Frame format and frame assembling/disassembling method for the frame format

• US 8,340,013 B2
• Filed: 06/22/2009
• Issued: 12/25/2012
• Est. Priority Date: 07/15/1997
• Status: Expired due to Fees

• Current Assignee: ViaSat Incorporated
• Original Assignee: ViaSat Incorporated
• Inventors: Agarwal, Anil K.
• Primary Examiner(s): PHAN, MAN U
• Application Number:
  US12/489,294
• Publication Number:
  US 20090268660A1
• Time in Patent Office: 1,282 Days
• Field of Search: 370222-235, 370316-349, 370436-465, 375222-225, 375260-286, 455 63- 69, 709217-229
• US Class Current: 370/315
• CPC Class Codes: H04B 7/1851 Systems using a satellite or space-based relay H04B7/18508, H04B7/18521 take precedence; providing specific services H04B7/18523 - H04B7/18576
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/0075 Transmission of coding parameters to receiver H04L1/0023 takes precedence
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control
• CPC Class Codes: H04L 12/5601 Transfer mode dependent, e.g. ATM
• CPC Class Codes: H04L 2012/5607 Radio
• CPC Class Codes: H04L 2012/5662 Macrocells or frames
• CPC Class Codes: H04L 2012/5665 Interaction of ATM with other protocols
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365

Abstract

A method of assembling a plurality of frames including cell/packet-formatted data according to a predetermined frame format for transmission in a communication signal in a wireless or satellite environment. The method begins by assembling a data payload for each frame having a first variable size, including at least one of a partial data cell/packet and a complete data cell/packet. Then, for each frame a block code having a second variable size is generated for use in error correction. Each frame is provided with a frame header which defines aspects of the frame. Finally, the data payload, the block code and the format header are combined to form a frame corresponding to the plurality of frames, the format header defining a first portion of the frame, the data payload defining a second portion of the frame and the block code defining a third portion of the frame.

Claims

1. A method for assembling a frame including packet-formatted data according to a predetermined frame format for transmission in a communication signal in a satellite system, the method comprising:

receiving, at a transmitting terminal, a measured link quality from a receiving terminal;

selecting a code rate to be used according to the measured link quality;

assembling a data payload for the frame having a first variable size, the first variable size adapted according to the selected code rate;

generating a block code used for error correction and having a second variable size, the second variable size adapted according to the selected code rate;

providing a frame header which defines aspects of the frame;

combining the data payload, the block code, and the frame header to form the frame;

transmitting the frame from the transmitting terminal directed to the receiving terminal via the satellite;

adaptively changing the selected code rate based on a change in the measured link quality;

identifying a changed first variable size responsive to the changed code rate; and

identifying a changed second variable size responsive to the changed code rate, wherein a size of the frame remains constant.

2. A gateway device for assembling a frame including packet-formatted data according to a predetermined frame format for transmission in a communication signal in a satellite system, the gateway device comprising:

a receiver configured to receive a measured link quality from a receiving terminal;

a selector, communicatively coupled with the receiver, and configured to select a code rate to be used according to the measured link quality;

an encoder, communicatively coupled with the selector, and configured to;

assemble a data payload for the frame having a first variable size, the first variable size adapted according to the selected code rate; and

generate a block code used for error correction and having a second variable size, the second variable size adapted according to the selected code rate;

a frame assembler, communicatively coupled with the encoder, and configured to;

provide a frame header which defines aspects of the frame;

combine the data payload, the block code and the format header to form a corresponding frame; and

a transmitter, communicatively coupled with the frame assembler, and configured to transmit the assembled frame to the receiving terminal,

wherein the selector is further configured to adaptively change the selected code rate based on a change in the measured link quality, and the encoder is further configured to identify a changed first variable size and a changed second variable size responsive to the changed code rate, wherein the changed first variable size and the changed second variable size are identified so that a size of the frame remains constant.

3. A device for assembling a frame including packet-formatted data according to a predetermined frame format for transmission in a communication signal in a satellite system, the device comprising:

means for receiving, at a transmitting terminal, a measured link quality from a receiving terminal comprising a destination for the frame;

means for selecting a code rate to be used according to the measured link quality;

means for assembling a data payload for the frame having a first variable size, the first variable size adapted according to the selected code rate;

means for generating a block code used for error correction and having a second variable size, the second variable size adapted according to the selected code rate;

means for providing a frame header which defines aspects of the frame;

means for combining the data payload, the block code, and the frame header to form a corresponding frame;

means for transmitting the assembled frame from the transmitting terminal to the receiving terminal;

means for adaptively changing the selected code rate based on an improvement in the measured link quality; and

means for identifying an increased first variable size and a decreased second variable size responsive to the changed code rate so a size of the frame size remains constant.

4. A satellite communications system for assembling and disassembling a frame including packet-formatted data according to a predetermined frame format, the system comprising:

a gateway terminal configured to;

receive a measured link quality from a receiving terminal;

select a code rate to be used according to the measured link quality;

assemble a data payload for the frame having a first variable size, the first variable size adapted according to the selected code rate;

generate a block code used for error correction and having a second variable size, the second variable size adapted according to the selected code rate;

provide a frame header which defines aspects of the frame;

combine the data payload, the block code, and the frame header to form the frame; and

transmit the frame in a wireless communications signal directed to the receiving terminal; and

a receiving terminal, in communication with the gateway terminal via satellite, and configured to;

receive the frame via the satellite;

decode the frame header to identify the selected code rate; and

decode the data payload using the block code and the selected code rate,

wherein the gateway terminal is further configured to;

adaptively change the selected code rate based on a change in the measured link quality transmitted from the receiving terminal via satellite; and

identify a changed first variable size and a changed second variable size responsive to the changed code rate so that a size of the frame remains constant.