Dynamic signaling of the downlink and uplink subframe allocation for a TDD wireless communication system

Patent metadata

Field	Value
Publication number	US-9923690-B2
Application number	US-201414450931-A
Country	US
Kind code	B2
Filing date	Aug 4, 2014
Priority date	Aug 6, 2013
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

An apparatus for use in a wireless communication network, comprising a processing resource configured to determine a time interval for periodic time division duplex (TDD) Uplink/Downlink (UL/DL) reconfiguration windows, generate a UL/DL reconfiguration command to indicate a dynamic TDD UL/DL allocation change, and encode the UL/DL reconfiguration command in a physical downlink control channel (PDCCH) data, and a radio front end (RF) interface coupled to the processing resource and configured to cause the encoded UL/DL reconfiguration command to be transmitted to a first of a plurality of wireless user equipment (UEs) in a first of the UL/DL reconfiguration windows, wherein the encoded UL/DL reconfiguration command is transmitted via a PDCCH to provide a fast TDD UL/DL reconfiguration.

First claim

What is claimed is:

1. An apparatus for use in a wireless communication network, comprising:
a processor configured to:
determine a time interval for periodic time division duplex (TDD) Uplink/Downlink (UL/DL) reconfiguration;
generate a UL/DL reconfiguration command to indicate a dynamic TDD UL/DL configuration change; and
encode the UL/DL reconfiguration command in a physical downlink control channel (PDCCH) data; and

a radio frequency (RF) interface coupled to the processor and configured to cause the encoded UL/DL reconfiguration command to be transmitted in subframe 0 at the time interval.

2. The apparatus of claim 1 , wherein the time interval comprises at least one radio frame.

3. The apparatus of claim 1 , wherein the RF interface is further configured to repeat the transmitting of the encoded UL/DL reconfiguration command at the time interval to improve transmission reliability.

4. The apparatus of claim 1 , wherein the UL/DL reconfiguration command is transmitted in subframe 0 or 5.

5. The apparatus of claim 1 , wherein the UL/DL reconfiguration command comprises a configuration value that indicates a TDD UL/DL configuration change subsequent to the previous UL/DL reconfiguration command, wherein the processor is further configured to apply the TDD UL/DL configuration change in subframe 0.

6. The apparatus of claim 1 , wherein the UL/DL configuration change is associated with a secondary serving cell (SCell) that serves the first UE, wherein the PDCCH is associated with the SCell, wherein the PDCCH comprises a UE specific control portion that carries physical layer controls for a particular UE, and wherein the encoded UL/DL reconfiguration command is transmitted in the UE specific control portion of the PDCCH.

7. The apparatus of claim 1 , wherein the encoded UL/DL reconfiguration command is transmitted in the UE specific control portion of the PDCCH.

8. The apparatus of claim 1 , wherein the encoded UL/DL reconfiguration command is composed of 3-bits and transmitted without hybrid automatic repeat request (HARQ).

9. The apparatus of claim 1 , wherein the encoded UL/DL reconfiguration command is transmitted in the UE common control portion of the PDCCH without hybrid automatic repeat request (HARQ).

10. The apparatus of claim 1 , wherein the UL/DL reconfiguration command is transmitted in a downlink control information (DCI) message according to DCI Format 1C.

11. The apparatus of claim 1 , wherein the UL/DL reconfiguration command includes a TDD UL/DL reconfiguration window size.

12. An apparatus for use in a wireless communication network, comprising:
a processor configured to:
determine a time interval for periodic time division duplex (TDD) Uplink/Downlink (UL/DL) reconfiguration;
generate a UL/DL reconfiguration command to indicate a dynamic TDD UL/DL configuration change; and
encode the UL/DL reconfiguration command in a downlink control information (DCI) message according to DCI format 1C; and

a radio frequency (RF) interface coupled to the processor and configured to cause the encoded UL/DL reconfiguration command to be transmitted at the time interval.

13. The apparatus of claim 12 , wherein to encode the UL/DL reconfiguration command, the processor is further configured to:
generate a Cyclic Redundancy Check (CRC) for the DCI message; and
scramble the CRC by a TDD UL/DL configuration specific Radio Network Temporary Identifier (TDD-RNTI) value,
wherein the TDD-RNTI differentiates the UL/DL reconfiguration command from other control signals in the common control portion of the PDCCH.

14. The apparatus of claim 13 , wherein the scrambled CRC is appended to the DCI message.

15. The apparatus of claim 13 , wherein the configuration specific TDD-RNTI is not one of the group RA-RNTI, C-RNTI, Semi-Persistent Scheduling C-RNTI, Temporary C-RNTI, TPC-PUCCH-RNTI, TPC-PUSCH-RNTI, M-RNTI, P-RNTI and SI-RNTI.

16. The apparatus of claim 13 , wherein the UL/DL reconfiguration command is transmitted in subframe 0 or 5.

17. The apparatus of claim 12 , wherein the DCI message includes a TDD UL/DL reconfiguration window size.

18. The apparatus of claim 12 , wherein the time interval comprises at least one radio frame.

19. The apparatus of claim 12 , wherein the RF interface is further configured to repeat the transmitting of the encoded UL/DL reconfiguration command at the time interval to improve transmission reliability.

20. The apparatus of claim 12 , wherein the UL/DL reconfiguration command comprises a configuration value that indicates a TDD UL/DL configuration change subsequent to the previous UL/DL reconfiguration transmission, wherein the processor is further configured to apply the TDD UL/DL configuration change in subframe 0.

21. The apparatus of claim 12 , wherein the UL/DL configuration change is associated with a secondary serving cell (SCell) that serves the first UE, wherein the PDCCH is associated with the SCell, wherein the PDCCH comprises a UE specific control portion that carries physical layer controls for a particular UE, and wherein the encoded UL/DL reconfiguration command is transmitted in the UE specific control portion of the PDCCH.

22. The apparatus of claim 12 , wherein the encoded UL/DL reconfiguration command is transmitted in the UE specific control portion of the PDCCH.

23. The apparatus of claim 12 , wherein the encoded UL/DL reconfiguration command is transmitted without hybrid automatic repeat request (HARQ).

24. The apparatus of claim 12 , wherein the encoded UL/DL reconfiguration command is 3 bits long and is transmitted in the UE common control portion of the PDCCH without hybrid automatic repeat request (HARQ).

25. A method for signaling a dynamic time division duplex (TDD) Uplink/Downlink (UL/DL) allocation change in a wireless communication network, comprising:
determining a time interval for periodic TDD UL/DL reconfiguration windows;
generating a UL/DL reconfiguration command to indicate the dynamic TDD UL/DL reconfiguration change;
encoding the UL/DL reconfiguration command in a physical downlink control channel (PDCCH) data; and
transmitting the encoded UL/DL reconfiguration command in a first of the UL/DL reconfiguration windows via a PDCCH.

26. The method of claim 25 , wherein the time interval comprises at least one radio frame.

27. The method of claim 25 , wherein the RF interface is further configured to repeat the transmitting of the encoded UL/DL reconfiguration command at the time interval to improve transmission reliability.

28. The method of claim 25 , wherein the UL/DL reconfiguration command is transmitted in subframe 0 or 5.

29. The method of claim 25 , wherein the UL/DL reconfiguration command comprises a configuration value that indicates a TDD UL/DL configuration change subsequent to the previous UL/DL reconfiguration transmission, wherein the processor is further configured to apply the TDD UL/DL configuration change in subframe 0.

30. The method of claim 25 , wherein the UL/DL configuration change is associated with a secondary serving cell (SCell) that serves the first UE, wherein the PDCCH is associated with the SCell, wherein the PDCCH comprises a UE specific control portion that carries physical layer controls for a particular UE, and wherein the encoded UL/DL reconfiguration command is transmitted in the UE specific control portion

Assignees

• Texas Instruments Inc

Inventors

• Ekpenyong Anthony Edet

Classifications

• H04L5/0064

  Rate requirement of the data, e.g. scalable bandwidth, data priority · CPC title

• H04L5/1469 Primary

  using time-sharing · CPC title

• H04L5/001

  the frequencies being arranged in component carriers · CPC title

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04L5/0044

  Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH · CPC title