Patent
1977-08-30
1979-03-13
Claffy, Kathleen H.
325 55, H04Q 704
Patent
active
041444094
ABSTRACT:
A mobile radio communication system utilizes message channels of the same frequencies in separate geographic zones. Also, zones utilizing the same message channels are assigned distinguishing control codes which are transmitted with control signals to prevent control signals related to one zone from interfering with communications with another zone using the same message frequencies.
REFERENCES:
patent: 3582787 (1971-06-01), Muller et al.
patent: 4025853 (1977-05-01), Addeo
Sakamoto Masayuki
Takayama Yoshikazu
Utano Takanori
Chayt Kenneth A.
Claffy Kathleen H.
Nippon Electric Co. Ltd.
Nippon Telegraph and Telephone Public Corporation
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