Reliability and security modeling in upgrading wireless backbone networks

Design for reliability of wireless networks presents some unique challenges due to the novelty of equipment involved (as opposed to mature circuit-switched networks) and a choice of new technologies. In this paper, we examine a wireless service provider network that needs to upgrade as trunks are reaching exhaust. A choice of upgrade solutions is available based on using a time division multiplexing (TDM) tandem switch or a packet tandem switch. Selecting the preferred solution raises some business continuity questions: Are there any identifiable strategies that improve the business proposition? Which is the preferred upgrade solution? How does each choice compare to the present mode of operations (PMO)? How does each choice compare to reliability and security requirements? We answer these and other reliability questions by examining the different call paths and traffic profiles. We include the effects of traffic growth and product reliability improvements (roadmaps) on the network reliability plus network security issues with emphasis on the modeling of vulnerabilities of the data path.