Method for transmission time interval bundling in the uplink

Patent metadata

Field	Value
Publication number	US-9172509-B2
Application number	US-42183809-A
Country	US
Kind code	B2
Filing date	Apr 10, 2009
Priority date	Apr 11, 2008
Publication date	Oct 27, 2015
Grant date	Oct 27, 2015

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.

First claim

What is claimed is:

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.

Assignees

• Zhang Guodong
• Wang Jin
• Pan Kyle Jung-Lin
• Garvreau Jean-Louis
• Terry Stephen E
• Interdigital Patent Holdings

Inventors

• Zhang Guodong
• Wang Jin
• Pan Kyle Jung-Lin
• Garvreau Jean-Louis
• Terry Stephen E

Classifications

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04L1/189

  Transmission or retransmission of more than one copy of a message · CPC title

• H04L1/1621 Primary

  Group acknowledgement, i.e. the acknowledgement message defining a range of identifiers, e.g. of sequence numbers · CPC title

• H04L1/1635 Primary

  Cumulative acknowledgement, i.e. the acknowledgement message applying to all previous messages · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title