Method and apparatus for reducing uplink and downlink transmission errors in a third generation cellular system

• US 20040009786A1
• Filed: 05/09/2003
• Published: 01/15/2004
• Est. Priority Date: 05/10/2002
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Terry, Stephen E.
• Granted Patent: US 7,408,904 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0031 Multiple signaling transmission H04L1/1664, F15 take precedence
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1822 involving configuration of automatic repeat request [ARQ] with parallel processes
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04L 2001/125 Arrangements for preventing errors in the return channel

Abstract

A method and apparatus for supporting Adaptive Modulation and Coding (AM&C) and Hybrid Automatic Repeat Request (H-ARQ) functions in a cellular system including at least one wireless transmit/receive unit (WTRU) and a Node B. A signal is received at the WTRU indicating a need for AM&C and H-ARQ control signaling. An AM&C and H-ARQ control signaling transport channel (TrCH) is dynamically allocated by informing a transport format selection process of the need for AM&C and H-ARQ control signaling. The transport format is selected for required transmission time intervals (TTIs) which assign transport format combinations (TFCs) to establish the AM&C and H-ARQ control signaling transport channel.

Claims

1. A method for supporting adaptive modulation and coding (AM&

C) and hybrid automatic repeat request (H-ARQ) functions in a cellular system, the method comprising;

(a) receiving at a wireless transmit/receive unit (WTRU) a signal indicating a need for AM&

C and H-ARQ control signaling;

(b) dynamically allocating at least one AM&

C and H-ARQ signaling transport channel by informing a transport format selection process of the need for AM&

C and H-ARQ control signaling; and

(c) selecting a transport format set for required transmission time intervals (TTIs) of the transport channel which assign transport format combinations (TFCs) to establish the AM&

C and H-ARQ signaling transport channel.

2. The method of claim 1 wherein step (b) further comprises changing dynamic attributes of the transport channel on a TTI basis by generating a transport format combination indicator (TFCI).

3. The method of claim 2 wherein the dynamic attributes of the transport channel include a payload size.

4. The method of claim 1 wherein step (b) further comprises changing semi-static attributes of the transport channel using radio resource control (RRC) procedures.

5. The method of claim 4 wherein the semi-static attributes of the transport channel include a coding rate.

6. The method of claim 4 wherein the semi-static attributes of the transport channel include a TTI size.

7. The method of claim 4 wherein the semi-static attributes of the transport channel include a cyclic redundancy check (CRC).

8. The method of claim 1 wherein step (c) further comprises aligning the TTIs of the transport channel with AM&

C and H-ARQ signaling currently being applied to the transport channel.

9. Apparatus for supporting adaptive modulation and coding (AM&

C) and hybrid automatic repeat request (H-ARQ) functions in a cellular system, the apparatus comprising;

(a) means for receiving at a wireless transmit/receive unit (WTRU) a signal indicating a need for AM&

C and H-ARQ control signaling;

(b) means for dynamically allocating at least one AM&

C and H-ARQ signaling transport channel by informing a transport format selection process of the need for AM&

C and H-ARQ control signaling; and

(c) means for selecting a transport format set for required transmission time intervals (TTIs) of the transport channel which assign transport format combinations (TFCs) to establish the AM&

C and H-ARQ signaling transport channel.

10. The apparatus of claim 9 wherein the means for dynamically allocating at least one AM&

C and H-ARQ signaling transport channel further comprises means for changing dynamic attributes of the transport channel on a TTI basis by generating a transport format combination indicator (TFCI).

11. The apparatus of claim 10 wherein the dynamic attributes of the transport channel include a payload size.

12. The apparatus of claim 9 wherein the means for dynamically allocating at least one AM&

C and H-ARQ signaling transport channel further comprises means for changing semi-static attributes of the transport channel using radio resource control (RRC) procedures.

13. The apparatus of claim 12 wherein the semi-static attributes of the transport channel include a coding rate.

14. The apparatus of claim 12 wherein the semi-static attributes of the transport channel include a TTI size.

15. The apparatus of claim 12 wherein the semi-static attributes of the transport channel include a cyclic redundancy check (CRC).

16. The apparatus of claim 9 wherein the means for selecting a transport format set further comprises means for aligning the TTIs of the transport channel with AM&

C and H-ARQ signaling currently being applied to the transport channel.

17. In a cellular system including at least one wireless transmit/receive unit (WTRU) in communication with a Node B, each of the WTRU and the Node B including at least one medium access control (MAC) entity, a method for supporting adaptive modulation and coding (AM&

C) and hybrid automatic repeat request (H-ARQ) functions used for uplink and/or downlink operation, the method comprising;

(a) aligning at least one transmission time interval (TTI) of a transport channel using a dedicated coded composite with AM&

C and H-ARQ transmissions;

(b) demultiplexing the transport channel from the dedicated coded composite;

(c) terminating a new control signaling transport channel between MAC entities in the WTRU and the Node B;

(d) the MAC entities invoking the AM&

C and H-ARQ transmissions; and

(e) instructing each of the MAC entities to which the new control signaling transport channel is terminated to perform a transport format combination (TFC) selection function to allocate the new control signaling transport channel within the TTI.

18. Apparatus for supporting adaptive modulation and coding (AM&

C) and hybrid automatic repeat request (H-ARQ) functions used for uplink and/or downlink operation, the apparatus comprising;

(a) at least one wireless transmit/receive unit (WTRU) including at least one medium access control (MAC) entity for invoking AM&

C and H-ARQ transmissions;

(b) a Node B including at least one MAC entity for invoking the AM&

C and H-ARQ transmissions, the Node B being in communication with the WTRU;

(c) means for aligning at least one transmission time interval (TTI) of a transport channel using a dedicated coded composite with AM&

C and H-ARQ transmissions;

(d) means for demultiplexing the transport channel from the dedicated coded composite;

(e) means for terminating a new control signaling transport channel between MAC entities in the WTRU and the Node B; and

(f) means for instructing each of the MAC entities to which the new control signaling transport channel is terminated to perform a transport format combination (TFC) selection function to allocate the new control signaling transport channel within the TTI.

19. A method for supporting control signaling in a wireless communication system, the method comprising:

(a) receiving at a wireless transmit/receive unit (WTRU) a signal indicating a need for control signaling;

(b) dynamically allocating at least one transport channel for said control signaling; and

(c) selecting a transport format set to support said allocated transport channel.

20. Apparatus for supporting control signaling comprising:

(a) means for receiving at a wireless transmit/receive unit (WTRU) a signal indicating a need for control signaling;

(b) means for dynamically allocating at least one transport channel for control signaling; and

(c) means for selecting a transport format set to support said allocated transport channel.