Abstract. This paper proposes a rendezvous protocol for Cognitive Radio Ad Hoc Networks, RAC 2 E-gQS, which (1) utilizes the asynchronous and randomness properties of the RAC 2 E protocol and (2) grid Quorum System-based channel mapping (gQ-RDV) protocol taking into account channel heterogeneity. We show that the combination of the RAC 2 E protocol with the grid-quorum based channel mapping can yield a powerful RAC 2 E-gQS rendezvous protocol for asynchronous operation in a distributed environment assuring a rapid rendezvous between the cognitive radio nodes.

This paper introduces a novel rendezvous protocol (RAC 2 E) for dynamic control channel provisioning among cognitive radios in a decentralized and cooperative ad-hoc environments. Unlike previous work in the field, RAC 2 E does not require synchronization in the radio environment. Its main characteristics are lightweight design and scalability. The paper elaborates RAC 2 E operation, gives a numerical analysis of its performance behavior under different circumstances and demonstrates its functionalities on a testbed platform realized with four Universal Software Radio Peripheral 2 (USRP2) nodes.

No abstract

Cognitive Radios have emerged as one of the most promising methods to increase wireless system efficiency through dynamic spectrum access combined with cross-layer optimization methods. Most of the research prototypes and demonstrations have so far focused on either general platforms or scenarios that are predominantly taken from military or emergency communications domain. We demonstrate a prototyping framework that is built around realistic home networking scenarios. The demonstration has two purposes. First, it demonstrates how a set of different implemented and integrated components can systematically manipulate transmission parameters to achieve local area optimization. Second, it shows the viability and attractiveness of cognitive radio methods for future commercial home networking devices. The demonstration showcases dynamic spectrum allocation and policy based behavioral changes in a home environment, where several multimedia streams and data communication connections are competing against each other.

This paper proposes a rendezvous protocol for cognitive radio ad hoc networks, RAC 2 E-gQS, which utilizes (1) the asynchronous and randomness properties of the RAC 2 E protocol, and (2) channel mapping protocol, based on a grid Quorum System (gQS), and taking into account channel heterogeneity and asymmetric channel views. We show that the combination of the RAC 2 E protocol with the grid-quorum based channel mapping can yield a powerful RAC 2 E-gQS rendezvous protocol for asynchronous operation in a distributed environment assuring a rapid rendezvous between the cognitive radio nodes having available both symmetric and asymmetric channel views. We also propose an enhancement of the protocol, which uses a torus QS for a slot allocation, dealing with the worst case scenario, a large number of channels with opposite ranking lists.