Method and apparatus for operating supplementary cells in licensed exempt spectrum

Patent metadata

Field	Value
Publication number	US-10153870-B2
Application number	US-201815882114-A
Country	US
Kind code	B2
Filing date	Jan 29, 2018
Priority date	Feb 7, 2011
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

A method and apparatus for operating supplementary cells in licensed exempt (LE) spectrum. An aggregating cell operating in a frequency division duplex (FDD) licensed spectrum is aggregated with a LE supplementary cell operating in a time sharing mode for uplink (UL) and downlink (DL) operations. The LE supplementary cell may be an FDD supplementary cell dynamically configurable between an UL only mode, a DL only mode, and a shared mode, to match requested UL and DL traffic ratios. The LE supplementary cell may be a time division duplex (TDD) supplementary cell. The TDD supplementary cell may be dynamically configurable between multiple TDD configurations. A coexistence capability for coordinating operations between the LE supplementary cell with other systems operating in the same channel is provided. Coexistence gaps are provided to measure primary/secondary user usage and permit other systems operating in the LE supplementary cell channel to access the channel.

First claim

What is claimed is:

1. A method of carrier aggregation, comprising:
operating on a frequency division duplex (FDD) primary cell aggregated with a time division duplex (TDD) supplementary cell;
receiving a downlink (DL) transmission;
determining a timing based on the timing used for the primary cell for hybrid automatic repeat request (HARQ) feedback for the DL transmission; and
sending the HARQ feedback on the FDD primary cell based on the determined timing.

2. The method of claim 1 , wherein the HARQ feedback timing is set for a sub-frame (n+4).

3. The method of claim 1 , wherein the DL transmission is on the TDD supplementary cell.

4. The method of claim 1 , wherein the DL transmission is on the FDD primary cell.

5. The method of claim 1 , further comprising sending positive acknowledgement (ACK)/negative acknowledgement (NACK) n+4 subframes following the DL transmission.

6. The method of claim 1 , wherein the DL HARQ feedback is carried in a physical UL control channel (PUCCH).

7. The method of claim 6 , wherein the PUCCH is on the FDD primary cell.

8. The method of claim 1 , wherein multiple TDD supplementary cells are aggregated, each TDD supplementary cell being one of independently or dependently configured.

9. A wireless transmit/receive unit (WTRU), comprising:
a processor; and
a memory having stored instructions that when executed by the processor cause the WTRU to:
operate on a FDD primary cell aggregated with a TDD supplementary cell;
receive a DL transmission on the TDD supplementary cell;
determine a timing for HARQ feedback for the DL transmission; and
send the HARQ feedback on the FDD primary cell based on the determined timing.

10. The WTRU of claim 9 , wherein, wherein the HARQ feedback timing is set for a sub-frame (n+4).

11. The WTRU of claim 9 , wherein the WTRU sends an ACK/NACK n+4 subframes following the DL transmission.

12. A method of carrier aggregation, comprising:
operating on a FDD primary cell aggregated with a TDD supplementary cell;
sending an uplink (UL) transmission in a sub-frame (n);
determining a timing for hybrid automatic repeat request (HARQ) feedback for the UL transmission;
receiving the HARQ feedback on the FDD primary cell; and
associating the HARQ feedback with the UL transmission based on the determined timing.

13. The method of claim 12 , wherein the HARQ feedback timing is set for a sub-frame (n+4).

14. The method of claim 12 , wherein the UL transmission is on the TDD supplementary cell.

15. The method of claim 12 , wherein the UL transmission is on the FDD primary cell.

16. The method of claim 12 , further comprising receiving an ACK/NACK n+4 subframes following the UL transmission.

17. The method of claim 12 , wherein UL HARQ feedback is carried in a modified physical HARQ indicator channel (PHICH).

18. The method of claim 17 , wherein the PHICH is carried on the primary cell.

19. The method of claim 12 , wherein multiple TDD supplementary cells are aggregated, each TDD supplementary cell being one of independently or dependently configured.

Assignees

• Interdigital Patent Holdings Inc
• Interdigital Patent Holdongs Inc

Inventors

• Gauvreau Jean-Louis
• Freda Martino M
• Lin Zinan
• Murray Joseph M
• Ye Chunxuan
• Bala Erdem
• Beluri Mihaela C
• Castor Douglas R
• Chincholi Amith V
• Cuffaro Angelo A
• Dai Yuying
• Demir Alpaslan
• Gredone Joseph
• Yang Rui
• Ma Liangping
• Di Girolamo Rocco
• Purkayastha Debashish
• Touag Athmane

Classifications

• H04W72/541

  using the level of interference · CPC title

• H04W16/24

  Cell structures · CPC title

• H04L1/1893 Primary

  Physical mapping arrangements (physical resource mapping in general H04L5/00) · CPC title

• H04W72/082

  Electricity · mapped topic

• H04W72/0453

  Resources in frequency domain, e.g. a carrier in FDMA · CPC title