| Publisher | Springer Science+Business Media | ||
|---|---|---|---|
| Format | 576.2KB PDF | Date added | 04 May 2006 |
| Topics | Bandwidth Issues, Broadband, Mobile - Wireless Communications | ||
| Downloads | 8 | ||
The Open Spectrum approach to spectrum access can achieve near-optimal utilization by allowing devices to sense and utilize available spectrum opportunistically. However, a naive distributed spectrum assignment can lead to significant interference between devices. This paper defines a general framework that defines the spectrum access problem for several definitions of overall system utility. By reducing the allocation problem to a variant of the graph coloring problem, it shows that the global optimization problem is NP-hard, and provides a general approximation methodology through vertex labeling. This paper examines both a centralized strategy, where a central server calculates an allocation assignment based on global knowledge, and a distributed approach, where devices collaborate to negotiate local channel assignments towards global optimization.
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