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US 6,553,234 B1Granted
Method of frequency reuse in a fixed access wireless network
AssigneeAlcatel Canada Inc.
InventorAdrian Florea
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AssigneeAlcatel Canada Inc.
InventorAdrian Florea
Estimating the term…
Fixed access wireless networks generally includes a grouping of cells, with each cell comprising a base transceiver station in radio frequency contact with a plurality of terminal stations. Such networks are typically assigned a limited number of frequencies to facilitate data transfer. Various techniques are used to maximize the amount of data which can be transferred including polarization, modulation and frequency reuse. A Local Multi-point Distribution System (LMDS) is a form of fixed wireless network, a notable feature of which are the directional nature of their terminal station antennae. The present invention provides a method of assigning frequencies to an LMDS, by exploiting the directivity of the fixed terminal station antennae. Each cell is divided into an even number of at least four sectors. Given a desired carrier to interference ratio, the cells are grouped into clusters, the cluster size defining the interference boundary for a given cell in the cluster. Within each cell sector, interference zones arising from interfering signals from one or more distant base transceiver stations within the cluster are eliminated by controlling the frequency reuse assignments to the interfering base transceiver stations and the interference zones within the sector. A higher frequency reuse factor results and serves to increase the overall traffic capacity in the LMDS.
In a fixed wireless network utilizing an assigned group of frequency channels and comprising i×j cells, wherein each of said cells is divided into an even number of at least four sectors, and wherein each of said cells includes a base station and a plurality of terminal stations, a method of frequency reuse comprising the steps of:
A system for facilitating data transfer comprising:
A computer readable medium having stored thereon, computer-executable instructions which, when executed by a processor, cause the processor to perform the steps of:
Dependencies are inferred from the claim text.