Investigations on enhanced power saving mechanism for IEEE 802.16m network with heterogeneous traffic

In this paper, power management mechanisms for IEEE 802.16m network using power saving class (PSC) are suggested for heterogeneous traffic. The proposed algorithms, namely, combined cyclic binary exponent (CCBE), combined anti-cyclic binary exponent (CABE) and combined truncated binary exponent (CTBE) are derived by combining the existing PSC-I and PSC-II with appropriate modifications. The mobile station (MS) with existing PSC-I, PSC-II and combined PSC (CPSC) suffers from high response delay and/or more energy consumption if the packet interarrival time of heterogeneous traffic increases. The main reason behind reduced performance is due to the fixed position and duration of the listen interval in these PSC. To optimize the listen interval, the sleep interval of PSC-I is customized to realize the three proposed algorithms. In addition, the modified sleep interval of PSC-I is combined with fixed sleep interval of PSC-II. Finally, the resultant combined PSC is formulated by applying a scaling rule that minimizes and positions the duration of listening interval by referring the current listen interval of PSC-II. The performance of three PSC is studied by varying the interarrival time, minimum and maximum sleep intervals at the MS. It is observed with CCBE algorithm, the number of listen intervals, response delay and power consumption is reduced by 8.02%, 22.71% and 15.60%, than CABE, respectively. Similarly, CCBE shows an improvement of 28.62%, 25.24% and 31.97% than CTBE algorithm. Also, the performance of CCBE is improved by 57.82%, 89.67% and 64.16% than conventional CPSC algorithm.