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US 9,854,534 B2Granted
Terminal apparatus and retransmission control method
AssigneeOptis Wireless Technology, LLC
InventorsSiego Nakao, Akihiko Nishio, Daichi Imamura
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AssigneeOptis Wireless Technology, LLC
InventorsSiego Nakao, Akihiko Nishio, Daichi Imamura
Estimating the term…
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.
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:
Dependencies are inferred from the claim text.
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TPC being performed according to specific parameters: taking into account previous information or commands
Arrangements characterised by transmission systems for broadcast: wireless systems
Arrangements for detecting or preventing errors in the information received: by repeating transmission, e.g. Verdan system
By using return channel: in which the return channel carries supervisory signals, e.g. repetition request signals
About 4 years 11 months of term left · ends 21 Sep 2031 (estimated)
The present invention relates to a terminal apparatus and a retransmission control method.
3GPP LTE adopts OFDMA (Orthogonal Frequency Division Multiple Access) as a downlink communication scheme. In a radio communication system to which 3GPP LTE is applied, a base station transmits a synchronization signal (Synchronization Channel: SCH) and a broadcast signal (Broadcast Channel: BCH) using predetermined communication resources. A terminal secures synchronization with the base station by catching the SCH first. The terminal then reads BCH information and thereby acquires parameters (e.g. frequency bandwidth) peculiar to the base station (see Non-Patent Literatures 1, 2, 3).
Furthermore, after completing the acquisition of the parameters peculiar to the base station, the terminal requests the base station for a connection and thereby establishes communication with the base station. The base station transmits control information to the terminal with which communication is established via a PDCCH (Physical Downlink Control CHannel) as required.
FIG. 1 is a diagram illustrating a method of spreading a response signal and reference signal;
FIG. 2A is a diagram illustrating a control sequence for an asymmetric carrier aggregation as applied to individual terminals in the manner shown in FIG. 2B;
FIG. 3 is a diagram illustrating ARQ control when carrier aggregation is applied to a terminal;
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same components among the embodiments will be assigned the same reference numerals and overlapping descriptions thereof will be omitted.
[Overview of Communication System]
A Communication System Including Base Station 100 and Terminal 200, which will be described later, performs communication using an uplink unit band and a plurality of downlink unit bands associated with the uplink unit band, that is, communication through asymmetric carrier aggregation peculiar to terminal 200. Furthermore, this communication system also includes a terminal that has no capability to perform communication through carrier aggregation unlike terminal 200 and performs communication through one downlink unit band and one uplink unit band associated therewith (that is, communication without carrier aggregation).