Method for providing a minimum coverage for multimedia transmission in presence of switched off cells
View Patent ↗A method, in a cellular communication network comprising cells with at least one switched off cell, for providing a minimum coverage for multimedia transmission, said multimedia being parted into a number of independent autonomous multimedia partitions, comprising the steps of: —transmitting from all neighbor cells ( 3 - 8 ) of said switched off cell ( 1 ), multimedia partition(s) of a primary subset over a normal range, —transmitting from at least a first ( 3 - 8 ) and a second ( 3 - 8 ) neighbor cells of said switched off cell ( 1 ), multimedia partition(s) of a secondary subset over an extended range ( 3 ′- 8 ′), the secondary subset of said first neighbor cell ( 3 - 8 ) being partially disjoint of the secondary subset of said second neighbor cell ( 3 - 8 ) when first and second cells are adjacent.
1. A method, in a cellular communication network comprising cells among which at least one cell is switched off, for providing at least a minimum coverage for multimedia transmission, said multimedia being parted into a number of independent autonomous multimedia partitions, comprising:
transmitting from one or more neighbor cells of said switched off cell, one or more multimedia partitions of a primary subset of the one or more multimedia partitions over a normal range;
transmitting from at least a first and a second neighbor cell of said switched off cell, one or more multimedia partitions of a secondary subset of the one or more multimedia partitions over an extended range, said secondary subset of said first neighbor cell being totally disjoint from said primary subset of said first neighbor cell, the secondary subset of said first neighbor cell being partially disjoint of the secondary subset of said second neighbor cell when said first cell and said second cell are adjacent.
2. The method of claim 1 , wherein one or more cells among the one or more neighbor cells of said switched off cell transmit at least one multimedia partition, over an extended range.
3. The method of claim 1 , wherein the one or more multimedia partitions are transmitted by at least one cell among the neighbor cells of said switched off cell, over an extended range.
4. The method of claim 1 , wherein transmission of at least one multimedia partition over an extended range is protected by adding a protection code.
5. The method of claim 4 , wherein said transmission is protected by forward error correction (FEC).
6. The method of claim 4 , wherein transmission of at least one multimedia partition over an extended range is done with an emitting power generally equal to a normal emitting power used for transmitting over a normal range.
7. The method of claim 1 , wherein transmission of at least one multimedia partition over an extended range is done with an emitting power extended with respect to a normal emitting power used for transmitting over a normal range.
8. The method of claim 1 , wherein union of said primary subset and of said secondary subset of a neighbor cell comprises the one or more multimedia partitions.
9. The method of claim 1 , wherein a number of multimedia partitions are absent from said primary subset and from said secondary subset of a neighbor cell and thus not transmitted from said cell.
10. The method of claim 9 , wherein said number of absent multimedia partitions is determined so that the power budget for said neighbor cell, is lesser or equal than the power budget of said cell if it would transmit the one or more multimedia partitions over a normal range, taking into account any eventual protection budget.
11. The method of claim 10 wherein said number of absent multimedia partition is equal to the ratio of the cardinal of the secondary subset to the coding rate of the protection code.
12. The method of claim 1 , wherein the number of independent autonomous multimedia partitions is equal to half the number of neighbor cells of a switched off cell times the cardinal of the secondary subset.
13. The method of claim 1 , wherein switched off cells are regularly disseminated among the cells.
14. The method of claim 1 , wherein totally disjoint means not comprising any multimedia partition in common.
15. The method of claim 1 , wherein partially disjoint means not totally overlapping, wherein at least one multimedia partition in the primary subset is not in the secondary subset partially disjoint from said primary subset or at least one multimedia partition in the secondary subset is not in the primary subset.