| US 7,496,376 B2 | ||
| Outer loop power control method and apparatus for wireless communications systems | ||
| Alfonso Campo Camacho, Madrid (Spain); Miguel Blanco Carmona, Madrid (Spain); Luis Mendo Tomas, Madrid (Spain); José M Hernando Rabanos, Madrid (Spain); and Alvaro Lopez Medrano, Madrid (Spain) | ||
| Assigned to T.O.P. Optimized Technologies, S.L., (Spain) | ||
| Filed on Dec. 01, 2005, as Appl. No. 11/292,715. | ||
| Claims priority of application No. 200502056 (ES), filed on Aug. 17, 2005. | ||
| Prior Publication US 2007/0042718 A1, Feb. 22, 2007 | ||
| Int. Cl. H04B 7/00 (2006.01); H04Q 7/20 (2006.01) | ||
| U.S. Cl. 455—522 [455/127.1; 455/127.5; 455/114.2; 455/63.1; 370/331; 370/332; 370/335; 370/342] | 13 Claims |
| 1. Outer loop power control method for wireless communications systems which based on a data signal (107, 108) received, coming from a base station (102, 103) or from a mobile station (104), comprises the following phases:
establishing a target block error rate (BLERtarget),
calculating an estimate (701) of a desired signal to interference ratio (SIRrec) and of some fading parameters in a channel (706) which characterize the data signal (107, 108) received,
estimating some fading margins (M1, M2, . . . , MN) associated with some outage probabilities (po1, po2, . . . , poN) and with the fading parameters in the channel (706), indicating a status of the data blocks (707) based on the checking of a Cyclic Redundancy Code (CRC), and
establishing a target desired signal to interference ratio (SIRtarget) for the outer loop, based on said status of the data blocks (707), the fading margins (M1, M2, . . . , MN) and the target block error (BLERtarget) of the outer loop, by means of a dynamic adjusting function which performs a mapping between a quality criterion based on
the outage probabilities (po1, po2, . . . , poN) and the quality criterion based on the target block error rate (BLERtarget), so that the power is adapted to the propagation conditions of the data signal (107, 108).
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