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    • 63. 发明专利
    • Wireless data communication system
    • 无线数据通信系统
    • JP2007243932A
    • 2007-09-20
    • JP2007023655
    • 2007-02-02
    • Hitachi Ltd株式会社日立製作所
    • TAKATANI YUKIHIROHAYASHI MASATOIKENOZA SHOTA
    • H04B7/26H04L12/28H04W16/26H04W28/00H04W36/14H04W36/30H04W48/18H04W74/08H04W76/02H04W84/12H04W84/18H04W88/06H04W88/08
    • H04W40/22H04L45/00H04L45/22H04L45/70H04W40/30H04W88/04
    • PROBLEM TO BE SOLVED: To provide a system with which a terminal promptly connects a cellular phone in place of a wireless LAN, when the wireless link quality deteriorates in a network where a plurality of communication media exist. SOLUTION: The communication system, where the first and third terminals belong to a second network, is provided with the first to third terminals belonging to a first network. The first terminal transmits a first packet generated by the first terminal to the second terminal through the first network. The second terminal monitors a path between the first terminal and the second terminal when receiving the first packet. The second terminal transmits a second packet to the third terminal when the prescribed conditions are satisfied after monitoring the path. The third terminal transmits the third packet which shows that the third terminal can connect to the second network, to the second terminal when receiving the second packet. COPYRIGHT: (C)2007,JPO&INPIT
    • 要解决的问题:当存在多个通信介质的网络中的无线链路质量恶化时,提供终端立即连接蜂窝电话代替无线LAN的系统。 解决方案:第一和第三终端属于第二网络的通信系统设置有属于第一网络的第一至第三终端。 第一终端通过第一网络向第二终端发送由第一终端生成的第一分组。 当接收到第一分组时,第二终端监视第一终端和第二终端之间的路径。 当在监视路径之后满足规定条件时,第二终端向第三终端发送第二分组。 第三终端在接收到第二分组时将发送第三终端的第三分组发送到第二终端。 版权所有(C)2007,JPO&INPIT