Method and apparatus for mobile radio communications having switched dual frequency synthesizers
First Claim
1. A method in a mobile radio transceiver, comprising the steps of:
- generating a communications transmitter signal having a first fixed frequency during a first time interval of a reception frame and generating a communications reception signal having a second fixed frequency during a second time interval of said reception frame;
generating, separately from said first fixed frequency, a monitoring reception signal for radio signal strength monitoring during a third time interval of said reception frame between said first time interval and said second time interval, the monitoring reception signal having a monitoring frequency different from said first and second fixed frequencies; and
switching between supplying to a receiver section of the transceiver said communications reception signal during said first time interval and said monitoring reception signal during said third time interval in order to monitor a radio signal strength on said monitoring frequency.
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Abstract
In a mobile radio communications station, a communications reception frequency is generated and a time sequence of a plurality of reception monitoring frequencies is separately generated. A reception frequency is switched between the communications reception frequency during a communications reception and a current one of the monitoring reception frequencies during a monitoring reception. More particularly, separate frequency synthesizers are provided for communications reception on the one hand and signal strength monitoring on the other hand. The frequency of the synthesizer for communications reception remains fixed during the course of a communication. The synthesizer for signal strength monitoring need not be as accurate as that for communications reception. Furthermore, since the synthesizer is used only for signal strength monitoring instead of for both communications reception and signal strength monitoring, more time is available for switching between frequencies.
48 Citations
11 Claims
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1. A method in a mobile radio transceiver, comprising the steps of:
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generating a communications transmitter signal having a first fixed frequency during a first time interval of a reception frame and generating a communications reception signal having a second fixed frequency during a second time interval of said reception frame; generating, separately from said first fixed frequency, a monitoring reception signal for radio signal strength monitoring during a third time interval of said reception frame between said first time interval and said second time interval, the monitoring reception signal having a monitoring frequency different from said first and second fixed frequencies; and switching between supplying to a receiver section of the transceiver said communications reception signal during said first time interval and said monitoring reception signal during said third time interval in order to monitor a radio signal strength on said monitoring frequency. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Apparatus for transmitting and receiving communications and measuring signal strength in a mobile radio transceiver, comprising:
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first synthesizer means for generating a communications transmitter signal having a first fixed frequency during a first time interval of a reception frame and for generating a communications reception signal having a second fixed frequency during a second time interval of said reception frame; second synthesizer means, separate from said first synthesizer means, for separately generating a monitoring reception signal for radio signal strength monitoring during a third time interval of said reception frame between said first time interval and said second time interval, the monitoring reception signal having a monitoring frequency different from said first and second fixed frequencies; and means for switching between said first and said second synthesizer means such that said monitoring reception signal is supplied to a receiver section of the transceiver during said third time interval in order to monitor a radio signal strength on said monitoring frequency. - View Dependent Claims (8, 9, 10, 11)
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Specification