By Patrik Björklund.
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Extra resources for Applications of resource optimization in wireless networks
In FAP, the BCCH frequencies and TCH frequencies can be planned separately when diﬀerent spectra are used. Hence, the FAP can be considered as two problems, one for the TCH and one for the BCCH. The minimum interference FAP can be stated as follows: Given a list of TRXs and a frequency spectrum, a list of feasible frequencies for each TRX, co-channel and adjacent channel interference matrices and separation requirements for each pair of TRXs. The problem is to assign exactly one frequency to each TRX such that no requirements are violated and the total cumulative interference is minimized.
44 Chapter 6 Solution Methods for Frequency Hopping Networks One way to obtain good solutions is to apply diﬀerent heuristic methods. The meaning of the word heuristic is ﬁnd or discover and comes originally from the Greek word heuriskein. A heuristic does not necessarily solve the problem to optimality, but usually delivers good quality feasible solutions. Local search is used in many heuristic methods. Suppose we have a minimization problem over a set of feasible solutions. Local search considers only a subset of the solution space, because very often it is not practical to consider the entire space.
Frequency hopping is an important feature in a GSM network since the interference can be decreased. This chapter includes also a discussion of the classical frequency assignment problem and a frequency assignment model for frequency hopping GSM networks. 1 Frequency Hopping in GSM Networks One way to increase the performance and the capacity in a GSM network is to adopt slow Frequency Hopping (FH). FH improves the performance when the received signal suﬀers from multipath fading, and FH reduces the required signal to interference ratio [129, 145].
Applications of resource optimization in wireless networks by Patrik Björklund.