CN107154842B

CN107154842B - HARQ feedback method, HARQ feedback device, network side equipment and terminal

Info

Publication number: CN107154842B
Application number: CN201710588781.4A
Authority: CN
Inventors: 付婷
Original assignee: Meizu Technology Co Ltd
Current assignee: Meizu Technology Co Ltd
Priority date: 2017-07-19
Filing date: 2017-07-19
Publication date: 2020-09-29
Anticipated expiration: 2037-07-19
Also published as: CN107154842A

Abstract

The invention provides a HARQ feedback method, a HARQ feedback device, network side equipment and a terminal, wherein the HARQ feedback method for the network side equipment comprises the following steps: when data is transmitted by adopting an sTTI, transmitting downlink data to a terminal on a downlink subframe sTTI n, wherein the processing time delay of the terminal aiming at the HARQ ACK/NACK feedback of the downlink data is k sTTI; and when the data transmission by adopting the sTTI is switched to the data transmission by adopting the TTI, and the terminal cannot complete the HARQ ACK/NACK feedback of the downlink data on an uplink subframe sTTI n + k, configuring the terminal to perform the HARQ ACK/NACK feedback on the downlink data on the first TTI subframe meeting the processing delay. By the technical scheme of the invention, the time delay of HARQ feedback can be effectively reduced, and the spectrum efficiency is improved.

Description

HARQ feedback method, HARQ feedback device, network side equipment and terminal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a HARQ feedback method, a HARQ feedback apparatus, a network side device, and a terminal.

Background

With the development of the mobile internet, a large number of application services satisfying various specific functions are emerging. Some of the services have low requirements on data delay, such as sending and receiving mails, downloading movies, etc.; however, there are other services that have strict requirements on data delay, such as online games, robbery, red packet robbery, etc., and these services usually require the user data delay to be as short as possible. In an LTE (Long Term Evolution) network, a Transmission Time Interval (TTI) is an important indicator that affects user data delay. The current LTE system uses a TTI of 1ms, i.e., one subframe, and has 14 OFDM (Orthogonal Frequency Division Multiplexing) symbols in a normal Cyclic Prefix (CP) and 12 OFDM symbols in an extended Cyclic Prefix. In specific application, the sending end sends a data block once every 1ms, and the receiving end can receive a data block every 1 ms.

The use of shorter TTI in LTE system is established in 3GPP (3rd Generation Partnership Project) RAN (Radio Access Network) #69 conference, and the feasibility and possible beneficial effects of using shorter TTI (short TTI, hereinafter abbreviated to sTTI) are studied. Some documents such as [ R1-160942] and [ R1-160930] quantitatively study the influence of the reduction of the TTI duration on the data delay of the LTE system, and analysis shows that the TTI duration is used not only to shorten the transmission time interval of the base station and the terminal, but also the data processing time corresponding to the transmission time interval is correspondingly reduced, for example, the data coding modulation and data demodulation time are reduced along with the reduction of the data block size. At present, only 2 or 3 OFDM symbols may be included in one sTTI, which results in large overhead of control signaling and low spectrum efficiency, and is mainly used for applications with high requirements on delay. The 1ms TTI has higher frequency spectrum efficiency due to smaller overhead of control signaling, and is suitable for application with low requirement on time delay.

In subsequent applications, a terminal in an LTE network may need to dynamically switch between two transmission intervals, a shorter sTTI and a 1ms TTI. When the sTTI to TTI switch occurs, the ACK/NACK feedback of the unfinished HARQ (Hybrid Automatic repeat request) process will be affected.

In an LTE network using sTTI, for downlink data transmitted on a subframe sTTI n, corresponding HARQ ACK (Acknowledgement)/NACK (Negative Acknowledgement) feedback occurs in sTTI n + k, a specific value of k is not determined at present, and the size of k is related to a duration of one subframe sTTI, and only a processing delay of the sTTI that satisfies the duration is required. In TTI, for downlink data transmitted on subframe TTI n, the corresponding harq ack/NACK feedback occurs in TTI n + 4. Taking the dynamic switching of sTTI containing 2 OFDM symbols to 1ms TTI, k is 6 as an example, the HARQ ACK/NACK feedback timing is as shown in fig. 1, the HARQ ACK/NACK feedback occurs in the subframes sTTI 6 and sTTI 7 for downlink data transmitted in the subframes sTTI 0 and sTTI 1, and for the sTTI after the subframe sTTI 1, there is no corresponding resource for performing HARQ ACK/NACK feedback due to the switching from sTTI to 1ms TTI.

Disclosure of Invention

Based on the problems, the invention provides a new technical scheme, which can effectively reduce the time delay of HARQ feedback and improve the spectrum efficiency.

In view of this, according to a first aspect of the present invention, a HARQ feedback method is provided, which is applied to a network side device, and the HARQ feedback method includes: when data is transmitted by adopting an sTTI, transmitting downlink data to a terminal on a downlink subframe sTTI n, wherein the processing time delay of the terminal aiming at the HARQ ACK/NACK feedback of the downlink data is k sTTI; and when the data transmission by adopting the sTTI is switched to the data transmission by adopting the TTI, and the terminal cannot complete the HARQ ACK/NACK feedback of the downlink data on an uplink subframe sTTI n + k, configuring the terminal to perform the HARQ ACK/NACK feedback on the downlink data on the first TTI subframe meeting the processing delay.

In the technical scheme, when data interaction is carried out with a terminal and data is transmitted by adopting short-time sTTI, downlink data is sent to the terminal in a downlink subframe sTTI n, and the terminal needs to complete HARQ ACK/NACK feedback (namely ACK feedback or NACK feedback) on the downlink data in an uplink subframe sTTI n + k, but when the data is transmitted by adopting sTTI, no corresponding uplink subframe sTTI n + k is used as HARQ ACK/NACK feedback resources of the downlink data, so that in order to ensure that the terminal can smoothly complete HARQ ACK/NACK feedback on the downlink data and effectively reduce HARQ feedback time delay, the terminal can be configured to carry out HARQ ACK/NACK feedback on the downlink data in a first TTI subframe which meets the HARQ feedback processing time delay when the data is transmitted by adopting sTTI after being switched to adopt TTI for transmitting the data, wherein the processing delay is k sTTI.

In the above technical solution, preferably, a value range of k in the processing delay is: k is not less than 4 and not more than 8, and k is an integer.

In the technical scheme, when data interaction is performed between the network side equipment and the terminal and data is transmitted by using an short-duration sTTI, a value range of k in a processing delay of HARQ ACK/NACK feedback of downlink data sent by the network side equipment by the terminal is preferably an integer greater than or equal to 4 and less than or equal to 8, and a specific value is related to a duration of one subframe sTTI.

In any of the above technical solutions, preferably, the downlink subframe sTTI n includes 2 OFDM symbols or 3 OFDM symbols.

In the technical scheme, when data is transmitted by adopting short-duration sTTI, one subframe sTTI can comprise 2 OFDM symbols or 3 OFDM symbols, and when the data is transmitted by adopting sTTI and the terminal cannot complete HARQ ACK/NACK feedback of downlink data transmitted by network equipment on a downlink subframe sTTI n + k on an uplink subframe sTTI n + k, HARQ ACK/NACK feedback can be performed on a first TTI subframe meeting processing delay when the data is transmitted by adopting sTTI, so that the overhead of control signaling is reduced, and the spectral efficiency is improved.

According to a second aspect of the present invention, a HARQ feedback apparatus is provided, which is suitable for a network side device, and includes: a sending module, configured to send downlink data to a terminal on a downlink subframe sTTI n when data is transmitted by using sTTI, where a processing delay of HARQ ACK/NACK feedback for the downlink data by the terminal is k sTTI; and the configuration module is used for configuring the terminal to perform HARQ ACK/NACK feedback on the downlink data on the first TTI subframe meeting the processing delay when the data transmission by adopting the sTTI is switched to the data transmission by adopting the TTI and the terminal cannot complete the HARQ ACK/NACK feedback on the downlink data on the uplink subframe sTTI n + k.

In the above technical solution, preferably, a value range of k in the processing delay is: k is not less than 4 and not more than 8, and k is an integer; the downlink subframe sTTI n comprises 2 OFDM symbols or 3 OFDM symbols.

In the technical scheme, the value range of k in the processing delay when the data is transmitted by adopting the sTTI is preferably an integer which is more than or equal to 4 and less than or equal to 8, and the specific value is related to the time length of one subframe sTTI; further, when data is transmitted by adopting an sTTI with a short duration, one subframe sTTI may include 2 OFDM symbols or 3 OFDM symbols, and when data is transmitted by adopting the sTTI and the terminal cannot complete HARQ ACK/NACK feedback for downlink data sent by the network device on the downlink subframe sTTI n + k on the uplink subframe sTTI n + k, HARQ ACK/NACK feedback may be performed on a first TTI subframe that satisfies processing delay when data is transmitted by adopting the sTTI, so as to reduce overhead of control signaling and improve spectrum efficiency.

According to a third aspect of the present invention, a network side device is provided, including: as for the HARQ feedback apparatus according to any of the foregoing technical solutions of the second aspect, therefore, the network side device has all the beneficial effects of the HARQ feedback apparatus according to any of the foregoing technical solutions, and details are not repeated here.

According to a fourth aspect of the present invention, a HARQ feedback method is provided, which is applicable to a terminal, and the HARQ feedback method includes: when data is transmitted by adopting the sTTI, receiving downlink data transmitted by the network side equipment in a downlink subframe sTTI n; when HARQ ACK/NACK feedback is carried out on the downlink data on an uplink subframe sTTI n + k according to the preset processing time delay and the data is switched from the data transmission by adopting the sTTI to the data transmission by adopting the TTI, HARQ ACK/NACK feedback is carried out on the downlink data on the first TTI subframe meeting the preset processing time delay, wherein the preset processing time delay is k sTTI.

In the technical scheme, when data interaction is carried out with network side equipment and data is transmitted by adopting short-time sTTI, downlink data sent by the network side equipment on a downlink subframe sTTI n is received, HARQ ACK/NACK feedback (namely ACK feedback or NACK feedback) on the downlink data needs to be completed on an uplink subframe sTTI n + k, but when the data is transmitted by adopting sTTI, the situation that the corresponding uplink subframe sTTI n + k is not used as HARQ ACK/NACK feedback resources of the downlink data exists, so that in order to ensure that the HARQ ACK/NACK feedback on the downlink data can be successfully completed and effectively reduce the HARQ feedback time delay, HARQ ACK/NACK feedback can be carried out on the downlink data on a first TTI subframe which meets the HARQ feedback processing time delay when the data is transmitted by adopting sTTI after the data is switched to adopt TTI, wherein the processing delay is k sTTI.

In the above technical solution, preferably, a value range of k in the preset processing delay is: k is not less than 4 and not more than 8, and k is an integer; the downlink subframe sTTI n comprises 2 OFDM symbols or 3 OFDM symbols.

According to a fifth aspect of the present invention, a terminal is provided, which includes: the transceiver is used for receiving downlink data sent by the network side equipment in a downlink subframe sTTI n when data is transmitted by adopting sTTI; a processor and a memory, the processor being configured to implement the following when executing a computer program stored in the memory: when HARQ ACK/NACK feedback is carried out on the downlink data on an uplink subframe sTTI n + k according to the preset processing time delay and the data is switched from the data transmission by adopting the sTTI to the data transmission by adopting the TTI, HARQ ACK/NACK feedback is carried out on the downlink data on the first TTI subframe meeting the preset processing time delay, wherein the preset processing time delay is k sTTI.

According to the technical scheme of the invention, when the data transmission is switched from the sTTI transmission to the TTI transmission, the HARQ process feedback of the uncompleted sTTI when the data transmission is carried out by adopting the sTTI can be on the first TTI subframe meeting the processing delay when the data transmission is carried out by adopting the sTTI, so that the time delay of the HARQ feedback can be effectively reduced, and the spectrum efficiency is improved.

Drawings

Fig. 1 shows a timing example diagram of HARQ feedback;

fig. 2 is a flowchart illustrating an HARQ feedback method applied to a network side device according to an embodiment of the present invention;

fig. 3 shows a schematic block diagram of a HARQ feedback apparatus of a network side device according to an embodiment of the present invention;

FIG. 4 shows a schematic block diagram of a network side device of an embodiment of the invention;

fig. 5 is a flowchart illustrating an HARQ feedback method applied to a terminal according to an embodiment of the present invention;

fig. 6 shows a schematic block diagram of a terminal of an embodiment of the present invention.

Detailed Description

So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

Fig. 2 shows a flowchart of an HARQ feedback method applied to a network side device according to an embodiment of the present invention.

As shown in fig. 2, the HARQ feedback method applied to the network side device according to the embodiment of the present invention specifically includes the following steps:

step 202, when data is transmitted by adopting an sTTI, downlink data is sent to a terminal on a downlink subframe sTTI n, wherein the processing delay of the terminal for HARQ ACK/NACK feedback of the downlink data is k sTTI.

And 204, when the data transmission by the sTTI is switched to the data transmission by the TTI and the terminal cannot complete the HARQ ACK/NACK feedback of the downlink data on the uplink subframe sTTI n + k, configuring the terminal to perform the HARQ ACK/NACK feedback on the downlink data on the first TTI subframe meeting the processing delay.

It can be understood that, when data interaction is performed with a terminal and data is transmitted by using short-duration sTTI, downlink data is sent to the terminal in downlink subframe sTTI n, and the terminal needs to complete HARQ ACK/NACK feedback (i.e. ACK feedback or NACK feedback) for the downlink data in uplink subframe sTTI n + k, but when the data is transmitted by using sTTI is switched to using TTI, there is no corresponding uplink subframe sTTI n + k as HARQ ACK/NACK feedback resource for the downlink data, so as to ensure that the terminal can smoothly complete HARQ ACK/NACK feedback for the downlink data, thereby effectively reducing HARQ feedback delay, the terminal can be configured to perform HARQ ACK/NACK feedback for the downlink data in the first TTI subframe which satisfies HARQ feedback processing delay when data is transmitted by using sTTI after being switched to using TTI, wherein the processing delay is k sTTI.

Further, in the above embodiment, the value range of k in the processing delay is: k is not less than 4 and not more than 8, and k is an integer.

It can be understood that, when data interaction is performed between the network side device and the terminal and data is transmitted by using an sTTI with a short duration, a value range of k in a processing delay of HARQ ACK/NACK feedback for downlink data sent by the network side device by the terminal is preferably an integer greater than or equal to 4 and less than or equal to 8, and a specific value is related to a duration of one subframe sTTI.

Further, in the above embodiment, the downlink subframe sTTI n includes 2 OFDM symbols or 3 OFDM symbols.

It can be understood that, when data is transmitted by using an sTTI with a shorter duration, one subframe sTTI may include 2 OFDM symbols or 3 OFDM symbols, and when data is transmitted by using the sTTI and a terminal cannot complete HARQ ACK/NACK feedback for downlink data sent by a network device on a downlink subframe sTTI n + k on an uplink subframe sTTI n + k, HARQ ACK/NACK feedback may be performed on a first TTI subframe that satisfies a processing delay when data is transmitted by using the sTTI, so as to reduce overhead of a control signaling and improve spectrum efficiency.

Further, in the above embodiment, the network side device may include a base station and/or a base station control device.

Fig. 3 shows a schematic block diagram of an HARQ feedback apparatus of a network side device according to an embodiment of the present invention.

As shown in fig. 3, the HARQ feedback apparatus 30 of the network side device according to the embodiment of the present invention includes: the device comprises a sending module and a configuration module.

The sending module is configured to send downlink data to a terminal on a downlink subframe sTTI n when data is transmitted by using sTTI, where a processing delay of HARQ ACK/NACK feedback for the downlink data by the terminal is k sTTI; the configuration module is configured to configure the terminal to perform HARQ ACK/NACK feedback on the downlink data on a first TTI subframe that satisfies the processing delay when the TTI transmission data is switched to the TTI transmission data, and the terminal cannot complete HARQ ACK/NACK feedback on the downlink data on an uplink subframe sTTI n + k.

Further, in the above embodiment, the value range of k in the processing delay is: k is not less than 4 and not more than 8, and k is an integer; the downlink subframe sTTI n comprises 2 OFDM symbols or 3 OFDM symbols.

It can be understood that the value range of k in the processing delay when data is transmitted by using the sTTI is preferably an integer greater than or equal to 4 and less than or equal to 8, and the specific value is related to the duration of one subframe sTTI; further, when data is transmitted by adopting an sTTI with a short duration, one subframe sTTI may include 2 OFDM symbols or 3 OFDM symbols, and when data is transmitted by adopting the sTTI and the terminal cannot complete HARQ ACK/NACK feedback for downlink data sent by the network device on the downlink subframe sTTI n + k on the uplink subframe sTTI n + k, HARQ ACK/NACK feedback may be performed on a first TTI subframe that satisfies processing delay when data is transmitted by adopting the sTTI, so as to reduce overhead of control signaling and improve spectrum efficiency.

Fig. 4 shows a schematic block diagram of a network side device of an embodiment of the invention.

As shown in fig. 4, the network side device 40 according to the embodiment of the present invention includes the HARQ feedback apparatus 30 according to any one of the embodiments of the second aspect, so that the network side device 40 has all the beneficial effects of the HARQ feedback apparatus 30 according to any one of the embodiments, and details are not repeated herein. The network-side device 40 may include a base station and/or a base station control device.

Fig. 5 is a flowchart illustrating an HARQ feedback method applied to a terminal according to an embodiment of the present invention.

As shown in fig. 5, the HARQ feedback method applied to a terminal according to the embodiment of the present invention specifically includes the following steps:

step 502, when data is transmitted by using sTTI, receiving downlink data sent by the network side device in a downlink subframe sTTI n.

And step 504, when HARQ ACK/NACK feedback is carried out on the downlink data on an uplink subframe sTTI n + k according to the preset processing delay, and the data transmission is switched from the sTTI transmission to the TTI transmission, HARQ ACK/NACK feedback is carried out on the downlink data on the first TTI subframe meeting the preset processing delay, wherein the preset processing delay is k sTTI.

It can be understood that, when data interaction is performed with a network side device and data is transmitted by using an sTTI with a shorter duration, downlink data transmitted by the network side device on a downlink subframe sTTI n is received, and HARQ ACK/NACK feedback (i.e. ACK feedback or NACK feedback) for the downlink data needs to be completed on an uplink subframe sTTI n + k, but when the data is transmitted by using the sTTI and is switched to using the TTI for transmitting the data, there is a case that there is no corresponding uplink subframe sTTI n + k as HARQ ACK/NACK feedback resource for the downlink data, so as to ensure that HARQ ACK/NACK feedback for the downlink data can be successfully completed, so as to effectively reduce HARQ feedback delay, specifically, HARQ ACK/NACK feedback can be performed on the downlink data on a first TTI subframe which satisfies HARQ feedback processing delay when the data is transmitted by using the TTI after the data is switched to using the TTI for transmitting the data, wherein the processing delay is k sTTI.

Further, in the above embodiment, the value range of k in the preset processing delay is: k is not less than 4 and not more than 8, and k is an integer; the downlink subframe sTTI n comprises 2 OFDM symbols or 3 OFDM symbols.

As shown in fig. 6, the terminal 60 according to an embodiment of the present invention includes: a transceiver, a processor, and a memory.

The transceiver is used for receiving downlink data sent by network side equipment in a downlink subframe sTTIn when data are transmitted by adopting sTTI; the processor is configured to implement the following operations when executing the computer program stored in the memory: when HARQ ACK/NACK feedback is carried out on the downlink data on an uplink subframe sTTI n + k according to the preset processing time delay and the data is switched from the data transmission by adopting the sTTI to the data transmission by adopting the TTI, HARQ ACK/NACK feedback is carried out on the downlink data on the first TTI subframe meeting the preset processing time delay, wherein the preset processing time delay is k sTTI.

The HARQ feedback scheme described in any of the above embodiments of the present invention is described below with reference to a specific embodiment.

In this embodiment, referring to fig. 1, an example that one sTTI subframe includes 2 OFDM symbols and k in the processing delay is 6 is described, so that one TTI subframe with a duration of 1ms is equivalent to a duration of 7 sTTI subframes. As shown in fig. 1, in order to meet the processing delay requirement of k being 6, that is, 12 OFDM symbol durations, for data transmitted on a subframe sTTI 2, harq ack/NACK feedback occurs on a first TTI subframe, that is, a subframe TTI 8, after data is switched from data transmission using sTTI to data transmission using TTI; and the data transmitted on the subframe sTTI 3, whose HARQ ACK/NACK feedback should occur after 12 OFDM symbol durations, corresponds to the 3rd OFDM symbol of the subframe TTI 8, and considering that if the feedback cannot be performed on the 1 st OFDM symbol of the subframe TTI 8, the feedback is carried forward to the next TTI subframe, the HARQ ACK/NACK feedback should be performed on the subframe TTI 9 for the data transmitted on the subframe sTTI 3. Similarly, for data transmitted in sub-frame sTTI 4 to sub-frame sTTI 7, HARQ ACK/NACK feedback occurs in sub-frame TTI 9.

Further, any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.

The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable storage medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

The technical scheme of the present invention is described in detail above with reference to the accompanying drawings, when data transmission is switched from an sTTI to a TTI, HARQ process feedback of an incomplete sTTI when data transmission is performed using the sTTI can be provided on a first TTI subframe that satisfies processing delay when data transmission is performed using the sTTI, so that delay of HARQ feedback can be effectively reduced, and spectrum efficiency can be improved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A HARQ feedback method is suitable for network side equipment, and is characterized by comprising the following steps:

when data is transmitted by adopting an sTTI, transmitting downlink data to a terminal on a downlink subframe sTTI n, wherein the processing time delay of the terminal aiming at the HARQ ACK/NACK feedback of the downlink data is k sTTI;

when data transmission by adopting sTTI is switched to data transmission by adopting TTI, and the terminal cannot complete HARQ ACK/NACK feedback on the downlink data on an uplink subframe sTTI n + k, configuring the terminal to perform HARQ ACK/NACK feedback on the downlink data on a first TTI subframe meeting the processing delay;

the downlink subframe sTTI n comprises 2 OFDM symbols or 3 OFDM symbols.

2. The HARQ feedback method according to claim 1, wherein a value range of k in the processing delay is: k is not less than 4 and not more than 8, and k is an integer.

3. A HARQ feedback method is applicable to a terminal, and is characterized in that the HARQ feedback method comprises the following steps:

when data is transmitted by adopting the sTTI, receiving downlink data transmitted by the network side equipment in a downlink subframe sTTI n;

when HARQ ACK/NACK feedback is carried out on the downlink data on an uplink subframe sTTI n + k according to preset processing delay, and the data is switched from transmission by adopting sTTI to transmission by adopting TTI, HARQ ACK/NACK feedback is carried out on the downlink data on a first TTI subframe meeting the preset processing delay, wherein the preset processing delay is k sTTI, and the downlink subframe sTTI n comprises 2 OFDM symbols or 3 OFDM symbols.

4. The HARQ feedback method according to claim 3,

the value range of k in the preset processing delay is as follows: k is not less than 4 and not more than 8, and k is an integer.

5. An HARQ feedback apparatus, adapted to a network side device, wherein the HARQ feedback apparatus includes:

a sending module, configured to send downlink data to a terminal on a downlink subframe sTTI n when data is transmitted by using sTTI, where a processing delay of HARQ ACK/NACK feedback for the downlink data by the terminal is k sTTI;

and the configuration module is used for configuring the terminal to perform HARQ ACK/NACK feedback on the downlink data on the first TTI subframe meeting the processing delay when the data transmission by adopting the sTTI is switched to the data transmission by adopting the TTI and the terminal cannot complete the HARQ ACK/NACK feedback on the downlink data on the uplink subframe sTTI n + k, wherein the downlink subframe sTTI n comprises 2 OFDM symbols or 3 OFDM symbols.

6. The HARQ feedback apparatus of claim 5,

the value range of k in the processing delay is as follows: k is not less than 4 and not more than 8, and k is an integer.

7. A network-side device, comprising: the HARQ feedback apparatus of claim 5 or 6.

8. A terminal, characterized in that the terminal comprises:

the transceiver is used for receiving downlink data sent by the network side equipment in a downlink subframe sTTI n when data is transmitted by adopting sTTI;

a processor and a memory, the processor being configured to implement the following when executing a computer program stored in the memory: when HARQ ACK/NACK feedback is carried out on the downlink data on an uplink subframe sTTI n + k according to preset processing delay, and the data is switched from transmission by adopting sTTI to transmission by adopting TTI, HARQ ACK/NACK feedback is carried out on the downlink data on a first TTI subframe meeting the preset processing delay, wherein the preset processing delay is k sTTI, and the downlink subframe sTTI n comprises 2 OFDM symbols or 3 OFDM symbols.

9. The terminal of claim 8,