CN108737036A

CN108737036A - Feedback information method of reseptance, sending method, apparatus and system

Info

Publication number: CN108737036A
Application number: CN201710807400.7A
Authority: CN
Inventors: 郑娟; 官磊; 李�远
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-04-18
Filing date: 2017-09-08
Publication date: 2018-11-02
Anticipated expiration: 2037-09-08
Also published as: CN108737036B

Abstract

This application discloses a kind of feedback information method of reseptance, sending method, apparatus and systems, belong to the communications field.This method includes：Terminal receives feedback information on first time unit, which includes the first feedback information and the second feedback information sent by same down channel；Terminal sends upstream data on the second time quantum according to the first feedback information by the first HARQ processes, and the second feedback information is the reception state of n the 2nd HARQ processes, and the 2nd HARQ processes are the HARQ processes of terminal.The present invention solves the problems, such as that HARQ feedback mechanism is not suitable as the feedback mechanism that UL grant free are transmitted in current LTE system；So that after terminal receives feedback information, the corresponding reception state of other upstream datas can have not only been known, but also can know the resource for retransmitting the first upstream data or just passing needed for the second upstream data.

Description

Feedback information receiving method, sending method, device and system

The present application claims priority of chinese patent application entitled "feedback information receiving method, sending method, apparatus and system" filed by chinese patent office with application number 201710254780.6 on 18/4/2017, the entire contents of which are incorporated herein by reference.

Technical Field

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

Background

In a Hybrid automatic Repeat Request (HARQ) mechanism, feedback information refers to information that is fed back to a terminal after an access network device receives uplink data sent by the terminal. The feedback information is used for indicating whether the access network equipment correctly receives the uplink data sent by the terminal. The feedback information generally includes Acknowledgement (ACK) and Non-Acknowledgement (NACK). The ACK is used to indicate that the access network has correctly received the uplink data sent by the terminal, and the NACK is used to indicate that the access network device has not correctly received the uplink data sent by the terminal. The feedback information may include Discontinuous Transmission (DTX), and when the terminal transmits uplink data but the access network device does not receive the uplink data, the feedback may be performed using DTX.

In a Long Term Evolution (LTE) system, a process of sending uplink data from a terminal to the terminal receiving feedback information may include the following steps: a terminal sends a Scheduling Request (SR) to access network equipment; the access network equipment sends a first uplink scheduling grant (UL grant) to the terminal according to the SR; the terminal receives the first UL grant and transmits uplink data to the access network equipment according to the control information in the first UL grant; after receiving uplink data sent by a terminal, an access network device feeds back an ACK to the terminal through a Physical Hybrid-automatic repeat request Channel (PHICH), and the terminal preliminarily confirms that the access network device has correctly received the uplink data (the ACK may occupy one bit and has a possibility of identification error); and when the terminal has data to be sent, the access network equipment continues to send a second UL grant to the terminal, and when the second UL grant is used for indicating new data transmission, the terminal determines that the access network equipment has correctly received the uplink data again according to the received ACK and the second UL grant, and continues to send other uplink data to the access network equipment according to the second UL grant.

Since the entire Transmission process of uplink data is long in the LTE system, if the statistics is performed according to the Transmission Time Interval (TTI), the Transmission delay of 12 × TTI +0.5 × TTI is usually required, where N × TTI is the Transmission period of SR. However, in the 5th generation mobile communication technology (5G) system, the Ultra-reliable Low latency communication (URLLC) terminal has a high latency requirement, and the transmission latency of the Uplink data in LTE cannot meet the latency requirement of the URLLC terminal, so the URLLC terminal in the 5G system can transmit the Uplink data to the access network device by Uplink grant free (UL grant free) transmission. The UL grant free transmission means that the terminal does not need to wait for uplink transmission resources allocated by the access network device through the UL grant, and the terminal can send uplink data by selecting the uplink transmission resources from preset resources, so that the transmission delay of the uplink data is greatly reduced. In UL grant free transmission, the access network device does not need to send UL grant to the terminal in most cases, for example, for initial transmission data, so the HARQ feedback mechanism in the current LTE system is not suitable as the feedback mechanism for UL grant free transmission.

Disclosure of Invention

In order to solve the problem that the HARQ feedback mechanism in the current LTE system is not suitable as the feedback mechanism for UL grant free transmission, embodiments of the present application provide a method, a device, and a system for receiving feedback information.

In a first aspect, a method for receiving feedback information is provided, where the method includes: the terminal receives feedback information on a first time unit, wherein the feedback information comprises first feedback information and second feedback information which are sent through the same downlink channel; and the terminal sends uplink data through the first HARQ process on the second time unit according to the first feedback information. The second feedback information is the receiving state of n second HARQ processes, the second HARQ processes are HARQ processes of the terminal, n is a positive integer, and the second time unit is located after the first time unit.

The first feedback information and the second feedback information are jointly sent to the terminal through the access network equipment, so that after the terminal receives the feedback information, the terminal can acquire the receiving state corresponding to other uplink data and can acquire resources required by retransmission of the first uplink data or initial transmission of the second uplink data; the first feedback information and the second feedback information are not required to be respectively sent to the terminal by the access network equipment, so that the terminal only needs to perform blind detection once when receiving the feedback information, the first feedback information and the second feedback information do not need to be respectively subjected to blind detection, and the number of times of blind detection of the terminal is reduced. Meanwhile, since the second feedback information includes the reception states of the n second HARQ processes, even if the terminal device fails to detect the feedback information corresponding to the second HARQ process before receiving the feedback information including the first feedback information and the second feedback information, the feedback information corresponding to the second HARQ process can be determined by the feedback information including the first feedback information and the second feedback information, so that the robustness of the feedback information of the second HARQ process is increased, and the method is particularly suitable for a transmission service with a high requirement on transmission reliability, such as URLLC.

In a first implementation of the first aspect, before the terminal receives the feedback information over the first time unit, the method further includes: the terminal sends first uplink data through a first HARQ process on a third time unit; the third time unit precedes the first time unit.

When the access network equipment and the terminal transmit uplink data through a UL grant free, the terminal automatically selects an uplink transmission resource to transmit first uplink data through a first HARQ process, and at the moment, after receiving the first uplink data, the access network equipment enables the terminal to acquire scheduling information for initially transmitting second uplink data or retransmitting the first uplink data by sending feedback information; the access network equipment does not need to send the scheduling information such as the UL grant in advance, and the transmission scene of the UL grant free is met.

With reference to the first implementation of the first aspect, in a second implementation of the first aspect, a method for a terminal to send uplink data through a first HARQ process in a second time unit according to first feedback information includes: the terminal retransmits the first uplink data through the first HARQ process on the second time unit according to the first feedback information; or the terminal initially transmits second uplink data through the first HARQ process on a second time unit according to the first feedback information; the uplink data sent by the first HARQ process includes first uplink data and/or second uplink data.

The first feedback information can be used for the terminal to retransmit the first uplink data and can also be used for the terminal to initially transmit the second uplink data; the access network equipment does not need to send the UL grant in advance before the terminal sends the first uplink data, and the transmission scene of the UL grant free is met.

With reference to the first implementation or the second implementation of the first aspect, in a third implementation of the first aspect, the reception status includes an acknowledgement reception status ACK and a non-acknowledgement reception status NACK; the second feedback information is also used for indicating the receiving state corresponding to the first HARQ process; when the receiving state corresponding to the first HARQ process is the receiving confirmation state, the first feedback information is used for initially transmitting second uplink data on a second time unit by the scheduling terminal through the first HARQ process; and when the receiving state corresponding to the first HARQ process is a non-confirmed receiving state, the first feedback information is used for the scheduling terminal to retransmit the first uplink data on the second time unit through the first HARQ process.

The second feedback information carries the receiving state corresponding to the first HARQ process, so that the terminal can determine whether the first feedback information is used for scheduling to retransmit first uplink data through the first HARQ process or is used for scheduling to initially transmit second uplink data through the first HARQ process according to the receiving state in the second feedback information; and the second feedback information does not need to carry the retransmission or initial transmission indication, thereby reducing the information length of the second feedback information.

With reference to the first aspect or any one implementation of the first to third implementations of the first aspect, in a fourth implementation of the first aspect, the first feedback information is further used to schedule the terminal to send uplink data through m second HARQ processes of the n second HARQ processes, where m is greater than or equal to 1 and less than or equal to n, and m is an integer.

The uplink data is sent by scheduling m second HARQ processes in the n second HARQ processes, so that the access network equipment can dynamically configure uplink transmission resources corresponding to the m second HARQ processes according to factors such as current load, channel conditions, network conditions and the like, and the success rate of the terminal for transmitting other uplink data through the second HARQ processes is improved. And simultaneously, the m second HARQ processes are scheduled to send uplink data through the first feedback information, so that the control signaling overhead for scheduling the uplink data can be reduced.

With reference to the fourth implementation of the first aspect, in a fifth implementation of the first aspect, the first feedback information is used to schedule the terminal to retransmit other corresponding uplink data through s second HARQ processes; and/or the first feedback information is used for scheduling other uplink data which are initially transmitted by the terminal through m-s second HARQ processes; wherein s is an integer not less than zero, and s is not more than m.

With reference to the fourth implementation of the first aspect, in a fifth implementation of the first aspect, the method further includes: the terminal receives configuration information, and the configuration information is used for indicating the terminal to receive the first feedback information and the second feedback information on a downlink channel.

The access network equipment can send the first feedback information and the second feedback information at the same time by dynamically configuring the mode that the terminal receives the first feedback information and the second feedback information by the access network equipment; and the first feedback information and the second feedback information can be respectively and independently sent, so that the flexibility of sending the feedback information by the access network equipment is improved.

With reference to the first aspect or any one of the first to fourth implementations of the first aspect, in a fifth implementation of the first aspect, the second feedback information is represented in the form of a bitmap.

Because the bitmap includes the preset number of bits, each bit is used for indicating the receiving state corresponding to the corresponding uplink HARQ process, the second feedback information does not need to carry the process number of each uplink HARQ process, and the terminal can know the corresponding relationship between the receiving state in the second feedback information and the uplink HARQ process, thereby reducing the information length of the second feedback information. Meanwhile, the access network equipment and the terminal can have consistent understanding on the receiving state of the uplink data through a bitmap indicating mode, and the receiving state of feedback caused by the fact that the access network equipment misses the uplink data sent by the terminal cannot be influenced.

Optionally, the second feedback information further includes time indication information, where the time indication information is used to indicate time units corresponding to the reception states of the n second HARQ processes.

By carrying the time indication information in the second feedback information, the terminal can determine the corresponding relationship between the receiving state and the HARQ process according to the corresponding relationship between the time indication information and the receiving state, thereby ensuring the accuracy of determining the receiving state corresponding to each HARQ process by the terminal.

Optionally, the time indication information indicates a time range including time units corresponding to the reception states of the n second HARQ processes.

Optionally, the time indication information includes a time start point and a time end point of the time range; or, the time indication information includes a time start point and a time length of the time range; or, the time indication information includes a time end and a time length of the time range; or, the time indication information includes a time length of a time range, a time start point or a time end point of the time range being preconfigured; alternatively, the time indication information comprises a time start or a time end of a time range, the time length of the time range being preconfigured.

Optionally, the starting point in time is the earliest time unit in the time domain among the n time units; and/or the time end point is the time unit which is latest in the time domain from the n time units; and/or the time length is a time duration between an earliest time unit in the time domain to a latest time unit in the time domain among the n time units.

By setting the time starting point as the earliest time unit in the time domain among the n time units and/or setting the time ending point as the latest time unit in the time domain among the n time units, the redundant time unit indicated by the time indication information is avoided, and the signaling overhead of the access network equipment is saved.

Optionally, the time length is associated with a number of bits corresponding to the reception states of the n second HARQ processes.

By associating the time length with the bit number corresponding to the receiving state of the n second HARQ processes, the access network device does not need to indicate the time length of the time range by additional signaling, and the signaling overhead of the access network device is saved.

Optionally, the time range includes a sub-time range, a time start point of the sub-time range is a time unit corresponding to a second HARQ process satisfying a preset condition among the n second HARQ processes, a time end point of the sub-time range is the first time unit or a time unit before the first time unit,

the time length of the sub-time range is less than or equal to the retransmission waiting time length, the retransmission waiting time length comprises the timing time length of an automatic retransmission timer, the automatic retransmission timer is used for triggering the terminal to retransmit uplink data sent by the HARQ process meeting the preset condition, and the starting time of the automatic retransmission timer is positioned behind the time unit corresponding to the HARQ process meeting the preset condition.

By setting the time length of the sub-time range to be less than or equal to the retransmission waiting time length, the receiving state of the uplink data is received before the terminal automatically retransmits the uplink data, and the validity of the receiving state fed back by the access network equipment is ensured.

Optionally, the retransmission waiting duration further includes a feedback delay, where the feedback delay is a duration of an interval between a time when the terminal sends uplink data through the second HARQ process meeting the preset condition and a time when the terminal receives the receiving state of the second HARQ process meeting the preset condition.

Optionally, the preset condition is at least one of the following conditions:

the second HARQ process of which the corresponding time unit is the earliest time unit in the time domain in the n time units;

the second HARQ process with the shortest timing duration of the corresponding automatic retransmission timer;

a second HARQ process with the timing duration of the corresponding automatic retransmission timer being greater than the preset length;

and the HARQ process for retransmitting the uplink data earliest in the time domain.

Optionally, n is greater than or equal to 2.

In a second aspect, a feedback information receiving method is provided, and the method includes: a terminal sends uplink data through n hybrid automatic repeat request (HARQ) processes in n time units, wherein n is a positive integer; the terminal receives feedback information on a first time unit, the feedback information comprises the receiving states of the n HARQ processes and time indication information, the time indication information is used for indicating time units corresponding to the receiving states of the n HARQ processes, and the n time units are located before the first time unit.

Optionally, the time indication information indicates a time range corresponding to n time units.

Optionally, the time length is associated with a number of bits corresponding to the reception states of the n HARQ processes.

Optionally, the time range includes a sub-time range, a time start point of the sub-time range is a time unit corresponding to a HARQ process meeting a preset condition among the n HARQ processes, a time end point of the sub-time range is a first time unit or a time unit before the first time unit,

Optionally, the retransmission waiting duration further includes a feedback delay, where the feedback delay is a duration of an interval between a time when the terminal transmits uplink data through the HARQ process meeting the preset condition and a time when the terminal receives the reception state of the HARQ process meeting the preset condition.

Optionally, the preset condition is at least one of the following conditions: the corresponding time unit is the HARQ process of the earliest time unit in the time domain in the n time units; the HARQ process with the shortest timing duration of the corresponding automatic retransmission timer; the timing duration of the corresponding automatic retransmission timer is greater than the HARQ process with the preset length; and the HARQ process for retransmitting the uplink data earliest in the time domain.

Optionally, n is greater than or equal to 2.

Optionally, the feedback information includes first feedback information and second feedback information, where the first feedback information is used to instruct the terminal to send uplink data through the first HARQ process in the second time unit, and the second feedback information includes the reception states of the n HARQ processes and time indication information.

The technical effect obtained by the second aspect of the embodiment of the present invention is similar to the technical effect obtained by the corresponding technical means in the first aspect, and is not described herein again.

In a third aspect, a feedback information receiving method is provided, where the method includes: a terminal sends uplink data through n hybrid automatic repeat request (HARQ) processes in n time units, wherein n is a positive integer; the terminal receives feedback information on a first time unit, the feedback information comprises receiving states of n HARQ processes, the time length between a time unit corresponding to the HARQ process meeting preset conditions in the n HARQ processes and the first time unit is smaller than or equal to retransmission waiting time, the retransmission waiting time comprises the timing time of an automatic retransmission timer, and the automatic retransmission timer is used for triggering the terminal to retransmit uplink data sent by the HARQ process meeting the preset conditions.

The technical effect obtained by the third aspect of the embodiment of the present invention is similar to the technical effect obtained by the corresponding technical means in the second aspect, and is not described herein again.

In a fourth aspect, a feedback information receiving method is provided, which includes: the access network equipment sends feedback information on a first time unit, the feedback information comprises first feedback information and second feedback information through the same downlink channel, and the first feedback information is used for scheduling a terminal to send uplink data through a first HARQ process; the second feedback information is the receiving state of n second HARQ processes, the second HARQ processes are the HARQ processes of the terminal, and n is a positive integer; the access network equipment receives uplink data sent by the terminal through the first HARQ process in a second time unit; the second time unit is located after the first time unit.

With reference to the fourth aspect, in a first implementation of the fourth aspect, before the access network device sends the feedback information on the first time unit, the method further includes: the access network equipment receives first uplink data sent by the terminal through a first HARQ process in a third time unit; the third time unit precedes the first time unit.

With reference to the first implementation of the fourth aspect, in a second implementation of the fourth aspect, the receiving, by an access network device, uplink data sent by a terminal through a first HARQ process in a second time unit includes: the access network equipment retransmits the first uplink data through the first HARQ process on a second time unit by the receiving terminal; or, the access network device receives the first uplink data initially transmitted by the terminal through the first HARQ process in the second time unit; the uplink data sent by the first HARQ process includes first uplink data and/or second uplink data.

With reference to the first implementation or the second implementation of the fourth aspect, in a third implementation of the fourth aspect, the reception status includes an acknowledgement reception status ACK and a non-acknowledgement reception status NACK; the second feedback information is also used for indicating the receiving state corresponding to the first HARQ process; when the receiving state corresponding to the first HARQ process is the receiving confirmation state, the first feedback information is used for initially transmitting second uplink data on a second time unit by the scheduling terminal through the first HARQ process; and when the receiving state corresponding to the first HARQ process is a non-confirmed receiving state, the first feedback information is used for the scheduling terminal to retransmit the first uplink data on the second time unit through the first HARQ process.

With reference to the fourth aspect, or any one of the first implementation to the third implementation of the fourth aspect, in the fourth implementation of the fourth aspect, the first feedback information is further used to schedule the terminal to send the second uplink data through m second HARQ processes of the n second HARQ processes, where m is greater than or equal to 1 and less than or equal to n, and m is an integer.

With reference to the fourth implementation of the fourth aspect, in a fifth implementation of the fourth aspect, the first feedback information is used to schedule the terminal to retransmit other corresponding uplink data through s second HARQ processes; and/or the first feedback information is used for scheduling other uplink data which are initially transmitted by the terminal through m-s second HARQ processes; wherein s is an integer not less than zero, and s is not more than m.

With reference to the fourth aspect or any one of the first to fifth implementations of the fourth aspect, in a sixth implementation of the fourth aspect, the method further includes: and the access network equipment sends configuration information, wherein the configuration information is used for indicating the terminal to receive the first feedback information and the second feedback information on a downlink channel.

With reference to the fourth aspect or any one of the first to sixth implementations of the fourth aspect, in a seventh implementation of the fourth aspect, the second feedback information is represented in the form of a bitmap.

The technical effect obtained by the fourth aspect of the embodiment of the present invention is similar to the technical effect obtained by the corresponding technical means in the first aspect, and is not described herein again.

With reference to the first aspect, the fourth aspect, or any one of possible implementation manners, the receiving states of the n second HARQ processes include: and the terminal sends the receiving state of other uplink data through the second HARQ process, and/or the terminal does not send the default receiving state of other uplink data through the second HARQ process.

With reference to the first aspect, the fourth aspect, or any one of the possible implementation manners, a maximum value of an uplink HARQ process supported by the terminal is n + 1; or, the maximum value of the uplink HARQ processes supported by the terminal for assisting UL grant free transmission is n + 1.

With reference to the first aspect, the fourth aspect, or any one of the possible implementation manners, the first feedback information includes time domain resource configuration information and/or frequency domain resource configuration information.

With reference to the first aspect or the fourth aspect or any one of the possible implementations, a time interval between the third time unit and the first time unit, and a time interval between the second time unit and the first time are predefined, or preconfigured by the access network device, or dynamically notified by the access network device.

With reference to the first aspect, the fourth aspect, or any one of the possible implementation manners, the frequency bands in which the third time unit, the second time unit, and the first time unit are located are unlicensed frequency bands, and the third time unit and the second time unit are time units included in the uplink duration of the one-time transmission opportunity TxOP. The third time units may belong to the same TxOP or may belong to different txops.

Optionally, before the access network device sends the feedback information on the first time unit, the method further includes:

and the access network equipment receives the uplink data sent by the terminal through the n second HARQ processes on n time units, wherein the n time units are positioned before the first time unit on the time domain.

Optionally, the second feedback information is further used to indicate a receiving state corresponding to the first HARQ process, and the time indication information is further used to indicate a time unit corresponding to the receiving state of the first HARQ process.

Optionally, the time indication information includes a time start point and a time end point of the time range; or,

the time indication information comprises a time starting point and a time length of the time range; or,

the time indication information comprises a time end point and a time length of the time range; or,

the time indication information comprises a time length of a time range, a time start point or a time end point of the time range being preconfigured; or,

the time indication information comprises a time start or a time end of a time range, the time length of which is preconfigured.

Optionally, the starting point in time is the earliest time unit in the time domain among the n time units; and/or the presence of a gas in the gas,

the time end point is the time unit which is latest in the time domain from the n time units; and/or the presence of a gas in the gas,

the time length is a time length between an earliest time unit in the time domain to a latest time unit in the time domain among the n time units.

Optionally, the preset condition is at least one of the following conditions:

Optionally, n is greater than or equal to 2.

In a fifth aspect, a feedback information sending method is provided, where the method includes: the access network equipment receives uplink data sent by a terminal through n hybrid automatic repeat request (HARQ) processes on n time units, wherein n is a positive integer; the access network equipment sends feedback information on a first time unit, the feedback information comprises the receiving states of the n HARQ processes and time indication information, the time indication information is used for indicating time units corresponding to the receiving states of the n HARQ processes, and the n time units are located before the first time unit.

Optionally, the time range includes a sub-time range, a time start point of the sub-time range is a time unit corresponding to an HARQ process meeting a preset condition among the n HARQ processes, a time end point of the sub-time range is a first time unit or a time unit before the first time unit, a time length of the sub-time range is less than or equal to a retransmission waiting time length, the retransmission waiting time length includes a timing time length of an automatic retransmission timer, the automatic retransmission timer is used for triggering the terminal to retransmit uplink data sent through the HARQ process meeting the preset condition, and a start time of the automatic retransmission timer is located after the time unit corresponding to the HARQ process meeting the preset condition.

Optionally, n is greater than or equal to 2.

The technical effect obtained by the fifth aspect of the embodiment of the present invention is similar to the technical effect obtained by the corresponding technical means in the first aspect, and is not described herein again.

In a sixth aspect, a method for sending feedback information is provided, where the method includes: the access network equipment receives the uplink data sent by the terminal through n hybrid automatic repeat request (HARQ) processes on n time units, wherein n is a positive integer; the access network equipment sends feedback information on a first time unit, the feedback information comprises receiving states of n HARQ processes, the time length between a time unit corresponding to the HARQ process meeting preset conditions in the n HARQ processes and the first time unit is smaller than or equal to retransmission waiting time, the retransmission waiting time comprises the timing time of an automatic retransmission timer, and the automatic retransmission timer is used for triggering the terminal to retransmit uplink data sent by the HARQ process meeting the preset conditions.

The technical effect obtained by the fifth aspect of the embodiment of the present invention is similar to the technical effect obtained by the corresponding technical means in the third aspect, and is not described herein again.

A seventh aspect provides a feedback information receiving apparatus, where the apparatus includes at least one unit, where the at least one unit is configured to implement the feedback information receiving method provided by the first aspect or any one of the possible implementation manners of the first aspect; alternatively, the feedback information receiving method provided by the second aspect; alternatively, the feedback information receiving method provided in the third aspect is provided.

In an eighth aspect, a feedback information sending apparatus is provided, where the apparatus includes at least one unit, where the at least one unit is configured to implement the feedback information sending method provided in any one of the above fourth aspect or the fourth aspect or any one of the possible implementation manners; or, the feedback information sending method provided by the fifth aspect; alternatively, the feedback information transmitting method provided in the sixth aspect.

In a ninth aspect, there is provided a terminal comprising: the system comprises a processor, a transmitter and a receiver which are connected with the processor;

the transmitter and the receiver are configured to be controlled by a processor for implementing the feedback information receiving method provided by the first aspect or any one of the possible implementations of the first aspect; or, the feedback information receiving method provided by the second aspect; alternatively, the feedback information receiving method provided in the third aspect is provided.

In a tenth aspect, there is provided an access network device, including: the system comprises a processor, a transmitter and a receiver which are connected with the processor;

the transmitter and the receiver are configured to be controlled by a processor, the processor being configured to implement the feedback information sending method provided by any one of the above-mentioned fourth aspect or possible implementation manner of the fourth aspect; or, the feedback information sending method provided in the fifth aspect; alternatively, the feedback information transmitting method according to the sixth aspect.

An eleventh aspect provides a computer-readable storage medium, which stores instructions that, when executed on a terminal, cause the terminal to execute the feedback information receiving method provided in the first aspect or any one of the possible implementations of the first aspect; alternatively, the feedback information receiving method provided by the second aspect; alternatively, the feedback information receiving method provided in the third aspect is provided.

An eighth aspect provides a computer-readable storage medium, which stores instructions that, when executed on an access network device, cause the access network device to perform a feedback information sending method provided in any one of the above-mentioned fourth aspect or possible implementation manners of the fourth aspect; or, the feedback information sending method provided by the fifth aspect; alternatively, the feedback information transmitting method according to the sixth aspect.

A ninth aspect provides a feedback information system, which includes a terminal and an access network device, where the terminal is configured to execute the feedback information receiving method provided in the first aspect; or, the feedback information receiving method provided by the second aspect; alternatively, the feedback information receiving method provided by the third aspect; the access network device is configured to execute the feedback information sending method provided in the fourth aspect; or, the feedback information sending method provided by the fifth aspect; alternatively, the feedback information transmission method provided by the sixth aspect.

Drawings

Fig. 1 is a schematic structural diagram of a mobile communication system provided in an exemplary embodiment of the present application;

fig. 2 is a schematic structural diagram of a terminal provided in an exemplary embodiment of the present application;

fig. 3 is a schematic structural diagram of an access network device according to an exemplary embodiment of the present application;

fig. 4A is a flowchart of a feedback information transmission method according to an exemplary embodiment of the present application;

FIG. 4B is a schematic illustration of feedback information provided by an exemplary embodiment of the present application;

FIG. 4C is a schematic illustration of a time delay provided by an exemplary embodiment of the present application;

fig. 4D is a flowchart of a feedback information transmission method according to another exemplary embodiment of the present application;

FIG. 4E is a schematic diagram of a third time cell provided by an exemplary embodiment of the present application;

FIG. 4F is a diagram illustrating second feedback information provided by an exemplary embodiment of the present application;

FIG. 4G is a schematic diagram of a time cell provided by an exemplary embodiment of the present application;

FIG. 4H is a schematic diagram of a time cell provided by an exemplary embodiment of the present application;

FIG. 4I is a graphical illustration of time ranges provided by an exemplary embodiment of the present application;

fig. 4J is a schematic diagram of an automatic repeat request timer provided by an exemplary embodiment of the present application;

FIG. 4K is a schematic diagram of a relationship between time ranges and an automatic repeat request timer provided by an exemplary embodiment of the present application;

FIG. 4L is a schematic diagram of a relationship between time ranges and an automatic repeat request timer provided by an exemplary embodiment of the present application;

FIG. 4M is a schematic diagram of a relationship between time ranges and an automatic repeat request timer provided by an exemplary embodiment of the present application;

FIG. 4N is a schematic diagram of a relationship between time ranges and an automatic repeat request timer provided by an exemplary embodiment of the present application;

fig. 4O is a schematic diagram of an automatic repeat request timer provided by an exemplary embodiment of the present application;

FIG. 5 is a diagram illustrating second feedback information provided by an exemplary embodiment of the present application;

FIG. 6 is a diagram of second feedback information provided by an exemplary embodiment of the present application;

FIG. 7 is a schematic illustration of feedback information provided by an exemplary embodiment of the present application;

fig. 8 is a flowchart of a feedback information transmission method according to another exemplary embodiment of the present application;

FIG. 9A is a schematic diagram of a one-time TxOP provided in an exemplary embodiment of the present application;

fig. 9B is a flowchart of a feedback information transmission method according to an exemplary embodiment of the present application;

fig. 9C is a flowchart of a feedback information transmission method according to an exemplary embodiment of the present application;

fig. 10 is a block diagram of a feedback information transmission apparatus according to an embodiment of the present application.

Detailed Description

The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another, unless otherwise specified. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

Reference herein to a "module" generally refers to a program or instructions stored in memory that is capable of performing certain functions; reference herein to "unit" generally refers to a logically partitioned functional structure, and the "unit" may be implemented by pure hardware or a combination of hardware and software.

Reference herein to "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: 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.

Reference will first be made to a number of terms referred to herein.

1. And (3) licensed frequency band: the spectrum resources can be used after being licensed by the management department of the communication industry.

2. License-free frequency band: the method refers to that on the premise of meeting related technical requirements, spectrum resources can be directly used without permission of a management department of the communication industry, and an operator can realize the shunting of network capacity by using unlicensed frequency band transmission data.

The related technical requirements mainly include two types, the first type of requirements does not relate to a specific coexistence specification, and mainly limits transmission power, that is, the transmission power of the access network device and the transmission power of the terminal need to be limited within a preset range, so as to avoid interfering with the communication devices operating in the adjacent frequency band and the shared frequency band. The second category sets specific coexistence specifications for coexistence with other radio services such as radio positioning. The coexistence specification at least includes the specifications of Transmit Power Control (TPC), Dynamic Frequency Selection (DFS), channel occupation bandwidth, Listen Before Talk (LBT), and the like.

3. LBT: for the unlicensed frequency band, before each communication device (access network device or terminal) sends data on a certain channel, it needs to detect whether the current channel is idle, that is, it needs to detect whether other communication devices nearby occupy the channel to send data; if the channel is detected to be idle within a period of time, the communication device can transmit data on the current channel, but the communication device has a limit on the length of time for transmitting data, and within the limit, the communication device does not need to perform the process of detecting whether the current channel is idle again; if the channel is detected to be occupied, the communication device is unable to transmit data on the current channel. The process of detecting whether the current Channel is idle is also referred to as Clear Channel Assessment (CCA), and the present embodiment does not limit the specific name of the process of detecting whether the current Channel is idle.

4. Transmission Opportunity (TxOP): the time refers to a time for which the communication device continuously uses the unlicensed frequency band without re-evaluating the Channel through the CCA after competing for a use opportunity of the unlicensed frequency band through Clear Channel Assessment (CCA). The TxOP may include only time cells in the downlink duration, only time cells in the uplink duration, and both time cells in the downlink duration and time cells in the uplink duration. The time unit in the downlink duration refers to a time unit for transmitting downlink data, and the time unit in the uplink duration refers to a time unit for transmitting uplink data. The TxOP may also be referred to as a Channel Occupancy period (Channel Occupancy Time), or may also be referred to as a Maximum Channel Occupancy duration (MCOT), which is not limited in this embodiment.

5. Uplink Grant (UL Grant): the control information is sent to the terminal when the access network device allows the terminal to transmit uplink data. The UL grant includes control information for controlling an uplink transmission resource used by the terminal to transmit uplink data and a transmission scheme used.

6. No uplink scheduling grant (UL grant free) transmission: the terminal can select uplink transmission resources from a Pre-configured (Pre-configured) or predefined resource pool to directly perform uplink data transmission without an uplink scheduling grant of the access network device. Optionally, the resource pool includes a first resource pool for initially transmitting the uplink data in the UL grant free transmission process and/or a second resource pool for retransmitting the uplink data in the UL grant free transmission process. Optionally, the first resource pool and the second resource pool may be the same.

7. Licensed Assisted Access (LAA) -Long Term Evolution (LTE) system: the LTE system refers to an LTE system in which a licensed frequency band and an unlicensed frequency band are used in a combined manner by Carrier Aggregation (CA) or non-CA.

Optionally, when the usage scenario of the LAA-LTE system is a scenario in which the licensed frequency band and the unlicensed frequency band are jointly used by CA, the cell operating on the licensed frequency band is used as a primary cell, and the cell operating on the unlicensed frequency band is used as a secondary cell, where the primary cell and the secondary cell may be deployed in a co-site manner or in a non-co-site manner, and an ideal backhaul path is provided between the primary cell and the secondary cell.

Optionally, when the usage scenario of the LAA-LTE system is not a scenario in which the licensed band and the unlicensed band are jointly used by CA, for example: in a Dual Connectivity (DC) scenario, a cell operating in a licensed frequency band is used as a primary cell, a cell operating in an unlicensed frequency band is used as a secondary cell, and there is no ideal backhaul path between the primary cell and the secondary cell, for example: the backhaul delay is large.

8. A stand-alone LTE (standard LTE over Unlicensed spectrum, standard LTE ULTE) system on an Unlicensed band: refers to an independently deployed cell operating on an unlicensed frequency band. In this case, the cell operating in the unlicensed frequency band does not need to be assisted by the cell operating in the licensed frequency band, and an independent access function can be provided.

Alternatively, in the present application, carrier and cell are considered as equivalent concepts, i.e. it is equivalent that a terminal accesses one carrier and one cell.

Optionally, the cell mentioned in this application is a cell corresponding to an access network device, and the cell may belong to a macro access network device, and may also belong to an access network device corresponding to a small cell (small cell), where the small cell may include: the mobile communication system comprises urban cells (Metro cells), Micro cells (Micro cells), Pico cells (Pico cells), Femto cells (Femto cells) and the like, wherein the small cells have the characteristics of small coverage area and low transmission power, and are suitable for providing high-speed data transmission service.

Referring to fig. 1, a schematic structural diagram of a mobile communication system according to an exemplary embodiment of the present application is shown. The mobile communication system may be an LTE system; the system may also be an LAA-LTE system, a standard LTE system, or a 5G system, where the 5G system is also called a New Radio (NR) system, and this embodiment is not limited thereto. The mobile communication system includes: access network device 120 and terminal 140.

The access network device 120 may be a base station, which may be configured to convert the received radio frame and IP packet message into each other, and may coordinate attribute management of the air interface. For example, the base station may be an evolved Node B (eNB) or e-NodeB in LTE, or a base station adopting a centralized distributed architecture in a 5G system. When the access network device 120 adopts a centralized distributed architecture, it generally includes a Centralized Unit (CU) and at least two Distributed Units (DUs). A Packet Data Convergence Protocol (PDCP) layer, a Radio Link layer Control Protocol (RLC) layer, and a Media Access Control (MAC) layer are set in the central unit; the distribution unit is provided with a Physical layer (PHY) protocol stack, and the embodiment of the present invention does not limit the specific implementation manner of the access network device 120. Optionally, the access network device may further include a Home base station (Home eNB, HeNB), a Relay (Relay), a Pico base station Pico, and the like.

The access network device 120 and the terminal 140 establish a wireless connection over a wireless air interface. Optionally, the wireless air interface is a wireless air interface based on a 5G standard, for example, the wireless air interface is a New Radio (NR); or, the wireless air interface may also be a wireless air interface based on a 5G next generation mobile communication network technology standard; alternatively, the wireless air interface may be a wireless air interface based on the 4G standard (LTE system). Access network device 120 may receive uplink data sent by terminal 140 via a wireless connection.

Terminal 140 may refer to a device in data communication with access network device 120. The terminals 140 may communicate with one or more core networks via a Radio Access Network (RAN), and the terminals 140 may be mobile terminals such as mobile phones (or "cellular" phones) and computers with mobile terminals, such as portable, pocket, hand-held, computer-included, or vehicle-mounted mobile devices. For example, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (RemoteStation), an Access Point (Access Point), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Equipment (User Terminal), a User Agent (User Agent), a Terminal (User Device), or a User Terminal (UE). Optionally, the terminal 140 may also be a Relay (Relay) device, which is not limited in this embodiment. Terminal 140 may send uplink data to access network device 120 via a wireless connection with access network device 120.

Optionally, the terminal 140 sends the uplink data to the access network device 120, which may be based on UL grant free transmission, that is, the terminal 140 selects an uplink transmission resource from the resource pool to transmit the uplink data; or, based on the UL grant transmission, that is, the terminal 140 sends a Scheduling Request (SR) to the access network device, and the access network device sends the UL grant to the terminal according to the SR, or that is, the transmission resource corresponding to the uplink data transmitted by the terminal 140 is realized by the access network device through the UL grant Scheduling; the terminal transmits uplink data according to the control information in the UL grant, which is not limited in this embodiment.

It should be noted that, in the mobile communication system shown in fig. 1, a plurality of access network devices 120 and/or a plurality of terminals 140 may be included, and fig. 1 illustrates one access network device 120 and one terminal 140, but this embodiment is not limited thereto.

Referring to fig. 2, a schematic structural diagram of a terminal provided in an exemplary embodiment of the present application is shown, where the terminal may be the terminal 140 in the mobile communication system shown in fig. 1. In this embodiment, a terminal 140 is taken as an example of a UE in an LTE system or a 5G system for explanation, and the terminal includes: a processor 21, a receiver 22, a transmitter 23, a memory 24 and a bus 25.

The processor 21 includes one or more processing cores, and the processor 21 executes various functional applications and information processing by running software programs and modules.

The receiver 22 and the transmitter 23 may be implemented as a communication component, which may be a communication chip, and the communication chip may include a receiving module, a transmitting module, a modulation and demodulation module, and the like, for modulating and/or demodulating information and receiving or transmitting the information through a wireless signal.

The memory 24 is connected to the processor 21 by a bus 25. The memory 24 stores program instructions and data necessary for the terminal.

The processor 21 is operative to execute the program instructions and data in the memory 24 to perform the functions of the various steps in the various method embodiments of the present application.

The processor 21 controls the receiver 22 to implement the following steps 402, 802 by executing at least one program instruction in the memory 24, and the implicit terminal-side receiving function in each step; processor 21 controls transmitter 23 to implement steps 403, 405 and the implicit terminal-side transmit function in each step by executing at least one program instruction in memory 24.

Further, the memory 24 may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.

It will be appreciated that fig. 2 only shows a simplified design of the terminal. In other embodiments, the terminal may include any number of transmitters, receivers, processors, controllers, memories, communication units, etc., and all terminals that may implement the present invention are within the scope of the present invention.

Referring to fig. 3, a schematic structural diagram of an access network device provided in an exemplary embodiment of the present application is shown, where the terminal may be the access network device 120 in the mobile communication system shown in fig. 1. In this embodiment, taking the access network device 120 as an eNB in an LTE system or a gNB in a 5G system as an example for explanation, the access network device includes: a processor 31, a receiver 32, a transmitter 33, a memory 34 and a bus 35.

The processor 31 includes one or more processing cores, and the processor 31 executes various functional applications and information processing by running software programs and modules.

The receiver 32 and the transmitter 33 may be implemented as a communication component, which may be a communication chip, and the communication chip may include a receiving module, a transmitting module, a modulation and demodulation module, etc. for performing modulation and demodulation on information and receiving or transmitting the information through a wireless signal.

The memory 34 is connected to the processor 31 by a bus 35. The memory 54 stores program instructions and data necessary for the terminal.

The processor 51 is operative to execute the program instructions and data in the memory 54 to perform the functions of the various steps in the various method embodiments of the present application.

Processor 31 controls receiver 32 to implement steps 404 and 406 and the implicit receiving function on the access network device side in each step described below by executing at least one program instruction in memory 34; the processor 31 controls the transmitter 33 to implement the steps 401, 801 and the implicit transmission function on the access network equipment side in each step by executing at least one program instruction in the memory 34.

Further, the memory 34 may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.

It will be appreciated that fig. 3 only shows a simplified design of the access network equipment. In other embodiments, the access network device may include any number of transmitters, receivers, processors, controllers, memories, communication units, etc., and all access network devices that may implement the present invention are within the scope of the present invention.

Referring to fig. 4A, a flowchart of a feedback information transmission method provided by an exemplary embodiment of the present application is shown, where the method is used in the mobile communication system shown in fig. 1. The method comprises the following steps.

Step 401, the access network device sends feedback information on a first time unit.

The time length of the first time unit may be represented by a time length of a transmission time interval TTI, or in the embodiment of the present invention, it may also be understood that the first time unit is represented by a TTI. Such as: the time length of one first time unit is 1 TTI. TTI may be measured in milliseconds (ms) or Orthogonal Frequency Division Multiplexing (OFDM), such as: the 1 TTI is 0.5ms in time length, or 7 symbols, 4 symbols, 3 symbols, or 2 OFDM symbols, or 1 OFDM symbol, etc. Since the variable TTI mechanism is introduced in the 5G system, the specific length of the TTI is not limited in the present embodiment.

Alternatively, in the embodiment of the present invention, a time unit may be understood as a minimum unit for carrying data transmission, where the data includes control data and/or traffic data.

It should be added that the time units related to the embodiments of the present invention are all applicable to the above description.

The access network equipment sends feedback information when the terminal needs to be scheduled to send uplink data; and/or the access network equipment sends feedback information when the receiving state of the uplink data needs to be fed back.

Optionally, the feedback information is control information included in the UL grant; or, the control information may be control information included in other signaling having the same function as the UL grant but different signaling names, for example, feedback information for scheduling uplink data transmission.

Optionally, the UL grant may be a signaling transmitted in Downlink Control Information (DCI) formats 0, 0A, 0B, 4A, and 4B in an LTE system, or may be a signaling transmitted in a Downlink control information format of a 5G system, and of course, the Downlink control information may also be other types of Downlink control information, which is not limited in this embodiment.

The feedback information is described below.

The feedback information includes first feedback information and second feedback information.

1) The first feedback information is used for the scheduling terminal to send uplink data through the first HARQ process. The uplink data sent by the first HARQ process is second uplink data initially transmitted by the first HARQ process, or the uplink data sent by the first HARQ process is first uplink data retransmitted by the first HARQ process.

The first HARQ process is one of all uplink HARQ processes supported by the terminal; or, the first HARQ process is one of all uplink HARQ processes supported by the terminal for UL grant free transmission.

Optionally, the terminal initially transmits the first uplink data through the first HARQ process, where the index number is HPN # i corresponding to the first HARQ process; and/or the terminal retransmits the first uplink data through the first HARQ process; and/or the terminal initially transmits the second uplink data through the first HARQ process. Wherein the second uplink data is different from the first uplink data.

When the access network device receives first uplink data sent by the terminal through the first HARQ process before the first time unit and determines that the receiving state of the first uplink data is an ACK (acknowledgement) receiving state, the first feedback information is used to schedule the terminal to initially transmit second uplink data through the first HARQ process, that is, the second uplink data transmitted for the first time through the first HARQ process.

When the access network device receives first uplink data sent by the terminal through the first HARQ process before the first time unit and determines that the receiving state of the first uplink data is a non-acknowledged receiving state NACK, the first feedback information is used for scheduling the terminal to retransmit the first uplink data through the first HARQ process.

When the access network device does not receive the first uplink data sent by the terminal through the first HARQ process before the first time unit, the first feedback information is used to schedule the terminal to initially transmit the first uplink data through the first HARQ process. Or, it can also be understood that the first feedback information is used for scheduling the terminal to initially transmit uplink data through the first HARQ process.

2) The second feedback information is the receiving states of n second HARQ processes, the second HARQ processes are HARQ processes of the terminal, and n is a positive integer.

Optionally, the feedback information is terminal-specific control information, and may be scrambled by using a terminal-specific C-RNTI, and the terminal may determine, according to the specific C-RNTI, that the second feedback information is the reception states of the n second HARQ processes of the terminal.

Optionally, the n second HARQ processes are used for the terminal to send other uplink data on other time units.

Optionally, the other time unit is different from the first time unit, or the other time unit is different from the time unit for transmitting the uplink data through the first HARQ process; the other uplink data refers to uplink data different from the uplink data transmitted through the first HARQ process.

In some scenarios, for example, in a Frequency Division Duplex (FDD) scenario, other time units may be the same as the time unit for transmitting uplink data through the first HARQ process, which is not limited in this embodiment.

Optionally, the other time units may also be the same time units as the first time unit, that is, in this scenario, the terminal may have a capability of transmitting multiple HARQ processes on one same time unit, and at this time, the terminal may also report the capability of whether to support transmission of multiple HARQ processes on one time unit to the access network device, so that the access network device may determine whether the other time units need to be different from the first time unit.

The n second HARQ processes are n uplink HARQ processes in all uplink HARQ processes supported by the terminal; or, the n second HARQ processes are n uplink HARQ processes among all uplink HARQ processes for UL grant free transmission supported by the terminal. The number of all uplink HARQ processes for ul grant free transmission may be equal to n.

Optionally, in this embodiment, the maximum value of all uplink HARQ processes supported by the terminal is n +1, that is, all uplink HARQ processes supported by the terminal include: n second HARQ processes and a first HARQ process; or, the maximum value of all uplink HARQ processes for UL grant free transmission supported by the terminal is n +1, that is, all uplink HARQ processes for UL grant free transmission supported by the terminal include: n second HARQ processes and a first HARQ process; or, the maximum value of all uplink HARQ processes for UL grant free transmission supported by the terminal is n, that is, all uplink HARQ processes for UL grant free transmission supported by the terminal include: n second HARQ processes.

It should be added that the maximum value of all uplink HARQ processes supported by the terminal for UL grant free transmission is less than or equal to the maximum value of all uplink HARQ processes supported by the terminal.

Optionally, each second HARQ process in the n second HARQ processes corresponds to a process number, the process numbers of different second HARQ processes are different, and the process number of each second HARQ process is different from the process number of the first HARQ process.

Suppose that the terminal supports 4 uplink HARQ processes, and the process numbers corresponding to the 4 uplink HARQ processes are 0, 1, 2, and 3, respectively, where if the process number of the first HARQ process is 0, the process number of the second HARQ process is 1, 2, and 3.

Optionally, before the terminal receives the feedback information in the first time unit, because the terminal may not send other uplink data through the second HARQ process, that is, when the access network device sends the feedback information to the terminal, other uplink data sent by the terminal through the second HARQ process may not be received yet, and thus the reception state of the other uplink data cannot be determined, at this time, the access network device sets the reception state of the other uplink data to the default reception state. In this embodiment, the default receiving state is not limited, and illustratively, the default receiving state is a non-acknowledgement receiving state NACK; alternatively, the default reception state is DTX.

In this case, the reception states of the n second HARQ processes include: the terminal sends other uplink data through the second HARQ process, where the second HARQ process is a second HARQ process used by the terminal, and/or the terminal does not send other uplink data through the second HARQ process, where the second HARQ process is a second HARQ process not used by the terminal.

The second feedback information generated by the access network equipment comprises the receiving states of the n second HARQ processes, and the length of the second feedback information is fixed, so that the complexity of blind detection of the second feedback information by the terminal is reduced, and the cost of the terminal is saved.

Of course, the second feedback information generated by the access network device may also indicate the reception status of only part of the second HARQ process.

Optionally, the partial HARQ process is a second HARQ process whose receiving state is a non-acknowledgement state NACK; or, the partial HARQ process is the valid second HARQ process. The valid second HARQ process refers to a second HARQ process corresponding to each other received uplink data before the access network device sends the feedback information. For the HARQ process not used by the terminal (i.e. not using the HARQ process for transmitting other uplink data), it may be understood as the invalid second HARQ process. It can be understood that, in order to enable the terminal device to identify the part of the second HARQ process, a process number corresponding to the part of the second HARQ process may be included in the second feedback information.

Optionally, the second feedback information is further used to indicate a receiving state corresponding to the terminal through the first HARQ process, and at this time, the second feedback information includes n uplink HARQ processes and the receiving state corresponding to the first HARQ process.

Referring to fig. 4B, the feedback information generated by the access network device is composed of two parts: DCIgroup 1 (second feedback information) and DCI group 2 (first feedback information). The DCI group 1 is used for indicating the receiving states corresponding to the n +1 uplink HARQ processes; the DCI group 2 is used for scheduling the terminal to transmit uplink data through the first HARQ process. Wherein DCI represents Downlink Control Information (Downlink Control Information)

The following describes the reception state.

The reception state includes an acknowledgement reception state ACK and a non-acknowledgement reception state NACK.

1) The ACK is used to indicate that the uplink data is correctly received by the access network device.

2) The non-acknowledged receipt status NACK includes an unacknowledged receipt status and/or an incorrect receipt status. The non-receiving state is used for indicating that the uplink data is not received by the access network equipment; the incorrect reception state is used to indicate that the access network device receives uplink data, but the uplink data received by the access network device is different from the uplink data sent by the terminal, that is, the uplink data is received incorrectly.

In step 402, the terminal receives feedback information on a first time unit.

Since there is a certain distance between the access network device and the terminal, from the perspective of absolute time, the position of the first time unit when the access network sends the feedback information is different from the position of the first time unit when the terminal receives the feedback information in this embodiment. In other words, the time unit for the access network device to send the feedback information is delayed from the time unit for the terminal to receive the feedback information.

Referring to fig. 4C, the terminal sends the feedback information at the third time unit 46, the access network device receives the feedback information at the third time unit 48, and a certain transmission delay 49 exists between the third time unit 48 and the third time unit 46.

And after receiving the feedback information, the terminal analyzes the feedback information to obtain first feedback information and second feedback information.

And step 403, the terminal sends uplink data through the first HARQ process in the second time unit according to the first feedback information.

Optionally, the time interval between the second time unit and the first time unit is predefined; or, pre-configured by the access network device; or, dynamically notified by the access network device; or dynamically notified to the access network device by the terminal.

If the terminal sends the first uplink data to the access network device through the first HARQ process before the first time unit, the terminal determines whether the first uplink data needs to be retransmitted, and initially transmits the second uplink data according to the first feedback information, or retransmits the first uplink data.

And if the terminal does not send the uplink data to the access network equipment through the first HARQ process before the first time unit, the terminal initially transmits the first uplink data according to the first feedback information.

Step 404, the access network device receives, in a second time unit, the uplink data sent by the terminal through the first HARQ process.

Because a certain distance exists between the terminal and the access network device, a certain delay exists between the second time unit of the terminal sending the uplink data and the second time unit of the access network device receiving the uplink data. The explanation here is the same as the explanation of the delay of the first time unit in step 402, and the description of this embodiment is omitted here.

In summary, in the feedback information transmission method provided in this embodiment, the access network device jointly sends the first feedback information and the second feedback information to the terminal, so that after receiving the feedback information, the terminal can obtain the receiving state corresponding to other uplink data and can also obtain the resource required for retransmitting the first uplink data or initially transmitting the second uplink data; the access network equipment is not required to send the first feedback information and the second feedback information to the terminal respectively, so that the terminal only needs to perform blind detection for one time when receiving the feedback information, the first feedback information and the second feedback information do not need to be subjected to blind detection respectively, and the number of times of blind detection of the terminal is reduced.

Meanwhile, since the second feedback information includes the reception states of the n second HARQ processes, even if the terminal device fails to detect the feedback information corresponding to the second HARQ process before receiving the feedback information including the first feedback information and the second feedback information, the feedback information corresponding to the second HARQ process can be determined by the feedback information including the first feedback information and the second feedback information, so that the robustness of the feedback information of the second HARQ process is increased, and the method is particularly suitable for a transmission service with a high requirement on transmission reliability, such as URLLC.

In addition, in the LTE system, the first feedback information and the second feedback information are carried by mutually independent DCI, and each independent DCI needs to be scrambled by using a user-specific identifier, that is, the user-specific identifiers are added after the first feedback information and the second feedback information, respectively. The user-specific identity refers to a Cell Radio Network Temporary Identifier (C-RNTI) including 16 bits. At this time, the resource consumed by the access network equipment for sending the first feedback information is at least the bit number +16bits of the first feedback information; and the resource consumed by the access network equipment for sending the second feedback information is at least the bit number +16bits of the second feedback information. In the feedback information transmission method provided in this embodiment, the first feedback information and the second feedback information are fed back jointly, so that the access network device only needs to add a specific identification code after the feedback information, thereby reducing channel resources occupied by one identification code and saving channel overhead.

In addition, the second feedback information carries the receiving states of the plurality of second HARQ processes, so that the timeliness of the receiving state of the uplink data fed back by the access network equipment is improved.

In addition, for the transmission of the uplink data on the unlicensed spectrum, because the access network device needs to perform LBT before sending the feedback information, and can send the feedback information by using the unlicensed spectrum only when detecting that the channel is idle, after contending for the unlicensed frequency band resource, the access network device once feeds back all the second HARQ processes corresponding to the terminal or the reception states of all the second HARQ processes for the UL grant free, so that the timeliness of the access network device feeding back the uplink data is ensured in a scene of transmitting the uplink data through the unlicensed spectrum, and the transmission of the uplink data on the unlicensed spectrum is facilitated.

Alternatively, steps 401 and 404 may be implemented separately as method embodiments on the access network device side; steps 402 and 403 may be implemented separately as an embodiment of the method on the terminal side, which is not limited in this embodiment.

Alternatively, the time lengths of the different time units may be the same or different. The first time unit and the second time unit can be in the same TTI or in different TTIs; the third time unit and the first time unit may be in the same TTI or in different TTIs.

It should be added that, in the embodiment of the present invention, the uplink data includes uplink service data and/or uplink control data, where the uplink data includes the first uplink data and the second uplink data in this step.

In one scenario, uplink data is transmitted between the access network device and the terminal based on a UL grant mechanism, and the access network device schedules the terminal to transmit the uplink data through the first HARQ process for the first time. At this time, the terminal needs to know the uplink transmission resource required for sending the uplink data, and therefore, the access network device needs to send the first feedback information to the terminal to notify the terminal of the uplink transmission resource.

In this scenario, the access network device needs to send, to the terminal, an uplink transmission resource required for transmitting the first uplink data before the terminal sends the first uplink data through the first HARQ process.

In another scenario, uplink data is transmitted between the access network device and the terminal based on a UL grant free mechanism, at this time, the terminal selects an uplink transmission resource from a resource pool by itself, and transmits first uplink data through a first HARQ process using the transmission resource, and after receiving the first uplink data, the access network device may schedule the terminal to retransmit the first uplink data through first feedback information, or initially transmit second uplink data.

In this scenario, referring to fig. 4D, based on the embodiment shown in fig. 4A, a flowchart of a feedback information transmission method provided in another exemplary embodiment of the present application is shown, where the method is used in the mobile communication system shown in fig. 1. Before step 401, the method comprises the following steps.

Step 405, the terminal sends the first uplink data through the first HARQ process in the third time unit.

The third time unit precedes the first time unit.

The third time unit may be a time unit closest to a time at which the terminal has a need to transmit the first uplink data.

When the terminal has a need to transmit the first uplink data, the terminal needs to process the first uplink data, for example: the first uplink data is encoded, modulated, etc., and this processing takes a certain time. In this case, the third time unit may be a time unit delayed by a certain time from the time when the terminal has a need to transmit the first uplink data.

Optionally, the third time unit is a time unit determined by the terminal based on the UL grant free transmission mechanism. For example, the time position corresponding to the UL grant free transmission resource is determined in a predefined or pre-configured manner by the access network device, where the time position may be represented by a time unit. Optionally, when the terminal has a need to transmit the first uplink data, a time unit closest to the need time and subsequent to the need time may be selected as the third time unit.

Referring to fig. 4E, assuming that the terminal has a need to transmit the first uplink data in the first TTI42, the terminal processes the first uplink data and transmits the first uplink data using the first HARQ process in the third time unit 44 (i.e., the third TTI).

The uplink data sent by the first HARQ process includes first uplink data and/or second uplink data.

The first uplink data transmitted by the terminal in the third time unit may be based on uplink scheduling or may be based on UL grant free.

Step 406, the access network device receives, at the third time unit, the first uplink data sent by the terminal through the first HARQ process.

Since there is a certain distance between the access network device and the terminal, from the perspective of absolute time, the position of the third time unit when the terminal sends the first uplink data is different from the position of the third time unit when the access network device receives the first uplink data in this embodiment. In other words, the time unit for the access network device to receive the uplink data has a certain delay compared with the time unit for the terminal to transmit the uplink data.

After receiving the first uplink data, the access network device processes the received first uplink data to recover the first uplink data sent by the terminal, for example: the terminal demodulates and decodes the first uplink data. In the processing process, the access network device may determine a receiving state of the first uplink data.

Optionally, the method for determining the receiving state of the first uplink data by the access network device includes, but is not limited to: decoding and/or Cyclic Redundancy Check (CRC).

After the access network device determines the receiving state of the first uplink data, it needs to feed back the receiving state to the terminal, that is, step 401 is executed.

At this time, if the access network device determines that the reception state of the first uplink data is the reception confirmation state ACK, in step 401, the first feedback information generated by the access network device schedules the terminal to initially transmit the uplink data, for example, the second uplink data, through the first HARQ process; correspondingly, in step 403, the terminal initially transmits the second uplink data through the first HARQ process in the second time unit according to the first feedback information;

if the access network equipment determines that the receiving state of the first uplink data is a non-confirmed receiving state NACK, a first feedback information scheduling terminal generated by the access network equipment retransmits the first uplink data through a first HARQ process; accordingly, in step 403, the terminal retransmits the first uplink data through the first HARQ process on the second time unit according to the first feedback information.

In step 403, the terminal needs to determine whether to retransmit the first uplink data or initially retransmit the second uplink data.

In one case, when the second feedback information includes a receiving state corresponding to the first HARQ process, the terminal determines, according to the receiving state corresponding to the first HARQ process in the second feedback information, whether the first feedback information is used by the scheduling terminal to retransmit the first uplink data or the scheduling terminal to initially transmit the second uplink data.

In another case, when the second feedback information does not include the receiving state corresponding to the first HARQ process, the terminal determines, according to the indication information carried in the first feedback information, whether the first feedback information is used by the scheduling terminal to retransmit the first uplink data or the scheduling terminal to initially transmit the second uplink data. Or, when the second feedback information does not include the receiving state corresponding to the first HARQ process, the terminal determines, according to other control information included in a downlink channel carrying the feedback information, whether the first feedback information is used by the scheduling terminal to retransmit the first uplink data or the scheduling terminal to initially transmit the second uplink data.

The indication information or other control information is used for indicating whether the terminal retransmits the first uplink data.

When the indication information in the first feedback information indicates that the terminal retransmits the first uplink data, the first feedback information is used for scheduling the terminal to retransmit the first uplink data in the third time unit. When the indication information in the first feedback information indicates that the terminal initially transmits the second uplink data, the first feedback information is used for scheduling the terminal to initially transmit the second uplink data in the third time unit.

And when the first feedback information comprises configuration information of the first resource pool, the terminal selects an uplink transmission resource for primarily transmitting second uplink data from the configured first resource pool according to the configuration information of the first resource pool, and primarily transmits the second uplink data through the selected uplink transmission resource.

And when the first feedback information comprises configuration information of a second resource pool, the terminal selects an uplink transmission resource for retransmitting the first uplink data from the configured second resource pool according to the configuration information of the second resource pool, and retransmits the first uplink data through the selected uplink transmission resource.

Optionally, the first feedback information includes a process number of the first HARQ process, so that the terminal can determine that the first feedback information is used for scheduling uplink data corresponding to the first HARQ process.

Optionally, the first feedback information does not include the process number of the first HARQ process, so that when the terminal receives the first feedback information in the first time unit, it can determine that the first feedback information is used for scheduling uplink data corresponding to the first HARQ process according to a time interval between the third time unit and the first time unit, that is, the process number of the first HARQ process is implicitly indicated by the time interval between the third time unit and the first time unit.

Referring to fig. 4F, it is assumed that the maximum value of all uplink HARQ processes supported by the terminal is 8, and process numbers of the 8 uplink HARQ processes are #0, #1, #2, #3, #4, #5, #6, and #7, respectively.

If the terminal transmits the first uplink data using HPN #2 (corresponding to the first HARQ process) in the third time unit, the second HARQ process is the remaining uplink HARQ processes, i.e., the uplink HARQ processes corresponding to HPN #0, HPN #1, and HPN #3-HPN # 7. The meaning of HPN is a Process Number (HARQ Process Number).

If the time duration from the time when the access network device receives the first uplink data sent by the terminal to the time when the access network device feeds back the receiving state of the first uplink data is 2 time units, in fig. 4F, the second feedback information generated by the access network device in the 8 th time unit may at least include the receiving states of the uplink data corresponding to the 5 uplink HARQ processes (i.e., the receiving states of other uplink data corresponding to HPN #0, HPN #1, and HPN #3-HPN # 5). Optionally, the second feedback information may further include a reception state of upstream data corresponding to HPN # 2.

Optionally, the second feedback information further includes the receiving status of other upstream data corresponding to HPN #6 and HPN # 7. Because the processing delay is limited, in the second feedback information generated by the access network device, the receiving states of other uplink data corresponding to the HPN #6 and the HPN #7 cannot truly reflect the receiving states of the two second HARQ processes, and at this time, the default receiving states may be adopted to reflect the receiving states of the HPN #6 and the HPN # 7.

The first feedback information is used for the scheduling terminal to retransmit the first uplink data or initially transmit the second uplink data through the first HARQ process. Optionally, the first feedback information is further used to schedule the second HARQ process to send other uplink data.

It should be added that the first feedback information shown in fig. 4F is used to schedule the uplink data corresponding to the first HARQ process HPN #2, the second feedback information is the reception status corresponding to the HPN #0, HPN #1, HPN #3, HPN #4, HPN #5, HPN #6, and HPN #7, and both the first feedback information and the second feedback information are received in the first time unit. The lines connected to the first feedback information and the second feedback information in fig. 4F are not used to indicate time units, but are used to indicate process numbers of related uplink HARQ processes.

Optionally, before the terminal sends the first uplink data through the first HARQ process, the terminal sends other uplink data through the second HARQ process; and/or after the terminal transmits the first uplink data through the first HARQ process, the terminal transmits other uplink data through the second HARQ process, which is not limited in this embodiment.

The features of the second feedback information will be described in detail below with reference to the embodiments shown in fig. 4A and 4D.

In an LTE system, the second UL grant sent by the access network device to the terminal may also include receiving statuses corresponding to multiple uplink HARQ processes, and in order to ensure that the terminal can identify which uplink data each receiving status corresponds to, the access network device may carry a New Data Indicator (NDI) in the first UL grant, where the NDI is used to indicate a process number corresponding to each uplink HARQ process, and at this time, the terminal may determine the corresponding uplink HARQ process according to the NDI, thereby determining the corresponding receiving status.

When uplink data is transmitted between the access network device and the terminal based on the UL grant free, the access network device does not send the first UL grant to the terminal, and the terminal selects an uplink transmission resource by itself to transmit the uplink data, at this time, the manner for determining the receiving state corresponding to the uplink HARQ process in the LTE system is no longer applicable.

Optionally, when the second feedback information includes a reception status indicating a plurality of uplink HARQ processes, in order to ensure that the terminal can determine which uplink data each reception status corresponds to, the second feedback information indicates the reception status in a form of a bitmap (bitmap).

The bitmap comprises preset bits, and for each bit in the bitmap, the bit is used for indicating a receiving state corresponding to one uplink HARQ process, and different bits are used for indicating the receiving state corresponding to the corresponding uplink HARQ process. In this case, because the form of bitmap may implicitly indicate the uplink HARQ process corresponding to each receiving state, and may implicitly indicate the uplink data corresponding to each receiving state, the second feedback information may not include the process number of each uplink HARQ process.

Illustratively, the receiving state corresponding to the uplink HARQ process corresponding to each bit (bit) is represented by a different state of the bit in the bitmap.

If the second feedback information is the receiving states corresponding to 8 uplink HARQ processes (including the receiving state corresponding to the first HARQ process and the receiving state corresponding to the second HARQ process), the bit number of the bitmap is 8 bits, and the representation form is X₁X₂X₃X₄X₅X₆X₇X₈。

Wherein, X_iIs 0 or 1, and is used to indicate the receiving state corresponding to the ith uplink HARQ process, or is used to indicate the receiving state corresponding to the uplink HARQ process with the process number # HPN (i-1). 0 indicates that the reception state is an acknowledgment reception state ACK, and 1 indicates that the reception state is a non-acknowledgment reception state NACK. Alternatively, 1 indicates that the status is ACK and 0 indicates NACK.

In fig. 4F, if the access network device determines that the reception state of the upstream data corresponding to HPN #0 and HPN #1 is the acknowledged reception state ACK and the reception state of the upstream data corresponding to HPN #2 to HPN #5 is the unacknowledged reception state NACK, X₁X₂X₃X₄X₅X₆X₇X₈Is 11000000, wherein the access network device has not been ready to process the upstream data corresponding to HPN #6 and HPN #7, and thus the reception status of the upstream data corresponding to HPN #6 and HPN #7 may be the default reception status NACK.

Optionally, the number of bits (number of bits) of the bitmap is equal to the number of uplink HARQ processes in the second feedback information; or, the number of bits (number of bits) of the bitmap is greater than the number of uplink HARQ processes in the second feedback information.

Optionally, the access network device does not use a bitmap form to indicate the receiving status, but uses a non-bitmap form to indicate the receiving status.

Illustratively, the access network device passes through CEILING { log }₂(n +1) } bits denote each uplink HARQ process, wherein CEILING { x } denotes rounding up x. Alternatively, CEILING { x } may also be expressed asThis embodiment is not limited to this.

The bit combinations corresponding to different uplink HARQ processes are different, and the receiving state corresponding to each uplink HARQ process is represented by 1 bit. Thus, each bit combination and the 1bit form a receiving state corresponding to each uplink HARQ process, and therefore second feedback information is obtained. Wherein n +1 is a maximum value of the uplink HARQ process supported by the terminal, or n +1 is a maximum value of the uplink HARQ process supported by the terminal for UL grant free transmission.

If the maximum value of the uplink HARQ process supported by the terminal is 8, the access network equipment passes the log₂8-3 bits represent each uplink HARQ process.

Wherein 000 represents an uplink HARQ process with a process number of 0; 001 represents an uplink HARQ process with a process number of 1; 010 indicates an uplink HARQ process with a process number of 2; 011 indicates an uplink HARQ process with a process number of 3; 100 denotes an uplink HARQ process with a process number of 4; 101 represents an uplink HARQ process with a process number of 5; 110 represents an uplink HARQ process with a process number of 6; and 111, an uplink HARQ process with a process number of 7.

The access network equipment represents the receiving state by 1bit, wherein 0 represents that the receiving state is an acknowledgement receiving state ACK, and 1 represents that the receiving state is a non-acknowledgement receiving state NACK.

In fig. 4F, when the access network device determines that the reception state of the uplink data corresponding to HPN #0 and HPN #1 is the acknowledgment reception state ACK and the reception state of the uplink data corresponding to HPN #2-HPN #5 is the non-acknowledgment reception state NACK, the second feedback information is 0001 (indicating that the reception state of the uplink HARQ process having the process number 0 is the acknowledgment reception state ACK), 0011 (indicating that the reception state of the uplink HARQ process having the process number 1 is the acknowledgment reception state ACK), 0100 (indicating that the reception state of the uplink HARQ process having the process number 2 is the non-acknowledgment reception state NACK), 0110 (indicating that the reception state of the uplink HARQ process having the process number 3 is the non-acknowledgment reception state NACK), 1000 (indicating that the reception state of the uplink HARQ process having the process number 4 is the non-acknowledgment reception state NACK), 1010 (indicating that the reception state of the uplink HARQ process having the process number 5 is the non-acknowledgment reception state NACK), 1100 (indicating that the reception state of the uplink HARQ process with the process number of 6 is the default reception state NACK), and 1110 (indicating that the reception state of the uplink HARQ process with the process number of 7 is the default reception state NACK).

Optionally, when the second feedback information includes reception statuses for indicating multiple uplink HARQ processes, in order to ensure that the terminal can determine which uplink data each reception status corresponds to, the multiple reception statuses included in the second feedback information may further have a specific correspondence relationship with a time position at which the terminal transmits the uplink data.

Assuming that the access network device feeds back the receiving state of uplink data corresponding to one uplink HARQ process in a (# n) time unit, where (# n) indicates a sequence number of the time unit, at this time, the receiving state corresponding to the uplink HARQ process included in the second feedback information may correspond to a time unit set included between a (# n-x) time unit and a (# n-y) time unit, where the time unit set may include a (# n-x) time unit and a (# n-y) time unit, where x and y may be preconfigured by the access network device, or dynamically notified, or notified by the terminal to the access network device, or may be notified by another notification method.

Assuming that x is 6, y is 2, and the receiving state adopts 1-bit feedback, the second feedback information transmitted by the access network device in the (# n) time unit includes 5bits, which are respectively the receiving states corresponding to the uplink data transmitted by the terminal in the (# n-6), (# n-5), (# n-4), (# n-3), and (# n-2) time units.

Optionally, if the access network device only receives the uplink data sent by the terminal in the (# n-6) and (# n-4) time units when feeding back the second feedback information, and it is determined that the receiving states corresponding to the two uplink data are both reception confirmation states ACK, the access network device may only set, as ACK, the bit information corresponding to the two time units in the 5bits, and adopt a default reception state NACK for the remaining 3bits information. In this case, the second feedback information may not include the process number of the uplink HARQ process.

Optionally, when uplink data is transmitted between the terminal and the access network device through multiple codewords, second feedback information generated by the access network device is fed back for each codeword, and at this time, each codeword corresponds to one uplink HARQ process; or the second feedback information generated by the access network device performs joint feedback on multiple code words transmitted by the same time unit, and at this time, the multiple code words transmitted by the same time unit correspond to the same uplink HARQ process.

Optionally, in this application, the second feedback information further includes time indication information in addition to the reception states of the n second HARQ processes, and the time indication information is used to indicate time units corresponding to the reception states of the n second HARQ processes. At this time, before step 402, the terminal sends uplink data through n second HARQ processes in n time units, where the n time units are time units for the terminal to transmit the uplink data, and the n time units are all located before the first time unit in the time domain.

Optionally, n has a value of 1; alternatively, the value of n is 2 or more. In the present application, the case where the value of n is 2 or more will be described.

The terminal sends uplink data through n second HARQ processes in n time units, where the sending of the uplink data by the terminal refers to: each time unit corresponds to one second HARQ process, and the terminal sends uplink data through the corresponding second HARQ process in each time unit.

Optionally, the n time units are consecutive in the time domain; alternatively, the n time units are not contiguous in the time domain.

Referring to fig. 4G, the terminal transmits uplink data through the uplink HARQ process with process number 0 at j-5 time unit; sending uplink data through an uplink HARQ process with the process number of 1 in the j-4 time unit; sending uplink data through an uplink HARQ process with the process number of 2 in the j-3 time unit; sending uplink data through an uplink HARQ process with the process number of 3 in the j-2 time unit; and receiving the receiving state and the time indication information corresponding to the n second HARQ processes on the jth time unit, namely, the jth time unit is the first time unit. Wherein, the time unit corresponding to each uplink HRAQ process is continuous in the time domain.

Optionally, in the application, the terminal sends uplink data through an uplink HARQ process with a HARQ process number i, which may be understood as that the terminal sends uplink data with the HARQ process number i, where i may be an integer not less than 0.

Referring to fig. 4H, the terminal transmits uplink data through an uplink HARQ process with a process number of 1 in the j-5 time unit; sending uplink data through an uplink HARQ process with the process number of 2 in the j-3 time unit; sending uplink data through an uplink HARQ process with the process number of 3 in the j-1 time unit; and receiving the receiving state and the time indication information corresponding to the n second HARQ processes on the jth time unit, namely, the jth time unit is the first time unit. Wherein, the time unit corresponding to each uplink HRAQ process is discontinuous in the time domain.

Optionally, in the present application, the time indication information indicates, by a display indication manner, a time unit corresponding to the receiving state of each uplink HARQ process. That is, the second feedback information includes information bits corresponding to the time indication information.

Optionally, in this application, the time indication information indicates the time unit corresponding to the reception state of each uplink HARQ process in an implicit indication manner, and at this time, the information bit used for indicating the reception state in the second feedback information may also be used for indicating the time indication information.

The time unit corresponding to the reception state of each uplink HARQ process refers to a time unit for transmitting uplink data through the uplink HARQ process. Such as: the second feedback information includes a 3-bit receiving state, where the 3-bit receiving state is a receiving state corresponding to the uplink HARQ process with HARQ process number 1 in fig. 4H, the time unit corresponding to the receiving state is a j-5 th time unit, the receiving state corresponding to the uplink HARQ process with HARQ process number 2, the time unit corresponding to the receiving state is a j-3 th time unit, the receiving state corresponding to the uplink HARQ process with HARQ process number 3, and the time unit corresponding to the receiving state is a j-1 th time unit.

Optionally, when the terminal further sends uplink data through the first HARQ process before the jth time unit, the second feedback information is further used to indicate a receiving state corresponding to the first HARQ process, and the time indication information is further used to indicate a time unit corresponding to the receiving state of the first HARQ process. Such as: in fig. 4H, the uplink HARQ process with HARQ process number 3 is a first HARQ process, and the second feedback information received by the terminal includes a receiving state of the first HARQ process and a time unit corresponding to the receiving state.

Optionally, the time indication information in the second feedback information indicates a time unit corresponding to the reception state of each second HARQ process. Such as: in FIG. 4H, the time indication information indicates the j-5 th time unit, the j-3 rd time unit, and the j-1 th time unit.

Optionally, the time indication information in the second feedback information indicates a time range, where the time range includes time units corresponding to the reception states of the n second HARQ processes. In other words, the time indication information indicates a time range including n time units. At this time, when determining the uplink HARQ process corresponding to each reception state, the terminal determines a time unit for uplink data transmission from the time range indicated by the time indication information, where each time unit for uplink data transmission corresponds to one reception state and one uplink HARQ process, and may determine the uplink HARQ process corresponding to each reception state according to the corresponding relationship.

Such as: in fig. 4H, the j-5 th time unit corresponds to the uplink HARQ process with HARQ process number 1, the j-3 th time unit corresponds to the uplink HARQ process with HARQ process number 2, and the j-1 th time unit corresponds to the uplink HARQ process with HARQ process number 3. If the receiving state in the second feedback information is 3bits, the receiving state is respectively used for indicating: ACK, NACK, and ACK; if the time range indicated by the time indication information in the second feedback information is [ j-5, j-1], the earliest time unit (# j-5) for uplink data transmission in the time domain determined in the time range corresponds to a receiving state ACK corresponding to the first bit information, and the receiving state ACK is the receiving state of the uplink HARQ process with the HARQ process number of 1; the second time unit (# j-3) used for uplink data transmission determined from the time range corresponds to the receiving state NACK corresponding to the second bit information, and the receiving state NACK is the receiving state of the uplink HARQ process with the HARQ process number of 2; the third time unit (# j-1) for uplink data transmission determined from the time range corresponds to the reception state ACK corresponding to the third bit information, and the reception state ACK is the reception state of the uplink HARQ process with HARQ process number 3.

When the time indication information indicates a time range including n time units, the time indication information includes, but is not limited to, the following expressions.

The first method comprises the following steps: the time indication information includes a time start point and a time end point of the time range. Illustratively, in FIG. 4H, the time range is [ j-5, j-1] and the time indication information includes a (# j-5) time cell and a (# j-1) time cell.

And the second method comprises the following steps: the time indication information includes a time start point and a time length of the time range. Illustratively, in FIG. 4H, the time range is [ j-5, j-1], and the time indication information includes (# j-5) time units and a time length of 5 time units.

And the third is that: the time indication information includes a time end and a time length of the time range. Illustratively, in FIG. 4H, the time range is [ j-5, j-1], and the time indication information includes (# j-1) time units and a time length of 5 time units.

And fourthly: the time indication information includes a time length of a time range, a time start or a time end of the time range being preconfigured. Such as: the time starting point of the time range which is configured for the terminal by the access network equipment in advance is the p-th time unit before the first time unit, and p is a positive integer. For another example: the access network device configures the terminal with the time end point of the time range in advance as the q time unit before the first time unit, wherein q is a positive integer. p is greater than q. Optionally, the time end point of the time range pre-configured for the terminal by the access network device is one time unit before the first time unit or the first time unit. Illustratively, in fig. 4H, the time range is [ j-5, j-1], the time indication information includes a time length of 5 time units, and the time end point of the time range configured by the access network device for the terminal is the first time unit before the first time unit.

And a fifth mode: the time indication information includes a time start point or a time end point of a time range, and a time length of the time range is preconfigured.

Optionally, the time length of the time range pre-configured by the access network device for the terminal is associated with the number of bits corresponding to the reception states of the n second HARQ processes. Such as: when the bit number in the second feedback information is 3bits, the time length of the time range includes 3 time units for uplink data transmission. Illustratively, in fig. 4H, the time range is [ j-5, j-1], the time indication information includes a time end (# j-1), the time length of the time range configured by the access network device for the terminal is associated with the number of bits in the receiving state, the time length is determined to be 3 time units for uplink data transmission, respectively time unit (# j-1), time unit (# j-3) and time unit (# j-5) in sequence from the time end (# j-1), and the time length of the time range is 5 time units.

Optionally, a time start point or a time end point corresponding to a time range indicated by the time indication information is predefined, and a time length of the time range is associated with a number of bits corresponding to the reception states of the n HARQ processes. In this embodiment, it may be considered that the feedback information sent by the access network device in the first time unit may include only the receiving statuses of n HARQ processes, where the time length of the time range in which n time units corresponding to the receiving statuses of the n HARQ processes are located is associated with the number of bits used for representing the receiving statuses of the n HARQ processes, and it may be understood that, at this time, the time range indicated by the time indication information is determined by a predefined time starting point or time ending point and an implicitly associated time length. That is, it can be understood that the feedback information of the first time unit includes the reception state without explicit time indication information, or it can be understood that the time indication information and the reception states of the n HARQ processes share a control field included in the feedback information, and the control field is composed of one or more bits. Assuming that the feedback information included in the first time unit includes X bits, a specific value of each bit of the X bits may indicate a receiving state of a corresponding HARQ process, and the number of the X bits, that is, X may indicate a time length of a time range in which the HARQ process corresponding to the X bits is located.

Optionally, in each of the above representations of the time indication information, the time starting point and the time ending point are both represented by taking the first time unit as a reference time unit, and in actual implementation, they may also be represented by the sequence number of the corresponding time unit, such as: the 2 nd time unit, the 5th time unit, etc., the present embodiment does not limit the representation manner of the time starting point and the time ending point.

Optionally, in each of the above representations of the time indication information, the time length is represented by the number of time units, and in actual implementation, the time length may also be represented by a time duration, for example: 1ms, 2ms, etc.

Optionally, in this application, the time starting point of the time range may be a starting boundary of a certain time unit included in the time range, and the time ending point of the time range may be an ending boundary of a certain time unit included in the time range, and for convenience of description, in the embodiment of the present invention, the description may be simplified as follows: the time start or time end of a time range may be a certain time unit comprised by the time range. For example, in the present application, the following two descriptions are equivalent. One description is: the time starting point of the time range is the starting boundary of the earliest time unit included in the time range, and the time ending point of the time range is the ending boundary of the latest time unit included in the time range; another equivalent description is: the time start of a time range is the earliest time unit in time that the time range includes, and the time end of the time range is the latest time unit in time that the time range includes.

Alternatively, in each representation form of the time indication information, it is required to ensure that the bit number of the receiving state in the second feedback information is associated with the time length of the time range indicated by the time indication information. The number of bits of the receiving state in the second feedback information is associated with the time length of the time range indicated by the time indication information, so that the terminal can directly determine the corresponding relationship between the receiving state and the time unit, and the signaling overhead of the access network equipment is saved.

Optionally, the bit number of the receiving status in the second feedback information may also not be associated with the time length of the time range indicated by the time indication information, referring to fig. 4I, the bit number of the receiving status in the second feedback information is 5bits, and the time range indicated by the time indication information includes 7 time units for uplink data transmission. At this time, the terminal cannot directly determine the corresponding relationship between the 7 time units and the 5bit receiving state, and the access network device needs to send an additional signaling to the terminal to notify the terminal of the manner of determining the corresponding relationship between the time units and the receiving state; or, the terminal may determine the corresponding relationship between the time unit and the receiving state time according to a preset rule. For example, referring to fig. 4I, the preset rule may be that the receiving state in the second feedback information corresponds to a time unit that is included in the time range indicated by the time indication information and is earlier in the time domain position, for example, in this example, 5bits correspond to time units labeled as 1 to 5, respectively.

Optionally, in this application, the time starting point of the time range is the earliest time unit in the time domain among the n time units, such as: in fig. 4H, the time start point of the time range is time unit (# j-5). In this way, the signalling overhead of the access network equipment is saved.

Optionally, in this application, the time end point is a time unit that is latest in a time domain among the n time units. Such as: in fig. 4H, the time end point of the time range is a time unit (# j-1). In this way, the signalling overhead of the access network equipment is saved.

Alternatively, when the time start point of the time range is the earliest time unit in the time domain among the n time units and the time end point is the latest time unit in the time domain among the n time units, the time length is a time length between the earliest time unit in the time domain to the latest time unit in the time domain among the n time units.

For the transmission of uplink data in the UL grant free scene, the terminal does not transmit the uplink data based on the scheduling of the access network device, and therefore, the access network device cannot determine the time position of the terminal for transmitting the uplink data in advance. Access network devices typically detect through blindness, for example: whether the reference signal exists is detected to determine whether the terminal transmits uplink data. At this time, the access network device may have a missed detection condition, that is, the terminal sends uplink data on the preconfigured resource, but the access network device does not detect the uplink data. In this case, if the terminal waits for the reception state of the uplink data fed back by the access network device, there is a problem that the reception state cannot be reached, which increases the processing delay of the uplink data. In order to reduce the processing delay, for a terminal performing UL grant free data transmission, an access network device may configure an automatic retransmission timer for the terminal through a high-level signaling, and after the terminal sends uplink data, the terminal starts the automatic retransmission timer, and if the terminal has not received the receiving state of the uplink data when the timing duration of the automatic retransmission timer reaches, the terminal automatically retransmits the uplink data. Therefore, the terminal does not wait for the receiving state of the uplink data all the time, and the processing time delay of the uplink data is reduced.

After the terminal sends the uplink data through the uplink HARQ process, the retransmission timer is used for triggering the terminal to retransmit the uplink data through the uplink HARQ process, and the starting time of the automatic retransmission timer is positioned behind the time unit corresponding to the uplink HARQ process.

Optionally, if the terminal sends uplink data in the kth time unit, the starting time of the automatic retransmission timer is located in the (k +1) th time unit, that is, after the terminal sends uplink data in the kth time unit, the automatic retransmission timer is started from the (k +1) th time unit, and assuming that the automatic retransmission timer can be represented by m time units, if the reception state feedback of the access network device for the uplink data sent by the terminal in the kth time unit is not received in the (k + m) th time unit, the terminal may automatically retransmit the uplink data sent in the kth time unit in the (k + m +1) th time unit; or, the starting time of the automatic retransmission timer is located in the (k + h) th time unit, h is configured in advance by the access network device and is sent to the terminal, or h is in a standard protocol specification, or h can also be notified to the terminal by the access network device through dynamic signaling, for example, physical layer signaling. Optionally, h is configured to indicate a feedback delay, where the feedback delay is a time interval between a time when the terminal sends uplink data through the uplink HARQ process and a time when the terminal receives the reception state of the uplink HARQ process. Further, the feedback delay is a minimum duration of an interval between a time when the terminal transmits uplink data through the uplink HARQ process and a time when the terminal receives the receiving state of the uplink HARQ process. For example, if the terminal sends data in the kth time unit, if the terminal does not receive the feedback of the reception state of the access network device for the uplink data sent by the terminal in the kth time unit in the k + h time unit, the terminal may start an automatic retransmission timer for timing. Alternatively, the terminal may start the automatic retransmission timer at the (k + h) th time unit, or the (k + h +1) th time unit. If the automatic retransmission timer can be represented by m time units, if the terminal has not received the feedback of the reception status of the access network device for the uplink data sent by the terminal in the kth time unit in the (k + h + m +1) th time unit or the (k + h + m +1) th time unit, the terminal can automatically retransmit the uplink data sent in the kth time unit in the (k + h + m +1) th or the (k + h + m + 2) th time unit.

The feedback time delay is determined according to at least one of transmission delay between the terminal and the access network equipment, delay of the access network equipment for demodulating uplink data and delay of the access network equipment for modulating the second feedback information.

Since the automatic retransmission timer is configured in the terminal, after the terminal sends the uplink data through the uplink HARQ process, in order to ensure that the terminal can receive the receiving state corresponding to the uplink data before automatically retransmitting the uplink data, that is, to ensure the validity of the receiving state received by the terminal, or to ensure the validity of the receiving state fed back by the access network device, in the application, the time range includes a sub-time range, the time length of the sub-time range is less than or equal to the retransmission waiting duration, and the retransmission waiting duration includes the timing duration of the automatic retransmission timer. The starting time point of the sub-time range is a time unit corresponding to a second HARQ process meeting a preset condition in the n second HARQ processes, and the ending time point of the sub-time range is the first time unit or a time unit before the first time unit. The second HARQ process satisfying the preset condition is a second HARQ process that performs automatic retransmission earliest in a time domain among the n second HARQ processes. Because the time starting point of the sub-time range in the time range is the time unit corresponding to the second HARQ process meeting the preset condition, and the time length of the sub-time range is less than the timing duration of the automatic retransmission timer corresponding to the second HARQ process meeting the preset condition, it can be ensured that the receiving state of the uplink data is received before the terminal automatically retransmits the uplink data corresponding to the second HARQ process meeting the preset condition, and the validity of the receiving state is ensured.

Optionally, the time start of the sub-time range is the same as the time start of the time range; and/or the time end of the sub-time range is the same as the time end of the time range.

Schematically, in fig. 4J, after the terminal sends uplink data through the uplink HARQ process in the kth time unit, the starting time of the automatic retransmission timer is located in the (k +1) th time unit, and the timing durations of the automatic retransmission timers corresponding to the uplink HARQ processes are equal and 3 time units; at this time, in order to ensure that the uplink HARQ process 0 receives the corresponding reception state before retransmitting the uplink data, the latest feedback time unit of the uplink HARQ process 0 is the 4 th time unit, and the 4 th time unit is located after the first time unit, or the 4 th time unit is the first time unit. Similarly, the latest feedback time unit of the uplink HARQ process 1 is the 5th time unit, and the 5th time unit is located after the first time unit, or the 5th time unit is the first time unit; the latest feedback time unit of the uplink HARQ process 3 is the 6 th time unit, and the 6 th time unit is located after the first time unit, or the 6 th time unit is the first time unit.

The time ranges are described below according to the relationship between the sub-time ranges and the time ranges.

1. The time starting point of the time range is a time unit corresponding to the second HARQ process meeting the preset condition, and the time ending point is a first time unit. The time start of the sub-time range is the same as the time start of the time range and the time end of the sub-time range is the same as or different from the time end of the time range.

Referring to fig. 4K, the time length of the time range is equal to the timing duration of the automatic retransmission timer corresponding to the second HARQ process that meets the preset condition, at this time, the terminal may receive at least the receiving state corresponding to the uplink HARQ process 0 before retransmitting the uplink data corresponding to the uplink HARQ process 0, and optionally, the terminal may also receive the receiving states corresponding to the uplink HARQ processes 1 and 2 before retransmitting the uplink data corresponding to the uplink HARQ process 0.

2. The time starting point of the time range is a time unit corresponding to the second HARQ process meeting the preset condition, and the time ending point is a certain time unit before the first time unit. The time start of the sub-time range is the same as the time start of the time range and the time end of the sub-time range is the same as or different from the time end of the time range.

Referring to fig. 4L, the time range is less than the timing length of the automatic retransmission timer corresponding to the second HARQ process that meets the preset condition, at this time, the terminal may receive the receiving state corresponding to at least the uplink HARQ process 0 before retransmitting the uplink data corresponding to the uplink HARQ process 0, and optionally, the terminal may also receive the receiving state corresponding to the uplink HARQ process 1 before retransmitting the uplink data corresponding to the uplink HARQ process 0.

3. The time starting point of the time range is a time unit before a time unit corresponding to the second HARQ process meeting the preset condition, and the time ending point is a first time unit. The time start of the sub-time range is different from the time start of the time range and the time end of the sub-time range is the same as or different from the time end of the time range.

Referring to fig. 4M, a sub-time range in the time range is smaller than the timing duration of the automatic retransmission timer corresponding to the second HARQ process that meets the preset condition, and the terminal may receive the reception state corresponding to at least the uplink HARQ process 0 before retransmitting the uplink data corresponding to the uplink HARQ process 0, and optionally, the terminal may also receive the reception states corresponding to the uplink HARQ processes 1 and 2 before retransmitting the uplink data corresponding to the uplink HARQ process 0.

4. The time starting point of the time range is a time unit before a time unit corresponding to the second HARQ process meeting the preset condition, and the time ending point is a time unit before the first time unit. In this case, the time start point of the sub-time range is different from the time start point of the time range, and the time end point of the sub-time range is the same as or different from the time end point of the time range.

Referring to fig. 4N, a sub-time range in the time range is smaller than the timing duration of the automatic retransmission timer corresponding to the second HARQ process that meets the preset condition, at this time, the terminal may receive at least the receiving state corresponding to the uplink HARQ process 0 before retransmitting the uplink data corresponding to the uplink HARQ process 0, and optionally, the terminal may also receive the receiving state corresponding to the uplink HARQ process 1 before retransmitting the uplink data corresponding to the uplink HARQ process 0.

Schematically, in fig. 4O, after the terminal sends uplink data through the uplink HARQ process with the HARQ process number of 0 in the 1 st time unit, after waiting for 1 time unit, the terminal starts the automatic retransmission timer corresponding to the uplink HARQ process with the HARQ process number of 0, that is, the starting time of the automatic retransmission timer is located in the 3 rd time unit, and the equal timing durations of the automatic retransmission timers corresponding to the uplink HARQ processes are all 3 time units; at this time, in order to ensure that the uplink HARQ process with HARQ process number 0 receives the corresponding reception state before retransmitting uplink data, the time unit fed back latest by the uplink HARQ process with HARQ process number 0 is the 5th time unit, and the 5th time unit is located after the first time unit, or the 5th time unit is the first time unit. Similarly, the latest feedback time unit of the uplink HARQ process with the HARQ process number 1 is the 6 th time unit, the 6 th time unit is located after the first time unit, or the 6 th time unit is the first time unit; the latest feedback time unit of the uplink HARQ process with HARQ process number 2 is the 7 th time unit, and the 7 th time unit is located after the first time unit, or the 7 th time unit is the first time unit.

In this scenario, the relationship between the time length of the time range and the timing duration of the automatic repeat request timer is shown in fig. 4K to 4N, where the starting time of the automatic repeat request timer in fig. 4K to 4N is shifted backward by one time unit.

Optionally, in the present application, the preset condition is at least one of the following conditions:

and the timing duration of the corresponding automatic retransmission timer is greater than the second HARQ process with the preset length.

Illustratively, when the timing durations of the automatic retransmission timers corresponding to the uplink HARQ processes are equal, the second HARQ process corresponding to the time unit that is the earliest time unit in the time domain among the n time units in the n second HARQ processes is the second HARQ process that satisfies the preset condition. Since the access network device includes the receiving states of the n second HARQ processes in the second feedback information sent by the first time unit, in order to ensure validity of the feedback receiving states, the time position of the first time unit in time is no later than the earliest time unit of the n automatic retransmission time units corresponding to the n second HARQ processes. Because the timing durations of the automatic retransmission timers corresponding to the uplink HARQ processes are equal, the second HARQ process that satisfies the preset condition is the second HARQ process corresponding to the earliest time unit in the time domain among the n time units.

Illustratively, when the timing durations of the automatic retransmission timers corresponding to the uplink HARQ processes are not equal, the second HARQ process that retransmits the uplink data earliest in the n second HARQ processes is the second HARQ process that satisfies the preset condition. The second HARQ process for earliest uplink data transmission refers to: and in the n HARQ processes, after the timing duration of one automatic retransmission timer, automatically retransmitting the second HARQ process of the uplink data at the earliest time.

Illustratively, when the timing duration of the automatic retransmission timer corresponding to f second HARQ processes is smaller than or equal to the preset length and the value of f/n is smaller than the preset threshold value in the n second HARQ processes, the terminal determines, as the second HARQ process meeting the preset condition, the second HARQ process of the n second HARQ processes whose timing duration of the corresponding automatic retransmission timer is greater than the preset length.

Illustratively, n HARQ processes, after going through the timing duration of the respective corresponding automatic retransmission timer, will correspond to q automatic retransmission time units, where q is less than or equal to n. If the corresponding automatic retransmission time units are different after each HARQ process in the n HARQ processes experiences the timing duration of the corresponding automatic retransmission timer, q is equal to n; or, if, in the n HARQ processes, after at least two HARQ processes experience the timing duration of the respective corresponding automatic retransmission timer, the corresponding automatic retransmission time units are the same, q is smaller than n.

In order to ensure the validity of the receiving states of n HARQ processes fed back by the access network equipment, the first time unit is located before a preset time unit on a time domain; or, the first time unit is a preset time unit. Wherein, the position of the preset time unit on the time domain satisfies the following characteristics: and the automatic retransmission time unit corresponding to the e HARQ processes in the n HARQ processes is before the preset time unit. Wherein the ratio of e/n is preconfigured; alternatively, e is preconfigured.

In the application, an automatic retransmission time unit is a time unit corresponding to a time duration of an automatic retransmission timer after a terminal has finished transmitting data through an HARQ process. Schematically, in fig. 4J, the automatic retransmission time unit with HARQ process number 0 is the 5th time unit.

When the terminal performs uplink data transmission based on the UL grant free, the distribution of the used time resources over time may be preconfigured, for example, may occur periodically. If the period is not equal to 1, the time unit for the terminal to perform uplink data transmission based on the UL grant free is discontinuous. On the other hand, when the feedback information sent by the access network device includes time indication information, in order to simplify the design, the time indication information may correspond to a continuous time range, and at this time, the terminal may correspond the HARQ process corresponding to the time unit for uplink data transmission of the UL grant free included in the time range to the reception state in the feedback information of the access network device.

It should be noted that, in the present application, the time length of the time unit on the terminal side may be the same as or different from the time length of the time unit on the access network device side. If not, the terminal may understand the time range indicated by the time indication information in the second feedback information according to the length of the local time unit.

Optionally, for each uplink HARQ process for which the access network device has fed back the reception state to the terminal, if the access network device determines that the uplink HARQ process is continuously used for transmitting uplink data between the current feedback and the next feedback before the access network device feeds back the reception state corresponding to the uplink HARQ process for the next time, after the access network device feeds back the reception state corresponding to the uplink HARQ process for the current time, the reception state corresponding to the uplink HARQ process may be set to be the default reception state, for example: NACK. And if the access network equipment determines that the receiving state corresponding to the uplink HARQ process is the acknowledgement receiving state ACK when feeding back the receiving state corresponding to the uplink HARQ process for the next time, modifying (replacing) the default receiving state (namely NACK) corresponding to the uplink HARQ process into ACK.

In this embodiment, after the receiving state corresponding to the uplink HARQ process is fed back this time, the access network device sets the receiving state corresponding to the uplink HARQ process as the default receiving state, so that the situation of packet loss can be avoided.

Referring to fig. 5, a schematic diagram of the access network device feeding back the default reception status is shown. Suppose that the terminal sends the first uplink data 502 through the uplink HARQ process corresponding to HPN #2 in the 1 st time unit 501, and receives the feedback information 504 sent by the access network device in the 3 rd time unit 503, where the feedback information 504 indicates that the receiving status corresponding to the first uplink data 502 is ACK.

After receiving the feedback information 504, the terminal continues to transmit the second uplink data 506 through the uplink HARQ process corresponding to HPN #2 at the 5th time unit 505. The terminal receives feedback information 507 sent by the access network device at a 7 th time unit 508, where the feedback information 507 indicates a receiving state corresponding to the second uplink data 506.

In one case, the access network device does not set the reception status corresponding to HPN #2 as NACK after transmitting the feedback information 504. At this time, if the access network device fails to detect the second uplink data 506 (i.e., does not detect the second uplink data 506), the reception status corresponding to HPN #2 indicated by the feedback information 507 is still ACK. In this case, the terminal may misunderstand that the second uplink data 506 is correctly received by the access network device, so that the second uplink data 506 is discarded, that is, a packet loss situation of the uplink service occurs.

In this embodiment, after sending the feedback information 504, the access network device sets the reception status corresponding to HPN #2 as NACK. At this time, if the access network device misses detecting the second uplink data 506, the reception state corresponding to HPN #2 indicated by the feedback information 507 is NACK. In this case, the terminal determines that the second uplink data 506 is not correctly received by the access network device, so as to retransmit the second uplink data 506, thereby avoiding a packet loss situation of the uplink service.

In addition, in this embodiment, if the access network device correctly receives the second uplink data 506, the NACK is modified to be ACK, and the feedback information 507 is sent to the terminal at the 7 th time unit 508, where the feedback information 507 is used to indicate that the receiving status of the second uplink data 506 is ACK, and accordingly, the terminal receives the feedback information 507 at the 7 th time unit 508.

In fig. 5, the 3 rd time unit 503 can be regarded as the time unit of the "feedback this time", and the 7 th time unit 508 can be regarded as the time unit of the "feedback next time".

Optionally, for each uplink HARQ process for which the access network device has fed back the reception state to the terminal, if the access network device determines that the terminal does not transmit uplink data in the uplink HARQ process between the current feedback and the next feedback before feeding back the reception state corresponding to the uplink HARQ process for the next time, the access network device may repeat transmitting the reception state corresponding to the uplink HARQ process.

Referring to fig. 6, a schematic diagram of a receiving state corresponding to the repeated transmission of the uplink HARQ process by the access network device is shown. It is assumed that the terminal sends the first uplink data 602 through the uplink HARQ process corresponding to HPN #2 in the 1 st time unit 601, and receives the feedback information 604 sent by the access network device in the 3 rd time unit 603, where the feedback information 604 indicates that the receiving state of the first uplink data 602 is ACK.

On the access network device side, the time units included from the 3 rd time unit 603 to the 5th time unit 605 are all downlink time units (time units for downlink data transmission). If the access network device still feeds back the receiving status corresponding to HPN #2 at the 5th time unit 605, the feedback information 606 sent by the access network device at the 5th time unit indicates that the receiving status corresponding to HPN #2 is ACK. At this time, since there is no uplink time unit (time unit for uplink data transmission) between the 3 rd time unit 603 (time unit corresponding to "feedback this time") and the 5th time unit 605 (time unit corresponding to "feedback next time"), the access network device may continue to repeat feedback on the reception state of the HPN #2 without considering that the reception state corresponding to the HPN #2 is changed to the default reception state after the feedback of the 3 rd time unit 603. This can improve the reliability of feedback information transmission.

The access network device determines whether the terminal continuously transmits uplink data by using the uplink HARQ process corresponding to the reception state fed back this time, which is not limited in this embodiment.

Illustratively, the access network device determines whether the terminal continues to transmit the uplink data by using the uplink HARQ process corresponding to the reception state fed back this time according to the number of the remaining uplink data to be transmitted by the terminal. Or, if the access network device determines that there is no uplink time unit for the terminal device to transmit uplink data between the time unit corresponding to the current feedback receiving state and the time unit corresponding to the next feedback receiving state, the access network device may determine that the terminal device does not continue to transmit uplink data using the uplink HARQ process corresponding to the current feedback receiving state between the time units corresponding to the two feedback receiving states; on the contrary, if the access network device determines that there is an uplink time unit for the terminal device to transmit uplink data between the time unit corresponding to the current feedback receiving state and the time unit corresponding to the next feedback receiving state, the access network device may determine that the terminal device may continue to transmit uplink data using the uplink HARQ process corresponding to the current feedback receiving state between the time units corresponding to the two feedback receiving states. Or, if the data transmitted by the uplink HARQ process corresponding to the reception state fed back this time is scheduled based on the access network device, the access network device may determine that, within the time unit range in which the uplink HARQ process is continuously scheduled twice, the terminal does not continue to transmit the uplink data using the uplink HARQ process corresponding to the reception state fed back this time.

The relevant features of the first feedback information are described in detail below.

Optionally, the first feedback information is used for scheduling m second HARQ processes of the n second HARQ processes to send uplink data, except for scheduling first uplink data corresponding to the first HARQ process, where m is greater than or equal to 1 and is less than or equal to n, and m is an integer.

In a first implementation, s ═ m, the first feedback information is also used for scheduling the terminal to retransmit corresponding other uplink data through s second HARQ processes.

In this way, before the access network device receives the first uplink data and sends the feedback information to the terminal, it determines that the reception states of the s second HARQ processes are the non-acknowledged reception state NACK, and indicates, through the first feedback information, resources required for retransmitting the corresponding other uplink data.

It should be added that, in the embodiment of the present invention, the reception statuses of the s second HARQ processes are valid NACKs.

Wherein, valid NACK means: when the default receiving state is NACK, NACKs except the default receiving state NACK, that is, NACKs corresponding to the second HARQ processes set when the access network device is not in time to process part of the second HARQ processes due to the processing delay.

For example, in fig. 4F, NACKs corresponding to HPN #6 and HPN #7 are not valid NACKs, i.e., the first feedback information is not used for scheduling other upstream data corresponding to HPN #6 and HPN # 7.

In a second implementation, s is greater than 0 and less than m, and the first feedback information is used for the scheduling terminal to retransmit corresponding other uplink data through s second HARQ processes, and is also used for the scheduling terminal to initially transmit corresponding other uplink data through m-s second HARQ processes.

In this way, before the access network device receives the first uplink data and sends the feedback information to the terminal, it determines that the reception state of the s second HARQ processes is the non-acknowledged reception state NACK, and indicates, through the first feedback information, resources required for retransmitting the corresponding other uplink data; and determining the receiving states of the m-s second HARQ processes as ACK (acknowledgement) receiving states, and indicating resources required by other uplink data corresponding to initial transmission through the first feedback information.

Such as: in fig. 4F, HPN #0 and HPN #2-HPN #5 are process numbers corresponding to the second HARQ process, the access network device determines that the reception state of other uplink data corresponding to HPN #0 is an acknowledged reception state ACK, and the reception state of other uplink data corresponding to HPN #2-HPN #5 is an unacknowledged reception state NACK, so that the first feedback information is used for the scheduling terminal to retransmit other uplink data corresponding to HPN #2-HPN # 5; and is also used for scheduling other uplink data corresponding to the terminal initial transmission HPN # 0.

In the third implementation, s is greater than or equal to 0 and less than m, and the first feedback information is used for scheduling other uplink data corresponding to the terminal through m-s second HARQ processes.

In this way, before the access network device receives the first uplink data and sends the feedback information to the terminal, it determines the receiving states of the m-s second HARQ processes as ACK, and indicates the resources required for initially transmitting the corresponding other uplink data through the first feedback information.

Such as: in fig. 4F, HPN #0 and HPN #2-HPN #5 are process numbers corresponding to the second HARQ process, and the access network device determines that the reception state of other uplink data corresponding to HPN #0 is the reception acknowledgement state ACK, so that the first feedback information is used for scheduling the terminal to initially transmit other uplink data corresponding to HPN # 0.

It should be added that, in the above three implementation manners, the values of s are all integers.

Optionally, in the three implementation manners, when the value of m is smaller than n, the first feedback information may not include scheduling information corresponding to all uplink HARQ processes in the second feedback information.

Referring to fig. 7, the feedback information generated by the access network device is composed of two parts: DCIgroup 1 (second feedback information) and DCI group 2 (first feedback information). The DCI group 1 is used for indicating the receiving states corresponding to the n +1 uplink HARQ processes; the DCI group 2 is used for scheduling uplink data sent by the terminal through the uplink HARQ processes HPN # i to HPN # j, wherein the uplink data includes uplink data sent by the first HARQ process. i and j are not equal and are both integers.

Optionally, in the embodiment of the present invention, in order to reduce the complexity of the terminal for blind detection of the feedback information, the access network device configures the state of the first feedback information.

Wherein the state of the first feedback information comprises: including only scheduling information for the first HARQ process, scheduling information for at least two uplink HARQ processes (the at least two uplink HARQ processes including the first HARQ process).

When the number of the uplink HARQ processes acted by the first feedback information is different, the size of the first feedback information is also different, so in order to reduce the problem that the blind detection complexity of the terminal is improved due to the different size of the first feedback information, in one implementation, the size of the corresponding first feedback information is the same no matter what the number of the uplink HARQ processes acted by the first feedback information is; in another implementation, the access network device configures, in a high-level configuration manner, whether the first feedback information is for the first HARQ process or for the multiple uplink HARQ processes, and at this time, the access network device may also configure the number of the multiple uplink HARQ processes.

In this embodiment of the present invention, the first feedback information includes time domain resource configuration information and/or frequency domain resource configuration information.

The time domain resource configuration information at least includes: a size of the time domain resource and/or a location of the time domain resource.

The frequency domain resource configuration information at least includes: a size of the frequency domain resources and/or a location of the frequency domain resources.

Assuming that the receiving state corresponding to the first uplink data is an ACK receiving state, the first feedback information may be at least used for the terminal to initially transmit the second uplink data by using the first HARQ process.

Assuming that the receiving status corresponding to the first uplink data is a non-acknowledged receiving status NACK, the first feedback information may be at least used for the terminal to retransmit the first uplink data using the first HARQ process.

Optionally, the first feedback information may further include other control information for indicating uplink scheduling transmission, for example: modulation and Coding Scheme (MCS), Transmission Power Control (TPC), signature information required for uplink data retransmission, and the like, which are not limited in this embodiment.

Optionally, when the first feedback is used to schedule the terminal to send the uplink data through the second HARQ process in addition to the first HARQ process, the frequency domain resource where the terminal sends the uplink data through the first HARQ process may be the same as or different from the frequency domain resource where the terminal sends the uplink data through the second HARQ process, where the frequency domain resource includes the size of the frequency domain resource and/or the position of the frequency domain resource.

When the frequency domain resource of the terminal for sending the uplink data through the first HARQ process is different from the frequency domain resource of the terminal for sending the uplink data through the second HARQ process, the frequency domain resource corresponding to the first HARQ process and the frequency domain resource corresponding to the second HARQ process may have a predefined or preconfigured relationship, or the relationship between the two may also be notified through dynamic signaling. The preconfigured relationship may be implemented by Radio Resource Control (RRC) signaling, or other manners, which is not specifically limited.

Similarly, the same description is given for the relationship between the time domain resource for the terminal to transmit the uplink data through the first HARQ process and the time domain resource for the terminal to transmit the uplink data through the second HARQ process.

Optionally, in this embodiment of the present invention, the feedback information is terminal-specific control information, and may be scrambled by using a terminal-specific C-RNTI, where the first feedback information and the second feedback information in the feedback information are carried in the same downlink channel, that is, the access network device sends the first feedback information and the second feedback information in the feedback information through the downlink channel.

Optionally, the Downlink Channel is a Physical Downlink Control Channel (PDCCH); or, an Enhanced Physical Downlink Control Channel (EPDCCH); or, a Physical Downlink Shared Channel (PDSCH); alternatively, the downlink channel in the 5G system is not limited in this embodiment.

Optionally, based on the above embodiments, the access network device may configure whether the terminal receives the feedback information. Referring to fig. 8, a flowchart of a feedback information transmission method according to another exemplary embodiment of the present application is shown, where the method is used in the mobile communication system shown in fig. 1. Before step 402, the method comprises the following further steps.

Step 801, the access network device sends configuration information to the terminal.

The configuration information is used for indicating the terminal to receive the first feedback information and the second feedback information on the same downlink channel. That is, the access network device combines the first feedback information and the second feedback information to generate the feedback information.

Optionally, the configuration information is configured through Radio Resource Control (RRC) signaling; or, configured through physical layer signaling; or, the MAC signaling configuration is used, which is not limited in this embodiment.

Step 802, the terminal receives configuration information.

And the terminal determines to receive the feedback information through the downlink information according to the configuration information.

Optionally, when the configuration information is used to instruct the terminal to receive the first feedback information and the second feedback information on different downlink channels, the terminal receives the first feedback information and the second feedback information on two independent downlink channels, respectively.

In summary, in the feedback information transmission method provided in this embodiment, the access network device sends the configuration information to the terminal, so that the terminal determines whether to receive the first feedback information and the second feedback information in the feedback information through the same downlink channel, and a receiving manner of dynamically configuring the feedback information by the access network device is implemented.

In this embodiment, by dynamically configuring the receiving mode of the feedback information, the number of times of blind detection of the UE is reduced as much as possible, and it is guaranteed that too much overhead is not introduced in the same downlink channel as much as possible. For example, when the number of valid information bits included in the second feedback information is smaller than the first threshold, the access network device may design the same downlink channel to include the first feedback information and the second feedback information at the same time, which may save signaling overhead; on the other hand, when the number of effective information bits included in the second feedback information is greater than the first threshold, the access network device may design different downlink channels to respectively include the first feedback information and the second feedback information, so that the downlink channel may be prevented from bearing an excessive load (Payload).

Alternatively, step 801 may be implemented separately as a method embodiment on the access network device side; step 802 may be implemented separately as an embodiment of the method at the terminal side, which is not limited in this embodiment.

Alternatively, the access network device may not send the configuration information to the terminal. At this time, the terminal implicitly determines whether to receive the first feedback information and the second feedback information through one downlink channel or receive the first feedback information and the second feedback information through two independent downlink channels.

Illustratively, when the number of effective information bits included in the second feedback information is smaller than the first threshold, the terminal determines to receive the first feedback information and the second feedback information through one downlink channel, so that the access network device does not need to send configuration information to the terminal, thereby saving the overhead of the downlink channel. On the contrary, when the number of effective information bits included in the second feedback information is greater than or equal to the first threshold, the terminal determines to receive the first feedback information and the second feedback information through two independent downlink channels.

Optionally, when the time domain resource and/or the frequency domain resource used in the uplink data transmission process described in the foregoing embodiments belong to an unlicensed frequency band, the frequency bands in which the first time unit, the second time unit, and the third time unit are located are the unlicensed frequency bands, and the first time unit and the second time unit are time units included in an uplink duration (UL duration) in a single TxOP. The third time unit may belong to the sub TxOP or may not belong to the sub TxOP, which is not limited in this embodiment.

In this embodiment, the UL duration may be preconfigured, may also be dynamically notified by the access network device, or may also be dynamically notified to the access network device by the terminal, which is not limited in this embodiment of the present invention.

Optionally, the UL duration is configured by the access network device by sending Radio Resource Control (RRC) signaling to the terminal.

Optionally, the UL duration is configured by the access network device transmitting a Common Control information indication to the terminal on a Common Physical Downlink Control Channel (C-PDCCH) on the unlicensed frequency band. At this time, the terminal determines the UL duration through the common control information indication on the unlicensed band. Wherein, the common control information may indicate an end position of the downlink burst data transmission. Referring to fig. 9A, the UL duration notified by the C-PDCCH includes a third time unit 92, and the UL duration and the downlink TTI94 where the C-PDCCH is located belong to the same TxOP 96.

Optionally, the terminal may send uplink data to the access network device in a third time unit through the UL grant free; the uplink data may also be sent to the access network device in the third time unit through the UL grant, which is not limited in this application.

Optionally, the resources for UL grant free transmission mentioned in the above embodiments include at least one of: time resources used by uplink data transmitted based on the UL grant free, frequency resources used by the uplink data transmitted based on the UL grant free, and signature information used by the uplink data transmitted based on the UL grant free. Wherein the signature information comprises at least one of: a codebook, a codeword, a sequence, an interleaving pattern, a mapping pattern, a Demodulation Reference Signal (DMRS), a Preamble (Preamble), spatial dimension information, and power dimension information. Or, more generally, the resource for UL grant free transmission includes any resource corresponding to uplink data transmitted based on the UL grant free, where the resource includes a time resource, a frequency resource, a spatial domain resource, a code domain resource, power information, and resources (e.g., a reference signal for assisting time-frequency synchronization, a preamble sequence, etc.) required for assisting uplink data demodulation.

Optionally, the signature information required for retransmitting the uplink data mentioned in the above embodiments may include at least one of: MCS, DMRS related control information (which may include, illustratively, Cyclic Shift (CS) and Orthogonal Cover Code (OCC)), codebook, codeword, sequence, interleaving pattern, mapping pattern, Demodulation Reference Signal (DMRS), Preamble, spatial dimension information, power dimension information. Or, more generally, the signature information required for retransmitting the uplink data includes any resource corresponding to the retransmitted uplink data, where the resource includes one or more of a resource in time, a resource in frequency, a resource in spatial domain, a resource in code domain, power information, and a resource required for assisting demodulation of the retransmitted uplink data, such as a demodulation reference signal, a reference signal for assisting time-frequency synchronization, and a preamble sequence.

Optionally, the uplink data sent by the terminal mentioned in the foregoing embodiments includes, for example: the uplink data sent by the terminal in the second time unit may correspond to 1 Transport Block (TB) or 1 Code Block (CB), or may correspond to multiple TBs or multiple CBs, and is not limited specifically herein.

Optionally, the receiving status mentioned in the above embodiments may include DTX in addition to ACK and/or NACK. When the receiving status includes ACK, NACK, DTX, and when the receiving status is indicated in a bitmap form, 2 bits may be used to indicate the receiving status corresponding to each HARQ process.

Optionally, the reception states of the n second HARQ processes mentioned in the above embodiments include: and the terminal sends the receiving state of other uplink data through the second HARQ process, and/or the terminal does not send the default receiving state of other uplink data through the second HARQ process. When the terminal sends other uplink data through the second HARQ process, but due to data reception processing delay and other problems, the access network device cannot feed back the reception state of the other uplink data sent by the second HARQ process when sending the second feedback information, and may use the default reception state to feed back the other uplink data corresponding to the second HARQ process.

Optionally, in each of the above embodiments, the first feedback information and the second feedback information may be carried in a UL grant, where the UL grant is Downlink Control Information (DCI) for scheduling uplink data transmission. Taking LTE system as an example, the UL grant may be transmitted through a downlink control channel with formats of DCI format 0, DCI format4, DCI format 0A, DCI format 0B, DCI format 4A, and DCI format 4B, or may be understood as: all downlink control information transmitted on downlink control channels of DCI format 0, DCI format4, DCI format 0A, DCI format 0B, DCI format 4A, and DCI format 4B may be regarded as ul grant. To simplify the design, the second feedback information may multiplex some redundant bits in the UL grant to indicate n second HARQ processes; or the reception states of the n second HARQ processes and the first HARQ process. For example, when some field information included in the UL grant is semi-statically configured, the field information may be used to indicate the reception status; for another example, the frequency resource indication information in the UL grant may be used to indicate the reception status. Or, an extra bit may be added to the existing UL grant to indicate n second HARQ processes, or the reception states of the n second HARQ processes and the first HARQ process. Optionally, in order to reduce the UE blind detection complexity, a specific bit or bits may be used in the UL grant after the additional bit is added to indicate whether the UL grant after the additional bit is currently added is only used for scheduling uplink data (e.g., only includes the first feedback information), or is used for scheduling uplink data and includes the second feedback information. Further, the specific bit or bits are also used to indicate that the UL grant after adding the additional bits includes only the second feedback information.

Optionally, in the foregoing embodiments, the terminal detects feedback information in the first downlink channel (e.g., detects the feedback information through the UL grant), and further, the terminal may determine a status of the feedback information according to indication information included in the feedback information (e.g., through indication information included in the UL grant), where the status of the feedback information includes at least one of: the feedback information comprises first feedback information and second feedback information; the feedback information only includes the first feedback information (for example, the feedback information only includes scheduling information for uplink data transmission, and does not include the reception state of the second HARQ process indicated by bitmap or other forms); the feedback information includes only the second feedback information (e.g., only the reception status of the second HARQ process indicated in bitmap or other form).

Optionally, in the foregoing embodiments, the terminal may detect the feedback information in the second downlink channel (e.g., detect the feedback information through the UL grant), and further, the terminal may determine the state of the feedback information according to the indication information included in the feedback information (e.g., through the indication information included in the UL grant), where the state of the feedback information may include only: the feedback information includes first feedback information and second feedback information, and the feedback information includes only the first feedback information. This is particularly useful when the first feedback information uses a larger number of bits, which would result in a larger number of redundant bits in the UL grant if the feedback information included only the second feedback information. In this case, the terminal may detect, in the third downlink channel, Control information including the second feedback information, for example, the Control information includes only a reception state of the second HARQ process indicated by bitmap or in another form, and for example, the Control information includes not only the reception state of the second HARQ process indicated by bitmap or in another form, but also some other Control information, such as Transmit Power Control (TPC) information, MCS information, and the like, but not time domain resource configuration information and/or frequency domain resource configuration information. The transmission format used by the downlink control information transmitted in the second downlink channel is different from the transmission format used by the downlink control information transmitted in the third downlink channel. That is, the terminal needs to perform blind detection at least twice to detect the feedback information carried in the second downlink channel and the control information including the second feedback information carried in the third downlink channel.

The above description also applies to a 5G communication system, and although DCI format carrying uplink control information may be different from that of the LTE system, it is applicable to design of UL grant in the 5G system.

Optionally, after the terminal sends uplink data to the access network device through the HARQ process, the access network device may only feed back the receiving state corresponding to the HARQ process and the corresponding time indication information to the terminal.

Referring to fig. 9B, a flowchart of a feedback information transmission method provided by an exemplary embodiment of the present application is shown, and the method is used in the mobile communication system shown in fig. 1. The method comprises the following steps.

In step 901, the terminal sends uplink data through n HARQ processes in n time units.

Each time unit corresponds to one HARQ process, and the terminal transmits uplink data through the corresponding HARQ process in each time unit.

Step 902, the access network device receives uplink data sent by the terminal through n HARQ processes in n time units.

Each time unit corresponds to one HARQ process, and the access network device receives uplink data sent by the corresponding HARQ process in each time unit.

The n time units on the access network equipment side correspond to the n time units on the terminal side one by one.

For the related description of this step, refer to step 404, which is not described herein again.

Step 903, the access network device sends the feedback information on the first time unit.

The feedback information comprises the receiving states of the n HARQ progresses and time indication information, the time indication information is used for indicating time units corresponding to the receiving states of the n HARQ progresses, and the n time units are located before the first time unit.

Optionally, in the present application, the time indication information indicates, by a display indication manner, a time unit corresponding to the receiving state of each uplink HARQ process. That is, the feedback information includes information bits corresponding to the time indication information.

The time unit corresponding to the reception state of each uplink HARQ process refers to a time unit for transmitting uplink data through the uplink HARQ process. Such as: the feedback information includes a 3-bit receiving state, where the 3-bit receiving state is a receiving state corresponding to the uplink HARQ process with sequence number 1 in fig. 4H, the time unit corresponding to the receiving state is the j-5 th time unit, the receiving state corresponding to the uplink HARQ process with sequence number 2, the time unit corresponding to the receiving state is the j-3 th time unit, the receiving state corresponding to the uplink HARQ process with sequence number 3, and the time unit corresponding to the receiving state is the j-1 th time unit.

Optionally, the time indication information in the feedback information indicates a time range corresponding to n time units.

Optionally, in this application, the time starting point of the time range may be a starting boundary of a certain time unit included in the time range, and the time ending point of the time range may be an ending boundary of a certain time unit included in the time range, and for convenience of description, in the embodiment of the present invention, the description may be simplified as follows: the time start or time end of a time range may be a certain time unit comprised by the time range. For example, in the present application, the following two descriptions are equivalent. One description is: the time starting point of the time range is the starting boundary of the earliest time unit included in the time range, and the time ending point of the time range is the ending boundary of the latest time unit included in the time range; another equivalent description is: the time start of a time range is the earliest time unit in time that the time range includes, and the time end of the time range is the latest time unit in time that the time range includes. The above-described equivalent descriptions also apply to the case where the time start and the time end of a time range are other time units included in the time range.

Alternatively, in each representation form of the time indication information, the number of bits for ensuring the receiving state in the feedback information is associated with the time length of the time range indicated by the time indication information. The bit number of the receiving state in the second feedback information is associated with the time length of the time range indicated by the time indication information, so that the terminal can directly determine the corresponding relation between the receiving state and the time unit, and the signaling overhead of the access network equipment is saved.

Optionally, the bit number of the receiving status in the feedback information may also not be associated with the time length of the time range indicated by the time indication information, referring to fig. 4I, the bit number of the receiving status in the second feedback information is 5bits, and the time range indicated by the time indication information includes 7 time units for uplink data transmission. At this time, the terminal cannot directly determine the corresponding relationship between the 7 time units and the 5bit receiving state, and the access network device needs to send an additional signaling to the terminal to inform the terminal of the manner of determining the corresponding relationship between the time units and the receiving state; or, the terminal may determine the corresponding relationship between the time unit and the receiving state time according to a preset rule. For example, referring to fig. 4I, the preset rule may be that the receiving status in the two pieces of feedback information corresponds to a time unit that is included in the time range indicated by the time indication information and is earlier in the time domain position, for example, in this example, 5bits correspond to time units labeled 1 to 5, respectively.

Optionally, in this application, the time starting point of the time range is the earliest time unit in the time domain among the n time units, such as: in fig. 4H, the time start point of the time range is time unit (# j-5). Therefore, the terminal does not need to detect whether the time unit before the time starting point is the time unit for uplink data transmission, and resources of the terminal are saved.

Optionally, in this application, the time end point of the time range is a time unit that is latest in the time domain among the n time units. Such as: in fig. 4H, the time end point of the time range is a time unit (# j-1). Therefore, the terminal does not need to detect whether the time unit after the time end is the time unit for uplink data transmission, and resources of the terminal are saved.

For the transmission of uplink data in a UL grant free scene, since the terminal is configured with the automatic retransmission timer, after the terminal sends the uplink data through the uplink HARQ process, in order to ensure that the terminal can receive a receiving state corresponding to the uplink data before automatically retransmitting the uplink data, that is, to ensure the validity of the receiving state received by the terminal, in the present application, the time range includes a sub-time range, the time length of the sub-time range is less than or equal to the retransmission waiting duration, and the retransmission waiting duration includes the timing duration of the automatic retransmission timer. The starting time point of the sub-time range is a time unit corresponding to a HARQ process meeting a preset condition among the n HARQ processes, and the ending time point of the sub-time range is a first time unit or a time unit before the first time unit. The HARQ process satisfying the preset condition is an HARQ process that performs automatic retransmission earliest in a time domain among the n HARQ processes. Because the time starting point of the sub-time range in the time range is the time unit corresponding to the HARQ process meeting the preset condition, and the time length of the sub-time range is less than the timing duration of the automatic retransmission timer corresponding to the HARQ process meeting the preset condition, it is ensured that the receiving state of the uplink data is received before the terminal automatically retransmits the uplink data corresponding to the HARQ process meeting the preset condition, and the validity of the receiving state is ensured.

1. The time starting point of the time range is a time unit corresponding to the HARQ process meeting the preset condition, and the time ending point is a first time unit. The time start of the sub-time range is the same as the time start of the time range and the time end of the sub-time range is the same as or different from the time end of the time range.

2. The time starting point of the time range is a time unit corresponding to the HARQ process meeting the preset condition, and the time ending point is a certain time unit before the first time unit. The time start of the sub-time range is the same as the time start of the time range and the time end of the sub-time range is the same as or different from the time end of the time range.

3. The time starting point of the time range is a time unit before a time unit corresponding to the HARQ process meeting the preset condition, and the time ending point is a first time unit. The time start of the sub-time range is different from the time start of the time range and the time end of the sub-time range is the same as or different from the time end of the time range.

4. The time starting point of the time range is a time unit before a time unit corresponding to the second HARQ process meeting the preset condition, and the time ending point is a time unit before the first time unit. The time start of the sub-time range is different from the time start of the time range and the time end of the sub-time range is the same as or different from the time end of the time range.

Optionally, in the present application, the preset condition is at least one of the following conditions: the corresponding time unit is the HARQ process of the earliest time unit in the time domain in the n time units; the HARQ process with the shortest timing duration of the corresponding automatic retransmission timer; and the timing duration of the corresponding automatic retransmission timer is greater than the HARQ process with the preset length.

Illustratively, when the timing durations of the automatic retransmission timers corresponding to the uplink HARQ processes are equal, the terminal determines, as the HARQ process satisfying the preset condition, the HARQ process whose corresponding time unit is the earliest time unit in the time domain among the n HARQ processes.

Illustratively, when the timing durations of the automatic retransmission timers corresponding to the uplink HARQ processes are not equal, the terminal determines, as the HARQ process satisfying the preset condition, the HARQ process with the shortest timing duration of the corresponding automatic retransmission timer among the n HARQ processes.

Illustratively, when the timing duration of an automatic retransmission timer corresponding to f HARQ processes is smaller than or equal to a preset length and the value of f/n is smaller than a preset threshold value in n HARQ processes, the terminal determines, as an HARQ process meeting a preset condition, an HARQ process of the n HARQ processes whose timing duration of the corresponding automatic retransmission timer is greater than the preset length.

In step 904, the terminal receives feedback information over a first time unit.

The related description of this embodiment refers to the corresponding descriptions of fig. 4G to fig. 4N in the above method embodiments, which are not repeated herein.

In summary, in this embodiment, the feedback information carries the receiving states and the time indication information of the n HARQ processes, so that the terminal can determine the HARQ process corresponding to the receiving state according to the time indication information, and the access network device does not need to send an additional signaling to notify the terminal of the corresponding relationship between the receiving states and the HARQ processes, thereby saving the signaling overhead of the access network device.

Alternatively, steps 901 and 904 may be implemented separately as a feedback information receiving method on the terminal side; steps 902 and 903 may be implemented separately as a feedback information sending method on the access network device side, which is not limited in this embodiment.

Optionally, in this application, the feedback information generated by the access network device includes the receiving states corresponding to the n HARQ processes. In order to ensure that the terminal can determine the corresponding relationship between each receiving state and the HARQ process, the application provides two modes of bitmap indication and time unit indication to determine the corresponding relationship between the receiving state and the HARQ process. In practical implementation, the manner of determining the correspondence between the receiving state and the HARQ process is not limited to the two manners provided in the present application. The time length between the time unit corresponding to the HARQ process meeting the preset condition among the n HARQ processes and the first time unit is only required to be ensured to be less than or equal to the retransmission waiting time length.

Referring to fig. 9C, a flowchart of a feedback information transmission method provided by an exemplary embodiment of the present application is shown, and the method is used in the mobile communication system shown in fig. 1. The method comprises the following steps.

Step 910, the terminal sends uplink data through n HARQ processes in n time units, where n is a positive integer.

The related description of this step is detailed in step 901, and this embodiment is not described herein again.

Step 920, the access network device receives uplink data sent by the terminal through n HARQ processes in n time units.

The details of this step are shown in step 902, and this embodiment is not described herein.

In step 930, the access network device sends the feedback information on the first time unit.

Wherein the n time units precede the first time unit.

The feedback information includes reception states of the n HARQ processes. The time length between a time unit corresponding to the HARQ process meeting the preset condition and a first time unit in the n HARQ processes is smaller than or equal to the retransmission waiting time length, the retransmission waiting time length comprises the timing time length of an automatic retransmission timer, the automatic retransmission timer is used for triggering the terminal to retransmit uplink data sent by the HARQ process meeting the preset condition, and the starting time of the automatic retransmission timer is positioned behind the time unit corresponding to the HARQ process meeting the preset condition.

The details of this step are shown in step 903, and this embodiment is not described herein.

In step 940, the terminal receives feedback information on a first time unit.

The related description of this step is shown in step 904, which is not described herein.

In summary, in the feedback information transmission method provided in this embodiment, the validity of the receiving state fed back by the access network device is ensured by setting that the time length between the time unit corresponding to the HARQ process satisfying the preset condition among the n HARQ processes and the first time unit is less than or equal to the retransmission waiting time length.

Referring to fig. 10, a block diagram of a feedback information transmission apparatus according to an embodiment of the present application is shown. The feedback information transmission means may be implemented by software, hardware or a combination of both as all or a part of the terminal 140 or the access network device 120 in the mobile communication system shown in fig. 1. In this embodiment, the terminal 140 is taken as an example of a UE in an LTE system or a 5G system, and the access network device 120 is taken as an eNB in the LTE system or a gNB in the 5G system. The feedback information receiving apparatus may include: a transmitting unit 1010 and a receiving unit 1030.

When the feedback information transmission apparatus is implemented as the terminal 140 in the mobile communication system,

a sending unit 1010, configured to implement the steps 403, 405, 901, and 910 and the sending function of the terminal side implied in each step.

A receiving unit 1020, configured to implement the functions of the above steps 402, 802, 904, and 940 and the implicit receiving function at the terminal side in each step.

The relevant details may be combined with the method embodiments described with reference to fig. 4A, 4D, 8, 9B, and 9C.

Alternatively, the receiving unit 1020 may be implemented by a receiver in the terminal; the transmitting unit 1010 may be implemented by a transmitter in the terminal.

When the feedback information transmission means is implemented as the access network device 120 in the mobile communication system,

a sending unit 1010, configured to implement the steps 401, 801, 903, and 930 and the sending function at the access network device side implied in each step.

A receiving unit 1020, configured to implement the functions of steps 404, 406, 902, and 920 and the receiving function at the access network device side implied in each step.

Alternatively, the receiving unit 1020 may be implemented by a receiver in the access network device; the sending unit 1010 may be implemented by a transmitter in the access network device.

It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the apparatuses and units described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for receiving feedback information, the method comprising:

the terminal receives feedback information on a first time unit, wherein the feedback information comprises first feedback information and second feedback information which are sent through the same downlink channel;

the terminal sends the uplink data through a first hybrid automatic repeat request (HARQ) process on a second time unit according to the first feedback information;

the second feedback information is the receiving states of n second HARQ processes, the second HARQ processes are HARQ processes of the terminal, and n is a positive integer; the second time unit is located after the first time unit.

2. The method of claim 1, wherein before the terminal receives the feedback information over the first time unit, the method further comprises:

the terminal sends first uplink data through the first HARQ process on a third time unit;

the third time unit is located before the first time unit.

3. The method of claim 2, wherein the terminal transmits the uplink data through the first HARQ process in a second time unit according to the first feedback information, and wherein the method comprises:

the terminal retransmits the first uplink data through the first HARQ process on the second time unit according to the first feedback information;

or,

the terminal initially transmits second uplink data through the first HARQ process on the second time unit according to the first feedback information;

wherein the uplink data sent by the first HARQ process includes the first uplink data and/or the second uplink data.

4. The method according to claim 2 or 3, wherein the reception status comprises an acknowledgement reception status ACK and a non-acknowledgement reception status NACK;

the second feedback information is also used for indicating a receiving state corresponding to the first HARQ process;

when the receiving state corresponding to the first HARQ process is the confirmed receiving state, the first feedback information is used to schedule the terminal to initially transmit second uplink data on the second time unit through the first HARQ process;

and when the receiving state corresponding to the first HARQ process is the non-confirmed receiving state, the first feedback information is used for scheduling the terminal to retransmit the first uplink data on the second time unit through the first HARQ process.

5. The method according to any of claims 1 to 4, wherein the reception status of the n second HARQ processes comprises: and the terminal sends the receiving state of other uplink data through the second HARQ process, and/or the terminal does not send the default receiving state of other uplink data through the second HARQ process.

6. The method according to any one of claims 1 to 5,

the maximum value of the uplink HARQ process supported by the terminal is n + 1;

or,

the maximum value of the uplink HARQ process supported by the terminal and used for assisting the transmission of the UL grant free without the uplink scheduling grant is n + 1.

7. The method according to any one of claims 1 to 6,

the first feedback information is also used for scheduling the terminal to send uplink data through m second HARQ processes in the n second HARQ processes, wherein m is more than or equal to 1 and less than or equal to n, and m is an integer.

8. The method of claim 7,

the first feedback information is used for scheduling the terminal to retransmit other corresponding uplink data through s second HARQ processes;

and/or the presence of a gas in the gas,

the first feedback information is used for scheduling the terminal to initially transmit other corresponding uplink data through m-s second HARQ processes;

wherein s is an integer not less than zero, and s is not more than m.

9. The method according to any one of claims 1 to 8, further comprising:

and the terminal receives configuration information, wherein the configuration information is used for indicating the terminal to receive the first feedback information and the second feedback information on the downlink channel.

10. The method according to any of claims 1 to 9, wherein the first feedback information comprises time domain resource configuration information and/or frequency domain resource configuration information.

11. The method according to any of claims 1 to 10, wherein the second feedback information is represented in the form of a bitmap.

12. The method according to any of claims 1 to 11, wherein the second feedback information further comprises time indication information, and the time indication information is used for indicating time units corresponding to the reception statuses of the n second HARQ processes.

13. The method of claim 12, wherein before the terminal receives the feedback information over the first time unit, the method further comprises:

and the terminal sends uplink data through the n second HARQ processes on n time units, wherein the n time units are positioned before the first time unit on the time domain.

14. The method as claimed in claim 12 or 13, wherein the second feedback information is further used for indicating a receiving status corresponding to the first HARQ process, and the time indication information is further used for indicating a time unit corresponding to the receiving status of the first HARQ process.

15. The method according to any of claims 12 to 14, wherein the time indication information indicates a time range including time units corresponding to the reception states of the n second HARQ processes.

16. The method of claim 15,

the time indication information comprises a time starting point and a time ending point of the time range; or,

the time indication information comprises a time length of the time range, a time start or a time end of the time range being preconfigured; or,

the time indication information comprises a time start or a time end of the time range, the time length of the time range being preconfigured.

17. The method of claim 16,

the starting time is the earliest time unit in the time domain among the n time units; and/or the presence of a gas in the gas,

the time end point is a time unit that is latest in a time domain among the n time units; and/or the presence of a gas in the gas,

the time length is a time length between an earliest time unit in a time domain to a latest time unit in the time domain among the n time units.

18. The method according to claim 16 or 17, wherein the length of time is associated with a number of bits corresponding to the reception status of the n second HARQ processes.

19. The method according to any one of claims 12 to 18,

the time range includes a sub-time range, a time start point of the sub-time range is a time unit corresponding to a second HARQ process meeting a preset condition among the n second HARQ processes, a time end point of the sub-time range is a first time unit or a time unit before the first time unit,

the time length of the sub-time range is less than or equal to a retransmission waiting time length, the retransmission waiting time length includes a timing time length of an automatic retransmission timer, the automatic retransmission timer is used for triggering the terminal to retransmit uplink data sent by the HARQ process meeting the preset condition, and the starting time of the automatic retransmission timer is located behind a time unit corresponding to the HARQ process meeting the preset condition.

20. The method of claim 19, wherein the retransmission waiting duration further comprises a feedback delay, and wherein the feedback delay is a duration of an interval between a time when the terminal transmits uplink data through the second HARQ process meeting the preset condition and a time when a receiving status of the second HARQ process meeting the preset condition is received.

21. The method according to claim 19 or 20, wherein the preset condition is at least one of the following conditions:

a second HARQ process, of which a corresponding time unit is the earliest time unit in the time domain among the n time units;

22. The method of any one of claims 12 to 21, wherein n is greater than or equal to 2.

23. A method for receiving feedback information, the method comprising:

a terminal sends uplink data through n hybrid automatic repeat request (HARQ) processes in n time units, wherein n is a positive integer;

the terminal receives feedback information on a first time unit, wherein the feedback information comprises the receiving states of the n HARQ processes and time indication information, the time indication information is used for indicating time units corresponding to the receiving states of the n HARQ processes, and the n time units are positioned before the first time unit.

24. The method of claim 23, wherein the time indication information indicates a time range corresponding to the n time units.

25. The method of claim 24,

26. The method of claim 25,

27. The method according to claim 25 or 26, wherein said length of time is associated with a number of bits corresponding to the reception status of said n HARQ processes.

28. The method of any one of claims 24 to 27,

the time range comprises a sub-time range, the time starting point of the sub-time range is a time unit corresponding to the HARQ process meeting the preset condition in the n HARQ processes, the time ending point of the sub-time range is a first time unit or a time unit before the first time unit,

29. The method of claim 28, wherein the retransmission waiting duration further comprises a feedback delay, wherein the feedback delay is a duration of an interval between a time when the terminal transmits uplink data through the HARQ process satisfying the preset condition and a time when the reception status of the HARQ process satisfying the preset condition is received.

30. The method according to claim 28 or 29, wherein the preset condition is at least one of the following conditions:

the corresponding time unit is the HARQ process of the time unit which is the earliest in the time domain in the n time units;

the HARQ process with the shortest timing duration of the corresponding automatic retransmission timer;

the timing duration of the corresponding automatic retransmission timer is greater than the HARQ process with the preset length;

31. The method of any one of claims 23 to 30, wherein n is greater than or equal to 2.

32. The method according to any of claims 23 to 31, wherein the feedback information comprises first feedback information and second feedback information, the first feedback information is used to instruct the terminal to transmit uplink data through the first HARQ process in the second time unit, and the second feedback information comprises the receiving states of the n HARQ processes and the time indication information.

33. A method for receiving feedback information, the method comprising:

the terminal receives feedback information on a first time unit, wherein the feedback information comprises the receiving states of the n HARQ processes, the time length between a time unit corresponding to the HARQ process meeting the preset condition in the n HARQ processes and the first time unit is less than or equal to retransmission waiting time, the retransmission waiting time comprises the timing time of an automatic retransmission timer, and the automatic retransmission timer is used for triggering the terminal to retransmit uplink data sent by the HARQ process meeting the preset condition.

34. A method for sending feedback information, the method comprising:

the access network equipment sends feedback information on a first time unit, wherein the feedback information comprises first feedback information and second feedback information which are sent through the same downlink channel, and the first feedback information is used for scheduling a terminal to send uplink data through a first HARQ process; the second feedback information is the receiving state of n second HARQ processes, the second HARQ processes are the HARQ processes of the terminal, and n is a positive integer;

the access network equipment receives the uplink data sent by the terminal through the first HARQ process on a second time unit;

the second time unit is located after the first time unit.

35. The method of claim 34, wherein the access network device further comprises, before sending the feedback information on the first time unit:

the access network equipment receives first uplink data sent by the terminal through the first HARQ process in a third time unit;

the third time unit is located before the first time unit.

36. The method of claim 35, wherein the receiving, by the access network device, the uplink data sent by the terminal through the first HARQ process in a second time unit comprises:

the access network equipment receives the first uplink data retransmitted by the terminal through the first HARQ process on the second time unit;

or,

the access network equipment receives second uplink data initially transmitted by the terminal through the first HARQ process on the second time unit;

37. The method according to claim 35 or 36, wherein the reception status comprises an acknowledgement reception status ACK and a non-acknowledgement reception status NACK;

38. The method according to any of claims 34 to 37, wherein the reception status of the n second HARQ processes comprises: and the terminal sends the receiving state of other uplink data through the second HARQ process, and/or the terminal does not send the default receiving state of other uplink data through the second HARQ process.

39. The method of any one of claims 34 to 38,

or,

40. The method of any one of claims 34 to 39,

the first feedback information is further used for scheduling the terminal to send the second uplink data through m second HARQ processes of the n second HARQ processes, where m is greater than or equal to 1 and less than or equal to n, and m is an integer.

41. The method of claim 40,

and/or the presence of a gas in the gas,

wherein s is an integer not less than zero, and s is not more than m.

42. The method of any one of claims 34 to 41, further comprising:

and the access network equipment sends configuration information, wherein the configuration information is used for indicating the terminal to receive the first feedback information and the second feedback information on the downlink channel.

43. The method according to any of claims 34 to 42, wherein the first feedback information comprises time domain resource configuration information and/or frequency domain resource configuration information.

44. The method according to any of the claims 34 to 43, wherein the second feedback information is represented in the form of a bitmap.

45. The method according to any of claims 34 to 44, wherein the second feedback information further comprises time indication information, and the time indication information is used for indicating time units corresponding to the reception statuses of the n second HARQ processes.

46. The method of claim 45, wherein before the access network device sends the feedback information on the first time unit, further comprising:

and the access network equipment receives uplink data sent by the terminal through the n second HARQ processes on n time units, wherein the n time units are positioned before the first time unit on a time domain.

47. The method as claimed in claim 45 or 46, wherein the second feedback information is further used for indicating the receiving status corresponding to the first HARQ process, and the time indication information is further used for indicating the time unit corresponding to the receiving status of the first HARQ process.

48. The method according to any of claims 45 to 47, wherein the time indication information indicates a time range comprising time units corresponding to the reception states of the n second HARQ processes.

49. The method of claim 48,

50. The method of claim 49,

51. The method according to claim 49 or 50, wherein the length of time is associated with the number of bits corresponding to the reception status of the n second HARQ processes.

52. The method of any one of claims 48 to 51,

53. The method of claim 52, wherein the retransmission waiting duration further comprises a feedback delay, and wherein the feedback delay is a duration of an interval between a time when the terminal transmits uplink data through the second HARQ process meeting the preset condition and a time when a receiving status of the second HARQ process meeting the preset condition is received.

54. The method according to claim 52 or 53, wherein the preset condition is at least one of the following conditions:

55. The method of any one of claims 45 to 54, wherein n is greater than or equal to 2.

56. A method for sending feedback information, the method comprising:

the access network equipment receives uplink data sent by a terminal through n hybrid automatic repeat request (HARQ) processes on n time units, wherein n is a positive integer;

the access network equipment sends feedback information on a first time unit, wherein the feedback information comprises the receiving states of the n HARQ processes and time indication information, the time indication information is used for indicating time units corresponding to the receiving states of the n HARQ processes, and the n time units are located before the first time unit.

57. The method according to claim 56, wherein the time indication information indicates a time range corresponding to the n time units.

58. The method of claim 57,

59. The method of claim 58,

60. The method according to claim 58 or 59, wherein said length of time is associated with a number of bits corresponding to reception status of said n HARQ processes.

61. The method of any one of claims 57 to 60,

62. The method of claim 61, wherein the retransmission waiting duration further comprises a feedback delay, wherein the feedback delay is a duration of an interval between a time when the terminal transmits uplink data through the HARQ process meeting the preset condition and a time when the terminal receives a receiving status of the HARQ process meeting the preset condition.

63. The method according to claim 61 or 62, wherein the preset condition is at least one of the following conditions:

64. The method of any one of claims 56 to 63, wherein n is greater than or equal to 2.

65. The method according to any of claims 56 to 64, wherein the feedback information comprises first feedback information and second feedback information, the first feedback information is used for instructing the terminal to transmit uplink data through the first HARQ process in the second time unit, and the second feedback information comprises the receiving status of the n HARQ processes and the time indication information.

66. A method for sending feedback information, the method comprising:

the access network equipment receives the uplink data sent by the terminal through n hybrid automatic repeat request (HARQ) processes on n time units, wherein n is a positive integer;

the access network equipment sends feedback information on a first time unit, the feedback information comprises receiving states of the n HARQ processes, the time length between a time unit corresponding to the HARQ process meeting the preset condition in the n HARQ processes and the first time unit is less than or equal to retransmission waiting time, the retransmission waiting time comprises the timing time of an automatic retransmission timer, and the automatic retransmission timer is used for triggering the terminal to retransmit uplink data sent by the HARQ process meeting the preset condition.

67. A feedback information receiving apparatus, comprising:

a receiving unit, configured to receive feedback information in a first time unit, where the feedback information includes first feedback information and second feedback information sent through a same downlink channel;

a sending unit, configured to send the uplink data through a first HARQ process in a second time unit according to the first feedback information;

68. The apparatus of claim 67, wherein the sending unit is further configured to:

transmitting first uplink data through the first HARQ process on a third time unit;

the third time unit is located before the first time unit.

69. The method of claim 68, wherein the sending unit is further configured to:

retransmitting the first uplink data through the first HARQ process on the second time unit according to the first feedback information;

or,

according to the first feedback information, primarily transmitting second uplink data through the first HARQ process on the second time unit;

70. The apparatus according to any one of claims 67 to 69, wherein the receiving unit is further configured to:

and receiving configuration information, where the configuration information is used to instruct the terminal to receive the first feedback information and the second feedback information on the downlink channel.

71. The apparatus according to any of claims 67 to 70, wherein the second feedback information further comprises time indication information, and the time indication information is used to indicate time units corresponding to the reception statuses of the n second HARQ processes.

72. The apparatus of claim 71, wherein the time indication information indicates a time range including time units corresponding to the reception statuses of the n second HARQ processes.

73. A feedback information receiving apparatus, comprising:

a sending unit, configured to send uplink data through n HARQ processes in n time units, where n is a positive integer;

a receiving unit, configured to receive feedback information on a first time unit, where the feedback information includes the receiving statuses of the n HARQ processes and time indication information, the time indication information is used to indicate time units corresponding to the receiving statuses of the n HARQ processes, and the n time units are located before the first time unit.

74. A feedback information receiving apparatus, comprising:

the receiving unit is used for receiving feedback information on a first time unit, the feedback information comprises receiving states of the n HARQ processes, the time length between a time unit corresponding to the HARQ process meeting the preset condition in the n HARQ processes and the first time unit is smaller than or equal to retransmission waiting time, the retransmission waiting time comprises the timing time of an automatic retransmission timer, and the automatic retransmission timer is used for triggering the terminal to retransmit uplink data sent by the HARQ process meeting the preset condition.

75. A feedback information transmitting apparatus, characterized in that the apparatus comprises:

a sending unit, configured to send feedback information in a first time unit, where the feedback information includes first feedback information and second feedback information through a same downlink channel, and the first feedback information is used to schedule a terminal to send uplink data through a first HARQ process; the second feedback information is the receiving state of n second HARQ processes, the second HARQ processes are the HARQ processes of the terminal, and n is a positive integer;

a receiving unit, configured to receive, in a second time unit, the uplink data sent by the terminal through the first HARQ process;

the second time unit is located after the first time unit.

76. The apparatus of claim 75, wherein the receiving unit is further configured to:

receiving first uplink data sent by the terminal through the first HARQ process in a third time unit;

the third time unit is located before the first time unit.

77. The apparatus according to claim 75 or 76, wherein the sending unit is further configured to:

and sending configuration information, wherein the configuration information is used for indicating the terminal to receive the first feedback information and the second feedback information on the downlink channel.

78. The apparatus according to any of claims 75 to 77, wherein the second feedback information further comprises time indication information, and the time indication information is used for indicating time units corresponding to the reception statuses of the n second HARQ processes.

79. A feedback information transmitting apparatus, characterized in that the apparatus comprises:

a receiving unit, configured to receive, in n time units, uplink data sent by a terminal through n HARQ processes, where n is a positive integer;

a sending unit, configured to send feedback information on a first time unit, where the feedback information includes the receiving statuses of the n HARQ processes and time indication information, the time indication information is used to indicate time units corresponding to the receiving statuses of the n HARQ processes, and the n time units are located before the first time unit.

80. A feedback information transmitting apparatus, characterized in that the apparatus comprises:

a receiving unit, configured to receive uplink data sent by a terminal through n HARQ processes in n time units, where n is a positive integer;

the sending unit is used for sending feedback information on a first time unit, the feedback information comprises the receiving states of the n HARQ processes, the time length between a time unit corresponding to the HARQ process meeting the preset condition in the n HARQ processes and the first time unit is less than or equal to the retransmission waiting time length, the retransmission waiting time length comprises the timing time length of an automatic retransmission timer, and the automatic retransmission timer is used for triggering the terminal to retransmit uplink data sent by the HARQ process meeting the preset condition.

81. A feedback information system, characterized in that the system comprises a terminal and an access network device,

the terminal is the feedback information receiving apparatus of any one of claims 67 to 72; alternatively, the feedback information receiving apparatus according to claim 73; alternatively, the feedback information receiving apparatus according to claim 74;

the access network device is the feedback information transmitting apparatus of any one of claims 75 to 78; alternatively, the feedback information transmitting apparatus according to claim 79; alternatively, the feedback information transmission apparatus according to claim 80.