Communication method and communication equipment

• US 6,084,888 A
• Filed: 03/02/1998
• Issued: 07/04/2000
• Est. Priority Date: 03/05/1997
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Watanabe, Kouji, Ishifuji, Tomoaki
• Primary Examiner(s): Nguyen, Chua
• Assistant Examiner(s): NGUYEN, PHUONGCHAU BA
• Application Number:
  US09/034,018
• Time in Patent Office: 855 Days
• Field of Search: 370/331, 370/349, 370/395, 370/471, 370/473, 370/474, 370/476, 370/394, 370/477, 370/389, 370/242, 370/336, 370/522, 370/535, 371/37.01, 371/37.7
• US Class Current: 370/473
• CPC Class Codes: H04L 2012/5627 Fault tolerance and recovery
• CPC Class Codes: H04L 2012/5662 Macrocells or frames
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

An object of the present invention is to improve transmission efficiency of a communication system for forming a transmission frame from a plurality of packets to perform communications using the transmission frame and reduce transmission power required to maintain an error rate. Headers of the plurality of packets are coupled to each other with redundancy information deleted therefrom so as to form a header part of the transmission frame. Further, payloads of the plurality of packets are coupled to each other so as to form a payload part of the transmission frame. A forward error correction code used for the header part and a forward error correction code used for the payload part are respectively attached to the transmission frame in isolation.

Claims

1. A communication method suitable for use in a communication system comprising a base station for transmitting data therefrom and receiving data therein through the use of a plurality of packets each having a header including destination information and a payload storing the data therein, and a terminal station for communicating with said base station through a communication channel, comprising the steps of:

multiplexing a plurality of input packets into a transmission frame and transmitting the transmission frame; and

outputting the plurality of packets restored from the received transmission frame;

said transmission frame including a preamble, a frame header part, a frame header part error correction code, a frame payload part and a frame payload part error correction code, said frame header part being formed from respective headers of said plurality of packets, and said frame payload part being formed from respective payloads of said plurality of packets.

2. A communication method according to claim 1, wherein said frame header part comprises a destination and information inherent in packets, said information being extracted from the respective headers of said plurality of packets.

3. A communication method according to claim 1, wherein said frame header part error correction code comprises an error correction code stronger than said frame payload part error correction code in error correction force.

4. A communication method according to claim 1, wherein the number n (integers of n≧

1) of the packets constituting the transmission frame, a byte number t_H of the error correction code added to said frame header part and a byte number tp of the error correction code added to said frame payload part are selected so as to minimize transmission power required for transmission of said transmission frame.

5. A communication method according to claim 2, wherein said each packet is an ATM (Asynchronous Transfer Mode) cell.

6. Communication equipment suitable for use in a communication network for transmitting a plurality of packets each having a header including destination information and a payload storing data therein, comprising:

a transmitting interface for multiplexing the plurality of packets so as to generate a transmission frame; and

a receiving interface for restoring the original plural packets from the transmission frame with the multiplexed plural packets;

said transmitting interface including,

a header analyzing part for analyzing the header of said each packet;

a data coupling part for coupling the headers of the packets to each other to thereby generate a frame header part and coupling the payloads corresponding to the headers to each other to thereby generate a frame payload part;

an error correction addition part for adding an error correction code to the frame header part and adding an error correction code to the frame payload part; and

a preamble addition part for providing a preamble; and

said receiving interface including, an error correction circuit for performing an error correction based on the error correction code added to the frame header part and an error correction based on the error correction code added to the frame payload part; and

a packet reconstruction part for taking out headers and their corresponding payloads divided into the frame header part and the frame payload part to thereby reconstruct the packets.

7. Communication equipment according to claim 6, wherein said transmitting interface further includes an elimination part of header redundancy information for eliminating redundancy information of each header,

said data coupling part couples the redundancy information-free headers to each other to thereby generate a frame header part, and

said packet reconstruction part further provides redundancy information to thereby reconstruct the packets.

8. Communication equipment according to claim 7, further including a receiving packet interface for checking error correction control applied to a header of a received packet, and a transmitting packet interface for applying error correction control to the headers of said restored packets.

9. Communication equipment according to claim 6, wherein the error correction code added to the frame header part consists of an error correction code stronger than that added to the frame payload part in error correction force.

10. Communication equipment according to claim 6, wherein the number n (integers of n≧

1) of the packets multiplexed into the transmission frame, a byte number t_H of the error correction code added to the frame header part and a byte number tp of the error correction code added to the frame payload part are selected so as to minimize transmission power required to transmit the transmission frame.

11. Communication equipment according to claim 7, wherein said communication network is an ATM (Asynchronous Transfer Mode) network.