active connections associated with the MS. The Sleep Mode may be invocated when an MS is in the Connected State. When Sleep Mode is activated, the MS is provided with a series of alternate listening window and sleep intervals. The listening window is the time in which the MS is available to exchange control signaling, as well as data, in the uplink or downlink. The IEEE 802. provides a mechanism for dynamically adjusting the duration of sleep windows and listening windows based on changing traffic patterns and HARQ operations. The length of successive sleep cycles, each comprising a sleep and listening window, may remain unchanged or may change based on traffic conditions. The sleep and listening windows can be dynamically adjusted for the purpose of data transmission, as well as MAC control signaling. The MS can send and receive data and MAC control signaling without deactivating the Sleep Mode. Sleep Mode entry is initiated either by the MS or the BS. When the MS is in Active Mode, sleep parameters are negotiated between the MS and BS. The serving BS determines when the MS can transition to Sleep Mode. MAC control signaling is used for sleep mode request and response. The sleep cycle is measured in units of frames. The start of the listening window is aligned with the frame boundaries. The MS ensures that it has the latest system information for proper operation; otherwise, the MS does not transmit in the listening window until the system information is updated. A sleep cycle is the sum of sleep and listening windows. The MS or BS may request change of sleep cycle through MAC control signaling. The BS maintains synchronization with the MS at the sleep/listening windows' boundary. The synchronization can be conducted implicitly with a predetermined procedure or explicitly using an appropriate signaling mechanism. There are 16 distinct sleep patterns or sleep cycle settings (also referred to as power saving modes in the legacy system) specified in IEEE 802.16m where each is denoted by a unique Sleep Cycle Identif