Original Question: Maximum payload in AD6LoWPAN? by NagarjunaG
What is the maximum payload length the AD6LoWPAN data packet can carry?
What is the size of the data packet being transmitted by the Node to the Border Router?
Verified Answer: RE: Maximum payload in AD6LoWPAN? by NagarjunaG
The maximum application payload in the AD6LoWPAN node depends on the header compression (HC).
- Without Header Compression, the maximum payload length = 323 bytes
- With Header Compression (HC), the maximum payload length = 346 bytes
This max payload value is derived from the formula given in the table. Also shown in are values of the parameters and the calculations for the application payload.
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Formula |
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Application Payload Size = (Max Buffer Size) - (PHY + MAC + 6LoWPAN + IPv6 + UDP)
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Parameter |
Value (Bytes) |
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Max Buffer Size |
400 |
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UDP Header Size |
8 |
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IPv6 Header Size |
40 |
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6LoWPAN Header Size |
2/19 |
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MAC Header Size |
21 |
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MAC Footer Size(CRC) |
4 |
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PHY Header Size |
2 |
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Calculations |
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Without AD6LoWPAN Header Compression |
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Max Buffer Size = 400. (PHY + MAC + 6LoWPAN (uncompressed) + IPv6 + UDP) = 77. Application Payload Size = (400 – 77)= 323 Bytes <== (with No HC) |
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With AD6LoWPAN Header Compression |
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Max Buffer Size = 400. (PHY + MAC + 6LoWPAN (compressed) + UDP) = 54. Application Payload Size = (400 – 54)= 346 Bytes <== (with HC) (In this case IPv6 Header is compressed and replaced with 19 bytes of 6LoWPAN Header.) |
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Please note, the AD6LoWPAN uses Fragmentation mechanism for delivering any packet with payload more than 50 bytes.
Question: RE: Maximum payload in AD6LoWPAN? by ezadminThis question has been closed by the EZ team and is assumed answered.