ABSTRACT
In this chapter, we study the problem of capacity planning for worldwide interoperability for microwave access (WiMAX) backhaul network based on IP transport. With backhaul networks forming the significant part of buildout cost, it is crucial to evaluate dimensioning approaches that facilitate cost-effective deployment of WiMAX networks. In this reference, we have considered models guaranteeing absolute and average delay requirements. We consider three kinds of source models: Poisson based, on-off based and leaky bucket (LB) filter based, and present explicit expressions capturing the required capacity. We compare the required capacity for average delay for these models with the required capacity for absolute delay and comment on the differential. Further, using simulation results, we study the average and variance of the observed delay for voice and video sources and compare the three models. We found that on-off and LB models are very powerful and ensure that the actual delays are less than the required delay and that the variance remains acceptable. These results seem to indicate that it may be possible to dimension systems based on average quality
of service (QoS) requirements and still get adequate performance for other requirements such as jitter. The results serve to highlight that wireless carriers need to take a closer look at average delay models in the face of high bandwidth cost, particularly in the WiMAX backhaul segment.
