Method for long term evolution device to device (LTED2D) communication working on ISM frequency band

The present invention discloses a working LTED2D ISM band communication method comprises: when a LTED2D transmitter sends a packet to the receiver can not LTED2D a pre-specified time-frequency resource blocks received correctly the receiver feedback LTED2D when the ACK / NACK signal, the transmitter continuously transmits LTED2D SREI LTED2D indication to the receiver; the receiver LTED2D claim SREI indication comprises the retransmission of ACK / NACK signal transmitter LTED2D not correctly received. The operation of the present invention is a communication method in LTED2D ISM band D2D communication designed to increase the transmission efficiency of ACK / NACK signaling procedure, this signaling process is applied to work LTED2D communication in the ISM band, by periodically transmitting SREI indication, so LTED2D transmitter may avoid unnecessary retransmission of packet data in high probability, so as to improve spectrum utilization D2D communication.