XPRESS: A Cross-Layer Backpressure Architecture for Wireless Multi-Hop Networks
Contemporary wireless multi-hop networks operate much below their capacity due to the poor coordination among transmitting nodes. In this paper, the authors present XPRESS, a cross-layer backpressure architecture designed to reach the full capacity of wireless multi-hop networks. Instead of a collection of poorly coordinated wireless routers, XPRESS turns a mesh network into a wireless switch. Transmissions over the network are scheduled using a throughput-optimal backpressure algorithm. Realizing this theoretical concept entails several challenges, which they identify and address with a cross-layer design and implementation on top of their wireless hardware platform.