Method and apparatus for managing device to device communication

1. A method for supporting a device-to-device (D2D) communication in a wireless network, the method performed between a first D2D device (D1) and a second D2D device (D2), the method comprising:

transmitting by the D2, a D2D communication not available message (DNAM) to the D1 during a period where the D1 and the D2 are available for active D2D communications therebetween and when the D2 identifies a need for a second communication with at least one of a base station or a different D2D device;

wherein the DNAM indicates that one or more of the D1 and the D2 are unavailable for active D2D communications therebetween;

transitioning, by the D1, upon receipt of the DNAM by the D1, to a listening mode for receiving at least a D2D communication available message (DAM) from the D2;

wherein the DAM indicates that the D1 and the D2 are available for active D2D communications therebetween, and

wherein the D2 is capable of performing both the D2D communication and cellular communication non-simultaneously.

2. The method of claim 1 , wherein during the listening mode, transmitting by the D2, a second DNAM upon the D2 identifying a need for a third communication.

3. The method of claim 2 , wherein transitioning to the listening mode includes:

transitioning, by the D1, to a power saving mode, wherein the D1 sleeps for at least one sleep period upon transition to the power saving mode.

4. The method of claim 2 , wherein the DNAM or the second DNAM indicates whether one or more of the second communication or a third communication has a known duration.

5. The method of claim 1 , wherein the DNAM is transmitted to one or more of a plurality of devices, wherein the plurality of devices includes at least the D1.

6. The method of claim 1 , wherein transitioning to the listening mode includes:

transitioning, by the D1, to a power saving mode, wherein the D1 sleeps for at least one sleep period upon transition to the power saving mode.

7. The method of claim 6 , wherein a duration of the sleep period is specified in one or more of the DNAM and the second DNAM.

8. The method of claim 6 , wherein upon expiry of the sleep period, the D1 listens for one or more of the second DNAM or the DAM for a receive mode period.

9. The method of claim 8 , wherein upon non-receipt of the DAM or the second DNAM before expiry of the receive mode period, transitioning, by the D1, to a short power saving mode, wherein the D1 sleeps for a short sleep period during the short power saving mode; and

upon expiry of the short sleep period, listening, by the D1, for one or more of the DAM and the second DNAM during a short wake up period.

10. The method of claim 1 , wherein the DNAM or the second DNAM indicates whether one or more of the second communication or a third communication has a known duration.

11. The method of claim 1 , wherein transitioning to the listening mode includes:

transitioning, by the D1, to a short power saving mode, wherein the D1 sleeps for a short sleep period during the short power saving mode; and

upon expiry of the short sleep period, listening, by the D1, for the DAM or the second DNAM during a short wake up period.

12. The method of 11 , wherein the short sleep period has a duration, the duration is one or more of: a preconfigured period, a period signalled by the D2 and a period calculated based on a known formula.

13. The method of 11 , wherein the short sleep period is signalled by the D2 within the DNAM.

14. The method of claim 1 further including:

upon the D1 receiving the DAM, transmitting, by the D1, a message to the D2.

15. An end node (EN) supporting device-to-device (D2D) communication in a wireless network comprising:

a network interface for receiving data from and transmitting data to network devices connected to the wireless network;

a processor; and

a machine readable memory storing machine executable instructions which when executed by the processor configure the EN to:

during a period where the EN and a D2D device are available for active D2D communications therebetween and when the D2D device identifies a need for a second communication with at least one of a base station or a different D2D device, receive a D2D communication not available message (DNAM) from the D2D device;

wherein the DNAM indicates that one or more of the EN and the D2D device are unavailable for active D2D communications therebetween;

transition to a listening mode for receiving at least a D2D communication available message (DAM) from the D2D device upon receipt of the DNAM by the EN;

wherein the DAM indicates that the EN and the D2D device are available for active D2D communications therebetween, and

wherein the D2D device is capable of performing both the D2D communication and cellular communication non-simultaneously.

16. A gateway (GW) supporting device-to-device (D2D) communication in a wireless network comprising:

a network interface for receiving data from and transmitting data to network devices connected to the wireless network;

a processor; and

a machine readable memory storing machine executable instructions which when executed by the processor configure the GW to:

during a period where the GW and a D2D device are available for active D2D communications therebetween and when the D2D device identifies a need for a second communication with at least one of a base station or a different D2D device, receive a D2D communication not available message (DNAM) from the D2D device;

wherein the DNAM indicates that one or more of the GW and the D2D device are unavailable for active D2D communications therebetween;

upon receipt of the DNAM by the GW, transition to a listening mode for receiving at least a D2D communication available message (DAM) from the D2D device;

wherein the DAM indicates that the GW and the D2D device are available for active D2D communications therebetween, and

wherein the D2D device is capable of performing both the D2D communication and cellular communication non-simultaneously.

17. A mesh node (MN) supporting device-to-device (D2D) communication in a wireless network comprising:

a network interface for receiving data from and transmitting data to network devices connected to the wireless network;

a processor; and

a machine readable memory storing machine executable instructions which when executed by the processor configure the MN to:

during a period where the MN and a D2D device are available for active D2D communications therebetween and when the D2D device identifies a need for a second communication with at least one of a base station or a different D2D device, receive a D2D communication not available message (DNAM) from the D2D device;

wherein the DNAM indicates that one or more of the MN and the D2D device are unavailable for active D2D communications therebetween;

upon receipt of the DNAM by the MN, transition to a listening mode for receiving at least a D2D communication available message (DAM) from the D2D device;

wherein the DAM indicates that the MN and the D2D device are available for active D2D communications therebetween, and

wherein the D2D device is capable of performing both the D2D communication and cellular communication non-simultaneously.