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US 2003/0119517 A1Published application
Frequency reuse scheme and corresponding frequency hopping sequence
AssigneeAlcatel
InventorChagny Dhainaut
Life of this patent
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AssigneeAlcatel
InventorChagny Dhainaut
Estimating the term…
The invention relates notably to a frequency hopping scheme used by a base station located in a cell of a wireless radio communication network, said cell being divided in N substantially identical sectors S1, S2, . . . , SN looking out from said base station, sector Si being contiguous to sectors Si−1 and S+1 for 2≦i≦N−1 and sector S1 being contiguous to sector SN, N frequencies f1<f2<. . . <fN being available for transmitting signal from said base station to radio terminals located in said cell, the frequency used for transmitting signal in one sector of said cell being different from the N−1 other frequencies used in the subsequent N−1 sectors, said frequency used in one sector changing every time slot according to a frequency hopping scheme, characterised in that According to the invention, at a predefined time slot, the frequency used in said sectors S1, . . . , SN respectively is the following: f1; f3; f5; . . . ; f2n−1; f2; f4; f6−. . . ; f2n; if N=2n or f1; f3; f5; . . . ; f2n−1; f2n+1; f2; f4; f6; . . . ;f2n; if N=2n +1; the frequency used in the sectors at any subsequent time slot being a cyclic permutation of the previous sequence.
1/ Frequency hopping scheme used by a base station located in a cell of a wireless radio communication network, said cell being divided in N substantially identical sectors S1, S2, . . . , SN looking out from said base station, sector Si being contiguous to sectors Si−1 and Si+1 for 2≦i≦N−1 and sector S1 being contiguous to sector SN, N frequencies f1<f2<. . . <fN being available for transmitting signals from said base station to radio terminals located in said cell, the frequency used for transmitting signal in one sector of said cell being different from the N−1 other frequencies used in the subsequent N−1 sectors, said frequency used in one sector changing every time slot according to a frequency hopping scheme, wherein, at a predefined time slot, the frequency used in said sectors S1, . . . , SN respectively are the following:
2/ Frequency hopping scheme according to claim 1, wherein for each successive time slot, the sequence of frequencies is rotated by one sector.
3/ Frequency hopping scheme according to claim 1, wherein said cell is divided in six 60° sectors looking out from said base station, six adjacent frequencies f1<f2<f3<f4<f5<f6 being available for transmitting signals from said base station to radio terminals located in said cell, at a predefined time slot, the frequency sequence used respectively in said sectors S1, . . . , S6, at a predefined time slot, being:
4/ Frequency hopping scheme according to claim 1, wherein each pair of adjacent frequencies are separated by a predefined frequency distance (delta F).
5/ Frequency hopping scheme according to claim 2, wherein said predefined frequency distance (delta F) equals 4 MHz.
6/ Transmitter to be used in a wireless radio communication network, said transmitter being located in a cell divided in N substantially identical sectors S1, S2, . . . , SN looking out from said transmitter, sector Si being contiguous to sectors Si−1 and Si+1 for 2≦i≦N−1 and sector S1 being contiguous to sector SN, N frequencies f1<f2<. . . <fN being available for transmitting signal from said transmitter to radio terminals located in said cell, the frequency used for transmitting signal in one sector of said cell being different from the N−1 other frequencies used in the subsequent N−1 sectors, said frequency used in one sector changing every time slot according to a frequency hopping scheme, wherein said transmitter comprises means for generating signals in the different sectors S1, . . . , SN respectively having said frequency:
7/ Transmitter according to claim 6, further comprising means for superposing at least two layers of frequencies in said cell.
8/ Transmitter according to claim 6, wherein it is a base station of a radio communication network.
9/ Transmitter according to claim 6, used in a fixed wireless communication network.
10/ Wireless communication system comprising a plurality of base stations arranged to form hexagonal cells, said cells being divided in N substantially identical sectors S1, S2, . . . , SN looking out from said base station, sector Si being contiguous to sectors Si−1 and Si+1 for 2≦i≦N−1 and sector S1 being contiguous to sector SN, N frequencies f1<f2<. . . <fN being available for transmitting signal from said base station to radio terminals located in said cell, the frequency used for transmitting signal in one sector of said cell being different from the N−1 other frequencies used in the subsequent N−1 sectors, said frequency used in one sector changing every time slot according to a frequency hopping scheme, wherein one of said base station comprises means for generating signals in the different sectors S1, . . . , SN respectively having said frequency: