Patent ID: 9554406
Date: 2017-01-24
CPC Classifications: H04W

Claim:
1. A method of device to device (D2D) communication, adapted for a control node to arrange D2D communication between a first device and a second device, wherein the first device undergoes a handover procedure to the control node while having a non-D2D communication with the second device, and the method comprising: receiving, by the control node, from the first device having the non-D2D communication with the second device a first callee identification (ID) during the first device being handed over to the control node from another control node, wherein the control node receives the first callee ID in a handover request message from the another control node, and the first callee ID is an ID for the D2D communication between the first device and the second device, wherein the control node receives a first measurement report in response to transmit a first measurement configuration to the second device, and the another control node also receives a second measurement report transmitted by the first device in response to transmit a second measurement configuration to the first device, wherein the first callee ID is embedded in the second measurement report, both of the first measurement report and second measurement report indicate a quality of a channel between the first device and the second device, wherein the first measurement report and second measurement report are shared by the control node and the another control node; searching, by the control node, for the second device having a second callee ID in response to receiving from the first device the first callee ID; and arranging, by the control node, for the D2D communication between the first device and the second device when a first condition is fulfilled, wherein the first condition comprises the D2D communication between the first device and the second device is triggerable, and the step of arranging for the D2D communication between the first device and the second device when the first condition is fulfilled is executed before the procedure of handover the first device to the control node is complete, wherein whether the first condition is fulfilled comprises the criteria of the first device and the second device are within transmission ranges of each other and the quality of the channel between the first device and the second device is adequate, and wherein when the first condition is not fulfilled or when the first condition is no longer fulfilled, arranging, by the control node, the first device and the second device for the non-D2D communication.