Title:
【発明の名称】通信システムにおいて基地局の同期を行う装置および方法
Document Type and Number:
Japanese Patent JP3474189
Kind Code:
B2
Abstract:
A communication system (105) utilizes the global positioning system (GPS) to maintain a high degree of accuracy of synchronization of base-stations (115-116). When the GPS signal (106, 107, or 108) is absent, the communication system (105) employs an alternate signal (110-113), such as a WWVB, LORAN-C, and MSF signal, to provide redundant synchronization of the base-stations (115-116). To achieve the degree of synchronization accuracy provided by the GPS signal (106-108), the communication system (105) characterizes the alternate signal (110-113) by utilizing the GPS signal (106-108) when the GPS signal (106-108) is present. When the GPS signal (106-108) is absent, the characterized alternate signal is then employed such that synchronization of the base-stations (115-116) is transparent to the base-stations (115, 116). Use of the GPS signal (106-108) to characterize the alternate signal (110-113) also allows the characterized alternate signal to provide the same degree of accuracy as that of the GPS signal (106-108).
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Inventors:
Walsh, William Jay
Application Number:
JP50914294A
Publication Date:
December 08, 2003
Filing Date:
September 22, 1993
Export Citation:
Assignee:
MOTOROLA INCORPORATED
International Classes:
G01S1/00; H04B7/212; H04B7/216; H04W92/00; H04B7/26; H04W56/00; (IPC1-7): H04Q7/36; H04B7/216; H04B7/26
Domestic Patent References:
| JP4134934A | ||||
| JP596642A |
Other References:
【文献】国際公開92/000639(WO,A1)
Attorney, Agent or Firm:
Mamoru Kuwagaki