Patent ID: 9185728
Filing Date: 2015-11-10
Classification: H04L,H04W

Abstract:
1. A method for configuring a component carrier at a base station in a wireless communication system supporting carrier aggregation, the method comprising: configuring a downlink component carrier among a plurality of component carriers as a non-backward compatible component carrier, wherein an initial access for the non-backward compatible component carrier by an evolved user equipment (UE) is permitted and an initial access for the non-backward compatible component carrier by an legacy UE is not permitted; transmitting a synchronization channel and a broadcast channel to at least one UE, via the non-backward compatible downlink component carrier, where the synchronization channel includes a primary synchronization channel and a secondary synchronization channel; receiving an uplink signal from the evolved UE via an uplink component carrier linked to the non-backward compatible component carrier; and receiving an uplink signal from the legacy UE via an uplink component carrier linked to a backward compatible downlink component carrier where the initial access by the legacy UE is permitted, wherein the broadcast channel transmitted via the non-backward compatible component carrier is modified from a broadcast channel transmitted via the backward compatible downlink component carrier, and wherein, for the non-backward compatible downlink component carrier, an orthogonal frequency division multiplexing (OFDM) symbol for the primary synchronization channel is followed by an OFDM symbol for the secondary synchronization channel in a subframe, to restrict the initial access for the non-backward compatible downlink component carrier by the legacy UE.