Abstract - Current wireless systems are called vendor-centralsystems because, users should subscribe to a serviceprovider (vendor) and receive the service through thespectrum assigned to that vendor at all times. Vendorcentralsystems suffer from low utility performance definedin terms of spectrum efficiency, blocking rate, and revenue.Variety dynamic channel allocation schemes have beenproposed to address the weak utility performance ofvendor-central systems.In this work, a futuristic user-central wireless systemarchitecture that leads to an ultimate freedom in channelallocation will be introduced. This architecture isimplemented based on the capabilities of cognitive radios. Inuser-central systems, a user has the freedom of receiving theservice through a1n optimum vendor at any time instanceand geographical location. The optimum vendor is selectedby an intelligent mobile based on parameters such as thevendor signal power, channel availability, congestion rate,cost-per-second, and quality-of-service. We propose thatvendors form a vendor area network (VAN) controlled by aninter-vendor mobile registration center (MRC). This paperdiscusses the system’s structure, call procedure, and utilityperformance benefits attained by this system.

Index Terms – dynamic spectrum allocation, user-central,spectrum scarcity, optimum vendor, call procedure, utilityperformance.

Cite: Seyed A. Zekavat and Xiukui Li, "Ultimate Dynamic Spectrum Allocation via User-Central Wireless Systems," Journal of Communications, vol. 1, no. 1, pp. 60-67, 2006.