Patent ID: 6490442
Filing Date: 2002-12-03
Classification: H04W

Abstract:
A system for provisionally estimating the carrier-to-interference ratio of a terminal in a cellular mobile radio network which transmits sets of primary frequencies and sets of secondary frequencies and in which the rate of re-use of the sets of secondary frequencies is higher than that of the sets of primary frequencies and each cell is identified by a primary color (A, B, C, . . . , G) and a secondary color (1, 2, 3) respectively corresponding to the set of primary frequencies and to the set of secondary frequencies which are allocated to it, the system being characterized in that, knowing the level received by said terminal from a local cell (1) to which it is connected and knowing the levels (LB2, LC3, LD2, LE1, LG2, LF1) received by said terminal from adjoining cells (B2, C3, D2, E1, G2, F1) of different primary color to that of said local cell (A1), the system selects a reference cell (B2) from said local cell and said adjoining cells, produces a potential noise including the sum (N1) of said levels (LD2, LG2) received from the cells (D2, G2) of the same secondary color as said reference cell (B2) without taking account of the level (LB2) received from that reference cell (B2), determines a noise level by summing said potential noise (N1) and a noise floor (P) subject to a weighting coefficient and supplies said provisional estimate of the carrier-to-interference ratio of the terminal in said reference cell (B2) by dividing the level received from that reference cell by said noise level.