Patent ID: 7751360
Filing Date: 2010-07-06
Classification: H04L,H04W,Y02D

Abstract:
1. A packet transmission system, comprising: a plurality of wireless basestations; and one or more wireless terminal devices belonging to one of the wireless basestations, wherein, the system employs a plurality of transmission trees created between the plurality of wireless basestations and based on a link cost between a target wireless basestation and at least one adjacent wireless basestation, the link cost based on a signal power level received from the at least one adjacent wireless basestation and an error rate of the at least one adjacent wireless basestation, each of the wireless basestations having a tree table for recording a root basestation in association with ID information about the transmission trees, each of the wireless basestations determines the transmission tree to be used for packet transmission when receiving a packet, and transmits the packet to another wireless basestation designated as a next node along the determined transmission tree, and each of the wireless basestations has a location table that records the one or more wireless terminal devices in association with a corresponding one of the wireless basestations, the location table being created by exchanging information, among the wireless basestations, about the one or more wireless terminal devices currently located under a corresponding basestation.