Amateur Radio Techniques by Pat Hawker, D.E. Cole

By Pat Hawker, D.E. Cole

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This means that no e2e goals are defined in the context vector Cv(s) of source device s. Subsequently, only the source Did(s) and the destination Did(d) IDs are included in the communication request message to the deserving SN. , type of service) for the path must also be conveyed. QoS requirements are in such a case enclosed in the context vector Cv(s) of source device s and include the following parameters: minimum required throughput Thmin for the service, the starting tmin and ending tmax times for the time interval when the resources required by source device s must become available (this is different from the DSOP availability time interval tstart and tend), the maximum delay Δr tolerated for the route, the maximum allowed cost Comax for the particular service, and the minimum expected security level Semin [15].

This enables us to study the direct impact PU activity has on SU service completion, which further allows an optimization problem to be formulated and addressed. 6, two clusters denoted as CL-1 and CL-2 are assumed to share a single radio channel that is licensed to PUs and is denoted as c. The activity of PUs in this channel is assumed to be spatially invariant within the geographical area of the two clusters. , being either present or absent in channel c) is observed to be the same at every SU located within the two clusters.

14 ◾ Multimedia over Cognitive Radio Networks Optimized Mean no. 5 CRN cluster-optimized routing performance. 5) toward the VID of the destination without a comprehensive network overview. That means we have in this case limited or no QoS guarantees. In other words, a source only requires the VID of the destination from the SN and routes toward it according to a rectilinear distance geometry along the x and y dimensions. The VIDs of neighbors in the virtual space topology are cross-checked with the VID of the destination, and the neighbor closest to the destination is selected as next hop [7].

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