Abstract:
모바일디바이스들은종종, 네트워크내의모바일디바이스들의포지션정보를계산하기위해 OFDM(orthogonal frequency division multiplexing)을사용한다. 그러나, 포지셔닝을위한모바일디바이스와신호소스사이의물리적거리및 다른환경요인들은수신되는신호들의신호강도에영향을미칠수 있다. 모바일디바이스에서수신되는더 강한신호들은, 특히 2개의신호소스들이동일한심볼을점유할때 더약한신호들이묻히게(drown out) 할수 있다. 종래의 OFDM에서, 신호소스는각각의포지셔닝기회(positioning occasion)에대해동일한심볼을송신하므로, 더약한신호는더 강한신호에비해절대검출되지않을수 있어서, 포지셔닝계산들의정확도가감소된다. 신호소스로부터의더 약한신호가포지셔닝기회들중 적어도일부에서검출될수 있도록, 무선네트워크의각각의신호소스에대해지정된심볼을변경하기위해패턴을사용하기위한시스템들및 방법들이본원에서설명된다.
Abstract:
복수의셀 트랜시버들에대한주파수에러특징들을서버로부터모바일디바이스로전달하여, 모바일디바이스로하여금, 주파수에러특징들에기반하여복수의셀 트랜시버들중 하나또는그 초과로부터의다운링크신호의코히어런트적분의최적또는거의최적의기간을결정할수 있게하는기법들이논의된다. 다운링크신호의코히어런트적분은 LTE(Long Term Evolution)를위한 OTDOA(Observed Time Difference of Arrival) 방법과같은다운링크지상포지셔닝방법을지원하기위한것일수 있으며, 다운링크신호는 PRS(Positioning Reference Signal)일수 있다. 모바일디바이스는넌-코히어런트적분을사용하여코히어런트적분결과들을조합함으로써코히어런트적분을위한최적의기간보다더 긴기간들동안다운링크신호적분을수행할수 있다. 최적의기간은최대또는거의최대의, 신호대 잡음비를달성할수 있다.
Abstract:
Positions of non-reference wireless transceivers to be added to a wireless communication network are determined as follows. Each non-reference wireless transceiver performs measurements of times of arrival (TO A) of signals transmitted by other non-reference wireless transceivers, as well as reference wireless transceivers. Thereafter, time difference of arrival (TDOA) values are computed from at least two types of pairs of measurements as follows: (a) unknown-unknown TDOA values are obtained as differences between TOA measurements of signals transmitted by non- reference wireless transceivers and (b) unknown-known TDOA values are obtained as differences between a TOA measurement of a signal transmitted by a non-reference wireless transceiver and another TOA measurement of another signal transmitted by a reference wireless transceiver. Both types of TDOA values are used to solve simultaneous equations to identify the positions of the non-reference wireless transceivers and optionally times of transmission of the signals by the non-reference wireless transceivers.
Abstract:
Disclosed embodiments pertain to a method of generating a Positioning Reference Signal (PRS) sequence for a system comprising a plurality of physical transmitting antenna elements serving a single cell. In some embodiments, the method may comprise: assigning a distinct Physical Antenna Port (PAP) identifier (ID) to a subset of the plurality of physical transmitting antenna elements; and generating PRS sequences for the subset of the plurality of physical transmitting antenna elements, wherein each PRS sequence corresponds to a physical transmitting antenna element in the subset of the plurality of physical transmitting antenna elements, and each PRS sequence has a corresponding frequency shift based, at least in part, on the PAP ID (h) of the corresponding physical transmitting antenna element.