Towards Cross-Layer Optimization of a Wireless Network for Diverse Rate and Delay Requirements
Vladimir V. Marbukh
This paper extends the conventional link-centric aggregate utility maximization framework to a situation of users (applications) with diverse delay as well as rate requirements. Assuming that user utility is a function of the average transmission rate as well as end-to-end packet delay, the cross-layer aggregate utility maximization over user transmission rates, routing and packet scheduling increases the aggregate utility as compared to conventional optimization over user transmission rates and routing only. Explicit inclusion of the end-to-end packet delays into user utilities may also lead to adequate and tractable resource allocation for users with stringent delay requirements affected by throughput fluctuations due to wireless link impairments and packet scheduling. The proposed cross-layer optimization framework relies on M / G / 1 packet-level queueing model for each link and assumes statistical independence of queueing models for different links. The M / G / 1 conservation laws play role of the constraints in the cross-layer optimization problem.
Flow Control, Routing, Scheduling, Utility and Optimization