Using SNR to Improve Multi-Hop Routing

Abstract

This paper analyzes the use of link quality, based on the Signal to Noise Ratio, as a metric to improve routing in multi-hop wireless networks. We compare the behavior and performance with those of other approaches, namely a simple minimum-hop selection process, as well as the Expected Transmission Count (ETX) metric, which has recently gathered relevant attention from the scientific community. We use a simulation based analysis, but we account for a realistic channel model, able to mimic the Gray Zones effect, which has been proven to have a great impact on wireless-based communications in general and over multi-hop topologies in particular. The results show that important improvements can be brought about by making use of the proposed metric to enhance route selection procedures.

Selective Route Based on SNR with Cross-Layer Scheme in Wireless Ad Hoc Network

“…A mechanism to improve multihop routing using SNR by adding the SNR information into RREQ was proposed in [17]. This scheme used the average route quality as the ratio between the overall path quality and the number of hops.…”

“…On the other hand, [15] and [16] proposed a routing metric that considered the expected transmission time and high throughput route selection with medium time metric, respectively. In the case of QoC, a mechanism to improve multihop routing using SNR by adding the SNR information into Route Request (RREQ) was proposed in [9,17]. The use of SNR and Receive Power (RP) to find the route was proposed by [18,19] by adding up the SNR information into Route Reply (RREP) mechanism.…”