Method and apparatus for reducing uplink and downlink transmission errors by supporting adaptive modulation and coding and hybrid automatic repeat request functions

• US 7,408,904 B2
• Filed: 05/09/2003
• Issued: 08/05/2008
• Est. Priority Date: 05/10/2002
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: InterDigital, Inc.
• Inventors: Terry, Stephen E.
• Primary Examiner(s): Nguyen; Chau
• Assistant Examiner(s): Kang; Suk Jin
• Application Number:
  US10/434,870
• Publication Number:
  US 20040009786A1
• Time in Patent Office: 1,915 Days
• Field of Search: None
• US Class Current: 370/337
• 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, the method comprising;

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

C and H-ARQ control signaling;

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;

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; and

aligning control channel TTIs with AM&

C and H-ARQ transmissions on the AM&

C and H-ARQ signaling transport channel such that each control channel TTI begins and ends at the same time as a corresponding AM&

C and H-ARQ transmission.

2. The method of claim 1 further comprising 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 further comprising 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. A wireless communication apparatus comprising:

a receiver for receiving at a wireless transmit/receive unit (WTRU) a signal indicating a need for adaptive modulation and coding (AM&

C) and hybrid automatic repeat request (H-ARQ) control signaling;

an allocator 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;

a selector 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; and

an aligner for aligning control channel TTIs with AM&

C and H-ARQ transmissions on the AM&

C and H-ARQ signaling transport channel such that each control channel TTI begins and ends at the same time as a corresponding AM&

C and H-ARQ transmission.

9. The apparatus of claim 8 wherein the allocator changes dynamic attributes of the transport channel on a TTI basis by generating a transport format combination indicator (TFCI).

10. The apparatus of claim 9 wherein the dynamic attributes of the transport channel include a payload size.

11. The apparatus of claim 8 wherein the allocator changes semi-static attributes of the transport channel using radio resource control (RRC) procedures.

12. The apparatus of claim 11 wherein the semi-static attributes of the transport channel include a coding rate.

13. The apparatus of claim 11 wherein the semi-static attributes of the transport channel include a TTI size.

14. The apparatus of claim 11 wherein the semi-static attributes of the transport channel include a cyclic redundancy check (CRC).