Mesh Design: Network Issues
We continue our discussion of traditional design problems in mesh networks, preparatory to the discussion of joint design in a following chapter. In this chapter, we focus on network-wide issues in mesh design, or issues that in some sense emerge at the n
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Mesh Design: Network Issues
4.1 Network-Level Design Challenges Some research areas that the literature has addressed in the past several years deal with issues that only emerge, or become meaningful, in the context of the entire network. Routing is, of course, the quintessential such problem. In this chapter, we continue our examination of the traditional mesh design problem areas by focusing on such issues. Other such issues relate to the planning and deployment of the entire network—the placement of nodes, or optimization of placement costs. Modeling capacity and performance—of the network, not individual links or locales—also falls into this category. Rate control is another issue we discuss, since it is traditionally a mechanism in combating congestion, an emergent network phenomenon—made more critical by the reality of wireless interference. We also consider cognitive mesh design under this umbrella of network-wide issues. As we mentioned before, the literature contains previous surveys of some of these topics, such as standard specific deployment issues (Bruno et al. 2005; Nandiraju et al. 2007), secure routing (Hu and Perrig 2004), multicast routing (Junhai et al. 2009), dynamic spectrum access (Akyildiz et al. 2006; Yucek and Arslan 2009). Table 4.1 is the companion to Table 3.1 summarizing our categorization of these areas. As before, they are intended purely as representative work, that may provide good starting points for the corresponding areas.
4.2 Routing Just as in any other network, finding out high throughput routing paths is a fundamental problem in WMNs. Wireless mesh networks inherit many of their characteristics from traditional ad-hoc networks. Due to lesser consideration of mobility, increasing traffic demand and certain infrastructure-like design properties, routing protocols for WMNs have required exclusive focus from researchers. Table 3 presents a classificaP. H. Pathak and R. Dutta, Designing for Network and Service Continuity in Wireless Mesh Networks, Signals and Communication Technology, DOI: 10.1007/978-1-4614-4627-9_4, © Springer Science+Business Media New York 2013
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4 Mesh Design: Network Issues
Table 4.1 Categorization of WMN problems (network-wide issues) Routing (Sect. 4.2)—Choosing routing paths to satisfy end-to-end traffic demands between nodes Objective: Low inter-path and intra-path interference, load balancing and hot-spot mitigation, higher reliability and throughput Sample Literature: Channel quality and diversity in multi-channel single-radio (So and Vaidya 2005) and multi-channel routing (Draves et al. 2004), opportunistic routing protocol (Biswas and Morris 2005), hot-spot analysis with straight line routing (Kwon and Shroff 2007) Rate control and congestion control (Sect. 4.5)—TCP-like congestion control methods that work despite loss and bias introduced by wireless medium, including multihop Objective: Throughput, congestion control, fairness Sample Literature: general TCP survey (Lochert et al. 2007), addressing spatial bias (Mancuso et al. 2010), neig
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