Abstract:
A communication system (10, 68) includes a plurality of different, spectrally separated air-interfaces providing different services from co-located base sites (70-76). One of these air-interfaces, which may be CDMA, operates a universal frequency-re-use pattern across multiple cells (80-88, 90), whereas other air-interfaces, such as GSM, have carrier frequencies that a cell re-use pattern. A subscriber unit (12-16) within the system (10-68) monitors an interference environment and path loss of at least some of the various different services to infer propagation conditions that are likely to be experienced within a spread spectrum service supported by the universal frequency re-use pattern. Armed with an assessment of fade (82-86) condition within the system as a whole, implied by time and path loss from broadcast signals from different services, the subscriber unit can regulate and control its power transmission. Spread spectrum communication to a distant base station can be safe in the knowledge that high power transmissions from the subscriber are subject to deep fade when viewed by near-in base sites. Near-far problems associated with high power transmissions to near-in base sites can therefore be mitigated based on a level of confidence that is found in the fade condition determined by path loss in services ancillary to the spread spectrum service.
Abstract:
Método (200) para controlar la potencia de transmisión de un transceptor (70, 100) de un sistema de comunicaciones celulares que comprende una pluralidad de celdas (80, 88, 90) en al menos dos de las celdas que tienen equipos de estaciones base (22-32), y que también comprende un equipo de estaciones base co-ubicadas compatibles con una pluralidad de interfaces aéreas diferentes controlables mediante una unidad transceptora, dicho método que comprende: evaluar un entorno de interferencia que surge de la utilización de al menos una primera interfaz aérea en al menos dos de la pluralidad de celdas; inferir (208) condiciones de propagación que probablemente se experimentarán dentro de una segunda interfaz aérea en base al entorno de interferencia evaluado; y controlar (212) las configuraciones de transmisión de potencia dentro de la segunda interfaz aérea en base a dichas condiciones de propagación inferidas.
Abstract:
A communication system (10, 68) includes a plurality of different, spectrall y separated air-interfaces providing different services from co-located base sites (70-76). One of these air-interfaces, which may be CDMA, operates a universal frequency-re-use pattern across multiple cells (80-88, 90), wherea s other air-interfaces, such as GSM, have carrier frequencies that a cell re-u se pattern. A subscriber unit (12-16) within the system (10-68) monitors an interference environment and path loss of at least some of the various different services to infer propagation conditions that are likely to be experienced within a spread spectrum service supported by the universal frequency re-use pattern. Armed with an assessment of fade (82-86) condition within the system as a whole, implied by time and path loss from broadcast signals from different services, the subscriber unit can regulate and contro l its power transmission. Spread spectrum communication to a distant base station can be safe in the knowledge that high power transmissions from the subscriber are subject to deep fade when viewed by near-in base sites. Near- far problems associated with high power transmissions to near-in base sites can therefore be mitigated based on a level of confidence that is found in t he fade condition determined bypath loss in services ancillary to the spread spectrum service.