In a mobile wireless ad-hoc network, nodes move about and relay packets destined for other nodes. One of the biggest challenges in this area is the design of scalable routing protocols. A family of routing protocols has emerged that is potentially more scalable than the protocols that discover and/or maintain end-to-end routes. These protocols are location-based-the network maintains nodes' approximate geographic locations and use the information to route packets. An important component of these protocols is the management of the location information at network nodes. We present one such scheme called SLALoM which scales well in large, mobile ad-hoc networks. In particular, we prove that under a specific environment the overhead cost of SLALoM is asymptotically lower than SLURP, the only other location management scheme that has been analyzed theoretically. We also provide simulation results that show our scheme performs well in comparison to SLURP under a variety of scenarios not incorporated into the analysis.

Analyses of four broadband fiber-optic subscriber loop architectures, including active (high-speed time division multiplexing (TDM)-based) and passive (dense wavelength division multiplexing (WDM)-based, WDM-based with an analog subcarrier-multiplexing overlay, and splitter-based) double-star topologies, are presented. The analyses focus on specific demonstrated architectures and use component cost projections based on learning curves to estimate future network costs on a per-subscriber basis. Also investigated is the sensitivity of projected cost-per-subscriber to remote multiplexing node size and to double-star prove-in distance. The results indicate that the four architectures have very different double-star prove-in distances and that loop costs are minimized for much smaller remote node sizes than active loops, thus permitting cost-effective deployment of passive loops for smaller groups of subscribers. In addition, cost breakdowns for the four architectures indicate that splitter-based passive loops share electronics more effectively among subscribers than loop architectures requiring dedicated (per-subscriber) electronic interfaces, resulting in projected cost advantages for the splitter-based networks.>

Facility hubbing, based on the use of high-speed digital cross-connect systems and alternative fiber network topologies, is analyzed for applications to BOC interoffice networks. The paper quantifies benefits for facility hubbing compared to metallic growth as well as point-to-point fiber transmission and considers alternative network transition strategies.