Communication system, a repeater terminal in a communication...

Multiplex communications – Communication over free space – Repeater

Reexamination Certificate

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C370S492000, C370S501000

Reexamination Certificate

active

07957334

ABSTRACT:
This invention provides a communication system, a repeater terminal in the communication system and a communication method for improving the characteristics in a multi-hop communication by a diversity gain and reduces the power consumption by wasteful retransmission in packet transmission at a wireless terminal. When a transmitter terminal S sends a packet first time, repeater terminals R1-R13perform a data transmission by retransmission at all the terminals which received the packet. When a transmitter terminal S sends a packet second time, a repeater terminal determines its own contribution based on the hop numbers of the repeating in the packet transmission and the return ACK (or NACK) repeating. The repeater terminal with a high contribution autonomously determines to be in “repeater mode” and the repeater terminal with a low contribution autonomously determines to be in “sleep mode”.

REFERENCES:
patent: 7005985 (2006-02-01), Steeves
patent: 7397864 (2008-07-01), Tarokh et al.
patent: 7483710 (2009-01-01), Kitazawa et al.
patent: 7636301 (2009-12-01), Sipola
patent: 2004/0160986 (2004-08-01), Perlman
patent: 2004-282268 (2004-10-01), None
patent: 2005-064963 (2005-03-01), None
patent: WO 03/032617 (2003-04-01), None
Erina Kojima; Takeo Fujii; Yukihiro Kamiya; Yasuo Suzuki; “OFDM Ad Hoc Network no tame no STBC o Mochiita Bunsan ARQ”; IEICE Technical Report, RCS2004-76 to 86; vol 104, No. 123, Jun. 11, 2004, ISSN 0913-5685; pp. 7 to 12.

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