Network system, node, packet forwarding method, program, and recording medium
US9220047B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 2009 |
| Grant date | Dec 22, 2015 |
| Priority date | — |
| Expiry date | Jan 9, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W84/18
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
There are proposed: a network system capable of realizing packet forwarding higher in packet forwarding efficiency than in conventional Intermittent Periodic Transmit (IPT) using omni-directional antennas; and the like. Directional antennas are applied to the IPT, and each of slave nodes waits for reception of downlink packets by a directional antenna for receiving the downlink packets in a reception waiting state therefor. Moreover, the downlink packets are treated like polling control signals, and uplink packets are transmitted at a reception time of the downlink packets, whereby a hidden node problem and a carrier sensing problem can be avoided. Furthermore, in accordance with routing protocol in which each of nodes changes directivity randomly by a route formation process, it becomes possible to form a more suitable route.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.