# US 2019/0165899 A1 · Transmission method and apparatus for feedback information of uplink transmission

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- Number: US 2019/0165899 A1
- Document ID: US20190165899A1
- Status: Published application
- Kind: A1
- Application number: 16/313,125
- Filed: 2017-03-09
- Published: 2019-05-30
- Earliest claimed: 2016-06-22
- Assignees: China Academy of Telecommunications Technology
- Applicants: China Academy of Telecommunications Technology
- Inventors: Xuejuan GAO; Xueming PAN
- Web page: https://patentgrep.com/patent/US20190165899A1

## CPC

- H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)}
- H04L 1/1864: {ARQ related signaling (H04L1/1607 takes precedence)}
- H04L 1/1816: {with retransmission of the same, encoded, message}
- H04L 1/1887: {Scheduling and prioritising arrangements}
- H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH}
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04L 5/14: Two-way operation using the same type of signal, i.e. duplex
- H04L 5/1469: {using time-sharing}
- H04L 27/0014: {Carrier regulation (of chaotic carriers H04L27/001; for multicarrier receivers H04L27/2657)}
- H04W 76/11: Allocation or use of connection identifiers
- H04W 92/10: between terminal device and access point, i.e. wireless air interface
- H04L 1/0045: {Arrangements at the receiver end}
- H04L 2027/0095: {in a preamble or similar structure}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

The present invention discloses a transmission method and apparatus for feedback information of uplink transmission. The method comprises: a terminal transmitting a physical uplink shared channel (PUSCH) in a special sub-frame m, where m is an integer; the terminal detecting, subsequent to the special frame m, in a sub-frame comprising downlink transmission resources or in a sub-frame m+k, a downlink control channel using an uplink/downlink control information (DCI) format, where k is a positive integer, and the terminal determining, according to the downlink control channel, whether to again transmit the PUSCH transmitted in the special sub-frame m. accordingly, the present invention provides a transmission solution that transmits PUSCH feedback information in a special sub-frame, ensuring that the PUSCH transmitted in the special sub-frame can normally obtain ACK/NACK feedback information.

## Claims

### Claim 1

A method for receiving feedback information of uplink transmission, the method comprising:
transmitting, by a terminal, a Physical Uplink Shared Channel (PUSCH) in a special subframe m, wherein m is an integer;
detecting, by the terminal, a downlink control channel with an uplink Downlink Control Information (DCI) format, in a subframe comprising a downlink transmission resource subsequent to the special subframe m, or in a subframe m+k, wherein k is a positive integer; and
deciding, by the terminal, whether to retransmit the PUSCH transmitted in the special subframe m, according to the downlink control channel.

### Claim 2 (depends on 1)

The method according to claim 1, wherein k is defined as follows:
for the Time Division Duplex (TDD) uplink-downlink configuration 0, if m is 1 or 6, then k will be 4, 5, 9, or 10; or
for the TDD uplink-downlink configuration 1, if m is 1 or 6, then k will be 3, 5, 8, or 10; or
for the TDD uplink-downlink configuration 2, if m is 1 or 6, then k will be 2 or 7; or
for the TDD uplink-downlink configuration 3, if m is 1, then k will be 7, 8, or 9; or
for the TDD uplink-downlink configuration 4, if m is 1, then k will be 7 or 8; or
for the TDD uplink-downlink configuration 5, if m is 1, then k will be 7; or
for the TDD uplink-downlink configuration 6, if m is 1, then k will be 4, 5, 8, 9, or 10; or
for the TDD uplink-downlink configuration 6, if m is 6, then k will be 3, 4, 5, 9, or 10; or
the subframe m+k is different from a subframe detected for a downlink control channel corresponding to a PUSCH transmitted in a normal subframe.

### Claim 3 (depends on 1)

The method according to claim 1, wherein deciding, by the terminal, whether to retransmit the PUSCH transmitted in the special subframe m, according to the downlink control channel comprises:
determining, by the terminal, whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe, according to the downlink control channel; and
after it is determined that the downlink control channel corresponds to a PUSCH transmitted in a special subframe, deciding, by the terminal, whether to retransmit the PUSCH transmitted in the special subframe m, according to an indicating field for indicating whether to retransmit the PUSCH, the indicating field is carried in the downlink control channel.

### Claim 4 (depends on 3)

The method according to claim 3, wherein determining, by the terminal, whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe, according to the downlink control channel comprises:
determining, by the terminal, whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe, according to a size of the uplink DCI format for the downlink control channel; and/or
determining, by the terminal, whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe, according to a first indicating field in the downlink control channel, wherein the first indicating field indicates information about a PUSCH corresponding to the downlink control channel; and/or
determining, by the terminal, whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe, according to a second indicating field in the downlink control channel, wherein the second indicating field indicates whether a PUSCH corresponding to the downlink control channel is a PUSCH transmitted in a special subframe, or a PUSCH in a normal subframe; and/or
determining, by the terminal, whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe, according to a Radio Network Temporary Identifier (RNTI) for scrambling the downlink control channel; and/or
determining, by the terminal, whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe, according to a 2-bit uplink (UL) index indicating field in the downlink control channel.

### Claim 5 (depends on 4)

The method according to claim 4, wherein determining, by the terminal, whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe, according to the size of the uplink DCI format for the downlink control channel comprises:
if the terminal detects that the uplink DCI format for the downlink control channel has a first DCI size, then determining, by the terminal, that the downlink control channel corresponds to a PUSCH transmitted in a special subframe; or
if the terminal detects that the uplink DCI format for the downlink control channel has a second DCI size, then determining, by the terminal, that the downlink control channel corresponds to a PUSCH transmitted in a normal subframe;
wherein the first DCI size is different from the second DCI size;
wherein the determining, by the terminal, whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe, according to a first indicating field in the downlink control channel comprises: the first indicating field carries a Hybrid-Automatic Repeat Request (HARQ) process number of the PUSCH corresponding to the downlink control channel;
wherein the determining, by the terminal, whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe, according to the RNTI for scrambling the downlink control channel comprises:
if the terminal detects that the downlink control channel is scrambled using a first RNTI, then determining, by the terminal, that the downlink control channel corresponds to a PUSCH transmitted in a special subframe; or
if the terminal detects that the downlink control channel is scrambled using a second RNTI, then determining, by the terminal, that the downlink control channel corresponds to a PUSCH transmitted in a normal subframe;
wherein the first RNTI is different from the second RNTI;
wherein determining, by the terminal, whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe, according to the 2-bit uplink (UL) index indicating field in the downlink control channel comprises:
when both a Least Significant Bit (LSB) and a Most Significant Bit (MSB) in the UL index are set to 0, determining, by the terminal, that the downlink control channel corresponds to a PUSCH transmitted in a special subframe;
when at least one of the LSB and the MSB in the UL index is set to 1, determining, by the terminal, that the downlink control channel corresponds to a PUSCH transmitted in a normal uplink subframe.

### Claim at position 6

-7. (canceled)

### Claim 8 (depends on 5)

The method according to claim 5, wherein if the first RNTI is shared by a plurality of terminals, then after the terminal determines that the downlink control channel corresponds to a PUSCH transmitted in a special subframe, the method further comprises:
determining, by the terminal, a position, of an indicating field for indicating whether to retransmit the PUSCH, corresponding to the terminal, in the downlink control channel according to an index of the terminal.

### Claim 9

(canceled)

### Claim 10 (depends on 2)

The method according to claim 2, wherein when the subframe m+k is different from a subframe detected for a downlink control channel corresponding to a PUSCH transmitted in a normal subframe, k is defined as follows:
for the TDD uplink-downlink configuration 1, if m is 1 or 6, then k will be 4 or 9; or
for the TDD uplink-downlink configuration 2, if m is 1 or 6, then k will be 3, 4, 5, 8, 9, or 10; or
for the TDD uplink-downlink configuration 3, if m is 1, then k will be 4, 5, 6, or 10; or
for the TDD uplink-downlink configuration 4, if m is 1, then k will be 3, 4, 5, 6, 9, or 10; or
for the TDD uplink-downlink configuration 5, if m is 1, then k will be 2, 3, 4, 5, 6, 8, 9, or 10; and/or
the deciding, by the terminal, whether to retransmit the PUSCH transmitted in the special subframe m, according to the downlink control channel comprises:
deciding, by the terminal, whether to retransmit the PUSCH transmitted in the special subframe m, according to an indicating field for indicating whether to retransmit the PUSCH, the indicating field is carried in the downlink control channel.

### Claim at position 10

-12. (canceled)

### Claim 13

A method for transmitting feedback information of uplink transmission, the method comprising:
scheduling, by a base station, a terminal to transmit a Physical Uplink Shared Channel (PUSCH) in a special subframe m, wherein m is an integer;
detecting, by the base station, a PUSCH transmitted by the terminal in the special subframe m; and
transmitting, by the base station, a downlink control channel with an uplink Downlink Control Information (DCI) format to the terminal in a subframe comprising a downlink transmission resource subsequent to the special subframe m, or in a subframe m+k, wherein k is a positive integer, and the downlink control channel carries an indicating field for indicating whether to retransmit the PUSCH transmitted in the special subframe m.

### Claim 14 (depends on 13)

The method according to claim 13, wherein k is defined as follows:
for the Time Division Duplex (TDD) uplink-downlink configuration 0, if m is 1 or 6, then k will be 4, 5, 9, or 10; or
for the TDD uplink-downlink configuration 1, if m is 1 or 6, then k will be 3, 5, 8, or 10; or
for the TDD uplink-downlink configuration 2, if m is 1 or 6, then k will be 2 or 7; or
for the TDD uplink-downlink configuration 3, if m is 1, then k will be 7, 8, or 9; or
for the TDD uplink-downlink configuration 4, if m is 1, then k will be 7 or 8; or
for the TDD uplink-downlink configuration 5, if m is 1, then k will be 7; or
for the TDD uplink-downlink configuration 6, if m is 1, then k will be 4, 5, 8, 9, or 10; or
for the TDD uplink-downlink configuration 6, if m is 6, then k will be 3, 4, 5, 9, or 10; or
wherein the subframe m+k is different from a subframe detected for a downlink control channel corresponding to a PUSCH transmitted in a normal subframe.

### Claim 15 (depends on 13)

The method according to claim 13, wherein transmitting, by the base station, the downlink control channel with the uplink DCI format to the terminal comprises:
determining, by the base station, a size of the uplink DCI format for the downlink control channel according to whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe; and/or
carrying, by the base station, a first indicating field in the downlink control channel, wherein the first indicating field indicates information about a PUSCH corresponding to the downlink control channel; and/or
carrying, by the base station, a second indicating field in the downlink control channel, wherein the second indicating field indicates whether a PUSCH corresponding to the downlink control channel is a PUSCH transmitted in a special subframe, or a PUSCH in a normal subframe; and/or
determining, by the base station, a Radio Network Temporary Identifier (RNTI) for scrambling the downlink control channel, according to whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe; and/or
determining, by the base station, a value of a 2-bit uplink (UL) index indicating field in the downlink control channel according to whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe.

### Claim 16 (depends on 15)

The method according to claim 15, wherein determining, by the base station, the size of the uplink DCI format for the downlink control channel according to whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe comprises:
if the downlink control channel corresponds to a PUSCH transmitted in a special subframe, then determining, by the base station, that the uplink DCI format for the downlink control channel has a first DCI size; or
if the downlink control channel corresponds to a PUSCH transmitted in a normal subframe, then determining, by the base station, that the uplink DCI format for the downlink control channel has a second DCI size;
wherein the first DCI size is different from the second DCI size;
wherein carrying, by the base station, a first indicating field in the downlink control channel, comprises: the first indicating field carries an HARQ process number of the PUSCH corresponding to the downlink control channel;
wherein determining by the base station, the RNTI for scrambling the downlink control channel, according to whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe comprises:
if the downlink control channel corresponds to a PUSCH transmitted in a special subframe, then determining, by the base station, that the downlink control channel is scrambled using a first RNTI; or
if the downlink control channel corresponds to a PUSCH transmitted in a normal subframe, then determining, by the base station, that the downlink control channel is scrambled using a second RNTI;
wherein the first RNTI is different from the second RNTI;
the determining, by the base station, the value of the 2-bit uplink (UL) index indicating field in the downlink control channel according to whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe comprises:
if the downlink control channel corresponds to a PUSCH transmitted in a special subframe, then setting, by the base station, both a Least Significant Bit (LSB) and a Most Significant Bit (MSB) in the UL index to 0; and
if the downlink control channel corresponds to a PUSCH transmitted in a normal subframe, then setting, by the base station, at least one of the LSB and the MSB in the UL index to 1.

### Claim at position 15

-18. (canceled)

### Claim 19 (depends on 16)

The method according to claim 16, wherein if the RNTI corresponding to the special subframe is shared by a plurality of terminals, then the method further comprises:
mapping, by the base station, the indicating fields for indicating whether to retransmit PUSCHs, of the plurality of terminals to corresponding positions in the downlink control channel corresponding to a special subframe according to indexes of the plurality of terminals.

### Claim 20

(canceled)

### Claim 21 (depends on 14)

The method according to claim 14, wherein when the subframe m+k is different from a subframe detected for a downlink control channel corresponding to a PUSCH transmitted in a normal subframe, k is defined as follows:
for the TDD uplink-downlink configuration 1, if m is 1 or 6, then k will be 4 or 9; or
for the TDD uplink-downlink configuration 2, if m is 1 or 6, then k will be 3, 4, 5, 8, 9, or 10; or
for the TDD uplink-downlink configuration 3, if m is 1, then k will be 4, 5, 6, or 10; or
for the TDD uplink-downlink configuration 4, if m is 1, then k will be 3, 4, 5, 6, 9, or 10; or
for the TDD uplink-downlink configuration 5, if m is 1, then k will be 2, 3, 4, 5, 6, 8, 9, or 10.

### Claim at position 19

-44. (canceled)

### Claim 45

A terminal, comprising a transceiver, and at least one processor connected with the transceiver, wherein:
the processor is configured to read and execute program in a memory:
to control the transceiver to transmit a PUSCH in a special subframe m, wherein m is an integer; to detect a downlink control channel with an uplink DCI format in a subframe comprising a downlink transmission resource subsequent to the special subframe m, or in a subframe m+k, wherein k is a positive integer; and to decide whether to retransmit the PUSCH transmitted in the special subframe m, according to the downlink control channel; and
the transceiver is configured to receive and transmit data under the control of the processor.

### Claim 46

A base station, comprising a transceiver, and at least one processor connected with the transceiver, wherein:
the processor is configured to read and execute program in a memory:
to schedule a terminal through the transceiver to transmit a Physical Uplink Shared Channel (PUSCH) in a special subframe m, wherein m is an integer; to detect a PUSCH transmitted by the terminal in the special subframe m; and to control the transceiver to transmit a downlink control channel with an uplink DCI format to the terminal in a subframe comprising a downlink transmission resource subsequent to the special subframe m, or in a subframe m+k, wherein k is a positive integer, and the downlink control channel carries an indicating field for indicating whether to retransmit the PUSCH transmitted in the special subframe m; and
the transceiver is configured to receive and transmit data under the control of the processor.

### Claim 47 (depends on 45)

The terminal according to claim 45, wherein k is defined as follows:
for the Time Division Duplex (TDD) uplink-downlink configuration 0, if m is 1 or 6, then k will be 4, 5, 9, or 10; or
for the TDD uplink-downlink configuration 1, if m is 1 or 6, then k will be 3, 5, 8, or 10; or
for the TDD uplink-downlink configuration 2, if m is 1 or 6, then k will be 2 or 7; or
for the TDD uplink-downlink configuration 3, if m is 1, then k will be 7, 8, or 9; or
for the TDD uplink-downlink configuration 4, if m is 1, then k will be 7 or 8; or
for the TDD uplink-downlink configuration 5, if m is 1, then k will be 7; or
for the TDD uplink-downlink configuration 6, if m is 1, then k will be 4, 5, 8, 9, or 10; or
for the TDD uplink-downlink configuration 6, if m is 6, then k will be 3, 4, 5, 9, or 10; or
the subframe m+k is different from a subframe detected for a downlink control channel corresponding to a PUSCH transmitted in a normal subframe.

### Claim 48 (depends on 45)

The terminal according to claim 45, wherein the processor is configured to read and execute program in a memory:
to determine whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe, according to the downlink control channel; and
after it is determined that the downlink control channel corresponds to a PUSCH transmitted in a special subframe, to decide whether to retransmit the PUSCH transmitted in the special subframe m, according to an indicating field for indicating whether to retransmit the PUSCH, the indicating field is carried in the downlink control channel.

### Claim 49 (depends on 48)

The terminal according to claim 48, wherein the processor is configured to read and execute program in a memory:
to determine whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe, according to a size of the uplink DCI format for the downlink control channel; and/or
to determine whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe, according to a first indicating field in the downlink control channel, wherein the first indicating field indicates information about a PUSCH corresponding to the downlink control channel; and/or
to determine whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe, according to a second indicating field in the downlink control channel, wherein the second indicating field indicates whether a PUSCH corresponding to the downlink control channel is a PUSCH transmitted in a special subframe, or a PUSCH in a normal subframe; and/or
to determine whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe, according to a Radio Network Temporary Identifier (RNTI) for scrambling the downlink control channel; and/or
to determine whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe, according to a 2-bit uplink (UL) index indicating field in the downlink control channel.

### Claim 50 (depends on 49)

The terminal according to claim 49, wherein the processor is configured to read and execute program in a memory:
if the detecting module detects that the uplink DCI format for the downlink control channel has a first DCI size, to determine that the downlink control channel corresponds to a PUSCH transmitted in a special subframe; or if the detecting module detects that the uplink DCI format for the downlink control channel has a second DCI size, to determine that the downlink control channel corresponds to a PUSCH transmitted in a normal subframe; wherein the first DCI size is different from the second DCI size;
wherein the processor is configured to read and execute program in a memory to determine whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe, according to a first indicating field in the downlink control channel wherein the first indicating field carries a Hybrid-Automatic Repeat Request (HARQ) process number of the PUSCH corresponding to the downlink control channel;
wherein the processor is configured to read and execute program in a memory:
if the detecting module detects that the downlink control channel is scrambled using a first RNTI, to determine that the downlink control channel corresponds to a PUSCH transmitted in a special subframe; or
if the detecting module detects that the downlink control channel is scrambled using a second RNTI, to determine that the downlink control channel corresponds to a PUSCH transmitted in a normal subframe; where the first RNTI is different from the second RNTI;
wherein the processor is configured to read and execute program in a memory:
when both a Least Significant Bit (LSB) and a Most Significant Bit (MSB) in the UL index are set to 0, to determine that the downlink control channel corresponds to a PUSCH transmitted in a special subframe; and
when at least one of the LSB or the MSB in the UL index is set to 1, to determine that the downlink control channel corresponds to a PUSCH transmitted in a normal uplink subframe.

### Claim 51 (depends on 50)

The terminal according to claim 50, wherein if the first RNTI is shared by a plurality of terminals, then the processor is configured to read and execute program in a memory:
to determine a position, of an indicating field for indicating whether to retransmit the PUSCH, corresponding to the terminal, in the downlink control channel according to an index of the terminal.

### Claim 52 (depends on 47)

The terminal according to claim 47, wherein when the subframe m+k is different from a subframe detected for a downlink control channel corresponding to a PUSCH transmitted in a normal subframe, k is defined as follows:
for the TDD uplink-downlink configuration 1, if m is 1 or 6, then k will be 4 or 9; or
for the TDD uplink-downlink configuration 2, if m is 1 or 6, then k will be 3, 4, 5, 8, 9, or 10; or
for the TDD uplink-downlink configuration 3, if m is 1, then k will be 4, 5, 6, or 10; or
for the TDD uplink-downlink configuration 4, if m is 1, then k will be 3, 4, 5, 6, 9, or 10; or
for the TDD uplink-downlink configuration 5, if m is 1, then k will be 2, 3, 4, 5, 6, 8, 9, or 10; and/or
wherein the processor is configured to read and execute program in a memory:
to decide whether to retransmit the PUSCH transmitted in the special subframe m, according to an indicating field for indicating whether to retransmit the PUSCH, the indicating field is carried in the downlink control channel.

### Claim 53 (depends on 46)

The base station according to claim 46, wherein k is defined as follows:
for the Time Division Duplex (TDD) uplink-downlink configuration 0, if m is 1 or 6, then k will be 4, 5, 9, or 10; or
for the TDD uplink-downlink configuration 1, if m is 1 or 6, then k will be 3, 5, 8, or 10; or
for the TDD uplink-downlink configuration 2, if m is 1 or 6, then k will be 2 or 7; or
for the TDD uplink-downlink configuration 3, if m is 1, then k will be 7, 8, or 9; or
for the TDD uplink-downlink configuration 4, if m is 1, then k will be 7 or 8; or
for the TDD uplink-downlink configuration 5, if m is 1, then k will be 7; or
for the TDD uplink-downlink configuration 6, if m is 1, then k will be 4, 5, 8, 9, or 10; or
for the TDD uplink-downlink configuration 6, if m is 6, then k will be 3, 4, 5, 9, or 10; or
wherein the subframe m+k is different from a subframe detected for a downlink control channel corresponding to a PUSCH transmitted in a normal subframe.

### Claim 54 (depends on 46)

The base station according to claim 46, wherein the processor is configured to read and execute program in a memory:
to determine a size of the uplink DCI format for the downlink control channel according to whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe; and/or
to carry a first indicating field in the downlink control channel, wherein the first indicating field indicates information about a PUSCH corresponding to the downlink control channel; and/or
to carry a second indicating field in the downlink control channel, wherein the second indicating field indicates whether a PUSCH corresponding to the downlink control channel is a PUSCH transmitted in a special subframe, or a PUSCH in a normal subframe; and/or
to determine a Radio Network Temporary Identifier (RNTI) for scrambling the downlink control channel, according to whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe; and/or
to determine the value of a 2-bit uplink (UL) index indicating field in the downlink control channel according to whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe.

### Claim 55 (depends on 54)

The base station according to claim 54, wherein the processor is configured to read and execute program in a memory:
if the downlink control channel corresponds to a PUSCH transmitted in a special subframe, to determine that the uplink DCI format for the downlink control channel has a first DCI size; or if the downlink control channel corresponds to a PUSCH transmitted in a normal subframe, to determine that the uplink DCI format for the downlink control channel has a second DCI size; wherein the first DCI size is different from the second DCI size;
wherein the processor is configured to read and execute program in a memory to determine whether the downlink control channel corresponds to a PUSCH transmitted in a special subframe, according to a first indicating field in the downlink control channel, wherein the first indicating field carries an HARQ process number of the PUSCH corresponding to the downlink control channel
wherein the processor is configured to read and execute program in a memory:
if the downlink control channel corresponds to a PUSCH transmitted in a special subframe, to determine that the downlink control channel is scrambled using a first RNTI; or if the downlink control channel corresponds to a PUSCH transmitted in a normal subframe, to determine that the downlink control channel is scrambled using a second RNTI; wherein the first RNTI is different from the second RNTI;
wherein the processor is configured to read and execute program in a memory:
if the downlink control channel corresponds to a PUSCH transmitted in a special subframe, to set both a Least Significant Bit (LSB) and a Most Significant Bit (MSB) in the UL index to 0; and
if the downlink control channel corresponds to a PUSCH transmitted in a normal subframe, to set at least one of the LSB and the MSB in the UL index to 1.

### Claim 56 (depends on 55)

The base station according to claim 55, wherein if the RNTI corresponding to the special subframe is shared by a plurality of terminals, then the processor is configured to read and execute program in a memory:
to map the indicating fields for indicating whether to retransmit PUSCHs, of the plurality of terminals to corresponding positions in the downlink control channel corresponding to a special subframe according to indexes of the plurality of terminals.

### Claim 57 (depends on 53)

The base station according to claim 53, wherein when the subframe m+k is different from a subframe detected for a downlink control channel corresponding to a PUSCH transmitted in a normal subframe, k is defined as follows:
for the TDD uplink-downlink configuration 1, if m is 1 or 6, then k will be 4 or 9; or
for the TDD uplink-downlink configuration 2, if m is 1 or 6, then k will be 3, 4, 5, 8, 9, or 10; or
for the TDD uplink-downlink configuration 3, if m is 1, then k will be 4, 5, 6, or 10; or
for the TDD uplink-downlink configuration 4, if m is 1, then k will be 3, 4, 5, 6, 9, or 10; or
for the TDD uplink-downlink configuration 5, if m is 1, then k will be 2, 3, 4, 5, 6, 8, 9, or 10.