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Channel switching control method and a cordless telephone system using the same
| Details |
Inventors: Tanaka, Kiyoshi;
Assignee: Uniden Corporation (Ichikawa, JP)
Primary Examiner: Hsu; Alpus H.
Assistant Examiner:
Attorney, Agent or Firm: Lowe, Price, LeBlanc & Becker
A cordless telephone system including a master phone connected to a telephone line and a slave phone executing communication via one of a plurality of radio channels switchable to said master phone, the master phone and slave phone each having a correlation detector for detecting a correlation value between a received signal and a reference spreading code series, a comparator for comparing the correlation valued detected by the comparator to a prespecified reference correlation value, and a control circuit continuing communication by switching a radio channel when it is determined that the correlation value is lower than the prespecified reference value. |
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DETAILED DESCRIPTION It is an object of the present invention to make it possible to accurately execute channel switching without using any specific ID code as well as to continue communication without causing any trouble during call, even if strong interference occurs.
In a channel switching control method according to the present invention, a correlation value between a received signal and a reference spreading code series is detected, the detected correlation value is compared to a prespecified reference value, and a radio channel is switched according to a result of the comparison.
In a channel switching control method according to the present invention, a correlation value between a received signal and a reference spreading code series is detected, and channel switching is controlled according to a combination of the detected correlation value with at least one of the detected interference wave level, a received signal level, and a signal vs noise ratio.
In a cordless telephone system according the present invention, a correlation value between a received signal and a reference spreading code series is detected between the master phone and the slave phone, and when it is determined from the result of the comparison that the correlation value is lower than the reference value, a radio channel is switched to continue communication.
In a cordless telephone system according to the present invention, a correlation value between a received signal and a reference spreading code series is detected between a master phone and a slave phone, a signal level of the received signal is detected, and detected correlation value is compared to a prespecified reference value, and a radio channel is switched according to a result of the comparison as well as to the detected signal level to continue communication.
In a cordless telephone system according to the present invention, a correlation value between a received signal and a reference spreading code series is detected between a master phone and a slave phone, a level of an interference wave is detected, the detected correlation value is compared to a prespecified reference value, and a radio channel is switched according to a result of the comparison as well as the detected level of the interference wave to continue communication
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Fault Detection 
