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Embodiments of the present invention relate to a database update method and apparatus for locating a pCell. An embodiment of the present invention provides a database update apparatus for locating a pCell, comprising: a database storing grid cells that are sorted by pCell ID; a DB collection unit collecting log data for a WLAN signal from a mobile communication terminal which performs communication using the WLAN signal; an information extraction unit extracting a WLAN parameter from the log data of the WLAN signal; and a DB update unit updating the grid cells by matching and storing the information based on the extracted WLAN parameter in the corresponding grid cell. According to one embodiment of the present invention, the data-based information for AP locations and its application to the determination of a location can enhance the location performance.
pcells and scells are notions that are used in case of carrier aggregation. the pcell and scell carrier components play different roles:
** pcell is used to manage the RRC connection (RRC signalling) and also to vehiculate data in DL and UL direction
** scells are used to vehiculate data (in DL direction only in case of DL carrier aggregation for example). As no RRC signalling is vehiculated over scells
