ith the serving BS to perform scanning. In addition, the MS may perform scanning procedure without interrupting its communication with the serving BS if the MS supports such capability, which requires dual or multiple radios. The MS selects the scanning candidate base stations by information obtained from the BS or information stored in the MS. The BS or MS may prioritize the neighbor base stations to be scanned based on various metrics, such as cell type, loading, received signal strength, and geographical location. As part of the scanning procedure, the MS measures the received RF signal strength from the selected base stations and reports the measurement results back to the serving BS. The measurements may be used by the MS or the network to determine the best target BS for handover. The measurements in IEEE 802.16 are a superset of those specified in the IEEE 802.16-2009 standard [1,2]. The serving BS defines triggering conditions and rules for the MS for sending the scanning report. Cell reselection refers to a process where an MS scans and/or associates with one or more base stations in order to determine their suitability, along with other performance considerations, as a handover target. The MS may incorporate information acquired from a neighbor advertisement message while searching neighbor base stations for cell reselection. The serving BS may schedule scanning intervals or sleep intervals to conduct cell reselection activity. Such procedure does not involve termination of existing connection to a serving BS. 4.1.4 Idle State The Idle State is intended as a mechanism to allow the MS to become periodically available for downlink broadcast messages without registration at a specific BS as the MS traverses across different cells, typically over a large geographical area. The Idle State benefits the MS by relaxing the requirement for handover and other normal operation signaling requirements in the Connected State. By restricting the MS activity to scanning in discrete intervals, the Idle State allows the 