Transmission controller for transmitters in base station for mobile telecommunication system

A simulcasting transmitter control apparatus for use in a base station of a mobile telecommunication system, said base station being provided with a plurality of transmitters each having its own delay characteristic and with a base station control unit providing a plurality of control data, said simulcasting transmitter control apparatus comprising:

• a unit for inputting said control data, said control data being usable in simulcasting of a multiplicity of radio frequency signals of the same channel in a reiteration cell area in which outputs of said transmitters are overlapped to each other in a certain area;
• a unit for generating a reference clock;
• a unit for generating first and second delayed clocks divided from said reference clock;
• a first delay unit for receiving said control data from said base station control unit, setting a first delay time period in accordance with a given one of said control data, and delaying outputting of paging data from said transmitters of the base station by said first delay time period in synchronization with said first delayed clock;
• and
• a second delay unit operable in association with said first delay unit, for receiving said control data from said base station control unit, setting a second delay time period in accordance with another given one of said control data, and delaying outputting of the paging data from said transmitters by said second delay time period in synchronization with said second delayed clock, whereby the simulcasting of said multiplicity of paging data signals of the same channel in the reiteration cell area is carried out in said plurality of transmitters.

A method for controlling simulcasting of paging information over a same channel from each of a plurality of transmitters, each having its own delay characteristic, associated with a common base station of a mobile telecommunication system, said method comprising the steps of:

• comparing a first channel of paging data from an encoder of said base station to a second channel of paging data from said transmitter to measure a delay characteristic of said transmitter;
• generating control data for controlling said transmitter, said control data including time delay control data, generated in response to said delay characteristic of said transmitter, for controlling a time delay of said transmitter;
• generating a reference clock signal;
• dividing said reference clock signal to generate a first clock signal and a second clock signal, said first and second clock signals each being different from each other and less than a frequency of said reference clock signal;
• dividing said first clock signal to generate a first delayed clock signal having a frequency less than said first clock signal;
• dividing said second clock signal to generate a second delayed clock signal having a frequency less than said second clock signal;
• storing paging data from said base station into a first variable length shift register in response to said second delayed clock and delaying the output of said paging data from said first variable shift register in response to said time delay control data;
• and
• storing delayed paging data output from said first variable shift register into a second variable length shift register in response to said second delayed clock and delaying the output of said paging data from said second variable shift register in response to said time delay control data and said first delayed clock, the output of said paging data from said second variable shift register being provided to said transmitter.