Patent ID: 6959410
Filing Date: 2005-10-25
Classification: H04L

Abstract:
1. A header decompression apparatus for decompressing a compressed header of a packet for transmission by referring to reference information being the same as reference information referred to for header compression by a transmitting side, said apparatus comprising: a packet receiver operable to receive the packet from the transmitting side; a reference information manager operable to store and manage the reference information; a header decompressor, operable to carry out header decompression on the received packet by referring to the reference information stored in said reference information manager; an error detector operable to detect an error in the packet including the decompressed header; a counter/storage the number operable to count the number of errors detected by said error detector and to store a relationship between the number of error packets and the number of error free packets; and an update request unit operable to transmit, to the transmitting side, and update request for requesting update information for updating the reference information, when determining, based on the relationship of the packet number stored by said counter/storage, that the reference information stored in said reference information manager should be updated, wherein when the update information is transmitted from the transmitting side, said reference information manager updates the reference information stored in said reference information manager based on the transmitted update information.