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    • 3. 发明授权
    • Mobile-assisted network based techniques for improving accuracy of wireless location system
    • 基于移动辅助网络技术,提高无线定位系统的准确性
    • US06463290B1
    • 2002-10-08
    • US09679228
    • 2000-10-03
    • Louis A. StilpJoseph W. SheehanAlan E. E. RogersRobert J. AndersonVineet Sachdev
    • Louis A. StilpJoseph W. SheehanAlan E. E. RogersRobert J. AndersonVineet Sachdev
    • H04Q700
    • H04W64/00G01S1/026G01S5/02G01S5/021G01S5/0273G01S5/06G01S2205/006G01S2205/008H04W4/90H04W76/50
    • The accuracy of the location estimate of a Wireless Location System is dependent, in part, upon both the transmitted power of the wireless transmitter and the length in time of the transmission from the wireless transmitter. In general, higher power transmissions and transmissions of greater transmission length can be located with better accuracy by the Wireless Location System than lower power and shorter transmissions. Wireless communications systems generally limit the transmit power and transmission length of wireless transmitters in order to minimize interference within the communications system and to maximize the potential capacity of the system. Several methods meet the conflicting needs of both systems by enabling the wireless communications system to minimize transmit power and length while enabling improved location accuracy for certain types of calls, such as wireless 9-1-1 (emergency) calls. Such methods include mobile-assisted techniques in which the mobile unit includes functionality to assist in improving location accuracy. The WLS locates the transmitter (mobile unit) while the latter is using a modified transmission sequence comprising a message sent from the wireless transmitter using transmission parameters different from the normal transmission parameters broadcast on the forward control channel by the base stations in the associated wireless communications system. A trigger event, such as the user dialing 9-1-1, causes the mobile unit to operate in the mode in which the modified transmission sequence is used.
    • 无线定位系统的位置估计的精度部分地取决于无线发射机的发射功率和从无线发射机发射的时间长度。 通常,通过无线定位系统可以以比较低的功率和较短的传输更高的精度来定位更高功率的传输和更大传输长度的传输。 无线通信系统通常限制无线发射机的发射功率和传输长度,以便最小化通信系统内的干扰并最大化系统的潜在容量。 通过使无线通信系统能够最小化发射功率和长度,同时实现诸如无线9-1-1(紧急)呼叫的某些类型的呼叫的改进的定位精度,几种方法满足两个系统的冲突的需求。 这些方法包括移动辅助技术,其中移动单元包括有助于提高定位精度的功能。 WLS定位发射机(移动单元),而后者使用修改的传输序列,该修改的传输序列包括使用与相关无线通信中的基站在前向控制信道上广播的正常传输参数不同的传输参数从无线发射机发送的消息 系统。 诸如用户拨号9-1-1之类的触发事件使得移动单元在使用修改的传输序列的模式下操作。