of a mobile station (MS), increasing MS power efficiency has become an important issue. In
this paper, we analyze the sleep-mode operation for an efficient power saving mechanism
for delay-guaranteed services in the IEEE 802.16 e WMAN and observe the effects of the
operating parameters related to this operation. For the analysis we use the M/GI/1/K
queueing system with multiple vacations, exhaustive services and setup times. In the …