BASE STATION APPARATUS AND RETRANSMISSION CONTROL METHOD

• US 20150208278A1
• Filed: 03/31/2015
• Published: 07/23/2015
• Est. Priority Date: 09/16/2010
• Status: Active Grant

• Current Assignee: Sun Patent Trust
• Original Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Inventors: OIZUMI, Toru, NAKAO, Seigo
• Granted Patent: US 9,402,202 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1829 Arrangements specially adapted for the receiver end
• CPC Class Codes: H04L 1/1858 Transmission or retransmission of more than one copy of acknowledgement message
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04W 24/04 Arrangements for maintaining operational condition
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

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.

Claims

1. A base station apparatus comprising:

a transmitter which, in operation, transmits downlink data using a first component carrier and a second component carrier; and

a receiver which, in operation, receives a response signal which is a block of bits that indicates a plurality of error detection results of the downlink data for each of the first component carrier and the second component carrier generated at a communication partner apparatus, the response signal being mapped, 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 at the communication partner apparatus has failed is the same as a combination of the PUCCH resource and the phase point on which the response signal for a downlink data transmitted using only the first component carrier is mapped;

wherein the transmitter retransmits the downlink data when retransmission is indicated by the response signal received by the receiver.

2. The base station 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 base station 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 base station apparatus according to claim 1, wherein

when reception of the downlink data on the second component carrier at the communication partner apparatus has failed, and when a number of error detection results of the downlink data on the first component carrier is one, ACK signal is mapped on a phase point (−

1,

     0) and NACK signal is mapped on a phase point (1,

     0) for the downlink data on the first component carrier, 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 at the communication partner apparatus has failed (DTX) on all of the plurality of phase points; and

when reception of the downlink data on the second component carrier at the communication partner apparatus has failed, and when the number of error detection results of the downlink data on the first component carrier is two, ACK/ACK signal is mapped on a phase point (−

1,

     0), ACK/NACK signal on a phase point (0,

     1), NACK/ACK signal is mapped on a phase point (0, −

1), and NACK/NACK signal is mapped on a phase point (1,

     0) for the downlink data on the first component carrier, 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 at the communication partner apparatus has failed (DTX) on all of the plurality of phase points.

5. The base station 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 at the communication partner apparatus has failed, and when the number of error detection results of the downlink data on the first component carrier is one, ACK signal is mapped on a phase point (−

1,

     0) and NACK signal is mapped on a phase point (1,

     0) for the downlink data on the first component carrier, 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 at the communication partner apparatus has failed (DTX) on all of the plurality of phase points; and

when reception of the downlink data on the second component carrier at the communication partner apparatus has failed, and when the number of error detection results of the downlink data on the first component carrier is two, ACK/ACK signal is mapped on a phase point (−

1,

     0), ACK/NACK signal on a phase point (0,

     1), NACK/ACK signal is mapped on a phase point (0, −

1), and NACK/NACK signal is mapped on a phase point (1,

     0) for the downlink data on the first component carrier, 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 at the communication partner apparatus has failed (DTX) on all of the plurality of phase points.

6. The base station 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 base station 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:

transmitting downlink data using a first component carrier and a second component carrier;

receiving a response signal which is a block of bits that indicates a plurality of error detection results of the downlink data for each of the first component carrier and the second component carrier generated at a communication partner apparatus, the response signal being mapped, 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 at the communication partner apparatus has failed is the same as a combination of the PUCCH resource and the phase point on which the response signal for a downlink data transmitted using only the first component carrier is mapped; and

retransmitting the downlink data when retransmission is indicated by the received response signal.

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 a downlink control information on a first component carrier, 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 at the communication partner apparatus has failed, and when a number of error detection results of the downlink data on the first component carrier is one, ACK signal is mapped on a phase point (−

1,

     0) and NACK signal is mapped on a phase point (1,

     0) for the downlink data on the first component carrier, 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 at the communication partner apparatus has failed (DTX) on all of the plurality of phase points; and

when reception of the downlink data on the second component carrier at the communication partner apparatus has failed, and when the number of error detection results of the downlink data on the first component carrier is two, ACK/ACK signal is mapped on a phase point (−

1,

     0), ACK/NACK signal on a phase point (0,

     1), NACK/ACK signal is mapped on a phase point (0, −

1), and NACK/NACK signal is mapped on a phase point (1,

     0) for the downlink data on the first component carrier, 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 at the communication partner apparatus has failed (DTX) on all of the plurality of phase points.

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 at the communication partner apparatus has failed, and when the number of error detection results of the downlink data on the first component carrier is one, ACK signal is mapped on a phase point (−

1,

     0) and NACK signal is mapped on a phase point (1,

     0) for the downlink data on the first component carrier, 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 at the communication partner apparatus has failed (DTX) on all of the plurality of phase points; and

when reception of the downlink data on the second component carrier at the communication partner apparatus has failed, and when the number of error detection results of the downlink data on the first component carrier is two, ACK/ACK signal is mapped on a phase point (−

1,

     0), ACK/NACK signal on a phase point (0,

     1), NACK/ACK signal is mapped on a phase point (0, −

1), and NACK/NACK signal is mapped on a phase point (1,

     0) for the downlink data on the first component carrier, 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 at the communication partner apparatus has failed (DTX) on all of the plurality of phase points.

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.