# US 2016/0262136 A1 · Terminal apparatus and retransmission control method

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- Number: US 2016/0262136 A1
- Document ID: US20160262136A1
- Status: Published application
- Kind: A1
- Application number: 15/157,065
- Filed: 2016-05-17
- Published: 2016-09-08
- 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/US20160262136A1

## 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 apparatus that communicates with a base station using a unit band group comprising a plurality of downlink unit bands and uplink unit bands, and transmits a response signal based on an error detection result of downlink data arranged in a downlink unit band through an uplink control channel of an uplink unit band corresponding to the downlink unit band, the terminal apparatus comprising:
a transmitter;
a receiver configured:
to receive downlink assignment control information transmitted through downlink control channels of the plurality of downlink unit bands;
to receive the downlink data transmitted through a downlink data channel indicated by the downlink assignment control information;
one or more processors configured:
to detect a reception error of the received downlink data; and
to control transmission of a response signal used for retransmission control of the downlink data in the base station based on the error detection result and success/failure in the reception of the downlink assignment control information;
to control the transmitter to transmit, when succeeding in receiving downlink assignment control information transmitted in a base unit band which is a downlink unit band in which a broadcast channel signal containing information on the uplink unit band in the unit band group is transmitted and a second downlink unit band other than the base unit band, the response signal to the base station using resources of the uplink control channel associated with the downlink control channel in the base unit band and provided for the uplink unit band, and
not to transmit, when receiving only the downlink assignment control information transmitted in the second downlink unit band, the response signal to the base station.

### Claim 2 (depends on 1)

The terminal apparatus according to claim 1, wherein the one or more processors are further configured:
to extract arrangement information indicating the number of downlink unit bands other than the base unit band where downlink data for the terminal is arranged from downlink assignment control information in the base unit band; and
to transmit negative acknowledgment as the response signal using resources of the uplink control channel when succeeding in receiving the downlink assignment control information transmitted in the base unit band and the number of downlink unit bands other than the base unit band successfully received is smaller than the number of downlink unit bands indicated by the arrangement information.

### Claim 3 (depends on 1)

The terminal apparatus according to claim 1, wherein the one or more processors are further configured to:
extract arrangement information indicating the presence or absence of an arrangement of downlink data with respect to the terminal in the base unit band from downlink assignment control information in a downlink unit band other than the base unit band, and
to transmit the response signal using resources of an uplink control channel associated with a downlink control channel in a downlink unit band other than the base unit band and provided in the uplink unit band when succeeding in receiving downlink assignment control information transmitted in a downlink unit band other than the base unit band and the arrangement information indicates that no downlink data is arranged for the terminal in the base unit band.

### Claim 4 (depends on 1)

The terminal apparatus according to claim 1, wherein the one or more processors are further configured:
to receive uplink assignment control information transmitted in one downlink control channel of the plurality of downlink unit bands; and
form a transmission signal based on uplink data and a response signal, forming, when succeeding in receiving downlink assignment control information transmitted in a base unit band which is a downlink unit band in which a broadcast channel signal containing information on an uplink unit band in the unit band group is transmitted and a second downlink unit band other than the base unit band, a transmission signal by frequency-multiplexing uplink data with a response signal by mapping uplink data to resources of an uplink data channel indicated by the uplink assignment control information and forming, when the control information receiving section succeeds in receiving only downlink assignment control information transmitted in the second downlink unit band, a transmission signal not including any response signal but including uplink data.

### Claim 5

A base station that communicates with a terminal 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 base station comprising:
a processor configured:
to set an indicator in the control information whether downlink data is provided in the downlink base unit band;
when a response signal from the terminal uses resources of an uplink control channel of an uplink unit band that forms a band pair with the base unit band, to make a determination that the response signal is for the downlink data provided in the downlink non-base unit band.

### Claim 6 (depends on 5)

The base station of claim 5, 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.

### Claim 7

A method in a base station that communicates with a terminal 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:
setting an indicator in the control information whether downlink data is provided in the downlink base unit band;
when a response signal from the terminal uses resources of an uplink control channel of an uplink unit band that forms a band pair with the base unit band, determining that the response signal is for the downlink data provided in the downlink non-base unit band.

### Claim 8 (depends on 7)

The method of claim 7, 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.