CBF evaluation through simulation

摘要

Blind Flooding is the simplest broadcasting operation used in a wireless mesh network (WMN) based IEEE 802.11s. However such mechanism can significantly degrade the network performance due to the considerable amount of broadcast traffic a WMN may face. Actually, routing relies heavily on layer two broadcasting and WMNs may bridge wired networks which deploy many broadcasting based application. In previous work we have designed an adaptive approach to control the forwarding of flooded messages into the mesh. The main focus of our previous simulations was to simulate the flooding process in wireless mesh network routing protocol, namely Hybrid Wireless Mesh Protocol (HWMP), which is using Blind Flooding. Generally, the results have shown a considerable amelioration of the network capacity specially with scaling. In this paper we evaluate our scheme, namely Control of Broadcast Forwarding (CBF), in comparison with Blind Flooding protocol. Our protocol is a self pruning algorithm where each node decides itself if or not to rebroadcast a flooded message based on packet type information element and 2-hop neighborhood knowledge. Simulations results show a significant reduction of broadcast cost while improving slightly the average end to end delay.