A component-based approach for constructing flexible link-layer protocols

In this paper, we propose a novel approach for constructing flexible link-layer protocols which separate their functionality into multiple components. Our work is motivated by the fact that link-layer protocols are usually implemented as monolithic blocks. This approach limits the possibility of reusing common functions in multiple protocols and also narrows the flexibility of combining existing blocks for creating new protocols. Through flexibly interchangeable components, the proposed architecture addresses these issues. We discuss the design of the architecture and evaluate a prototype that demonstrates cognitive radio functionality such as autonomous link establishment, high-performance spectrum access and self-organized link maintenance after the unexpected arrival of a primary user.