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17.1 CELLULAR SYSTEMS WITH OVERLAPPING COVERAGE The concept of cellular communication systems is based on the assumption that a mobile user is served by the base station that provides the best link quality [1, 2]. Spectrum allocation strategies, discussed in 12, are based on this assumption. In many cases, however, a mobile user can establish a communication link of acceptable quality with more than one base. Therefore, at many locations there is overlapping coverage, usually by nearby base stations [3]. The coverage overlap can be used to improve the system performance. Several schemes that consider this have been suggested [4 8]. Generalized xed channel assignment (GFCA), a scheme that allows a call to be served by any of several nearby base stations, was considered in Choudhury and Rappaport [4]. Directed retry, discussed in References [5, 6], allows a new call that cannot be served at one base to attempt access via a nearby alternative base. Load sharing is an enhancement of directed retry that allows calls in congested cells to be served by neighboring base stations. In Chu and Rappaport [7] overlapping coverage for highway microcells was considered. The use of overlapping coverage with channel rearrangement was discussed in Chu and Rappaport [8]. Reuse partitioning [9 11] can also improve traf c performance of xed channel assignment (FCA). The method divides the channels into several disjoint partitions. These partitions are associated with different cluster sizes (or reuse factors). Channels are allocated to base stations according to these cluster sizes. To meet the same signal quality requirement, channels corresponding to smaller cluster sizes are used within a smaller area than that for channels associated with larger cluster sizes [9]. Since channels are reused more often for a smaller cluster size, there may be more channels available at a base in reuse partitioning than in FCA. Therefore, improved traf c performance can be obtained. Because there is a xed relationship between channels and base stations, reuse partitioning is a xed channel assignment scheme. In this section the acronym FCA is used only to refer
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Advanced Wireless Networks: 4G Technologies C 2006 John Wiley & Sons, Ltd. Savo G. Glisic
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xed channel assignment without utilizing overlapping coverage or reuse partitioning. That is, in FCA all channels are allocated using a single cluster size and overlapping coverage is not exploited. When overlapping coverage exists in a system and is being used to provide enhanced access, users in overlapping areas may bene t. However, this may be at the expense of users in nonoverlapping areas who may encounter increased blocking or handoff failure because of the higher channel occupancy of the system. Generally, overlapping areas tend to occur at the periphery of cells (i.e. distant from bases). In reuse partitioning, on the other hand, calls that are close to base stations can access channels from both the smaller cluster and larger cluster partitions. Those calls distant from bases cannot use channels from partitions of smaller cluster sizes. Such calls may in fact do more poorly than in FCA. When both overlapping coverage and reuse partitioning are used, they can complement one another. Such a combination will be discussed in this section. The system layout is shown in Figure 17.1. The cell radius, r , is de ned as the distance from a base to a vertex of its own cell. The coverage of a base is the area in which users can establish a link with acceptable signal quality with that base. This area can be modeled by a circle with the center at the corresponding base station. The coverage radius, R, is de ned as the distance from a base to its coverage boundary. The coverage of a base is overlapped with coverages of neighboring bases. Therefore, calls can potentially access one, two, three or even more base stations depending on the platform location and the ratio of the coverage radius to the cell radius (R/r ). For the
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