Food safety
LATEST ISSUE IN SOFTWARE TESTING AND QUALITY: Infrastructure-based wireless networks provide convenient access to the Internet, and are becoming increasingly popular in spite of their costly wired deployment. On the other hand, mobile ad hoc networks (MANETs) eliminate the need for infrastructure, decreasing deployment time and alleviating network construction costs. However, having routing functions on all nodes in a MANET complicates the design of networking devices. The fact that MANET usage is typically limited to military and specialized civilian applications also hinders its growth. By combining an infrastructure-based wireless network and a MANET, a wireless mesh network (WMN) presents a low-cost and fast deployment solution compared to an infrastructure.
IEEE 802.11s introduces the unified channel graph (UCG), which presents one mesh sharing the same preferences in the same channel, to handle several meshes spanning different channels. When forming a new mesh, the initial MP randomly decides a channel precedence value and embeds that value in the management frames. After the channel scan, other MPs select the channel with the highest precedence as their operating channels. This procedure forms a UCG called the simple channel unification protocol. To resolve multiple UCGs in different channels due to spatial division and the needs of channel switching, such as radar detection, IEEE 802.11s proposes a channel graph switch protocol. In this protocol an MP sets a waiting timer and broadcasts a mesh channel switch announcement. The announcement contains the waiting period and a precedence value of the candidate channel. When the timer expires, the MPs receiving the announcement switch to a candidate channel with the highest precedence. This study also demonstrates that multichannel transmissions using a single switching radio improve effectively throughput without extra hardware costs. Future studies should further investigate the conditions that affect
IEEE 802.11s introduces the unified channel graph (UCG), which presents one mesh sharing the same preferences in the same channel, to handle several meshes spanning different channels. When forming a new mesh, the initial MP randomly decides a channel precedence value and embeds that value in the management frames. After the channel scan, other MPs select the channel with the highest precedence as their operating channels. This procedure forms a UCG called the simple channel unification protocol. To resolve multiple UCGs in different channels due to spatial division and the needs of channel switching, such as radar detection, IEEE 802.11s proposes a channel graph switch protocol. In this protocol an MP sets a waiting timer and broadcasts a mesh channel switch announcement. The announcement contains the waiting period and a precedence value of the candidate channel. When the timer expires, the MPs receiving the announcement switch to a candidate channel with the highest precedence. This study also demonstrates that multichannel transmissions using a single switching radio improve effectively throughput without extra hardware costs. Future studies should further investigate the conditions that affect