—Efficient management of the radio spectrum can be accomplished by making use of channel assignment techniques, which work by allocating different channels of the spectrum to the cells of the network in a conflict-free manner (i.e., the cochannel interference is minimized). The problem of dynamically reallocating the channels in response to change in user location patterns, which occurs frequen...

The fixed spectrum frequency assignment problem (FS-FAP) is a highly relevant application in modern wireless systems. This paper presents the first path relinking (PR) approach for solving FS-FAP. We devise four relinking operators to generate intermediate solutions (or paths) and a tabu search procedure for local optimization. We also adopt a diversity-and-quality technique to maintain populat...

The growing demand of wireless applications has put a lot of constraints on the usage of available radio spectrum which is limited and precious resource. However, a fixed spectrum assignment has lead to under utilisation of spectrum as a great portion of licensed spectrum is not effectively utilised. Cognitive radio is a promising technology which provides a novel way to improve utilisation eff...

In today’s scenario the introduction of new wireless applications and services and its increasing demand is creating issues in the allocation of the available radio spectrum which is limited and precious resource. As spectrum utilization depends strongly on time and place, a fixed spectrum assignment leads to under utilization of spectrum. Cognitive radio is a new technology which provides a dy...

DES-Chan is a framework for experimentally driven research on distributed channel assignment algorithms in wireless mesh networks. DES-Chan eases the development process by providing a set of common services required by distributed channel assignment algorithms. A new challenge for channel assignment algorithms are sources of external interferences. With the increasing number of wireless device...

The channel assignment problem has become increasingly important in mobile telephone communication. Since the usable range of the frequency spectrum is limited, the optimal assignment problem of channels has become increasingly important. Two optimization methods, the neu-ral networks and the genetic algorithms are applied for the channel assignment problem. To avoid falling into the local mini...

Abstract In cellular mobile communications the subcarriers are repeatedly used for best utilizing the assigned frequency spectrum. The assignment of channels for users is complex and involves high computation time. Wong et al [15] proposed a heuristic algorithm to achieve the suboptimal solution for sub-carrier assignment. This proposal was based on constructive assignment in real time situatio...

We propose ZAP, an algorithm for the distributed channel assignment in cognitive radio (CR) networks. CRs are capable of identifying underutilized licensed bands of the spectrum, allowing their reuse by secondary users without interfering with primary users. In this context, efficient channel assignment is challenging as ideally it must be simple, incur acceptable communication overhead, provid...

The channel-assignment problem is important in mobile telephone communication. Since the usable range of the frequency spectrum is limited, the optimal channel-assignment problem has become increasingly important. The goal of this problem is to find a channel assignment to requested calls with the minimum number of channels subject to interference constraints between channels. This algorithm co...

* The analysis, opinions, and conclusions expressed in this paper are those of the author and do not necessarily reflect the views of the Federal Communications Commission, its Commissioners, the Wireless Telecommunications Bureau, or any staff. The stated facts come from the author's work and research. This paper serves to provide general information on spectrum assignment, and does not repres...