# US 2013/0155960 A1 · Wireless communication apparatus

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- Number: US 2013/0155960 A1
- Document ID: US20130155960A1
- Status: Published application
- Kind: A1
- Application number: 13/818,950
- Filed: 2011-10-05
- Published: 2013-06-20
- Earliest claimed: 2010-10-06
- Assignees: Panasonic Corporation
- Inventors: Masayuki Anada; Takeru Usui
- Web page: https://patentgrep.com/patent/US20130155960A1

## CPC

- H04W 64/006: {with additional information processing, e.g. for direction or speed determination}
- H04L 25/0222: {Estimation of channel variability, e.g. coherence bandwidth, coherence time, fading frequency}
- H04L 27/2646: {using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length}
- H04L 27/2656: {Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation}
- H04W 56/00: Synchronisation arrangements
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 25/0216: {with estimation of channel length}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Provided is a wireless communication method wherein the transmission timing control that follows the movements of mobile stations can be performed. A transmission timing control information generating unit (8h) of a base station calculates transmission timings, at which a plurality of mobile stations transmit signals, on the basis of the delay times of the respective mobile stations measured by a delay time measuring unit (8f) and on the basis of the movement speeds of the respective mobile stations detected by a movement speed detecting unit (8i). The transmission timing control information generating unit (8h) generates and reports, to the mobile stations, control information indicating the calculated transmission timings.

## Claims

### Claim at position 1

1-4. (canceled)

### Claim 5

A radio communication apparatus for a base station that generates transmission timing control information using an OFDM modulation scheme between a mobile station and the base station, comprising:
a moving speed detection section that detects a moving speed of the mobile station;
a moving direction detection section that detects a moving direction of the mobile station;
a transmission timing offset calculation section that calculates an offset to be added to the transmission timing control information based on the moving speed and the moving direction detected at the moving speed detection section and the moving direction detection section; and
a transmission timing control information generation section that generates the transmission timing control information by adding the offset calculated at the transmission timing offset calculation section.

### Claim 6 (depends on 5)

The radio communication apparatus according to claim 5, wherein, when the mobile station is moving towards the base station, the transmission timing offset calculation section generates the transmission timing control information by adding an offset that results in a positive delay time difference between the base station and the mobile station.

### Claim 7 (depends on 5)

The radio communication apparatus according to claim 5, further comprising a control history storage section that stores the transmission timing control information, wherein
the frequency with which the transmission timing control information is generated is varied by the transmission timing control information generation section in accordance with control history in the control history storage section.