WO2021142626A1

WO2021142626A1 - Uplink feedback method and device

Info

Publication number: WO2021142626A1
Application number: PCT/CN2020/072049
Authority: WO
Inventors: 李胜钰; 官磊
Original assignee: 华为技术有限公司
Priority date: 2020-01-14
Filing date: 2020-01-14
Publication date: 2021-07-22

Abstract

The present application provides an uplink feedback method and device. A network device indicates the position of a reference symbol to a terminal device by means of first indication information. The terminal device demodulates and decodes data (second downlink data) not later than the reference symbol in first downlink data, and according to the position information of the reference symbol, determines a time-frequency resource for feedback. Then, the terminal device feeds back the decoding result of the second downlink data to the network device on the time-frequency resource. By means of the method, the terminal device generates the decoding result in advance on the basis of the received partial data, and feeds it back to the network device in advance, thus shortening the feedback delay, increasing the opportunity for data transmission within the same time, and improving the reliability of data transmission.

Description

Method and device for uplink feedback

Technical field

The embodiments of the present application relate to the field of wireless communication, and in particular, to a method and device for uplink feedback.

Background technique

Compared with the 4th generation (4G) mobile communication system, the fifth generation (5G) mobile communication system has a significant feature that is the increase in ultra-reliable and low-latency communication. communications, URLLC) business support. There are many types of URLLC services. Typical business scenarios include industrial control, unmanned driving, remote surgery, and smart grids. For URLLC services, a typical requirement is that the reliability of sending 32 bytes of data within 1 millisecond (millisecond, ms) must reach 99.999%. It should be pointed out that the above performance indicators are just examples. Different URLLC services may have different requirements for reliability. For example, in some extremely demanding industrial control application scenarios, the transmission success probability of URLLC service data needs to be within 0.25 ms. Reached 99.9999999%. The existing feedback method causes additional processing delay, reduces the transmission opportunity of URLLC service data within the specified delay, and makes the transmission of URLLC service data unable to meet very high reliability and extremely low delay.

Summary of the invention

The present application provides a method and device for uplink feedback, which are used to shorten the feedback delay.

In the first aspect, this application provides an uplink feedback method, and the execution subject of the method is a terminal device or a module in the terminal device. Here, the terminal device is taken as the execution subject as an example for description. The terminal device receives first indication information from the network device, the first indication information indicates the time-frequency resource of the first downlink data channel, and the first downlink data channel carries the first downlink data; the terminal device obtains the position of the reference symbol Information, the terminal device determines the first downlink time-frequency resource according to the position information of the reference symbol, and the first downlink time-frequency resource is part or all of the time-frequency resource of the first downlink data channel; the terminal device Receive second downlink data from the network device on the first downlink time-frequency resource, where the second downlink data is part or all of the first downlink data; the terminal device is based on the first offset value and the reference symbol The location information of determines the first feedback time unit; the terminal device sends feedback information of the second downlink data to the network device on the above-mentioned first feedback time unit.

By implementing the method described in the first aspect, the network device indicates the position of the reference symbol to the terminal device through the first indication information. The terminal device demodulates and decodes data not later than the reference symbol in the first downlink data (ie, the second downlink data). The terminal device determines the time-frequency resource to be fed back according to the position information of the reference symbol and the first offset value, and sends the decoding result of the second downlink data to the network device on the time-frequency resource. Through this method, the terminal device generates the decoding result in advance based on the received part of the data, and feeds it back to the network device in advance, thereby shortening the feedback delay, increasing the opportunity for data transmission in the same time, and improving the reliability of data transmission .

In a possible implementation manner of the first aspect, the foregoing obtaining the location information of the reference symbol specifically includes: the terminal device obtaining the location information of the reference symbol through the foregoing first indication information.

In a possible implementation manner of the first aspect, the first indication information further indicates the foregoing first offset value.

In a possible implementation manner of the first aspect, when the feedback information of the second downlink data is NACK, the terminal device demodulates and decodes the first downlink data.

In a possible implementation of the first aspect, the terminal device determines the second feedback time unit according to the first offset value and the position information of the end symbol of the first downlink data, where the second feedback time unit is The foregoing first feedback time unit is different; the terminal device sends feedback information of the first downlink data to the network device in the second feedback time unit.

In a possible implementation manner of the first aspect, the feedback information of the first downlink data is an acknowledgement ACK.

In a possible implementation of the first aspect, the foregoing first downlink data has a total of N repetitions, and the N repetitions are carried on the first downlink data channel, and N is a positive integer; the foregoing first indication information also indicates The M-th repetition, the M-th repetition is one of the above N repetitions, and M is a positive integer not greater than N.

In a possible implementation manner of the first aspect, the foregoing determining the first downlink time-frequency resource according to the location information of the reference symbol specifically includes: determining the first downlink time-frequency resource according to M and the location information of the reference symbol.

In a possible implementation of the first aspect, the foregoing determining the first feedback time unit according to the first offset value and the position information of the reference symbol specifically includes: according to the first offset value, the position information of the reference symbol, and M determines the above-mentioned first feedback time unit.

In the second aspect, the present application provides an uplink feedback method, and the execution subject of the method is a network device or a module in the network device. Here, the network device is taken as the execution subject as an example for description. The network device sends first indication information to the terminal device, the first indication information indicates the time-frequency resource of the first downlink data channel, and the first downlink data channel carries the first downlink data; the network device is in the first downlink The first downlink data is sent to the terminal device on the time-frequency resource of the data channel; the network device determines the first feedback time unit according to the first offset value and the position of the reference symbol; the network device receives the first feedback time unit on the first feedback time unit 2. Feedback information of downlink data, where the second downlink data is part or all of the above-mentioned first downlink data.

The method described in the second aspect is a network-side method corresponding to the method described in the first aspect, so the beneficial effects that can be achieved in the first aspect can also be achieved.

In a possible implementation manner of the second aspect, the foregoing first indication information further indicates the position of the reference symbol.

In a possible implementation manner of the second aspect, the foregoing first indication information further indicates a first offset value.

In a possible implementation manner of the second aspect, when the feedback information of the second downlink data is NACK, the network device determines the second downlink data according to the first offset value and the position of the end symbol of the first downlink data. Feedback time unit; the network device receives feedback information of the first downlink data on the second feedback time unit, where the second feedback time unit is different from the first feedback time unit.

In a possible implementation manner of the second aspect, the feedback information of the first downlink data is an acknowledgement ACK.

In a possible implementation of the second aspect, the foregoing first downlink data has a total of N repetitions, and the N repetitions are carried on the first downlink data channel, and N is a positive integer; the foregoing first indication information also indicates The M-th repetition, the M-th repetition is one of the above N repetitions, and M is a positive integer not greater than N.

In a possible implementation of the second aspect, the foregoing determining the first feedback time unit according to the first offset value and the position of the reference symbol specifically includes: determining according to the first offset value, the position of the reference symbol, and M The above-mentioned first feedback time unit.

In a third aspect, a communication device is provided, which includes functional modules for implementing the foregoing first aspect or any possible implementation of the first aspect.

In a fourth aspect, a communication device is provided, which includes functional modules for implementing the foregoing second aspect or any possible implementation of the second aspect.

In a fifth aspect, a communication device is provided, including a processor and an interface circuit, the interface circuit is used to receive signals from other communication devices other than the communication device and transmit them to the processor or send signals from the processor For communication devices other than the communication device, the processor is used to implement the foregoing first aspect or the method in any possible implementation manner of the first aspect through a logic circuit or executing code instructions.

In a sixth aspect, a communication device is provided, including a processor and an interface circuit, the interface circuit is used to receive signals from other communication devices other than the communication device and transmit them to the processor or to transfer signals from the processor The processor is sent to another communication device other than the communication device, and the processor is used to implement the foregoing second aspect or the method in any possible implementation manner of the second aspect through a logic circuit or an execution code instruction.

In a seventh aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program or instruction. When the computer program or instruction is executed, the first aspect or any possibility of the first aspect is realized. The method in the implementation.

In an eighth aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program or instruction. When the computer program or instruction is executed, the second aspect or any possibility of the second aspect is realized. The method in the implementation.

In a ninth aspect, a computer program product containing instructions is provided, and when the instructions are executed, the first aspect or the method in any possible implementation manner of the first aspect is implemented.

In a tenth aspect, a computer program product containing instructions is provided, and when the instructions are executed, the second aspect or the method in any possible implementation manner of the second aspect is implemented.

In an eleventh aspect, a computer program is provided. The computer program includes code or instructions, and when the code or instructions are executed, the method in the first aspect or any possible implementation manner of the first aspect is implemented.

In a twelfth aspect, a computer program is provided. The computer program includes code or instructions, and when the code or instructions are executed, the second aspect or the method in any possible implementation manner of the second aspect is implemented.

In a thirteenth aspect, a chip system is provided. The chip system includes a processor and may also include a memory, configured to implement at least one of the methods described in the first to second aspects. The chip system can be composed of chips, or it can include chips and other discrete devices.

In a fourteenth aspect, a communication system is provided, which includes the device (such as a terminal device) described in the third aspect or the fifth aspect and the device (such as a network device) described in the fourth aspect or the sixth aspect.

Description of the drawings

FIG. 1 is a schematic diagram of the architecture of a mobile communication system applied in an embodiment of this application;

2 is a schematic flowchart of an uplink feedback method provided by an embodiment of this application;

FIG. 3 is a schematic diagram of position information of a reference symbol provided by an embodiment of this application;

FIG. 4 is a schematic flowchart of an uplink feedback method provided by an embodiment of this application;

FIG. 5 is a schematic diagram of position information of a reference symbol provided by an embodiment of this application;

FIG. 6 is a schematic flowchart of an uplink feedback method provided by an embodiment of this application;

FIG. 7 is a schematic structural diagram of a possible communication device provided by an embodiment of this application.

FIG. 8 is a schematic structural diagram of a possible communication device provided by an embodiment of the application.

Detailed ways

FIG. 1 is a schematic diagram of the architecture of a mobile communication system applied in an embodiment of the present application. As shown in FIG. 1, the mobile communication system includes a core network device 110, a wireless access network device 120, and at least one terminal device (the terminal device 130 and the terminal device 140 in FIG. 1). The wireless access network device 120 includes a radio frequency unit and a baseband unit. For downlink data transmission, the baseband unit may include a channel coding module, a rate matching module, and a modulation module. The terminal device (such as the terminal device 130 and the terminal device 140 in FIG. 1) includes a baseband unit and a radio frequency unit. For downlink data transmission, the baseband unit may include a demodulation module, a de-rate matching module, and a channel decoding module. The channel encoding module can be implemented by an encoder, which is used to encode an information bit sequence and generate an encoded bit sequence. The encoded bit sequence includes information bits and redundant bits. The rate matching module is used to repeat or puncture the bits in the above-mentioned encoded bit sequence, so that the length of the bit sequence after the rate matching is matched with the transmission resource. The modulation module is used to modulate and map the bit sequence obtained after rate matching into complex-valued modulation symbols, so as to improve transmission efficiency. The functions of the demodulation module, the de-rate matching module and the channel decoding module are the inverse processes of the functions of the modulation module, the rate matching module and the channel coding module, respectively. The terminal device is connected to the wireless access network device in a wireless manner, and the wireless access network device is connected to the core network device in a wireless or wired manner. The core network device and the wireless access network device can be separate and different physical devices, or it can integrate the functions of the core network device and the logical function of the wireless access network device on the same physical device, or it can be a physical device. It integrates the functions of part of the core network equipment and part of the wireless access network equipment. The terminal device can be a fixed location, or it can be movable. Fig. 1 is only a schematic diagram. The communication system may also include other network equipment, such as wireless relay equipment and wireless backhaul equipment, which are not shown in Fig. 1. The embodiments of the present application do not limit the number of core network equipment, radio access network equipment, and terminal equipment included in the mobile communication system.

Radio access network equipment is the access equipment that terminal equipment accesses to the mobile communication system in a wireless manner. It can be a base station (base station), an evolved base station (evolved NodeB, eNodeB), a transmission reception point, TRP), the next generation NodeB (gNB) in the 5G mobile communication system, the base station in the future mobile communication system or the access node in the WiFi system, etc.; it can also be a module or unit that completes part of the base station functions, such as It can be a centralized unit (central unit, CU), or a distributed unit (distributed unit, DU). The embodiment of the present application does not limit the specific technology and specific device form adopted by the radio access network device. In this application, wireless access network equipment is referred to as network equipment. Unless otherwise specified, network equipment refers to wireless access network equipment.

The terminal device may also be called a terminal, user equipment (UE), mobile station, mobile terminal, and so on. Terminal equipment can be mobile phones, tablet computers, computers with wireless transceiver functions, virtual reality terminal equipment, augmented reality terminal equipment, wireless terminals in industrial control, wireless terminals in unmanned driving, wireless terminals in remote surgery, and smart grids Wireless terminals in the Internet, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, and so on. The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal device.

Network equipment and terminal equipment can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed on airborne aircraft, balloons, and satellites. The embodiments of the present application do not limit the application scenarios of network equipment and terminal equipment.

Network equipment and terminal equipment can communicate through licensed spectrum, communicate through unlicensed spectrum, or communicate through licensed spectrum and unlicensed spectrum at the same time. Network equipment and terminal equipment can communicate through a frequency spectrum below 6 GHz (gigahertz, GHz), communicate through a frequency spectrum above 6 GHz, and communicate using a frequency spectrum below 6 GHz and a frequency spectrum above 6 GHz at the same time. The embodiment of the present application does not limit the spectrum resource used between the network device and the terminal device.

Hybrid automatic repeat request (HARQ) technology is a technology widely used in 5G new radio (NR) systems to improve transmission efficiency and reliability. Through the HARQ retransmission mechanism, the sender can continue to send the retransmitted data of the TB after the initial transmission block (transport block, TB) fails, so as to ensure the correct transmission of the TB.

However, the HARQ mechanism relies on the receiving end for feedback and requires additional processing delay. Since the URLLC service requires high delay, there is a situation where it is too late to retransmit when the original transmission fails. In order to ensure the successful transmission of URLLC data within the specified time delay, the reliability of the initial transmission can be improved by increasing the initial transmission resources, but this method will reduce the resource utilization efficiency of the system. Another way is to use a shorter transmission time interval (TTI) for data transmission, so that the sender has time to retransmit after the initial transmission fails. However, since this method uses less time domain resources during data transmission, the transmission reliability may not be guaranteed, and it may even require multiple retransmissions to be correctly received, which cannot meet the delay requirements of the URLLC service.

In response to the above problem, the embodiment of the application provides an uplink feedback method. The terminal device generates the decoding result in advance based on the received partial data and feeds it back to the network device in advance, thereby shortening the feedback delay and increasing the same time. The transmission opportunity improves the reliability of data transmission. The technical solutions of the present application will be described in detail below through some embodiments.

The execution subject of the embodiments of the present application may be a network device and a terminal device, and may also be a module applied to the network device and the terminal device, for example, a chip. The following describes the network device and terminal device as an example of the execution subject.

FIG. 2 is a schematic flowchart of an uplink feedback method provided by an embodiment of the application. The embodiment of the present application relates to a specific process of a terminal device sending feedback information to a network device.

S101. The network device sends first indication information to the terminal device. Correspondingly, the terminal device receives the first indication information from the network device. The first indication information indicates the time-frequency resource of the first downlink data channel, and the first downlink data channel carries first downlink data.

In the embodiment of the present application, the first downlink data is data obtained after the network device performs channel coding on the first information bit sequence.

In the embodiment of the present application, the above-mentioned first downlink data channel is dynamically scheduled by the network equipment, or is semi-statically scheduled by the network equipment. When the first downlink data channel is dynamically scheduled by the network device, the terminal device determines the time-frequency resource of the first downlink data channel according to the first indication information; when the first downlink data channel is semi-statically scheduled by the network device, The terminal device determines the time-frequency resource of the first downlink data channel according to the first indication information and semi-persistent scheduling (SPS) configuration information (for example, the period of the SPS). The first indication information may be downlink control information (DCI).

S102. The terminal device obtains the position information of the reference symbol. The terminal device determines the first downlink time-frequency resource according to the location information of the reference symbol, where the first downlink time-frequency resource is part or all of the time-frequency resource of the first downlink data channel.

S103. The network device sends the first downlink data to the terminal device on the time-frequency resource of the first downlink data channel. Correspondingly, the terminal device receives the first downlink data from the terminal device on the time-frequency resource of the first downlink data channel. It is understandable that the terminal device may receive part or all of the first downlink data on the first downlink time-frequency resource, where the first downlink data received on the first downlink time-frequency resource is Part or all of the data is called the second downlink data.

After receiving the second downlink data, the terminal device demodulates and decodes the second downlink data, and performs a cyclic redundancy check (CRC), thereby generating feedback information of the terminal device on the second downlink data. If the CRC is successful, the feedback information of the second downlink data may include an acknowledgement (acknowledgement, ACK), indicating that the terminal device has correctly recovered the first information bit sequence after demodulating and decoding the second downlink data, that is, the first information bit sequence. The original information bit sequence of the downlink data (or the second downlink data) before channel coding; if the CRC fails, the feedback information of the second downlink data may include a negative acknowledgement (NACK) message, indicating that the terminal device is After the downlink data is demodulated and decoded, the first information bit sequence is not correctly recovered.

S104. The terminal device determines a first feedback time unit according to the first offset value and the position information of the aforementioned reference symbol.

The network device sends first indication information to the terminal device, where the first indication information indicates the first offset value. Correspondingly, the terminal device obtains the first offset value by receiving the first indication information from the network device. Or, the network device configures the first offset value for the terminal device through the RRC message. Correspondingly, the terminal device obtains the first offset value by receiving the RRC message from the network device. The unit of the first offset value may be a symbol, a slot, a sub-slot, a mini-slot, or a sub-frame.

Taking the time unit granularity of the first feedback time unit as an example, assuming that the reference symbol is located at the symbol h ₁ _{in the time slot x 1} and the first offset value is y symbols, then the start symbol of the first feedback time unit is Time slot

The symbol in mod((y+h ₁ ),z). In the embodiments of this application,

Indicates rounding down, z is the number of symbols contained in a time slot, and z is a positive integer, for example, z is equal to 12 or 14. Assuming that the reference symbol is located at the symbol h ₁ _{in the symbol time slot x 1} and the first offset value is y time slots, then the start symbol of the first feedback time unit is located at the symbol h ₁ _{in the time slot x 1} +y. The terminal device may determine the first feedback time unit according to the number of symbols that the first feedback time unit lasts in the time domain and the start symbol of the first feedback time unit. Optionally, the number of symbols that the first feedback time unit lasts in the time domain is preset by a protocol or configured by the network device to the terminal device through high-level signaling.

Taking the time unit granularity of the first feedback time unit as a time slot as an example, assuming that the reference symbol is located in the time slot x ₁ and the first offset value is y time slots, then the first feedback time unit is located in the time slot x ₁ +y; Assuming that the reference symbol is located in the time slot x ₁ and the first offset value is y symbols, then the first feedback time unit is located in the time slot

in,

Indicates rounding up.

In the embodiment of the present application, m in the time slot m is the index number of the time slot or the sequence number of the time slot, and n in the symbol n is the index number of the symbol or the sequence number of the symbol.

S105. The terminal device sends feedback information of the terminal device on the second downlink data to the network device in the above-mentioned first feedback time unit. Correspondingly, the network device receives the feedback information of the terminal device on the second downlink data on the first feedback time unit. In this embodiment of the present application, the second downlink data is part or all of the data in the first downlink data generated after the first information bit sequence is channel-coded. The feedback information of the terminal device on the second downlink data can also be described as: the feedback information of the terminal device on the first information bit sequence.

The terminal device can use acquisition method 1 to acquire the position information of the reference symbol.

Acquisition method 1: The network device sends the second instruction information to the terminal device, and the terminal device obtains it through the second instruction information The position information of the reference symbol. That is, the second indication information indicates the position of the reference symbol.

As shown in FIG. 3, the time-frequency resource of the first downlink data channel is the time-frequency resource in the time unit 1. The time unit 1 includes t symbols in the time domain, and t is a positive integer. The time-frequency resource of the first downlink data channel has a total of k symbols in the time domain, and k is a positive integer not greater than t. The start symbol of the k symbols is located at the s-th symbol in the time unit 1, and s is a positive integer not greater than t. In the embodiment of the present application, the time unit is a time domain scheduling unit in the communication system, and the time unit may be a time slot, a sub-slot, a mini-slot, or a sub-frame. In the embodiment of the present application, the rth symbol may also be referred to as a symbol r-1, where r is a positive integer.

Obtaining method 1.1, the second indication information indicates the value of m. In the acquisition method 1.1, the terminal device acquires the position information of the reference symbol through the second indication information. It can also be understood that the terminal device determines the value of m through the second indication information. Where, m represents that the reference symbol is located in the m-th symbol in the time domain resource of the first downlink data channel, 1≤m≤k, and m is a positive integer.

Specifically, the second indication information includes a first bit field, and the first bit field includes n ₁ bits, and n ₁ is a positive integer. Optional, n ₁ is not less than

Is a positive integer. Exemplarily, when k=6, the first bit field may include 3 bits. The mapping relationship between the values of these 3 bits and m is shown in Table 1.

Table 1

第一比特域的取值The value of the first bit field	m或im or i
000000	11
001001	22
010010	33

011011	44
100100	55
101101	66

Those skilled in the art should understand that Table 1 is only an example of the value of the first bit field and the position information of the reference symbol, and the embodiment of the present application does not limit the specific form of the mapping relationship.

Acquisition mode 1.2, the second indication information indicates the value of i. In the acquisition manner 1.2, the terminal device acquires the position information of the reference symbol through the second indication information, which can also be understood as the terminal device determining the value of i through the second indication information. Among them, i represents the i-th symbol in the time unit l where the reference symbol is located, 1≤i≤k, and i is a positive integer.

Specifically, the second indication information includes a first bit field, and the first bit field includes n ₂ bits, and the n ₂ bits indicate the value of i. Optional, n ₂ is not less than

Is a positive integer. When t=6, the first bit field may include 3 bits. The mapping relationship between the values of these 3 bits and i is shown in Table 1. After obtaining the value of i, the terminal device determines the value of m through the value of i, that is, m=i-s+1.

Acquisition mode 1.3, the second indication information indicates the value of α. In the acquisition manner 1.3, the terminal device acquires the position information of the reference symbol through the second indication information, which can also be understood as: the terminal device determines the value of α through the second indication information. Among them, α represents the scale factor, and 0≤α≤1.

specific,

or,

in,

Indicates rounding down. Optionally, the network device configures the terminal device with a possible value set of α through a radio resource control (radio resource control, RRC) message or medium access control (medium access control, MAC) layer signaling, and the network device uses a second instruction The information instructs the terminal device to select a value in the set. Optionally, the value of α may also be preset by the protocol.

Optionally, in this embodiment of the application, the second indication information is the first indication information, or the second indication information is an RRC message, or the second indication information is DCI other than the first indication information.

The terminal device may obtain the position information of the reference symbol through, but not limited to, the above-mentioned obtaining mode 1. After acquiring the location information of the reference symbol, the terminal device determines the first downlink time-frequency resource according to the location information of the reference symbol. Optionally, the first downlink time-frequency resource is all time-frequency resources in the time-frequency resource of the first downlink data channel that are not later than the aforementioned reference symbol in the time domain; or, the first downlink time-frequency resource is the first downlink time-frequency resource. All of the time-frequency resources of a downlink data channel that are earlier than the aforementioned reference symbols in the time domain.

After determining the first downlink time-frequency resource, the terminal device receives the second downlink data from the network device on the first downlink time-frequency resource, and uses the method in step S103 to generate feedback information of the second downlink data.

After the terminal device generates the feedback information of the second downlink data, the terminal device sends the feedback information of the second downlink data to the network device in the first feedback time unit.

The terminal device may use the method in step S104 to determine the first feedback time unit. Correspondingly, after determining the first offset value and the position of the reference symbol, the network device may use but not limited to the method in step S104 to determine the first feedback time unit, and combine the first offset value and the position of the reference symbol The information is sent to the terminal device. The network device may also first determine the first feedback time unit and the first offset value, and then determine the position information of the reference symbol according to the first offset value and the first feedback time unit, and combine the first offset value and the reference symbol The location information is sent to the terminal device.

Further, the terminal device determines the first uplink time-frequency resource, where the first uplink time-frequency resource is the time-frequency resource in the first feedback time unit, and the terminal device sends the second downlink time-frequency resource to the network device on the first uplink time-frequency resource. Data feedback information. Correspondingly, the network device receives feedback information of the second downlink data on the first uplink time-frequency resource.

Optionally, when the first downlink data channel is dynamically scheduled by the network device, the location of the first uplink time-frequency resource may be indicated by the network device through the first indication information; when the first downlink data channel is allocated by the network device During static scheduling, the network device may indicate the configuration information of the SPS through the RRC message, and the configuration information of the SPS carries the location information of the first uplink time-frequency resource. Optionally, the location information of the first uplink time-frequency resource includes time-domain location information and frequency-domain location information of the first uplink time-frequency resource in the first feedback time unit.

The terminal device determines the first uplink time-frequency resource according to the first feedback time unit and the location information of the first uplink time-frequency resource, and sends feedback information of the second downlink data to the network device on the first uplink time-frequency resource. Optionally, the distance between the start symbol of the first uplink time-frequency resource and the reference symbol is greater than or equal to a first threshold, and the distance between the start symbol of the first uplink time-frequency resource and the end symbol of the first downlink data channel Less than the first threshold. In the embodiment of the present application, the first threshold is the shortest processing time from when the terminal device receives downlink data to send the feedback information of the data. Optionally, the first threshold is related to the subcarrier interval used for transmitting the first downlink data, the subcarrier interval used by the first uplink time-frequency resource, and the processing capability of the terminal device, and the first threshold is predefined by the protocol, Or configured by the network equipment to the terminal equipment through RRC signaling or MAC layer signaling.

When the network device does not receive the feedback information of the second downlink data from the terminal device in the first feedback time unit, or the network device receives the feedback information of the second downlink data in the first feedback time unit and the feedback information is NACK, The network device retransmits the first downlink data. Specifically, the network device may send third indication information to the terminal device, where the third indication information indicates the time-frequency resource that carries the third downlink data. Wherein, the third downlink data is the retransmission data of the above-mentioned first downlink data. The third indication information may be DCI.

After the terminal device sends the feedback information of the second downlink data to the network device on the first uplink time-frequency resource, the terminal device determines whether to demodulate and decode the first downlink data. In an optional manner, the terminal device demodulates and decodes the first downlink data to obtain feedback information of the first downlink data. It is understandable that in this manner, regardless of whether the decoding of the second downlink data is successful, the terminal device demodulates and decodes the first downlink data to obtain feedback information of the first downlink data. In another optional manner, when the terminal device fails to decode the second downlink data, it can also be understood that when the feedback information of the second downlink data is NACK, the terminal device demodulates and decodes the first downlink data. Obtain the feedback information of the first downlink data; when the terminal device successfully decodes the second downlink data, it can also be understood that when the feedback information of the second downlink data is ACK, the terminal device does not demodulate and decode the first downlink data. code. In the embodiment of the present application, the feedback information of the terminal device on the first downlink data may also be described as: the feedback information of the terminal device on the first information bit sequence.

The terminal device can use but not limited to the following 4 ways to send feedback information of the first downlink data to the network device:

Manner 1: The terminal device sends the feedback information of the first downlink data to the network device in the second feedback time unit. It can also be understood that, regardless of whether the feedback information of the second downlink data is NACK or ACK, the terminal device sends the feedback information of the first downlink data to the network device in the second feedback time unit;

Manner 2: When the feedback information of the second downlink data is NACK, the terminal device sends the feedback information of the first downlink data to the network device in the second feedback time unit; when the feedback information of the second downlink data is ACK, the terminal device The device does not send feedback information of the first downlink data;

Manner 3: When the feedback information of the first downlink data and the feedback information of the second downlink data are both NACK, the terminal device does not send the feedback information of the first downlink data; when the feedback information of the second downlink data is NACK, the first When the feedback information of a downlink data is ACK, the terminal device sends the feedback information of the first downlink data to the network device in the second feedback time unit; when the feedback information of the second downlink data is ACK, the terminal device does not send the first downlink data. 1. Feedback information of downlink data;

Manner 4: The terminal device does not send feedback information of the first downlink data.

The following describes a specific method for the terminal device to determine the second feedback time unit.

The terminal device determines the second feedback time unit according to the end symbol of the time-frequency resource of the first downlink data channel and the first offset value.

Time granularity to the second feedback unit time is symbol units, for example, the end symbol of the first time-frequency resources is assumed that downlink data channel time slot is located in the symbol x ₂ h _2, y offset of the first symbol, Then the start symbol of the second feedback time unit is the time slot

Symbols _{mod ((y + h 2)} , z); end symbol assumed that the first time-frequency resources of the downlink data channel symbol located in slot x _₂ h _2, y offset of the first slot , Then the start symbol of the second feedback time unit is located at the symbol h ₂ _{in the time slot x 2} +y. The terminal device may determine the second feedback time unit according to the number of symbols that the second feedback time unit lasts in the time domain and the start symbol of the second feedback time unit. Optionally, the number of symbols that the second feedback time unit lasts in the time domain is preset by a protocol or configured by the network device to the terminal device through high-level signaling.

Taking the time unit granularity of the second feedback time unit as a time slot as an example, assuming that the end symbol of the time-frequency resource of the first downlink data channel is located in time slot x ₂ , and the first offset value is y time slots, then the second The feedback time unit is located in the time slot x ₂ +y; assuming that the end symbol of the time-frequency resource of the first downlink data channel is located in the time slot x ₂ and the first offset value is y symbols, then the second feedback time unit is located in the time slot

Further, the terminal device determines the second uplink time-frequency resource, where the second uplink time-frequency resource is the time-frequency resource in the second feedback time unit.

Specifically, the terminal device may use the foregoing method of acquiring the location information of the first uplink time-frequency resource to determine the location information of the second uplink time-frequency resource. The terminal device determines the second uplink time-frequency resource according to the second feedback time unit and the location information of the second uplink time-frequency resource. The terminal device sends feedback information of the first downlink data to the network device on the second uplink time-frequency resource. Correspondingly, the network device receives feedback information of the first downlink data from the terminal device on the second uplink time-frequency resource.

Optionally, the second feedback time unit and the first feedback time unit are different time units, and the time domain position of the first uplink time-frequency resource within the first feedback time unit and the second uplink time-frequency resource at the second feedback time The time domain position in the unit is the same, and the frequency domain position of the first uplink time-frequency resource in the first feedback time unit is the same as the frequency domain position of the second uplink time-frequency resource in the second feedback time unit. The network device simultaneously indicates the location of the first uplink time-frequency resource and the location of the second uplink time-frequency resource through the first indication information or the SPS configuration information in the RRC message, where the location includes a time domain location and a frequency domain location.

Optionally, the second feedback time unit and the first feedback time unit are different time units, and the time domain position of the first uplink time-frequency resource within the first feedback time unit and the second uplink time-frequency resource at the second feedback time The time domain position in the unit is different, and/or the frequency domain position of the first uplink time-frequency resource in the first feedback time unit is different from the frequency domain position of the second uplink time-frequency resource in the second feedback time unit. Optionally, the indication information used to indicate the position of the second uplink time-frequency resource and the indication information used to indicate the position of the first uplink time-frequency resource may be different indication information, where the position includes a time domain position and a frequency domain Location.

Optionally, the second feedback time unit and the first feedback time unit are the same time unit, and the time domain position of the first uplink time-frequency resource within the first feedback time unit and the second uplink time-frequency resource at the second feedback time The time domain position in the unit is different, and/or the frequency domain position of the first uplink time-frequency resource in the first feedback time unit is different from the frequency domain position of the second uplink time-frequency resource in the second feedback time unit. Optionally, the indication information used to indicate the location information of the second uplink time-frequency resource and the indication information used to indicate the location information of the first uplink time-frequency resource may be different indication information, where the location includes time domain location and Frequency domain position.

Optionally, the distance between the start symbol of the second uplink time-frequency resource and the end symbol of the time-frequency resource of the first downlink data channel is greater than or equal to the sum of the first threshold and the second offset value. Wherein, the second offset value is due to the terminal equipment processing the second downlink data (such as channel decoding the second downlink data, and/or sending feedback information of the second downlink data), so that the overall value of the first downlink data Additional processing delay caused by processing. Specifically, the second offset value may be the time when the terminal device demodulates and decodes the second downlink data, and/or the time when the terminal device generates feedback information of the second downlink data. Optionally, the second offset value is 0 symbol, 1 symbol, or 2 symbols; or, the second offset value is related to the length of the first downlink time-frequency resource in the time domain, for example, the second The offset value is a monotonic non-decreasing function of the length of the first downlink time-frequency resource in the time domain.

When the network device receives the feedback information of the first downlink data in the second feedback time unit and the feedback information is an ACK, the network device does not retransmit the first downlink data. If the network device has started to retransmit the first downlink data before receiving the first downlink data feedback information ACK in the second feedback time unit, the network device stops retransmitting the first downlink data. When the feedback information of the second downlink data is NACK and the feedback information of the first downlink data is ACK, the terminal device does not receive or the terminal device does not expect to receive the retransmission of the first downlink data.

The embodiment described in FIG. 2 provides an uplink feedback method. The network device indicates the position information of the reference symbol of the terminal device through the first indication information. The terminal device receives the second downlink data according to the position information of the reference symbol, and the terminal device demodulates and decodes the second downlink data to generate a decoding result of the first information bit sequence. The terminal device determines the time-frequency resource to be fed back according to the position information of the reference symbol and the first offset value, and feeds back the foregoing decoding result to the network device on the time-frequency resource. Through this method, the terminal device generates the decoding result in advance based on the received part of the data, and feeds it back to the network device in advance, thereby shortening the feedback delay, increasing the opportunity for data transmission in the same time, and improving the reliability of data transmission .

FIG. 4 is a schematic flowchart of another uplink feedback method provided by an embodiment of this application. This embodiment relates to a specific process of a terminal device sending feedback information to a network device.

S201: The network device sends first indication information to the terminal device. Correspondingly, the terminal device receives the first indication information from the network device. The first indication information indicates the time-frequency resource of the first downlink data channel, and the first downlink data channel carries first downlink data.

The first downlink data has N repetitions in total, and the above N repetitions are carried on the first downlink data channel, where N is a positive integer. In the embodiment of the present application, the first downlink data has a total of N repetitions, which can also be understood as: the first downlink data has a total of N transmission opportunities. Specifically, the time-frequency resource of the first downlink data channel includes N time-frequency resources, and each time-frequency resource is used to carry one repetition (transmission opportunity). Optionally, the time-frequency resource corresponding to the N repetitions may be located in Same or different time slots. The first indication information also indicates the M-th repetition, and the M-th repetition is one repetition of the above N repetitions, where M is a positive integer not greater than N.

S202: The terminal device obtains the position information of the reference symbol. The terminal device determines the first downlink time-frequency resource according to the location information of the reference symbol and M, where the first downlink time-frequency resource is part or all of the time-frequency resource of the first downlink data channel.

As shown in Figure 5, the first downlink data includes N repetitions, the M-th repetition includes t _M symbols in the time domain, and the reference symbol is located at the w-th symbol (also called symbol w) among the _{t M symbols.} -1), where t _M is a positive integer, and 1≤w≤t _M.

The network device sends second instruction information to the terminal device, and the terminal device obtains the position information of the reference symbol through the second instruction information. That is, the terminal device determines the value of w through the second indication information. The terminal device can determine the value of w by using but not limited to the method of determining the value of m in the acquisition mode 1 of step S102, so as to acquire the position information of the reference symbol.

The terminal device determines the first downlink time-frequency resource according to the acquired position information of the reference symbol and M. Optionally, the first downlink time-frequency resource is the time-frequency resource corresponding to the first repetition to the M-1th repetition of the first downlink data, and the time-frequency resource corresponding to the M-th repetition is not in the time domain. All time-frequency resources that are later than or earlier than the above-mentioned reference symbols.

In particular, the terminal device may also determine the first downlink time-frequency resource only according to M. Specifically, the first downlink time-frequency resource is a time-frequency resource corresponding to the first repetition to the M-th repetition of the first downlink data. In this manner, the terminal device does not need to obtain the position information of the reference symbol, that is, step S202 can be omitted.

S203. The network device sends the first downlink data to the terminal device on the time-frequency resource of the first downlink data channel. The first downlink data is repeated N times on the time-frequency resource of the first downlink data channel. Correspondingly, the terminal device receives the first downlink data from the terminal device on the time-frequency resource of the first downlink data channel. It is understandable that the terminal device may receive part or all of the first downlink data on the first time-frequency resource, where the part of the first downlink data received on the first downlink time-frequency resource Or all the data is called the second downlink data. Alternatively, the terminal device may receive data corresponding to part or all of the repetitions of the first downlink data on the first time-frequency resource, where the first downlink data received on the first time-frequency resource The data corresponding to part of the repetitions or all of the repetitions of the data is called the second downlink data.

After receiving the second downlink data, the terminal device demodulates and decodes the second downlink data, and performs a cyclic redundancy check, thereby generating feedback information of the terminal device on the second downlink data. For detailed description, refer to step S103 in FIG. 2.

S204. The terminal device determines a first feedback time unit according to the first offset value, the position information of the aforementioned reference symbol, and M.

Specifically, the terminal device determines the time unit where the reference symbol is located according to the location information of the reference symbol and M. Specifically, the terminal device determines the time unit where the reference symbol is located according to the value of w and M. For example, the first downlink data includes 3 repetitions, and the time length of each repetition in the time domain is one time slot, and each time slot has 14 symbols, that is, t _M =14. Exemplarily, the first repetition is located in time slot 1, the second repetition is located in time slot 2, the third repetition is located in time slot 3, and the reference symbol is located in the wth symbol in the Mth repetition. When M=1, w=10, the reference symbol is located in time slot 1, or it can also be described as: the reference symbol is located in symbol 9 in time slot 1; when M=3, w=2, the reference symbol is located in time slot 3. Alternatively, it can also be described as: the reference symbol is located at symbol 1 in time slot 3.

The terminal device determines the first feedback time unit according to the time unit where the reference symbol is located and the first offset value. For the manner of obtaining the first offset value by the terminal device and the manner of determining the first feedback time unit, refer to step S104 in FIG. 2. Correspondingly, after determining the first offset value, the position of the reference symbol, and M, the network device may use but not limited to the method in step S204 to determine the first feedback time unit, and combine the first offset value, reference symbol The location information and M are sent to the terminal device. The network device may also first determine the first feedback time unit and the first offset value, and then determine the position and M of the reference symbol according to the first feedback time unit and the first offset value, and combine the first offset value and the reference symbol The location information and M are sent to the terminal device.

S205: The terminal device sends feedback information of the terminal device on the second downlink data to the network device in the above-mentioned first feedback time unit. Correspondingly, the network device receives the feedback information of the terminal device on the second downlink data on the first feedback time unit.

For a detailed description of the steps for the terminal device to determine the first uplink time-frequency resource, refer to the embodiment shown in FIG. 2.

When the network device does not receive the feedback information of the second downlink data from the terminal device in the first feedback time unit, or the network device receives the feedback information of the second downlink data in the first feedback time unit and the feedback information is NACK, The network device retransmits the first downlink data. For detailed description, please refer to the related description in the embodiment shown in FIG. 2.

After the terminal device sends the feedback information of the second downlink data to the network device on the first uplink time-frequency resource, the terminal device determines whether to demodulate and decode the first downlink data. For detailed description, please refer to the related description in the embodiment shown in FIG. 2.

Optionally, there are four ways for the terminal device to send the feedback information of the first downlink data to the network device. For detailed description, please refer to the related description in the embodiment shown in FIG. 2.

The terminal device determines the second feedback time unit according to the end symbol of the last repetition of the first downlink data and the first offset value.

Taking the time unit granularity of the second feedback time unit as symbol as an example, assuming that the last repeated end symbol of the first downlink data is located at the symbol h ₃ _{in the time slot x 3} and the first offset value is y symbols, then The start symbol of the second feedback time unit is a time slot

_{Symbols: mod ((y + h 3} ), z); a first downlink data is assumed that the last end symbol repetition symbols located in the slot x ₃ h _3, y offset of the first slot , Then the start symbol of the second feedback time unit is located at the symbol h ₃ _{in the time slot x 3} +y. The terminal device may determine the second feedback time unit according to the number of symbols that the second feedback time unit lasts in the time domain and the start symbol of the second feedback time unit. Optionally, the number of symbols that the second feedback time unit lasts in the time domain is preset by a protocol or configured by the network device to the terminal device through high-level signaling.

Taking the time unit granularity of the second feedback time unit as a time slot as an example, assuming that the end symbol of the last repetition of the first downlink data is located in time slot x ₃ , and the first offset value is y time slots, then the second feedback The time unit is located in the time slot x ₃ +y; assuming that the end symbol of the last repetition of the first downlink data is located in the time slot x ₃ and the first offset value is y symbols, then the second feedback time unit is located in the time slot

After determining the second feedback time unit, the terminal device determines the second uplink time-frequency resource according to the location information of the second uplink time-frequency resource. Specifically, for the manner in which the terminal device determines the location information of the second uplink time-frequency resource, refer to the related description in the embodiment shown in FIG. 2.

When the network device receives the feedback information of the first downlink data in the second feedback time unit and the feedback information is ACK, the network device does not retransmit the first downlink data; or, if the network device receives the feedback information in the second feedback time unit Before the first downlink data feedback information ACK has started to retransmit the first downlink data, the network device stops retransmitting the first downlink data. When the feedback information of the second downlink data is NACK and the feedback information of the first downlink data is ACK, the terminal device does not receive or the terminal device does not expect to receive the retransmission of the first downlink data.

The embodiment described in FIG. 4 provides an uplink feedback method. The network device indicates the position information of the terminal device reference symbol and M through the first indication information. The terminal device determines the second downlink data according to the position information of the reference symbol and M, and the terminal device demodulates and decodes the second downlink data to generate a decoding result of the first information bit sequence. The terminal device determines the time-frequency resource to be fed back according to the position information of the reference symbol, the first offset value, and M, and feeds back the decoding result to the network device. Through this method, the terminal device generates the decoding result in advance based on the received part of the data, and feeds it back to the network device in advance, thereby shortening the feedback delay, increasing the opportunity for data transmission in the same time, and improving the reliability of data transmission .

FIG. 6 is a schematic flowchart of another uplink feedback method provided by an embodiment of this application. This embodiment relates to a specific process of a terminal device sending feedback information to a network device.

S301. The network device sends first indication information to the terminal device. Correspondingly, the terminal device receives the first indication information from the network device. The first indication information indicates the time-frequency resource of the first downlink data channel, and the first downlink data channel carries first downlink data. For details, refer to step S101 in FIG. 2.

S302. The terminal device determines the first feedback time unit. Specifically, the terminal device determines the first feedback time unit according to the first offset value and the end symbol of the time-frequency resource of the first downlink data channel. The specific manner is the same as the manner of determining the second feedback time unit in the embodiment shown in FIG. 2. The terminal device determines the first uplink time-frequency resource according to the first feedback time unit and the location information of the first uplink time-frequency resource. Specifically, for the manner in which the terminal device determines the location information of the first uplink time-frequency resource, refer to the embodiment shown in FIG. 2.

Optionally, the distance between the start symbol of the first uplink time-frequency resource and the end symbol of the time-frequency resource of the first downlink data channel is less than a first threshold, where the explanation of the first threshold refers to the implementation shown in FIG. 2 example.

S303: When the distance between the start symbol of the first uplink time-frequency resource and the end symbol of the time-frequency resource of the first downlink data channel is less than a first threshold, the terminal device obtains the position information of the reference symbol.

Specifically, the terminal device determines the position information of the reference symbol according to the first uplink time-frequency resource and the first threshold. The reference symbol is earlier than the start symbol of the first uplink time-frequency resource, and the distance between the reference symbol and the start symbol of the first uplink resource is equal to the first threshold.

The terminal device determines the first downlink time-frequency resource according to the location information of the reference symbol, where the first downlink time-frequency resource is part or all of the time-frequency resource of the first downlink data channel. The first downlink time-frequency resource is no later than the reference symbol time-frequency resource among the time-frequency resources of the first downlink data channel; or, the first downlink time-frequency resource is the time-frequency resource of the first downlink data channel All time-frequency resources in the resources that are earlier than the above-mentioned reference symbols in the time domain.

S304. The network device sends the first downlink data to the terminal device on the time-frequency resource of the first downlink data channel. Correspondingly, the terminal device receives the first downlink data from the terminal device on the time-frequency resource of the first downlink data channel. It can be understood that the terminal device may receive the second downlink data on the above-mentioned first downlink time-frequency resource. For details, refer to step S103 in FIG. 2.

S305: The terminal device sends feedback information of the terminal device on the second downlink data to the network device in the first feedback time unit. Correspondingly, the network device receives the feedback information of the second downlink data from the terminal device on the first feedback time unit.

After the terminal device sends the feedback information of the second downlink data to the network device on the first uplink time-frequency resource, the terminal device determines whether to demodulate and decode the first downlink data. For a detailed description, please refer to the embodiment shown in FIG. 2 .

Optionally, there are four ways for the terminal device to send feedback information of the first downlink data to the network device on the second uplink time-frequency resource. For detailed description, please refer to the related description in the embodiment shown in FIG. 2.

The following describes how the terminal device determines the second uplink time-frequency resource. The terminal device determines the second uplink time-frequency resource according to the end symbol of the time-frequency resource of the first downlink data channel, the first threshold, and the second offset value.

Alternatively, the end symbol of the first time-frequency resources is assumed that downlink data channel time slot is located h _₄ x ₄ symbols and the second symbol offset is f, a first threshold of q symbols, the second uplink The distance between the start symbol of the time-frequency resource and the end symbol of the time-frequency resource of the first downlink data channel is f+q symbols, that is, the start symbol of the second uplink time-frequency resource is located in the time slot

The symbol in mod((f+q+h ₄ ),z). The terminal device may determine the time-domain position of the second uplink time-frequency resource according to the number of continuous symbols of the second uplink time-frequency resource in the time domain and the start symbol of the second uplink time-frequency resource. Optionally, the number of continuous symbols of the second uplink time-frequency resource in the time domain is preset by a protocol or configured by the network device to the terminal device through high-level signaling.

When the network device receives the feedback information of the first downlink data on the second uplink time-frequency resource and the feedback information is ACK, the network device does not retransmit the first downlink data; or, if the network device is in the second uplink Before the first downlink data feedback information ACK is received on the frequency resource, the first downlink data has been retransmitted, and the network device stops retransmitting the first downlink data. When the feedback information of the second downlink data is NACK and the feedback information of the first downlink data is ACK, the terminal device does not receive or the terminal device does not expect to receive the retransmission of the first downlink data.

In particular, the terminal device may directly decode the first downlink data after receiving the first downlink data, and send feedback information of the first downlink data to the network device in the first feedback time unit. Specifically, how the terminal device quickly decodes the first downlink data and sends the feedback information of the first downlink data is not limited in the embodiment of the present application.

The foregoing embodiment provides an uplink feedback method. When the distance between the start symbol of the first uplink time-frequency resource and the end symbol of the time-frequency resource of the first downlink data channel is less than the first threshold, the terminal device obtains the position information of the reference symbol through the first indication information. The terminal device determines the second downlink data according to the position information of the reference symbol, and the terminal device demodulates and decodes the second downlink data to generate a decoding result of the first information bit sequence. The terminal device determines the time-frequency resource to be fed back according to the position information of the reference symbol and the first offset value, and feeds back the foregoing decoding result to the network device on the time-frequency resource. With the method provided in the above embodiment, when the uplink time-frequency resource for feeding back the first downlink data arrives in advance, the terminal device generates the decoding result in advance based on the received partial data and feeds it back to the network device in advance, without the need Waiting for the next time-frequency resource used for feedback, thereby shortening the feedback delay.

FIG. 7 and FIG. 8 are schematic structural diagrams of possible communication devices provided by embodiments of this application. These communication devices can be used to implement the functions of the terminal device or the network device in the foregoing method embodiment, and therefore can also achieve the beneficial effects of the foregoing method embodiment. In the embodiment of the present application, the communication device may be the terminal device 130 or the terminal device 140 as shown in FIG. 1, or the wireless access network device 120 as shown in FIG. 1, or it may be applied to the terminal device. Or a module of a network device (such as a chip).

As shown in FIG. 7, the communication device 700 includes a processing unit 710 and a transceiving unit 720. The communication device 700 is used to implement the functions of the terminal device or the network device in the method embodiments shown in FIG. 2, FIG. 4, and FIG. 6 above.

When the communication apparatus 700 is used to implement the function of the terminal device in the method embodiment shown in FIG. 2, the transceiving unit 720 is used to receive the first indication information from the network device, and the first indication information indicates the status of the first downlink data channel. The first downlink data channel carries the first downlink data; the processing unit 710 is configured to obtain the position information of the reference symbol, and determine the first downlink time-frequency resource according to the position information of the reference symbol. The line time-frequency resource is part or all of the time-frequency resource of the first downlink data channel; the transceiver unit 720 is further configured to receive second downlink data from the network device on the first downlink time-frequency resource, The second downlink data is part or all of the above-mentioned first downlink data; the processing unit 710 is further configured to determine the first feedback time unit according to the first offset value and the position information of the above-mentioned reference symbol; the transceiver unit 720 is also configured to Sending feedback information of the second downlink data to the network device in the above-mentioned first feedback time unit.

When the communication device 700 is used to implement the function of the network device in the method embodiment shown in FIG. 2, the transceiver unit 720 is used to send first indication information to the terminal device, where the first indication information indicates the time of the first downlink data channel. The first downlink data channel carries the first downlink data; the transceiver unit 720 is further configured to send the first downlink data to the terminal device on the time-frequency resource of the first downlink data channel; the processing unit 710 It is used to determine the first feedback time unit according to the first offset value and the position of the reference symbol; the transceiver unit 720 is also used to receive feedback information of the second downlink data on the first feedback time unit, and the second downlink data is the above Part or all of the first downlink data.

When the communication apparatus 700 is used to implement the function of the terminal device in the method embodiment shown in FIG. 4, the transceiving unit 720 is used to receive first indication information from the network device, and the first indication information indicates the status of the first downlink data channel. Time-frequency resources. The first downlink data channel carries the first downlink data. The first downlink data has a total of N repetitions. The N repetitions are carried on the first downlink data channel. N is a positive integer. The first indication information also indicates the M-th repetition, the M-th repetition is one of the above-mentioned N repetitions, and M is a positive integer not greater than N; the processing unit 710 is used to obtain the position information of the reference symbol, and according to the reference The position information of the symbol and M determine the first downlink time-frequency resource, and the first downlink time-frequency resource is part or all of the time-frequency resource of the first downlink data channel; the transceiver unit 720 is also configured to The second downlink data from the network device is received on the first downlink time-frequency resource, where the second downlink data is part or all of the first downlink data; the processing unit 710 is further configured to, according to the first offset value, The position information of the reference symbol and M determine the first feedback time unit; the transceiver unit 720 is further configured to send feedback information of the second downlink data to the network device on the first feedback time unit.

When the communication device 700 is used to implement the function of the network device in the method embodiment shown in FIG. 4, the transceiver unit 720 is used to send first indication information to the terminal device, where the first indication information indicates the time of the first downlink data channel. Frequency resources, the first downlink data channel carries the first downlink data, the first downlink data has a total of N repetitions, the N repetitions are carried on the first downlink data channel, N is a positive integer, and the first downlink data An indication information also indicates the M-th repetition. The M-th repetition is one of the above-mentioned N repetitions, and M is a positive integer not greater than N; the transceiver unit 720 is also used for the time of the above-mentioned first downlink data channel. The above-mentioned first downlink data is sent to the terminal device on the frequency resource; the processing unit 710 is configured to determine the first feedback time unit according to the first offset value, the position of the reference symbol, and M; the transceiver unit 720 is also configured to perform the first feedback The feedback information of the second downlink data is received in the time unit, and the second downlink data is part or all of the above-mentioned first downlink data.

When the communication device 700 is used to implement the function of the terminal device in the method embodiment shown in FIG. 6, the transceiving unit 720 is used to receive first indication information from the network device, the first indication information indicating the status of the first downlink data channel Time-frequency resource, the first downlink data channel carries first downlink data; the processing unit 710 is configured to determine the first feedback according to the first offset value and the position information of the end symbol of the time-frequency resource of the first downlink data channel Time unit; the processing unit 710 is also used to obtain the position information of the reference symbol when the distance between the start symbol of the first uplink time-frequency resource and the end symbol of the first downlink data channel time-frequency resource is less than the first threshold, according to The location information of the reference symbol determines the first downlink time-frequency resource, and the first downlink time-frequency resource is part or all of the time-frequency resource of the first downlink data channel; the transceiver unit 720 is also configured to The second downlink data from the network device is received on the first downlink time-frequency resource, where the second downlink data is part or all of the first downlink data; the transceiver unit 720 is also configured to perform the first feedback time unit The upper sends feedback information of the second downlink data to the network device.

When the communication apparatus 700 is used to implement the function of the network device in the method embodiment shown in FIG. 6, the transceiver unit 720 is used to send first indication information to the terminal device, where the first indication information indicates the time of the first downlink data channel. The first downlink data channel carries the first downlink data; the transceiver unit 720 is further configured to send the first downlink data to the terminal device on the time-frequency resource of the first downlink data channel; the processing unit 710 Used to determine the first feedback time unit according to the first offset value and the position of the end symbol of the time-frequency resource of the first downlink data channel; the transceiver unit 720 is also used to receive the second downlink data on the first feedback time unit The second downlink data is part or all of the above-mentioned first downlink data.

More detailed descriptions of the processing unit 710 and the transceiver unit 720 can be obtained directly with reference to the relevant descriptions in the method embodiments shown in FIG. 2, FIG. 4, and FIG. 6, and will not be repeated here.

As shown in FIG. 8, the communication device 800 includes a processor 810 and an interface circuit 820. The processor 810 and the interface circuit 820 are coupled to each other. It can be understood that the interface circuit 820 may be a transceiver or an input/output interface. Optionally, the communication device 800 may further include a memory 830 for storing instructions executed by the processor 810 or storing input data required by the processor 810 to run the instructions or storing data generated after the processor 810 runs the instructions.

When the communication device 800 is used to implement the method shown in FIG. 2, FIG. 4, or FIG. 6, the processor 810 is used to implement the function of the above-mentioned processing unit 710, and the interface circuit 820 is used to implement the function of the above-mentioned transceiving unit 720.

When the foregoing communication device is a chip applied to a terminal device, the terminal device chip implements the function of the terminal device in the foregoing method embodiment. The terminal device chip receives information from other modules in the terminal device (such as a radio frequency module or antenna), and the information is sent by the network device to the terminal device; or, the terminal device chip sends information to other modules in the terminal device (such as a radio frequency module or antenna). The antenna) sends information, which is sent by the terminal device to the network device.

When the aforementioned communication device is a chip applied to a network device, the network device chip implements the function of the network device in the foregoing method embodiment. The network device chip receives information from other modules in the network device (such as radio frequency modules or antennas), 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 radio frequency modules or antennas). The antenna) sends information, which is sent by the network device to the terminal device.

It is understandable that the processor in the embodiments of the present application may be a central processing unit (Central Processing Unit, CPU), or other general-purpose processors, digital signal processors (Digital Signal Processors, DSPs), and 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. The general-purpose processor may be a microprocessor or any conventional processor.

The method steps in the embodiments of the present application can be implemented by hardware, and can also be implemented by a processor executing software instructions. Software instructions can be composed of corresponding software modules, which can be stored in random access memory (Random Access Memory, RAM), flash memory, read-only memory (Read-Only Memory, ROM), and programmable read-only memory (Programmable ROM) , PROM), Erasable Programmable Read-Only Memory (Erasable PROM, EPROM), Electrically Erasable Programmable Read-Only Memory (Electrically EPROM, 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, so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium may also be an integral part of the processor. The processor and the storage medium may be located in the ASIC. In addition, the ASIC can be located in a network device or a terminal device. Of course, the processor and the storage medium may also exist as discrete components in the network device or the terminal 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 by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer programs or instructions. When the computer program or instruction is loaded and executed on the computer, the process or function described in the embodiment of the present application is executed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer program or instruction may be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. 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 integrating one or more available media. The usable medium may be a magnetic medium, such as a floppy disk, a hard disk, and a magnetic tape; it may also be an optical medium, such as a DVD; it may also be a semiconductor medium, such as a solid state disk (SSD).

In the various embodiments of this application, if there are no special instructions and logical conflicts, the terms and/or descriptions between different embodiments are consistent and can be mutually cited. The technical features in different embodiments are based on their inherent Logical relationships can be combined to form new embodiments.

In this application, "at least one" refers to one or more, and "multiple" refers to two or more. "And/or" describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, and B exists alone, where A, B can be singular or plural. In the text description of this application, the character "/" generally indicates that the associated object before and after is an "or" relationship; in the formula of this application, the character "/" indicates that the associated object before and after is a kind of "division" Relationship.

It can be understood that the various numerical numbers involved in the embodiments of the present application are only for easy distinction for description, and are not used to limit the scope of the embodiments of the present application. The size of the sequence number of the above processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic.

Claims

An uplink feedback method, characterized in that the method includes:

Receiving first indication information from a network device, where the first indication information indicates a time-frequency resource of a first downlink data channel, and the first downlink data channel carries first downlink data;

Obtain the location information of the reference symbol, and determine the first downlink time-frequency resource according to the location information of the reference symbol, where the first downlink time-frequency resource is part or all of the time-frequency resource of the first downlink data channel Time-frequency resources;

Receiving second downlink data from the network device on the first downlink time-frequency resource, where the second downlink data is part or all of the first downlink data;

Determine the first feedback time unit according to the first offset value and the position information of the reference symbol;

Sending feedback information of the second downlink data to the network device on the first feedback time unit.
The method according to claim 1, wherein said obtaining the position information of the reference symbol specifically comprises:

Obtain the position information of the reference symbol through the first indication information.
The method according to claim 1 or 2, characterized in that:

The first indication information also indicates the first offset value.
The method according to any one of claims 1 to 3, wherein when the feedback information of the second downlink data is NACK, the method further comprises:

Demodulate and decode the first downlink data.
The method according to claim 4, wherein the method comprises:

Determining a second feedback time unit according to the first offset value and the position information of the end symbol of the first downlink data, where the second feedback time unit is different from the first feedback time unit;

Sending the feedback information of the first downlink data to the network device in the second feedback time unit.
The method of claim 5, wherein:

The feedback information of the first downlink data is an ACK.
The method according to any one of claims 1 to 6, characterized in that,

The first downlink data has a total of N repetitions, the N repetitions are carried on the first downlink data channel, and N is a positive integer;

The first indication information also indicates the M-th repetition, the M-th repetition is one repetition in the N repetitions, and M is a positive integer not greater than N.
The method according to claim 7, wherein the determining the first downlink time-frequency resource according to the position information of the reference symbol specifically comprises:

The first downlink time-frequency resource is determined according to M and the location information of the reference symbol.
The method according to claim 7 or 8, wherein the determining the first feedback time unit according to the first offset value and the position information of the reference symbol specifically includes:

The first feedback time unit is determined according to the first offset value, the position information of the reference symbol, and M.
An uplink feedback method, characterized in that the method includes:

Sending first indication information to a terminal device, where the first indication information indicates a time-frequency resource of a first downlink data channel, and the first downlink data channel carries first downlink data;

Sending the first downlink data to a terminal device on the time-frequency resource of the first downlink data channel;

Determine the first feedback time unit according to the first offset value and the position of the reference symbol;

Receive feedback information of second downlink data on the first feedback time unit, where the second downlink data is part or all of the first downlink data.
The method of claim 10, wherein:

The first indication information also indicates the position of the reference symbol.
The method according to claim 10 or 11, wherein:

The first indication information also indicates a first offset value.
The method according to any one of claims 10 to 12, wherein when the feedback information of the second downlink data is NACK, the method comprises:

Determine a second feedback time unit according to the first offset value and the position of the end symbol of the first downlink data;

The feedback information of the first downlink data is received on a second feedback time unit, where the second feedback time unit is different from the first feedback time unit.
The method according to any one of claims 10 to 12, characterized in that,

The feedback information of the first downlink data is an ACK.
The method according to any one of claims 10 to 14, characterized in that,

The first downlink data has a total of N repetitions, the N repetitions are carried on the first downlink data channel, and N is a positive integer;

The first indication information also indicates the M-th repetition, the M-th repetition is one repetition in the N repetitions, and M is a positive integer not greater than N.
The method according to claim 15, wherein the determining the first feedback time unit according to the first offset value and the position of the reference symbol specifically comprises:

The first feedback time unit is determined according to the first offset value, the position of the reference symbol, and M.
A communication device comprising a module for executing the method according to any one of claims 1-9.
A communication device comprising a module for executing the method according to any one of claims 10 to 16.
A communication device, characterized by comprising a processor and an interface circuit, the interface circuit is used to receive signals from other communication devices other than the communication device and transmit them to the processor or transfer signals from the processor The signal of is sent to another communication device other than the communication device, and the processor is used to implement the method according to any one of claims 1 to 9 through a logic circuit or an execution code instruction.
A communication device, characterized by comprising a processor and an interface circuit, the interface circuit is used to receive signals from other communication devices other than the communication device and transmit them to the processor or transfer signals from the processor The signal of is sent to another communication device other than the communication device, and the processor is used to implement the method according to any one of claims 10 to 16 through a logic circuit or an execution code instruction.
A computer-readable storage medium, characterized in that a computer program or instruction is stored in the storage medium, and when the computer program or instruction is executed by a communication device, it can implement any of claims 1 to 9 or 10 to 16. The method described in one item.
A computer program product, characterized in that the computer program product includes instructions, and when the instructions are executed, the method according to any one of claims 1 to 9 or 10 to 16 is realized.
A communication system, comprising the communication device according to claim 17 or 19, and the communication device according to claim 18 or 20.