of reference signal multiplexing according to an embodiment of the present application. As shown in FIG. 11A, in the frequency domain overlap region, the reference signal used for the N+Mth transmission of the first data is used to multiplex the Nth transmission of the first data by the method shown in FIGS. 5 to 10. Reference signal; in the non-overlapping region, the reference signal used for the N+Mth transmission of the first data is determined separately. The reference signal of the non-overlapping area may be predefined, or may be determined by the first indication information or the second indication information in the foregoing method embodiment.

As shown in FIG. 12, the embodiment further provides a data transmission device, which is used to implement the function of the first device as the sending device in the foregoing method embodiment, and the device includes an obtaining unit 1201 and a sending unit 1202. among them:

The obtaining unit 1201 is configured to obtain first indication information, where the first indication information is used to indicate a time domain resource of the first reference signal, and the first reference signal is used to perform channel estimation on the retransmitted data of the first data.

The sending unit 1202 is configured to send the first indication information, and is further configured to send the retransmission data.

Further, the first indication information includes information indicating a time-frequency position of the first reference signal, where the information of the time-frequency location includes a frequency domain interval, a frequency domain offset, a time domain interval, and a time domain offset. In addition, the first indication information may be further used to indicate that the first device does not send the first reference signal.

Further, the sending unit 1202 is further configured to send second indication information, where the second indication information is used to indicate a time-frequency resource of the second reference signal, where the second reference signal is used for the first time of the first data The transmission performs channel estimation. The time-frequency resource of the first reference signal includes R1 time-frequency resource units, and the time-frequency resource of the second reference signal includes R2 time-frequency resource units, where R1 is less than or equal to R2, and R1 is an integer greater than or equal to zero, and R2 is A positive integer.

Further, the sending unit 1202 is further configured to: pass the first indication information and/or the second indication information to any one of physical layer control signaling, radio resource control layer signaling, and media access control layer signaling. A kind of transmission.

Optionally, the apparatus further includes a receiving unit 1203, configured to receive ACK/NACK information from the second device.

Optionally, the obtaining unit 1201 generates first indication information according to the received NACK information from the second device.

Further, the acquiring unit 1201 is configured to generate first indication information, and is further configured to generate second indication information. Further, the obtaining unit 1201 is further configured to generate first indication information according to the received NACK information from the second device. Optionally, the obtaining unit 1201 is further configured to generate second indication information according to the received ACK information from the second device.

As shown in FIG. 13, the embodiment further provides another data transmission device, which is used to implement the function of the second device as the receiving device in the foregoing method embodiment. The device comprises: a receiving unit 1301 and a processing unit 1302, wherein:

The receiving unit 1301 is configured to receive first indication information, where the first indication information is used to indicate a time-frequency resource of the first reference signal, and the first reference signal is used to perform channel estimation on the retransmitted data of the first data.

The processing unit 1302 is configured to determine a time-frequency resource of the first reference signal according to the first indication information.

The receiving unit 1301 is further configured to receive the retransmitted data.

Optionally, the first indication information includes information indicating a time-frequency position of the first reference signal, where the information of the time-frequency location includes a frequency domain interval, a frequency domain offset, a time domain interval, and a time domain. At least one of the offsets.

After receiving the first indication information, the processing unit 1301 determines the time-frequency position of the first reference signal according to the information of the time-frequency position of the first reference signal.

Further, the processing unit 1302 further estimates channel estimation of the wireless channel experienced by the retransmission data of the first data according to the first reference signal.

Further, the receiving unit 1301 is further configured to receive second indication information, where the second indication information is used to indicate a time-frequency resource of the second reference signal, where the second reference signal is used for the first time of the first data The transmitting performs channel estimation. The processing unit 1302 is further configured to estimate a channel state of the first transmission according to the second indication information.

Further, the receiving unit 1301 is further configured to receive initial data or retransmit data of the first data, and the processing unit 1302 is further configured to verify whether the first data is correctly received, and generate an ACK/NACK verification. As a result, if it is correctly received, an ACK is generated; otherwise, a NACK is generated; and a transmitting unit 1303 is provided for transmitting the verification result.

The data transmission device shown in FIG. 12 and FIG. 13 is functionally divided. In an actual application scenario, the structure of the data transmission device can also be divided from a hardware perspective, wherein the device is switched from a hardware perspective to the cell. The functions of the data transmission apparatus shown in FIG. 12 and FIG. 13 may be the same, for example, all UEs, wherein one UE is the first device and the other UE is the second device; of course, FIG. 12 and The hardware structure of the data transmission apparatus shown in FIG. 13 may also be different. For example, the apparatus shown in FIG. 12 is a UE, and the apparatus shown in FIG. 13 is a base station. It should be noted that in different communication processes, FIG. 12 The roles of the device and the device shown in Figure 13 are also interchangeable. Based on this, the hardware configuration of the data transmission device shown in FIGS. 12 and 13 will be described below with a specific device.

FIG. 14 is a schematic structural diagram of still another data transmission apparatus according to an embodiment of the present invention. The data transmission apparatus shown in FIG. 14 includes a transmitter/receiver 1401, a controller/processor 1402, a memory 1403, and a communication unit 1404. The transmitter/receiver 1401 is used to support radio communication between the device and the peer device and other devices on the network.

When the data transmission apparatus shown in FIG. 14 is used as a hardware implementation structure of the data transmission apparatus shown in FIG. 12, the transmitter/receiver 1401 is used to implement the functions of the transmitting unit 1202 and the receiving unit 1203 in FIG. The processor 1402 is configured to implement the function of the obtaining unit 1201 in FIG. The memory 1403 is configured to store a program. In particular, the program can include program code, the program code including computer operating instructions. The memory 1403 may include a random access memory (RAM), and may also include a non-volatile memory such as at least one disk storage. The controller/processor 1402 implements the functions performed by the first device in the method embodiment by executing a program stored in the memory 1403.

When the data transmission apparatus shown in FIG. 14 is used as a hardware implementation structure of the data transmission apparatus shown in FIG. 13, the transmitter/receiver 1401 is used to implement the functions of the transmitting unit 1303 and the receiving unit 1301 in FIG. 13, The processor 1402 is configured to implement the functions of the processing unit 1302 of FIG. The memory 1403 is configured to store a program. In particular, the program can include program code, the program code including computer operating instructions. The memory 1403 may include a random access memory (RAM), and may also include a non-volatile memory such as at least one disk storage. The controller/processor 1402 implements the functions performed by the second device in the method embodiment by executing a program stored in the memory 1403.

It will be understood that Figure 14 only shows a simplified design of the data transmission device. In practical applications, the data transmission device may include any number of transmitters, receivers, processors, controllers, memories, communication units, etc., and all data transmission devices that can implement the present invention are within the scope of the present invention. .

The controller/processor for performing the functions of the above data transmission apparatus of the present invention may be a central processing unit (CPU), a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), and a field programmable gate array ( FPGA) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.

It can be understood that when the embodiment of the present application is applied to the first device chip, the first device chip implements the functions of the above-mentioned obtaining unit 1201 or the above-described controller/processor 1402. The first device chip may send the first indication information and the second indication information to other modules in the first device, such as a radio frequency module or an antenna. The first indication information and the second indication information are sent to the second device via other modules of the first device. Optionally, the first device chip may further receive the NACK information from other modules in the first device, such as a radio frequency module or an antenna, where the NACK information is sent by the second device to the first device.

When the embodiment of the present application is applied to a second device chip, the second device chip implements the functions of the processing unit 1302 or the controller/processor 1402 described above. The second device chip may receive the first indication information and the second indication information from other modules in the second device, such as a radio frequency module or an antenna, where the first indication information and the second indication information are sent by the first device to the first device. Two devices. Optionally, the second device chip may further send the NACK information to other modules in the second device, such as a radio frequency module or an antenna, and the NACK information is sent to the first device by using other modules of the second device.

The method steps in the embodiments of the present application may be implemented by means of hardware, or may be implemented by a processor executing software instructions. The software instructions can be composed of corresponding software modules, which can be stored in random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory (Programmable ROM). , PROM), Erasable PROM (EPROM), Electrically Erasable Programmable Read Only Memory (EEPROM), Register, Hard Disk, Mobile Hard Disk, CD-ROM, or well known in the art Any other form of storage medium. An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a transmitting device or a receiving device. Of course, the processor and the storage medium can also exist as discrete components in the transmitting device or the receiving device.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present invention are generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions can be stored in or transmitted by a computer readable storage medium. The computer instructions can be from a website site, computer, server or data center to another website site by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.) Transfer from a computer, server, or data center. The computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media. The usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)).

It is to be understood that the various numbers in the embodiments of the present application are not to be construed as limiting the scope of the embodiments.

It should be understood that, in the embodiments of the present application, the size of the sequence numbers of the foregoing processes does not mean the order of execution sequence, and the execution order of each process should be determined by its function and internal logic, and should not be implemented in the application. The implementation of the examples constitutes any limitation.

The above descriptions are only specific embodiments of the embodiments of the present application, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be covered in the implementation of the present application. The scope of protection of the example.

Claims

A data transmission method, characterized in that the method comprises:

The first device sends the first indication information, where the first indication information is used to indicate a time-frequency resource of the first reference signal, and the first reference signal is used to perform channel estimation on the retransmitted data of the first data;

The first device sends the retransmission data.
The method of claim 1, wherein the first indication information comprises information indicating a time-frequency location of the first reference signal.
The method according to claim 2, wherein the information of the time-frequency location comprises at least one of a frequency domain interval, a frequency domain offset, a time domain interval, and a time domain offset.
The method according to claim 1, wherein the first indication information is further used to indicate that the first device does not send the first reference signal.
The method according to any one of claims 1 to 4, further comprising:

And transmitting second indication information, where the second indication information is used to indicate a time-frequency resource of the second reference signal, and the second reference signal is used to perform channel estimation on the first transmission of the first data.
The method of claim 5 wherein:

The time-frequency resource of the first reference signal includes R1 time-frequency resource units, and the time-frequency resource of the second reference signal includes R2 time-frequency resource units, where R1 is less than or equal to R2, and R1 is an integer greater than or equal to zero. R2 is a positive integer.
The method according to any one of claims 1 to 6, wherein the first indication information passes any one of physical layer control signaling, radio resource control layer signaling, and medium access control layer signaling. send.
The method according to claim 5 or 6, wherein the second indication information is sent by any one of physical layer control signaling, radio resource control layer signaling, and medium access control layer signaling.
A data transmission method, characterized in that the method comprises:

The second device receives the first indication information, where the first indication information is used to indicate a time-frequency resource of the first reference signal, and the first reference signal is used to perform channel estimation on the retransmitted data of the first data;

The second device receives the retransmission data.
The method of claim 9, wherein the first indication information comprises information indicating a time-frequency location of the first reference signal.
The method according to claim 10, wherein the information of the time-frequency location comprises at least one of a frequency domain interval, a frequency domain offset, a time domain interval, and a time domain offset.
The method according to claim 9, wherein the first indication information is further used to indicate that the first device does not send the first reference signal.
The method according to any one of claims 9 to 12, wherein the method further comprises:

Receiving second indication information, the second indication information is used to indicate a time-frequency resource of the second reference signal, and the second reference signal is used to perform channel estimation on the first transmission of the first data.
The method according to claim 13, wherein the time-frequency resource of the first reference signal comprises R1 time-frequency resource units, and the time-frequency resource of the second reference signal comprises R2 time-frequency resource units, wherein R1 is less than or equal to R2, R1 is an integer greater than or equal to zero, and R2 is a positive integer.
A data transmission device, characterized in that the device comprises:

An acquiring unit, configured to acquire first indication information, where the first indication information is used to indicate a time-frequency resource of the first reference signal, and the first reference signal is used to perform channel estimation on the retransmitted data of the first data;

a sending unit, configured to send the first indication information;

The sending unit is further configured to send the retransmitted data.
The apparatus according to claim 15, wherein said first indication information comprises information for indicating a time-frequency position of said first reference signal.
The apparatus according to claim 16, wherein the information of the time-frequency location comprises at least one of a frequency domain interval, a frequency domain offset, a time domain interval, and a time domain offset.
The apparatus according to claim 15, wherein the first indication information is further used to indicate that the first device does not send the first reference signal.
Apparatus according to any one of claims 15 to 18, wherein

The sending unit is further configured to send second indication information, where the second indication information is used to indicate a time-frequency resource of the second reference signal, and the second reference signal is used for the first time of the first data The transmission performs channel estimation.
The device according to claim 19, characterized in that

The time-frequency resource of the first reference signal includes R1 time-frequency resource units, and the time-frequency resource of the second reference signal includes R2 time-frequency resource units, where R1 is less than or equal to R2, and R1 is an integer greater than or equal to zero. R2 is a positive integer.
Apparatus according to any one of claims 15 to 20, wherein

The sending unit is further configured to send the first indication information by using any one of physical layer control signaling, radio resource control layer signaling, and media access control layer signaling.
Device according to claim 19 or 20, characterized in that

The sending unit is further configured to send the second indication information by using any one of physical layer control signaling, radio resource control layer signaling, and medium access control layer signaling.
A data transmission device, characterized in that the device comprises:

a receiving unit, configured to receive first indication information, where the first indication information is used to indicate a time-frequency resource of the first reference signal, and the first reference signal is used to perform channel estimation on the retransmitted data of the first data;

a processing unit, configured to determine a time-frequency resource of the first reference signal according to the first indication information;

The receiving unit is further configured to receive the retransmitted data.
The apparatus according to claim 23, wherein said first indication information comprises information for indicating a time-frequency position of said first reference signal.
The apparatus according to claim 24, wherein the information of the time-frequency location comprises at least one of a frequency domain interval, a frequency domain offset, a time domain interval, and a time domain offset.
The apparatus according to claim 23, wherein the first indication information is further used to indicate that the first device does not send the first reference signal.
Apparatus according to any one of claims 23 to 26, wherein

The receiving unit is further configured to receive second indication information, where the second indication information is used to indicate a time-frequency resource of the second reference signal, and the second reference signal is used for the first time of the first data The transmission performs channel estimation.
The device according to claim 27, wherein

The time-frequency resource of the first reference signal includes R1 time-frequency resource units, and the time-frequency resource of the second reference signal includes R2 time-frequency resource units, where R1 is less than or equal to R2, and R1 is an integer greater than or equal to zero. R2 is a positive integer.
A computer readable storage medium for storing a computer program or instructions, wherein when the computer program or instructions are run on a computer, causing the computer to perform the following methods:

And transmitting the first indication information, where the first indication information is used to indicate a time-frequency resource of the first reference signal, where the first reference signal is used to perform channel estimation on the retransmitted data of the first data;

Sending the retransmitted data.
A computer readable storage medium for storing a computer program or instructions, wherein when the computer program or instructions are run on a computer, causing the computer to perform the following methods:

Receiving first indication information, where the first indication information is used to indicate a time-frequency resource of the first reference signal, and the first reference signal is used to perform channel estimation on the retransmitted data of the first data;

Receiving the retransmitted data.
A computer program product characterized by causing a computer to perform the following methods when it is run on a computer:

And transmitting the first indication information, where the first indication information is used to indicate a time-frequency resource of the first reference signal, where the first reference signal is used to perform channel estimation on the retransmitted data of the first data;

Sending the retransmitted data.
A computer program product characterized by causing a computer to perform the following methods when it is run on a computer:

Receiving first indication information, where the first indication information is used to indicate a time-frequency resource of the first reference signal, and the first reference signal is used to perform channel estimation on the retransmitted data of the first data;

Receiving the retransmitted data.