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Static Context Header Compression (SCHC): Advantages and Adaptability

Learn about SCHC, a compression method for LP-WAN with benefits like efficient compression, adapted to star topology, and predictable traffic nodes.

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Static Context Header Compression (SCHC): Advantages and Adaptability

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  1. draft-toutain-6lpwa-ipv6-static-context-hc-01draft-toutain-lpwan-yang-static-context-hc-00draft-toutain-6lpwa-ipv6-static-context-hc-01draft-toutain-lpwan-yang-static-context-hc-00 Static Context Header Compression(SCHC) Laurent Toutain - Ana Minaburo Laurent.Toutain@telecom-bretagne.eu ana@ackl.io IETF 96 - Berlin

  2. Advantages of RoHC and 6Lo(WPAN) • RoHC: flexible, field description • 6Lo(WPAN): IPv6 address compression Context: • Efficient compression • Adapted to LP-WAN architecture: • Star topology • Nodes with predictable traffic

  3. Static Context Header Compression Uncompressed header Uncompressed header Rule id or shim id rule Card 12 Card 12 Card 1 Header description Card 1 Header description context Card 12 (+data)

  4. Context Fields : uncompressed packet, compressed packet, other +---------------------------------------------------------------------+ | Rule N | +---------------------------------------------------------------------+ | | Rule i | | +---------------------------------------------------------------------+ | | | Rule 1 | | | | +---------+-------+------------+--------------+-----------------+ | | | | | Field 1 | Value |match. comp.| match decomp | Action function | | | | | +---------+-------+------------+--------------+-----------------+ | | | | | Field 2 | Value |match. comp.| match decomp | Action function | | | | | +---------+-------+------------+--------------+-----------------+ | | | | | ... | ... |... | ... | ... | | | | | +---------+-------+------------+--------------+-----------------+ | |----+ | | Field N | Value |match. comp.| match decomp | Action function | | | | +---------+-------+------------+--------------+-----------------+ |------+ | | +---------------------------------------------------------------------+

  5. Context /--------------------+-------------+--------------------------\ | Function | Compression | Decompression | | | | | +--------------------+-------------+--------------------------+ |elided |not sent |use value stored in ctxt | |send-value |send |build field from value | |compute-IPv6-length |elided |compute IPv6 length | |compute-UDP-length |elided |compute UDP length | |compute-UDP-checksum|elided |compute UDP checksum | |ESiid-DID |elided |build IID from L2 ES addr | |LCiid-DID |elided |build IID from L2 LA addr | \--------------------+-------------+--------------------------/

  6. Static Context Header Compression End System LPWAN Radio LPWAN Gateway LPWAN Application LC LC ctxt ctxt ctxt LC

  7. Static Context Header Compression End System LPWAN Radio LPWAN Gateway LPWAN Application LC ctxt ctxt LC Shim id Be used for legacy applications Optimization: Out of scope for IETF -need to reconstruct IPv6 and ULP for forwarding and authentication

  8. Static Context Header Compression • Static: Values do not evolve during transmission: • IPv6/UDP have only static values • CoAP can also be compressed: • More complex: asymmetric compression

  9. Yang model for SCHC +--rw generic-rules | +--rw context-name? string | +--rw context-rules* [rule-id] | +--rw rule-name? string | +--rw rule-id int8 | +--rw rule-fields* [field-pos] | +--rw field-name? string | +--rw field-pos int8 | +--rw field-value? LPWA-types | +--rw field-compression-match | | +--rw operator? enumeration | | +--rw (operator-lsb)? | | +--:(lsb-length) | | +--rwlsb-length? LPWA-types | +--rw field-decompression-match | | +--rw operator? enumeration | | +--rw (operator-lsb)? | | +--:(lsb-length) | | +--rwlsb-length? LPWA-types | +--rw action-function? LPWA-action-functions

  10. With CoMI/CoOL End System LPWAN Radio LPWAN Gateway LC ctxt ctxt LC ESPrefix ≈ SLAAC iPATCH /c Content-Format(application/cool-value-pairs+cbor) [ [field-SID, rule-id, field-pos], value ]

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