Abstract
Provided is a terminal device that is capable of improving the characteristics of a response signal having poor transmission characteristics when ARQ is utilized in communication using an uplink unit band and a plurality of downlink unit bands associated with the uplink unit band. At the time of channel selection a control unit ( 208) selects a resource used in sending a response signal from among specific PUCCH resources notified in advance from a base station (100) and PUCCH resources mapped to a CCE and controls the transmission of the response signal. A response signal generating unit (212) supports implicit signaling with respect to any given response signal and at the same time as supporting LTE fallback from 2CC uses a mapping method that between bits smooths the number of PUCCH resources that can determine ACK/NACK simply by determining the PUCCH resource regarding which the response signal had notified.
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Specification Information
Specification Information
Technologies
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Technologies
Resource configuration
Product
Use Cases
Wireless communication
Services
Claim
1. A terminal apparatus comprising:
a receiver which, in operation, receives downlink data transmitted using a first component carrier and a second component carrier;
response signal generating circuitry which, in operation, performs error detection of the downlink data for each of the first component carrier and the second component carrier, and generates a response signal which is a block of bits that indicates a plurality of error detection results of the downlink data;
mapping circuitry which, in operation, maps the response signal, according to a mapping table, to a phase point among a plurality of phase points on an uplink control channel resource (PUCCH resource) selected from a plurality of PUCCH resources, each PUCCH resource having a plurality of phase points, wherein a maximum value of a difference between a number of PUCCH resources where one of the plurality of error detection results indicates ACK only or NACK only on all of the plurality of phase points and a number of PUCCH resources where another one of the plurality of error detection results indicates ACK only or NACK only on all of the plurality of phase points is one or zero according to the mapping table, and wherein a combination of the PUCCH resource and the phase point on which the response signal is mapped when reception of the downlink data on the second component carrier has failed is the same as a combination of the PUCCH resource and the phase point on which the response signal for downlink data transmitted using only the first component carrier is mapped; and
transmitter which, in operation, transmits the mapped response signal using an uplink component carrier.
2. The terminal apparatus according to claim 1, wherein
a first PUCCH resource included in the plurality of PUCCH resources is a resource corresponding to a first CCE index of a plurality of Control Channel Elements (CCEs) which are used to transmit downlink control information, each CCE being a basic unit for mapping the downlink control information on a downlink control channel; and
a second PUCCH resource included in the plurality of PUCCH resources is a resource corresponding to a number which is a first CCE index plus one.
3. The terminal apparatus according to claim 1, wherein
among the first component carrier and the second component carrier, only the first component carrier is paired with the uplink component carrier.
4. The terminal apparatus according to claim 1, wherein
when reception of the downlink data on the second component carrier has failed,
the mapping circuitry, on the PUCCH resource where an error detection result of the downlink data on the second component carrier indicates that reception of the downlink data has failed (DTX) on all of the plurality of phase points:
maps, when a number of error detection results of the downlink data on the first component carrier is one, ACK signal on a phase point (?1, 0) and NACK signal on a phase point (1, 0) for the downlink data on the first component carrier; and
maps, when the number of error detection results of the downlink data on the first component carrier is two, ACK/ACK signal on a phase point (?1, 0), ACK/NACK signal on a phase point (0, 1), NACK/ACK signal on a phase point (0, ?1), and NACK/NACK signal on a phase point (1, 0) for the downlink data on the first component carrier.
5. The terminal apparatus according to claim 1, wherein
a number of error detection results of the downlink data on the first component carrier and a number of error detection results of the downlink data on the second component carrier are one and two or two and one,
when reception of the downlink data on the second component carrier has failed,
the mapping circuitry, on the PUCCH resource where the error detection result(s) of the downlink data on the second component carrier indicates that reception of the downlink data has failed (DTX) on all of the plurality of phase points:
maps, when the number of error detection results of the downlink data on the first component carrier is one, ACK signal on a phase point (?1, 0) and NACK signal on a phase point (1, 0) for the downlink data on the first component carrier; and
maps, when the number of error detection results of the downlink data on the first component carrier is two, ACK/ACK signal on a phase point (?1, 0), ACK/NACK signal on a phase point (0, 1), NACK/ACK signal on a phase point (0, ?1), and NACK/NACK signal on a phase point (1, 0) for the downlink data on the first component carrier.
6. The terminal apparatus according to claim 1, wherein
a number of the PUCCH resources is three and a number of the error detection results is three;
a number of the PUCCH resource(s) where two of the three error detection results indicate ACK only or NACK only is one; and
a number of the PUCCH resources where the other one of the three error detection results indicates ACK only or NACK only is two.
7. The terminal apparatus according to claim 1, wherein
a number of the PUCCH resources is four and a number of the error detection results is four;
a number of the PUCCH resources where two of the four error detection results indicate ACK only or NACK only is two; and
a number of the PUCCH resources where the other two of the four error detection results indicate ACK only or NACK only is two.
8. A communication method comprising:
receiving downlink data transmitted using a first component carrier and a second component carrier;
performing error detection of the downlink data for each of the first component carrier and the second component carrier, and generating a response signal which is a block of bits that indicates a plurality of error detection results of the downlink data;
mapping the response signal, according to a mapping table, to a phase point among a plurality of phase points on an uplink control channel resource (PUCCH resource) selected from a plurality of PUCCH resources, each PUCCH resource having a plurality of phase points, wherein, a maximum value of a difference between a number of PUCCH resources where one of the plurality of error detection results indicates ACK only or NACK only on all of the plurality of phase points and a number of PUCCH resources where another one of the plurality of error detection results indicates ACK only or NACK only on all of the plurality of phase points is one or zero according to the mapping table, and wherein a combination of the PUCCH resource and the phase point on which the response signal is mapped when reception of the downlink data on the second component carrier has failed is the same as a combination of the PUCCH resource and the phase point on which the response signal for downlink data transmitted using only the first component carrier is mapped; and
transmitting the mapped response signal using an uplink component carrier.
9. The communication method according to claim 8, wherein
a first PUCCH resource included in the plurality of PUCCH resources is a resource corresponding to a first CCE index of a plurality of Control Channel Elements (CCEs) which are used to transmit downlink control information, each CCE being a basic unit for mapping the downlink control information on a downlink control channel; and
a second PUCCH resource included in the plurality of PUCCH resources is a resource corresponding to a number which is a first CCE index plus one.
10. The communication method according to claim 8, wherein
among the first component carrier and the second component carrier, only the first component carrier is paired with the uplink component carrier.
11. The communication method according to claim 8, wherein
when reception of the downlink data on the second component carrier has failed,
the method further comprises, on the PUCCH resource where an error detection result of the downlink data on the second component carrier indicates that reception of the downlink data has failed (DTX) on all of the plurality of phase points:
mapping, when a number of error detection results of the downlink data on the first component carrier is one, ACK signal on a phase point (?1, 0) and NACK signal on a phase point (1, 0) for the downlink data on the first component carrier; and
mapping, when the number of error detection results of the downlink data on the first component carrier is two, ACK/ACK signal on a phase point (?1, 0), ACK/NACK signal on a phase point (0, 1), NACK/ACK signal on a phase point (0, ?1), and NACK/NACK signal on a phase point (1, 0) for the downlink data on the first component carrier.
12. The communication method according to claim 8, wherein
a number of error detection results of the downlink data on the first component carrier and a number of error detection results of the downlink data on the second component carrier are one and two or two and one,
when reception of the downlink data on the second component carrier has failed,
the method further comprises, on the PUCCH resource where the error detection result(s) of the downlink data on the second component carrier indicates that reception of the downlink data has failed (DTX) on all of the plurality of phase points:
mapping, when the number of error detection results of the downlink data on the first component carrier is one, ACK signal on a phase point (?1, 0) and NACK signal on a phase point (1, 0) for the downlink data on the first component carrier; and
mapping, when the number of error detection results of the downlink data on the first component carrier is two, ACK/ACK signal on a phase point (?1, 0), ACK/NACK signal on a phase point (0, 1), NACK/ACK signal on a phase point (0, ?1), and NACK/NACK signal on a phase point (1, 0) for the downlink data on the first component carrier.
13. The communication method according to claim 8, wherein
a number of the PUCCH resources is three and a number of the error detection results is three;
a number of the PUCCH resource(s) where two of the three error detection results indicate ACK only or NACK only is one; and
a number of the PUCCH resources where the other one of the three error detection results indicates ACK only or NACK only is two.
14. The communication method according to claim 8, wherein
a number of the PUCCH resources is four and a number of the error detection results is four;
a number of the PUCCH resources where two of the four error detection results indicate ACK only or NACK only is two; and
a number of the PUCCH resources where the other two of the four error detection results indicate ACK only or NACK only is two.
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