| 摘要 |
The invention disclosed is a process to allocate channels in a sectorized cellular network. A system of allocating cellular frequencies (channels) to the sectors among the cells within a tile is disclosed which maximizes channel set usage within the tile while avoiding co-channel interference between cells. According to the present system, no infrastructure rebuild is required. The disclosed approach further supports all currently used cellular technology. By alternating and rotating the channel assignments across sectors, what is a seemingly locally poor algorithm utilizing additional local channels is actually a globally good algorithm which is efficient in terms of the total number of channels used owing to short reuse distance and low number of cell types. Frequencies are assigned in an S+X set, where S equals the number of sectors within a cell and X is the number of additional channels needed to complete an alternation scheme that provides sufficient separation between co-channels. The frequencies are then rotated, i.e., positions within a cell are moved, as well as alternated, i.e., substituted within cells using the S+X set, according to the algorithm set forth herein to minimize co-channel interference. Rotating and alternating channel pairs may then be reversed in their designation and placed to avoid co-channel, and especially front lobe, interference. This allocation process results in the use of a smaller number of frequencies to support the same number of simultaneous users, or conversely, a greater number of simultaneous users within a fixed channel allotment may be had without the use of additional resources. Cells of the same type may occur adjacently with sufficient channel separation to minimize interference, e.g., a tile (cell cluster) may consist of only two cell types, with each cell type utilizing four channels, resulting in a so called 2x(3+1) reuse plan.
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