Random access signaling transmission for system access in wireless communication

1. An apparatus for wireless communication, comprising:

at least one processor configured to determine at least one parameter value for at least one transmission parameter for random access signaling based on a particular user equipment (UE) class, the at least one transmission parameter having different values for a plurality of UE classes, and to send the random access signaling based on the at least one parameter value for system access; and

a memory coupled to the at least one processor;

wherein the at least one processor is further configured to send a random access preamble on a first channel, to receive a random access response on a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH) comprising a radio network temporary identifier (RNTI), a timing advance, uplink (UL) resources and a power control (PC) correction, and to send a message as the random access signaling on a second channel; and

wherein the at least one processor is further configured to determine a transmit power based on the at least one transmission parameter value.

2. The apparatus of claim 1 , wherein the at least one transmission parameter comprises at least one of a target signal-to-noise ratio (SNR), a power offset, and a correction factor.

3. The apparatus of claim 1 , wherein the random access signaling comprises a random access preamble sent first for system access.

4. The apparatus of claim 3 , wherein the at least one transmission parameter comprises a target signal-to-noise ratio (SNR) for the random access preamble, transmit power of the random access preamble is based on a target SNR value for the particular UE class, and wherein the at least one processor is further configured to send the random access preamble with the determined transmit power.

5. The apparatus of claim 1 , wherein transmit power of the random access preamble is based on an interference level of a time-frequency slot used to send the random access preamble.

6. The apparatus of claim 1 , wherein the at least one transmission parameter comprises a backoff time, and wherein the at least one processor is configured to determine amount of time to wait between successive transmissions of the random access preamble based on a backoff time value for the particular UE class.

7. The apparatus of claim 1 , wherein the at least one transmission parameter comprises a power ramp, and wherein transmit power for successive transmissions of the random access preamble is based on a power ramp value for the particular UE class.

8. The apparatus of claim 1 , wherein the at least one transmission parameter comprises a power offset between the first and second channels, and wherein transmit power of the message is based on a power offset value for the particular UE class, and wherein the at least one processor is further configured to send the message with the determined transmit power.

9. The apparatus of claim 1 , wherein the at least one processor is configured to send the random access signaling for initial system access at power up, or for system access to transition to an active state, or for system access for handover.

10. A method for wireless communication, comprising:

determining at least one parameter value for at least one transmission parameter for random access signaling based on a particular user equipment (UE) class, the at least one transmission parameter having different values for a plurality of UE classes; and

sending the random access signaling based on the at least one parameter value for system access;

wherein the step of sending the random access signaling comprises sending a random access preamble on a first channel to receive a random access response on a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH) comprising a radio network temporary identifier (RNTI), a timing advance, uplink (UL) resources and a power control (PC) correction, and sending a message as the random access signaling on a second channel; and

determining a transmit power based on the at least one transmission parameter value.

11. The method of claim 10 , wherein the at least one transmission parameter comprises a target signal-to-noise ratio (SNR) for the random access preamble, and wherein the sending the random access signaling comprises:

the step of determining transmit power of the random access preamble based on a target SNR value for the particular UE class, and

sending the random access preamble with the determined transmit power.

12. The method of claim 10 , wherein the at least one transmission parameter comprises a backoff time, and wherein the method further comprises:

determining amount of time to wait between successive transmissions of the random access preamble based on a backoff time value for the particular UE class.

13. The method of claim 10 , wherein the at least one transmission parameter comprises a power ramp, and wherein the method further comprises:

determining transmit power for successive transmissions of the random access preamble based on a power ramp value for the particular UE class.

14. The method of claim 10 , wherein the at least one transmission parameter comprises a power offset between the first and second channels, and wherein the sending the random access signaling comprises: and

further comprising:

receiving the random access response;

determining transmit power of the message based on a power offset value for the particular UE class, and

wherein sending the message comprises sending the message with the determined transmit power.

15. An apparatus for wireless communication, comprising:

means for determining at least one parameter value for at least one transmission parameter for random access signaling based on a particular user equipment (UE) class, the at least one transmission parameter having different values for a plurality of UE classes; and

means for sending the random access signaling based on the at least one parameter value for system access;

wherein the means for sending the random access signaling comprises a means for sending a random access preamble on a first channel to receive a random access response on a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH) comprising a radio network temporary identifier (RNTI), a timing advance, uplink (UL) resources and a power control (PC) correction, and a means for sending a message as the random access signaling on a second channel; and

a means for determining a transmit power based on the at least one transmission parameter value.

16. The apparatus of claim 15 , wherein the at least one transmission parameter comprises a target signal-to-noise ratio (SNR) for the random access preamble, and wherein the means for sending the random access signaling comprises:

means for determining transmit power of the random access preamble based on a target SNR value for the particular UE class, and

means for sending the random access preamble with the determined transmit power.

17. The apparatus of claim 15 , wherein the at least one transmission parameter comprises a backoff time, and wherein the apparatus further comprises:

means for determining amount of time to wait between successive transmissions of the random access preamble based on a backoff time value for the particular UE class.

18. The apparatus of claim 15 , wherein the at least one transmission parameter comprises a power ramp, and wherein the apparatus further comprises:

means for determining transmit power for successive transmissions of the random access preamble based on a power ramp value for the particular UE class.

19. The apparatus of claim 15 , wherein the at least one transmission parameter comprises a power offset between the first and second channels, and wherein the means for sending the random access signaling comprises: and

further comprising:

means for receiving the random access response; and

means for determining transmit power of the message based on a power offset value for the particular UE class;

wherein the means for sending the message comprises means for sending the message with the determined transmit power.

20. A non-transitory computer readable medium comprising instructions which, when executed by a processor, cause the processor to perform operations including:

determining at least one parameter value for at least one transmission parameter for random access signaling based on a particular user equipment (UE) class, the at least one transmission parameter having different values for a plurality of UE classes; and

sending the random access signaling based on the at least one parameter value for system access;

wherein sending the random access signaling comprises sending a random access preamble on a first channel to receive a random access response on a physical downlink control channel (PDCCH) or physical downlink shared channel (PDSCH) comprising a radio network temporary identifier (RNTI), a timing advance, uplink (UL) resources and a power control (PC) correction, and sending a message as the random access signaling on a second channel; and

determining a transmit power based on the at least one parameter value.

21. An apparatus for wireless communication, comprising:

at least one processor configured to send a random access preamble for system access, to receive a random access response with a power control (PC) correction, uplink (UL) resources and a timing advance on a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH) comprising a radio network temporary identifier (RNTI), to send a message as random access signaling on a second channel, to determine transmit power of a message based on the PC correction, and to send the message with the determined transmit power; and

a memory coupled to the at least one processor.

22. The apparatus of claim 21 , wherein the at least one processor is configured to determine the transmit power of the message further based on transmit power of the random access preamble.

23. The apparatus of claim 21 , wherein the at least one processor is configured to determine the transmit power of the message further based on a power offset between a first channel used to send the random access preamble and a second channel used to send the message.

24. The apparatus of claim 21 , wherein the PC correction indicates an amount of increase or decrease in transmit power.

25. The apparatus of claim 21 , wherein the PC correction indicates whether to increase or decrease transmit power by a predetermined amount.

26. The apparatus of claim 21 , wherein the PC correction is generated based on received signal quality of the random access preamble at a base station.

27. A method for wireless communication, comprising:

sending a random access preamble for system access;

receiving a random access response with a power control (PC) correction, uplink (UL) resources and a timing advance on a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH) comprising a radio network temporary identifier (RNTI) to send a message as random access signaling on a second channel;

determining transmit power of a message based on the PC correction; and

sending the message with the determined transmit power.

28. The method of claim 27 , wherein the determining the transmit power of the message comprises determining the transmit power of the message further based on transmit power of the random access preamble.

29. The method of claim 27 , wherein the determining the transmit power of the message comprises determining the transmit power of the message further based on a power offset between a first channel used to send the random access preamble and a second channel used to send the message.

30. An apparatus for wireless communication, comprising:

means for sending a random access preamble for system access;

means for receiving a random access response with a power control (PC) correction, uplink (UL) resources and a timing advance on a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH) comprising a radio network temporary identifier (RNTI) to send a message as random access signaling on a second channel;

means for determining transmit power of a message based on the PC correction; and

means for sending the message with the determined transmit power.

31. The apparatus of claim 30 , wherein the means for determining the transmit power of the message comprises means for determine the transmit power of the message further based on transmit power of the random access preamble.

32. The apparatus of claim 30 , wherein the means for determining the transmit power of the message comprises means for determining the transmit power of the message further based on a power offset between a first channel used to send the random access preamble and a second channel used to send the message.

33. A non-transitory computer readable medium comprising instructions which, when executed by a processor, cause the processor to perform operations including:

sending a random access preamble for system access;

receiving a random access response with a power control (PC) correction, uplink (UL) resources and a timing advance on a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH) comprising a radio network temporary identifier (RNTI) to send a message as random access signaling on a second channel;

determining transmit power of a message based on the PC correction; and

sending the message with the determined transmit power.