Channel selecting system for use in a multi-channel mobile communication system
First Claim
1. A channel selecting system for use in a multi-channel mobile communication system comprising receiver means for receiving radio wave signals on a plurality of channels, and field strength measuring means for sequentially measuring the received field strength associated with each channel, said field strength measuring means comprising:
- means for totaling time segments in which the field strength is lower than a predetermined level determined by the selecting system, within a measurement time span for each channel, said totaling means including pulse train generator means for generating pulses which are counted by the totaling means during said time segments in which the field strength is lower than said predetermined level;
means for setting a reference time length which is less than the measurement time span;
comparing means for comparing the length of time of the totaled time segments with said reference time length and generating a signal when said totaled time length is greater than or equal to said reference time length;
switching means coupled to said comparing means for switching said communication system from one of said plurality of channels to another one of said plurality of channels upon the occurrence of at least one of said signal generated by said comparing means, and the elapsing of said measurement time span;
whereby the selecting system selects the channel with the highest relative field strength as measured by the selecting system.
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Abstract
A channel selecting system for use in a multi-channel mobile communication system. The received field strength associated with each channel is measured sequentially to select a channel in the highest field strength. Within a measurement time span for each channel, time segments in which the field strength is lower than a predetermined level is totalized. When the total reaches either a reference time length which is less than the measurement time span or expiration of the measurement time span, one channel measurement is switched to another.
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Citations
5 Claims
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1. A channel selecting system for use in a multi-channel mobile communication system comprising receiver means for receiving radio wave signals on a plurality of channels, and field strength measuring means for sequentially measuring the received field strength associated with each channel, said field strength measuring means comprising:
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means for totaling time segments in which the field strength is lower than a predetermined level determined by the selecting system, within a measurement time span for each channel, said totaling means including pulse train generator means for generating pulses which are counted by the totaling means during said time segments in which the field strength is lower than said predetermined level; means for setting a reference time length which is less than the measurement time span; comparing means for comparing the length of time of the totaled time segments with said reference time length and generating a signal when said totaled time length is greater than or equal to said reference time length; switching means coupled to said comparing means for switching said communication system from one of said plurality of channels to another one of said plurality of channels upon the occurrence of at least one of said signal generated by said comparing means, and the elapsing of said measurement time span; whereby the selecting system selects the channel with the highest relative field strength as measured by the selecting system. - View Dependent Claims (2, 3, 4, 5)
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Specification