Patent ID: 8681618

Claim:
A packet retransmission control system, comprising: a network control block configured to perform packet retransmission control in an upper layer; and a packet retransmission control block configured to perform packet retransmission control with a shorter retransmission timeout than said upper layer in a lower layer that is lower than said upper layer, wherein, if said network control block receives a duplicate acknowledge packet comprising an acknowledge packet notifying a same sequence number for a predetermined number of times, said network control block performs packet retransmission, wherein said packet retransmission control block determines whether or not retransmission of a same packet is performed earlier in said upper layer than in said lower layer, and wherein, if said retransmission of said same packet is performed earlier in said upper layer than in said lower layer, said packet retransmission control block prohibits retransmission of said same packet in said lower layer.