发明名称 |
Method and system for providing a different frequency handoff in a CDMA cellular telephone system |
摘要 |
A cellular system transfers a call from a source base station to the target base station. A mobile unit measures the strength of pilot signals emanating from surrounding base stations. In response to the result of the measurement, a different frequency hand off operation is initiated by the mobile unit when all pilot signals are lower than a threshold or is initiated by a system controller with consideration being given to the frequency band occupation state of surrounding base stations and the strength information reported from the mobile unit. In a handoff operation, the mobile unit reduces a maximum data rate to modulate user information with a current used frequency and to modulate a different frequency preposition code with a primary frequency so that neighboring base stations may measure the intensity of the preposition code and the system controller can determine how the different frequency hand-off should be operated.
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申请公布号 |
US5649000(A) |
申请公布日期 |
1997.07.15 |
申请号 |
US19940354436 |
申请日期 |
1994.12.12 |
申请人 |
ELECTRONICS & TELECOMMUNICATIONS RESEARCH INSTITUTE |
发明人 |
LEE, DONG-WOOK;KIM, MYOUNG-JIN;CHUNG, YEOUNG-JEE |
分类号 |
H04W36/30;H04W36/36;(IPC1-7):H04Q7/22;H04Q7/24 |
主分类号 |
H04W36/30 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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