Terminal apparatus and retransmission control method

• US 9,854,534 B2
• Filed: 05/17/2016
• Issued: 12/26/2017
• 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, Siego, Nishio, Akihiko, Imamura, Daichi
• Primary Examiner(s): Torres, Joseph D
• Application Number:
  US15/157,065
• Publication Number:
  US 20160262136A1
• Time in Patent Office: 588 Days
• 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 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

to control the transmitter not to transmit the response signal 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 the second downlink unit band.

2. 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.

3. 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.

4. 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.