원문정보
초록
영어
ETX (Expected Transmission Count) is a well-known link quality metric which has been widely used to find reliable paths between sources and destinations in wireless networks. However, the performance of ETX worsens as the traffic load increases. In this work, we investigate the causes of the instability of ETX under high traffic load and show that the high increase of route request packets significantly affects ETX link metric values. To address this problem, this paper proposes a new link quality estimation metric called HETX (High Load – Expected Transmission Count). Simulations are conducted to compare the performance of three metrics – HETX, ETX and minimum hop-count. The simulation results show that HETX outperforms ETX and minimum hop-count under high load while it performs as well as ETX under light load.
목차
1. Introduction
2. Related Work
3. Expected Transmission Count (ETX)
3.1. ETX Characteristic Under High Load
3.2. Route Instability Under High Load and Impact Of Route Request Packets
3.3. A variation of ETX under High Load
4. LQDV (Link Quality Distance Vector)
4.1. LQDV Route Discovery
5. Performance Evaluation
5.1. Route Request Packet Traffic
5.2. Comparison of Route Throughput, Delivery Ratio
5.3. Comparison of end-to-end Delay and Delay Jitter
5.4. Route Atability
6. Conclusions
Acknowledgements
References