Method for a user terminal to random access a carrier aggregation mobile communication system
First Claim
1. A method for performing a random access procedure with a User Equipment (UE) in a mobile communication system supporting carrier aggregation using a primary carrier and a secondary carrier, the method performed by a Base Station (BS) and comprising:
- receiving, from the UE through the primary carrier, a first message comprising a random access preamble;
transmitting, to the UE through the primary carrier, a second message including first uplink (UL) grant information as a response to the random access preamble;
receiving, from the UE through an uplink radio resource corresponding to the first UL grant information, a third message including identity information of the UE; and
transmitting, to the UE, a first Physical Downlink Control Channel (PDCCH) on the primary carrier and a second PDCCH on the secondary carrier, both of the first PDCCH and the second PDCCH being indicated by the identity information of the UE,wherein the first PDCCH transmitted through the primary carrier is considered as a contention resolution message for a contention resolution procedure, the contention resolution message being used for indicating the contention resolution procedure is successful, andwherein the second PDCCH transmitted through the secondary carrier is not considered as the contention resolution message for the contention resolution procedure.
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Abstract
A method for random access to a base station by a user equipment (UE) in a mobile communication system using carrier aggregation in which communication is conducted over a plurality of component carriers, and a terminal for the method are disclosed. When the UE performs a contention-based random access procedure in the mobile communication system to which CA technology is applied, the UE considers an uplink grant signal as a contention resolution message when receiving the uplink grant signal from a eNB only when the uplink grant signal is received through a downlink CC corresponding to an uplink CC used to transmit a random access preamble or a third message, to thereby prevent contention resolution from being erroneously ended.
15 Citations
19 Claims
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1. A method for performing a random access procedure with a User Equipment (UE) in a mobile communication system supporting carrier aggregation using a primary carrier and a secondary carrier, the method performed by a Base Station (BS) and comprising:
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receiving, from the UE through the primary carrier, a first message comprising a random access preamble; transmitting, to the UE through the primary carrier, a second message including first uplink (UL) grant information as a response to the random access preamble; receiving, from the UE through an uplink radio resource corresponding to the first UL grant information, a third message including identity information of the UE; and transmitting, to the UE, a first Physical Downlink Control Channel (PDCCH) on the primary carrier and a second PDCCH on the secondary carrier, both of the first PDCCH and the second PDCCH being indicated by the identity information of the UE, wherein the first PDCCH transmitted through the primary carrier is considered as a contention resolution message for a contention resolution procedure, the contention resolution message being used for indicating the contention resolution procedure is successful, and wherein the second PDCCH transmitted through the secondary carrier is not considered as the contention resolution message for the contention resolution procedure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An evolved NodeB (eNB) which performs a random access procedure with a User Equipment (UE) in a mobile communication system supporting carrier aggregation using a primary carrier and a secondary carrier, the eNB comprising:
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a Medium Access Control (MAC) layer module including a plurality of hybrid automatic repeat request (HARQ) entities respectively corresponding to the primary carrier and the secondary carrier, and configured to control signal transmission and reception using the primary carrier; and a processor functionally connected to the MAC layer module and including a physical layer module configured to receive, from the UE through the primary carrier, a first message comprising a random access preamble, transmit, to the UE through the primary carrier, a second message including first uplink (UL) grant information as a response to the random access preamble, receive, from the UE through an uplink radio resource corresponding to the first UL grant information, a third message including identity information of the UE; and transmit, to the UE, a first Physical Downlink Control Channel (PDCCH) on the primary carrier and a second PDCCH on the secondary carrier, both of the first PDCCH and the second PDCCH being indicated by the identity information of the UE, wherein the first PDCCH transmitted through the primary carrier is considered as a contention resolution message for a contention resolution procedure, the contention resolution message being used for indicating the contention resolution procedure is successful, and wherein the second PDCCH transmitted through the secondary carrier is not considered as the contention resolution message for the contention resolution procedure. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for performing a random access procedure by a User Equipment (UE) in a mobile communication system supporting carrier aggregation using a primary carrier and a secondary carrier, the method comprising:
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transmitting, by the UE, a first message comprising a random access preamble through the primary carrier; receiving, by the UE through the primary carrier, a second message including first uplink (UL) grant information as a response to the random access preamble; transmitting, by the UE, a third message including identity information of the UE through an uplink radio resource corresponding to the first UL grant information; and receiving, by the UE, a first Physical Downlink Control Channel (PDCCH) on the primary carrier and a second PDCCH on the secondary carrier, both of the first PDCCH and the second PDCCH being indicated by the identity information of the UE, wherein the first PDCCH transmitted through the primary carrier is considered as a contention resolution message for a contention resolution procedure, the contention resolution message being used for indicating the contention resolution procedure is successful, and wherein the second PDCCH transmitted through the secondary carrier is not considered as the contention resolution message for the contention resolution procedure.
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Specification