Downstream Backhaul Packet Control for Mobile Wireless Networks
Source: Ajou University
A backhaul network in mobile wireless systems consists of lower-level Base Stations (BSs) and upper-level Access Routers (ARs). While the legacy model considers only a queue at a BS for downstream traffic, the authors focus on queues at both the BS and the AR, hence calling it the split two-level queueing (S-2Q) model. The transmission rate of the backhaul link between a BS and an AR can be adjusted to stabilize the BS queue. The authors develop a queue-aware rate control algorithm for the backhaul link such that BS queues will suffer neither buffer overflow nor underflow due to drastic short-term variations in wireless channel condition. They then derive the stability conditions of BS queues and propose two strategies, each applicable to handoff and normal (non-handoff) users separately.