| 摘要 |
The invention relates to a fixed wireless access telecommunications system wherein there is provided a multi tier, preferably two tier, frequency plan in which a number of frequency plans, preferably two frequency plans are overlaid. Thus, a first frequency plan can be implemented using first sets of antenna elements and additional overlaid frequency plans can be implemented using additional sets of antenna elements which may be co-located at the base stations with the first sets of antenna elements. The frequency plans may be sectored with the base station comprising at least one directional antenna. The first and second frequency plans are generally the have the same topology except that the first frequency plan is rotated relative to the second. According to one aspect of the system, first and second frequency plans are tri-sectored and the first frequency plan is rotated through an angle such that each sector boundary of the first frequency plan bisects a sector of the second frequency plan such that when the frequency plans are overlaid a hex-sectored frequency plan is generated.
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