# US 9,521,075 B2 · Communication device and communication control method

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- Number: US 9,521,075 B2
- Document ID: US9521075B2
- Status: Granted
- Kind: B2
- Application number: 14/474,675
- Filed: 2014-09-02
- Published: 2014-12-18
- Granted: 2016-12-13
- Earliest claimed: 2012-03-02
- Assignees: Fujitsu Limited
- Applicants: Fujitsu Limited
- Inventors: Taiji Kondo; Takao Ito; Satoshi Ikeda; Hiroaki Kawasumi; Yukio Hayashi; Katsumi Kobayashi; Satoshi Kurosawa; Koichi Ishibashi; Yoshihiko Shirokura
- Web page: https://patentgrep.com/patent/US9521075B2

## CPC

- H04L 45/70: {Routing based on monitoring results}
- H04L 45/26: {Route discovery packet}
- H04W 40/28: for reactive routing
- H04W 84/18: Self-organising networks, e.g. ad-hoc networks or sensor networks
- 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

A communication device is included in an ad hoc network in a reactive routing scheme. The communication device includes a receiving unit, a selecting unit, and a transfer control unit. The receiving unit receives a route request frame including overall quality information on routes through which the route request frame has passed. The selecting unit selects a route request frame to be transferred to another communication device based on the quality information, from the route request frames received by the receiving unit through a plurality of routes. The transfer control unit transfers the route request frame selected by the selecting unit to the another communication device, and discards the route request frame when a quality value indicated by the quality information of the route request frame is smaller than a predetermined reference value.

## Claims

### Claim 1

A communication device included in an ad hoc network in a reactive routing scheme, the communication device comprising:
a processor that executes a process including:
receiving a route request frame including overall quality information on routes through which the route request frame has passed;
selecting a route request frame to be transferred to another communication device based on the quality information, from the route request frames received at the receiving through a plurality of routes; and
transferring the route request frame selected at the selecting to the another communication device, and discarding the route request frame when a quality value indicated by the quality information of the route request frame is smaller than a predetermined reference value, wherein
the predetermined reference value is a value used for determining whether the communication device newly transfers the received route request frame to a neighboring communication device or discards the received route request frame at the communication device itself without transferring the received route request frame,
the selecting includes selecting the route request frame to be transferred by broadcast to the neighboring communication device and a peripheral communication device, based on the quality information, and
the transferring includes setting the predetermined reference value in the route request frame and transmitting the route request frame by broadcast.

### Claim 2 (depends on 1)

The communication device according to claim 1, wherein the quality information is information related to number of hops of the route request frame counted from a source, and quality of a plurality of links included in the routes.

### Claim 3

A communication control method executed by a communication device included in an ad hoc network in a reactive routing scheme, the communication control method comprising:
receiving a route request frame including overall quality information on routes through which the route request frame has passed;
selecting a route request frame to be transferred to another communication device based on the quality information, from the route request frames received through a plurality of routes; and
transferring the selected route request frame to the another communication device, and discarding the route request frame when a quality value indicated by the quality information of the route request frame is smaller than a predetermined reference value, wherein
the predetermined reference value is a value used for determining whether the communication device newly transfers the received route request frame to a neighboring communication device or discards the received route request frame at the communication device itself without transferring the received route request frame,
the selecting includes selecting the route request frame to be transferred by broadcast to the neighboring communication device and a peripheral communication device, based on the quality information, and
the transferring includes setting the predetermined reference value in the route request frame and transmitting the route request frame by broadcast.