Title:
無線MANネットワークにおける所定の伝送品質を維持する装置及び方法
Document Type and Number:
Japanese Patent JP5037585
Kind Code:
B2
Abstract:
A technique for maintaining a predefined transmission quality in a wireless Metropolitan Area Network (MAN). Each of a plurality of Local Area Networks are coupled to a corresponding router. Each router is coupled to one or more transceivers for interconnecting the routers via wireless links. Each router stores a table representative of the topology of the MAN and receives detected indicia representative of the quality of the wireless links and representative of network traffic loads. The router adapts the manner of transmission and the path of transmission according to the indicia. As a result, the MAN is highly efficient, in terms of cost, power and bandwidth utilisation. For example, a strength of a signal received over a wireless communication link is periodically monitored for maintaining the strength within a predefined range by adjusting the transmission power.; In addition, an error rate for the data received over the link is monitored. If the received signal strength remains below the predefined range despite the transmit power having been adjusted to a maximum allowable level, and if the error rate approaches a predefined limit, one or more techniques are selectively employed to reduce the error rate while maintaining a sufficiently high network throughput. The adaptive techniques include changing the data rate, modulation level, error correction coding, and spectrum spreading. In addition, a path for the data is preferably selected according to an Open-Shortest-Path-First algorithm, though one or more alternate paths can be selected for transmitting at least a portion of the data.
Inventors:
Torrent
Application Number:
JP2009244774A
Publication Date:
September 26, 2012
Filing Date:
October 23, 2009
Export Citation:
Assignee:
Wi-LAN Inc.
International Classes:
H04L27/00; H04W28/18; H04B7/005; H04B14/04; H04L1/00; H04L1/20; H04L29/06; H04W40/12; H04W52/24; H04W92/16
Domestic Patent References:
| JP8274756A | ||||
| JP8130530A | ||||
| JP3198546A | ||||
| JP63304737A | ||||
| JP8195699A | ||||
| JP5316205A | ||||
| JP10093584A | ||||
| JP63209234A | ||||
| JP6252896A | ||||
| JP5252165A | ||||
| JP2005057670A | ||||
| JP6232922A | ||||
| JP9083600A | ||||
| JP64000845A |
Foreign References:
| WO1994027382A1 |
Other References:
宮田修一,インテグレータがそっと教える効果的なネットワークの作り方無線LANの効能,コンピュータ&ネットワークLAN 96年11月号,日本,株式会社オーム社,1996年11月 1日,第14巻第11号(通巻第157号),pp. 26-28,最長接続距離450mの「FiRLAN」でEthernet、トークン・リング自由自在の環境をつくる方法
Attorney, Agent or Firm:
Yasuhiko Murayama
Masatake Shiga
Takashi Watanabe
Shinya Mitsuhiro
Masatake Shiga
Takashi Watanabe
Shinya Mitsuhiro