In a 10-gigabit-capable passive optical network (XG-PON) system, a power management function such as cyclic sleep mode can be implemented to increase energy efficiency of an optical network terminal (ONT). To optimize power saving with the cyclic sleep mode, we proposed an analytic model to determine required ONT buffer size for incoming traffics from user network interface (UNI) when the ONT is sleeping, and to evaluate performances such as power consumption and delay, in accordance with buffer sizes, sleep periods, and arrival rates. Then, by simulating the proposed model, we could estimate the required buffer size and the sleep period for effective implementation of the cyclic sleep mode.
To guarantee delay performances for timesensitive services in an orthogonal frequency-division multiple access passive optical network (OFDMA-PON), we propose a two-dimensional (i.e., subcarriers and time) upstream bandwidth allocation method based on interleaved polling with adaptive cycle time (IPACT). We first analyze its delay performance in terms of cycle time, i.e., the length of a polling cycle. Then, by setting the maximum polling cycle so as to guarantee timely transmissions for time-sensitive services, we identify the requirements, i.e., the maximum bandwidth allocation, the maximum number of allowed optical network units, and the optimum number of subcarriers, for upstream bandwidth allocation with delay guarantees. The proposed scheme is evaluated both numerically and via simulation.
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