Terminal apparatus and retransmission control method

• US 9,369,967 B2
• Filed: 08/12/2015
• Issued: 06/14/2016
• Est. Priority Date: 04/21/2009
• Status: Active Grant

• Current Assignee: Optis Wireless Technology, LLC (Brevet Capital)
• Original Assignee: Optis Wireless Technology, LLC (Brevet Capital)
• Inventors: Nakao, Seigo, Nishio, Akihiko, Imamura, Daichi
• Primary Examiner(s): Torres, Joseph D
• Application Number:
  US14/824,808
• Publication Number:
  US 20150365197A1
• Time in Patent Office: 307 Days
• US Class Current: 1/1
• CPC Class Codes: H04H 20/71 Wireless systems
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/16 in which the return channel carries supervisory signals, e.g. repetition request signals
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 1/1621 Group acknowledgement, i.e. the acknowledgement message defining a range of identifiers, e.g. of sequence numbers
• CPC Class Codes: H04L 1/1657 Implicit acknowledgement of correct or incorrect reception, e.g. with a moving window
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• 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: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 24/04 Arrangements for maintaining operational condition
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 52/22 taking into account previous information or commands
• CPC Class Codes: H04W 52/262 taking into account adaptive modulation and coding [AMC] scheme AMC per se H04L1/0001
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 8/08 : Mobility data transfer
• CPC Class Codes: H04W 84/042 : Public Land Mobile systems, e.g. cellular systems

Abstract

A terminal apparatus and retransmission control method reduces overhead of the uplink control channel in cases when ARQ is applied in communication that uses an uplink unit band and a plurality of downlink unit bands associated with the uplink unit band. A first condition is set in which downlink assignment control information is transmitted from a base station by a unit band group which comprises a basic unit band, which is the downlink unit band on which a broadcast channel signal including information relating to the uplink unit band is transmitted, and a second downlink unit band other than the basic unit band. A bundling unit will not transmit a response signal to the base station in certain cases.

Claims

1. A terminal that communicates with a base station using a unit band group comprising a plurality of downlink unit bands and uplink unit bands, the plurality of downlink unit bands comprising a downlink base unit band a downlink non-base unit band, the unit band group comprising control information, the terminal comprising:

a processor configured to at least;

make a determination from the control information whether downlink data is provided in the downlink base unit band;

when the determination indicates that downlink data is not provided in the downlink base unit band, generate a response signal to the base station regarding the downlink non-base band unit using resources of an uplink control channel of an uplink unit band that forms a band pair with the base unit band.

2. The terminal of claim 1, wherein the resources of the uplink control channel of the uplink unit band that forms the band pair with the base unit band comprises control channel elements (CCEs) to which downlink assignment control information received in a downlink unit band is mapped.

3. The terminal of claim 1, wherein the processor is further configured, when the determination indicates that downlink data is provided in the downlink base unit band but reception of downlink assignment control information received in the downlink base unit band has failed, to not transmit a response signal to the base station.

4. The terminal of claim 1, wherein the processor is further configured to make the determination using a signal bit in a downlink unit band other than the base unit band.

5. The terminal of claim 1, wherein the processor is further configured to at least:

acquire identification numbers of control channel elements (CCEs) to which the downlink assignment control information in the downlink unit band is mapped;

identify resources of the uplink control channel corresponding to the identification numbers of the acquired CCEs using a same correspondence as an association between CCEs of the downlink control channel of the base unit band and resources of the uplink unit band that forms a band pair with the base unit band.

6. A method in a terminal that communicates with a base station using a unit band group comprising a plurality of downlink unit bands and uplink unit bands, the plurality of downlink unit bands comprising a downlink base unit band a downlink non-base unit band, the unit band group comprising control information, the method comprising:

making a determination from the control information whether downlink data is provided in the downlink base unit band; and

when the determination indicates that downlink data is not provided in the downlink base unit band, transmitting a response signal regarding the downlink non-base band unit to the base station using resources of an uplink control channel of an uplink unit band that forms a band pair with the base unit band.

7. The method of claim 6, wherein the resources of the uplink control channel of the uplink unit band that forms the band pair with the base unit band comprises control channel elements (CCEs) to which downlink assignment control information received in a downlink unit band is mapped.

8. The method of claim 6, wherein the method further comprises, when the determination indicates that downlink data is provided in the downlink base unit band:

determining a failure to make reception of downlink assignment control information received in a downlink base unit band and, as a result of the failure,

not transmitting a response signal to the base station.

9. The method of claim 6, further comprising making the determination using a signal bit in a downlink unit band other than the base unit band.

10. The terminal of claim 6, further comprising:

acquiring identification numbers of control channel elements (CCEs) to which the downlink assignment control information in the downlink unit band is mapped;

identifying resources of the uplink control channel corresponding to the identification numbers of the acquired CCEs using a same correspondence as an association between CCEs of the downlink control channel of the base unit band and resources of the uplink unit band that forms a band pair with the base unit band.