Method and apparatus for control of enhanced dedicated channel transmissions

• US 20070025300A1
• Filed: 05/31/2006
• Published: 02/01/2007
• Est. Priority Date: 08/01/2005
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Zhang, Guodong, Pan, Jung-Lin, Terry, Stephen, Wang, Peter
• Granted Patent: US 8,204,007 B2
• Time in Patent Office: Days
• US Class Current: 370/335
• 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 for controlling enhanced dedicated channel (E-DCH) transmissions, the method comprising:

(a) receiving a scheduling grant;

(b) processing the scheduling grant to calculate a serving grant;

(c) determining whether a hybrid automatic repeat request (H-ARQ) process for scheduled data and scheduled data are both available, and if so determining whether a serving grant exists;

(d) calculating a remaining power based on a maximum allowed power;

(e) restricting E-DCH transport format combination (E-TFC) based on the remaining power; and

(f) selecting an E-TFC and generating a protocol data unit (PDU) for transmission over an E-DCH.

2. The method of claim 1 wherein the received scheduled grant is processed at each of a plurality of transmission time intervals (TTIs).

3. The method of claim 1 wherein the received scheduled grant is stored in a grant list when there is no data to be transmitted in a transmission time interval (TTI) associated to the scheduled grant.

4. The method of claim 3 wherein only the last N absolute grants are stored in the grant list, and the serving grant is calculated based on the last N absolute grants.

5. The method of claim 3 wherein only the most recent primary absolute grant and subsequent relative grants including the latest secondary absolute grant are stored in the grant list to calculate the serving grant.

6. The method of claim 5 wherein when a new primary absolute grant is received previous absolute grant and relative grants except for the last secondary absolute grant are removed from the grant list when a next transmission requiring a scheduling grant occurs.

7. The method of claim 3 wherein all stored scheduling grants in the grant list are discarded when a serving cell change occurs.

8. The method of claim 1 wherein if there is no serving grant, the E-TFC is limited to a minimum set of E-TFCs.

9. The method of claim 1 further comprising:

(g) if it is determined at step (c) that either the H-ARQ process for scheduled data or the scheduled data is not available, determining whether an H-ARQ process for non-scheduled data and non-scheduled data are both available, and if so, determining whether a non-scheduled grant exists; and

(h) if a non-scheduled grant exists, proceeding to step (d).

10. The method of claim 9 further comprising:

(i) if it is determined at step (g) that either the H-ARQ process for non-scheduled data or the non-scheduled data is not available, determining whether there is any H-ARQ process available;

(j) if there is an available H-ARQ process, determining whether a triggering event for reporting scheduling information occurs;

(k) if the triggering event occurs, generating scheduling information bits and proceeding to step (d); and

(l) if the triggering event does not occur, waiting for the next transmission time interval (TTI).

11. The method of claim 10 further comprising:

(m) if it is determined that there is no available H-ARQ process, setting a happy bit for transmission in this TTI.

12. The method of claim 9 further comprising:

(i) if it is determined at step (h) that there is no non-scheduled grant, determining whether there is any H-ARQ process available;

(j) if there is an available H-ARQ process, determining whether a triggering event for reporting scheduling information occurs;

(k) if the triggering event occurs, generating scheduling information bits and proceeding to step (d); and

(l) and if the triggering event does not occur, waiting for the next transmission time interval (TTI).

13. The method of claim 12 further comprising:

(m) if it is determined at step (i) that there is no available H-ARQ process, setting a happy bit for transmission in this TTI.

14. In a wireless communication system including a wireless transmit/receive unit (WTRU) and a Node-B wherein the WTRU is allocated with an enhanced dedicated channel (E-DCH) for uplink transmission, an enhanced uplink medium access control (MAC-e) entity in the WTRU for controlling E-DCH transmissions, the MAC-e comprising:

a serving grant processing entity configured to receive a scheduling grant and process the scheduling grant to calculate a serving grant;

an E-DCH transport format combination (E-TFC) selection entity configured to calculate a remaining power based on a maximum allowed power, restrict an E-TFC based on the remaining power, and select an E-TFC;

a multiplexing and transmission sequence number (TSN) setting entity configured to generate a MAC-e protocol data unit (PDU); and

a hybrid automatic repeat request (H-ARQ) entity configured to control a plurality of H-ARQ processes for transmission of the MAC-e PDU via one of the H-ARQ processes.

15. The MAC-e of claim 14 wherein the serving grant processing entity processes the received scheduled grant at each of a plurality of transmission time intervals (TTIs).

16. The MAC-e of claim 14 wherein the serving grant processing entity stores the received scheduled grant in a grant list when there is no data to be transmitted in a transmission time interval (TTI) associated to the scheduled grant.

17. The MAC-e of claim 16 wherein the serving grant processing entity uses only the last N absolute grants in the grant list to calculate the serving grant.

18. The MAC-e of claim 16 wherein the serving grant processing entity stores only the most recent primary absolute grant and subsequent relative grants including the latest secondary absolute grant in the grant list to calculate the serving grant.

19. The MAC-e of claim 18 wherein the serving grant processing entity removes previous absolute grant and relative grants except for the last secondary absolute grant from the grant list when a new primary absolute grant is received and a next transmission requiring a scheduling grant occurs.

20. The MAC-e of claim 16 wherein the serving grant processing entity discards all stored scheduling grants in the grant list when a serving cell change occurs.

21. The MAC-e of claim 14 wherein the E-TFC selection entity is configured to check the serving grant, whereby if there is no serving grant, the E-TFC selection entity limits the E-TFC to a minimum set of E-TFCs before calculating a remaining power.

22. The MAC-e of claim 14 wherein the serving grant processing entity is configured to calculate the serving grant when both an H-ARQ process for scheduled data is available and scheduled data is available.

23. The MAC-e of claim 14 wherein the E-TFC selection entity is configured to calculate the remaining power for transmission in the next transmission time interval (TTI) when an H-ARQ process for non-scheduled data is available and non-scheduled data is available and there is a non-scheduled grant.

24. The MAC-e of claim 14 wherein the E-TFC selection entity is configured to calculate the remaining power for transmission in the next transmission time interval (TTI) when there is an available H-ARQ process and a triggering event for reporting scheduling information occurs.