TDD reconfiguration with consideration of DTX/DRX

Patent metadata

Field	Value
Publication number	US-11337245-B2
Application number	US-201414654660-A
Country	US
Kind code	B2
Filing date	Jan 27, 2014
Priority date	Jan 29, 2013
Publication date	May 17, 2022
Grant date	May 17, 2022

Abstract

Methods, systems, and devices are described for discontinuous transmission and/or discontinuous reception in time division duplex (TDD) systems that may have data transmission formats dynamically reconfigured. An initial uplink-downlink (UL-DL) configuration for TDD communication between an eNB and user equipment (UE) may be established. This initial UL-DL configuration may be reconfigured to a different UL-DL configuration for one or more UEs in communication with the eNB. When a UE switches to discontinuous reception (DRX) mode, it may monitor control information from the eNB during DRX on periods, a frequency of the DRX on periods based on a reference UL-DL configuration irrespective of any reconfiguration of UL-DL configuration for a particular UE. In some aspects, a UE that is operating in a UL-DL reconfiguration mode may, upon entering DRX mode, autonomously discontinue operating in the UL-DL reconfiguration mode.

First claim

What is claimed is:

1. A method of wireless communication performed by a user equipment (UE) in time-division duplex (TDD) communication with a base station, comprising:
receiving, from the base station, a System Information Block (SIB) comprising a first uplink-downlink (UL-DL) configuration for TDD communication with the base station;
receiving, from the base station, a Radio Resource Control (RRC) message comprising a second UL-DL configuration for TDD communication with the base station;
receiving a reconfiguration message to change the first UL-DL configuration to the second UL-DL configuration;
switching to a discontinuous reception (DRX) mode;
monitoring control information from the base station during DRX on periods, wherein a frequency of the DRX on periods is based on a reference TDD UL-DL configuration, and wherein the frequency of the DRX on periods is irrespective of the second UL-DL configuration; and
changing back to the first UL-DL configuration while switched to the DRX mode, the first UL-DL configuration being an initial UL-DL configuration.

2. The method of claim 1 , further comprising:
switching out of the DRX mode; and
determining a new UL-DL configuration to be used for communications with the base station.

3. The method of claim 2 , wherein determining the new UL-DL configuration comprises:
receiving an indication to switch to a dynamic reconfiguration mode and a timing to initiate the switch from the base station; and
receiving the new UL-DL configuration for a subsequent radio frames.

4. The method of claim 3 , wherein the indication to switch to the dynamic reconfiguration mode and the timing to initiate the switch are received via one or more of Layer 1 (L1), Medium Access Control (MAC), or RRC signaling.

5. The method of claim 2 , wherein the switching out of the DRX mode comprises:
receiving control information from the base station during a DRX active period.

6. The method of claim 2 , wherein the switching out of the DRX mode comprises:
determining that data is to be sent to the base station; and
transmitting an indication to the base station that data is to be sent from the UE.

7. The method of claim 1 , wherein the reference TDD UL-DL configuration is the first UL-DL configuration, the first UL-DL configuration being an initial UL-DL configuration.

8. The method of claim 7 , wherein the initial UL-DL configuration is received in a SIB Type1.

9. The method of claim 1 , wherein the reference TDD UL-DL configuration is different than the first UL-DL configuration, the first UL-DL configuration being an initial UL-DL configuration.

10. The method of claim 9 , wherein the reference TDD UL-DL configuration is received in a RRC message to the UE.

11. A wireless communication user equipment (UE) apparatus configured to operate using one of multiple time-division duplex (TDD) uplink-downlink (UL-DL) configurations, comprising:
means for receiving, from a base station, a System Information Block (SIB) comprising a first uplink-downlink (UL-DL) configuration for TDD communication with the base station;
means for receiving, from the base station, a Radio Resource Control (RRC) message comprising a second UL-DL configuration for TDD communication with the base station;
means for receiving a reconfiguration message to change the first UL-DL configuration to the second UL-DL configuration;
means for switching to a discontinuous reception (DRX) mode;
means for monitoring control information from the base station during DRX on periods, wherein a frequency of the DRX on periods is based on a reference TDD UL-DL configuration, and wherein the frequency of the DRX on periods is irrespective of the second UL-DL configuration; and
means for changing back to the first UL-DL configuration while switched to the DRX mode, the first UL-DL configuration being an initial UL-DL configuration.

12. The apparatus of claim 11 , further comprising:
means for switching out of the DRX mode; and
means for determining a new UL-DL configuration to be used for communications with the base station.

13. The apparatus of claim 12 , wherein the means for determining the new UL-DL configuration comprises:
means for receiving an indication to switch to a dynamic reconfiguration mode and a timing to initiate the switch from the base station; and
means for receiving the new UL-DL configuration for a subsequent radio frame.

14. The apparatus of claim 13 , wherein the indication to switch to the dynamic reconfiguration mode and the timing to initiate the switch are received via one or more of Layer 1 (L1), Medium Access Control (MAC), or RRC signaling.

15. The apparatus of claim 12 , wherein the means for switching out of the DRX mode comprises:
means for receiving control information from the base station during a DRX active period.

16. The apparatus of claim 12 , wherein the means for switching out of the DRX mode comprises:
means for determining that data is to be sent to the base station; and
means for transmitting an indication to the base station that data is to be sent from the UE.

17. A wireless communication user equipment (UE) apparatus configured to operate using one of multiple time-division duplex (TDD) uplink-downlink (UL-DL) configurations, comprising:
at least one processor; and
memory coupled to the at least one processor, the memory storing instructions executable by the at least one processor to cause the UE to:
receive, from a base station, a System Information Block (SIB) comprising a first uplink-downlink (UL-DL) configuration for TDD communication with the base station;
receive, from the base station, a Radio Resource Control (RRC) message comprising a second UL-DL configuration for TDD communication with the base station;
receive a reconfiguration message to change the first UL-DL configuration to the second UL-DL configuration;
switch to a discontinuous reception (DRX) mode; and
monitor control information from the base station during DRX on periods, wherein a frequency of the DRX on periods is based on a reference TDD UL-DL configuration, wherein the frequency of the DRX on periods is irrespective of the second UL-DL configuration; and
change back to the first UL-DL configuration while switched to the DRX mode, the first UL-DL configuration being an initial UL-DL configuration
and memory coupled to the at least one processor.

18. The apparatus of claim 17 , wherein the instructions executable by the at least one processor to cause the UE to:
switch out of the DRX mode; and
determine a new UL-DL configuration to be used for communications with the base station.

19. The apparatus of claim 18 , wherein the determine the new UL-DL configuration comprises:
receive an indication to switch to a dynamic reconfiguration mode and a timing to initiate the switch from the base station; and
receive the new UL-DL configuration for a subsequent radio frame.

20. The apparatus of claim 19 , wherein the indication to switch to the dynamic reconfiguration mode and the timing to initiate the switch are received via one or more of Layer 1 (L1), Medium Access Control (MAC), or RRC signaling.

21. The apparatus of claim 18 , wherein the switch out of the DRX mode comprises:
receive control information from the base station during a DRX active period.

22. The apparatus of claim 18 , wherein the switch out of the DRX mode comprises:
determine that data is to be sent to the base station; and
transmit an indication to the base s

Assignees

• Qualcomm Inc
• Wei Chao
• Zhu Xipeng
• Hou Jilei
• Wang Neng

Inventors

• Wei Chao
• Zhu Xipeng
• Hou Jilei
• Wang Neng

Classifications

• H04W52/02

  Power saving arrangements · CPC title

• H04W52/0216 Primary

  using a pre-established activity schedule, e.g. traffic indication frame · CPC title

• Y02D30/70

  in wireless communication networks · CPC title

• H04W52/0235 Primary

  where the received signal is a power saving command · CPC title

• H04W76/28

  Discontinuous transmission [DTX]; Discontinuous reception [DRX] · CPC title