Distributed Cross-layer Dynamic Route Selection in Wireless Multiuser Multihop Networks

TL;DR

This paper proposes two distributed cross-layer dynamic route selection schemes for wireless multiuser multihop networks, improving throughput while satisfying QoS constraints through adaptive routing based on network state and channel conditions.

Contribution

It introduces novel distributed cross-layer routing algorithms that adapt to network and channel states, enhancing performance in QoS-constrained multihop wireless networks.

Findings

The opportunistic scheme outperforms static routing under fading conditions.

The time division scheme offers a more efficient implementation with comparable performance.

Both schemes satisfy QoS constraints while maximizing weighted sum-rate.

Abstract

In wireless ad-hoc networks, forwarding data through intermediate relays extends the coverage area and enhances the network throughput. We consider a general wireless multiuser multihop transmission, where each data flow is subject to a constraint on the end-to-end buffering delay and the associated packet drop rate as a quality of service (QoS) requirement. The objective is to maximize the weighted sum-rate between source destination pairs, while the corresponding QoS requirements are satisfied. We introduce two new distributed cross-layer dynamic route selection schemes in this setting that are designed involving physical, MAC, and network layers. In the proposed opportunistic cross-layer dynamic route selection scheme, routes are assigned dynamically based on the state of network nodes' buffers and the instantaneous state of fading channels. In the same setting, the proposed time division cross layer dynamic route selection scheme utilizes the average quality of channels instead for more efficient implementation. Detailed results and comparisons are provided, which demonstrate the superior performance of the proposed cross-layer dynamic route selection schemes.