Wireless MESH network Tami Alghamdi

Mesh Architecture – Mesh access points (MAPs). – Mesh clients. – Mesh points (MPs) – MP uses its Wi-Fi interface to both access the network itself and to relay traffic from other mesh points. – MPs and MAPs support WLAN mesh services, allowing them to forward packets on behalf of other nodes to extend the wireless transmission range. Mesh clients can associate with MAPs but not with MPs. Mesh portals are MAPs connected to a distribution system or a non IEEE network.

Physical Layer Efficient utilization Robustness to interference. Example: fading, delay spread, co-channel. Antenna diversity, smart antenna are suggested, but cost a lot .

Routing Routing is the process of selecting paths in a network. In weird network: – Distance vector protocol: best path on how far the destination. – Link state protocol: best path on link variable like, bandwidth, delay and reliability.

WMN Routing routing metrics. – Expected Transmission Count (ETX) This metric calculates the expected number of transmissions needed to send a frame over a link. – Expected Transmission Time (ETT) ETT estimates the MAC layer duration needed for successfully transmitting a packet. ETT is a bandwidth- adjusted ETX, and is generated by multiplying the link bandwidth to obtain the time spent in transmitting the data packet.

Application Broadband Home Networking: Mesh networking is needed to resolve the location of the access points problem in home networking. The access points must be replaced by wireless mesh routers with mesh connectivity established among them. Therefore, the communication between these nodes becomes much more flexible and more robust to network faults and link failures.

Building Automation: Access points are replaced by WMNs and thus the deployment cost will be significantly reduced. The deployment process is also much simpler due to the mesh connectivity among wireless routers.

Corn Using fewer wires means it costs less to set up a network, particularly for large areas of coverage. The more nodes you install, the bigger and faster your wireless network becomes. Mesh networks are "self configuring;" the network automatically incorporates a new node into the existing structure without needing any adjustments by a network administrator.

Mesh networks are "self healing," since the network automatically finds the fastest and most reliable paths to send data, even if nodes are blocked or lose their signal. Wireless mesh configurations allow local networks to run faster, because local packets don't have to travel back to a central server.