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    • 2. 发明申请
    • COVERAGE DETERMINATION AND SWITCHING BETWEEN OVERLAY COMMUNICATION SYSTEMS
    • 覆盖通信系统之间的覆盖确定和切换
    • WO2006028716A1
    • 2006-03-16
    • PCT/US2005/030230
    • 2005-08-25
    • QUALCOMM INCORPORATEDEKVETCHAVIT, ThunyachateGOVINDARAJULA, Ravi
    • EKVETCHAVIT, ThunyachateGOVINDARAJULA, Ravi
    • H04Q7/36H04L12/28
    • H04W36/14H04W36/30H04W88/06
    • For coverage determination and system switching, a terminal obtains pilot strength estimates for base stations in first and second wireless communication systems (e.g., packet data system and voice/data system) and received signal quality estimates for at least one serving base station in the first system. The terminal derives various metrics based on the received signal quality estimates and pilot strength estimates. The terminal may perform handoff to the second system if weak coverage is detected for the first system, a received signal quality metric (Q) for the first system is below a Q th_dn threshold, and a pilot strength metric (V) for the second system exceeds a V th_dn threshold. The terminal may perform handoff to the first system if good coverage is detected for this system, metric Q exceeds a Q th_dn threshold, or a maximum pilot strength metric (M) for the first system exceeds a M th_dn threshold.
    • 对于覆盖确定和系统切换,终端获得第一和第二无线通信系统(例如,分组数据系统和语音/数据系统)中的基站的导频强度估计,以及在第一和第二无线通信系统中的至少一个服务基站的接收信号质量估计 系统。 终端根据接收到的信号质量估计和导频强度估计,得出各种度量。 如果针对第一系统检测到弱覆盖,则终端可以执行到第二系统的切换,第一系统的接收信号质量度量(Q)低于Q第th_dn阈值,并且导频强度度量 (V)超过V th thnn阈值。 如果对该系统检测到良好的覆盖范围,则终端可执行到第一系统的切换,度量Q超过Q阈值,或者第一系统的最大导频强度度量(M)超过M < SUB> th_dn 阈值。