Contention resolution protocol

Details Contention resolution protocol Contention resolution protocol

2006-03-07

2006-03-07

Jung, Min (Department: 2663)

Multiplex communications

Channel assignment techniques

Carrier sense multiple access

C370S461000, C370S462000

Reexamination Certificate

active

07009993

ABSTRACT:
A method for contention resolution in a transmission system (1) is described, the system (1) having a primary station (2) and a plurality of secondary stations (3) coupled to the primary station (2). Sign-On request messages are being sent by the primary station (2) marking starts of contention periods, numbered i=0, 1, 2 . . . , and having period length Pi; whereby a number Miof the secondary stations (3) sends a Sign-On response message to the primary station (2) in contention period i, and, after sending, waits a feedback period of length Tfbfor a response from the primary station (2). If Nidenotes the number of secondary stations (3) participating at the start of contention period i; an approximation for Misave for a possible constant factor reads:in-line-formulae description="In-line Formulae" end="lead"?Ni. Pi−1/(Pi−1+Tfb) for i=1, 2,  (1)in-line-formulae description="In-line Formulae" end="tail"?such that the respective period lengths Piare determined based on said approximation for Mi. An a posteriori estimate of Ni−1, save for a possible constant factor, is given by:in-line-formulae description="In-line Formulae" end="lead"?Sln (S/Ti−1e) withS=(Tfb+Pi−1)*Rin-line-formulae description="In-line Formulae" end="tail"?where R is the number of contention slots per time unit, and Ti−1edenotes the number of empty slots in an inspection interval having length Pi+Tfbtime units.

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