Process to allocate channels in a sectorized and tiered cellular network

A method for allocation of channels to base stations within the cells of a tile for reuse within a tiered cellular communications system comprising:

• a) indexing the base stations (BS) within a cellular communications system according to rows and columns;
• b) determining a co-channel interference requirement within the cellular communications system;
• c) determining the number (N) of cell types required within the cellular communications system based on a co-channel interference requirement;
• d) placing only one cell type in each row;
• e) allocating channels to each cell according to:
• i) allocate a distinct group of S+X channels for each cell type, where S is the number of sectors in an outer tier of a cell, and X is the number of channels needed to complete an alternation scheme providing sufficient separation between co-channels,
• ii) divide the S+X number of channels into rotating groups and alternating groups,
• iii) designate which sector types of the outer tier of a cell receive members of the rotating group,
• iv) designate which sector types of the outer tier of a cell receive members of the alternating group,
• v) for a first row, first column cell:
• allocate members of the rotating group into the designated rotating group sectors of the first row, first column cell,
• allocate at least one of the alternating group into the designated alternating group sector or sectors,
• vi) allocate S of the channels from the cell type distinct group to an outer tier of a cell, subject to:
• A) if any of the allocated group of S channels can be rotated to avoid front lobe interference with its nearest co-channel cell, rotate those channels, and
• B) if A) cannot be accomplished, alternate a group of channels selected from S+X, and
• vii) allocate an unused remaining member of the alternating group from S+X to an inner tier of the cell.

A method for allocation of channels to base stations within the cells of a tile for reuse within a cellular communications system comprising:

• a) indexing the base stations (BS) within a cellular communications system according to a row (i) and a column (j);
• b) determining a co-channel interference requirement within the cellular communications system;
• c) determining the number (N) of cell types required within the cellular communications system;
• d) allocating ordinals to each of the number of cell types and setting CurrentCellType to the cell type first in sequence;
• e) labeling the cells by cell type according to:
• i) if N is even:
• ii) step 1:
• label cells label cells BSi,j, BSi,j+2, BSi+N,j, and BSi+N,j+2 as CurrentCellType,
• iii) step 2:
• increase i by 1,
• change CurrentCellType to the cell type next in sequence,
• if the ordinal of CurrentCellType is even set j=j+1, if ordinal is odd set j=j−1,
• iv) Step 3:
• repeat from e) ii) step 1 for all cell types of the tile;
• v) if N is odd:
• vi) step 1:
• label cells BSi,j, BSi,j+2 as CurrentCellType,
• if the ordinal of CurrentCellType is odd, label BSi+N,j+1, and BSi+N,j+3 with CurrentCellType
• if the ordinal of CurrentCellType is even, label BSi+N,j−1 and BSi+N,j+1 with CurrentCellType,
• vii) step 2:
• increase i by 1,
• change CurrentCellType to the cell type next in sequence,
• if the ordinal of CurrentCellType is even set j=j+1, if ordinal is odd set j=j−1,
• viii) Step 3:
• repeat from e) vi) step 1 for all cell types of the tile;
• and
• f) allocating channels to each cell according to:
• allocate a distinct group of S+X channels for each cell type, where S is the number of sectors in an outer tier of a cell, and X is the number of channels needed to complete an alternation scheme providing sufficient separation between co-channels,
• then for each cell:
• allocate S of the channels from the cell type distinct group to an outer tier of a cell, subject to:
• i) if any of the allocated group of S channels can be rotated to avoid front lobe interference with its nearest co-channel cell, rotate those channels,
• ii) if i) cannot be accomplished, alternate a group of channels selected from S+X, and
• iii) allocate an unused remaining member of the alternating group from S+X to an inner tier of the cell.

A method for allocation of channels to base stations within the cells of a tile for reuse within a cellular communications system comprising:

• a) indexing the base stations (BS) within a cellular communications system according to a row (i) and a column (j);
• b) determining a co-channel interference requirement within the cellular system;
• c) determining the number (N) of cell types required within the cellular communications system;
• d) sequentially identifying the cell types and setting CurrentCellType to the cell type first in sequence;
• e) labeling the cells by cell type according to:
• i) if N is even:
• ii) step 1:
• label cells BSi,j, BSi,j+2, BSi+N,j, and BSi+N,j+2 as CurrentCellType,
• iii) step 2:
• increase i by 1,
• change CurrentCellType to the cell type having the ordinal next in sequence,
• if the ordinal of CurrentCellType is even set j=j+1, if ordinal is odd set j=j−1,
• iv) Step 3:
• repeat from e) ii) step 1 for all cell types of the tile;
• v) if N is odd:
• vi) step 1:
• label cells BSi,j, BSi,j+2 as CurrentCellType,
• if the ordinal of CurrentCellType is odd, label BSi+N,j+1 and BSi+N,j+3 with CurrentCellType
• if the ordinal of CurrentCellType is even, label BSi+N,j−1 and BSi+N,j+1 with CurrentCellType,
• vii) step 2:
• increase i by 1,
• change CurrentCellType to the cell type having the ordinal next in sequence,
• if the ordinal of CurrentCellType is even set j=j+1, if ordinal is odd set j=j−1,
• viii) Step 3:
• repeat from e) vi) step 1 for all cell types of the tile;
• and
• f) allocating channels to each cell according to:
• allocate a distinct group of S+X channels for each cell type, where S is the number of sectors in an outer tier of a cell, and X is the number of channels needed to complete an alternation scheme meeting the co-channel interference requirement,
• then for each cell:
• designate sectors a, b, and c to an outer tier of a cell,
• allocate S of the channels from the cell type distinct group to an outer tier of a cell, subject to:
• select a rotating group of channels from S+X,
• select an alternating group of channels from S+X,
• rotate members of the rotating group sectors a and b when a cell is in another column in the same row,
• alternate members of the alternating group in sector c when a cell is in another column in the same row,
• when changing to a new row make the rotating group of the previous row the alternating group for the new row and make the alternating group of the previous row the rotating group for the new row,
• placing the new row alternating channel to minimize co-channel front lobe interference, and
• allocating any unused members of the alternating group of channels of a cell to any tiers of that cell which have not had a channel allocated thereto.