Dynamic signaling of the downlink and uplink subframe allocation for a TDD wireless communication system
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.
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 of the PDCCH.
31. The method of claim 25 , wherein the encoded UL/DL reconfiguration command is transmitted in the UE specific control portion of the PDCCH.
32. The method of claim 25 , wherein the encoded UL/DL reconfiguration command is composed of 3-bits and transmitted without hybrid automatic repeat request (HARQ).
33. The method of claim 25 , wherein the encoded UL/DL reconfiguration command is transmitted in the UE common control portion of the PDCCH without hybrid automatic repeat request (HARQ).
34. 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 downlink control information (DCI) message according to DCI Format 1C; and
transmitting the encoded UL/DL reconfiguration command in a first of the UL/DL reconfiguration windows via a PDCCH.
35. The method of claim 34 , wherein encoding the UL/DL reconfiguration command further comprises:
generating a Cyclic Redundancy Check (CRC) for the DCI message; and
scrambling 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.
36. The method of claim 35 , therein the scrambled CRC is appended to the DCI message.
37. The method of claim 35 , 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.
38. The method of claim 34 , wherein the DCI message includes a TDD UL/DL reconfiguration window size.
39. The method of claim 34 , wherein the time interval comprises at least one radio frame.
40. The method of claim 34 , 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.
41. The method of claim 34 , wherein the UL/DL reconfiguration command is transmitted in subframe 0 or 5.
42. The method of claim 34 , 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.
43. The method of claim 34 , 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.
44. The method of claim 34 , wherein the encoded UL/DL reconfiguration command is transmitted in the UE specific control portion of the PDCCH.
45. The method of claim 34 , wherein the encoded UL/DL reconfiguration command is a 3-bit field and transmitted without hybrid automatic repeat request (HARQ).
46. The method of claim 34 , wherein the encoded UL/DL reconfiguration command is transmitted in the UE common control portion of the PDCCH without hybrid automatic repeat request (HARQ).