发明授权
- 专利标题: Method and apparatus for efficient candidate frequency search while initiating a handoff in a code division multiple access communication system
- 专利标题(中): 用于在码分多址通信系统中发起切换的有效候选频率搜索的方法和装置
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申请号: US09312262申请日: 1999-05-14
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公开(公告)号: US06597922B1公开(公告)日: 2003-07-22
- 发明人: Fuyun Ling , Jack Holtzman , Charles E. Wheatley, III , Tao Chen , Edward G. Tiedemann , Gilbert Leung
- 申请人: Fuyun Ling , Jack Holtzman , Charles E. Wheatley, III , Tao Chen , Edward G. Tiedemann , Gilbert Leung
- 主分类号: H04B700
- IPC分类号: H04B700
摘要:
A method and apparatus for efficient candidate frequency search while initiating a handoff in a code division multiple access communication system. The method includes when the pilot signal is transmitted by the mobile station that is power controlled to a target receive level, the traffic channel power level is increased relative to the pilot channel to improve receiver performance. An improved feature is that the received pilot received at the base station stays the same while the receiver receives extra energy in the redundant traffic symbols received to enhance the probability of correctly decoding the received frame. The base station detects the absence of the mobile station transmitted signal from the frequency of interest. If the base station is aware of the starting time and duration of the absence, it can focus its detection during this predetermined time period. The performance can be improved if the absence of the signal is spread across two frames at the frame boundary.
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