A positioning method and device based on TA and PMI

Abstract

The present invention discloses a positioning method and device based on TA and PMI, including receiving and storing the initial access TA value of UE by the base station, and accumulating the stored TA value every time the TA offset is delivered, and according to the accumulated value Calculate the distance between the UE and the base station antenna; save the PMI reported by the UE with RI=1, and judge the validity of the PMI. The valid PMI can be checked in the table to obtain the angle between the UE and the base station antenna; the distance is obtained according to the TA, and the PMI The angle is obtained, and then the UE can be finally positioned according to the geographic location of the base station antenna maintained by the base station itself.

Description

technical field [0001] The invention relates to the technical field of mobile communication positioning, in particular to a positioning technical solution based on TA and PMI. Background technique [0002] There are mainly three base station positioning methods adopted in the current LTE (Long Term Evolution, long-term evolution) system, including CID, E-CID and OTDOA. CID positioning accuracy is low, only based on the physical cell identity (PCI) for positioning, the positioned UE may appear in any position in the serving cell, and the cell radius and cell topology will seriously affect the positioning accuracy of CID; the E-CID positioning method is based on The extension on CID has relatively high accuracy, but the process of E-CID is quite complicated. First, the base station needs to send layer 3 signaling to the UE (user terminal), and then the UE receives the downlink signal sent by the base station according to the layer 3 signaling. And estimate the relative recept...

AI Technical Summary

Problems solved by technology

CID positioning accuracy is low, only based on the physical cell identity (PCI) for positioning, the positioned UE may appear in any position in the serving cell, and the cell radius and cell topology will seriously affect the positioning accuracy of CID; the E-CID positioning method is based on The extension on CID has relatively high accuracy, but the process of E-CID is quite complicated. First, the base station needs to send layer 3 signaling to the UE (user terminal), and then the UE receives the downlink signal sent by the base station according to the layer 3 signaling. And estimate the relative reception time difference of the downlink signal, and then the UE feeds back the estimated time difference to the base station through layer 3 signaling. The complexity of the UE side is high, and the E-CID also requires the base station to estimate the uplink signal reported by the UE. Perform spatial estimation to obtain the positioning angle of the UE, and the complexity of the base station is also relatively high; OTDOA positioning is a multi-cell joint positioning method, which requires multiple cells to send positioning reference signals together, and the subframe for sending positioning reference signals cannot Sending any other information wastes the time-frequency resources of multiple cells. Secondly, OTDOA positioning requires multiple cells around the UE, which may not be possible in remote areas, so OTDOA positioning has certain limitations.

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