Patent ID: 7113495
Filing Date: 2006-09-26
Classification: H04L,H04W,Y02D

Abstract:
1. A data transmission method in a relay transmission type radio network including a core node connected to a wire network, relay nodes relaying a down-link packet transmitted from said core node and an up-link packet directed toward said core node and a terminal station capable of transmission and reception of packet with both of said core node and said relay node, comprising: a registration step for registering with a relay node list held by the node, as a pair, ID information on said terminal station and a relay source node included in the up-link packet transmitted by said terminal station, in each of said core node and said relay node; a selection step for selecting a down-link relay route of the down-link packet addressed to said terminal station on the basis of said relay node list, in each of said core node and said relay node; a step for periodically transmitting a broadcast packet to said terminal station in each of said core node and said relay node; a connection node determination step for receiving said broadcast packet and determining a connection node out of said core node and said relay node in said terminal station; a step for transmitting to said connection node an up-link ACK packet, as said up-link packet, including the ID information on said terminal station and directed toward said core node following a predetermined up-link relay route in said terminal station; and a step for, in each of said relay nodes, setting on said received up-link ACK packet the ID information on the relay node as the ID information on said relay source node and transmitting it to a relay destination node, wherein, in the relay node having received said up-link ACK packet, if the pair of the ID information on said terminal station and said relay source node included in the up-link ACK packet is already registered with said relay node list held by the relay node, the up-link ACK packet is not transmitted to the relay destination node.