CN107733475B

CN107733475B - Method and device for determining feedback codebook

Info

Publication number: CN107733475B
Application number: CN201610666417.0A
Authority: CN
Inventors: 司倩倩; 高雪娟; 潘学明
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2016-08-12
Filing date: 2016-08-12
Publication date: 2021-06-18
Anticipated expiration: 2036-08-12
Also published as: WO2018028435A1; CN107733475A

Abstract

The invention provides a method and a device for determining a feedback codebook, and belongs to the technical field of communication. The method for determining the feedback codebook comprises the following steps: and the communication terminal determines the size of the feedback codebook according to one or more parameters of the maximum feedback window size M, the minimum feedback time delay k, the TTI length which can be transmitted on the carrier wave, the number of the TTI lengths which can be transmitted and the TTI length for bearing the feedback information corresponding to each TTI length. By the technical scheme of the invention, the base station and the communication terminal can determine the size of the ACK/NACK codebook when the feedback position is flexibly notified by the base station.

Description

Method and device for determining feedback codebook

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for determining a feedback codebook.

Background

With the development and change of the mobile communication service demand, a plurality of organizations such as ITU (International Telecommunications Union) define higher user plane delay performance requirements for future mobile communication systems. One of the main methods to shorten the user Time-delay performance is to reduce the TTI (Transmission Time Interval) length. When the TTI of the traffic channel is shortened, ACK (acknowledgement)/NACK (negative acknowledgement) feedback of downlink data may indicate a specific feedback position through downlink scheduling signaling.

For single carrier transmission, a bundling or multiplexing scheme is used for feedback in an LTE (Long Term Evolution) system, and a 1-bit or 2-bit ACK/NACK feedback codebook is generated according to different situations.

For multi-carrier transmission, in the LTE system, a scheme of PUCCH (Physical Uplink Control CHannel) format1b with CHannel selection or PUCCH format 3/4/5 is used for feedback, and when PUCCH format1b with CHannel selection is used for feedback, a 1-bit or 2-bit ACK/NACK feedback codebook is generated according to different situations; when PUCCH format 3 is used for feedback, a fixed ACK/NACK feedback codebook size is generated according to the size of a feedback window, the number of configured carriers and the transmission mode of the carriers; when the PUCCH format 4/5 is used for feedback, fixed and dynamic feedback codebook sizes are supported, when the fixed codebook size is used, a fixed ACK/NACK feedback codebook size is generated according to the size of a feedback window, the number of configured carriers and the transmission mode of the carriers, when the dynamic codebook size is used, a 2-bit counter DAI is used in a downlink scheduling signaling for indicating the number of scheduling subframes/carriers, and a 2-bit total DAI is used for indicating the total number of scheduling subframes/carriers up to the current subframe, and both the base station and the communication terminal determine the size of a final feedback codebook according to the counter DAI and the total DAI.

In the LTE system, since the feedback window position is known, both the base station and the communication terminal can determine the feedback codebook size according to the feedback window position. However, if the system uses dynamic signaling to notify the ACK/NACK feedback position of the downlink data, the feedback window position is unknown to the communication terminal, and the communication terminal cannot know the size of the feedback window in advance, and thus cannot determine the size of the feedback codebook.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a method and an apparatus for determining a feedback codebook, which can enable a base station and a communication terminal to determine the size of an ACK/NACK codebook when a feedback position is flexibly notified by the base station.

To solve the above technical problem, embodiments of the present invention provide the following technical solutions:

in one aspect, a method for determining a feedback codebook is provided, including:

and the communication terminal determines the size of the feedback codebook according to one or more parameters of the maximum feedback window size M, the minimum feedback time delay k, the TTI length which can be transmitted on the carrier wave, the number of the TTI lengths which can be transmitted and the TTI length for bearing the feedback information corresponding to each TTI length.

Further, the maximum feedback window size M is a predefined value or a value determined through signaling interaction with other communication terminals; or

And the maximum feedback window size M is obtained by the communication terminal according to the bit number of the indication feedback time delay M defined in the downlink scheduling signaling.

Further, the minimum feedback delay k is a predefined value.

Further, the determining, by the communication terminal, the size of the feedback codebook according to one or more parameters of a maximum feedback window size M, a minimum feedback delay k, a TTI length that can be transmitted on a carrier, the number of TTI lengths that can be transmitted, and a TTI length that carries feedback information, which correspond to each TTI length, includes:

when only TTI with one length exists on a carrier wave, determining the size of a feedback codebook on the carrier wave according to the maximum feedback window size M and the transmission mode of the carrier wave; or

When TTI with various lengths exists on a carrier wave, for each TTI length, determining the size of a feedback codebook corresponding to the TTI length according to the maximum feedback window size M corresponding to each TTI length and the transmission mode of the carrier wave, and taking the sum of the sizes of the feedback codebooks corresponding to different TTI lengths as the size of the feedback codebook on the carrier wave; or

When TTI with various lengths exists on a carrier wave, for each TTI length, determining the position of a corresponding feedback window according to the maximum feedback window size M corresponding to each TTI length, the minimum feedback delay k and the TTI length for bearing feedback information, and if the positions of the feedback windows corresponding to different TTI lengths are not overlapped, taking the sum of the sizes of feedback codebooks corresponding to different TTI lengths as the size of the feedback codebook on the carrier wave; otherwise, the size of the feedback codebook is determined according to the shortest TTI length in the overlapped part, and the size of the feedback codebook is determined according to the TTI length in the non-overlapped part.

Further, in the time division duplex system, the feedback information bit corresponding to the TTI determined as the uplink transmission in the feedback window is subtracted to obtain the size of the feedback codebook.

Further, the communication terminal is a terminal, and after determining the size of the feedback codebook, the method further includes:

generating feedback information according to the size of the determined feedback codebook, and sending the feedback information to the base station at the corresponding feedback position; or

The communication terminal is a base station, and after determining the size of the feedback codebook, the method further comprises:

and receiving feedback information sent by the terminal at the corresponding feedback position according to the determined size of the feedback codebook.

Further, the generating feedback information according to the determined size of the feedback codebook and sending the feedback information to the base station at the corresponding feedback position includes:

and determining a feedback position corresponding to each sTTI according to k sTTI + m sTTI, wherein k is the minimum feedback delay corresponding to the sTTI, m is the indication feedback delay corresponding to the sTTI, and the sTTI is the actual length of the downlink data TTI needing to be fed back or the minimum TTI length capable of being transmitted on a carrier wave.

when single carrier transmission is carried out and only TTI with one length exists on a carrier, sequencing a feedback codebook according to the front and back sequence of the TTI in a feedback window, and supplementing NACK/DTX to the TTI which does not receive information at the corresponding position to obtain feedback information;

when a single carrier is transmitted and TTI with various lengths exist on a carrier, for TTI with various lengths, sequencing a feedback codebook according to TTI in a feedback window, supplementing NACK/DTX to the TTI without information at a corresponding position, and then cascading feedback information corresponding to TTI with different lengths according to a cascading sequence to generate feedback information, wherein the base station and the terminal determine the cascading sequence of the feedback information of TTI with different lengths according to a predefined mode;

when a single carrier wave is transmitted and TTI with various lengths exist on a carrier wave, for TTI with various lengths, sequencing a feedback codebook according to TTI in a feedback window in sequence, supplementing NACK/DTX to the TTI without information at a corresponding position, and if the positions of the feedback windows corresponding to different TTI lengths are not overlapped, cascading the feedback information corresponding to different TTI lengths according to a cascading sequence;

when a single carrier wave is transmitted and TTI with various lengths exist on a carrier wave, for TTI with various lengths, sequencing a feedback codebook according to TTI in a feedback window in sequence, supplementing NACK/DTX to the TTI without information at a corresponding position, if positions of the feedback windows corresponding to different TTI lengths are overlapped and the actually transmitted part which is overlapped is the shortest TTI length, generating feedback information according to the shortest TTI, and if the actually transmitted part which is overlapped is not the shortest TTI length and the not the shortest TTI length contains x shortest TTI lengths, repeating the feedback information corresponding to the not the shortest TTI length for x times to obtain the feedback information of the overlapped part; or, the feedback information corresponding to the TTI length which is not the shortest is taken as the first feedback information, and the rest positions supplement NACK/DTX; generating feedback information according to the TTI length of actual transmission at the non-overlapping part;

and during single carrier transmission, sequencing the feedback codebook according to the downlink allocation index DAI indicated in the downlink scheduling signaling to generate feedback information, and supplementing NACK/DTX at the end of the feedback information until the determined size of the feedback codebook is met.

Further, in multi-carrier transmission, feedback information is generated for each carrier by using the method as described above, and the generated feedback information is concatenated as a feedback codebook to be sent to the base station.

The embodiment of the present invention further provides a device for determining a feedback codebook, including:

and the processing module is used for determining the size of the feedback codebook according to one or more parameters of the maximum feedback window size M, the minimum feedback time delay k, the TTI length which can be transmitted on the carrier wave, the number of the TTI lengths which can be transmitted and the TTI length for bearing the feedback information corresponding to each TTI length.

The maximum feedback window size M is obtained by the processing module according to the bit number indicating the feedback delay M defined in the downlink scheduling signaling.

Further, the minimum feedback delay k is a predefined value.

Further, the processing module is specifically configured to determine, when only one TTI of length exists on a carrier, a size of a feedback codebook on the carrier according to a maximum feedback window size M and a transmission mode of the carrier; or

Further, in the tdd system, the processing module is configured to subtract a feedback information bit corresponding to the TTI determined as the uplink transmission in the feedback window to obtain a size of the feedback codebook.

Further, the determining apparatus is applied to a terminal, and the apparatus further includes:

the feedback module is used for generating feedback information according to the size of the determined feedback codebook and sending the feedback information to the base station at the corresponding feedback position;

the determination apparatus is applied to a base station, and the apparatus further includes:

and the receiving module is used for receiving the feedback information sent by the terminal at the corresponding feedback position according to the determined size of the feedback codebook.

Further, the feedback module is specifically configured to determine a feedback position corresponding to each sTTI according to k × sTTI + m × sTTI, where k is a minimum feedback delay corresponding to the sTTI, m is an indication feedback delay corresponding to the sTTI, and the sTTI is an actual length of a downlink data TTI that needs to be fed back or a minimum TTI length that can be transmitted on a carrier.

Further, the feedback module is specifically configured to, when the single carrier transmission is performed and only one TTI of length exists on the carrier, sort the feedback codebook according to the order of the TTIs in the feedback window, and supplement NACK/DTX to the TTI that does not receive information at the corresponding position to obtain the feedback information;

Further, during multi-carrier transmission, the feedback module is configured to generate feedback information for each carrier, and concatenate the generated feedback information to serve as a feedback codebook sent to the base station.

The embodiment of the invention also provides a method for determining the feedback codebook, which comprises the following steps:

the communication terminal determines the size of a feedback codebook according to predefined information or configuration information, wherein the configuration information indicates the size of a feedback window on one or more carriers, and the feedback window transmits data with one or more TTI lengths.

Further, the downlink scheduling signaling corresponding to the TTI transmitted in the feedback window carries a downlink assignment index DAI.

Further, the communication terminal is a terminal, the configuration information is issued to the terminal by the base station, and after the size of the feedback codebook is determined, the method further includes:

generating feedback information according to the size of the determined feedback codebook, and sending the feedback information to the base station at the corresponding feedback position;

and during single carrier transmission, sequencing the feedback codebook according to the DAI indicated in the downlink scheduling signaling to generate feedback information, and supplementing NACK/DTX at the end of the feedback information until the determined size of the feedback codebook is met.

and the processing module is used for determining the size of a feedback codebook according to predefined information or configuration information issued by the base station, wherein the configuration information indicates the size of a feedback window on one or more carriers, and the feedback window transmits data with one or more TTI lengths.

Further, the determining apparatus is applied to a terminal, and the configuration information is issued by the base station to the terminal, and the apparatus further includes:

Further, the feedback module is specifically configured to, during single carrier transmission, sort the feedback codebook according to the DAI indicated in the downlink scheduling signaling to generate feedback information, and supplement NACK/DTX at the end of the feedback information until the determined size of the feedback codebook is satisfied.

The embodiment of the invention has the following beneficial effects:

in the above scheme, the size of the feedback codebook is determined according to one or more of the information such as the maximum feedback window size M, the minimum feedback delay k, the number of TTIs that can be transmitted and the number of TTIs that can be transmitted on a carrier, and the TTI length that carries feedback information, or the size of the feedback window is directly determined according to predefined or configuration information, so that the base station and the communication terminal can determine the size of the ACK/NACK codebook when the feedback position is flexibly notified by the base station, and the misinterpretation of the size of the ACK/NACK codebook between the base station and the terminal is avoided.

Drawings

FIG. 1 is a flowchart illustrating a method for determining a feedback codebook according to an embodiment of the present invention;

FIG. 2 is a flowchart illustrating a method for determining a feedback codebook according to another embodiment of the present invention;

FIG. 3 is a flowchart illustrating a method for determining a feedback codebook according to another embodiment of the present invention;

FIG. 4 is a block diagram of a device for determining a feedback codebook according to an embodiment of the present invention;

FIG. 5 is a block diagram illustrating a determining apparatus of a feedback codebook according to another embodiment of the present invention;

FIG. 6 is a block diagram of a feedback codebook determining apparatus according to another embodiment of the present invention;

FIG. 7 is a flowchart illustrating a method for determining a feedback codebook according to an embodiment of the present invention;

FIG. 8 is a flowchart illustrating a method for determining a feedback codebook according to another embodiment of the present invention;

FIG. 9 is a flowchart illustrating a method for determining a feedback codebook according to another embodiment of the present invention;

FIG. 10 is a block diagram illustrating an apparatus for determining a feedback codebook according to an embodiment of the present invention;

FIG. 11 is a block diagram illustrating a determining apparatus of a feedback codebook according to another embodiment of the present invention;

FIG. 12 is a block diagram illustrating a structure of an apparatus for determining a feedback codebook according to another embodiment of the present invention;

FIG. 13 is a diagram of single carrier transmission with only one TTI length on the carrier according to embodiment 1 of the present invention;

fig. 14 is a schematic diagram of single carrier transmission and simultaneous TTI transmissions of two lengths on a carrier according to embodiment 2 of the present invention, where feedback windows of the TTIs of the two lengths do not overlap;

fig. 15 is a schematic diagram of single carrier transmission and simultaneous TTI transmissions of two lengths on a carrier according to embodiment 3 of the present invention, where feedback windows of the TTIs of the two lengths overlap;

fig. 16 is a schematic diagram of single carrier transmission and simultaneous TTI transmissions of two lengths on a carrier according to embodiment 4 of the present invention, where feedback windows of the TTIs of the two lengths do not overlap;

fig. 17 is a schematic diagram of single carrier transmission and simultaneous transmission of TTIs with two lengths on a carrier according to embodiment 5 of the present invention, where feedback windows of the TTIs with the two lengths do not overlap.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

The embodiment of the invention provides a method and a device for determining a feedback codebook, which can enable a base station and a communication terminal to determine the size of an ACK/NACK codebook when a feedback position is flexibly notified by the base station.

The present embodiment provides a method for determining a feedback codebook, as shown in fig. 1, the present embodiment includes:

step 101: and the communication terminal determines the size of the feedback codebook according to one or more parameters of the maximum feedback window size M, the minimum feedback time delay k, the TTI length which can be transmitted on the carrier wave, the number of the TTI lengths which can be transmitted and the TTI length for bearing the feedback information corresponding to each TTI length.

In this embodiment, the size of the feedback codebook is determined according to one or more of the information, such as the maximum feedback window size M, the minimum feedback delay k, the number of TTIs that can be transmitted and the number of TTIs that can be transmitted on a carrier, and the TTI length that carries feedback information, so that the base station and the communication terminal can determine the size of the ACK/NACK codebook when the feedback position is flexibly notified by the base station, thereby avoiding misinterpretation of the size of the ACK/NACK codebook between the base station and the terminal.

Further, the maximum feedback window size M is the maximum possible number of downlink TTIs of the same length that are fed back in the same uplink TTI. The maximum feedback window size M is a predefined value or a value determined by signaling interaction with other communication terminals; or

The maximum feedback window size M is obtained by the communication terminal according to a bit number indicating a feedback delay M defined in the downlink scheduling signaling, for example, M corresponding to M of 2 bits is defined as 4, M corresponding to M of 3 bits is defined as 8, and TTIs of different lengths may correspond to different M values.

Further, the minimum feedback delay k is a minimum processing time from the downlink data scheduled by the downlink scheduling signaling to a feedback information transmission position corresponding to the downlink data, the minimum feedback delay k is a predefined value, and TTIs with different lengths may correspond to different k values.

Further, the TTI length that can be transmitted simultaneously on the carrier is 14 symbols and/or 7 symbols and/or 2 symbols.

Further, the TTI length for carrying feedback information may be 14 symbols and/or 7 symbols and/or 4 symbols and/or 2 symbols.

In a specific embodiment, after the communication terminal is a terminal and determines the size of the feedback codebook, as shown in fig. 2, the method further includes:

step 102: and generating feedback information according to the size of the determined feedback codebook, and sending the feedback information to the base station at the corresponding feedback position.

In another specific embodiment, after the communication terminal is a base station and determines the size of the feedback codebook, as shown in fig. 3, the method further includes:

step 103: and receiving feedback information sent by the terminal at the corresponding feedback position according to the determined size of the feedback codebook.

and during single carrier transmission, sequencing the feedback codebook according to the downlink allocation index DAI indicated in the downlink scheduling signaling to generate feedback information, and supplementing NACK/DTX at the end of the feedback information until the determined size of the feedback codebook is met. The DAI is a TTI number scheduled in a feedback window, and the used bit number is determined according to the size of the actual feedback window; alternatively, the DAI may be a 2-bit time-domain counter, which is used cyclically.

An embodiment of the present invention further provides a device for determining a feedback codebook, as shown in fig. 4, including:

the processing module 21 is configured to determine the size of the feedback codebook according to one or more parameters of a maximum feedback window size M, a minimum feedback delay k, a TTI length that can be transmitted on a carrier, the number of TTI lengths that can be transmitted, and a TTI length that carries feedback information, which correspond to each TTI length.

Further, the minimum feedback delay k is a predefined value.

In a specific embodiment, the determining apparatus is applied to a terminal, and as shown in fig. 5, the apparatus further includes:

a feedback module 22, configured to generate feedback information according to the determined size of the feedback codebook, and send the feedback information to the base station at a corresponding feedback position;

in another specific embodiment, the determining apparatus is applied to a base station, and as shown in fig. 6, the apparatus further includes:

and the receiving module 23 is configured to receive the feedback information sent by the terminal at the corresponding feedback position according to the determined size of the feedback codebook.

An embodiment of the present invention further provides a method for determining a feedback codebook, as shown in fig. 7, including:

step 301: the communication terminal determines the size of a feedback codebook according to predefined information or configuration information, wherein the configuration information indicates the size of a feedback window on one or more carriers, and the feedback window transmits data with one or more TTI lengths.

In the embodiment, the size of the feedback window is directly determined according to the predefined or configuration information, so that the base station and the communication terminal can determine the size of the ACK/NACK codebook when the feedback position is flexibly notified by the base station, and the error of the size of the ACK/NACK codebook between the base station and the terminal is avoided.

The configuration information is configured semi-statically by a high-level signaling, and for the same feedback resource, the base station does not schedule the TTI number which exceeds the TTI number which is indicated by the configuration information and needs to be fed back.

The configuration information indicates a feedback window size on one or more carriers; data of one or more TTI lengths may be transmitted in the feedback window.

Further, the downlink scheduling signaling corresponding to the TTI transmitted in the feedback window carries a downlink assignment index DAI. The DAI is a TTI number scheduled in a feedback window, and the used bit number is determined according to the size of the actual feedback window; alternatively, the DAI may be a 2-bit time-domain counter, which is used cyclically.

In a specific embodiment, the communication terminal is a terminal, the configuration information is sent by the base station to the terminal, and after determining the size of the feedback codebook, as shown in fig. 8, the method further includes:

step 302: and generating feedback information according to the size of the determined feedback codebook, and sending the feedback information to the base station at the corresponding feedback position.

In another specific embodiment, the communication terminal is a base station, and as shown in fig. 9, after determining the size of the feedback codebook, the method further includes:

step 303: and receiving feedback information sent by the terminal at the corresponding feedback position according to the determined size of the feedback codebook.

An embodiment of the present invention further provides a device for determining a feedback codebook, as shown in fig. 10, including:

a processing module 41, configured to determine the size of a feedback codebook according to predefined information or according to configuration information issued by a base station, where the configuration information indicates the size of a feedback window on one or more carriers, and the feedback window transmits data with one or more TTI lengths.

In a specific embodiment, the determining apparatus is applied to a terminal, and the configuration information is issued by a base station to the terminal, as shown in fig. 11, the apparatus further includes:

and a feedback module 42, configured to generate feedback information according to the determined size of the feedback codebook, and send the feedback information to the base station at a corresponding feedback position.

In another specific embodiment, the determining apparatus is applied to a base station, and as shown in fig. 12, the apparatus further includes:

a receiving module 43, configured to receive the feedback information sent by the terminal at the corresponding feedback position according to the determined size of the feedback codebook.

The following describes the method for determining a feedback codebook according to the present invention in detail with reference to the accompanying drawings and specific embodiments:

example 1:

as shown in fig. 13, for single carrier transmission and TTI transmission with only one length exists on a carrier, the size of the actual feedback codebook on the carrier is determined directly according to the maximum feedback window size M and the transmission mode of the carrier. Specifically, for TTI n +7 on the carrier, the maximum feedback window size M is 4, which may be predefined, or is notified to the terminal by the base station, or is predefined to indicate the feedback delay M through 2-bit information, and then the feedback window size is 4 according to the 2-bit information. If the terminal receives downlink data transmission of any one or more TTIs in the feedback window, feedback is carried out according to the size of the feedback window being 4, if a single-codeword transmission mode is used, the size of a feedback codebook is 4, and if a double-codeword transmission mode is used, the size of the feedback codebook is 8.

Example 2:

as shown in fig. 14, in single carrier transmission, a TTI of 14 symbol lengths and a TTI of 7 symbol lengths coexist on a carrier, assuming that the maximum feedback window size M of the TTI of 14 symbol lengths and the TTI of 7 symbol lengths are both 4, the minimum feedback delay k is also both 4, and the TTI of 7 symbol lengths is used to transmit feedback information. As shown in fig. 14, if the feedback windows of the two TTIs are not overlapped, the feedback window sizes M corresponding to the two TTIs are directly added, and the actual feedback window size is 8. If the terminal receives downlink data transmission of any one or more TTIs in the feedback window, feedback is carried out according to the size of the feedback window being 8, if a single-codeword transmission mode is used, the size of the feedback codebook is 8, and if a double-codeword transmission mode is used, the size of the feedback codebook is 16.

Example 3:

as shown in fig. 15, for single carrier transmission, a TTI of 14 symbols and a TTI of 7 symbols coexist on a carrier, assuming that the maximum feedback window size M of the TTI of 14 symbols and the TTI of 7 symbols is 4, and the TTI of 7 symbols is used to transmit feedback information, but the minimum feedback delay k corresponding to the TTI of 14 symbols is 4, and the minimum feedback delay k corresponding to the TTI of 7 symbols is 6. As shown in fig. 15, for the uplink feedback resource in the second slot (timeslot) in the subframe n +7, the bearable downlink transmission includes 14-symbol-length TTIs transmitted in the downlink subframes n, n +1, n +2, and n +3 and 7-symbol-length TTIs transmitted in the downlink subframes n +3 and n +4, where the subframe n +3 is an overlapping portion of feedback windows corresponding to TTIs of two lengths, and then the size of the feedback codebook can be obtained in the following two ways:

the first method is as follows: the feedback window sizes M corresponding to the two TTI lengths are directly added, and the actual feedback window size is 8. If the terminal receives downlink data transmission of any one or more TTIs in the feedback window, feedback is carried out according to the size of the feedback window being 8, if a single-codeword transmission mode is used, the size of the feedback codebook is 8, and if a double-codeword transmission mode is used, the size of the feedback codebook is 16.

The second method comprises the following steps: since the subframe n +3 can be predetermined to be the overlapping part of the feedback window corresponding to the TTIs of two lengths, the size of the feedback codebook is determined according to the shortest transmittable TTI length in the subframe n +3, that is, the feedback codebook corresponding to the subframe n +3 is determined according to the TTI of 7 symbol lengths, the size of the feedback codebook is determined according to the TTI of 14 symbol lengths in the subframes n, n +1 and n +2, and the size of the feedback codebook is determined according to the TTI of 7 symbol lengths in the subframe n + 4. Therefore, the actual feedback window size corresponding to the second slot feedback resource in subframe n +8 is 7. If the terminal receives downlink data transmission of any one or more TTIs in the feedback window, feedback is carried out according to the size of the feedback window being 7, if a single-codeword transmission mode is used, the size of a feedback codebook is 7, and if a double-codeword transmission mode is used, the size of the feedback codebook is 14.

Example 4:

as shown in fig. 16, for single carrier transmission, a TTI of 14 symbol lengths and a TTI of 2 symbol lengths coexist on a carrier, and feedback information is transmitted using a TTI of 14 symbol lengths, assuming that a maximum feedback window size M of the TTI of 14 symbol lengths is 4, a maximum feedback window size M of the TTI of 7 symbol lengths is 16, a minimum feedback delay k corresponding to the TTI of 14 symbol lengths is 4, and a minimum feedback delay k corresponding to the TTI of 2 symbol lengths is 6. As shown in fig. 16, for the uplink feedback resource in the subframe n +7, the bearable downlink transmission is a TTI of 14 symbol lengths transmitted in the downlink subframes n, n +1, n +2, and n +3, and a TTI of 2 symbol lengths transmitted in the downlink subframes n +4 and n +5 and the first 4 symbols of the subframe n + 6. If the feedback windows of the two TTIs are not overlapped, the sizes M of the feedback windows corresponding to the two TTIs are directly added, and the actual size of the feedback window is 20. If the terminal receives downlink data transmission of any one or more TTIs in the feedback window, feedback is carried out according to the size of the feedback window being 20, if a single-codeword transmission mode is used, the size of the feedback codebook is 20, and if a double-codeword transmission mode is used, the size of the feedback codebook is 40.

Example 5:

as shown in fig. 17, for single carrier transmission and simultaneous existence of TTI of 14 symbol length and TTI of 7 symbol length on a carrier, it is assumed that a base station notifies a terminal through high layer signaling that a feedback window size M is 10, a predefined minimum feedback delay k is 4, and TTI of 7 symbol length is used to transmit feedback information. As shown in fig. 17, the base station indicates DAI information through downlink scheduling signaling in each scheduled TTI, and assuming that the base station schedules 6 TTIs in total in a feedback window, the DAI information is 1 to 6 respectively, where the DAI may be indicated through 4-bit information or cyclically indicated through 2-bit information, for example, the DAI is 1, 5, or 9 is indicated through bit 00, the DAI is 2, 6, or 10 is indicated through bit 01, the DAI is 3 or 7 is indicated through bit 10, and the DAI is 0, 4, or 8 is indicated through bit 11. If the terminal receives downlink data transmission of any one or more TTIs in the feedback window, feedback is carried out according to the size of the feedback window being 10, if a single-codeword transmission mode is used, the size of the feedback codebook is 10, and if a double-codeword transmission mode is used, the size of the feedback codebook is 20. When the terminal generates the feedback information, the feedback positions (determined as 6 bits or 12 bits according to the carrier transmission mode) corresponding to the previous 6 TTIs are fed back according to the actually received information, and the rest feedback positions supplement NACK/DTX.

It should be noted that, in the foregoing embodiment, only a single carrier is taken as an example, if the transmission is multi-carrier transmission, a manner of calculating a feedback codebook in the single carrier may be used on each carrier, and finally, the feedback codebooks of the multi-carriers are concatenated as a feedback codebook to be sent to the base station, which is not described herein again.

In the above scheme, the size of the feedback codebook is determined according to one or more of the information such as the maximum feedback window size M, the minimum feedback delay k, the number of TTIs that can be transmitted and the number of TTIs that can be transmitted on a carrier, and the TTI length that carries feedback information, or the size of the feedback window is directly determined according to predefined or configuration information, so that the base station and the terminal can determine the size of the ACK/NACK codebook when the feedback position is flexibly notified by the base station, and the misinterpretation of the size of the ACK/NACK codebook between the base station and the terminal is avoided.

Many of the functional units described in this specification have been labeled as modules, in order to more particularly emphasize their implementation independence.

In embodiments of the present invention, modules may be implemented in software for execution by various types of processors. An identified module of executable code may, for instance, comprise one or more physical or logical blocks of computer instructions which may, for instance, be constructed as an object, procedure, or function. Nevertheless, the executables of an identified module need not be physically located together, but may comprise disparate instructions stored in different physical locations which, when joined logically together, comprise the module and achieve the stated purpose for the module.

Indeed, a module of executable code may be a single instruction, or many instructions, and may even be distributed over several different code segments, among different programs, and across several memory devices. Likewise, operational data may be identified within the modules and may be embodied in any suitable form and organized within any suitable type of data structure. The operational data may be collected as a single data set, or may be distributed over different locations including over different storage devices, and may exist, at least partially, merely as electronic signals on a system or network.

When a module can be implemented by software, considering the level of existing hardware technology, a module implemented by software may build a corresponding hardware circuit to implement a corresponding function, without considering cost, and the hardware circuit may include a conventional Very Large Scale Integration (VLSI) circuit or a gate array and an existing semiconductor such as a logic chip, a transistor, or other discrete components. A module may also be implemented in programmable hardware devices such as field programmable gate arrays, programmable array logic, programmable logic devices or the like.

In the embodiments of the methods of the present invention, the sequence numbers of the steps are not used to limit the sequence of the steps, and for those skilled in the art, the sequence of the steps is not changed without creative efforts.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for determining a feedback codebook, comprising:

the communication terminal determines the size of a feedback codebook according to one or more parameters of the maximum feedback window size M, the minimum feedback time delay k, the TTI length which can be transmitted on a carrier wave, the number of the TTI lengths which can be transmitted and the TTI length which bears feedback information corresponding to each TTI length;

the communication terminal determines the size of the feedback codebook according to one or more parameters of the maximum feedback window size M, the minimum feedback delay k, the TTI length capable of being transmitted on the carrier wave, the number of the TTI lengths capable of being transmitted and the TTI length for bearing the feedback information, which correspond to each TTI length, and comprises the following steps:

2. The method of claim 1, wherein the maximum feedback window size M is a predefined value or a value determined by signaling interaction with other communication terminals; or

3. The method of determining a feedback codebook according to claim 1, wherein the minimum feedback delay k is a predefined value.

4. The method of claim 1, wherein in the tdd system, the feedback information bits corresponding to the TTI determined as the uplink transmission in the feedback window are subtracted to obtain the size of the feedback codebook.

5. The method of determining a feedback codebook according to any one of claims 1 to 4,

the communication terminal is a terminal, and after the size of the feedback codebook is determined, the method further comprises the following steps:

6. The method of claim 5, wherein the generating feedback information according to the determined size of the feedback codebook and sending the feedback information to the base station at the corresponding feedback position comprises:

7. The method of claim 5, wherein the generating feedback information according to the determined size of the feedback codebook and sending the feedback information to the base station at the corresponding feedback position comprises:

8. The method of determining a feedback codebook according to claim 7,

in multi-carrier transmission, feedback information is generated separately for each carrier by the method of claim 7, and the generated feedback information is concatenated as a feedback codebook to be sent to the base station.

9. An apparatus for determining a feedback codebook, comprising:

the processing module is used for determining the size of the feedback codebook according to one or more parameters of the maximum feedback window size M, the minimum feedback time delay k, the TTI length which can be transmitted on the carrier wave, the number of the TTI lengths which can be transmitted and the TTI length which bears the feedback information corresponding to each TTI length;

the processing module is specifically configured to determine the size of a feedback codebook on a carrier according to a maximum feedback window size M and a transmission mode of the carrier when only a TTI of one length exists on the carrier; or

10. The apparatus for determining a feedback codebook according to claim 9, wherein the maximum feedback window size M is a predefined value or a value determined by signaling interaction with other communication terminals; or

11. The apparatus for determining a feedback codebook according to claim 9, wherein the minimum feedback delay k is a predefined value.

12. The apparatus of claim 9, wherein in the tdd system, the processing module is configured to subtract a feedback information bit corresponding to a TTI determined as uplink transmission in a feedback window to obtain a size of the feedback codebook.

13. The apparatus for determining feedback codebook according to any of claims 9-12, wherein the apparatus is applied to a terminal, the apparatus further comprising:

14. The apparatus for determining a feedback codebook according to claim 13,

the feedback module is specifically configured to determine a feedback position corresponding to each sTTI according to k × sTTI + m × sTTI, where k is a minimum feedback delay corresponding to the sTTI, m is an indication feedback delay corresponding to the sTTI, and the sTTI is an actual length of a downlink data TTI that needs to be fed back or a minimum TTI length that can be transmitted on a carrier.

15. The apparatus for determining a feedback codebook according to claim 13,

the feedback module is specifically used for sequencing the feedback codebook according to the front-back sequence of the TTIs in the feedback window when the single carrier is transmitted and only one TTI (transmission time interval) with one length exists on the carrier, and supplementing NACK/DTX (negative acknowledgement/negative acknowledgement) to the TTIs without received information at corresponding positions to obtain feedback information;

16. The apparatus for determining a feedback codebook according to claim 15,

and during multi-carrier transmission, the feedback module is used for respectively generating feedback information for each carrier, and cascading the generated feedback information to be used as a feedback codebook sent to the base station.

17. A method for determining a feedback codebook, comprising:

the communication terminal determines the size of a feedback codebook according to configuration information, wherein the configuration information indicates the size of a feedback window on one or more carriers, and the feedback window transmits data with one or more TTI lengths.

18. The method of claim 17, wherein a downlink scheduling signaling corresponding to the TTI transmitted in the feedback window carries a downlink assignment index DAI.

19. The method of claim 17 or 18, wherein the communication terminal is a terminal, the configuration information is sent from a base station to the terminal, and after determining the size of the feedback codebook, the method further comprises:

20. The method of claim 19, wherein the generating feedback information according to the determined size of the feedback codebook and sending the feedback information to the base station at the corresponding feedback position comprises:

21. The method of claim 19, wherein the generating feedback information according to the determined size of the feedback codebook and sending the feedback information to the base station at the corresponding feedback position comprises:

22. The method of determining a feedback codebook according to claim 21,

in multi-carrier transmission, feedback information is generated separately for each carrier by the method of claim 21, and the generated feedback information is concatenated as a feedback codebook to be sent to the base station.

23. An apparatus for determining a feedback codebook, comprising:

a processing module, configured to determine a size of a feedback codebook according to configuration information, where the configuration information indicates a size of a feedback window on one or more carriers, and the feedback window transmits data of one or more TTI lengths.

24. The apparatus for determining the feedback codebook of claim 23, wherein a downlink scheduling signaling corresponding to the TTI transmitted in the feedback window carries a downlink assignment index DAI.

25. The apparatus for determining a feedback codebook according to claim 23 or 24,

the determining device is applied to a terminal, the configuration information is issued to the terminal by a base station, and the device further comprises:

26. The apparatus for determining a feedback codebook according to claim 25,

27. The apparatus for determining a feedback codebook according to claim 25,

the feedback module is specifically configured to, during single carrier transmission, sort the feedback codebook according to the DAI indicated in the downlink scheduling signaling to generate feedback information, and supplement NACK/DTX at the end of the feedback information until the determined size of the feedback codebook is satisfied.

28. The apparatus for determining a feedback codebook according to claim 27,