MAC layer scheduling strategies during handoff for wireless mobile multimedia networks

Abstract

Mobile multimedia systems must-amongst other things-account for user mobility in its network architecture. We present strategies for accommodating continuous service to mobile users via modifications in the design of the multiple access (MAC) protocol. More specifically, we focus on the adjustments required in the scheduling mechanism operating at base stations which grants access to mobile terminals by assigning them channels and time slots. In order to meet the needs to such mobile users, we propose a scheduler that uses anticipatory handoff indications from neighboring base stations to pre-assign slots for mobiles that are close to entering its coverage area. The paper examines the considerations necessary in pin-pointing such potential handoff mobiles. Additionally, an alternate MAC frame structure is presented to accommodate these potential users. Parameters that improve the reliability and utilization of these assignments are also studied.