CN110611554B

CN110611554B - Transmission method and device of feedback information

Info

Publication number: CN110611554B
Application number: CN201810611517.2A
Authority: CN
Inventors: 杜白; 焦淑蓉; 张鹏
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-06-14
Filing date: 2018-06-14
Publication date: 2021-02-23
Anticipated expiration: 2038-06-14
Also published as: WO2019238014A1; CN110611554A

Abstract

The application provides a transmission method and a device of feedback information, wherein the method comprises the following steps: the terminal device and the base station may determine, by combining the transmission resource of the transport block and/or the number of code blocks included in the transport block, a time at which the feedback information is transmitted in advance, that is, determine a first time unit from N time units corresponding to the transport block; transmitting feedback information of the transport block over the first time unit; in addition, the terminal equipment and the base station can also determine whether the feedback information needs to be transmitted in advance, and the method can reduce the retransmission time delay and improve the reliability of data transmission.

Description

Transmission method and device of feedback information

Technical Field

The present application relates to the field of communications, and in particular, to a method and an apparatus for transmitting feedback information in the field of communications.

Background

The fifth generation (5G) mobile communication system supports enhanced mobile broadband (eMBB) traffic, high-reliability low-latency communications (URLLC) traffic, and massive machine type communications (mtc) traffic.

For example, a typical eMBB service may be: the services include ultra high definition video, Augmented Reality (AR), Virtual Reality (VR), and the like, and these services are mainly characterized by large transmission data volume and high transmission rate. As another example, a typical URLLC service may be: the main characteristics of the services are ultra-high reliability, low time delay, less transmission data volume and burstiness. As another example, a typical mtc service may be: the intelligent power distribution automation system has the main characteristics of huge quantity of networking equipment, small transmission data volume and insensitivity of data to transmission delay, and the mMTC terminals need to meet the requirements of low cost and very long standby time.

The URLLC service has a very high requirement on delay, and the transmission delay requirement is within 0.5 milliseconds (ms) without considering reliability; on the premise of reaching 99.999 percent of reliability, the transmission delay is required to be within 1 ms. In order to meet the requirement of the URLLC scenario on data transmission, reduce the time delay of the data transmission process, and improve the data transmission performance in the 5G mobile communication system, a problem to be solved is urgently needed in the industry.

Disclosure of Invention

The application provides a transmission method and device of feedback information, which can reduce retransmission time delay and improve reliability of data transmission.

In a first aspect, a method for transmitting feedback information is provided, including: determining a first time unit from N time units corresponding to a transmission block, wherein the first time unit is one of the N time units, and N is a positive integer; and sending the feedback information of the transmission block on the first time unit.

In the transmission method for feedback information provided in the embodiment of the present application, the data receiving device sends the feedback information in the first time unit by determining the time when the data receiving device sends the feedback information in advance, that is, determining the first time unit, and the data sending device receives the feedback information, for example, NACK, in the first time unit. Therefore, the data transmitting equipment can retransmit the data in advance, and the retransmission time delay of the data is further reduced. For the service data which is required to be transmitted correctly in a certain time, the retransmission time delay of the data is reduced, which means that the retransmission times can be increased under the requirement of a certain time delay, and the reliability of data transmission is further improved.

With reference to the first aspect, in certain implementations of the first aspect, the first time unit is an nth time unit of the N time units, N is a positive integer less than or equal to N, N is a value according to the N and a first scaling coefficient K₁And (4) determining.

With reference to the first aspect and the foregoing implementation manners, in some possible implementation manners, the n is determined according to any one of the following formulas:

n＝ceil(N×K₁) Wherein ceil represents rounding up; alternatively, the first and second electrodes may be,

n＝floor(N×K₁) Where floor denotes rounding down.

Specifically, in the process that the terminal device determines the first time unit according to the value of the time unit number N included in the transmission block, the first time unit may be determined according to the above formula. Assuming that the first time unit is the nth time unit among the N time units, the nth time unit is determined as the first time unit by calculating the value of N.

With reference to the first aspect and the foregoing implementation manners, in some possible implementation manners, the first time unit is an nth time unit of the N time units, and N is a preset positive integer smaller than or equal to N.

With reference to the first aspect and the foregoing implementation manners, in some possible implementation manners, the transport block includes M code blocks, the first time unit is a last time unit corresponding to an mth code block of the M code blocks, where a value of M is determined according to a value of M and a second scaling coefficient K₂And (4) determining.

With reference to the first aspect and the foregoing implementation manners, in some possible implementation manners, the m is determined according to any one of the following formulas:

m＝ceil(M×K₂) Wherein ceil represents rounding up; alternatively, the first and second electrodes may be,

m＝floor(M×K₂) Where floor denotes rounding down.

In another possible implementation manner, the terminal device determines the mth code block according to a preset value of M, so as to determine the first time unit, where M is a positive integer and is smaller than M.

With reference to the first aspect and the foregoing implementation manners, in some possible implementation manners, the first time unit is an L-th time unit after a second time unit, where the second time unit is a last time unit used for transmitting a demodulation reference signal corresponding to the transport block, and L is a positive integer.

With reference to the first aspect and the foregoing implementation manners, in some possible implementation manners, before determining the first time unit in N time units corresponding to the slave transport block, the method further includes: determining that the value of N is greater than or equal to a preset first threshold; and/or determining that the number M of code blocks included in the transport block is greater than or equal to a preset second threshold; and/or determining that the transport block is not configured with an additional demodulation reference signal.

In the actual processing process, any one of a plurality of methods may be used to determine whether the feedback information needs to be transmitted in advance, any two of the plurality of methods may also be used to determine whether the feedback information needs to be transmitted in advance, or three methods may also be used to determine whether the feedback information needs to be transmitted in advance, which is not limited in this application.

In another possible implementation manner, the terminal device may also default to transmit the feedback information in advance.

By the scheme, the terminal equipment and the base station can determine whether the feedback information needs to be transmitted in advance or not by combining the transmission resources of the transmission block and/or the number of code blocks included in the transmission block, so that the feedback information is transmitted in advance under the condition that the data retransmission delay can be reduced by transmitting the feedback information in advance, the data transmission delay is reduced, and the reliability of data transmission is improved. The transmission resource of the transport block herein may include the number of time units, the number of symbols, and the configuration of DMRS in which the transport block is transmitted.

In a second aspect, a method for transmitting feedback information is provided, including: determining a first time unit from N time units corresponding to a transmission block, wherein the first time unit is one of the N time units, and N is a positive integer; receiving, at the first time unit, feedback information of the transport block.

With reference to the second aspect, in certain implementations of the second aspect, the first time unit is an nth time unit of the N time units, N is a positive integer less than or equal to N, N is a value according to the N and a first scaling factor K₁And (4) determining.

With reference to the second aspect and the foregoing implementation manner, in some possible implementation manners, the n is determined according to any one of the following formulas:

n＝floor(N×K₁) Where floor denotes rounding down.

With reference to the second aspect and the foregoing implementation manners, in some possible implementation manners, the first time unit is an nth time unit of the N time units, and N is a preset positive integer smaller than or equal to N.

With reference to the second aspect and the foregoing implementation manners, in some possible implementation manners, the transport block includes M code blocks, the first time unit is a last time unit corresponding to an mth code block of the M code blocks, where a value of M is determined according to a value of M and a second scaling coefficient K₂And (4) determining.

With reference to the second aspect and the foregoing implementation manner, in some possible implementation manners, the m is determined according to any one of the following formulas:

m＝floor(M×K₂) Wherein floor representsAnd rounding down.

With reference to the second aspect and the foregoing implementation manners, in some possible implementation manners, the first time unit is an lth time unit after a second time unit, where the second time unit is a last time unit used for transmitting a demodulation reference signal corresponding to the transport block, and L is a positive integer.

With reference to the second aspect and the foregoing implementation manners, in some possible implementation manners, before determining the first time unit in the N time units corresponding to the slave transport block, the method further includes: determining that the value of N is greater than or equal to a preset first threshold; and/or determining that the number M of code blocks included in the transport block is greater than or equal to a preset second threshold; and/or determining that the transport block is not configured with an additional demodulation reference signal.

In a third aspect, a communication device is provided, which has the function of implementing the terminal equipment in the method design of the first aspect. These functions may be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

In a fourth aspect, a communication device is provided, which has the function of implementing the network equipment (e.g. base station) in the method design of the second aspect. These functions may be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

In a fifth aspect, a terminal device is provided that includes a transceiver and a processor. Optionally, the terminal device further comprises a memory. The processor is configured to control the transceiver to transceive signals, the memory is configured to store a computer program, and the processor is configured to call and execute the computer program from the memory, so that the terminal device performs the method of the first aspect or any one of the possible implementation manners of the first aspect.

In a sixth aspect, a network device is provided that includes a transceiver and a processor. Optionally, the terminal device further comprises a memory. The processor is configured to control the transceiver to transmit and receive signals, the memory is configured to store a computer program, and the processor is configured to call and run the computer program from the memory, so that the terminal device executes the method of the second aspect or any one of the possible implementation manners of the second aspect.

In a seventh aspect, a communication system is provided, which includes the terminal device of the third aspect and the network device of the fourth aspect; alternatively, the system comprises the terminal device of the fifth aspect and the network device of the sixth aspect.

In an eighth aspect, a communication apparatus is provided, which may be a terminal device designed by the method or a chip provided in the terminal device. The communication device includes: a processor, coupled to the memory, and configured to execute the instructions in the memory to implement the method performed by the terminal device in the first aspect or any one of the possible implementation manners of the first aspect. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being coupled to the communication interface.

When the communication device is a terminal device, the communication interface may be a transceiver, or an input/output interface.

When the communication device is a chip configured in a terminal device, the communication interface may be an input/output interface.

Alternatively, the transceiver may be a transmit-receive circuit. Alternatively, the input/output interface may be an input/output circuit.

In a ninth aspect, a communication apparatus is provided, which may be a network device designed by the method, or a chip disposed in the network device. The communication device includes: a processor, coupled to the memory, and configured to execute the instructions in the memory to implement the method performed by the network device in the second aspect or any one of the possible implementations of the second aspect. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being coupled to the communication interface.

When the communication device is a network device, the communication interface may be a transceiver, or an input/output interface.

When the communication device is a chip configured in a network device, the communication interface may be an input/output interface.

In a tenth aspect, there is provided a computer program product comprising: computer program code which, when run on a computer, causes the computer to perform the method of the above-mentioned aspects.

In an eleventh aspect, a computer-readable medium is provided, which stores program code, which, when run on a computer, causes the computer to perform the method of the above-mentioned aspects.

Drawings

Fig. 1 is a schematic architecture diagram of a mobile communication system suitable for use in the embodiments of the present application.

Fig. 2 is a schematic diagram of an example transport block and code block according to an embodiment of the present disclosure.

Fig. 3 is a schematic configuration diagram of an example DMRS according to an embodiment of the present application.

Fig. 4 is a schematic interaction diagram of an example transmission method of feedback information according to an embodiment of the present application.

Fig. 5 is a schematic diagram of another example of transmission block division according to an embodiment of the present application.

Fig. 6 is a schematic diagram of an example transmission apparatus for feedback information according to an embodiment of the present application.

Fig. 7 is a schematic diagram of another example of a transmission apparatus for feedback information according to an embodiment of the present application.

Fig. 8 is a schematic diagram of another example of a transmission apparatus for feedback information according to an embodiment of the present application.

Fig. 9 is a schematic diagram of another example of a transmission apparatus for feedback information according to an embodiment of the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a Long Term Evolution (LTE) system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD) system, a fifth generation (5th generation, 5G) mobile communication system, a New Radio (NR) communication system, a future mobile communication system, and the like.

Fig. 1 is a schematic architecture diagram of a mobile communication system suitable for use in the embodiments of the present application. As shown in fig. 1, the mobile communication system 100 may include a core network device 110, a radio access network device 120, and at least one terminal device (e.g., terminal device 130 and terminal device 140 in fig. 1). The terminal equipment is connected with the wireless access network equipment in a wireless mode, and the wireless access network equipment is connected with the core network equipment in a wireless or wired mode. The core network device and the radio access network device may be separate physical devices, or the function of the core network device and the logical function of the radio access network device may be integrated on the same physical device, or a physical device may be integrated with a part of the function of the core network device and a part of the function of the radio access network device. The terminal equipment may be fixed or mobile. Fig. 1 is a schematic diagram, and other network devices, such as a wireless relay device and a wireless backhaul device, may also be included in the communication system, which are not shown in fig. 1. The embodiments of the present application do not limit the number of core network devices, radio access network devices, and terminal devices included in the mobile communication system.

In the mobile communication system 100, the radio access network device 120 is an access device that the terminal device accesses to the mobile communication system wirelessly. The radio access network device 120 may be: a base station, an evolved node B (enb), a home base station, an Access Point (AP), a wireless relay node, a wireless backhaul node, a Transmission Point (TP), a Transmission and Reception Point (TRP) in a wireless fidelity (WIFI) system, and the like, and may also be a gNB in an NR system, or may also be a component or a part of a device constituting the base station, such as a Central Unit (CU), a Distributed Unit (DU), or a baseband unit (BBU). It should be understood that, in the embodiments of the present application, there is no limitation on the specific technology and the specific device form adopted by the radio access network device. In this application, a radio access network device is referred to as a network device for short, and if no special description is provided, network devices are referred to as radio access network devices in this application. In this application, the network device may refer to the network device itself, or may be a chip applied to the network device to complete a wireless communication processing function.

The terminal equipment in the mobile communication system 100 may also be referred to as a terminal, a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), and the like. The terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, or a wireless terminal applied to Virtual Reality (VR), Augmented Reality (AR), industrial control (industrial control), unmanned driving (self driving), remote medical (remote medical), smart grid (smart grid), transportation safety (transportation safety), smart city (smart city), and smart home (smart home). The terminal device and the chip applicable to the terminal device are collectively referred to as a terminal device in the present application. It should be understood that the embodiment of the present application does not limit the specific technology and the specific device form adopted by the terminal device.

The embodiments of the present application may be applicable to downlink data transmission, may also be applicable to uplink data transmission, and may also be applicable to device-to-device (D2D) data transmission. For downlink data transmission, the sending device of the data is a network device, the receiving device of the data is a terminal device, and after receiving the downlink data, the terminal device sends feedback information to the network device to inform the network device whether the downlink data is correctly received by the terminal device. For uplink data transmission, the sending device of data is a terminal device, the receiving device of data is a network device, and after receiving the uplink data, the network device sends feedback information to the terminal device to notify the terminal device whether the uplink data is correctly received by the network device. For the signal transmission of D2D, the sending device of data is a terminal device, and the receiving device of data is also a terminal device. The transmission direction of the data in the embodiments of the present application is not limited.

It should be understood that the manner, the case, the category, and the division of the embodiments are only for convenience of description and should not be construed as a particular limitation, and features in various manners, the category, the case, and the embodiments may be combined without contradiction.

It should also be understood that "first", "second", and "third" in the embodiments of the present application are merely for distinction and should not constitute any limitation to the present application. For example, the "first time unit" in the embodiment of the present application indicates a time when the feedback information is transmitted.

It should also be understood that, in the various embodiments of the present application, the sequence numbers of the processes do not mean the execution sequence, and the execution sequence of the processes should be determined by the functions and the inherent logic of the processes, and should not constitute any limitation to the implementation process of the embodiments of the present application.

It should be further noted that, in this embodiment of the present application, "preset" or "predefined" may be implemented by saving a corresponding code, table, or other means that can be used to indicate related information in advance in a device (for example, including a terminal device and a network device), and this application is not limited to a specific implementation manner thereof, for example, a preset value, a preset constant, a preset first threshold, a preset second threshold, and the like in this embodiment of the present application.

It should be noted that, in the embodiment of the present application, the "feedback information" may also be referred to as "Negative Acknowledgement (NACK)", for example, for a terminal device, transmission of the feedback information may also be understood as transmission of NACK. In addition, NACK may be transmitted through a physical uplink channel.

It should be further noted that "and/or" describes an association relationship of the associated object, indicating that there may be three relationships, for example, a and/or B, which may indicate: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. The technical solution provided by the present application will be described in detail below with reference to the accompanying drawings.

In order to facilitate understanding of the embodiments of the present application, a brief description of several concepts involved in the present application is provided below.

1. Time unit and time domain symbol

The time domain resources used by the base station and the terminal device for wireless communication may be divided into a plurality of time units. In the embodiment of the present application, the plurality of time units may be consecutive, or some adjacent time units may have a preset interval therebetween, and the embodiment of the present application is not particularly limited.

In the embodiment of the present application, the length of one time unit is not limited. For example, 1 time unit may be one or more subframes; alternatively, it may be one or more time slots; alternatively, it may be one or more symbols.

In the embodiments of the present application, the symbol is also referred to as a time domain symbol, and may be an Orthogonal Frequency Division Multiplexing (OFDM) symbol, or may be a single carrier frequency division multiple access (SC-FDMA) symbol, where SC-FDMA is also referred to as an orthogonal frequency division multiplexing with transform precoding (OFDM with TP).

In the embodiment of the present application, a plurality of time units have a time sequence relationship in a time domain, and the time lengths corresponding to any two time units may be the same or different.

2. Transport Block (TB) and Code Block (CB)

There is a transport channel between a Medium Access Control (MAC) layer and a physical layer, and the physical layer provides data services to higher layers in the form of the transport channel. Generally, the MAC layer transmits data to the physical layer in units of one TB. The physical layer may process the TB data from the MAC layer and the control information of the physical layer according to a Cyclic Redundancy Check (CRC), a code block segmentation, a channel coding, a rate matching, a code block concatenation (concatenation), and the like, then perform operations such as scrambling, modulation, layer mapping, and precoding, and finally may send out through an air interface.

When the data size in the TB is large, the physical layer segments the TB to form a plurality of CBs. Specifically, the maximum code length K that can be processed in channel coding is determined in consideration of coding efficiency, encoder limitations, processing delay, and the like_max。K_maxThe bit may be 6144bit, or 8448bit, or 3840bit, etc., which is not limited in this application. K_maxOne value may be selected from different pre-configured values depending on the configuration of the code. If the length of the transmission block bit sequence added with the CRC bit is more than K_maxThe transport block needs to be partitioned to meet the channel coding requirements. A bit sequence input to the encoder to be encoded once may be referred to as one CB.

In the process of data transmission, the physical layer of the base station splits one TB into a plurality of CBs, and then encodes each CB. And after receiving the data, the terminal equipment respectively decodes each CB. If all the CBs of one TB are received correctly, the TB is considered to be received correctly, and if any one CB in one TB is received incorrectly, the TB is considered to be received incorrectly. The terminal equipment sends feedback information to the base station according to the correctness of the received TB. If the TB is received wrongly, the terminal equipment feeds back NACK to the base station; if the TB reception is correct, the terminal equipment feeds back an Acknowledgement (ACK) to the base station. When the base station receives the NACK feedback, the TB is retransmitted until the ACK feedback is received, or the configured maximum retransmission times is reached.

Fig. 2 is a schematic diagram illustrating an example of TB slicing into a plurality of CBs. As shown in fig. 2, one TB is cut into 5 CBs: CB 1, CB 2, CB 3, CB 4 and CB 5. In the existing transmission process of the ACK/NACK feedback information, if all 5 CBs included in 1 TB of the terminal device are correctly received, the terminal device sends an ACK to the base station. In other words, if ACK is to be fed back, it is necessary to wait for all of the 5 CBs included in the entire TB to be correctly received before feeding back. Therefore, the earliest feedback time of ACK is the time when CB 5 reception ends. While NACK can be fed back at an earlier time, for example, if CB 1 is received in error, NACK can be fed back immediately because NACK needs to be fed back if there is one CB error regardless of whether the following 4 CBs are received correctly or not. When the base station receives the NACK, the erroneous TB can be retransmitted immediately until the transmission is successful. Therefore, the time delay of retransmission can be reduced by feeding back NACK in advance. Therefore, the time delay of the URLLC service can be effectively reduced by adopting the technical scheme in the embodiment of the application; meanwhile, before the URLLC service is overtime, the retransmission opportunity of the URLLC service can be increased, so that the transmission reliability of the URLLC service can be improved.

However, the early feedback NACK is not applicable to all data transmission procedures, in other words, it makes sense to feed back the NACK early in not all cases. If the TB occupies few symbols, e.g. only 2 symbols, then the early feedback is meaningless, at most 1 symbol early, even if the TB has only 1 symbol, then the early feedback is not possible.

In addition, there is no scheme for feeding back NACK at present, and in the embodiment of the present application, a method for transmitting feedback information in advance is provided to determine whether the current transmission situation needs to feed back NACK in advance and to feed back NACK at a time point in advance.

3. Transmission of downlink data

The base station transmits Downlink Control Information (DCI), a demodulation reference signal (DMRS), and downlink data to the terminal apparatus. The terminal device may determine, according to the DCI, time-frequency resources used for transmitting the downlink data, time-frequency resources used for transmitting feedback information of the downlink data, and information such as a coding modulation scheme used by the downlink data. The terminal equipment can perform channel estimation according to the DMRS, and demodulate and decode the downlink data based on the result of the channel estimation and the information in the DCI.

After receiving the DMRS, the terminal device may perform channel estimation, and then demodulate the downlink data. In a Physical Downlink Shared Channel (PDSCH), multiple DMRSs may be configured, and a terminal device generally needs to complete reception of all DMRSs in a PDSCH to complete channel estimation.

If the terminal device successfully demodulates and decodes the downlink data, the terminal device successfully receives the downlink data, the terminal device generates an ACK, and the ACK is sent on the time-frequency resource indicated in the DCI; if the terminal device fails to demodulate and decode the downlink data, it indicates that the terminal device has not successfully received the downlink data, and the terminal device generates a NACK, and sends the NACK on the time-frequency resource indicated in the DCI.

Fig. 3 is a schematic configuration diagram of one possible DMRS. In fig. 3, if the terminal device is configured with additional DMRSs (additional DMRSs), such as DMRS 1 and DMRS 2, the earliest feedback time of NACK may start to feed back NACK at the time when DMRS 2 is completely received, that is, after the last symbol occupied by DMRS 2 is ended. In this case, even if NACK is fed back in advance, the timing of NACK feedback is already close to the timing at which reception of all transport blocks is completed, and the significance is not great. If the terminal device is only configured with one DMRS, such as DMRS 3, the earliest NACK feedback time is at the time when DMRS 3 reception is completed, and at this time, if NACK is fed back in advance, the delay of data retransmission can be reduced.

In order to reduce the time delay of data retransmission, embodiments of the present application provide a method for transmitting feedback information, where a time when a data receiving device sends feedback information in advance is determined, that is, a first time unit is determined, so that the data receiving device sends the feedback information in the first time unit, and the data sending device receives the feedback information, for example, NACK, in the first time unit. Therefore, the data transmitting equipment can retransmit the data in advance, and the retransmission time delay of the data is further reduced. For the service data which is required to be transmitted correctly in a certain time, the retransmission time delay of the data is reduced, which means that the retransmission times can be increased under the requirement of a certain time delay, and the reliability of data transmission is further improved. In the embodiment of the present application, the following data transmission is described as an example, that is, a base station is taken as a sending device of data, and a terminal device is taken as a receiving device of data, and it is understood that the embodiment of the present application may also be applied to uplink data transmission, and may also be applied to data transmission of D2D.

First, a method for determining whether feedback information needs to be transmitted in advance, which is provided in the embodiments of the present application, is described, and the method is described in detail below from the perspective of a terminal device. It will be appreciated that the method is equally applicable to a base station as a transmitting device for data.

Method 1

And when the terminal equipment determines that the value of the time unit number N included in the transmission resources of the transmission block is greater than or equal to a preset first threshold, determining that the feedback information needs to be transmitted in advance. A transport block corresponds to N time units, where the N time units are used to transmit the transport block.

Optionally, one time unit is one symbol. And when the value of the number of symbols N included in the transmission block is greater than or equal to a preset first threshold, the terminal equipment determines that the feedback information needs to be transmitted in advance. In particular, passing a preset first threshold n₁When N is greater than or equal to N₁If not, the advanced transmission is not started. It should be understood that the terminal device may accurately know information of the transport block, including, for example, the number of time units or the number of symbols N in which the transport block is transmitted, through the DCI. For example, a first threshold n₁When the number N of time units corresponding to the transmission block is greater than or equal to 5, for example, corresponding to 8 time units, the terminal device determines that the feedback information needs to be transmitted in advance.

It should be understood that the first threshold may be a preset constant, a constant configured by higher layer signaling, or a constant configured through physical layer signaling. In the embodiment of the present application, the higher layer signaling may be Radio Resource Control (RRC) signaling or MAC layer signaling; the physical layer signaling may be DCI.

Method two

And when the terminal equipment determines that the value of the number M of the code blocks included in the transmission block is greater than or equal to a preset second threshold, determining that the feedback information needs to be transmitted in advance.

When M is greater than or equal to a preset second threshold M₁If so, the NACK is started to be transmitted in advance, otherwise, the NACK is not started to be transmitted in advance. It should be understood that the terminal device may accurately know the information of the transport block through the DCI, for example, the terminal device may explicitly know the number M of code blocks included in the transport block. For example, the second threshold m₁When the number M of code blocks included in the transport block is greater than or equal to 5, for example, 7 code blocks are included, the terminal device determines that the feedback information needs to be transmitted in advance.

It should be understood that the second threshold may be a preset constant, or a constant configured by higher layer signaling, and the second threshold may also inform the terminal device through physical layer signaling, such as DCI. This is not limited in this application.

Method III

And when the terminal equipment determines that the data transmission is not configured with the extra demodulation reference signal, determining that the feedback information needs to be transmitted in advance.

As described above, in the process of receiving downlink data by the terminal device, the terminal device must receive the DMRS first before decoding. Currently, DMRS configuration of a terminal device can be divided into two cases as shown in fig. 3, one case is a case where an additional DMRS is configured. For this case, when the DMRS is completely received, all time elements corresponding to the TB are already nearly completely received, and the meaning of transmitting the feedback information in advance is not significant. And the other one is that only the front DMRS is configured, and after the DMRS is successfully received, a period of time is left until the TB is completely received, so that early transmission can be started.

In addition, the terminal device may know the DMRS configuration in advance, for example, the terminal device may know whether the data transmission is configured with the additional DMRS through high-level signaling or DCI. The specific method for the terminal device to acquire the DMRS configuration condition is not limited in the present application.

Method IV

And the terminal equipment determines whether the feedback information needs to be transmitted in advance according to the configuration of the base station.

In addition to the above three methods for determining whether the terminal device needs to transmit the feedback information in advance, the base station may determine whether the terminal device starts to transmit the feedback information in advance. For example, the base station may send an indication message to the terminal device to instruct the terminal device to transmit the feedback information in advance.

Specifically, the base station may instruct the terminal device to transmit the feedback information in advance through a high-level signaling; the base station may also notify the terminal device to transmit the feedback information in advance through physical layer signaling.

Optionally, the terminal device may also default to transmit the feedback information in advance.

In the actual processing process, it should be understood that any one of the above methods may be used to determine whether the terminal device needs to transmit the feedback information in advance, or any two of the above methods may be used to determine whether the terminal device needs to transmit the feedback information in advance, or three methods may be used to determine whether the terminal device needs to transmit the feedback information in advance, which is not limited in this application.

Fig. 4 is a schematic interaction diagram of an example transmission method 400 of feedback information according to an embodiment of the present application. Each step of the method 400 is described in detail below.

It should be understood that in the embodiment of the present application, the terminal device and the base station are taken as the execution subjects of executing the method 400, and the method 400 is explained. By way of example and not limitation, the execution subject of the execution method 400 may also be a chip applied to a terminal device and a chip applied to a base station.

S410, the base station sends the transmission block to the terminal equipment. The transport blocks correspond to N time units, N being a positive integer.

A transport block corresponds to N time units, which can be understood as a time domain resource for transmitting the transport block being N time units.

S420, determining a first time unit from N time units corresponding to the transmission block, where the first time unit is a time unit of the N time units, and N is a positive integer.

As shown in fig. 5, the time domain resource for transmitting the transport block is N time units. In the existing scheme, the time point when the terminal device sends the feedback information is after the transmission block is completely received, for example, after the end position of time unit N in fig. 5. In order to reduce the delay of data transmission, the feedback information may be sent in advance, but the time when the feedback information is sent is not explicitly advanced. In the embodiment of the present application, the time when the feedback information is sent is referred to as a first time unit, that is, the feedback information is sent in the first time unit. In S420, the first time unit may be determined by any one of the following three methods.

Method 1

When a transport block corresponds to N time units, it is assumed that the first time unit is the nth time unit of the N time units, and N is a positive integer less than or equal to N. The value of n may be determined by the following method, thereby determining the nth time unit as the first time unit. Wherein N is determined according to the value of the time unit number N corresponding to the transmission block.

It should be understood that the embodiment of the present application does not limit the execution subject of determining the value of n. For example, the terminal device may determine the value of the time unit number N corresponding to the transport block, and then notify the base station of the value of N; or the base station determines according to the value of the time unit number N corresponding to the transmission block and then notifies the value of N to the terminal equipment; or the terminal device and the base station may both determine the value of n according to an agreed method, thereby ensuring that the values of n determined by the terminal device and the base station are equal.

Optionally, N is a value according to the time unit number N corresponding to the transport block and N isA coefficient of proportionality K₁And (4) determining.

Alternatively, K₁May be a preset value. For example, K₁0.5, 0.75, etc.

Specifically, the value of n may be determined according to the following formula, and the nth time unit may be further determined as the first time unit.

(1)n＝N×K₁E.g. K₁0.5, N is 12, then N is N × K₁12 × 0.5 ═ 6, the feedback information is sent in the 6 th symbol after the start symbol of the transport block. This calculation method may be used in a case such that the obtained calculation result n is a positive integer.

(2)n＝ceil(N×K₁) Wherein ceil means rounding up, or is represented as "

". For example, K₁0.5, N13, then N ceil (N × K)₁) When ceil (13 × 0.5) ═ 7, feedback information is sent in the 7 th symbol where the transport block is transmitted.

(3)n＝floor(N×K₁) Wherein floor means rounding down, or means "

". For example, K₁0.5, N13, then N ceil (N × K)₁) When ceil (13 × 0.5) ═ 6, feedback information is sent in the 6 th symbol where the transport block is transmitted.

In another possible implementation manner, N may be a preset value, may also be configured through higher layer signaling, and may also be configured through physical layer signaling, where N is a positive integer less than or equal to N. The present application does not limit the configuration method of n.

Method two

When the transport block includes M code blocks, the first time unit is the last time unit corresponding to the mth code block of the M code blocks, wherein the value of M is determined according to the value of the number M of the code blocks included in the transport block.

It should be understood that the embodiment of the present application does not limit the execution subject of determining the value of m. For example, the terminal device may determine according to the value of the number M of code blocks included in the transport block, and then notify the base station of the value of M; or the base station determines according to the value of the number M of code blocks included in the transport block, and then notifies the value of M to the terminal device; or the terminal device and the base station may both determine the value of m according to an agreed method, so as to ensure that the values of m determined by the terminal device and the base station are equal.

Optionally, M is a value according to the number M of code blocks included in the transport block and a second scaling factor K₂And (4) determining.

Alternatively, K₂May be a preset value. For example, K₂0.5, 0.75, etc.

Specifically, the value of m may be determined according to the following formula, and the last time unit corresponding to the mth code block may be further determined as the first time unit.

(1)m＝M×K₂E.g. K₂0.5, M is 12, then M is mxk₂And 12 × 0.5 ═ 6, for the transport block, sending feedback information in the last time unit corresponding to the end position of the 6 th code block. This calculation method may be used in a case such that the obtained calculation result m is a positive integer.

(2)m＝ceil(M×K₂) Wherein ceil means rounding up, or is represented as "

". For example, K₂0.5, M13, then M ceil (M × K)₂) When ceil (13 × 0.5) ═ 7, for the transport block, the feedback information is sent in the last time unit corresponding to the end position of the 7 th code block.

(3)m＝floor(M×K₂) Wherein floor means rounding down, or means "

". For example, K₂0.5, M13, then M ceil (M × K)₂) When ceil (13 × 0.5) ═ 6, thenAnd for the transport block, sending feedback information in the last time unit corresponding to the end position of the 6 th code block.

In another possible implementation manner, M may be a preset value, configured through higher layer signaling, or configured through physical layer signaling, where M is a positive integer smaller than M. The present application does not limit the configuration method of m.

Method III

The first time unit is the L-th time unit after the second time unit, where the second time unit is the last time unit used for transmitting the demodulation reference signal corresponding to the transport block, and L is a positive integer.

It should also be understood that the embodiment of the present application is not limited to determining the execution subject of the second time unit. For example, the terminal device may determine a second time unit according to the demodulation reference signal corresponding to the transport block, and then notify the base station of the second time unit; or the base station determines a second time unit according to the demodulation reference signal corresponding to the transmission block, and then notifies the terminal device of the second time unit; the terminal device and the base station may determine the second time unit according to an agreed method, so as to ensure that the second time units determined by the terminal device and the base station are the same.

For example, the terminal device determines the L-th symbol corresponding to the last symbol occupied by the DMRS of the transmission block₀If the time unit is the second time unit, the first time unit can be the Lth time unit₀The time of sending the feedback information is positioned at the L-th time unit after the L-th time unit₀+ L time units.

Alternatively, the L time units may correspond to a period in which the terminal device processes downlink data. In the process of receiving downlink data, the terminal device may perform channel estimation after receiving the DMRS, and then perform demodulation and decoding on the downlink data based on the result of the channel estimation and the DCI information, so that the specific meaning of the L time units may be defined as any one of the following:

definition 1, the time period for processing the downlink data includes the time period occupied by the terminal device for channel estimation and demodulation and decoding of the downlink data.

Definition 2, the time period for processing the downlink data includes the time period occupied by the terminal device for demodulating and decoding the downlink data.

The embodiment of the application does not limit the processing time period for the terminal equipment to process the downlink data.

Alternatively, L may be a preset constant, may be configured by higher layer signaling, and may also be configured through physical layer signaling.

It should be understood that, for the convenience of understanding, several possible implementations of determining the first time unit are described in detail by taking the first time unit as an example, but this should not limit the present application in any way. The terminal device and the base station may transmit the feedback information through one time unit, or may transmit the feedback information through a plurality of time units. Specifically, when the terminal device transmits the feedback information by a plurality of time units, the first time unit may be any one of the plurality of time units, and the terminal device may determine a period for transmitting the feedback information according to the first time unit. For example, the first time unit may be a first time unit of the plurality of time units; or the first time unit may be a last time unit of the plurality of time units; or the first time unit may be a middle time unit of the plurality of time units, and the terminal device and the base station may determine the time periods corresponding to the plurality of time units according to the determined first time unit.

S430, the terminal device sends the feedback information of the transport block in the first time unit. Accordingly, the base station receives feedback information for the transport block at the first time unit.

The first time unit for sending the feedback information of the transport block is determined by S420, and the terminal device sends the feedback information on the first time unit, and the base station correspondingly determines the first time unit on which the feedback information is received. And after receiving the feedback information, the base station retransmits the transmission block.

With the above scheme, the terminal device does not need to wait until the entire transmission block is completely received before sending the feedback information, but can determine the time for transmitting the feedback information in advance, that is, the first time unit. The first time unit may be one of N time units for transmitting the transport block, that is, the feedback information may be sent while receiving the transport block. Compared with the prior art, the method and the device can reduce the time delay which is possibly brought by sending the feedback information after the transmission of the whole transmission block is finished. In general, the time delay of data retransmission can be reduced, and the reliability of data transmission can be improved.

In addition, the terminal device and the base station can determine whether to transmit the feedback information in advance according to the transmission resources of the transmission block and/or the number of code blocks included in the transmission block, so that the feedback information is transmitted in advance under the condition that the feedback information is transmitted in advance to reduce the data retransmission delay, the data transmission delay is reduced, and the reliability of data transmission is improved. The transmission resource of the transport block herein may include the number of time units, the number of symbols, and the configuration of DMRS in which the transport block is transmitted.

It should be understood that the above-described determination of whether the feedback information needs to be sent in advance and the determination of the timing for sending the feedback information in advance may be applied to the data transmission process separately or may be applied to the same data transmission process in combination. For example, in any data transmission process, the feedback information is transmitted in advance, and only the method 400 for determining the time to send the feedback information in advance is applied; or, only the method of whether the feedback information needs to be sent in advance is used for judging whether to start the advance transmission; or, in the process of transmitting data, whether to start the early transmission is determined by a method of whether to send the feedback information in advance, and when the feedback information needs to be sent in advance, the time of sending and receiving the feedback information is determined by the above method 400 of determining the time of sending the feedback information in advance. This is not limited in this application.

The transmission method of the feedback information according to the embodiment of the present application is described in detail above with reference to fig. 2 to 5. Hereinafter, a transmission apparatus of feedback information according to an embodiment of the present application will be described in detail with reference to fig. 6 to 9.

Fig. 6 shows a schematic block diagram of an apparatus 600 for transmitting feedback information according to an embodiment of the present application, where the apparatus 600 may correspond to the terminal device described in the method 400, or may be a chip or a component applied to the terminal device, and each module or unit in the apparatus 600 is respectively configured to execute each action or process performed by the terminal device in the method 400, as shown in fig. 6, the apparatus 600 may include: a determination unit 610 and a communication unit 620.

The determining unit 610 is configured to determine a first time unit from N time units corresponding to a transport block, where the first time unit is a time unit of the N time units, and N is a positive integer.

The communication unit 620 is configured to receive feedback information of the transport block at the first time unit.

Specifically, the determining unit 610 is configured to execute S420 in the method 400, the communication unit 620 is configured to execute S410 and S430 in the method 400, and specific processes of the units for executing the corresponding steps are already described in detail in the method 400, and are not repeated herein for brevity.

Fig. 7 shows a schematic block diagram of an apparatus 700 for transmitting feedback information according to an embodiment of the present application, where the apparatus 700 may correspond to (e.g., may be applied to or is itself a base station described in the method 400, and each module or unit in the apparatus 700 is respectively configured to perform each action or process performed by the base station in the method 400, as shown in fig. 7, the communication apparatus 700 may include: a determination unit 710 and a communication unit 720.

The determining unit 710 is configured to determine a first time unit from N time units corresponding to a transport block, where the first time unit is a time unit of the N time units, and N is a positive integer.

The communication unit 720 is configured to receive feedback information of the transport block at the first time unit.

Specifically, the determining unit 710 is configured to execute S420 in the method 400, the communication unit 720 is configured to execute S410 and S430 in the method 400, and the specific processes of the units for executing the corresponding steps are already described in detail in the method 400, and are not repeated herein for brevity.

Fig. 8 is a schematic structural diagram of a terminal device 800 according to an embodiment of the present application. As shown in fig. 8, the terminal device 800 includes a processor 810 and a transceiver 820. Optionally, the terminal device 800 further comprises a memory 830. Wherein, the processor 810, the transceiver 820 and the memory 830 communicate with each other via the internal connection path to transmit control and/or data signals, the memory 830 is used for storing computer programs, and the processor 810 is used for calling and running the computer programs from the memory 830 to control the transceiver 820 to transmit and receive signals.

The processor 810 and the memory 830 may be combined into a processing device, and the processor 810 is configured to execute the program codes stored in the memory 830 to implement the functions of the terminal device in the above method embodiments. In particular implementations, the memory 830 may be integrated with the processor 810 or may be separate from the processor 810. The transceiver 820 may be implemented by way of transceiver circuitry.

The terminal device may further include an antenna 840, configured to send out uplink data or uplink control signaling output by the transceiver 820 through a wireless signal, or send received downlink data or downlink control signaling to the transceiver 820 for further processing.

It should be understood that the apparatus 800 may correspond to a terminal device in the method 400 according to the embodiment of the present application, and the apparatus 800 may also be a chip or a component applied to the terminal device. Moreover, each module in the apparatus 800 implements the corresponding flow in the method 400 in fig. 4, specifically, the memory 830 is configured to store a program code, so that when the processor 810 executes the program code, the processor 810 is controlled to execute the step S420 in the method 400, the transceiver 820 is configured to execute the step S410 and the step S430 in the method 400, and a specific process of each unit executing the corresponding step is described in detail in the method 400, which is not repeated herein for brevity.

Fig. 9 is a schematic structural diagram of a network device 900 according to an embodiment of the present application. As shown in fig. 9, the network device 900 (e.g., a base station) includes a processor 910 and a transceiver 920. Optionally, the network device 900 also includes a memory 930. Wherein, the processor 910, the transceiver 920 and the memory 930 communicate with each other via the internal connection path to transmit control and/or data signals, the memory 930 is used for storing a computer program, and the processor 910 is used for retrieving and running the computer program from the memory 930 to control the transceiver 920 to transmit and receive signals.

The processor 910 and the memory 930 may be combined into a processing device, and the processor 910 is configured to execute the program codes stored in the memory 930 to implement the functions of the base station in the above-described method embodiments. In particular implementations, the memory 930 may be integrated with the processor 910 or may be separate from the processor 910. The transceiver 920 may be implemented by way of transceiver circuitry.

The network device may further include an antenna 940, configured to send out the downlink data or the downlink control signaling output by the transceiver 920 through a wireless signal, or send the uplink data or the uplink control signaling to the transceiver 820 for further processing after receiving the uplink data or the uplink control signaling.

It should be understood that the apparatus 900 may correspond to a base station in the method 400 according to the embodiment of the present application, and the apparatus 900 may also be a chip or a component applied to the base station. Moreover, each module in the apparatus 900 implements the corresponding flow in the method 400 in fig. 4, specifically, the memory 930 is configured to store a program code, so that when the processor 910 executes the program code, the processor 910 is controlled to execute the step S420 in the method 400, the transceiver 920 is configured to execute the step S410 and the step S430 in the method 400, and a specific process of each unit executing the corresponding step is described in detail in the method 400, which is not described herein again for brevity.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and no further description is provided herein.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and the division of the unit is only one logical functional division, and there may be other division ways in actual implementation, for example, a plurality of units or components may be combined. In addition, the shown or discussed coupling or communication connections between each other may be indirect coupling or communication connections through some interfaces, devices or units.

In addition, functional units in the embodiments of the present application may be integrated into one physical entity, or each unit may correspond to one physical entity separately, or two or more units may be integrated into one physical entity.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

Claims

1. A method for transmitting feedback information, comprising:

determining a first time unit from N time units corresponding to a transmission block, wherein the first time unit is one of the N time units, and N is a positive integer;

transmitting feedback information of the transport block on the first time unit;

wherein the first time unit is the nth time unit of the N time units, N is a positive integer less than or equal to N, and N is a value according to the N and a first scaling factor K₁Determining; alternatively, the first and second electrodes may be,

the first time unit is a last time unit corresponding to an mth code block of M code blocks included in the transport block, wherein a value of M is a value according to the value of M and a second scaling coefficient K₂Determining; alternatively, the first and second electrodes may be,

the first time unit is the lth time unit after the second time unit, wherein the second time unit is the last time unit used for transmitting the demodulation reference signal corresponding to the transport block, and L is a positive integer.

2. A method for transmitting feedback information, comprising:

receiving feedback information of the transport block at the first time unit;

3. The method of claim 1 or 2, wherein n is determined according to any one of the following equations:

n＝floor(N×K₁) Where floor denotes rounding down.

4. The method of claim 1 or 2, wherein m is determined according to any one of the following equations:

m＝floor(M×K₂) Where floor denotes rounding down.

5. The method according to claim 1 or 2, wherein before determining the first time unit from the N time units corresponding to the slave transport block, the method further comprises:

determining that the value of N is greater than or equal to a preset first threshold; and/or

Determining that the number M of code blocks included in the transport block is greater than or equal to a preset second threshold; and/or

Determining that the transport block is not configured with an additional demodulation reference signal.

6. A communications apparatus, comprising:

a determining unit, configured to determine a first time unit from N time units corresponding to a transport block, where the first time unit is a time unit of the N time units, and N is a positive integer;

a communication unit, configured to send feedback information of the transport block in the first time unit;

7. A communications apparatus, comprising:

a communication unit, configured to receive, at the first time unit, feedback information of the transport block;

8. The apparatus of claim 6 or 7, wherein n is determined according to any one of the following equations:

n＝floor(N×K₁) Where floor denotes rounding down.

9. The apparatus of claim 6 or 7, wherein m is determined according to any one of the following equations:

m＝floor(M×K₂) Where floor denotes rounding down.

10. The apparatus according to claim 6 or 7, wherein the determining unit is further configured to, before determining the first time unit from the N time units corresponding to the transport block:

11. A computer-readable storage medium, characterized in that it stores a computer program which, when executed, implements the method of any one of claims 1 to 5.

12. A chip system, comprising:

a memory to store instructions;

a processor configured to retrieve and execute the instructions from the memory, so that a communication device on which the system-on-chip is installed performs the method according to any one of claims 1 to 5.