Method of handling time alignment command during a random access procedure
Disclosed is the radio (wireless) communication system providing a radio communication service and the terminal, and more particularly, a method of handling time alignment command during a random access procedure in an Evolved Universal Mobile Telecommunications System (E-UMTS) evolved from the Universal Mobile Telecommunications System (UMTS) or a Long Term Evolution (LTE) system is provided.
1. A user equipment (UE) comprising:
a receiver;
a transmitter; and
a processor;
the receiver and the processor configured to receive a message including a random access preamble index having a first value, wherein the first value indicates that the UE is to select a random access preamble;
the processor, in response to the received message, further configured to select a random access preamble;
the processor and the transmitter configured to transmit the selected random access preamble;
the receiver and the processor further configured to receive a random access response including a timing advance based on the transmitted random access preamble;
the processor further configured to determine whether a timing alignment timer is running;
the processor further configured, on a condition that the timing alignment timer is running, to not apply the timing advance; and
the processor further configured, on a condition that the timing alignment timer is not running, to apply the timing advance,
wherein the receiver and the processor are further configured to receive a second message including a random access preamble index having a second value different than the first value, wherein the second value indicates a preamble that the UE is to transmit.
2. The UE of claim 1 , wherein the processor and the transmitter are further configured to transmit an uplink signal, wherein a timing of transmission of the uplink signal is based on the timing advance on a condition that the timing advance is applied, and is not based on the timing advance on a condition that the timing advance is not applied.
3. The UE of claim 2 , wherein the uplink signal is transmitted using resources indicated in the random access response.
4. The UE of claim 1 , wherein the processor is configured in response to a second random access response including a second timing advance received based on the transmitted preamble of the second value, to apply the second timing advance.
5. The UE of claim 1 , wherein the first value includes 000000.
6. The UE of claim 1 wherein the message is received over a physical downlink control channel (PDCCH).
7. A method comprising:
receiving, by a user equipment (UE), a message including a random access preamble index having a first value, wherein the first value indicates that the UE is to select a random access preamble;
in response to the received message, selecting, by the UE, a random access preamble;
transmitting, by the UE, the selected random access preamble;
receiving, by the UE, a random access response including a timing advance based on the transmitted random access preamble;
determining, by the UE, whether a timing alignment timer is running;
on a condition that the timing alignment timer is running, not applying, by the UE, the timing advance;
on a condition that the timing alignment timer is not running, applying, by the UE, the timing advance; and
receiving a second message including a random access preamble index having a second value different than the first value, wherein the second value indicates a preamble that the UE is to transmit.
8. The method of claim 7 , further comprising:
transmitting, by the UE, an uplink signal, wherein a timing of transmission of the uplink signal is based on the timing advance on a condition that the timing advance is applied and is not based on the timing advance on a condition that the timing advance is not applied.
9. The method of claim 8 , wherein the uplink signal is transmitted using resources indicated in the random access response.
10. The method of claim 7 , further comprising:
in response to a second random access response including a second timing advance received based on the transmitted preamble of the second value, applying, by the UE, the second timing advance.
11. The method of claim 7 , wherein the first value includes 000000.
12. The method of claim 7 , wherein the message is received over a physical downlink control channel (PDCCH).