UE Wake-up Ahead of Paging Occasions to Retrieve Paging Configuration Information when in (Long) DRX

• US 20150173039A1
• Filed: 04/05/2012
• Published: 06/18/2015
• Est. Priority Date: 04/05/2012
• Status: Active Grant

• Current Assignee: Optis Cellular Technology LLC (Brevet Capital)
• Original Assignee: Optis Cellular Technology LLC (Brevet Capital)
• Inventors: Rune, Johan, Eriksson, Erik, Sachs, Joachim
• Granted Patent: US 9,521,650 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 52/0232 according to average transmission signal activity
• CPC Class Codes: H04W 68/02 Arrangements for increasing efficiency of notification or paging channel
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

In transmission of paging information from a mobile network to a terminal device (200), the terminal device applies a discontinuous reception cycle to enter a sleep mode. Further, the terminal device determines an advance wakeup time (AW) for leaving the sleep mode. The advance wakeup time (AW) is advanced by an advancement time interval (ΔA) with respect to a start of an active time of the discontinuous reception cycle. At the determined advance wakeup time (AW), the terminal device leaves the sleep mode and starts monitoring the downlink control channel with respect to paging configuration information transmitted by the mobile network. The paging configuration information defines a paging occasion for transmission of the paging information. On the basis of the paging configuration information, the terminal device monitors the paging occasion to receive the paging information from the mobile network.

Claims

1. A method for transmission of paging information from a mobile network to a terminal device, the method comprising:

according to a discontinuous reception cycle, the terminal device entering a sleep mode in which the terminal device is not monitoring a downlink control channel transmitted by the mobile network;

the terminal device determining an advance wakeup time for leaving the sleep mode, said advance wakeup time being advanced by an advancement time interval with respect to a start of an active time of the discontinuous reception cycle;

at the determined advance wakeup time, the terminal device leaving the sleep mode and starting monitoring the downlink control channel with respect to paging configuration information from the mobile network, the paging configuration information defining a paging occasion for the transmission of the paging information; and

on the basis of the paging configuration information, the terminal device monitoring the paging occasion to receive the paging information from the mobile network.

2. The method according to claim 1, comprising:

after monitoring the downlink control channel, the terminal device re-entering the sleep mode; and

at the start of the active time of the discontinuous reception cycle, the terminal device leaving the sleep mode to monitor the paging occasion.

3. The method according to claim 1, comprising:

the terminal device maintaining historical data relating to past changes of the paging configuration information; and

the terminal device determining the advancement time interval on the basis of the historical data.

4. The method according to claim 1, comprising:

the terminal device determining the advancement time interval on the basis of a length of a sleep period between entering the sleep mode and the start of the active time of the discontinuous reception cycle.

5. The method according to claim 1, comprising:

the terminal device determining at least one probability value; and

the terminal device determining the advancement time interval on the basis of the at least one determined probability value.

6. The method according to claim 5, comprising:

wherein the at least one probability value represents a probability of the paging configuration information having changed while the terminal device was in the sleep mode.

7. The method according to claim 5,

wherein the at least one probability value represents a probability of the terminal device having moved to another cell of the mobile network while the terminal device was in the sleep mode.

8. The method according to claim 5,

wherein the at least one probability value represents a probability of the terminal device failing to monitor the paging occasion.

9. The method according to claim 5,

wherein the terminal device receives the at least one probability value from the mobile network.

10. The method according to claim 1, comprising:

the terminal device determining the advancement time interval on the basis of a number of reception steps required by the terminal device to receive the paging configuration information.

11. The method according to claim 1, comprising:

the terminal device indicating the advancement time interval to the mobile network.

12. The method according to claim 1, comprising:

the terminal device receiving an indication of the advancement time interval from mobile network.

13. The method according to claim 1, comprising:

the terminal device receiving the paging information before the start of the active period of the discontinuous reception cycle.

14. The method according to claim 1, comprising:

the terminal device detecting a failure in monitoring the paging occasion; and

the terminal device indicating the failure to the mobile network.

30. The terminal device according to claim 29,

wherein the processor controls the terminal device to operate in accordance with the method of any one of claims 1 to 14.

15. A method for transmission of paging information from a mobile network to a terminal device configured to enter, according to a discontinuous reception cycle, a sleep mode in which the terminal device is not monitoring a downlink control channel transmitted by the mobile network, the method comprising:

the network node determining an advancement time interval defining an advance wakeup time for the terminal device leaving the sleep mode, said advance wakeup time being advanced by the advancement time interval with respect to a start of an active time of the discontinuous reception cycle; and

the network node controlling the transmission of the paging information on the basis of the determined advancement time interval.

16. The method according to claim 15, comprising:

the network node maintaining historical data relating to past changes of the paging configuration information; and

the network node determining the advancement time interval on the basis of the historical data.

17. The method according to claim 15, comprising:

the network node determining the advancement time interval on the basis of a length of a sleep period between entering the sleep mode and start of the active time of the discontinuous reception cycle.

18. The method according to claim 15, comprising:

the network node determining at least one probability value; and

the network node determining the advancement time interval on the basis of the at least one determined probability value.

19. The method according to claim 18, comprising:

wherein the at least one probability value represents a probability of the paging configuration information having changed while the terminal device was in the sleep mode.

20. The method according to claim 18,

wherein the at least one probability value represents a probability of the terminal device having moved to another cell of the mobile network while the terminal device was in the sleep mode.

21. The method according to claim 18,

wherein the at least one probability value represents a probability of the terminal device failing to monitor the paging occasion.

22. The method according to claim 15, comprising:

the network node determining the advancement time interval on the basis of a number of reception steps required by the terminal device to retrieve the paging configuration information.

23. The method according to claim 15, comprising:

the network node indicating the advancement time interval to the terminal device.

24. The method according to claim 15, comprising:

the network node indicating the at least one probability value to the terminal device.

25. The method according to claim 15, comprising:

the network node receiving an indication of the advancement time interval from the terminal device; and

the network node (100) determining the advance wakeup time on the basis of the received indication of the advancement time interval.

26. The method according to claim 15, comprising:

the network node determining paging configuration information defining a paging occasion for sending the paging information to the terminal device; and

after the advance wakeup time and before the start of the active time of the discontinuous reception cycle, the network node sending the paging configuration information to the terminal device.

27. The method according to claim 15, comprising:

after the advance wakeup time and before the start of the active time of the discontinuous reception cycle, the network node sending the paging information to the terminal device.

28. The method according to claim 15, comprising:

the network node receiving, from the terminal device, an indication of a failure in monitoring the paging occasion by the terminal device; and

if paging information was sent at the paging occasion, the network node sending a retransmission of the paging information.

32. The network node according to claim 31,

wherein the processor is configured to control the network node to operate in accordance with a method as defined by any one of claims 15 to 28.

29. A terminal device, comprising:

a radio interface for data transmission between a mobile network and the terminal device; and

a processor configured to;

control the terminal device to enter, according to a discontinuous reception cycle, a sleep mode in which the terminal device is not monitoring a downlink control channel transmitted by the mobile network,

determine an advance wakeup time for leaving the sleep mode, said advance wakeup time being advanced by an advancement time interval with respect to a start of an active time according to the discontinuous reception cycle,

control the terminal device to leave the sleep mode at the determined advance wakeup time and start monitoring the downlink control channel with respect to paging configuration information from the mobile network, the paging configuration information defining a paging occasion for the transmission of the paging information, and

on the basis of the paging configuration information, control the terminal device to monitor the paging occasion to receive the paging information.

31. A network node, comprising:

an interface for controlling data transmission between a mobile network and a terminal device configured to enter, according to a discontinuous reception cycle, a sleep mode in which the terminal device is not monitoring a downlink control channel transmitted by the mobile network; and

a processor (150;

350) configured to;

determine an advancement time interval defining an advance wakeup time for the terminal device leaving the sleep mode, said advance wakeup time being advanced by the advancement time interval with respect to a start of an active time of the discontinuous reception cycle; and

control the transmission of the paging information on the basis of the determined advancement time interval.