Method for transmission time interval bundling in the uplink

• US 9,172,509 B2
• Filed: 04/10/2009
• Issued: 10/27/2015
• Est. Priority Date: 04/11/2008
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Inventors: Zhang, Guodong, Wang, Jin, Pan, Kyle Jung-Lin, Terry, Stephen E., Garvreau, Jean-Louis
• Primary Examiner(s): Liu, Jung-Jen
• Application Number:
  US12/421,838
• Publication Number:
  US 20090257408A1
• Time in Patent Office: 2,391 Days
• Field of Search: 370/203, 370204-215, 370229-240, 370241-253, 370310-337, 370/395.3, 370/395.4, 370/395.41, 370/395.42, 370/395.5, 370/395.52, 370431-457, 370458-463, 370464-497, 370498-522, 370523-520, 370521-529
• US Class Current: 1/1
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/1621 Group acknowledgement, i.e. the acknowledgement message defining a range of identifiers, e.g. of sequence numbers
• CPC Class Codes: H04L 1/1635 Cumulative acknowledgement, i.e. the acknowledgement message applying to all previous messages
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/189 Transmission or retransmission of more than one copy of a message
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management

Abstract

A method and apparatus for supporting uplink Transmission Time Interval (TTI) bundling in Long Term Evolution (LTE) is provided. Described are related method and apparatus for signaling, activation/deactivation and wireless transmit/receive unit (WTRU) behavior.

Claims

1. A method for supporting uplink Transmission Time Interval (TTI) bundling, the method comprising:

receiving, via a physical downlink control channel (PDCCH) or a medium access control (MAC) control element (CE), a TTI bundling message that enables a wireless transmit/receive unit (WTRU) to support uplink TTI bundling, the TTI bundling message including a TTI bundling active/de-active field and a TTI bundling configuration;

determining a state of a hybrid acknowledgement repeat request (HARQ) process;

determining an uplink TTI bundling procedure using the TTI bundling message and the HARQ process state; and

sending a transmission via a physical uplink shared channel (PUSCH) using the determined TTI bundling procedure.

2. The method of claim 1, wherein the TTI bundling message further includes at least one of a value for a number of bundled sub-frames, a number of TTIs in a TTI bundle, or a maximum number of HARQ re-transmissions.

3. The method of claim 1, wherein the TTI bundling message uses a bit-field in a radio block (RB) allocation field, a bit-field in a modulation and coding scheme (MCS) field, or a bit-field in a demodulation reference symbol (DMRS) field.

4. The method of claim 1, wherein sending the transmission via the PUSCH using the determined TTI bundling procedure further comprises using a radio block (RB) allocation and a modulation and coding scheme (MCS) on a condition that TTI bundling is activated.

5. The method of claim 4, further comprising receiving the RB allocation via a MCS field or a demodulation reference symbol (DMRS) field.

6. The method of claim 4, further comprising receiving the MCS via a MCS field or a demodulation reference symbol (DMRS) field.

7. The method of claim 1, wherein the TTI bundling message is in a PDCCH DCI format 0.

8. The method of claim 7, wherein the TTI bundling message is of a length equivalent to a PDCCH format 1A.

9. The method of claim 1, wherein the TTI bundling active/de-active field is included within a header of the MAC CE.

10. The method of claim 1, wherein the TTI bundling message includes a redundancy version (RV) value.

11. The method of claim 10, wherein the RV value can be configured dynamically or semi-statically.

12. The method of claim 1, wherein the TTI bundling message indicates a condition that should trigger TTI bundling.

13. The method of claim 1, further comprising clearing a HARQ buffer.

14. The method of claim 1, further comprising activating TTI bundling with the HARQ process.

15. The method of claim 1, further comprising providing the HARQ process until success or failure for a minimum number of retransmissions.

16. The method of claim 14, further comprising applying TTI bundling upon activation.

17. The method of claim 14, further comprising ensuring that a data transmission is not scheduled for a fixed duration.

18. The method of claim 1, further comprising deactivating TTI bundling when the HARQ process state indicates that the HARQ process is active.

19. The method of claim 1, wherein sending the transmission via PUSCH using the determined TTI bundling procedure further comprises sending in a non-bundled mode in response to receipt of the TTI bundling message within a predefined interval.

20. The method of claim 1, further comprising detecting an error condition with respect to the TTI bundling message and a current configuration of the WTRU.

21. The method of claim 1, further comprising configuring at least one service in a TTI bundling mode.

22. The method of claim 1, wherein the TTI bundling message indicates that TTI bundling is activated for semi-persistent scheduling.

23. A wireless transmit/receive unit (WTRU), the WTRU comprising:

a processor, the processor configured to;

receive a TTI bundling message, via a physical downlink control channel (PDCCH) or a medium access control (MAC) control element (CE), that enables a WTRU to support uplink TTI bundling, the TTI bundling message including a TTI bundling activate/de-activate field and a TTI bundling configuration;

determine an uplink TTI bundling procedure using the TTI bundling message and the HARQ process state; and

send a transmission via physical uplink shared channel (PUSCH) using the determined bundling procedure.