Abstract
A method and apparatus for detecting contention in an RA procedure in a mobile communication system is provided in which an L2/L3 message is received from a UE in uplink resources allocated to the UE by an RA preamble response message that was transmitted for an RA procedure initiated by the UE a CR message associated the RA procedure is transmitted to the UE if the L2/L3 message is an initial access message and predetermined control information is transmitted to the UE on a downlink control channel without transmitting the CR message if the L2/L3 message is not an initial access message.
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Technologies
Resource configuration
Product
Use Cases
Wireless communication
Services
Claim
1. A method for performing a random access procedure in a mobile communication system, the method comprising:
receiving a first message including a random access preamble;
transmitting a second message, which is a random access response message, in response to the first message;
determining whether or not a third message including a Cell-Radio Network Temporary Identifier (C-RNTI) is received from a User Equipment (UE);
transmitting a fourth message, which is a Contention Resolution (CR) message for the random access procedure, to the UE, upon receipt of the third message that does not include the C-RNTI from the UE; and
transmitting UE-specific control information to the UE, upon receipt of the third message including the C-RNTI from the UE,
wherein the UE-specific control information includes a Cyclic Redundancy Check (CRC) specifically mapped to the C-RNTI of the UE, and
wherein the first, second, third, and fourth messages occur in a random access procedure in a mobile communication system.', 'receiving a first message including a random access preamble;', 'transmitting a second message, which is a random access response message, in response to the first message;', 'determining whether or not a third message including a Cell-Radio Network Temporary Identifier (C-RNTI) is received from a User Equipment (UE);', 'transmitting a fourth message, which is a Contention Resolution (CR) message for the random access procedure, to the UE, upon receipt of the third message that does not include the C-RNTI from the UE; and', 'transmitting UE-specific control information to the UE, upon receipt of the third message including the C-RNTI from the UE,', 'wherein the UE-specific control information includes a Cyclic Redundancy Check (CRC) specifically mapped to the C-RNTI of the UE, and', 'wherein the first, second, third, and fourth messages occur in a random access procedure in a mobile communication system.
2. The method of claim 1, wherein the UE-specific control information is addressed by the C-RNTI.
3. The method of claim 1, wherein transmitting the UE-specific control information is performed before expiration of a timer activated for collision detection by the UE in the random access procedure.
4. The method of claim 1, wherein transmitting the UE-specific control information is performed on a downlink control channel.
5. An apparatus for performing a random access procedure in a mobile communication system, the apparatus comprising:
a transceiver for transmitting and receiving messages to and from a User Equipment (UE); and
a controller for controlling the transceiver to transmit a random access response message in response to receiving a message including a random access preamble, determining whether or not a message including a Cell-Radio Network Temporary Identifier (C-RNTI) is received from the UE, and controlling the transceiver to transmit a Contention Resolution (CR) message for the random access procedure to the UE, upon receipt of a message that does not include the C-RNTI from the UE, and to transmit UE-specific control information to the UE, upon receipt of the message including the C-RNTI from the UE,
wherein the UE-specific control information includes a Cyclic Redundancy Check (CRC) specifically mapped to the C-RNTI of the UE, and
wherein each of the messages occurs in a random access procedure in a mobile communication system.', 'a transceiver for transmitting and receiving messages to and from a User Equipment (UE); and', 'a controller for controlling the transceiver to transmit a random access response message in response to receiving a message including a random access preamble, determining whether or not a message including a Cell-Radio Network Temporary Identifier (C-RNTI) is received from the UE, and controlling the transceiver to transmit a Contention Resolution (CR) message for the random access procedure to the UE, upon receipt of a message that does not include the C-RNTI from the UE, and to transmit UE-specific control information to the UE, upon receipt of the message including the C-RNTI from the UE,', 'wherein the UE-specific control information includes a Cyclic Redundancy Check (CRC) specifically mapped to the C-RNTI of the UE, and', 'wherein each of the messages occurs in a random access procedure in a mobile communication system.
6. The apparatus of claim 5, wherein the UE-specific control information is addressed by the C-RNTI.
7. The apparatus of claim 5, wherein the controller controls the transceiver to transmit the UE-specific control information before expiration of a timer activated for collision detection by the UE in the random access procedure.
8. The apparatus of claim 5, wherein transceiver transmits the UE-specific control information on a downlink control channel.
9. A method for performing a random access procedure in a mobile communication system, the method comprising:
receiving a first message, which is a random access response message from a Base Station (BS);
transmitting a second message including a Cell-Radio Network Temporary Identifier (C-RNTI) to the BS, if the C-RNTI exists;
activating a timer for collision detection in the random access procedure, when the message including the C-RNTI is transmitted;
determining that a contention for the random access procedure is resolved successfully, when User Equipment (UE)-specific control information addressable by the C-RNTI is received from the BS before expiration of the time; and
determining that the contention for the random access procedure is not resolved successfully, if the UE-specific control information is not received from the BS before the expiration of the timer,
wherein the UE-specific control information includes a Cyclic Redundancy Check (CRC) specifically mapped to the C-RNTI of the UE,
wherein each of the messages occurs in a random access procedure in a mobile communication system.', 'receiving a first message, which is a random access response message from a Base Station (BS);', 'transmitting a second message including a Cell-Radio Network Temporary Identifier (C-RNTI) to the BS, if the C-RNTI exists;', 'activating a timer for collision detection in the random access procedure, when the message including the C-RNTI is transmitted;', 'determining that a contention for the random access procedure is resolved successfully, when User Equipment (UE)-specific control information addressable by the C-RNTI is received from the BS before expiration of the time; and', 'determining that the contention for the random access procedure is not resolved successfully, if the UE-specific control information is not received from the BS before the expiration of the timer,', 'wherein the UE-specific control information includes a Cyclic Redundancy Check (CRC) specifically mapped to the C-RNTI of the UE,', 'wherein each of the messages occurs in a random access procedure in a mobile communication system
10. The method of claim 9, further comprising;
transmitting a message that does not include the C-RNTI to the BS, if the C-RNTI does not exist;
determining if the contention for the random access procedure is resolved successfully, when a Contention Resolution (CR) message for the random access procedure is received from the BS.', 'transmitting a message that does not include the C-RNTI to the BS, if the C-RNTI does not exist;', 'determining if the contention for the random access procedure is resolved successfully, when a Contention Resolution (CR) message for the random access procedure is received from the BS
11. The method of claim 9, wherein the UE-specific control information is received on a downlink control channel
12. A User Equipment (UE) for a mobile communication system, comprising:
a transceiver for transmitting and receiving messages to and from a Base Station (BS); and
a controller for controlling the transceiver to transmit a message including a Cell-Network Temporary Identifier (C-RNTI) to the BS, if the C-RNTI exists, upon receipt of a random access response message from the BS and activating a timer for collision detection in a random access procedure,
determining that a contention for the random access procedure is resolved successfully, when User Equipment (UE)-specific control information addressable by the C-RNTI is received from the BS before expiration of the time; and
determining that the contention for the random access procedure is not resolved successfully, if the UE-specific control information is not received from the BS before the expiration of the timer,
wherein the UE-specific control information includes a Cyclic Redundancy Check (CRC) specifically mapped to the C-RNTI of the UE,
wherein each of the messages occurs in a random access procedure in a mobile communication system.', 'a transceiver for transmitting and receiving messages to and from a Base Station (BS); and', 'a controller for controlling the transceiver to transmit a message including a Cell-Network Temporary Identifier (C-RNTI) to the BS, if the C-RNTI exists, upon receipt of a random access response message from the BS and activating a timer for collision detection in a random access procedure,', 'determining that a contention for the random access procedure is resolved successfully, when User Equipment (UE)-specific control information addressable by the C-RNTI is received from the BS before expiration of the time; and', 'determining that the contention for the random access procedure is not resolved successfully, if the UE-specific control information is not received from the BS before the expiration of the timer,', 'wherein the UE-specific control information includes a Cyclic Redundancy Check (CRC) specifically mapped to the C-RNTI of the UE,', 'wherein each of the messages occurs in a random access procedure in a mobile communication system.13. The UE of claim 12, wherein the controller controls the transceiver to transmit a message that does not include the C-RNTI to the BS, if the C-RNTI does not exist, and to determine if the contention for the random access procedure is resolved successfully, when a Contention Resolution (CR) message for the random access procedure is received from the BS.14. The UE of claim 12, wherein the UE-specific control information is received on a downlink control channel.']
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