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Passive Positioning for LTE User Equipment

This paper presents a novel positioning algorithm for LTE user equipment (UE), which utilizes the random access procedure. Unlike the observed time different of arrival (OTDOA) algorithm first proposed in 3GPP technical specification Release 9, the novel algorithm neither needs the positioning reference signals nor multi-eNodeBs, the positioning cost of which is greatly reduced on the premise of high precision. The algorithm can be a beneficial addition to indoor positioning for UE with poor positioning reference signals in indoor environment. Further, it can also be used for user information collection in the region of interest by relevant government departments. Compared with the notorious IMSI-catcher, the characteristic of passive reception makes this algorithm never impact the normal communication behavior.