Observing a moving subscriber on the basis of handover commands

Details Observing a moving subscriber on the basis of handover commands Observing a moving subscriber on the basis of handover commands

2005-09-19

2010-11-02

Eng, George (Department: 2617)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S456100, C455S067110

Reexamination Certificate

active

07826857

ABSTRACT:
A location of a subscriber can be observed by means of a mobile network in a completely anonymous way, without a subscriber identifier or a temporary subscriber identifier. At first, a method extracts from a first time slot of a radio channel a message which includes information about a second time slot of a radio channel. The first time slot of a radio channel discloses the current cell of the subscriber and the second time slot of a radio channel discloses a new cell of the subscriber. A location of the subscriber is determined on the basis of the current and the new cell. This location is approximately situated in a geographical intersection area of the current and the new cell. Different kinds of statistics can be deduced from the observations concerning activities of subscribers.

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