Patent ID: 7898979

Claim:
A wireless ad hoc communication system including a plurality of terminals, comprising: a first intermediate terminal which transmits an alternative route discovery request when the quality of a link connected to the first intermediate terminal deteriorates between a source terminal that transmits communication data and a destination terminal that receives said communication data; and a second intermediate terminal which is positioned upstream with respect to said first intermediate terminal between the source terminal and said destination terminal and which transmits data to said first intermediate terminal, wherein, said first intermediate terminal transmits a route error notification to said second intermediate terminal when said request fails, said second intermediate terminal transmits an another alternative route discovery request when said notification is received from said first intermediate terminal, a link state of an another alternative route, discovered as a result of said another alternative route discovery request, between said second intermediate terminal and said destination terminal is set as a candidate state, and said first intermediate terminal notifies said second intermediate terminal of route information on the link when the quality of the link connected to the first terminal deteriorates, and said second intermediate terminal includes a data buffer and retains in said data buffer said data transmitted to said first intermediate terminal when said notification is received from said first intermediate terminal.