Method and apparatus supporting random access transmissions
A method and a wireless transmit/receive unit (WTRU) are disclosed. The WTRU comprises a transceiver and a processor. The WTRU receives a system information block (SIB) from a base station, wherein the SIB indicates random access transmission uplink resources. After receiving the SIB, the WTRU transmits a random access preamble to the base station. After transmitting the random access preamble, the WTRU transmits, using one or more of the uplink resources indicated by the SIB, a first message to the base station, wherein the first message includes a first radio network temporary identifier (RNTI) of the WTRU. After transmitting the first message, the WTRU receives a second message from the base station, wherein the second message is derived from a second RNTI, the second RNTI being different than the first RNTI. After receiving the second message, the WTRU transmits to the base station.
1. A method performed by a wireless transmit/receive unit (WTRU), the method comprising:
receiving a system information block (SIB) from a base station, wherein the SIB indicates random access transmission uplink resources;
after receiving the SIB, transmitting a random access preamble to the base station;
after transmitting the random access preamble, transmitting, using one or more of the uplink resources indicated by the SIB, a first message to the base station, wherein the first message includes a first radio network temporary identifier (RNTI) of the WTRU;
after transmitting the first message, receiving a second message from the base station, wherein the second message is derived from a second RNTI, the second RNTI being different than the first RNTI; and
after receiving the second message, transmitting to the base station.
2. The method of claim 1 , wherein the first message is transmitted using a HARQ process.
3. The method of claim 1 , further comprising calculating a third RNTI for random access transmissions with the base station.
4. The method of claim 3 , wherein the third RNTI is the same as the first RNTI or the second RNTI.
5. A wireless transmit/receive unit (WTRU) comprising:
a transceiver; and
a processor,
wherein the transceiver and the processor are configured to cause the WTRU to:
receive a system information block (SIB) from a base station, wherein the SIB indicates random access transmission uplink resources;
after receiving the SIB, transmit a random access preamble to the base station;
after transmitting the random access preamble, transmit, using one or more of the uplink resources indicated by the SIB, a first message to the base station, wherein the first message includes a first radio network temporary identifier (RNTI) of the WTRU;
after transmitting the first message, receive a second message from the base station, wherein the second message is derived from a second RNTI, the second RNTI being different than the first RNTI; and
after receiving the second message, transmit to the base station.
6. The WTRU of claim 5 , wherein the first message is transmitted using a HARQ process.
7. The WTRU of claim 5 , wherein the transceiver and the processor are further configured to calculate a third RNTI for random access transmissions with the base station.
8. The WTRU of claim 5 , wherein the third RNTI is the same as the first RNTI or the second RNTI.
9. A method performed by a wireless transmit/receive unit (WTRU), the method comprising:
receiving control information from a first cell, wherein the control information indicates uplink resources for use with random access transmission;
after receiving the control information, transmitting a random access preamble to a second cell;
after transmitting the random access preamble, transmitting, using one or more of the uplink resources indicated by the control information, a first message to the second cell, wherein the first message includes a first radio network temporary identifier (RNTI) of the WTRU;
after transmitting the first message, receiving a second message from the second cell, wherein the second message is derived from a second RNTI, the second RNTI being different than the first RNTI; and
after receiving the second message, transmitting to the second cell,
wherein the first cell and the second cell are associated with a same base station.
10. The method of claim 9 , wherein the first message is transmitted using a HARQ process.
11. The method of claim 9 , further comprising calculating a third RNTI for random access transmissions with the second cell.
12. The method of claim 9 , wherein the third RNTI is the same as the first RNTI or the second RNTI.
13. A wireless transmit/receive unit (WTRU) comprising:
a transceiver; and
a processor,
wherein the transceiver and the processor are configured to cause the WTRU to:
receive control information from a first cell, wherein the control information indicates uplink resources for use with random access transmission;
after receiving the control information, transmit a random access preamble to a second cell;
after transmitting the random access preamble, transmit, using one or more of the uplink resources indicated by the control information, a first message to the second cell, wherein the first message includes a first radio network temporary identifier (RNTI) of the WTRU;
after transmitting the first message, receive a second message from the second cell, wherein the second message is derived from a second RNTI, the second RNTI being different than the first RNTI; and
after receiving the second message, transmit to the second cell,
wherein the first cell and the second cell are associated with a same base station.
14. The WTRU of claim 13 , wherein the first message is transmitted using a HARQ process.
15. The WTRU of claim 13 , further comprising calculating a third RNTI for random access transmissions with the second cell.
16. The WTRU of claim 13 , wherein the third RNTI is the same as the first RNTI or the second RNTI.