Supporting DL Triggered HS-DPCCH in a cell in CELL_FACH

• US 20130044663A1
• Filed: 08/07/2012
• Published: 02/21/2013
• Est. Priority Date: 08/15/2011
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Mohan, Siddharth, Sambhwani, Sharad Deepak, Agarwal, Ravi, Kapoor, Rohit, Bharadwaj, Arjun
• Granted Patent: US 8,761,068 B2
• Time in Patent Office: Days
• US Class Current: 370/311
• CPC Class Codes: H04W 74/0858 collision detection

Abstract

Apparatus and methods are described for initiating an operating a high speed uplink channel. A user equipment may receive an order from a Node B triggering a feedback response. The user equipment may perform a physical random access channel (PRACH) procedure in response to receiving the order, and may also initiate a collision resolution procedure The user equipment may transmit a current channel quality indicator (CQI) of the user equipment on a high speed dedicated physical control channel (HS-DPCCH) prior to achieving collision resolution.

Claims

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

receiving, at a user equipment, an order on a high speed shared control channel (HS-SCCH);

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 a current channel quality indicator (CQI) of the user equipment on a high speed dedicated physical control channel (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 a Node B with another user equipment performing a physical random access channel (PRACH) procedure.

5. The method of claim 4, wherein the identifier comprises an E-DCH Radio Network Temporary Identifier (E-RNTI) of the user equipment, and wherein transmitting the packet with the E-RNTI is further configured to trigger the Node B to associate the user equipment 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 (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 user equipment, an amount of data based on the CQI on a high speed physical downlink shared channel (HS-PDSCH) from a 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 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-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 T321 timer; and

entering a discontinuous reception (DRX) cycle upon expiry of the T321 timer.

14. A computer-readable medium, comprising:

at least one instruction operable to cause a computer at a user equipment to receive an order on a high speed shared control channel (HS-SCCH);

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 a current channel quality indicator (CQI) of the user equipment on a high speed dedicated physical control channel (HS-DPCCH) prior to achieving a collision resolution result from the collision resolution procedure.

15. 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);

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 a current channel quality indicator (CQI) of the user equipment on a high speed dedicated physical control channel (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:

a receiver for receiving an order on a high speed shared control channel (HS-SCCH);

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 a current channel quality indicator (CQI) of the user equipment on a high speed dedicated physical control channel (HS-DPCCH) prior to achieving a collision resolution result from the collision resolution procedure.

17. The user equipment apparatus of claim 16, 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 user equipment apparatus of claim 16, 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 a Node B with another user equipment performing a physical random access channel (PRACH) procedure.

20. The user equipment apparatus of claim 19, wherein the identifier comprises an E-DCH Radio Network Temporary Identifier (E-RNTI) of the user equipment, and wherein the transmitter is configured to transmit the packet with the E-RNTI triggering the Node B to associate the user equipment with an HS-DSCH Radio Network Transaction Identifier (H-RNTI).

21. The user equipment apparatus of claim 20, wherein transmitting the packet further comprises transmitting a Scheduling Information (SI) with the E-RNTI in a media access (MAC)-i header.

22. The user equipment apparatus of claim 19, wherein the transmitter is further configured to transmit the packet with the identifier when the user equipment has no data to transmit.

23. The user equipment apparatus of claim 16, 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 a Node B.

24. The user equipment apparatus of claim 16, wherein the order includes an access channel signature and a signature-to-resource mapping identifier, and

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

18. The user equipment apparatus of 16, wherein the order includes a start uplink message.