Patent ID: 6948110
Filing Date: 2005-09-20
Classification: H03M,H04L

Abstract:
1. A transmission data loss detection method in a data transmission system in which a sending unit deblocks parent data into pieces of unit data and sends each piece of unit data in sequence, and a receiving unit blocks each piece of received unit data to reconstruct the parent data, comprising the steps of; calculating an ECC for a data sequence having an ID added corresponding to each piece of unit data in the sending unit; sending send data having each piece of unit data with the added ECC; returning each ID to the corresponding expected ID and resending from the unit data corresponding to the expected ID in case of receiving a resend request including an expected ID from the receiving unit; receiving the send data as receive data and calculating the expected ECC for the data sequence having an expected ID added corresponding to each piece of unit data in the receive data in the receiving unit; comparing the ECC in the receive data and the expected ECC; issuing the resend request including the expected ID to the sending unit in the case where the ECC in the receive data and the expected ECC are not the same; and blocking the corresponding unit data in the case where the ECC in the receive data and the expected ECC are the same.