Patent ID: 9444590
Filing Date: 2016-09-13
CPC Classification: H04L,H04W

Claim Text:
1. A mobile communication system comprising: a base station; and a user equipment, wherein the base station and the user equipment are configured to communicate on aggregated carriers, the base station is configured to: transmit using a radio resource control signal, to the user equipment, first information which is used to indicate whether a carrier indicator field is present or not in a second downlink control information format for each of the aggregated carriers, transmit using a physical downlink control channel on a first carrier, to the user equipment, second information in the second downlink control information format, the second downlink control information format being transmitted based on a number of bits of the second downlink control information format, the number of bits of the second downlink control information format being given by the first information which is used to indicate whether the carrier indicator field is present or not in the second downlink control information format, transmit using the physical downlink control channel, to the user equipment, third information in a third downlink control information format, the third downlink control information format being used for transmitting random access response information in a random access procedure, transmit, to the user equipment, the random access response information based on the third downlink control information format transmitted using the physical downlink control channel, and transmit, to the user equipment, a physical downlink shared channel on a second carrier based on the second downlink control information format transmitted using the physical downlink control channel on the first carrier, wherein in a case that the carrier indicator field is present in the second downlink control information format, the second downlink control information format in which the carrier indicator field is presented which is transmitted using the physical downlink control channel on the first carrier is used for scheduling of the physical downlink shared channel on the second carrier, and the carrier indicator field is not presented in the third downlink control information format including the third information.