Supporting DL triggered HS-DPCHH in a cell in CELL

1. A method of initiating a high speed uplink channel, comprising:

receiving, at a user equipment (UE), an order on a high speed shared control channel (HS-SCCH) from a Node B, wherein the order is configured to trigger the UE to start transmitting on a high speed dedicated physical control channel (HS-DPCCH) in CELL_FACH;

performing a physical random access channel (PRACH) procedure in response to the receiving of the order;

performing a collision resolution procedure in response to the receiving of the order; and

transmitting, in response to the order, a current channel quality indicator (CQI) of the UE on the HS-DPCCH prior to achieving a collision resolution result from the collision resolution procedure.

2. The method of claim 1 , further comprising:

upon receiving the order, determining that the order includes a common enhanced uplink dedicated channel (E-DCH) resource index;

skipping performing the collision resolution procedure in response to determining that the order includes a common E-DCH resource index; and

transmitting the CQI upon completion of the PRACH procedure.

3. The method of claim 1 , wherein the order includes a start uplink message.

4. The method of claim 1 , further comprising:

transmitting a packet having an identifier in response to receiving the order, wherein the packet with the identifier is configured to avoid confusion at the Node B with another user equipment performing the PRACH procedure.

5. The method of claim 4 , wherein the identifier comprises an E-DCH Radio Network Temporary Identifier (E-RNTI) of the UE, and wherein transmitting the packet with the E-RNTI is further configured to trigger the Node B to associate the UE with an HS-DSCH Radio Network Transaction Identifier (H-RNTI).

6. The method of claim 5 , wherein transmitting the packet further comprises transmitting a Scheduling Information (SI) with the E-RNTI in a media access control (MAC)-i header.

7. The method of claim 4 , wherein transmitting the packet with the identifier further comprises transmitting when the user equipment has no data to transmit.

8. The method of claim 1 , further comprising receiving, at the UE, an amount of data based on the CQI on a high speed physical downlink shared channel (HS-PDSCH) from the Node B.

9. The method of claim 1 , wherein the order includes an access channel signature and a signature-to-resource mapping identifier, and

wherein the PRACH procedure is performed according to the access channel signature identifier and the signature-to-resource mapping identifier in response to receiving the order.

10. The method of claim 1 , wherein the order includes an indicator to start an uplink transmission, the method further comprising:

starting a timer having a known amount of time relative to the Node B in response to decoding the order;

determining an expiration of the timer; and

stopping transmissions on the HS-DPCCH in response to the expiration of the timer.

11. The method of claim 10 , further comprising setting the timer with the known amount of time, wherein the known amount of time comprises an E-DCH transmission continuation backoff value.

12. The method of claim 10 , further comprising resetting the timer when a medium access control-ehs packet data unit (MAC-ehs PDU) is received or when a Total E-DCH Buffer Status (TEBS) byte has a value is greater than or less than zero while the timer is running.

13. The method of claim 10 , further comprising performing the following upon the expiration of the timer:

reporting the TEBS byte having the value of zero to the Node B as Scheduling Information (SI) in a MAC-i PDU, wherein the MAC-i PDU indicates to the radio link control (RLC) layer for each logical channel that no PDUs will be transferred to the MAC layer;

starting a T 321 timer; and

entering a discontinuous reception (DRX) cycle upon expiry of the T 321 timer.

14. The method of claim 1 , wherein receiving the order further comprises receiving the order when the Node B has downlink data to transmit.

15. A non-transitory computer-readable medium, comprising:

at least one instruction operable to cause a computer at a user equipment (UE) to receive an order on a high speed shared control channel (HS-SCCH) from a Node B, wherein the order is configured to trigger the UE to start transmitting on a high speed dedicated physical control channel (HS-DPCCH) in CELL_FACH;

at least one instruction operable to cause the computer to perform a physical random access channel (PRACH) procedure in response to the receiving of the order;

at least one instruction operable to cause the computer to perform a collision resolution procedure in response to the receiving of the order; and

at least one instruction operable to cause the computer to transmit, in response to the order, a current channel quality indicator (CQI) of the UE on the HS-DPCCH prior to achieving a collision resolution result from the collision resolution procedure.

16. A user equipment apparatus for initiating a high speed uplink channel, comprising:

means for receiving an order on a high speed shared control channel (HS-SCCH) from a Node B, wherein the order is configured to trigger the UE to start transmitting on a high speed dedicated physical control channel (HS-DPCCH) in CELL_FACH;

means for performing a physical random access channel (PRACH) procedure in response to the receiving of the order;

means for performing a collision resolution procedure in response to the receiving of the order; and

means for transmitting, in response to the order, a current channel quality indicator (CQI) of the UE on the DS-DPCCH prior to achieving a collision resolution result from the collision resolution procedure.

17. A user equipment (UE) apparatus for initiating a high speed uplink channel, comprising:

a receiver for receiving an order on a high speed shared control channel (HS-SCCH) from a Node B, wherein the order is configured to trigger the UE to start transmitting on a high speed dedicated physical control channel (HS-DPCCH) in CELL 13 FACH;

a processor for performing a physical random access channel (PRACH) procedure in response to the receiving of the order, and for performing a collision resolution procedure in response to the receiving of the order; and

a transmitter for transmitting, in response to the order, a current channel quality indicator (CQI) of the UE on the HS-DPCCH prior to achieving a collision resolution result from the collision resolution procedure.

18. The UE apparatus of claim 17 , wherein:

the processor is further configured to determine that the order includes a common enhanced uplink channel (E-DCH) resource index, and to skip performing the collision resolution procedure in response to determining that the order includes a common E-DCH resource index, and

the transmitter is further configured to transmit the CQI upon completion of the PRACH procedure.

19. The UE apparatus of 17 , wherein the order includes a start uplink message.

20. The UE of claim 17 , wherein the transmitter is further configured to transmit a packet having an identifier in response to receiving the order, wherein the packet with the identifier is configured to avoid confusion at the Node B with another user equipment performing the PRACH procedure.

21. The UE apparatus of claim 20 , wherein the identifier comprises an E-DCH Radio Network Temporary Identifier (E-RNTI) of the UE, and wherein the transmitter is configured to transmit the packet with the E-RNTI triggering the Node B to associate the UE with an HS-DSCH Radio Network Transaction Identifier (H-RNTI).

22. The UE apparatus of claim 21 , wherein transmitting the packet further comprises transmitting a Scheduling Information (SI) with the E-RNTI in a media access control (MAC)-i header.

23. The UE of claim 17 , wherein the receiver is further configured to receive an amount of data based on the CQI on a high speed physical downlink shared channel (HS-PDSCH) from the Node B.

24. The UE apparatus of claim 17 , wherein the order includes an access channel signature and a signature-to-resource mapping identifier, and

wherein the PRACH procedure is performed according to the access channel signature identifier and the signature-to-resource mapping identifier in response to receiving the order.

25. The user equipment apparatus of claim 20 , wherein the transmitter is further configured to transmit the packet with the identifier when the user equipment has no data to transmit.

26. The user equipment apparatus of claim 17 , wherein the receiver is configured to receive the order when the Node B has downlink data to transmit.