# US 9,520,937 B2 · Radio communication system

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- Number: US 9,520,937 B2
- Document ID: US9520937B2
- Status: Granted
- Kind: B2
- Application number: 14/663,018
- Filed: 2015-03-19
- Published: 2015-07-09
- Granted: 2016-12-13
- Earliest claimed: 2009-01-20
- Assignees: Fujitsu Limited
- Applicants: Fujitsu Limited
- Inventors: Takayoshi Ode; Kazuhisa Obuchi
- Web page: https://patentgrep.com/patent/US9520937B2

## CPC

- H04B 7/15507: {Relay station based processing for cell extension or control of coverage area, (network planning with network coordinated processing with regard to cell extension H04W16/26; network topologies using dedicated repeater stations H04W84/047; terminal devices adapted for relaying to or from an other terminal H04W88/04)}
- H04B 7/0413: MIMO systems
- H04B 7/15514: {for shadowing compensation (for satellite mobile telephony service systems H04B7/18536)}
- H04B 7/15542: {Selecting at relay station its transmit and receive resources (selection of wireless resources by user or terminal H04W72/02; arrangements affording multiple use of the transmission path by two-dimensional division of the resources H04L5/0003, or by allocating sub-channels H04L5/003)}
- H04B 7/15557: {Selecting relay station operation mode, e.g. between amplify and forward mode, decode and forward mode or FDD - and TDD mode}
- H04B 7/2606: {Arrangements for base station coverage control, e.g. by using relays in tunnels}
- H04L 12/1863: {comprising mechanisms for improved reliability, e.g. status reports (arrangements for detecting or preventing errors by carrying supervisory signal the return channel H04L1/16)}
- H04L 12/189: {in combination with wireless systems (selective distribution or broadcast in wireless communication networks H04W4/06)}
- H04L 27/34: Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04W 72/30: Resource management for broadcast services
- H04W 84/12: WLAN [Wireless Local Area Networks]
- H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

In a radio communication system a first radio station performs communication by the use of a first radio signal. A second radio station receives a second radio signal which is indistinguishable from the first radio signal. A third radio station is in a radio communication area of the first radio station and a radio communication area of the second radio station. A communication format conversion unit generates a third radio signal by converting a communication format of the second radio signal to a communication format which is distinguishable from the first radio signal, and communicates with the third radio station by the use of the third radio signal.

## Claims

### Claim 1

A radio communication system comprising:
a first radio station which transmits data in a first radio format using a first redundant portion;
a second radio station which receives the data, converts the first radio format to a second radio format using a second redundant portion which differs from the first redundant portion in length and transmits the data by use of the second radio format; and
a third radio station which receives the data transmitted from the second radio Station;
wherein the first radio format includes a first radio channel and the second radio format includes a second radio channel being different from the first radio channel.

### Claim 2

A radio apparatus communicating with both a first radio station and a second radio station, the radio apparatus comprising:
a radio transmitter/receiver which performs communication with the first radio station or the second radio station by use of a radio format; and
a communication format converter which converts the radio format to a fist radio format using a first redundant portion in the case of communicating with the first radio station, and converts the radio format to a second radio format using a second redundant portion which differs from the first redundant portion in length in the case of communicating with the second radio station;
wherein the first radio format includes a first radio channel and the second radio format includes a second radio channel being different from the first radio channel.

### Claim 3

A radio apparatus communicating with a first radio station via a second radio station, the radio apparatus comprising:
a radio transmitter/receiver which performs communication with the second radio station in a second radio format using a second redundant portion which differs from a first redundant portion in length, the second radio format being different from a first radio format using the first redundant portion used by communication between the first radio station and the second radio station;
wherein the first radio format includes a first radio channel and the second radio format includes a second radio channel being different from the first radio channel.

### Claim 4

A radio communication method comprising:
transmitting, by a first radio station, data in a first radio format using a first redundant portion;
receiving, by a second radio station, the data, converting the first radio format to a second radio format using a second redundant portion which differs from the first redundant portion in length and transmitting the data by use of the second radio format; and
receiving, by a third radio station, the data transmitted from the second radio station;
wherein the first radio format includes a first radio channel and the second radio format includes a second radio channel being different from the first radio channel.