Capacity Expansion Capabilities in ODMA Systems

ODMA (Opportunity Driven Multiple Access) is an optional extension of the third generation mobile communication standard called UMTS (Universal Mobile Telecommunication System). It de-nes a special ad-hoc network, where each mobile node that wants to communicate has to connect to the base station with the assistance of the forthcoming mobile nodes. So in this ad-hoc network the destination is xed, although the topology of the system changes in time due to the mobility of the nodes. Using ODMA technology the mobile stations beyond the border of the coverage area associated with the base stations are still able to get service. Thus the capacity of the system raises, on the other hand the base stations can work in a spectrally eecient manner over a short range. This paper assumes a user oriented point of view in describing the capacity of the system, which denotes the probability of successful calls on the two dimensional surface.