Patent ID: 9049643
Filing Date: 2015-06-02
Classification: H04W

Abstract:
1. A method for transmitting and receiving data to and from a primary base station supporting a primary radio access technology (RAT) and a secondary base station supporting a secondary RAT by a mobile station (MS) in a radio access system supporting a multi-RAT, the method comprising: executing an initial network entry procedure with the primary base station; performing a multi-RAT capability negotiation procedure with the primary base station, the multi-RAT capability negotiation procedure including exchanging information required for an additional access to the secondary base station; receiving, from the primary base station, a multi-RAT scan command message that commands the MS to perform a scanning procedure on at least one secondary base station within coverage of the primary base station, the multi-RAT scan command message including SSIDs (subsystem identifications) of secondary base stations in vicinity of the MS, a beacon transmission period, and a scanning interval; performing the scanning procedure on the at least one secondary base station based on the information exchanged with the primary base station through the multi-RAT capability negotiation procedure; if an acknowledgement message allowing the MS to additionally access a selected secondary base station is received from the primary base station, performing an additional access procedure with the selected secondary base station to simultaneously connect to both of the primary base station and the selected secondary base station, wherein the acknowledgement message is received with a SSID of the selected secondary base station, a MAC (medium access control) address of the selected secondary base station, a WEP (wired equivalent privacy) key, a channel number, a protocol version of the selected secondary base station and an offset between a beacon and a frame of the selected secondary base station, wherein the selected secondary base station is selected by the primary base station based on: simultaneously transmitting and receiving data to and from the primary base station and the selected secondary base station.