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Multiplexer-related

Method-and-apparatus-for-packet-transmission-with-header-compression

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Details

Inventors: Yoshimura, Takeshi; Kawahara, Toshiro; Suzuki, Takashi;
Assignee: NTT Mobile Communications Network (JP)
Primary Examiner: Luther; William
Assistant Examiner:
Attorney, Agent or Firm: Brinks Hofer Gilson & Lione

A sender converts a non-compressed packet, which is to be transmitted, into a full-header packet including a full header or a header-compressed packet including a compressed header, and sends the converted packet to a receiver. The receiver receives the packet transmitted from the sender, and converts the received packet into a decompressed packet. In cases the full-header packet or header-compressed packet is lost between the sender and receiver, the receiver keeps header-compressed packers received during an interval from the packet loss to the next earliest reception of a full-header packet, and decompresses the compressed headers of the kept header-compressed packets on the basis of contents of the full header of the full-header packet.

DETAILED DESCRIPTION The present invention has been made in view of the foregoing circumstances.
An object of the present invention is to provide a packet transmitting method, a relaying device and a data terminal capable of effectively reducing the number of packets to be discarded due to the loss of a certain packet, even if headers of packets to be transmitted and received are compressed.
According to one aspect of the present invention, an object of the present invention is achieved by a packet transmitting method comprising the steps of a packet transmission by a communication apparatus provided on a transmission node in a network, the packet transmission including an operation for converting a plurality of non-compressed packets to be transmitted into either a full-header packet with a full header or a header-compressed packet with a compressed header and transmitting a converted packet to a receiver node in the network; and a packet reception by a communication apparatus provided on the receiver node, the packet reception including an operation for receiving the full-header packet or the header-compressed packet transmitted from the sender and an conversion for converting a received packet to a decompression packet, the conversion including an operation for keeping, in cases a full-header packet or header-compressed packet is lost during transmission from the sender node to the receiver-node, at least one header-compressed packets received during a period between an occurrence of a packet loss and a reception of a next full-header packet, and an operation for decompressing a compressed header of the header-compressed packets thus kept, based on a content of a full header of the full-header packet received after the packet loss.
In the method, header-compressed packets received until the earliest reception of a full-header packet after the loss of a packet are kept, and the compressed headers of the header-compressed packets thus kept are decompressed based on the contents of the full-header packet

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