US Patent No. 9,826,567

D2D SWITCHOVER METHOD, SYSTEM, AND DEVICE


Patent No. 9,826,567
Issue Date November 21, 2017
Title D2d Switchover Method, System, And Device
Inventorship Ying Peng, Beijing (CN)
Qiubin Gao, Beijing (CN)
Wenhong Chen, Beijing (CN)
Rui Zhao, Beijing (CN)
Assignee CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY, Beijing (CN)

Claim of US Patent No. 9,826,567

1. A Device-to-Device, D2D, switching method, comprising:
determining, by a network-side device according to one or combination of resource management information and channel state
information, whether a D2D user equipment needs to be D2D-switched; and

triggering, by the network-side device, the D2D user equipment to be switched to a different system for device-to-device communication,
or to perform device-to-device communication through the network-side device, or to perform device-to-device communication
in a present system without being controlled by the network-side device, upon determining that the D2D user equipment needs
to be D2D-switched;

wherein determining, by the network-side device from the resource management information, whether the D2D user equipment needs
to be D2D-switched comprises:

determining, by the network-side device, the D2D user equipment needs to be D2D-switched, upon determining that a D2D switching
condition is satisfied, or determining, by the network-side device, whether the D2D user equipment needs to be D2D-switched
according to one or combination of a priority of service of the D2D user equipment and a type of service resource for D2D
communication;

wherein the D2D switching condition comprises one or a combination of following conditions:
an interference value or an interference average value to which a user equipment in non-device-to-device communication is
actually subjected when other user equipments are in device-to-device communication is more than a first threshold;

an interference value or an interference average value to which a user equipment in non-device-to-device communication is
estimated to be subjected when other user equipments are in device-to-device communication is more than a second threshold;

an interference value or an interference average value to which the D2D user equipment is actually subjected in device-to-device
communication is more than a third threshold;

an interference value or an interference average value to which the D2D user equipment is estimated to be subjected in device-to-device
communication is more than a fourth threshold;

the ratio of a network resource to be occupied by the D2D user equipment needing device-to-device communication to total network
resources is more than a fifth threshold;

the ratio of a network resource occupied by the D2D user equipment in device-to-device communication to total network resources
is more than a sixth threshold;

power of a signal, received by the D2D user equipment, transmitted by the network side is lower than an eighth threshold,
or higher than a ninth threshold, or lower than the eighth threshold and higher than the ninth threshold; and

switching of the D2D user equipment is allowed to be admitted in the different system;
wherein if the D2D user equipment needs to be in device-to-device communication, then the interference value to the D2D user
equipment is total power received over a resource for D2D communication in a network configured or predefined time window,
and the interference average value is a power average value over a unit of resource for D2D communication in the network configured
or predefined time window; and

if the D2D user equipment is in device-to-device communication, then the interference value to the D2D user equipment is a
signal to interference and noise ratio in device-to-device communication of the D2D user equipment, and the interference average
value is a quantified parameter related to a signal to interference and noise ratio in device-to-device communication of the
D2D user equipment.