Wireless Mesh Networking Technology in Objective-C

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Wireless Mesh Networking Technology
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A mesh network is a network of equipment, called nodes, where each node directly communicates with multitudes of other nodes to create a network Each node in a mesh network serves as an ingress and egress point for network traffic, and the traffic flows through the network by hoping from one node to another node The term mesh signifies a key defining characteristic of the network, namely the existence of independent redundant data paths from one node to the other For example, a tree network is not considered a mesh network because it lacks redundant data paths between nodes Mesh also implies a generic topological structure where most nodes communicate directly with more than two other nodes A mesh network can be a regular mesh where nodes are interconnected to create a well-defined topological structure, such as a rectangular mesh network A mesh network can also be an irregular mesh where nodes are interconnected without any topological rules and in a seemingly random fashion Figure 94 illustrates regular and irregular mesh networks
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Regular mesh (Rectangular) Irregular mesh (No topological structure)
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Figure 94 Regular and irregular mesh networks
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A wireless mesh network is a mesh network in which the nodes are interconnected by means of wireless links such as RF or FSO Wireless mesh network technology has received significant attention recently, primarily due to the suitability of wireless technology for mesh networks and due to the development and proliferation of wireless technologies such as WiFi The benefits of wireless mesh networks have been widely appreciated, and several wireless mesh products are now offered by manufacturers In this section, we will discuss the attributes of wireless mesh networks, especially when used with optical wireless technology There are generally two types of wireless mesh networks: (1) point-to-point (PtP) mesh networks that are made up of nodes interconnected by means of point-to-point wireless links, and (2) point-to-multipoint (PtM) mesh networks that consist of nodes interconnected by means of point-to-multipoint links FSO being a PtP technology, the optical wireless mesh network discussed throughout the remainder of this chapter is a PtP mesh network However, it is valuable to discuss PtM mesh networks briefly PtM is a mesh network of nodes that use point-to-multipoint RF wireless technology to communicate with other nodes By virtue of having used a PtM RF wireless technology, the physical topology of a PtM mesh network does not have to be predefined and static The nodes can be nomadic or even mobile in certain cases This attribute makes PtM mesh networks ideally suited for ad-hoc networks where randomly distributed nodes communicate with each other to create a mesh network Unlike PtP mesh networks where every connection between two nodes has to be predefined, PtM mesh networks have the benefit of being dynamic in the sense that the number of neighboring nodes that a node can directly communicate with can be dynamic This facilitates the creation of a dense mesh network, giving it more redundancy PtM mesh networks have several limitations compared to PtP mesh networks Mostly, nodes in PtM mesh networks can communicate with only one other node at any given time, even though these nodes may be capable of communicating directly with multitudes of nodes at different times This is in contrast to PtP mesh networks, where a node can simultaneously communicate directly with more than one node at any given time This limitation results in the reduced capacity of a PtM network because not all direct communication links can be utilized at the same time Data traffic in PtM mesh networks also experience higher end-to-end latency and jitter, due to the higher delay experienced by data traffic at each hop Because PtM technology is a shared-medium technology, the underlying network capacity may also degrade beyond certain utilization The density of nodes in a geographical area may also be limited, and a complex spectral planning and routing algorithm may be needed in such PtM mesh networks FSO being a point-to-point wireless technology, the optical wireless mesh network discussed in this chapter falls under the category of PtP mesh networks Throughout the remainder of this chapter, the discussion of mesh networks is limited to PtP mesh networks We start by discussing the key attributes of wireless mesh networks, which make the technology highly attractive
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Redundancy Redundancy is one of the most valuable, if not the most valuable, attribute of a mesh network As stated previously, a mesh network is a network of
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