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Disambiguated example of Rule on eliding a Uri-Path option
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marco-tiloca-sics committed Oct 4, 2024
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26 changes: 16 additions & 10 deletions draft-ietf-schc-8824-update.md
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Expand Up @@ -578,18 +578,18 @@ In this first scenario, the SCHC compressor on the NGW side receives a POST mess
+----------+
~~~~

| Field | FL | FP | DI | TV | MO | CDA | `Sent` <br> `[bits]` |
|-------------------------|-----|----|----|-----------------------------------|-------------------------|------------------------|----------------------|
| `CoAP` <br> `Version` | 2 | 1 | Bi | 01 | equal | not-sent | |
| CoAP Type | 2 | 1 | Dw | CON | equal | not-sent | |
| CoAP Type | 2 | 1 | Up | `[ACK,` <br> `RST]` | `match-` <br> `mapping` | `mapping-` <br> `sent` | T |
| `CoAP` <br> `TKL` | 4 | 1 | Bi | 0 | equal | not-sent | |
| CoAP Code | 8 | 1 | Bi | `[0.00,` <br> `...` <br> `5.05]` | `match-` <br> `mapping` | `mapping-` <br> `sent` | CC CCC |
| `CoAP` <br> `MID` | 16 | 1 | Bi | 0000 | MSB(7) | LSB | MID |
| `CoAP` <br> `Uri-Path` | var | 1 | Dw | `1st element` <br> `of the path` | equal | not-sent | |
| Field | FL | FP | DI | TV | MO | CDA | `Sent` <br> `[bits]` |
|-------------------------|-----|----|----|----------------------------------|-------------------------|------------------------|----------------------|
| `CoAP` <br> `Version` | 2 | 1 | Bi | 01 | equal | not-sent | |
| CoAP Type | 2 | 1 | Dw | CON | equal | not-sent | |
| CoAP Type | 2 | 1 | Up | `[ACK,` <br> `RST]` | `match-` <br> `mapping` | `mapping-` <br> `sent` | T |
| `CoAP` <br> `TKL` | 4 | 1 | Bi | 0 | equal | not-sent | |
| CoAP Code | 8 | 1 | Bi | `[0.00,` <br> `...` <br> `5.05]` | `match-` <br> `mapping` | `mapping-` <br> `sent` | CC CCC |
| `CoAP` <br> `MID` | 16 | 1 | Bi | 0000 | MSB(7) | LSB | MID |
| `CoAP` <br> `Uri-Path` | var | 1 | Dw | "status" | equal | not-sent | |
{: #table-CoAP-header-1 title="CoAP Context to compress header without Token" align="center"}

In this example, SCHC compression elides the version and Token Length fields. The 25 Method and Response Codes defined in {{RFC7252}} have been shrunk to 5 bits using a "match-mapping" MO. The Uri-Path contains a single element indicated in the TV and elided with the CDA "not-sent".
In this example, SCHC compression elides the version and Token Length fields. The 25 Method and Response Codes defined in {{RFC7252}} have been shrunk to 5 bits using a "match-mapping" MO. The Uri-Path contains a single element with the TV set to "status" and the CDA set to "not-sent", thereby eliding the single occurrence of the Uri-Path Option with value "status".

SCHC compression reduces the header, sending only a mapped Type (and only for uplink messages), a mapped code, and the least significant bits of the Message ID (9 bits in the example above).

Expand Down Expand Up @@ -2272,6 +2272,12 @@ module ietf-schc-coap {
# Document Updates # {#sec-document-updates}
{:removeinrfc}

## Version -02 to -03 ## {#sec-02-03}

* Disambiguated example of Rule on eliding a Uri-Path option.

* Fixes and editorial improvements.

## Version -01 to -02 ## {#sec-01-02}

* Added compression for the CoAP options Proxy-CRI and Proxy-Scheme-Number.
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