Method for controlling the sleep mode on a mobile terminal, corresponding mobile terminal, and corresponding radio access node

1. Method for controlling sleep mode in a terminal comprising at least two wireless interfaces to different wireless networks, said method comprising the steps of:

powering off one of the two wireless interfaces;

activating said powered off wireless interface for a predefined time window upon reception of a predefined signaling message via a radio channel on said other wireless interface, the predefined signaling message indicating that data is to be sent to the wireless interface to be activated.

2. Method according to claim 1 , wherein said terminal is a dual mode terminal comprising an ad-hoc interface and a cellular network interface.

3. Method according to claim 1 , wherein said terminal is a multimode terminal having two ad-hoc interfaces of different type.

4. Method according to claim 2 , wherein said cellular interface is switched off and activated upon reception of a signaling message over said ad-hoc interface.

5. Method according to claim 2 or 3 , wherein said ad-hoc interface belong to the group of Bluetooth interface, WLAN interface.

6. Method according to claim 2 , wherein said predefined signaling message is part of the cellular network radio resource control protocol sent on cellular signaling channels channel.

7. Method according to claim 2 , wherein said ad-hoc interface is switched off and activated upon reception of a signaling message over said cellular interface.

8. The method according to claim 1 , the method further comprising the step of:

monitoring at the non switched off interface for a predefined signaling message indicating that the switched off interface should wake up.

9. The method according to claim 1 , wherein the interface to be switched off is determined according to traffic measurement on the two interfaces.

10. The method according to claim 1 , wherein the interface on which there is less traffic is switched off.

11. The method according to claim 1 , wherein a time duration for the predefined time window is predetermined as a system parameter.

12. The method according to claim 1 , wherein a time duration for the predefined time window is sent over signaling.

13. Access network node of a cellular communication network comprising means for sending a predefined signaling message via a radio channel to a dual mode terminal comprising a cellular network interface and an ad-hoc wireless interface, said message comprising an indication to activate said ad-hoc wireless interface for a predefined time window if said ad-hoc wireless interface is currently powered off and if data is to be sent to said ad-hoc wireless interface to be activated.

14. Dual mode terminal comprising at least two wireless interfaces to different wireless networks, said terminal comprising means for controlling sleep mode on at least one of said two wireless interfaces, said dual mode terminal being wherein further comprises:

means for powering off one of the two wireless interfaces;

means for activating said powered off wireless interface for a predefined time window upon reception of a predefined signaling message via a radio channel on the other wireless interface indicating that data is to be sent to the wireless interface to be activated.

15. Access network node of a cellular communication network comprising means for sending a predefined signaling message to a dual mode terminal via a radio channel comprising a cellular network interface and an ad-hoc wireless interface, said message comprising an indication to activate said cellular air interface for a predefined time window if said cellular interface is currently powered off and if data is to be sent to said cellular interface to be activated.