Deterministic real-time medium access for cognitive industrial radio networks

Evaluation of cognitive radio for mission-critical and time-critical WSAN in industrial environments under interference

“…The sequence ensures two nodes will come across in the same channel in a limited time, thus guaranteeing a maximum delay. The second one, a deterministic real-time MAC called in this letter DRMAC, depends on a CCC [10]. All nodes access the CCC to send information required by the net to the control node.…”

“…The MACs proposed in [10] use a common control channel (CCC) in order to transmit the information required by the network. It guarantees a deterministic delay in a single hop network.…”

“…The MACs presented in [1,7,10,11] have been tested using a testbed or through simple simulations, but none of them has been evaluated in industrial environments. The main contribution of this letter is the evaluation of the mentioned MACs in critical industrial environments, including fading and interference channels.…”

A Real-Time Medium Access Protocol Supporting Dynamic Spectrum Allocation in Industrial Networks

“…where [ ] 1 1; t BP ∈ (15) A third constraint is introduced by the use of control packets. The length of a control packet will limit the amount of data packets about which control information can be sent to the control node.…”

“…Our main contributions in this paper are 1. a deterministic MAC protocol supporting spectrum-aware cognitive radio and heterogeneous real-time traffic handling for industrial applications (presented earlier in a work-in-progress paper [15]), 2. a real-time analysis framework, including three constraints to be fulfilled, able to guarantee real-time demands of hard real-time traffic, 3. a more exact delay analysis, as part of the real-time analysis framework, that can guarantee more real-time traffic, 4. a new constraint check, also part of the real-time analysis framework, that is introduced due to the limited size of control packets, 5. a performance evaluation of the medium access protocol through simulation, and 6. a comparison of the new analysis method with the one presented previously [15].…”