Method and apparatus for assigning radio resources and controlling transmission parameters on a random access channel
A method and apparatus for assigning radio resources and controlling parameters for transmission over a random access channel in wireless communications by enhancing a random access channel is disclosed.
1. A method comprising:
allocating resources for a wireless transmit and receive unit (WTRU) to transmit data in an enhanced uplink; and
broadcasting an indication of a maximum resource allocation and an indication of an initial serving grant to the WTRU.
2. The method of claim 1 , wherein the maximum resource allocation indicates a maximum amount of transmission time.
3. The method of claim 1 , further comprising:
receiving transmission from the WTRU in the enhanced uplink in accordance with the maximum resource allocation and the initial serving grant.
4. The method of claim 1 , further comprising broadcasting at least one of:
a maximum transmission rate that can be used for transmitting a random access channel (RACH) frame;
a maximum power that can be used for transmitting the RACH frame;
a maximum ratio of a RACH data part power to a power of a preamble;
an absolute maximum total power for transmission of the RACH frame;
a maximum power for transmission of the RACH frame relative to the power of a preamble;
a maximum RACH transport block size; or
a transmission time interval (TTI) size.
5. A network entity comprising:
a processor configured to:
allocate resources for a wireless transmit and receive unit (WTRU) to transmit data in an enhanced uplink; and
broadcast an indication of a maximum resource allocation and an indication of an initial serving grant to the WTRU.
6. The network entity of claim 5 , wherein the maximum resource allocation indicates a maximum amount of transmission time.
7. The network entity of claim 5 , wherein the processor is further configured to:
receive transmission from the WTRU in the enhanced uplink in accordance with the maximum resource allocation and the initial serving grant.
8. The network entity of claim 5 , wherein the processor is further configured to:
broadcast at least one of:
a maximum transmission rate that can be used for transmitting a random access channel (RACH) frame;
a maximum power that can be used for transmitting the RACH frame;
a maximum ratio of a RACH data part power to a power of a preamble;
an absolute maximum total power for transmission of the RACH frame;
a maximum power for transmission of the RACH frame relative to the power of a preamble;
a maximum RACH transport block size; or
a transmission time interval (TTI) size.
9. A method comprising:
sending a first set of available signatures reserved for random access channel (RACH) and a second set of available signatures reserved for enhanced uplink transmissions;
receiving a preamble from a wireless transmit and receive unit (WTRU); and
determining whether the WTRU is requesting enhanced uplink transmission resources based on whether the received preamble comprises a signature in the second set of available signatures.
10. The method of claim 9 , further comprising:
upon determining that the WTRU is requesting enhanced uplink transmission resources, allocating resources for the WTRU to transmit in an enhanced uplink.
11. The method of claim 9 , wherein it is determined that the WTRU is requesting enhanced uplink transmission resources when the received preamble comprises a signature in the second set of available signatures.
12. The method of claim 9 , wherein it is determined that the WTRU is not requesting uplink transmission resources when the received preamble comprises a signature in the first set of available signatures.
13. The method of claim 9 , further comprising:
sending a first set preamble scrambling codes reserved for random access channel (RACH) and a second set of scrambling codes reserved for an enhanced uplink.
14. The method of claim 13 , wherein the preamble is received via a preamble scrambling code in the second set of scrambling codes when WTRU is requesting enhanced uplink transmission resources.
15. A network entity comprising:
a processor configured to:
send a first set of available signatures reserved for random access channel (RACH) and a second set of available signatures reserved for enhanced uplink transmissions;
receive a preamble from a wireless transmit and receive unit (WTRU); and
determine whether the WTRU is requesting enhanced uplink transmission resources based on whether the received preamble comprises a signature in the second set of available signatures.
16. The network entity of claim 15 , wherein the processor is further configured to:
upon determining that the WTRU is requesting enhanced uplink transmission resources, allocate resources for the WTRU to transmit in an enhanced uplink.
17. The network entity of claim 15 , wherein it is determined that the WTRU is requesting enhanced uplink transmission resources when the received preamble comprises a signature in the second set of available signatures.
18. The network entity of claim 15 , wherein it is determined that the WTRU is not requesting uplink transmission resources when the received preamble comprises a signature in the first set of available signatures.
19. The network entity of claim 15 , wherein the processor is further configured to:
send a first set preamble scrambling codes reserved for random access channel (RACH) and a second set of scrambling codes reserved for an enhanced uplink.
20. The network entity of claim 19 , wherein the preamble is received via a preamble scrambling code in the second set of scrambling codes when WTRU is requesting enhanced uplink transmission resources.