Patent ID: 8842637

Claim:
A method comprising: a) transmitting, by a base station, at least one control message to a wireless device, said at least one control message comprising: i) an identifier for each carrier in a plurality of carriers, said plurality of carriers comprising: (1) at least one backward compatible carrier; and (2) at least one non-backward compatible carrier, a first common reference signal overhead of each of said at least one non-backward compatible carrier being substantially lower than a second common reference signal overhead of each of said at least one backward compatible carrier; ii) information identifying a carrier type for each of said plurality of carriers, said carrier type being one of at least a backward compatible type and non-backward compatible type; and iii) information associating each of said at least one non-backward compatible carrier with one of said at least one backward compatible carrier; b) receiving, by said base station, channel state information of one of said at least one non-backward compatible carrier from said wireless device on an uplink carrier of one of said at least one backward compatible carrier; c) transmitting, by said base station, a plurality of second control messages to said wireless device on a backward compatible carrier, said plurality of second control messages comprising scheduling information for transmission of packets on the non-backward compatible carrier associated with said backward compatible carrier; and d) transmitting, by said base station, a plurality of packets to said wireless device on said non-backward compatible carrier according to said scheduling information.