Method and apparatus for control of enhanced dedicated channel transmissions

• US 8,774,118 B2
• Filed: 06/14/2012
• Issued: 07/08/2014
• Est. Priority Date: 08/01/2005
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Terry, Stephen E., Zhang, Guodong, Pan, Kyle Jung-Lin, Wang, Peter Shaomin
• Primary Examiner(s): Brandt, Christopher M
• Application Number:
  US13/523,306
• Publication Number:
  US 20120257591A1
• Time in Patent Office: 754 Days
• Field of Search: 370/329, 370/431
• US Class Current: 370/329
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 52/346 distributing total power among users or channels
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/54 based on quality criteria
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method and apparatus for controlling enhanced dedicated channel (E-DCH) transmissions are disclosed. An enhanced uplink medium access control (MAC-e/es) entity processes a received scheduling grant to calculate a serving grant. The MAC-e/es entity determines whether both a hybrid automatic repeat request (H-ARQ) process for scheduled data and scheduled data are available. If an H-ARQ process for scheduled data and scheduled data are available, the MAC-e/es entity determines whether a serving grant exists. The MAC-e/es entity calculates a remaining power based on maximum allowed power and restricts an E-DCH transport format combination (E-TFC) based on the remaining power. The MAC-e/es entity selects an E-TFC using the serving grant and generates a MAC-e protocol data unit. The MAC-e/es entity may process the received scheduled grant is at each transmission time interval or may store the received scheduled grant in a grant list until there is E-DCH data to transmit.

Claims

1. A method, implemented in a wireless transmit/receive unit (WTRU), for controlling enhanced dedicated channel (E-DCH) transmissions, the method comprising:

receiving a plurality of primary absolute grants for E-DCH transmission for an upcoming transmission time interval (TTI);

processing at least one primary absolute grant of the plurality of primary absolute grants to calculate at least one serving grant for E-DCH transmission;

identifying a hybrid automatic repeat request (H-ARQ) process for use for the upcoming TTI;

determining whether the identified H-ARQ process for use for the upcoming TTI is an active H-ARQ process, wherein only an active H-ARQ process is used for transmission of scheduled data and a non-active H-ARQ process is not used for transmission of scheduled data;

determining whether scheduled data is available for transmission in the upcoming TTI;

on a condition that scheduled data is available for transmission and the identified H-ARQ process is an active H-ARQ process and is available for the transmission of the scheduled data in the upcoming TTI;

calculating a remaining power available for the upcoming TTI based on a maximum allowed power for the WTRU;

performing E-DCH transport format combination (E-TFC) restriction based on the remaining power;

selecting an E-TFC from a set of E-TFCs remaining after E-TFC restriction, wherein the E-TFC selection is based on the at least one serving grant;

generating a protocol data unit (PDU) for transmission over an E-DCH in accordance with the selected E-TFC; and

transmitting the PDU in accordance with the identified H-ARQ process.

2. The method of claim 1 wherein the at least one primary absolute grant of the plurality of primary absolute grants is processed at each of a plurality of TTIs.

3. The method of claim 1 wherein the at least one primary absolute grant of the plurality of primary absolute grants is stored in a grant list on a condition that there is no data to be transmitted in a TTI associated with the at least one primary absolute grant.

4. The method of claim 3 wherein on a condition that a new primary absolute grant is received, previous absolute grants except for a last secondary absolute grant are removed from the grant list on a condition that a next transmission requiring a primary absolute grant occurs.

5. The method of claim 3 wherein all stored primary absolute grants in the grant list are discarded on a condition that a serving cell change occurs.

6. The method of claim 1, further comprising:

on a condition that non-scheduled data is available for transmission in the upcoming TTI and the identified H-ARQ process is a non-active H-ARQ process;

determining whether a non-scheduled grant exists.

7. The method of claim 6, further comprising:

on a condition that the non-scheduled grant exists;

performing E-TFC restriction;

selecting an E-TFC based on the E-TFC restriction;

generating a PDU for transmission over an E-DCH in accordance with the selected E-TFC; and

transmitting the PDU in accordance with the identified H-ARQ process.

8. The method of claim 6, further comprising:

determining whether a triggering event for reporting scheduling information occurs;

on a condition that the triggering event occurs, generating scheduling information bits; and

on a condition that the triggering event does not occur, waiting for the next TTI.

9. The method of claim 1, further comprising:

setting a happy bit for transmission in the upcoming TTI to indicate whether the WTRU is satisfied with a current serving grant.

10. The method of claim 1, further comprising:

generating scheduling information bits on a condition that a triggering event for reporting scheduling information occurs.

11. The method of claim 1 wherein the PDU is an enhanced uplink medium access control (MAC-e) PDU.

12. The method of claim 1 wherein the at least one primary absolute grant is received from a Node-B.

13. The method of claim 1 wherein the at least one primary absolute grant is received over an enhanced dedicated channel absolute grant channel (E-AGCH).

14. The method of claim 1 wherein the upcoming TTI is the next TTI after a current TTI.

15. The method of claim 1, further comprising:

receiving a secondary absolute grant for E-DCH transmission for the upcoming TTI.

16. A wireless transmit/receive unit (WTRU) including an enhanced uplink medium access control (MAC-e) entity for controlling enhanced dedicated channel (E-DCH) transmissions, the WTRU comprising:

circuitry configured to receive a plurality of primary absolute grants and process at least one primary absolute grant of the plurality of primary absolute grants to calculate at least one serving grant for E-DCH transmission for an upcoming transmit time interval (TTI);

circuitry configured to identify a hybrid automatic repeat request (H-ARQ) process for use for the upcoming TTI;

circuitry configured to determine whether the identified H-ARQ process for use for the upcoming TTI is an active H-ARQ process, wherein only an active H- ARQ process is used for transmission of scheduled data and a non-active H-ARQ process is not used for transmission of scheduled data;

circuitry configured to determine whether scheduled data is available for transmission in the upcoming TTI;

on a condition that scheduled data is available for transmission and the identified H-ARQ process is an active H-ARQ process and is available for the transmission of the scheduled data in the upcoming TTI;

the WTRU further comprises;

circuitry configured to calculate a remaining power available for the upcoming TTI based on a maximum allowed power;

circuitry configured to perform E-DCH transport format combination (E-TFC) restriction based on the remaining power;

circuitry configured to select an E-TFC from a set of E-TFCs remaining after E-TFC restriction, wherein the E-TFC selection is based on the at least one serving grant;

circuitry configured to generate a MAC-e protocol data unit (PDU) for transmission over an E-DCH in accordance with the selected E-TFC; and

circuitry configured to transmit the MAC-e PDU in accordance with the identified H-ARQ process.

17. The WTRU of claim 16 wherein the at least one primary absolute grant of the plurality of primary absolute grants is processed at each of a plurality of TTIs.

18. The WTRU of claim 16 wherein the at least one primary absolute grant of the plurality of primary absolute grants is stored in a grant list on a condition that there is no data to be transmitted in a TTI associated with the at least one primary absolute grant.

19. The WTRU of claim 18 wherein a previous absolute grant except for a last secondary absolute grant are removed from the grant list on a condition that a new primary absolute grant is received and a next transmission requiring a primary absolute grant occurs.

20. The WTRU of claim 18 wherein all stored primary absolute grants in the grant list are discarded on a condition that a serving cell change occurs.

21. The WTRU of claim 16, further comprising

circuitry configured to determine whether a non-scheduled grant exists on a condition that non-scheduled data is available for transmission in the upcoming TTI and the identified H-ARQ process is a non-active H-ARQ process.

22. The WTRU of claim 21, further comprising:

circuitry configured to, on a condition that the non-scheduled grant exists, perform E-TFC restriction, select an E-TFC based on the E-TFC restriction, generate a PDU for transmission over an E-DCH in accordance with the selected E-TFC, and transmit the PDU in accordance with the identified H-ARQ process.

23. The WTRU of claim 16, further comprising circuitry configured to set a happy bit for transmission in the upcoming TTI to indicate whether the WTRU is satisfied with a current serving grant.

24. The WTRU of claim 16 wherein the WTRU is configured to generate scheduling information bits on a condition that a triggering event for reporting scheduling information occurs.

25. The WTRU of claim 16 wherein the at least one primary absolute grant is received from a Node-B.

26. The WTRU of claim 16 wherein the at least one primary absolute grant is received over an enhanced dedicated channel absolute grant channel (E-AGCH).

27. The WTRU of claim 16 wherein the upcoming TTI is the next TTI after a current TTI.

28. The WTRU of claim 16, further comprising:

circuitry configured to determine whether a triggering event for reporting scheduling information occurs;

circuitry configured to generate scheduling information bits on a condition that the triggering event occurs;

circuitry configured to wait for the next TTI on a condition that the triggering event occurs.

29. The WTRU of claim 16, further comprising:

circuitry configured to receive a secondary absolute grant for E-DCH transmission for the upcoming TTI.