TIMING SYNCHRONIZATION APPARATUS, METHOD AND SYSTEM IN DEVICE TO DEVICE SYSTEM

The present invention discloses a method, an apparatus, and a system for timing synchronization in an inter-terminal direct communication system. The method for timing synchronization includes a step in which a master node that controls timing synchronization of the system acquires synchronization signal reception time information reflecting relationship with an adjacent terminal through inter-terminal synchronization signal exchange from every sub-node on the system; and a step in which the master node transmits transmission time adjustment information relating to adjustment of transmission time of each sub-node to each sub-node by allowing for inter-link delay spread based on the synchronization signal reception time information of each sub-node. Accordingly, a synchronization process that is performed under control of a base station or a single master terminal is allowed for, and thus the master node-based timing synchronization method allows each terminal to decrease a protection section assignment additionally required due to time delay. Therefore, resources for inter-terminal direct communication can be efficiently used.