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Communication system and communication method

A communication system and communication method technology, applied in wireless communication, transmission system, network topology, etc., to achieve the effect of reducing memory usage

Inactive Publication Date: 2018-03-09
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In the above-mentioned responsive method, since RREQ is broadcast for path construction, if path construction is performed to multiple nodes at the same time, multiple RREQs are broadcast to connect to each node, which may cause convergence in the network.

Method used

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  • Communication system and communication method

Examples

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Embodiment Construction

[0028] Hereinafter, embodiments of the communication system and the communication method disclosed in the present application will be described in detail with reference to the accompanying drawings. In addition, the communication system and communication method disclosed in this application are not limited by the description of the following embodiments.

[0029] First, the configuration of an ad hoc network system 1 according to an embodiment disclosed in this application will be described. figure 1 It is a diagram showing the functional configuration of the ad hoc network system 1 according to the present embodiment. Such as figure 1 As shown, the ad hoc network system 1 has: a gateway node 10; and a plurality of nodes 20, 30, 40, 50, 60, 70, 80 that perform ad hoc wireless communication with the gateway node 10 and have fixed locations. Hereinafter, frame transmission destined for the gateway node 10 is defined as communication in the uplink direction (uplink communicat...

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Abstract

An ad hoc network system (1) has a gateway node (10), and a plurality of nodes (20) to (80) that perform ad hoc wireless communication with the gateway node (10) and have fixed installation positions. A node (20) has a link quality evaluation unit (22), an uplink path construction unit (24), a communication unit (21), and a downlink path construction unit (25). A link quality evaluation unit (22) performs a route evaluation based on the hello frame based on only the reception result record of the hello frame for network formation, and the route evaluation is used for uplink communication to the gateway node (10). An uplink path construction unit (24) constructs an uplink path based on the above-mentioned path evaluation. The communication unit (21) performs uplink communication to the gateway node (10) regularly and at a predetermined frequency. A downlink path construction unit (25) constructs a downlink path from the gateway node (10) based on an uplink communication path to the gateway node (10).

Description

technical field [0001] The present invention relates to a communication system and a communication method. Background technique [0002] An ad hoc communication method in which communication nodes directly communicate with each other is used as a method for a plurality of terminals to communicate. As methods of route construction in ad hoc communication, there are known a proactive method and a reactive method. [0003] In the active method, each node on the network communicates (exchanges) with an adjacent node bidirectionally through a hello frame, thereby notifying the existence of its own node to the adjacent node and recognizing the existence of the adjacent node. By exchanging hello frames, a link is established at a point in time when both adjacent nodes can manage each other. The hello frame is exchanged as a regular 1-hop broadcast, but each node on the network exchanges the hello frame including the route information to the destination node, so that the transmiss...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W40/26H04W84/18H04L45/02
CPCH04W84/22H04W40/12H04L41/12H04L45/02H04W84/18
Inventor 近藤泰二伊藤孝男川角浩亮小原木敬祐小林克己中嶋好文黑泽怜志松原茂正城仓义彦
Owner FUJITSU LTD
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