Patent ID: 8837416

Claim:
A method implemented in a user equipment (UE) used in a wireless communications network configured to support carrier aggregation, the method comprising: receiving, from a base station, downlink control information (DCI) in a physical downlink control channel (PDCCH) on a component carrier (CC), wherein the DCI is configured to have either a first DCI format with a non-zero-bit carrier indicator field (CIF) or a second DCI format with a zero-bit CIF, wherein the non-zero-bit CIF consists of 3 bits, wherein the non-zero-bit CIF includes a carrier indicator index of 0 to 7, and wherein the non-zero-bit CIF includes a carrier indicator index according to a table comprising: Carrier indicator index CC index Carrier indicator CC 0 CC #0 1 CC #1 2 CC #2 3 CC #3 4 CC #4 5 Reserved 6 Reserved 7 Reserved.