# US 10,455,516 B2 · Terminal apparatus and retransmission control method

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- Number: US 10,455,516 B2
- Document ID: US10455516B2
- Status: Granted
- Kind: B2
- Application number: 15/814,169
- Filed: 2017-11-15
- Published: 2018-03-22
- Granted: 2019-10-22
- Earliest claimed: 2009-04-21
- Assignees: Optis Wireless Technology, LLC
- Applicants: Optis Wireless Technology, LLC
- Inventors: Siego Nakao; Akihiko Nishio; Daichi Imamura
- Web page: https://patentgrep.com/patent/US10455516B2

## CPC

- H04W 52/22: taking into account previous information or commands
- H04H 20/71: Wireless systems
- H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)}
- H04L 1/16: in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L 1/1607: Details of the supervisory signal
- H04L 1/1621: {Group acknowledgement, i.e. the acknowledgement message defining a range of identifiers, e.g. of sequence numbers}
- H04L 1/1657: {Implicit acknowledgement of correct or incorrect reception, e.g. with a moving window}
- H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)}
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04W 8/08: Mobility data transfer
- H04W 24/04: Arrangements for maintaining operational condition
- H04W 28/04: Error control
- H04W 52/262: {taking into account adaptive modulation and coding [AMC] scheme}
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 74/006: {in the downlink, i.e. towards the terminal}
- H04L 5/0016: {Time-frequency-code}
- H04W 84/042: {Public Land Mobile systems, e.g. cellular systems}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04H: BROADCAST COMMUNICATION (multiplex communication H04J; pictorial communication aspects of broadcast systems H04N)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## 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

### Claim 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 and a downlink non-base unit band, the unit band group comprising control information, the terminal comprising:
a processor configured:
to transmit a response signal to the base station using resources of an uplink control channel associated with the downlink base unit band based upon receiving downlink assignment control information transmitted in the downlink unit band and the downlink non-base unit band;
not to transmit the response signal to the base station when either: (1) not receiving any downlink assignment control information, or (2) receiving an error detection result only about the downlink data information transmitted in a downlink non-base unit band.

### Claim 2 (depends on 1)

The terminal of claim 1, wherein the processor is configured to transmit the response signal as a bundled signal.

### Claim 3 (depends on 1)

The terminal of claim 1, wherein the processor is further configured to transmit the response signal on an uplink unit band paired with the downlink base unit band.

### Claim 4

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:
transmitting a response signal to the base station using resources of an uplink control channel associated with the downlink base unit band based upon receiving downlink assignment control information transmitted in the downlink unit band and the downlink non-base unit band;
not to transmit the response signal to the base when either: (1) not receiving any downlink assignment control information, or (2) receiving an error detection result only about the downlink data information transmitted in a downlink non-base unit band.

### Claim 5 (depends on 4)

The method of claim 4, further comprising transmitting the response signal as a bundled signal.

### Claim 6 (depends on 4)

The method of claim 4, further comprising transmitting the response signal on an uplink unit band paired with the downlink base unit band.