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AssigneeNokia Corporation
InventorsJuha P. Kassinen, Jari Parkkinen, Kari Niemela, Heikki Annala, Juan Melero
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The invention concerns a method for synchronising clocks of base transceiver stations in a telecommunications system and a mobile communications system. According to the invention, in either some or in all base station sites of the telecommunications network a location measurement unit is installed, which receives an accurate clock including an extra-system signal. The clock information is transmitted further to base transceiver stations, whose frame transmissions are synchronised in accordance with the clock information. By using the implementation in accordance with the invention both economic and functional advantages are achieved, e.g. the capacity can be increased by up to 50-300%, depending on the manner of implementation.
Method of synchronising base transceiver stations in a mobile communications network, including several mobile stations, and several base station sites including at least one base transceiver station, characterized in that in at least one base station site a location measurement unit is arranged, which:
Method as defined in any preceding claim, characterized in that the clock information transmitted by the location measurement unit to the base transceiver station includes a frame clock, which is defined with the aid of an outside clock, and the base transceiver station's frame number.
Method as defined in any preceding claim, characterized in that the base transceiver station transmits the clock information further to a location calculation unit.
Method as defined in any preceding claim, characterized in that the location measurement unit
Method as defined in any preceding claim, characterized in that the location calculation unit reports the real time difference to a base station controller, which manages and controls the clock phasing of at least such a base transceiver station, to which no location measurement unit is connected, and when required it will transmit the clock tuning value to the base transceiver station.
Method as defined in any preceding claim, characterized in that the location measurement unit receives the signal including the external system accurate clock including from a satellite orbiting the earth.
Method as defined in any preceding claim, characterized in that the location measurement unit is integrated into a base transceiver station.
Mobile communications system including several mobile stations,
Dependencies are inferred from the claim text.