3.3. WIRELESS MESH NETWORK In [3], Wireless Mesh Network (WMN) is a highly promising technology and it plays an important role in the next generation wireless mobile network. WMNs have emerged as important architectures for the future wireless communications. WMNs consist of mesh routers and mesh clients, and could be independently implemented or integrated with other communication systems such as the conventional cellular systems. In addition, WMN are dynamic self-organized, self-healed, and self-configured, and enable quick deployment, easy maintenance, low cost, high scalability and reliable service. WMN is an ad-hoc network extension and is becoming an important mode complimentary to the infrastructure based wireless networks because they can enhance network capacity, connectivity and resilience. We can define a WMN as a network that has a network topology of either a partial or full mesh topology. In practice, WMNs are characterized by static wireless relay nodes which provide a distributed infrastructure for client nodes over a partial mesh topology. Due to the presence of partial mesh topology, a WMN utilizes multi-hop relaying like other ad hoc wireless networks. Important Issues in Wireless Mesh Networks In this section we discuss important aspects that must be taken into account in wireless mesh networks, such as the throughput capacity, scalability, fairness, reliability and robustness, and resource management [14]. Theoretical Throughput Capacity In data communication systems, throughput is defined as the number of bits, or characters (data) per unit of time that is delivered over a wired or wireless medium. As an example, we could say that throughput is the amount of data per second passing through a wire connecting two computers. Then, the total network capacity is the maximum throughput of a node or communication link. In WMNs, one of its big limitations is the network capacity. The theoretical upper limit of every node throughput capacity is asymptotically limited by (1/√n) where n is the number of nodes in the network. Therefore, increasing the number of nodes, the throughput capacity per node becomes unacceptably low. In general, the throughput capacity achievable in a WMN is proportional to the (W × n−1/d) where d is the dimension of the network and W is the total bandwidth. One approach to improve the throughput capacity is the use of multiple radio and fine tuned protocols.
3.3. WIRELESS MESH NETWORK In [3], Wireless Mesh Network (WMN) is a highly promising technology and it plays an important role in the next generation wireless mobile network. WMNs have emerged as important architectures for the future wireless communications. WMNs consist of mesh routers and mesh clients, and could be independently implemented or integrated with other communication systems such as the conventional cellular systems. In addition, WMN are dynamic self-organized, self-healed, and self-configured, and enable quick deployment, easy maintenance, low cost, high scalability and reliable service. WMN is an ad-hoc network extension and is becoming an important mode complimentary to the infrastructure based wireless networks because they can enhance network capacity, connectivity and resilience. We can define a WMN as a network that has a network topology of either a partial or full mesh topology. In practice, WMNs are characterized by static wireless relay nodes which provide a distributed infrastructure for client nodes over a partial mesh topology. Due to the presence of partial mesh topology, a WMN utilizes multi-hop relaying like other ad hoc wireless networks. Important Issues in Wireless Mesh Networks In this section we discuss important aspects that must be taken into account in wireless mesh networks, such as the throughput capacity, scalability, fairness, reliability and robustness, and resource management [14]. Theoretical Throughput Capacity In data communication systems, throughput is defined as the number of bits, or characters (data) per unit of time that is delivered over a wired or wireless medium. As an example, we could say that throughput is the amount of data per second passing through a wire connecting two computers. Then, the total network capacity is the maximum throughput of a node or communication link. In WMNs, one of its big limitations is the network capacity. The theoretical upper limit of every node throughput capacity is asymptotically limited by (1/√n) where n is the number of nodes in the network. Therefore, increasing the number of nodes, the throughput capacity per node becomes unacceptably low. In general, the throughput capacity achievable in a WMN is proportional to the (W × n−1/d) where d is the dimension of the network and W is the total bandwidth. One approach to improve the throughput capacity is the use of multiple radio and fine tuned protocols.