Method of performing random access procedure in wireless communication system
A method and device for performing contention resolution between a mobile communication terminal and a base station. The method according to an embodiment includes initiating a random access procedure by a medium access control (MAC) layer of the mobile communication terminal, including starting a contention resolution timer; and stopping the contention resolution timer and determining that the random access procedure was successfully completed upon receipt from the base station of a physical downlink control channel (PDCCH) transmission addressed to a cell-radio network temporary identity (C-RNTI) of the mobile communication terminal and containing a UL grant.
1. A method of performing contention resolution associated with a random access procedure between a mobile communication terminal and a base station, comprising:
transmitting, by the mobile communication terminal, a random access preamble;
receiving, by the mobile communication terminal, a random access response;
transmitting, by the mobile communication terminal, an uplink message containing a cell-radio network temporary identity (C-RNTI) of the mobile communication terminal and starting a contention resolution timer once the uplink message is transmitted;
receiving, by the mobile communication terminal, a physical downlink control channel (PDCCH) transmission; and
considering, by the mobile communication terminal, the contention resolution to be successful and stopping the contention resolution timer if the PDCCH transmission is addressed to the C-RNTI and contains an uplink (UL) grant.
2. The method of claim 1 , further comprising:
not stopping the contention resolution timer if the PDCCH transmission is addressed to the C-RNTI and does not contain the UL grant.
3. The method of claim 1 , further comprising:
not considering the contention resolution to be successful if the PDCCH transmission is addressed to the C-RNTI and does not contain the UL grant.
4. The method of claim 1 , wherein the random access procedure is initiated by the mobile communication terminal.
5. The method of claim 1 , wherein the random access procedure is initiated by an UL data arrival.
6. A mobile communication terminal, comprising:
a display;
a transceiver; and
a processor operatively connected to the display and transceiver, the processor configured to perform contention resolution associated with a random access procedure, the processor further configured to
transmit a random access preamble,
receive a random access response,
transmit an uplink message containing a cell-radio network temporary identity (C-RNTI) of the mobile communication terminal and start a contention resolution timer once the uplink message is transmitted,
receive a physical downlink control channel (PDCCH), and
consider the contention resolution to be successful and stop the contention resolution timer if the PDCCH transmission is addressed to the C-RNTI and contains an uplink (UL) grant.
7. The mobile communication telininal of claim 6 , wherein the processor is configured to not stop the contention resolution timer if the PDCCH transmission is addressed to the C-RNTI and does not contain the UL grant.
8. The mobile communication terminal of claim 6 , wherein the processor is configured to not consider the contention resolution to be successful if the PDCCH transmission is addressed to the C-RNTI and does not contain the UL grant.
9. The mobile communication terminal of claim 6 , wherein the random access procedure is initiated by the mobile communication terminal.
10. The mobile communication terminal of claim 6 , wherein the random access procedure is initiated by an UL data arrival.