Multiplex communications – Channel assignment techniques – Polling
Reexamination Certificate
2004-12-28
2008-08-26
Nguyen, Duc (Department: 2617)
Multiplex communications
Channel assignment techniques
Polling
C370S338000, C370S346000, C370S445000, C370S458000, C455S435100, C455S509000
Reexamination Certificate
active
07418004
ABSTRACT:
A MAC method has three procedures: a prioritization procedure, a collision resolution procedure, and a polling procedure. The prioritization procedure employs the handshaking method to ensure that a high priority station can join the polling list earlier than a low priority station. The collision resolution procedure employs a tree-splitting algorithm to ensure all active stations that underwent the prioritization period can join the polling list in a bounded time. In the polling procedure, the AP allocates the TXOP for each admitted station and schedules the transmission order of all admitted stations. In addition, the AP broadcasts the schedule information in the V-POLL frame. A power-saving station can wake up at the start of the contention-free period. To conserve power, on inspecting the V-POLL frame, if a PS station finds that it cannot transmit nor receive data frames during the polling period, then that station may return to the doze state.
REFERENCES:
patent: 2002/0163928 (2002-11-01), Rudnick et al.
patent: 2004/0156351 (2004-08-01), Kim
patent: 2005/0047386 (2005-03-01), Yi
Bacon & Thomas PLLC
Institute for Information Industry
Nguyen Duc
Win Aung T
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