Cellular radio telecommunication systems
First Claim
1. A cellular telecommunication system comprising a basestation having a radio receiver that is capable of receiving a control channel transmitted by one or more other basestations of the system, from which it derives frequency reference and time base synchronisation data to enable it to correct the frequency and time offset of its own transmissions with respect to those of said other basestations.
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Accused Products
Abstract
A radio telecommunication system, and in particular an in-building system, comprises a number of basestations connected together by a local area network (LAN) at least one of the basestations (BS) is capable of receiving a control channel transmitted by one or more of the other basestations (BS) of the telecommunication systems, from which it derives frequency reference and time base synchronisation data to enable the basestation to correct the frequency and time offset of its own transmissions with respect to the other basestations (BS) in the system. Also connected to the LAN is a controller (PC). The controller receives transmission measurement signals from each of the basestations (BS) and processes these transmission measurement signals to select radio frequency channels on which the basestations of the system should transmit to minimise interference with an external telecommunications system. The controller (PC) also receives transmission measurement signals from the basestations (BS) that are used to determine the power at which the basestations of the telecommunications system should transmit.
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Citations
16 Claims
- 1. A cellular telecommunication system comprising a basestation having a radio receiver that is capable of receiving a control channel transmitted by one or more other basestations of the system, from which it derives frequency reference and time base synchronisation data to enable it to correct the frequency and time offset of its own transmissions with respect to those of said other basestations.
- 3. A cellular radio telecommunication system comprising multiple basestations that are connected by a local area network, to a controller to deliver to the controller transmission measurement signals indicative of radio signals received by each basestation transmitted on a control channel of an external system, the controller serving to process these transmission measurement signals to select radio frequency channels on which the basestations should transmit to minimise interference with the external system.
- 4. A cellular radio telecommunication system comprising multiple basestations that are connected by a local area network to a controller to deliver to the controller transmission measurement signals indicative of radio signals received by each basestation from other of said basestations on a control channel, the controller serving to process these transmission measurement signals in order to determine the power at which the basestations should transmit on said control channel as transmission of the basestations is switched on in a progressive manner.
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16. A cellular telecommunication system including a radio receiver which monitors the frequency of the control channel of the system, an external frequency reference such as a GPS receiver or clock generator, and comparator means to compare the control channel frequency with the external frequency reference and produce an frequency error signal to adjust the frequency of the control channel.
Specification