Patent ID: 9736648
Date: 2017-08-15
CPC Classifications: G01S,H04L,H04W

Claim:
1. A method of measuring a location of a user equipment in a wireless access system supporting carrier aggregation, comprising the steps of: receiving information on a PRS (positioning reference signal) transmission bandwidth of a reference cell and information on a PRS transmission bandwidth of a neighboring cell; when a secondary cell of the user equipment is deactivated and a measurement cycle of the secondary cell is same as or greater than 640 ms, determining an operation channel bandwidth of an RF (radio frequency) unit of the user equipment based on the PRS transmission band width of the reference cell, the PRS transmission bandwidth of the neighboring cell, and a channel bandwidth of a serving cell of the user equipment, wherein the channel bandwidth of the serving cell includes a channel bandwidth of a primary cell and the deactivated secondary cell; if the PRS transmission bandwidth of the reference cell and the PRS transmission bandwidth of the neighboring cell belongs to the deactivated secondary cell, reconfiguring the operation channel bandwidth of the RF (radio frequency) unit of the user equipment to a biggest channel bandwidth among the PRS transmission band width of the reference cell, the PRS transmission bandwidth of the neighboring cell, and the channel bandwidth of the serving cell; receiving a PRS from the reference cell and the neighboring cell; and measuring RSTD (reference signal time difference) using the PRS of the reference cell and the PRS of the neighboring cell based on the reconfigured operation channel bandwidth, wherein a parameter for the RSTD is configured according to a smallest bandwidth among the channel bandwidth of the serving cell, the PRS transmission bandwidth of the reference cell and the PRS transmission bandwidth of the neighboring cell, and wherein the parameter for the RSTD includes measurement accuracy of the RSTD and a number of subframes available for measurement of the RSTD.