发明授权
US06594243B1 Methods and apparatus for enhanced soft handoff in a CDMA wireless communication system
失效
CDMA无线通信系统中增强软切换的方法和装置
- 专利标题: Methods and apparatus for enhanced soft handoff in a CDMA wireless communication system
- 专利标题(中): CDMA无线通信系统中增强软切换的方法和装置
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申请号: US09354220申请日: 1999-07-15
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公开(公告)号: US06594243B1公开(公告)日: 2003-07-15
- 发明人: Ching Yao Huang , Joe Huang , I-Fong Antonio Wu , Xiao Cheng Wu , Bee Yun Yu
- 申请人: Ching Yao Huang , Joe Huang , I-Fong Antonio Wu , Xiao Cheng Wu , Bee Yun Yu
- 主分类号: H04Q700
- IPC分类号: H04Q700
摘要:
Soft handoffs in an IS-95 CDMA system or other wireless communication system are controlled using an enhanced set of soft handoff parameters which allow the system to adapt more readily to changing radio frequency (RF) conditions. In an illustrative embodiment, values for particular ones of the soft handoff parameters are selected in accordance with a set of rules, including rules such as, e.g., select the minimum value of add threshold among the members of an active set of pilots for a given mobile station; select the maximum value of drop threshold among the members of the active set; select the minimum value of drop threshold timer among the members of the active set; and select the minimum value of comparison threshold among the members of the active set. A quality measure is then determined for each of the members of the active set, based on one or more of the selected soft handoff parameter values and values of one or more additional parameters, e.g., add intercept, drop intercept and slope parameters, associated with those members. Particular values of the additional parameters are then selected based on the quality measures. The selected parameter values are then utilized in a soft handoff process, e.g., in a soft handoff process in which the given mobile station is directed to handoff from a primary base station to another base station of the system.