Performance and design considerations for mobile mesh networks

Future networks will require a functionality that supports timely access to relevant data, voice and image information irrespective of the users' location and access to fixed facilities. This paper summarizes the results of our research on mobile mesh network (mmNET) system requirements necessary to support nomadic users engaged in distributed computing and information distribution. Our model of the mmNET consists of a set of low-power, radio frequency (RF) transceivers that move relative to each other across a geographical area subject to RF propagation impairments. The low power defines a radio coverage area that limits the number of neighbors but optimizes the throughput per unit area. The combination of low power and propagation environment, however, produces a network characterized by stochastic link failures. The rapidity of these failures and the perturbations to the network topology places severe constraints on the network management policies. We model the progression of user services from a highly reliable, static network environment to one characterized by chaotic connectivity. The basic premise of this view of a mmNET is that host mobility may place the subscriber in a situation that prevents a priori knowledge of any predetermined location. The impact of adaptive (e.g., "smart") antennas on the system capabilities is discussed. Meeting subscriber requirement across this diverse range of scenarios demands a robust, flexible information transport approach to deliver all the required information.