CN106452661B

CN106452661B - Response information transmission method and device, base station and terminal

Info

Publication number: CN106452661B
Application number: CN201510487253.0A
Authority: CN
Inventors: 梁春丽; 戴博; 夏树强; 杨维维; 左志松; 赵亚军
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2015-08-10
Filing date: 2015-08-10
Publication date: 2020-05-22
Anticipated expiration: 2035-08-10
Also published as: WO2017024860A1; CN106452661A

Abstract

The invention provides a transmission method, a device, a base station and a terminal of response information, wherein the method comprises the following steps: the base station configures a transmission mode of hybrid automatic repeat request (HARQ-ACK) of the terminal, and receives the HARQ-ACK transmitted by the terminal according to the transmission mode, so that the problem that downlink resources are wasted due to unnecessary PDSCH retransmission is solved, and the utilization rate of the downlink resources is improved.

Description

Response information transmission method and device, base station and terminal

Technical Field

The present invention relates to the field of communications, and in particular, to a method, an apparatus, a base station, and a terminal for transmitting response information.

Background

In a Hybrid Automatic Repeat Request (HARQ) mode, a code sent by a sending end not only can detect errors, but also has a certain error correction capability. After receiving the code word, the decoder at the receiving end firstly checks the error condition, if the error condition is within the error correction capability of the code, the error correction is automatically carried out, if the error condition is too many, the error condition exceeds the error correction capability of the code, but the error condition can be detected, the receiving end sends a judgment signal to the sending end through a feedback channel, and the sending end is required to resend information. In an Orthogonal Frequency Division Multiplexing (OFDM) system, correct/error transmission (ACK/NACK) is indicated by ACK/NACK control signaling to determine whether retransmission is required, and the ACK and NACK are collectively referred to as HARQ-ACK response information.

In a Long Term Evolution (LTE) system, for Downlink HARQ, a terminal (User Equipment, UE) may send HARQ-ACK response information of a Physical Downlink Shared Channel (PDSCH) on the Physical Uplink Shared Channel (PUSCH) or may send HARQ-ACK response information on a Physical Uplink Control Channel (PUCCH).

In Release 8, which is the first Release of LTE, only one carrier is supported, and thus, for transmission of HARQ-ACK response information, different feedback modes are defined for FDD (FDD: Frequency Division Duplex) and TDD (TDD: Time Division Duplex) systems, respectively. For an FDD system, as uplink and downlink carriers are in one-to-one correspondence, one uplink subframe corresponds to one downlink subframe, and the LTE defines a PUCCH format 1a/1b to feed back corresponding HARQ-ACK response information. For a TDD system, due to the asymmetry of the uplink and downlink subframe configurations, one uplink subframe may correspond to one or more downlink subframes, and for this reason, LTE defines two HARQ-ACK feedback modes, HARQ-ACK bundling and HARQ-ACK multiplexing, and HARQ-ACK response information corresponding to one or more downlink subframes is sent by using a PUCCH format 1a/1b and PUCCH format 1b joint channel selection mode respectively through corresponding processing. The PUCCH format 1b joint channel selection refers to that different PUCCH channels are selected to carry more HARQ-ACKs, where PUCCH format 1b may carry 2 bits of information, and through channel selection, for example, through 4 different PUCCH channels, 2 bits of information may be additionally carried, so that PUCCH format 1b joint channel selection may carry 4 bits of information at most, and may exactly correspond to 4 HARQ-ACK acknowledgement information.

Fig. 1 is a schematic structural diagram of PUCCH format 1a/1b according to the related art, and fig. 2 is a schematic structural diagram of joint channel selection according to PUCCH format 1b in the related art, and as shown in fig. 1 and fig. 2, one schematic structural diagram of joint channel selection of PUCCH format 1a/1b and PUCCH format 1b is given.

In the subsequent evolution of LTE, carrier aggregation is introduced as a key technology, namely, by aggregating the bandwidth of the LTE system to obtain a larger transmission bandwidth. In LTE Release 10, aggregation of up to 5 carriers can be supported. Since the defined PUCCH format 1a/1b can support 2-bit HARQ-ACK feedback at most when Release 8 is performed, and PUCCH format 1b joint channel selection also supports 4-bit HARQ-ACK feedback at most, PUCCH format 3 is introduced to support 22-bit feedback in Release 10, and fig. 3 is a schematic diagram of a PUCCH format 3 according to the related art.

In Release 13 version of LTE, the carrier aggregation technology is further enhanced, and aggregation to 32 carriers can be supported at most. As the number of carriers increases, the HARQ-ACK required for feedback also increases. For FDD system, 64-bit HARQ-ACK (without any bundling operation) needs to be fed back at most, while for TDD, 128-bit HARQ-ACK needs to be fed back at most even if uplink and downlink configuration 5 (uplink and downlink configuration for TDD is shown in table 1) is not considered and spatial bundling operation is performed on the subframe.

TABLE 1

As described above, PUCCH format 3 can only support 22-bit feedback at most, that is, HARQ-ACK feedback when Release 13 supports 32 carriers at most cannot be supported by using the existing PUCCH format. In the present discussion, one conclusion is that at least one new PUCCH format is introduced. In addition, there is a conference that a Cyclic Redundancy Check (CRC) is required to be added when the number of feedback HARQ-ACK bits exceeds 22 bits in order to ensure the reliability of HARQ-ACK. And the base station side judges whether the transmitted HARQ-ACK is wrong or not according to whether the CRC passes or not. When the CRC fails, it indicates that the transmitted HARQ-ACK is erroneous, but it is not known which HARQ-ACK is erroneous, so in order to ensure the robustness of downlink transmission, the base station needs to retransmit the PDSCH transmission on all carriers/subframes scheduled last time. Thus, due to CRC error, a large amount of unnecessary PDSCH retransmission is caused, downlink resources are wasted, and spectrum efficiency is affected. On the other hand, the determination of the number of HARQ-ACK bits is also a problem to be solved when feeding back HARQ-ACK.

For the problem that downlink resources are wasted due to unnecessary PDSCH retransmission in the related art, no effective solution exists at present.

Disclosure of Invention

The invention provides a method, a device, a base station and a terminal for transmitting response information, which are used for at least solving the problem that downlink resources are wasted due to unnecessary PDSCH retransmission in the related technology.

According to an aspect of the present invention, there is provided a method for transmitting acknowledgement information, including:

a base station configures a transmission mode of a hybrid automatic repeat request (HARQ-ACK) of a terminal;

and the base station receives HARQ-ACK sent by the terminal according to the sending mode.

Further, the transmission mode of the HARQ-ACK comprises at least one of the following modes:

a normal transmission mode;

repeating the transmission mode;

a retransmission mode is supported.

Further, the base station configures a transmission mode of a hybrid automatic repeat request acknowledgement message HARQ-ACK of the terminal, including at least one of:

the base station and the terminal appoint a default mode as the retransmission supporting mode;

the base station indicates the sending mode of the terminal to be one of the sending modes through a first configuration parameter of a high-level signaling;

the base station indicates the retransmission supporting mode through a second configuration parameter of a high-level signaling;

and the base station indicates the repeated sending mode through a third configuration parameter of a high-level signaling.

Further, the second configuration parameter is a newly added parameter, and the third configuration parameter is a newly added parameter, or the third configuration parameter is a parameter of a related protocol.

Further, when the base station configures the transmission mode of the HARQ-ACK of the terminal as the retransmission mode, the base station configures the number of times of the HARQ-ACK retransmission and the resource used in the retransmission.

Further, when the base station configures the HARQ-ACK transmission mode of the terminal as the retransmission supporting mode, the base station transmits downlink control information instructing the terminal to perform HARQ-ACK retransmission, where the downlink control information includes at least one of:

the base station indicates the terminal to perform HARQ-ACK retransmission through error response information NACK on physical hybrid automatic retransmission indication information PHICH;

and the base station indicates the terminal to perform HARQ-ACK retransmission through downlink control information DCI sent on a physical downlink control channel or an enhanced physical downlink control channel PDCCH or EPDCCH.

Further, when the base station instructs the terminal to perform HARQ-ACK retransmission through NACK on the PHICH, the resources of the PHICH are determined according to the resources carrying the HARQ-ACK;

when the base station instructs the terminal to perform HARQ-ACK retransmission through DCI sent on PDCCH or EPDCCH, the method comprises at least one of the following modes:

the base station indicates the specific state of the existing control domain of the existing DCI, wherein the specific state of the existing control domain of the DCI is a state that a relevant protocol is not used;

the base station scrambles the existing DCI through a special Radio Network Temporary Identifier (RNTI), the special RNTI is used for indicating that the DCI scrambled by the RNTI is the DCI for indicating the terminal to perform HARQ-ACK retransmission, and the special RNTI is configured to the terminal through a high-level signaling.

Further, in addition to the control field for indicating HARQ-ACK retransmission, the indicated control field in the DCI may further include at least one of:

a resource indication control field during the HARQ-ACK retransmission;

a transmission power control field when the HARQ-ACK is retransmitted;

and the modulation mode when the HARQ-ACK is retransmitted.

Further, when the base station configures the HARQ-ACK transmission mode of the terminal as the retransmission supporting mode, the base station receives the HARQ-ACK which is transmitted by the terminal for the first time on a first preset subframe;

and under the condition that the base station detects that the HARQ-ACK transmission sent by the terminal on the first preset subframe is wrong, when the base station does not send a downlink retransmission data packet or a new data packet corresponding to the HARQ-ACK before the second preset subframe, the base station receives HARQ-ACK retransmission information sent by the terminal on a third preset subframe.

Further, when the base station is configured with a HARQ-ACK retransmission mode and a HARQ-ACK retransmission mode enable at the same time, the base station and the base station agree, and the number of times of retransmission increases relative to the number of times of previous transmission during the HARQ-ACK retransmission.

Further, when the configuration of HARQ-ACK is sent on one physical downlink control channel PUCCH, the DCI is sent on a main downlink component carrier;

when the configuration of HARQ-ACK is transmitted on a plurality of PUCCHs, the DCI is transmitted on a primary component carrier corresponding to the PUCCH serving cell group.

Further, the base station carries Downlink Assignment Index (DAI) information in the DCI, and the DAI information is used for a terminal to determine the HARQ-ACK to be sent.

Further, the DAI information is a control field newly added in the DCI or an existing control field, and the meaning of the DAI information indicated by different DCIs is different, where the different DCIs refer to DCIs of different serving cells or subframes.

Further, the base station indicates the number of the service cells scheduled by the current service cell according to a certain sequence through the DAI in the DCI of the first N-m service cells in the N scheduled service cells, and the DAI in the DCI of the last m service cells indicates the total number of the service cells scheduled by the current subframe; or, the DAIs in the DCIs of the (N-m) th serving cells repeatedly scheduled by the DAIs in the DCIs of the last m serving cells; or the DAI in the DCI of the last m serving cells and the DAI of the DCI of the N-m serving cells to be scheduled have preset offset values which are the same, wherein N and m are positive integers, and m is a value agreed by the base station and the terminal.

According to another aspect of the present invention, there is also provided a method for transmitting acknowledgement information, including:

the terminal determines the transmission mode of the HARQ-ACK;

and the terminal sends HARQ-ACK to the base station through the sending mode.

a normal transmission mode;

repeating the transmission mode;

a retransmission mode is supported.

Further, the terminal determines that the transmission mode of the HARQ-ACK comprises at least one of the following:

the terminal and the base station agree that a default mode is the retransmission supporting mode;

Further, the second configuration parameter is a newly added configuration parameter, and the third configuration parameter is a newly added configuration parameter, or the third configuration parameter is a configuration parameter of a related protocol.

Further, when the HARQ-ACK transmission mode is determined to be the retransmission transmission mode, the terminal retransmits the HARQ-ACK on consecutive uplink subframes by using resources configured by a higher layer, where the number of consecutive uplink subframes is configured by the higher layer.

Further, when the HARQ-ACK transmission mode is determined to be the retransmission supporting mode, the terminal receives downlink control information which is sent by the base station and indicates the terminal to perform HARQ-ACK retransmission, and the terminal determines whether to perform HARQ-ACK retransmission according to the downlink control information.

Further, the terminal receives downlink control information which is sent by the base station and indicates the terminal to perform HARQ-ACK retransmission, and the downlink control information includes at least one of the following:

the terminal receives downlink control information sent by a PHICH, wherein the resource of the PHICH is determined according to the resource bearing the HARQ-ACK;

the terminal receives DCI transmitted on PDCCH or EPDCCH.

Further, when the terminal receives NACK on the PHICH, the terminal performs HARQ-ACK retransmission;

and when the control domain preset in the DCI received by the terminal is in a preset specific state, the terminal performs HARQ-ACK retransmission.

a resource indication control field during the HARQ-ACK retransmission;

a transmission power control field when the HARQ-ACK is retransmitted;

and the modulation mode when the HARQ-ACK is retransmitted.

Further, the terminal descrambles the DCI by adopting a special RNTI and acquires HARQ-ACK retransmission information related to the terminal according to index information configured by a high layer.

Further, when the downlink control information indicates that the terminal is to perform HARQ-ACK retransmission, the terminal performs HARQ-ACK retransmission on a third preset uplink subframe.

Further, when the HARQ-ACK transmission mode is determined to support a retransmission mode, the terminal does not receive a downlink retransmission data packet or a new data packet corresponding to the HARQ-ACK transmitted by the base station before a second preset subframe and the HARQ-ACK information transmitted by the terminal last time contains NACK, and the terminal retransmits the HARQ-ACK uplink in a third preset uplink subframe.

Further, the terminal performs HARQ-ACK retransmission on a third preset uplink subframe, including at least one of:

when the terminal does not send a PUSCH on the third preset uplink subframe, or the terminal sends a PUSCH on the third preset subframe and the terminal is configured to allow simultaneous transmission of a PUCCH and a PUSCH, the terminal performs HARQ-ACK retransmission on the third preset subframe by adopting a preset PUCCH resource, wherein the third preset uplink subframe is an uplink subframe determined according to the downlink control information, or an uplink subframe agreed with the base station, and the preset PUCCH resource is a PUCCH resource determined according to the downlink control information, or a PUCCH resource configured at a high layer;

and when the terminal has PUSCH transmission on the third preset subframe and the terminal is configured not to allow simultaneous transmission of the PUCCH and the PUSCH, the terminal performs HARQ-ACK retransmission on the PUSCH on the third preset subframe.

Further, when the HARQ-ACK transmission mode is determined as the combination mode of the retransmission supporting mode and the retransmission transmitting mode, the terminal repeatedly transmits the HARQ-ACK on resources configured by a high layer on consecutive uplink subframes, wherein the number of consecutive uplink subframes is configured by the high layer, and then performs subsequent processing for the retransmission supporting mode according to the HARQ-ACK transmission mode, and the terminal performs repeated transmission processing when it is required to transmit the HARQ-ACK.

Further, when the HARQ-ACK transmission mode is determined as the combination mode of the retransmission supporting mode and the retransmission mode, the base station makes an appointment with the base station according to the appointment with the base station, and when the terminal performs HARQ-ACK retransmission, the number of times of retransmission increases relative to the number of times of previous transmission.

Further, before the terminal sends the HARQ-ACK to the base station, the number of the HARQ-ACK bits needing to be fed back and the fed-back HARQ-ACK bit sequence are determined.

Further, the terminal determines the number of HARQ-ACK bits to be fed back and the HARQ-ACK bit sequence to be fed back according to the DAI sent by the base station.

Further, the DAI information is a control field newly added in the DCI or an existing control field, and the meaning of the DAI information indicated by different DCIs is different, where the different DCIs refer to DCIs of different serving cells or subframes. Further, the terminal ends to the number of the service cells already scheduled by the current service cell according to the DAI indication in the DCI of the first N-m service cells in the N service cells scheduled according to the agreement with the base station, and the DAI indication in the DCI of the last m service cells indicates the total number of the service cells scheduled by the current subframe; or, the DAIs in the DCIs of the (N-m) th serving cells repeatedly scheduled by the DAIs in the DCIs of the last m serving cells; or the DAI in the DCI of the last m serving cells and the DAI of the DCI of the N-m serving cells to be scheduled have preset offset values which are the same, wherein N and m are positive integers, and m is a value agreed by the base station and the terminal.

According to another aspect of the present invention, there is also provided an apparatus for transmitting acknowledgement information, located in a base station, including:

the base station is used for configuring a sending mode of a hybrid automatic repeat request response message HARQ-ACK of the terminal;

and the receiving module is used for receiving the HARQ-ACK sent by the terminal according to the sending mode by the base station.

a normal transmission mode;

repeating the transmission mode;

a retransmission mode is supported.

Further, the configuration module includes at least one of:

a first configuration unit, configured to enable the terminal and the base station to agree that a default mode is the retransmission support mode;

a second configuration unit, configured to indicate, by the base station, through a first configuration parameter of a higher layer signaling that a transmission mode of the terminal is one of the transmission modes;

a third configuration unit, configured to indicate, by the base station, the retransmission mode is supported through a second configuration parameter of a high-level signaling;

a fourth configuration unit, configured to indicate, by the base station, the repeated transmission mode through a third configuration parameter of a higher layer signaling.

According to another aspect of the present invention, there is also provided a base station, including: any one of the above devices for transmitting the response message.

According to another aspect of the present invention, there is also provided an apparatus for transmitting acknowledgement information, located in a terminal, including:

a determining module, configured to determine, by a terminal, a transmission mode of HARQ-ACK;

and the sending module is used for sending HARQ-ACK to the base station through the sending mode by the terminal.

a normal transmission mode;

repeating the transmission mode;

a retransmission mode is supported.

Further, the determining module includes at least one of:

a first determining unit, configured to enable the terminal and the base station to agree that a default mode is the retransmission support mode;

a second determining unit, configured to indicate, by the base station, through a first configuration parameter of a higher layer signaling that a transmission mode of the terminal is one of the transmission modes;

a third determining unit, configured to indicate, by the base station, the retransmission mode is supported through a second configuration parameter of a higher layer signaling;

a fourth determining unit, configured to indicate, by the base station, the repeated transmission mode through a third configuration parameter of a higher layer signaling.

According to another aspect of the present invention, there is also provided a terminal, comprising: any one of the above devices for transmitting the response message.

According to the invention, the base station configures the transmission mode of the hybrid automatic repeat request response message HARQ-ACK of the terminal, and the base station receives the HARQ-ACK transmitted by the terminal according to the transmission mode, so that the problem that downlink resources are wasted due to unnecessary PDSCH retransmission is solved, and the utilization rate of the downlink resources is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a diagram illustrating a structure of a PUCCH format 1a/1b according to the related art;

fig. 2 is a diagram illustrating a structure of joint channel selection according to PUCCH format 1b in the related art;

fig. 3 is a diagram illustrating a structure of a PUCCH format 3 according to the related art;

fig. 4 is a first flowchart of a method for transmitting response information according to an embodiment of the present invention;

fig. 5 is a flowchart ii of a method for transmitting response information according to an embodiment of the present invention;

fig. 6 is a block diagram of a first apparatus for transmitting a response message according to an embodiment of the present invention;

fig. 7 is a block diagram of a second configuration of an apparatus for transmitting response information according to an embodiment of the present invention;

fig. 8 is a structural diagram of a new PUCCH format candidate according to the preferred embodiment of the present invention;

fig. 9 is an exemplary diagram of PDSCH transmission, HARQ-ACK transmission, and PDSCH retransmission according to a preferred embodiment of the present invention;

fig. 10 is a schematic diagram of a DCI design according to a preferred embodiment of the present invention;

fig. 11 is an exemplary diagram of PDSCH retransmission according to a preferred embodiment of the present invention;

FIG. 12 is an exemplary diagram illustrating a retransmission mode agreed upon without sending new packets or retransmitting packets in accordance with a preferred embodiment of the present invention;

fig. 13 is a first schematic diagram illustrating an example of a processing procedure of a base station of a terminal when the base station configures an HARQ-ACK transmission mode of the terminal as a repeat-combine retransmission mode according to a preferred embodiment of the present invention;

fig. 14 is a diagram illustrating an example of a process performed by the base station of the terminal when the base station configures the HARQ-ACK transmission mode of the terminal as the repeat-join retransmission mode according to the preferred embodiment of the present invention;

FIG. 15 is a first schematic diagram of a DAI in accordance with a preferred embodiment of the present invention;

FIG. 16 is a second schematic diagram of a DAI in accordance with a preferred embodiment of the present invention;

FIG. 17 is a third schematic diagram of a DAI in accordance with a preferred embodiment of the present invention;

FIG. 18 is a diagram of a DAI in accordance with the preferred embodiment of the present invention;

FIG. 19 is a schematic diagram of a DAI according to a preferred embodiment of the present invention;

FIG. 20 is a six schematic representation of a DAI in accordance with a preferred embodiment of the present invention;

fig. 21 is a seventh schematic diagram of a DAI in accordance with a preferred embodiment of the present invention.

Detailed Description

The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

In this embodiment, a method for transmitting response information is provided, and fig. 4 is a first flowchart of a method for transmitting response information according to an embodiment of the present invention, as shown in fig. 4, the flowchart includes the following steps:

step S402, the base station configures the transmission mode of hybrid automatic repeat request (HARQ-ACK) of the terminal;

step S404, the base station receives HARQ-ACK sent by the terminal according to the sending mode.

Through the steps, the base station configures the transmission mode of the hybrid automatic repeat request response message HARQ-ACK of the terminal, and the base station receives the HARQ-ACK transmitted by the terminal according to the transmission mode, so that the problem that downlink resources are wasted due to unnecessary PDSCH retransmission is solved, and the utilization rate of the downlink resources is improved.

In this embodiment, the transmission mode of the HARQ-ACK includes at least one of:

a normal transmission mode;

repeating the transmission mode;

a retransmission mode is supported.

In this embodiment, the transmission mode of the HARQ-ACK of the terminal configured by the base station includes at least one of:

in the mode 1, the base station and the terminal agree that the default mode is the retransmission supporting mode;

mode 2, the base station indicates, through a first configuration parameter of a high-level signaling, that the transmission mode of the terminal is one of the transmission modes;

mode 3, the base station indicates the retransmission supporting mode through a second configuration parameter of a high-level signaling;

mode 4, the base station indicates the repeated transmission mode through a third configuration parameter of a higher layer signaling.

In this embodiment, the second configuration parameter is a newly added parameter, and the third configuration parameter is a newly added parameter, or the third configuration parameter is a parameter of a related protocol.

In this embodiment, when the base station configures the transmission mode of the HARQ-ACK of the terminal as the retransmission mode, the base station configures the number of times of the HARQ-ACK retransmission and the resource used in the retransmission.

In this embodiment, when the base station configures the HARQ-ACK transmission mode of the terminal as the retransmission supporting mode, the base station transmits downlink control information instructing the terminal to perform HARQ-ACK retransmission, where the downlink control information includes at least one of:

In this embodiment, when the base station instructs the terminal to perform HARQ-ACK retransmission through NACK on the PHICH, the PHICH resource is determined according to the resource carrying the HARQ-ACK;

the base station scrambles DCI with the existing size through a special Radio Network Temporary Identifier (RNTI), the special RNTI is used for indicating that the DCI scrambled by the RNTI is the DCI for indicating the terminal to perform HARQ-ACK retransmission, and the special RNTI is configured to the terminal through a high-level signaling.

In this embodiment, in addition to the control field for indicating HARQ-ACK retransmission, the indicated control field in the DCI further includes at least one of the following:

a resource indication control field during the HARQ-ACK retransmission;

a transmission power control field when the HARQ-ACK is retransmitted;

and the modulation mode when the HARQ-ACK is retransmitted.

In this embodiment, when the base station configures the HARQ-ACK transmission mode of the terminal as the retransmission supporting mode, the base station receives HARQ-ACK that is first transmitted by the terminal on a first preset subframe;

In this embodiment, when the base station configures an HARQ-ACK retransmission mode and an HARQ-ACK retransmission mode enable at the same time, the base station and the base station agree, and the number of times of retransmission increases relative to the number of times of previous transmission during HARQ-ACK retransmission.

In this embodiment, when the configuration of HARQ-ACK is sent on one physical downlink control channel, PUCCH, the DCI is sent on a primary downlink component carrier;

In this embodiment, the base station carries Downlink assignment index information (DAI) in DCI, where the DAI information is used for a terminal to determine HARQ-ACK to be sent.

In this embodiment, the DAI information is a control field newly added to the DCI or an existing control field, and the meaning of the DAI information indicated by different DCIs is different, where the different DCIs refer to DCIs of different serving cells or subframes.

In this embodiment, the base station indicates, according to a certain order, the number of serving cells scheduled by the current serving cell by the DAI indication in the DCI of the first N-m serving cells in the N scheduled serving cells, and indicates the total number of serving cells scheduled by the current subframe by the DAI indication in the DCI of the last m serving cells; or, the DAIs in the DCIs of the (N-m) th serving cells repeatedly scheduled by the DAIs in the DCIs of the last m serving cells; or the DAI in the DCI of the last m serving cells and the DAI of the DCI of the N-m serving cells to be scheduled have preset offset values which are the same, wherein N and m are positive integers, and m is a value agreed by the base station and the terminal.

In this embodiment, a method for transmitting response information is further provided, and fig. 5 is a second flowchart of a method for transmitting response information according to an embodiment of the present invention, as shown in fig. 5, where the flowchart includes the following steps:

step S502, the terminal determines the sending mode of HARQ-ACK;

step S504, the terminal sends HARQ-ACK to the base station through the sending mode.

Through the steps, the terminal determines the transmission mode of the HARQ-ACK, and the terminal transmits the HARQ-ACK to the base station through the transmission mode, so that the problem that downlink resources are wasted due to unnecessary PDSCH retransmission is solved, and the utilization rate of the downlink resources is improved.

a normal transmission mode;

repeating the transmission mode;

a retransmission mode is supported.

In this embodiment, the terminal determines that the transmission mode of HARQ-ACK includes at least one of:

in the mode 1, the terminal and the base station agree that the default mode is the retransmission supporting mode;

In this embodiment, the second configuration parameter is a newly added configuration parameter, and the third configuration parameter is a newly added configuration parameter, or the third configuration parameter is a configuration parameter of a related protocol.

In this embodiment, when the HARQ-ACK transmission mode is determined as the retransmission transmission mode, the terminal retransmits the HARQ-ACK on consecutive uplink subframes by using resources configured by a higher layer, where the number of consecutive uplink subframes is configured by the higher layer.

In this embodiment, when the HARQ-ACK transmission mode is determined to be the retransmission support mode, the terminal receives downlink control information that is sent by the base station and indicates the terminal to perform HARQ-ACK retransmission, and the terminal determines whether to perform HARQ-ACK retransmission according to the downlink control information.

In this embodiment, the receiving, by the terminal, downlink control information that instructs the terminal to perform HARQ-ACK retransmission and is sent by the base station includes at least one of the following:

the terminal receives DCI transmitted on PDCCH or EPDCCH.

In this embodiment, when the terminal receives NACK on the PHICH, the terminal performs HARQ-ACK retransmission;

a resource indication control field during the HARQ-ACK retransmission;

a transmission power control field when the HARQ-ACK is retransmitted;

and the modulation mode when the HARQ-ACK is retransmitted.

In this embodiment, the terminal descrambles the DCI using a dedicated RNTI, and obtains HARQ-ACK retransmission information related to the terminal according to index information configured by a high layer.

In this embodiment, when the downlink control information indicates that the terminal is to perform HARQ-ACK retransmission, the terminal performs HARQ-ACK retransmission on a third preset uplink subframe.

In this embodiment, when the HARQ-ACK transmission mode is determined to support a retransmission mode, and the terminal does not receive a downlink retransmission data packet or a new data packet corresponding to the HARQ-ACK transmitted by the base station before a second preset subframe, and the HARQ-ACK information transmitted by the terminal last time includes NACK, the terminal retransmits the HARQ-ACK uplink in a third preset uplink subframe.

In this embodiment, the terminal performs HARQ-ACK retransmission on a third preset uplink subframe, where the HARQ-ACK retransmission includes at least one of the following:

In this embodiment, when the HARQ-ACK transmission mode is determined as the combination mode of the retransmission support mode and the retransmission transmission mode, the terminal first repeatedly transmits the HARQ-ACK on resources configured by a higher layer on consecutive uplink subframes, where the number of consecutive uplink subframes is configured by the higher layer, and then performs subsequent processing for the retransmission support mode according to the HARQ-ACK transmission mode, and the terminal performs repeated transmission processing when it is to transmit the HARQ-ACK.

In this embodiment, when the HARQ-ACK transmission mode is determined to be the combined mode of the retransmission supporting mode and the retransmission mode, the base station makes an appointment with the base station, and when the terminal performs HARQ-ACK retransmission, the number of times of retransmission increases relative to the number of times of previous transmission.

In this embodiment, before the terminal sends HARQ-ACK to the base station, the number of HARQ-ACK bits to be fed back and the fed-back HARQ-ACK bit sequence are determined.

In this embodiment, the terminal determines the number of HARQ-ACK bits to be fed back and the HARQ-ACK bit sequence to be fed back according to the DAI sent by the base station.

In this embodiment, the DAI information is a control field newly added to DCI or an existing control field, and the meaning of the DAI information indicated by different DCIs is different, where the different DCIs refer to DCIs of different serving cells or subframes. In this embodiment, the terminal ends to the number of the service cells already scheduled by the current service cell according to the DAI indication in the DCI of the first N-m service cells in the N service cells scheduled according to the order agreed with the base station, and the DAI indication in the DCI of the last m service cells indicates the total number of the service cells scheduled by the current subframe; or, the DAIs in the DCIs of the (N-m) th serving cells repeatedly scheduled by the DAIs in the DCIs of the last m serving cells; or the DAI in the DCI of the last m serving cells and the DAI of the DCI of the N-m serving cells to be scheduled have preset offset values which are the same, wherein N and m are positive integers, and m is a value agreed by the base station and the terminal.

In this embodiment, a device for transmitting response information is further provided, where the device is used to implement the foregoing embodiments and preferred embodiments, and details are not repeated for what has been described. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.

Fig. 6 is a block diagram of a first configuration of an apparatus for transmitting acknowledgement information according to an embodiment of the present invention, which is located in a base station, as shown in fig. 6, and includes

A configuration module 62, configured to configure a transmission mode of a hybrid automatic repeat request acknowledgement message HARQ-ACK of the terminal by the base station;

a receiving module 64, configured to receive, by the base station, HARQ-ACK sent by the terminal according to the sending mode.

Through the device, the base station configures the transmission mode of the hybrid automatic repeat request response message HARQ-ACK of the terminal, and the base station receives the HARQ-ACK transmitted by the terminal according to the transmission mode, so that the problem that downlink resources are wasted due to unnecessary PDSCH retransmission is solved, and the utilization rate of the downlink resources is improved.

In this embodiment, the transmission mode of the HARQ-ACK includes at least one of: a normal transmission mode; repeating the transmission mode; a retransmission mode is supported.

In this embodiment, the configuration module includes at least one of:

In an embodiment of the present invention, there is further provided a base station, where the base station includes any one of the transmission apparatuses for the response information.

Fig. 7 is a block diagram of a second structure of an apparatus for transmitting response information according to an embodiment of the present invention, which is located in a terminal, as shown in fig. 7, and includes

A determining module 72, configured to determine a transmission mode of HARQ-ACK by the terminal;

a sending module 74, configured to send HARQ-ACK to the base station through the sending mode by the terminal.

By the device, the terminal determines the transmission mode of the HARQ-ACK, and the terminal transmits the HARQ-ACK to the base station through the transmission mode, so that the problem that downlink resources are wasted due to unnecessary PDSCH retransmission is solved, and the utilization rate of the downlink resources is improved.

In this embodiment, the determining module includes at least one of:

In an embodiment of the present invention, a terminal is further provided, where the terminal includes any one of the above-mentioned transmission devices for the response information.

The present invention will be described in detail with reference to preferred embodiments.

The present preferred embodiment provides a base station, which configures an HARQ-ACK transmission mode of a terminal; and receiving the HARQ-ACK sent by the terminal.

Further, the HARQ-ACK transmission mode includes at least one of: a normal transmission mode; repeating the transmission mode; a retransmission mode is supported.

Further, the configuring the HARQ-ACK transmission mode of the terminal includes, but is not limited to, the following ways:

appointing a default mode with the terminal as a retransmission supporting mode;

configuring the three HARQ-ACK transmission modes through high-layer signaling;

configuring a 'support retransmission mode' through high-layer signaling;

the "repeat transmission mode" is configured by higher layer signaling.

Further, the "retransmission supported mode" is a newly added configuration parameter, and the "repeated transmission mode" is a newly added configuration parameter or an existing configuration parameter.

Further, when the base station configures the HARQ-ACK transmission mode of the terminal as a retransmission mode, the base station needs to configure the number of HARQ-ACK retransmission times and resources used in retransmission.

Further, when the base station configures the HARQ-ACK transmission mode of the terminal as a retransmission supporting mode, the base station transmits downlink control information instructing the terminal to perform HARQ-ACK retransmission, including but not limited to the following manners:

the base station instructs the terminal to perform HARQ-ACK retransmission through NACK on a PHICH;

the base station indicates the terminal to perform HARQ-ACK retransmission through DCI sent on PDCCH or EPDCCH;

further, when the base station indicates the terminal to perform HARQ-ACK retransmission through NACK on a Physical Hybrid automatic repeat request Channel (PHICH), the resource of the PHICH is determined according to the resource carrying the HARQ-ACK.

Further, when the base station instructs the terminal to perform HARQ-ACK retransmission through DCI transmitted on PDCCH or EPDCCH, the following methods are included, but not limited to:

the base station indicates the specific state of the existing control domain of the existing DCI, wherein the specific state of the existing control domain of the DCI is a state that an existing protocol is not used;

the base station scrambles the DCI with the existing size through a special Radio Network Temporary Identity (RNTI), and the special RNTI is used for indicating the DCI scrambled by the RNTI as the DCI for indicating the terminal to perform HARQ-ACK retransmission.

Further, the special RNTI is configured to the terminal through a high-level signaling.

Further, in addition to the control field for indicating HARQ-ACK retransmission, other control fields in the DCI may further include at least one of:

a resource indication control field during the HARQ-ACK retransmission;

a transmission power control field when the HARQ-ACK is retransmitted;

and the modulation mode when the HARQ-ACK is retransmitted.

Further, when HARQ-ACK is configured to be transmitted on only one PUCCH, the DCI is transmitted on a primary downlink component carrier (component carrier is also referred to as a serving cell).

Further, when HARQ-ACK is configured to be transmitted on multiple PUCCHs, the DCI is transmitted on a primary component carrier corresponding to the PUCCH serving cell group.

Further, when the base station configures the HARQ-ACK transmission mode of the terminal as a retransmission supporting mode, the base station receives HARQ-ACK that is first transmitted by the terminal on a first preset subframe, and if the base station detects that the HARQ-ACK transmission transmitted by the terminal on the first preset subframe is incorrect, the base station receives HARQ-ACK retransmission information transmitted by the terminal on a third preset subframe when the base station does not transmit a downlink retransmission data packet or a new data packet corresponding to the HARQ-ACK before a second preset subframe.

Further, when the base station enables the HARQ-ACK repeated transmission mode and the HARQ-ACK repeated transmission mode at the same time, the base station and the base station agree, and the repeated transmission times are increased relative to the previous transmission times during the HARQ-ACK retransmission.

In this embodiment, the base station indicates, according to a certain order, the number of serving cells scheduled by the current serving cell by the DAI indication in the DCI of the first N-m serving cells in the N scheduled serving cells, and indicates the total number of serving cells scheduled by the current subframe by the DAI indication in the DCI of the last m serving cells; or, the DAIs in the DCIs of the (N-m) th serving cells repeatedly scheduled by the DAIs in the DCIs of the last m serving cells; or the DAI in the DCI of the last m serving cells and the DAI of the DCI of the N-m serving cells which are scheduled have preset offset values which are the same, wherein N and m are positive integers, and m is a value agreed by the base station and the terminal

The preferred embodiment further provides a terminal for determining the transmission mode of the HARQ-ACK; and sending the HARQ-ACK.

Further, the determining the transmission mode of the HARQ-ACK includes, but is not limited to, the following:

appointing a default mode with a base station as a retransmission supporting mode;

and determining the transmission mode of the HARQ-ACK according to the higher layer signaling.

Further, when the terminal determines the transmission mode of HARQ-ACK according to higher layer signaling, the method includes, but is not limited to, one of the following manners:

(1) determining that the transmission mode of the HARQ-ACK is one of the three modes according to the high-layer signaling;

(2) when the high-level signaling only configures an information unit supporting retransmission, the terminal determines the HARQ-ACK transmission mode as a retransmission supporting mode;

when the information unit which is only sent repeatedly is configured in the high-level signaling, the terminal determines the HARQ-ACK sending mode as a repeated sending mode;

when the high-level signaling simultaneously configures an information unit supporting a retransmission mode and an information unit repeatedly transmitted, the terminal determines that the HARQ-ACK transmission mode is a repeat-combined retransmission mode;

otherwise, the terminal determines that the HARQ-ACK transmission mode is a normal transmission mode.

Further, the "retransmission support mode" is a newly added configuration parameter, and the "repeat transmission mode" is a newly added configuration parameter or an existing configuration parameter

Further, when the HARQ-ACK transmission mode is determined to be a retransmission transmission mode, the terminal retransmits the HARQ-ACK on a resource configured by a higher layer on consecutive uplink subframes, where the number of consecutive uplink subframes is configured by the higher layer.

Further, the terminal receives downlink control information that is sent by the base station and instructs the terminal to perform HARQ-ACK retransmission, which includes but is not limited to the following modes:

the terminal receives DCI transmitted on PDCCH or EPDCCH.

Further, when the terminal receives the NACK on the PHICH, the terminal performs HARQ-ACK retransmission.

Further, when the control domain preset in the DCI received by the terminal is in a preset specific state, the terminal performs HARQ-ACK retransmission.

Further, in addition to the preset control field for indicating HARQ-ACK retransmission, other control fields in the DCI include at least one of the following:

a resource indication control field during the HARQ-ACK retransmission;

a transmission power control field when the HARQ-ACK is retransmitted;

and the modulation mode when the HARQ-ACK is retransmitted.

Further, the terminal descrambles the DCI by using a special RNTI and acquires HARQ-ACK retransmission information related to the terminal according to index information configured by a high layer.

Further, when the HARQ-ACK transmission mode is determined to support the retransmission mode, the terminal does not receive a downlink retransmission data packet or a new data packet corresponding to the HARQ-ACK, which is sent by the base station, before the second preset subframe, and when the HARQ-ACK sent by the terminal last time contains NACK, the terminal retransmits the HARQ-ACK on the third preset uplink subframe.

Further, the terminal performs HARQ-ACK retransmission on a third preset uplink subframe, specifically:

when the terminal does not send a PUSCH on the third preset uplink subframe, or the terminal sends a PUSCH on the third preset subframe and the terminal is configured to allow simultaneous transmission of a PUCCH and a PUSCH, the terminal performs HARQ-ACK retransmission on the third preset subframe by adopting a preset PUCCH resource, wherein the third preset uplink subframe is an uplink subframe determined according to the downlink control information, or an uplink subframe agreed with the base station, and the preset PUCCH resource is a PUCCH resource determined according to the downlink control information, or a PUCCH resource configured at a high layer; or

Further, when the HARQ-ACK transmission mode is determined to be a repeat-combined retransmission transmission mode, the terminal first repeats transmission of the HARQ-ACK on resources configured by a higher layer on consecutive uplink subframes, wherein the number of consecutive uplink subframes is configured by the higher layer; and then, carrying out subsequent processing for a retransmission mode according to the HARQ-ACK transmission mode, and carrying out repeated transmission processing when the terminal needs to transmit the HARQ-ACK.

Further, when the HARQ-ACK transmission mode is determined to be the combined mode of the retransmission supporting mode and the retransmission mode, the terminal increases the number of times of retransmission relative to the number of times of the previous HARQ-ACK retransmission at each HARQ-ACK retransmission according to the agreement with the base station.

Further, the terminal ends to the number of the service cells already scheduled by the current service cell according to the DAI indication in the DCI of the first N-m service cells in the N service cells scheduled according to the agreement with the base station, and the DAI indication in the DCI of the last m service cells indicates the total number of the service cells scheduled by the current subframe; or, the DAIs in the DCIs of the (N-m) th serving cells repeatedly scheduled by the DAIs in the DCIs of the last m serving cells; or the DAI in the DCI of the last m serving cells and the DAI of the DCI of the N-m serving cells to be scheduled have preset offset values which are the same, wherein N and m are positive integers, and m is a value agreed by the base station and the terminal.

Preferred embodiment 1: new PUCCH format, and illustrative example of problem existence

In the discussion of the LTE later release, in order to support HARQ-ACK feedback of more carrier aggregation in enhanced carrier aggregation, a new PUCCH format needs to be introduced. Fig. 8 is a schematic structural diagram of a candidate new PUCCH format according to a preferred embodiment of the present invention, and as shown in fig. 8, the new PUCCH format can support feedback of more HARQ-ACKs, and as shown in fig. 8, in consideration of QPSK modulation, and in a case that a code rate of channel coding is guaranteed to be equal to or less than 0.5, feedback of at most 144 bits can be supported. Due to the fact that the number of bits supported is large, for the HARQ-ACK feedback larger than 22 bits, CRC needs to be added, so that the base station side can detect whether the HARQ-ACK transmission is wrong or not. The main reason that the existing PUCCH format does not support CRC is that the existing PUCCH format can only support 22-bit feedback at most, and if CRC is added, the number of useful HARQ-ACK bits that can be supported becomes small, and the overhead proportion of CRC is too large, so that the existing PUCCH formats do not support CRC.

After the CRC is added, the base station side can find whether the HARQ-ACK transmission is wrong through the CRC, and compared with the existing PUCCH format, the robustness of the HARQ-ACK is better. However, since the CRC can only find errors, but cannot determine which bits are erroneous, from the base station, in order to ensure reliable transmission of the system, when the CRC is detected to be incorrect, all PDSCH transmissions corresponding to the HARQ-ACK must be retransmitted, which is a waste of resources for the PDSCH that has been transmitted correctly, resulting in unnecessary retransmission of the PDSCH and affecting the spectrum efficiency. FIG. 9 is an exemplary diagram of PDSCH transmission, HARQ-ACK transmission and PDSCH retransmission according to the preferred embodiment of the invention, as shown in FIG. 9, in this example, a base station transmits PDSCH on sub-frame 0 of radio frame n, a terminal receives PDSCH on sub-frame 0 of radio frame n, and performs HARQ-ACK feedback on sub-frame 4 of radio frame n according to the detection result; the base station detects the HARQ-ACK on the subframe 4 of the wireless frame n, judges that the HARQ-ACK transmission is wrong according to the CRC, and because the base station can not determine where the transmitted HARQ-ACK transmission is wrong, the base station retransmits all the PDSCH transmissions on the last time on the subframe 8 of the wireless frame n.

Preferred embodiment 2: examples of Transmission modes

The HARQ-ACK transmission mode of the terminal includes at least one of:

normal transmission mode

Repetitive transmission mode

A retransmission mode is supported.

In the normal transmission mode, the terminal only transmits HARQ-ACK once, and the base station judges whether the corresponding PDSCH needs to be retransmitted or not according to the received HARQ-ACK. This is the default HARQ-ACK transmission mode supported by the existing protocols, which is adopted by PUCCH format 1b in combination with channel selection and PUCCH format 3 by default.

And a repeated transmission mode, wherein when a high-level parameter related to the PUCCH configures the configuration parameter 'ackNackrepetition', the repeated transmission mode is enabled, and the high-level parameter 'ackNackrepetition' also configures the number of times 'repetitionFactor' for the terminal to repeatedly transmit the HARQ-ACK and PUCCH channel resources used when the HARQ-ACK is repeatedly transmitted. When the terminal adopts a repeated transmission mode to transmit the HARQ-ACK, the terminal repeatedly transmits the HARQ-ACK on continuous uplink subframes, and the base station determines the retransmission of the PDSCH after receiving the HARQ-ACK of a plurality of uplink subframes. The IE configured by the high layer is used for the PUCCH formats 1a/1b in the existing protocol, and in the enhanced carrier aggregation system, for the newly added PUCCH formats, the IE can be considered to be used for configuring the repeated transmission mode of the new PUCCH formats, and the repeated transmission mode of the new PUCCH formats can also be configured through newly added configuration parameters.

Support for retransmission mode: in a retransmission mode, after receiving a corresponding retransmission triggering signaling, or when a downlink retransmission data packet or a new data packet corresponding to the HARQ-ACK sent for the first time is not received before a second preset subframe and the HARQ-ACK sent for the previous time by the terminal contains NACK, the terminal retransmits the HARQ-ACK sent for the last time on a third preset subframe; the downlink retransmission data packet or the new data packet corresponding to the HARQ-ACK sent for the first time refers to downlink transmission having the same process number as the first-transmitted PDSCH. The HARQ-ACK retransmission may be sent on the PUCCH or the PUSCH, specifically:

when the terminal does not send a PUSCH on the third preset uplink subframe, or the terminal sends a PUSCH on the third preset subframe and the terminal is configured to allow simultaneous transmission of a PUCCH and a PUSCH, the terminal performs HARQ-ACK retransmission on the third preset subframe by adopting a preset PUCCH resource, wherein the third preset uplink subframe is an uplink subframe determined according to the downlink control information, or an uplink subframe agreed with the terminal, and the preset PUCCH resource is a PUCCH resource determined according to the downlink control information, or a PUCCH resource configured at a high layer;

and when the terminal has PUSCH transmission on the third preset subframe and the terminal is configured not to allow simultaneous transmission of the PUCCH and the PUSCH, the terminal performs HARQ-ACK retransmission on the PUSCH on the third preset subframe. Repeat-combined retransmission transmission mode: the terminal firstly repeatedly sends the HARQ-ACK on resources configured by a high layer on continuous uplink subframes, wherein the number of the continuous uplink subframes is configured by the high layer; and then, carrying out subsequent processing for a retransmission mode according to the HARQ-ACK transmission mode, and carrying out repeated transmission processing when the terminal needs to transmit the HARQ-ACK.

Preferred embodiment 3: example of base station configuration transmission mode

The base station configures a transmission mode of HARQ-ACK of the terminal, wherein the transmission mode comprises one of the following three types:

normal transmission mode

Repetitive transmission mode

A retransmission mode is supported.

Preferably, the base station configures the HARQ-ACK transmission mode of the terminal, and may adopt one of the following modes:

When the terminal determines the transmission mode of the HARQ-ACK according to the high-layer signaling, the method includes but is not limited to one of the following modes:

when the high-level signaling only configures the repeatedly transmitted information unit, the terminal determines the HARQ-ACK transmission mode as a repeated transmission mode;

Further, the "retransmission supported mode" is a newly added configuration parameter, and the "repeated transmission mode" is an existing configuration parameter or a newly added configuration parameter.

In order to avoid the influence on the existing terminal, the base station only appoints the HARQ-ACK transmission mode with the terminal supporting the new PUCCH format as a retransmission supporting mode. For a terminal supporting a new PUCCH format, the transmission mode of HARQ-ACK defaults to a retransmission mode. The terminal detects downlink control information after sending HARQ-ACK for the first time, and retransmits the HARQ-ACK on a third preset uplink subframe when the downlink control information triggers HARQ-ACK retransmission; or after the terminal sends the HARQ-ACK for the first time, when the terminal does not receive the downlink retransmission data packet or the new data packet corresponding to the HARQ-ACK sent for the first time before the second preset subframe and the HARQ-ACK sent for the previous time by the terminal contains NACK, the terminal retransmits the HARQ-ACK on a third preset uplink subframe.

The base station may further configure the HARQ-ACK transmission mode to be one of the three transmission modes through a higher layer signaling, for example, the HARQ-ACK transmission mode of the terminal may be configured through a 2-bit higher layer signaling.

Or, the base station may add a configuration parameter for supporting HARQ-ACK retransmission in the higher layer signaling parameter PUCCH-Config, and configure some relevant parameters for supporting HARQ-ACK retransmission to the terminal. After the base station configures the IE in the PUCCH-config, the UE enters a HARQ-ACK supported retransmission mode.

The HARQ-ACK retransmission mode is only applicable to a scenario that CRC is added during HARQ-ACK transmission, for example, when the HARQ-ACK is greater than 22 bits, for other cases, because the HARQ-ACK has no CRC, the base station side cannot determine whether the HARQ-ACK transmission is erroneous, and thus is not applicable.

Preferred embodiment 4: example of Signaling triggered retransmission modes

When the base station configures the HARQ-ACK transmission mode of the terminal as a retransmission supporting mode, the base station performs receiving detection on the HARQ-ACK, and when the CRC of the HARQ-ACK does not pass, the base station judges that the HARQ-ACK transmission is wrong, and at the moment, the base station can inform the terminal of performing HARQ-ACK retransmission by sending downlink control information.

The base station informs the terminal of performing HARQ-ACK retransmission by sending downlink control information, and can adopt one of the following modes:

the base station instructs the terminal to perform HARQ-ACK retransmission through NACK on the PHICH;

the base station instructs the terminal to perform HARQ-ACK retransmission through DCI transmitted on PDCCH or EPDCCH.

When the base station instructs the terminal to perform HARQ-ACK retransmission using NACK transmitted on the PHICH, resources used when the base station transmits the PHICH are determined according to PUCCH resources transmitting HARQ-ACK. When the PUCCH for transmitting HARQ-ACK is in the new format as shown in fig. 8, the PUCCH resource includes a PRB (Physical resource block) index where the PUCCH resource is located and a CS (Cyclic shift) index used by a DMRS (Demodulation Reference signal). The PHICH resource used when the base station transmits the trigger HARQ-ACK retransmission is determined according to the PRB index and the CS index of the DMRS.

When the base station instructs the terminal to perform HARQ-ACK retransmission by using DCI transmitted on PDCCH or EPDCCH, one of the following methods may be used:

mode 1: the base station indicates the specific state of the existing control domain of the existing DCI, wherein the specific state of the existing control domain of the DCI is a state that an existing protocol is not used;

mode 2: and the base station scrambles the DCI with the existing size through a special RNTI, and the special RNTI is used for indicating the DCI scrambled by the RNTI to be the DCI for indicating the terminal to carry out HARQ-ACK retransmission.

For mode 1, the base station may trigger HARQ-ACK retransmission through DCI format 0/4. For DCI format 0/4, the resource allocation control field therein contains

Bits of which

The number of resource blocks included in the uplink bandwidth is assumed to be 20MHz

The resource allocation control domain has

A bit. Whereas the states actually used by the resource allocation only need 100 × 101/2-5050, but 13 bits can represent 2^ 13-8192 different states, the rest unused states except 5050 to be used by the resource allocation can be used to indicate that the DCI is used to trigger HARQ-ACK retransmission. Meanwhile, the DCI can trigger the terminal to perform HARQ-ACK retransmission and can also indicate PUCCH resources used during retransmission. One of the ways of indicating PUCCH resources used by the existing protocols is to configure a plurality of PUCCH resources by a higher layer in combination with DCI dynamic indication, that is, to configure a plurality of PUCCH resources by a higher layer, and then dynamically indicate which one to use in DCI, specifically, dynamically indicate by a TPC (Transmit Power Control) in DCI, where the TPC in DCI does not need to adjust transmission Power. For a new PUCCH format, the resource indication method may be used, where the base station configures a plurality of new PUCCH resources for the terminal through high-layer signaling, and then indicates a resource used in retransmission through a preset control domain in DCI, where the preset control domain is preferably a TPC control domain. For the initial transmission of HARQ-ACK, the PUCCH resource is determined according to the TPC control field in the DCI related to downlink transmission, and for the retransmission of HARQ-ACK, since the DCI triggering the retransmission of HARQ-ACK is the DCI related to uplink transmission (DCI format 0/4 is the DCI related to uplink transmission), some control information contained in the DCI is unnecessary for the retransmission of HARQ-ACK, such as UL index/DL DAI, at this time, these control fields may be reused as the PUCCH resource indication field for the retransmission of HARQ-ACK, and the TPC control field may retain its original role and be used for adjusting transmission power. In this way, the base station only needs to make a reservation for a certain state or states in the resource allocation control domain by the terminal to indicate that the HARQ-ACK retransmission is triggered, and the influence on standardization is small.

Or, when the control field preset in the DCI is set to a specific state for instructing a terminal to perform HARQ-ACK retransmission, the remaining control fields of the DCI may be redefined, where the redefined control field includes at least one of:

a resource indication control field during the HARQ-ACK retransmission;

a transmission power control field when the HARQ-ACK is retransmitted;

and the modulation mode when the HARQ-ACK is retransmitted.

For the mode 2, when the terminal is configured with the RNTI supporting the HARQ-ACK retransmission mode, the base station also configures the RNTI special for the HARQ-ACK retransmission mode for the terminal, and the RNTI is different from the RNTI configured for the terminal in the prior art. The base station scrambles the DCI through the RNTI and then sends the DCI to the terminal, and the terminal descrambles the DCI through the RNTI to obtain corresponding information whether HARQ-ACK retransmission needs to be carried out or not, so that whether HARQ-ACK retransmission needs to be carried out or not is determined. In order to reduce the number of blind detections for the terminal, the size of the DCI is the same as the size of the existing DCI. In addition, considering the overhead problem of DCI, the DCI carrying the HARQ-ACK retransmission triggering adopts the smallest size in the existing DCI formats, such as DCI format 1C. Besides indication information for triggering HARQ-ACK retransmission, the DCI can also carry PUCCH channel resource indication information, such as 1-bit HARQ-ACK retransmission indication and 2-bit PUCCH channel resource indication. In addition, considering that the size of DCI format 1C is larger than the information required for HARQ-ACK retransmission, HARQ-ACK retransmission indication information of multiple terminals may be multiplexed on one DCI format 1C to be transmitted, multiple terminals share the same RNTI, different terminals configure different indexes to indicate where the terminal finds its corresponding HARQ-ACK retransmission indication information, fig. 10 is a schematic diagram of DCI design according to the preferred embodiment of the present invention.

Fig. 11 is a diagram illustrating an example of PDSCH retransmission according to a preferred embodiment of the present invention, as shown in fig. 11, after HARQ-ACK retransmission is supported, PDSCH transmission is performed, and HARQ-ACK transmission is performed as an example of PDSCH retransmission. In the case of the present example,

1. the base station sends PDSCH on a subframe 0 of a wireless frame n;

2. the terminal receives the PDSCH on a subframe 0 of a wireless frame and performs HARQ-ACK feedback on a subframe 4 of the wireless frame n according to a detection result;

3. the base station detects HARQ-ACK on a subframe 4 of a wireless frame n, judges that the transmission of the HARQ-ACK is wrong according to CRC, and sends downlink control information triggering the retransmission of the HARQ-ACK on a subframe 8 of the wireless frame n because the base station is configured with a retransmission mode supporting the HARQ-ACK, wherein the downlink control information is one of the modes described in the embodiment;

4. after receiving downlink control information which is sent by the terminal on a subframe 8 of a wireless frame n and triggers HARQ-ACK retransmission, the terminal determines that the HARQ-ACK retransmission is needed, and then the terminal retransmits the HARQ-ACK which is sent last time on a subframe 2 of the wireless frame n + 1;

5. the base station receives HARQ-ACK retransmission of the terminal on a subframe 2 of a wireless frame n +1, the base station can further combine initial transmission and retransmission of the HARQ-ACK, CRC passing is judged after combined detection, the base station obtains HARQ-ACK feedback of PDSCH transmission at the moment, and the PDSCH with the HARQ-ACK feedback being NACK is retransmitted on a subframe 6 of the wireless frame n + 1.

Compared with the preferred embodiment 1, the scheme can avoid unnecessary PDSCH retransmission, save resources and improve the spectrum efficiency. This scheme is particularly suitable for delay insensitive services.

It should be noted that, in the example shown in fig. 11, because the downlink HARQ employs asynchronous HARQ, the subframe in which the base station sends the downlink control information for triggering HARQ-ACK retransmission is not limited to the subframe 8 of the radio frame n, and in both the subframe 8 and the subframes thereafter, correspondingly, the subframe in which the terminal performs HARQ-ACK retransmission is determined according to the subframe in which the downlink control information for triggering HARQ-ACK retransmission by the base station is located, and assuming that the subframe in which the downlink control information for triggering HARQ-ACK retransmission by the base station is x, the subframe in which the terminal performs HARQ-ACK retransmission is x + K1, where K is a good value between the base station and the terminal, and K1 preferably takes 4. Similarly, because the downlink is asynchronous HARQ, the subframe for PDSCH retransmission by the base station is not limited to subframe 6 of radio frame n +1, and it is only required to transmit the subframe K2 subframes after the terminal transmits the HARQ-ACK subframe, and K2 preferably takes 4.

Preferred embodiment 5: example of not sending new packets or retransmitting packets to agree on retransmission mode

When a base station configures an HARQ-ACK sending mode of a terminal as a retransmission supporting mode, the base station performs receiving detection on the HARQ-ACK sent by the terminal in a first preset subframe, when CRC of the HARQ-ACK does not pass, the base station judges that the HARQ-ACK transmission has errors, and at the moment, the base station does not send a downlink retransmission data packet or a new data packet corresponding to the HARQ-ACK before a second preset subframe;

for the terminal side, because the downlink retransmission data packet or the new data packet corresponding to the HARQ-ACK is not received before the second preset subframe, at this time, two scenarios are included:

the first scenario is that the PDSCH received by the terminal is all correct, the base station also correctly receives the HARQ-ACK sent by the terminal, and the base station has no data for the terminal, so the base station does not send any signal to the terminal any more, and for this case, if the HARQ-ACK last sent by the terminal does not contain NACK, the terminal does not need to perform any operation either;

the second scenario is that the terminal receives the PDSCH in error, that is, the HARQ-ACK sent last time contains NACK, the terminal waits for the base station to perform PDSCH retransmission, and at this time, because the terminal does not receive the downlink retransmission data packet or new data packet corresponding to the HARQ-ACK before the second preset subframe, the terminal knows that the base station side determines that the received HARQ-ACK transmission is in error according to the convention, and therefore, the terminal repeatedly sends the HARQ-ACK on the third preset subframe according to the convention; the base station receives HARQ-ACK retransmission information sent by the terminal on a third preset subframe; the interval between the third subframe and the first subframe is defined by the base station and the terminal, the preferable value is 8 (subframes), and the preferable value of the second preset subframe is the previous subframe of the third preset subframe.

Fig. 12 is a schematic diagram of an example of not sending a new packet or retransmitting a packet to agree on a retransmission mode according to a preferred embodiment of the present invention, as shown in fig. 12, in which:

1. the base station sends PDSCH on a subframe 0 of a wireless frame n;

2. a terminal receives a PDSCH of a subframe 0 of a wireless frame n and sends HARQ-ACK corresponding to the PDSCH on a subframe 4 of the wireless frame n;

3. the base station receives HARQ-ACK sent by the terminal on a subframe 4 of a wireless frame n, and the base station judges that the HARQ-ACK transmission is wrong if the CRC of the detection result is wrong; the base station does not send a downlink retransmission data packet or a new data packet corresponding to the HARQ-ACK on the sub-frame 8 of the wireless frame n to the sub-frame 1 of the wireless frame n + 1; it is assumed here that the second predetermined subframe is subframe #1 of radio frame n + 1.

4. The terminal receives the downlink retransmission data packet or the new data packet which is sent by the base station on the subframe 8 of the wireless frame n to the subframe 1 of the wireless frame n +1 and corresponds to the HARQ-ACK, and retransmits the HARQ-ACK on the subframe 2 of the wireless frame n + 1;

According to the scheme, the base station and the terminal are well defined, and after the HARQ-ACK is sent for the first time, if the terminal does not receive the downlink retransmission data packet or the new data packet which is sent by the base station and corresponds to the HARQ-ACK sent for the first time within the preset time period, the terminal conducts HARQ-ACK retransmission on the preset subframe. For example, it is agreed that a downlink retransmission data packet or a new data packet corresponding to the HARQ-ACK which is sent for the first time is not received in 8 microseconds (8 subframes) after the HARQ-ACK is sent for the first time, and the terminal repeatedly sends the HARQ-ACK after 8 subframes, wherein the downlink retransmission data packet or the new data packet corresponding to the HARQ-ACK which is sent for the first time refers to downlink transmission having the same process number as the first-transmitted PDSCH.

In addition, if the base station does not receive the HARQ-ACK retransmission information sent by the terminal on the third preset subframe, it indicates that the terminal correctly receives the PDSCH, and only an error occurs in the HARQ-ACK transmission process, so the base station can consider that the last PDSCH terminal correctly receives and can start new data packet transmission.

Preferred embodiment 6:

fig. 13 is a schematic diagram of an example of a processing procedure of the terminal base station when the base station configures the HARQ-ACK transmission mode of the terminal as the repeat-combine retransmission mode according to the preferred embodiment of the present invention, as shown in fig. 13, in the example:

1. the base station sends PDSCH on a subframe 0 of a wireless frame n;

2. a terminal receives a PDSCH of a subframe 0 of a wireless frame n and sends HARQ-ACK corresponding to the PDSCH on a subframe 4 of the wireless frame n; due to the fact that the HARQ-ACK repeated transmission mode is enabled, and meanwhile, the repetition factor is assumed to be 2, the terminal repeatedly transmits the HARQ-ACK transmitted by the subframe 4 on the subframe 5 of the wireless frame n;

3. the base station receives HARQ-ACK sent by the terminal on a subframe 4 and a subframe 5 of a wireless frame n, and the base station judges that the HARQ-ACK transmission is wrong if the CRC of the detection result is wrong; because the base station is configured with a mode supporting HARQ-ACK retransmission, the base station sends downlink control information triggering HARQ-ACK retransmission on a subframe 9 of a radio frame n, where the downlink control information is one of the manners described in embodiment 4;

4. after receiving downlink control information which is sent by the terminal on a subframe 9 of a wireless frame n and triggers HARQ-ACK retransmission, the terminal determines that the HARQ-ACK retransmission is needed, and then the terminal retransmits the HARQ-ACK which is sent last time on a subframe 3 of the wireless frame n + 1; meanwhile, the HARQ-ACK repeated transmission mode of the terminal is also enabled, so that the terminal repeatedly transmits the HARQ-ACK transmitted by the subframe 3 on the subframe 4 of the wireless frame n + 1;

5. the base station receives HARQ-ACK retransmission of the terminal on a subframe 3 and a subframe 4 of a wireless frame n +1, the base station can further combine initial transmission and retransmission of the HARQ-ACK, CRC passing is judged after combined detection, the base station obtains HARQ-ACK feedback of PDSCH transmission at the moment, and the PDSCH with the HARQ-ACK feedback being NACK is retransmitted on a subframe 8 of the wireless frame n + 1.

Preferred embodiment 7:

fig. 14 is a diagram illustrating an example of a processing procedure of a base station of a terminal when the HARQ-ACK transmission mode of the base station configured with the terminal is the repeat-join retransmission mode, and fig. 14 shows an example of a processing procedure of a base station of a terminal when the HARQ-ACK transmission mode of the base station configured with the terminal is the repeat-join retransmission mode, in which the number of times of repeat transmission is increased relative to the number of times of repeat transmission of the previous HARQ-ACK, where the preferred number of times of increase is 1:

1. the base station sends PDSCH on a subframe 0 of a wireless frame n;

4. after receiving downlink control information which is sent by the terminal on a subframe 9 of a wireless frame n and triggers HARQ-ACK retransmission, the terminal determines that the HARQ-ACK retransmission is needed, and then the terminal retransmits the HARQ-ACK which is sent last time on a subframe 3 of the wireless frame n + 1; meanwhile, the HARQ-ACK repeated transmission mode of the terminal is enabled, and meanwhile, the terminal and the base station agree that the number of times of HARQ-ACK repeated transmission is increased by 1 time compared with the previous repeated transmission every time of HARQ-ACK retransmission, so that the terminal repeatedly transmits HARQ-ACK transmitted by a subframe 3 on a subframe 4 and a subframe 5 of a wireless frame n + 1;

5. the base station receives HARQ-ACK retransmission of the terminal on

subframes

3, 4 and 5 of a wireless frame n +1, the base station can further combine initial transmission and retransmission of the HARQ-ACK, the CRC is judged to pass after combined detection, the base station obtains HARQ-ACK feedback of PDSCH transmission at the moment, and the PDSCH with the HARQ-ACK feedback being NACK is retransmitted on subframe 9 of the wireless frame n + 1.

Preferred embodiment 8:

before the terminal sends the HARQ-ACK, the bit number of the HARQ-ACK and the HARQ-ACK bit sequence need to be determined. A way to determine the number of HARQ-ACK bits and the bit sequence is determined based on the configured serving cell number and transmission mode, and for the TDD system, it is further required to determine the number of downlink subframes that need to be fed back for an uplink subframe according to the configured downlink reference configuration. According to the method for determining the number of HARQ-ACK feedback bits according to the number of the configured serving cells, the number of the subframes and the transmission mode, when the number of the configured serving cells/subframes is large and the number of the actually scheduled serving cells/subframes is small, a large number of HARQ-ACKs need to be fed back, and many of the fed back HARQ-ACKs are useless, so that the transmission power of a terminal is wasted, and the performance of a base station for receiving the HARQ-ACK is influenced. Therefore, an improved scheme is to determine the number of HARQ-ACK bits to be fed back and the HARQ-ACK bit sequence according to the number of scheduled serving cells/subframes. In order to support the determination of the number of the fed-back HARQ-ACK bits and the HARQ-ACK bit sequence according to the number of the scheduled serving cells/subframes and avoid the condition that the base station and the terminal have different understandings about the sent HARQ-ACK, a corresponding mechanism is required to be introduced to solve the problem that the understandings of the base station of the terminal are inconsistent due to the missed detection of the terminal.

For this reason, the base station may carry Downlink Assignment Index (DAI) information in DCI related to PDSCH transmission, which is used to indicate a scheduling condition of the terminal on the downlink PDSCH, and further, the base station and the terminal agree, where meanings of the DAI indicated in different DCIs are different, where the different DCIs refer to DCIs of different serving cells or subframes, and specifically:

the base station indicates the number (accumulated value DAI) of the service cells which are scheduled by the current service cell according to a certain sequence through the DAI in the DCI of the first N-m service cells in the N scheduled service cells, and the DAI in the DCI of the last m service cells indicates the total number (total number DAI) of the service cells scheduled by the current subframe; or,

DAIs in DCIs of the (N-m) th serving cells repeatedly scheduled by DAIs in DCIs of the last m serving cells; or,

and DAIs in the DCIs of the last m serving cells and DAIs in the DCIs of the N-m serving cells to be scheduled have preset offset values which are the same, wherein N and m are positive integers, and m is a value agreed by the base station and the terminal.

The value of m is determined according to the bit number of the DAI control field, and if the DAI is 2 bits, the preferable value of m is 4. The reason for this is to assume that the case of missing 4 PDSCHs or (E) PDCCH indicating SPS (semi-persistent scheduling) release is not considered, so that the terminal can also recognize the missing case.

The correspondence between the DAI value and the number of the corresponding scheduled PDSCH/SPS release (E) PDCCH is shown in table 2.

TABLE 2

According to the above correspondence and scheduling conditions, when the DAI in the DCI of the previous N-m serving cells indicates the number of serving cells (accumulated value DAI) already scheduled by the current serving cell in a certain order, and the DAI in the DCI of the last m serving cells indicates the total number of serving cells (total number DAI) scheduled by the current subframe, the DAI values shown in table 3 can be obtained, as can be seen from fig. 16, when the terminal is not lost in the last 5(m +1, where m is equal to 4), the values of the last 5 received DAIs are the same, and therefore, it can be determined whether there is loss in the last 5 according to this: as long as the last received data is not the same as 5 consecutive DAI values, it can be determined that there is a loss in the last 5 data, but the terminal cannot determine which data is, and therefore, when the terminal feeds back HARQ-ACK, the state corresponding to the last 5 HARQ-ACK bits needs to be set as NACK. If the last 5 identical DAIs are received, which means that the last 5 are not lost, the ACK/NACK states corresponding to the last 5 HARQ-ACK bits may be determined according to the detection result. And for the states of other HARQ-ACK bit positions, determining the corresponding ACK/NACK states according to the accumulative counter and the detection result of the PDSCH.

TABLE 3

Fig. 15 is a first schematic diagram of a DAI according to a preferred embodiment of the present invention, as shown in fig. 15, in the schematic diagram, it is assumed that a base station configures 32 serving cells for a terminal, and schedules 29 serving cells on a subframe n, and the scheduling situation is shown in fig. 15. In the figure, the DAI value of each serving cell can determine the number of PDSCH/SPS release PDCCH corresponding to scheduling according to the correspondence shown in table 2.

For the terminal, as shown in table 3, when the terminal receives PDSCHs transmitted on all scheduled 29 serving cells or (E) PDCCHs indicating SPS release, the terminal indicates a total number of DAIs according to the last received 5 consecutive "00", where 4 are the DAIs indicating the total number, and the fifth last is the accumulated DAI, and according to the above receiving situation, the terminal may determine that the number of HARQ-ACK bits that need to be fed back is 29, determine the ACK/NACK state of the corresponding HARQ-ACK bit according to the previous accumulated DAI, and determine the corresponding ACK/NACK state according to the last detected 4 PDSCHs or (E) PDCCHs indicating SPS release for the last 4 HARQ-ACK bits.

For the terminal, fig. 16 is a diagram of a DAI according to a preferred embodiment of the present invention, fig. 17 is a diagram of a DAI according to a preferred embodiment of the present invention, as shown in fig. 16 and fig. 17, when the terminal receives 5 consecutive "00", for example, only 4 consecutive "00", the terminal can determine that one is lost, and cannot determine which is lost, if the terminal cannot distinguish the lost case as shown in fig. 16 from the lost case as shown in fig. 17, at this time, the terminal can determine the number of HARQ-ACK bits that need to be fed back to be 29 according to the last 4 "00" DAIs received and according to the DAIs representing the accumulated values before 4 "00", the terminal determines the ACK/NACK state of the, for the last 5 HARQ-ACK states, NACK is set.

The process that the terminal determines the corresponding HARQ-ACK bit number and the bit sequence according to the DAI is as follows:

when the terminal receives the first DAI with the value of '00', the terminal judges that the first PDSCH with the corresponding (E) PDCCH or the (E) PDCCH for indicating SPS release is scheduled by the base station, and simultaneously, the ACK/NACK state demodulated by the PDSCH is placed at the first position of an HARQ-ACK bit sequence, if the (E) PDCCH for indicating SPS release is received, the first position of the bit sequence is 'ACK';

when the terminal receives the first DAI with the value of 01, the terminal judges that the second PDSCH scheduled by the base station has the corresponding (E) PDCCH or the (E) PDCCH for indicating SPS release, simultaneously puts the ACK/NACK state demodulated by the PDSCH at the second position of the HARQ-ACK bit sequence, and if the (E) PDCCH for indicating SPS release is received, sets the second position of the bit sequence as ACK;

when the terminal receives the first DAI with the value of '10', the terminal judges that the first DAI is the third PDSCH with the corresponding (E) PDCCH or the (E) PDCCH for indicating SPS release scheduled by the base station, and simultaneously, the ACK/NACK state demodulated by the PDSCH is placed at the third position of the HARQ-ACK bit sequence, if the (E) PDCCH for indicating SPS release is received, the third position of the bit sequence is 'ACK';

when the terminal receives the first DAI with the value of '11', the terminal judges that the first DAI is the fourth PDSCH with the corresponding (E) PDCCH or the (E) PDCCH for indicating SPS release scheduled by the base station, simultaneously puts the ACK/NACK state demodulated by the PDSCH at the fourth bit of the HARQ-ACK bit sequence, and if the first DAI is the (E) PDCCH for indicating SPS release, the fourth bit of the bit sequence is 'ACK';

when the terminal receives the second DAI with the value of '00', the terminal judges that the second DAI is the fifth PDSCH with the corresponding (E) PDCCH or the (E) PDCCH for indicating SPS release scheduled by the base station, simultaneously puts the ACK/NACK state demodulated by the PDSCH at the fifth position of the HARQ-ACK bit sequence, and if the (E) PDCCH for indicating SPS release is received, sets the fifth position of the bit sequence as 'ACK';

when the terminal receives the second DAI with the value of 01, the terminal judges that the data is the sixth PDSCH which is scheduled by the base station and has the corresponding (E) PDCCH or the (E) PDCCH for indicating SPS release, and simultaneously, the ACK/NACK state demodulated by the PDSCH is placed at the sixth position of the HARQ-ACK bit sequence, if the data is the (E) PDCCH for indicating SPS release, the sixth position of the bit sequence is 'ACK';

when the terminal receives the second DAI with the value of '10', the terminal judges that the second DAI is the seventh PDSCH with the corresponding (E) PDCCH or the (E) PDCCH for indicating SPS release scheduled by the base station, simultaneously puts the ACK/NACK state demodulated by the PDSCH at the seventh position of the HARQ-ACK bit sequence, and if the (E) PDCCH for indicating SPS release is received, sets the seventh position of the bit sequence as 'ACK';

when the terminal receives the second DAI with the value of '11', the terminal judges that the second DAI is the eighth PDSCH with the corresponding (E) PDCCH or the (E) PDCCH for indicating SPS release scheduled by the base station, simultaneously puts the ACK/NACK state demodulated for the PDSCH at the eighth bit of the HARQ-ACK bit sequence, and sets the eighth bit of the bit sequence as 'ACK' if the (E) PDCCH for indicating SPS release is received;

and so on;

for the case of receiving the last five identical DAIs, as in the embodiment of fig. 15, the values of the received last 5 DAIs are all "00", it can be determined from the previous receiving case that the fifth last DAI represents that 25 PDSCHs with corresponding (E) PDCCHs have been scheduled or (E) PDCCHs indicating SPS release have been received, and then for the last 4 DAIs representing the total number, the value is "00", and table look-up 2 can determine that 29 PDSCHs with corresponding (E) PDCCHs or PDCCHs indicating SPS release have been scheduled. If the current sub-frame has a serving cell for transmitting the SPS, mapping the ACK/NACK state corresponding to the PDSCH of the SPS serving cell to the end of the HARQ-ACK bit sequence according to the carrier index sequence, and finally obtaining a schematic diagram as shown in fig. 18, where, assuming that the received PDSCHs are all demodulated correctly, the HARQ-ACK state is both ACK and is represented by "a" in the diagram, and for the serving cell missed detection, the HARQ-ACK state is represented by "X" in the diagram, and is set as NACK and is represented by "N" in the diagram, and in addition, in the schematic diagram, since 5 identical DAI values are received last, the terminal determines that there are last 5 PDSCHs corresponding to the (E) PDCCH or PDCCHs indicating SPS release and thus the corresponding HARQ-ACK state is not lost, and determines according to the demodulation result of the PDSCH, it is assumed here that the PDSCH is demodulated correctly. If the receiving condition is as shown in fig. 19, the terminal only receives 4 same DAIs at last, the terminal may determine that there is one missing PDSCH corresponding to the corresponding (E) PDCCH or PDCCH indicating SPS release in the last 5 PDCCHs or PDCCHs indicating SPS release, but it is unknown which missing is specific, so the terminal will set the HARQ-ACK status of the last 5 (without considering SPS) as NACK, and if the current subframe has a serving cell transmitting SPS, the process is as described above.

According to the above correspondence, and the scheduling case, when the DAI in the DCI of the preceding N-m serving cells indicates the number of serving cells (accumulated value DAI) that have been scheduled by the current serving cell in a certain order, and the DAI in the DCI of the N-m serving cell where the DAI in the DCI of the last m serving cells is repeatedly scheduled is the DAI in the DCI of the N-m serving cell, it is assumed that m is 3, when the terminal has not lost in the last 4(m +1, where m is equal to 4), the values of the last 4 received DAIs are the same, and therefore, it can be determined whether there is loss in the last 4 according to this: as long as the last received data is not the same as 4 consecutive DAI values, it can be determined that there is a loss in the last 4, but the terminal cannot determine which one is specific, so that when the terminal feeds back HARQ-ACK, the state corresponding to the last 4 HARQ-ACK bits needs to be set as NACK. If the last 4 identical DAIs are received, which means that the last 4 are not lost, the ACK/NACK states corresponding to the last 4 HARQ-ACK bits can be determined according to the detection result. And for the states of other HARQ-ACK bit positions, determining the corresponding ACK/NACK states according to the accumulative counter and the detection result of the PDSCH.

The terminal determines the number of HARQ-ACK bits according to the DAI, specifically, as follows, the number of HARQ-ACK bits to be fed back is determined according to the scheduling condition received before and the value of the continuously same DAI received last, as shown in fig. 20, the value of the continuously received 4 same DAIs is "00", 25 scheduled ones are determined by looking up table 2, and then the terminal determines that the number of PDSCHs having the corresponding (E) PDCCH or the number of PDCCHs indicating SPS release is 25+3 to 28 due to the fact that the DAI of the last 3 serving cells agreed with the base station is the same as the previous one. Since 4 identical DAI values are received at last, the terminal judges that the last 4 PDSCHs corresponding to the corresponding (E) PDCCH or PDCCHs indicating SPS release are not lost, and thus, the corresponding HARQ-ACK state is determined according to the demodulation result of the PDSCH, where it is assumed that the PDSCHs are all demodulated correctly. If the receiving condition is as shown in fig. 21, the terminal only receives 3 identical DAIs at last, the terminal may determine that there is one missing PDSCH corresponding to the corresponding (E) PDCCH or PDCCH indicating SPS release in the last 4 PDCCHs, but it is unknown which missing PDCCH is, so the terminal may set the HARQ-ACK status of the last 4 (without considering SPS) as NACK, and if the current subframe has a serving cell transmitting SPS, the process is as described above.

Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.

It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in a plurality of processors.

The embodiment of the invention also provides a storage medium. Optionally, in this embodiment, the storage medium may be configured to store program codes for executing the method steps of the above embodiment:

optionally, in this embodiment, the storage medium may include, but is not limited to: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.

Optionally, in this embodiment, the processor executes the method steps of the above embodiments according to the program code stored in the storage medium.

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

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

Claims

1. A method for transmitting response information, comprising:

the base station receives HARQ-ACK sent by the terminal according to the sending mode;

wherein the transmission mode of the HARQ-ACK comprises at least one of the following modes: a normal transmission mode; repeating the transmission mode; support for a retransmission mode;

the base station configures the transmission mode of the hybrid automatic repeat request acknowledgement message HARQ-ACK of the terminal, and the transmission mode comprises at least one of the following modes: the base station and the terminal appoint a default mode as the retransmission supporting mode; the base station indicates the sending mode of the terminal to be one of the sending modes through a first configuration parameter of a high-level signaling; the base station indicates the retransmission supporting mode through a second configuration parameter of a high-level signaling; and the base station indicates the repeated sending mode through a third configuration parameter of a high-level signaling.

2. The method of claim 1, comprising:

the second configuration parameter is a newly added parameter, and the third configuration parameter is a newly added parameter, or the third configuration parameter is a parameter of a related protocol.

3. The method of claim 1, comprising:

and when the base station configures the HARQ-ACK sending mode of the terminal as the repeated sending mode, the base station configures the number of times of repeated sending of the HARQ-ACK and the resources used during the repeated sending.

4. The method of claim 1, wherein when the base station configures the HARQ-ACK transmission mode of the terminal as the retransmission supported mode, the base station transmits downlink control information instructing the terminal to perform HARQ-ACK retransmission, and the downlink control information includes at least one of:

and the base station indicates the terminal to perform HARQ-ACK retransmission through downlink control information DCI sent on a physical downlink control channel PDCCH or an enhanced physical downlink control channel EPDCCH.

5. The method of claim 4, comprising:

when the base station instructs the terminal to perform HARQ-ACK retransmission through NACK on the PHICH, the resources of the PHICH are determined according to the resources carrying the HARQ-ACK;

6. The method of claim 5, comprising:

the control field indicated in the DCI, in addition to the control field for indicating HARQ-ACK retransmission, further includes at least one of:

a resource indication control field during the HARQ-ACK retransmission;

a transmission power control field when the HARQ-ACK is retransmitted;

and the modulation mode when the HARQ-ACK is retransmitted.

7. The method of claim 1, comprising:

when the base station configures the HARQ-ACK sending mode of the terminal to be the retransmission supporting mode, the base station receives the HARQ-ACK sent by the terminal for the first time on a first preset subframe;

8. The method of claim 1, comprising:

when the base station is configured with a HARQ-ACK repeated transmission mode and HARQ-ACK repeated transmission mode enabling at the same time, the base station and the base station agree, and the repeated transmission times are increased relative to the previous transmission times during the HARQ-ACK retransmission.

9. The method of any one of claims 4 to 6, comprising:

when the configuration of HARQ-ACK is transmitted on a physical downlink control channel PUCCH, the DCI is transmitted on a main downlink component carrier;

10. The method of claim 1, comprising:

and the base station carries Downlink Allocation Index (DAI) information in the DCI, wherein the DAI information is used for determining the HARQ-ACK sent by the terminal.

11. The method of claim 10, comprising:

the DAI information is a control domain newly added in the DCI or an existing control domain, and the meaning of the DAI information in different DCIs is different, wherein the different DCIs refer to DCIs of different serving cells or subframes.

12. The method of claim 11, comprising:

the base station is used for indicating the number of the service cells which are scheduled by the current service cell according to a certain sequence through DAIs in DCIs of the first N-m service cells in the N scheduled service cells, and the DAIs in DCIs of the last m service cells indicate the total number of the service cells scheduled by the current subframe; or,

13. A method for transmitting response information, comprising:

the terminal determines the transmission mode of the HARQ-ACK;

the terminal sends HARQ-ACK to the base station through the sending mode;

the terminal determines that the transmission mode of the HARQ-ACK comprises at least one of the following modes: the terminal and the base station agree that a default mode is the retransmission supporting mode; the base station indicates the sending mode of the terminal to be one of the sending modes through a first configuration parameter of a high-level signaling; the base station indicates the retransmission supporting mode through a second configuration parameter of a high-level signaling; and the base station indicates the repeated sending mode through a third configuration parameter of a high-level signaling.

14. The method of claim 13, comprising:

the second configuration parameter is a newly added configuration parameter, and the third configuration parameter is a newly added configuration parameter, or the third configuration parameter is a configuration parameter of a related protocol.

15. The method of claim 13, comprising:

and when the HARQ-ACK transmission mode is determined to be the repeated transmission mode, the terminal repeatedly transmits the HARQ-ACK on continuous uplink subframes by adopting resources configured by a high layer, wherein the number of the continuous uplink subframes is configured by the high layer.

16. The method of claim 13, comprising:

and when the HARQ-ACK sending mode is determined to be the retransmission supporting mode, the terminal receives downlink control information which is sent by the base station and indicates the terminal to carry out HARQ-ACK retransmission, and the terminal determines whether to carry out HARQ-ACK retransmission according to the downlink control information.

17. The method of claim 16, comprising:

the terminal receives downlink control information which is sent by the base station and indicates the terminal to carry out HARQ-ACK retransmission, and the downlink control information comprises at least one of the following information:

the terminal receives DCI transmitted on PDCCH or EPDCCH.

18. The method of claim 16, comprising:

when the terminal receives NACK on the PHICH, the terminal performs HARQ-ACK retransmission;

19. The method of claim 18, comprising:

a resource indication control field during the HARQ-ACK retransmission;

a transmission power control field when the HARQ-ACK is retransmitted;

and the modulation mode when the HARQ-ACK is retransmitted.

20. The method of claim 16, comprising:

and the terminal descrambles the DCI by adopting a special RNTI and acquires HARQ-ACK retransmission information related to the terminal according to the index information configured by the high layer.

21. The method of claim 16, comprising:

and when the downlink control information indicates that the terminal needs to perform HARQ-ACK retransmission, the terminal performs HARQ-ACK retransmission on a third preset uplink subframe.

22. The method of claim 13, comprising:

and when the HARQ-ACK sending mode is determined to be a retransmission supporting mode, the terminal does not receive a downlink retransmission data packet or a new data packet which is sent by the base station and corresponds to the HARQ-ACK before a second preset subframe, and the HARQ-ACK information sent by the terminal at the previous time contains NACK, and the terminal retransmits the HARQ-ACK on a third preset uplink subframe.

23. The method according to claim 21 or claim 22, wherein the terminal performs HARQ-ACK retransmission on a third preset uplink subframe, comprising at least one of:

24. The method of claim 13, comprising:

when the HARQ-ACK sending mode is determined to be the combined mode of the supported retransmission mode and the repeated sending mode, the terminal firstly repeatedly sends the HARQ-ACK on resources which are configured by a high layer on continuous uplink subframes, wherein the number of the continuous uplink subframes is configured by the high layer, then carries out subsequent processing on the supported retransmission mode according to the HARQ-ACK sending mode, and carries out repeated sending processing when the terminal needs to send the HARQ-ACK.

25. The method of claim 13, comprising:

when the HARQ-ACK transmission mode is determined to be the combined mode of the retransmission supporting mode and the repeated transmission mode, the base station appoints the number of repeated transmission times to be increased relative to the number of previous transmission times when the terminal performs HARQ-ACK retransmission according to the appointment with the base station.

26. The method of claim 13, comprising:

before the terminal sends HARQ-ACK to the base station, the number of HARQ-ACK bits needing to be fed back and the fed-back HARQ-ACK bit sequence are determined.

27. The method of claim 26, wherein:

and the terminal determines the number of HARQ-ACK bits needing to be fed back and the HARQ-ACK bit sequence needing to be fed back according to the DAI sent by the base station.

28. The method of claim 27, comprising:

29. The method of claim 28, comprising:

the terminal ends to the number of the service cells already scheduled by the current service cell according to the DAI indication in the DCI of the first N-m service cells in the N scheduled service cells in a certain sequence according to the agreement with the base station, and the DAI in the DCI of the last m service cells indicates the total number of the service cells scheduled by the current subframe; or,

30. An apparatus for transmitting response information in a base station, comprising:

a receiving module, configured to receive, by the base station, HARQ-ACK sent by the terminal according to the sending mode;

the configuration module includes at least one of: a first configuration unit, configured to enable the terminal and the base station to agree that a default mode is the retransmission support mode; a second configuration unit, configured to indicate, by the base station, through a first configuration parameter of a higher layer signaling that a transmission mode of the terminal is one of the transmission modes; a third configuration unit, configured to indicate, by the base station, the retransmission mode is supported through a second configuration parameter of a high-level signaling; a fourth configuration unit, configured to indicate, by the base station, the repeated transmission mode through a third configuration parameter of a higher layer signaling.

31. A base station, comprising: the device of claim 30.

32. An apparatus for transmitting a response message in a terminal, comprising:

a sending module, configured to send HARQ-ACK to a base station through the sending mode by the terminal;

the determining module comprises at least one of: a first determining unit, configured to enable the terminal and the base station to agree that a default mode is the retransmission support mode; a second determining unit, configured to indicate, by the base station, through a first configuration parameter of a higher layer signaling that a transmission mode of the terminal is one of the transmission modes; a third determining unit, configured to indicate, by the base station, the retransmission mode is supported through a second configuration parameter of a higher layer signaling; a fourth determining unit, configured to indicate, by the base station, the repeated transmission mode through a third configuration parameter of a higher layer signaling.

33. A terminal, comprising: the apparatus of claim 32.