*3.3.3 Hierarchical routing*

*Wireless Mesh Networks - Security, Architectures and Protocols*

WMN for better performance.

uted MAC.

stability.

**3.3 Routing layer**

• Scalability

• Robustness

*3.3.2 Multipath routing*

• Multipoint to multipoint communication is possible with the help of distrib-

• Self-healing and self-organization of node are the prime requirements of

• Communication between the node and the node which are located far (multihop distances) from the source node should be proper for providing better

• MAC protocol is designed in such a fashion that WMN can work simultane-

Though various routing protocols are available for ad hoc networks, it cannot be directly used for wireless mesh networks. It is still a big research to perform modifications of the available protocol to be adopted for WMN. There are the same salient

Various routing algorithms in ad hoc network are available with any one of the above features, but not with all which makes it difficult to adopt with the mesh network. Some of the routing concepts for mesh network are as follows.

In MR-LQSR, a metric called weighted cumulative expected transmission time (WCETT) is used for measuring the system performance. In WCETT, link quality and minimum number of hop counts are considered as a system metric which

The objective of multipath routing is to provide load balancing and fault tolerance. Between the source and destination, multiple paths are predicted. When the shortest path link breaks, it can be easily switched over to other available paths. This results in better system performance by reducing the waiting time for computing the path at the time of fault. It also improves throughput and reduces end-to-end delay and fault tolerance. Still complexity exists with the multipath routing as it has to keep record of multipath always even if there is no breakage or

• Even less mobility influences the system performance of MAC.

ously with both single and with multiple channels.

• Energy-efficient routing algorithm suits for mesh network

*3.3.1 Multi-radio link quality source routing (MR-LQSR)*

results in better throughput and less delay.

features that WMN should provide with which are:

• Various performance metrics

**8**

fault.

Hierarchical routing protocols show better performance when there is dense number of nodes in the network. This is due to fast setup procedure, reduced overheads, and shortest routing path. Complexity is higher on maintaining the hierarchy and directly relates to the performance of the system.
