SYSTEMS, METHODS AND DEVICES FOR CONNECTION "DEVICE-DEVICE" RESOURCES SYNCHRONIZATION AND ALLOCATION Russian patent published in 2017 - IPC H04W56/00 

FIELD: radio engineering, communication.

SUBSTANCE: user equipment (UE) is configured to synchronize with the independent synchronization source (I-SS), based on the first synchronization signal received from the I-SS. The UE is configured to determine whether the signal level, received from the I-SS is below the threshold value. The UE is configured, in response to determining that the I-SS is below the threshold, to transmit the second synchronization signal, propagating the synchronization information, received from the I-SS to one or more peer UE outside the I-SS coverage area. The second synchronization signal contains the device-device synchronization signal (D2DSS).

EFFECT: improvement of the public security VoIP services quality in the coverage scenarios outside the network or in scenarios with the partial network coverage.

19 cl, 16 dwg