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US6490442: Pro-active estimation of interference signal ratio in a radiocommunication cellular network

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Filing Information

Inventor(s) Thierry Billon ·
Assignee(s) None listed in document.
Attorney/Agent(s) Lee, Mann, Smith, McWilliams, Sweeney & Ohlson ·
Primary Examiner Thanh Cong Le ·
Assistant Examiner Lana Le ·
Application Number US9486922
Filing date 07/13/2000
PCT 371 date 07/13/2000
Issue date 12/03/2002
Predicted expiration date 07/13/2020
U.S. Classifications 455/226.1  · 455/63  · 455/446  · 455/671  ·
International Classifications --
Kind CodeB1
International Classifications 4552261 · 4552262 · 455 671 · 4552263 · 455446 · 455447 · 455450 · 455449 · 455 63 ·
PCT Application Number WO20PCTFR9801951 - 09/11/1998
PCT Publication Number WO199914968 - 03/25/1999
Foreign Priority FR9711467 - 09/12/1997 ·
9 Claims, 2 Drawings


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. The system knows the level received by said terminal from a local cell (A1) to which it is connected. It also knows the levels (LB2, LC3, LD2, LE1, LG2, LF1) received by said terminal from adjoining cells (B2, C3, D2, E1, G2, F1). It selects a reference cell (B2) from said local cell and said adjoining cells, produces a potential noise by calculating the sum (N1) of the levels (LD2, LG2) received from the cells (D2, G2) using the same secondary frequencies as said reference cell (B2), and supplies said estimate in the reference cell (B2) by dividing the level received from said reference cell by the potential noise.

Independent Claims | See all claims (9)

  1. 1. 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.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US5241603* Sony Corporation Akagiri et al. Aug 1993
US5711007* Motorola, Inc. Lin et al. Jan 1998
US5734983* Northern Telecom Limited Faruque Mar 1998
US5995840* Motorola, Inc. Dorenbosch et al. Nov 1999
US6178328* Nortel Networks Corporation Tang et al. Jan 2001
* cited by examiner