Abstract
In this paper, we study the performances of the registration protocol
in Ethernet passive optical networks (EPONs). In each registration process,
the newly-connected optical network units (ONUs) send their requests to the
optical line terminal (OLT) without any scheduling, which may cause collisions
and lower the registration success probability. Thus, a random-delay based
registration protocol has been defined in the IEEE 802.3av standard to prevent
collisions. Intuitively, the registration protocol of EPON possesses similar
characteristics as medium access control (MAC) protocols. Based on this principle,
we derive the closed-form expression of the registration throughput to evaluate
the random-delay based protocol. We show that an optimal discovery-window
size can be determined by maximizing the registration efficiency. Our analytical
results indicate that the random delay introduced in the protocol is helpful
to enhance the registration efficiency when the number of ONUs is large, or
if all ONUs are clustered. However, the throughput improvement by random delay
is marginal if there is only a small number of evenly distributed ONUs in
the vicinity of EPON.
© 2012 IEEE
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