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Downlink transmission power control scheme for mobile communication system using site diversity
| Details |
Inventors: Nakano, Etsuhiro; Nakamura, Takehiro; Ohno, Koji; Sato, Takaaki;
Assignee: NTT Mobile Communications Network Inc. (Tokyo, JP)
Primary Examiner: Eisenzopf; Reinhard J.
Assistant Examiner: Aoki; Makoto
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
A downlink transmission power control scheme for a mobile communication system using the site diversity, which carries out a primary downlink transmission power control using a primary control signal which is transmitted from the mobile station and terminated at each base station, and an additional downlink transmission power control using additional control signals which are transmitted from the base station control station to the base stations. The additional downlink transmission power control may also use a secondary control signal which is transmitted from the mobile station and terminated at the base station control station. The primary downlink transmission power control can be carried out during a non-site diversity period while the additional downlink transmission power control is carried out during the site diversity period, or the primary downlink transmission power control and the additional downlink transmission power control can be both carried out during the site diversity period. |
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DETAILED DESCRIPTION It is therefore an object of the present invention to provide a downlink transmission power control scheme for a mobile communication system using the site diversity, which is capable of improving the transmission power control precision, and reducing an amount of interferences and thereby increasing a capacity in a case of the CDMA mobile communication system.
It is another object of the present invention to provide a downlink transmission power control scheme for a mobile communication system using the site diversity, which is capable of realizing the transmission power control with a small control error and a less amount of signals to be transmitted between stations.
It is another object of the present invention to provide a downlink transmission power control scheme for a mobile communication system using the site diversity, which is capable of realizing a small transmission power control error during a site diversity period even when a transmission power control signal terminated between a mobile station and a base station is used.
According to one aspect of the present invention there is provided a method of downlink transmission power control in a mobile communication system formed by a plurality of base stations, a mobile station to be connected with the base stations via radio channels, and a base station control station for controlling the base-stations, wherein the mobile communication system uses a site diversity in which the mobile station is simultaneously connected with more than one base stations and a diversity combining among said more than one base stations is carried out, the method comprising the steps of: carrying out a primary downlink transmission power control using a primary control signal which is transmitted from the mobile station and terminated at each base station and not to be combined during a site diversity period; and carrying out an additional downlink transmission power control using additional control signals which are transmitted from the base station control station to the base stations
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