The invention discloses a downlink component carrier wave identification method, including the followings: the
system information of each downlink component carrier wave in a set of downlink component carrier
waves at least includes frequency point information bearing the downlink component carrier wave of
random access response, or includes frequency point bearing the downlink component carrier wave of
random access response and bandwidth information thereof; or at least includes identification information bearing the downlink component carrier wave of
random access response, and the identification information and frequency point information of each downlink component carrier wave, or the identification information, frequency point and bandwidth information of each downlink component carrier wave. Or, the corresponding relation between each downlink component carrier wave of a set of downlink component carrier
waves and random access leader sequence is set, and the
system informationof each downlink component carrier wave in a set of downlink component carrier wave at least includes self-identification information and the number information of downlink component carrier wave in a set of downlink component carrier
waves. Simultaneously, the invention also discloses a reporting method and a device of synchronous downlink component carrier wave. The invention is simply realizedand is practical.