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1. 发明授权

US5513246A Radiotelephone locating and handoff using alternative criteria 失效
标题翻译：无线电话定位和切换使用替代标准
公开(公告)号：US5513246A
公开(公告)日：1996-04-30
申请号：US790170
申请日：1991-11-12
申请人： Sven-Olof L. Jonsson , Georg W. R. Chambert , Stig R. Bodin
发明人： Sven-Olof L. Jonsson , Georg W. R. Chambert , Stig R. Bodin
IPC分类号： H04W36/30 , H04M11/00 , H04Q7/00 , H04Q9/00
CPC分类号： H04W36/30 , Y02B60/50
摘要： In a cellular mobile radiotelephone system having a plurality of cells providing radio coverage by a plurality of base stations and having a plurality of mobile stations, the location of a mobile station with respect to cell boundaries is identified using measurements, performed at the mobile station or at selected cells, of transmissions from the cells or transmissions from the mobile station. When a cell is found that meets a specified standard with respect to a call connection in progress according to a first radio-signal criterion, a handoff candidate cell is selected according a second different radio-signal criterion. When no cell is found that meet the specified standard, a cell is selected according to the first radio-signal criterion. Handoff to the selected cell is attempted if that cell is not presently handling that call. More particularly, the first radio-signal criterion may be signal strength and the second radio-signal criterion may be path loss. When a cell is found that meets the signal-strength criterion, the cell is determined to have sufficient signal strength margin so that the path loss criterion may be used instead. As mentioned above, use of the path loss criterion has the advantages of conserving power, reducing interference, and allowing effective cell boundaries to remain fixed. When no cell is found that meets the signal-strength criterion, the call connection is determined to be signal-strength limited such that the signal strength criterion is used to select the cell having the greatest signal strength.
摘要翻译：在具有由多个基站提供无线覆盖并且具有多个移动站的多个小区的蜂窝移动无线电话系统中，使用在移动站执行的测量来识别移动站相对于小区边界的位置，在所选小区处从小区的传输或来自移动站的传输。当根据第一无线电信号标准找到符合正在进行的呼叫连接的指定标准的小区时，根据第二不同的无线电信号标准来选择切换候选小区。当没有发现满足指定标准的小区时，根据第一无线电信号标准选择一个小区。如果该小区目前不处理该呼叫，则尝试切换到所选小区。更具体地，第一无线电信号标准可以是信号强度，并且第二无线电信号标准可以是路径损耗。当发现满足信号强度标准的小区时，确定小区具有足够的信号强度余量，从而可以使用路径损耗标准。如上所述，使用路径损耗准则具有节省功率，减少干扰，并且允许有效小区边界保持固定的优点。当没有发现满足信号强度标准的小区时，呼叫连接被确定为信号强度受限，使得信号强度标准用于选择具有最大信号强度的小区。

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