13-09-2017, 04:11 PM
Dynamic spectrum access systems offer spectrum that is temporarily available to opportunistic users capable of broadcasting across multiple noncontiguous subchannels. Such methods can be highly beneficial in terms of spectrum utilization, but excessive fragmentation degrades performance and therefore reduces benefits. Depending on the model, a system operates at a capacity that satisfies requests for bandwidth by assigning a collection of one or more unused bandwidth interrupts to each request as bandwidth is available. Within the class of dynamic fragmentation models, including dynamic storage allocation models that have existed for many decades, this result appears to be the first of its kind.