Availability Constrained Traffic Control for AMC-Enabled Wireless Mobile Backhaul Networks

Mobile backhaul networks have been gaining importance due to the growing demand for mobile Internet. With faster wireless access speed, mobile backhaul networks need to keep up with the increasing demand. Mobile operators are adopting point-to-point wireless links with Adaptive Modulation and Coding (AMC) capability to cope with the increasing demand. However, AMC makes it hard to provide QoS guaranteed connection due to its fluctuating capacity. In this paper, we present a routing scheme for mobile backhaul networks to guarantee end-to-end communication availability in consideration of unstable capacity attributed to AMC. The routing scheme is composed of three techniques: finding highest-availability path, finding protection path, and bandwidth reallocation to optimize the bandwidth usage. Flows are admitted if searched path meets availability requirement. We have evaluated the performance of the routing scheme through simulation with various link conditions. We show that improvement of each technique is affected by link conditions.