Method and apparatus for LDPC transmission over a channel bonded link
A particular overall architecture for transmission over a bonded channel system consisting of two interconnected MoCA (Multimedia over Coax Alliance) 2.0 SoCs (Systems on a Chip) and a method and apparatus for the case of a “bonded” channel network. With a bonded channel network, the data is divided into two segments, the first of which is transported over a primary channel and the second of which is transported over a secondary channel.
1. A method for transmitting information over a home network using two dissimilar channels, comprising:
determining that a node has an aggregated packet data unit (A-PDU) to be transmitted, the A-PDU having M bytes;
calculating a ratio of the payload that can be carried by a first channel with respect to a second channel based on:
how many bits per OFDM symbol are used for the first channel and how many bits per OFDM symbol are used for the second channel;
maximum LDPC codeword payload sizes for each channel; and
maximum number of payload bits per OFDM symbol for each channel; and
dividing the M bytes between the first and second channel based on the calculated ratio;
determining the sum of any bonded channel frame splitting overhead and the M bytes and multiplying the sum by the calculated ratio to determine the number of bytes to be transmitted on the first each channel; and
subtracting a header and if the difference after subtracting the header is not evenly divisible by 4, then adding as many bytes as needed to increase the total number of bytes to be transmitted on the first channel to a number that is evenly divisible by 4, but not exceeding M.
2. The method of claim 1 , further including calculating a set of optimized forward error correction parameters.
3. The method of claim 2 , further including having a number of FEC padding bytes included in the total number of bytes to be transmitted as part of a reservation request.
4. The method of claim 2 , wherein calculating the set of optimized forward error correct parameters includes computing the number of information bytes, Imax that can be transported in the first channel and the second channel.