Internet-Draft SCHC Sid Allocation March 2023
Minaburo & Toutain Expires 1 October 2023 [Page]
Workgroup:
schc Working Group
Internet-Draft:
draft-toutain-schc-sid-allocation-00
Published:
Intended Status:
Standards Track
Expires:
Authors:
A. Minaburo
Acklio
L. Toutain
Institut MINES TELECOM; IMT Atlantique

SCHC Sid Allocation

Abstract

blabla

Status of This Memo

This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.

Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet-Drafts is at https://datatracker.ietf.org/drafts/current/.

Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress."

This Internet-Draft will expire on 1 October 2023.

Table of Contents

1. Introduction

RFC9363 defines a YANG Data Model for SCHC rules. [I-D.ietf-core-sid] specifies the process for SID allocation and management. This document discuss of the SID allocation for RFC9363.

2. SCHC YANG Data Model

The version @2023-01-18 of the SCHC YANG Data Model published in the RFC 9363 contains 136 SIDs (92 for identities, 2 for features and 42 for data). [I-D.ietf-core-sid] indicates that the SID range for the YANG Data Model specified in RFC is between 1000 and 59 000 and that the maximum request pool SHOULD NOT exceed 1000. The draft also gives some pre allocated values.

Since SIDs will be used either to represent unique identity contained in the data model and also leaves (data) forming this data model, it could be wise to distinguish between identifiers and data.

Data structures are delta encoded and included as a CBOR element, the size depends on the value. Deltas between -24 and +23 are encoded on a single byte. Deltas between -256 and +255 use 2 bytes and larger values corresponding to the RFC SID range will be encoded into 3 bytes. To optimize the CORECONF representation delta should be smaller as possible for the more frequent leaves.

On the other hand identities are included in the CORECONF representation and for the RFC SID range the size is constant and equal to 3 bytes.

2.1. Example

CORECONF

{5095: {1: [{4:
        [{1: 5015,
          5: 5018,
          6: 5068,
          7: 4,
          8: 1,
          9: 5083,
          13: [{1: 0, 2: h'06'}]},
         {1: 5015,
          5: 5018,
          6: 2000003,
          7: 8,
          8: 1,
          9: 5083,
          13: [{1: 0, 2: h'00'}]}]
    }]}
}


RESTCONF

{"ietf-schc:schc": {"rule": [{"entry":
             [{"comp-decomp-action": "ietf-schc:cda-not-sent",
               "direction-indicator": "ietf-schc:di-bidirectional",
               "field-id": "ietf-schc:fid-ipv6-version",
               "field-length": 4,
               "field-position": 1,
               "matching-operator": "ietf-schc:mo-equal",
               "target-value": [{"index": 0, "value": "Bg=="}]},
              {"comp-decomp-action": "ietf-schc:cda-not-sent",
               "direction-indicator": "ietf-schc:di-bidirectional",
               "field-id": "ietf-schc-oam:fid-icmpv6-type",
               "field-length": 8,
               "field-position": 1,
               "matching-operator": "ietf-schc:mo-equal",
               "target-value": [{"index": 0, "value": "gA=="}]} ]
         }]}
    }

Figure 1

The example in Figure 1 gives a CORECONF structure transposed the CBOR diagnostic notation and its equivalent in RESTCONF with JSON. For readability and compactness, this example is edited and do not encode a full rule as defined in RFC9363.

The default SID numbering produced by pyang is used, starting from 5000 for SCHC Data Model defined in RFC9363 and 2000000 for an experimental module for OAM.

We can see the delta encoding. The first SID 5095 represents "ietf-schc:schc". "/ietf-schc:schc/rule" which is coded with a +1 since SID 5096 has been assigned. "/ietf-schc:schc/rule/entry" is coded with a delta of 4. Then a list of Field Description follows. +1 represents the leaf "ietf-schc:schc/rule/entry/comp-decomp-action" and the value assigned to that key contains the SID of "ietf-schc:cda-not-sent" identity.

Note that the second element contains a "field-id" belonging to the "ietf-schc-oam" module and the associate SID is 2000003.

3. Recommendation for SID values

The SCHC YANG Data Model defined in RFC 9363 will probably be augmented, to include for instance access control data. To keep a compact representation, delta values must be kept as small as possible. The LPWAN working group should not use the automatic SID numbering and provide a more optimal allocation scheme for augmentation of the SCHC YANG Data Model.

A first recommendation is to avoid merging data and identity in order to limit the delta encoding. The distance between these two sections can be 255 SID to allow deltas on 2 bytes.

The second recommendation is to leave some unused SID around SCHC rules to allow augmentation.

4. SID value impact

To study the impact of SIDs size and delta size, we will take three scenarii, which cover the original Data Model defined in [RFC9363] and some augmentations, rules regarding these scenarii are listed in the annex:

For this three group of Set of Rule, we applied four different allocation methods for the SIDs:

The following table shows the results:

  +------------+------------+------------+------------+------------+--------+
  |            |   million  |  IETF      |  IETF      |  IESG      |  JSON  |
  |            |            |  separate  |  grouped   |  (dream)   |        |
  +------------+------------+------------+------------+------------+--------+
  | sor-9363   | 2194       | 1740 (-454)| 1721 (-19) | 1586 (-135)| 15388  |
  +------------+------------+------------+------------+------------+--------+
  | sor-oam    | 2841       | 2265 (-576)| 2243 (-22) | 2064 (-179)| 19871  |
  +------------+------------+------------+------------+------------+--------+
  | sor-oam+ac | 2925       | 2321 (-604)| 2271 (-50) | 2092 (-179)| 20686  |’
  +------------+------------+------------+------------+------------+--------+

Figure 2: Size in Bytes SID allocations strategies

The most important result, is the factor 10 between CBOR and JSON (without indentation) size which proves the efficiency of encoding. 2 kilo-byte of information to represent 8 rules (3 compression and 5 fragmentation rules).

The IETF-grouped has a impact on the rule size, even when no augmentation is perform. This is the case for rfc9363 compatible rules and OAM addition. Figure Figure 3 shows the alphabetical order allocation with pyang.

5095       data /ietf-schc:schc
5096       data /ietf-schc:schc/rule
5097       data /ietf-schc:schc/rule/ack-behavior
5098       data /ietf-schc:schc/rule/direction
5099       data /ietf-schc:schc/rule/dtag-size
5100       data /ietf-schc:schc/rule/entry
5101       data /ietf-schc:schc/rule/entry/comp-decomp-action
5102       data /ietf-schc:schc/rule/entry/comp-decomp-action-value
5103       data /ietf-schc:schc/rule/entry/comp-decomp-action-value/index
5104       data /ietf-schc:schc/rule/entry/comp-decomp-action-value/value
5105       data /ietf-schc:schc/rule/entry/direction-indicator
5106       data /ietf-schc:schc/rule/entry/field-id
5107       data /ietf-schc:schc/rule/entry/field-length
5108       data /ietf-schc:schc/rule/entry/field-position
5109       data /ietf-schc:schc/rule/entry/matching-operator
5110       data /ietf-schc:schc/rule/entry/matching-operator-value
5111       data /ietf-schc:schc/rule/entry/matching-operator-value/index
5112       data /ietf-schc:schc/rule/entry/matching-operator-value/value
5113       data /ietf-schc:schc/rule/entry/target-value
5114       data /ietf-schc:schc/rule/entry/target-value/index
5115       data /ietf-schc:schc/rule/entry/target-value/value
5116       data /ietf-schc:schc/rule/fcn-size
5117       data /ietf-schc:schc/rule/fragmentation-mode
5118       data /ietf-schc:schc/rule/inactivity-timer
------ 23 delta limit
5119       data /ietf-schc:schc/rule/inactivity-timer/ticks-duration
5120       data /ietf-schc:schc/rule/inactivity-timer/ticks-numbers
5121       data /ietf-schc:schc/rule/l2-word-size
5122       data /ietf-schc:schc/rule/max-ack-requests
5123       data /ietf-schc:schc/rule/max-interleaved-frames
5124       data /ietf-schc:schc/rule/maximum-packet-size
5125       data /ietf-schc:schc/rule/rcs-algorithm
5126       data /ietf-schc:schc/rule/retransmission-timer
5127       data /ietf-schc:schc/rule/retransmission-timer/ticks-duration
5128       data /ietf-schc:schc/rule/retransmission-timer/ticks-numbers
5129       data /ietf-schc:schc/rule/rule-id-length
5130       data /ietf-schc:schc/rule/rule-id-value
5131       data /ietf-schc:schc/rule/rule-nature
5132       data /ietf-schc:schc/rule/tile-in-all-1
5133       data /ietf-schc:schc/rule/tile-size
5134       data /ietf-schc:schc/rule/w-size
5135       data /ietf-schc:schc/rule/window-size
Figure 3: Alphabetical order of SIDs

"Rule-id-value", "rule-id-length", "rule-nature" present in all rules have a delta higher than 23. On the other hand, other elements such are matching-operator-value or comp-decomp-action-value which are not present in all rules have a smaller delta. Figure {#Allocation} gives the manual SID allocation used in this document. This lead to a reduction of about 20 bytes (a mean of 5 bytes for the 8 rules in the example) when no augmentation is perform. In case of augmentation with the last example including access control, this leads to 50 bytes.

Manual allocation allows also to use some other space, the last scenario takes 10 values (1%) from the IESG space for the most frequent identity.

4.1. Administrative process

The allocation process proposed in [I-D.ietf-core-sid] is slightly enhanced:

  • the SCHC WG requests IANA for a larger pool of SIDs than originally needed for a single Data Model (for instance 500 SIDs)
  • the SCHC WG MAY request IESG review for a small amount of SIDs
  • the WG manages the space as presented in Appendix B.
  • If a module is validated by the WG and request a WG allocation, the SID are allocated in the space and a sid file is issue for this module.

The result is a better allocation of the space, [I-D.ietf-core-sid] proposes a minimum of 50 SIDs per module, but looking at the existing models, the effective number is smaller. Using a common pool, allows a better utilization.

5. Normative References

[I-D.ietf-core-sid]
Veillette, M., Pelov, A., Petrov, I., Bormann, C., and M. Richardson, "YANG Schema Item iDentifier (YANG SID)", Work in Progress, Internet-Draft, draft-ietf-core-sid-20, , <https://datatracker.ietf.org/doc/html/draft-ietf-core-sid-20>.
[I-D.ietf-lpwan-schc-compound-ack]
Zúñiga, J. C., Gomez, C., Aguilar, S., Toutain, L., Cespedes, S., and D. S. W. L. Torre, "SCHC Compound ACK", Work in Progress, Internet-Draft, draft-ietf-lpwan-schc-compound-ack-16, , <https://datatracker.ietf.org/doc/html/draft-ietf-lpwan-schc-compound-ack-16>.
[I-D.ietf-lpwan-schc-yang-data-model]
Minaburo, A. and L. Toutain, "A YANG Data Model for Static Context Header Compression (SCHC)", Work in Progress, Internet-Draft, draft-ietf-lpwan-schc-yang-data-model-21, , <https://datatracker.ietf.org/doc/html/draft-ietf-lpwan-schc-yang-data-model-21>.
[I-D.toutain-lpwan-access-control]
Minaburo, A., Toutain, L., and I. Martinez, "SCHC Rule Access Control", Work in Progress, Internet-Draft, draft-toutain-lpwan-access-control-01, , <https://datatracker.ietf.org/doc/html/draft-toutain-lpwan-access-control-01>.
[RFC8341]
Bierman, A. and M. Bjorklund, "Network Configuration Access Control Model", STD 91, RFC 8341, DOI 10.17487/RFC8341, , <https://www.rfc-editor.org/rfc/rfc8341>.
[RFC8824]
Minaburo, A., Toutain, L., and R. Andreasen, "Static Context Header Compression (SCHC) for the Constrained Application Protocol (CoAP)", RFC 8824, DOI 10.17487/RFC8824, , <https://www.rfc-editor.org/rfc/rfc8824>.
[RFC9363]
Minaburo, A. and L. Toutain, "A YANG Data Model for Static Context Header Compression (SCHC)", RFC 9363, DOI 10.17487/RFC9363, , <https://www.rfc-editor.org/rfc/rfc9363>.

Appendix A. Set of Rules

[
    {
    "RuleID": 5,
    "RuleIDLength": 3,
    "Compression": [
      {"FID": "IPV6.VER", "TV": 6, "MO": "equal", "CDA": "not-sent"},
      {"FID": "IPV6.TC",  "TV": 1, "MO": "equal", "CDA": "not-sent"},
      {"FID": "IPV6.FL",  "TV": 144470, "MO": "ignore","CDA": "not-sent"},
      {"FID": "IPV6.LEN",          "MO": "ignore","CDA": "compute-length"},
      {"FID": "IPV6.NXT", "TV": 17, "MO": "ignore", "CDA": "value-sent"},
      {"FID": "IPV6.HOP_LMT", "TV" : 255,"MO": "ignore","CDA": "not-sent"},
      {"FID": "IPV6.DEV_PREFIX","TV": ["2001:db8::/64",
                                       "fe80::/64",
                                       "2001:0420:c0dc:1002::/64" ],
                                         "MO": "match-mapping","CDA": "mapping-sent"},
      {"FID": "IPV6.DEV_IID", "TV": "::1","MO": "equal","CDA": "DEVIID"},
      {"FID": "IPV6.APP_PREFIX","TV": [ "2001:db8:1::/64",
                                        "fe80::/64",
                                        "2404:6800:4004:818::/64" ],
                                         "MO": "match-mapping","CDA": "mapping-sent"},
      {"FID": "IPV6.APP_IID", "TV": 2,"MO": "equal","CDA": "not-sent"},
      {"FID": "UDP.DEV_PORT",  "TV": 5680,"MO": "MSB", "MO.VAL": 12, "CDA": "LSB"},
      {"FID": "UDP.APP_PORT",  "TV": 5680,"MO": "MSB", "MO.VAL": 12, "CDA" : "LSB"},
      {"FID": "UDP.LEN",       "TV": 0,   "MO": "ignore","CDA": "compute-length"},
      {"FID": "UDP.CKSUM",     "TV": 0,  "MO": "ignore","CDA": "compute-checksum"},
      {"FID": "COAP.VER", "TV": 1,    "MO": "equal","CDA": "not-sent"},
      {"FID": "COAP.TYPE",                "MO": "ignore","CDA": "value-sent"},
      {"FID": "COAP.TKL",                 "MO": "ignore","CDA": "value-sent"},
      {"FID": "COAP.CODE",                "MO": "ignore","CDA": "value-sent"},
      {"FID": "COAP.MID",                 "MO": "ignore","CDA": "value-sent"},
      {"FID": "COAP.TOKEN",                 "MO": "ignore","CDA": "value-sent"},
      {"FID": "COAP.Uri-Path", "FL": "var", "FP": 1, "DI": "UP", "TV": "foo","MO": "equal","CDA": "not-sent"},
      {"FID": "COAP.Uri-Path", "FL": "var", "FP": 2, "DI": "UP", "TV": ["bar", "toto"] ,"MO": "match-mapping","CDA": "mapping-sent"},
      {"FID": "COAP.Uri-Path", "FL": "var", "FP": 3, "DI": "UP",             "MO": "ignore","CDA": "value-sent"},
      {"FID": "COAP.Uri-Path", "FL": "var", "FP": 4, "DI": "UP",             "MO": "ignore","CDA": "value-sent"},
      {"FID": "COAP.Uri-Query", "FL": "var", "FP": 1, "DI": "UP", "TV":"k=", "MO": "MSB", "MO.VAL": 16, "CDA": "LSB"},
      {"FID": "COAP.Content-Format",                  "DI": "DW", "TV": 30, "MO": "equal", "CDA": "not-sent"}
    ]
},{
    "RuleID": 1,
    "RuleIDLength": 3,
    "Fragmentation" : {
        "FRMode": "AckOnError",
        "FRDirection" : "DW",
        "FRModeProfile": {
            "dtagSize": 2,
            "WSize": 7,
            "FCNSize": 3,
            "ackBehavior": "afterAll1",
            "tileSize": 17,
            "MICAlgorithm": "RCS_RFC8724",
            "MICWordSize": 8,
            "L2WordSize": 8,
            "lastTileInAll1": false
        }
    }
},{
    "RuleID": 2,
    "RuleIDLength": 3,
    "Fragmentation": {
        "FRMode": "AckOnError",
        "FRDirection" : "UP",
        "FRModeProfile": {
            "dtagSize": 2,
            "WSize": 7,
            "FCNSize": 3,
            "ackBehavior": "afterAll1",
            "tileSize": 16,
            "MICAlgorithm": "RCS_RFC8724",
            "MICWordSize": 8,
            "L2WordSize": 8,
            "lastTileInAll1": false
        }
    }
},{
    "RuleID": 3,
    "RuleIDLength": 3,
    "Fragmentation": {
        "FRMode": "NoAck",
        "FRDirection" : "DW",
        "FRModeProfile": {
            "dtagSize": 2,
            "FCNSize": 3,
            "MICAlgorithm": "RCS_RFC8724",
            "MICWordSize": 8,
            "L2WordSize": 8
        }
    }
  },{
    "RuleID": 4,
    "RuleIDLength": 3,
    "Fragmentation": {
        "FRMode": "NoAck",
        "FRDirection" : "UP",
        "FRModeProfile": {
            "dtagSize": 2,
            "FCNSize": 3
        }
    }
  },{
    "RuleID": 7,
    "RuleIDLength": 3,
    "Fragmentation": {
        "FRMode": "AckAlways",
        "FRDirection" : "UP",
        "FRModeProfile": {
            "dtagSize": 2,
            "FCNSize": 3,
            "WSize" : 1,
            "maxRetry" : 4
        }
    }
  },{
    "RuleID": 100,
    "RuleIDLength": 8,
    "Description": "for CORECONF Traffic, FETCH/iPATCH query from core to device: Query and Answer",
    "Compression": [
        {"FID": "IPV6.VER", "TV": 6, "MO": "equal", "CDA": "not-sent"},
        {"FID": "IPV6.TC",  "TV": 1, "MO": "equal", "CDA": "not-sent"},
        {"FID": "IPV6.FL",  "TV": 144470, "MO": "ignore","CDA": "not-sent"},
        {"FID": "IPV6.LEN",          "MO": "ignore", "CDA": "compute-length"},
        {"FID": "IPV6.NXT", "TV": 17, "MO": "equal", "CDA": "not-sent"},
        {"FID": "IPV6.HOP_LMT", "TV" : 255,"MO": "ignore","CDA": "not-sent"},
        {"FID": "IPV6.DEV_PREFIX","TV": "fe80::/64", "MO": "equal", "CDA": "not-sent"},
        {"FID": "IPV6.DEV_IID", "TV": "::2","MO": "equal","CDA": "not-sent"},
        {"FID": "IPV6.APP_PREFIX", "TV": "fe80::/64", "MO": "equal", "CDA": "not-sent"},
        {"FID": "IPV6.APP_IID", "TV": "::1","MO": "equal","CDA": "not-sent"},
        {"FID": "UDP.DEV_PORT",  "TV": 5683,"MO": "equal", "CDA": "not-sent"},
        {"FID": "UDP.APP_PORT",  "TV": 105683,"MO": "equal", "CDA": "not-sent"},
        {"FID": "UDP.LEN",                 "MO": "ignore","CDA": "compute-length"},
        {"FID": "UDP.CKSUM",               "MO": "ignore","CDA": "compute-checksum"},
        {"FID": "COAP.VER", "TV": 1,    "MO": "equal","CDA": "not-sent"},
        {"FID": "COAP.TYPE", "DI": "DW", "TV": 0,    "MO": "equal","CDA": "not-sent"},
        {"FID": "COAP.TYPE", "DI": "UP", "TV": 69,    "MO": "equal","CDA": "not-sent"},
        {"FID": "COAP.TKL",  "TV" : 0,     "MO": "equal","CDA": "not-sent"},
        {"FID": "COAP.CODE", "DI": "UP", "TV": [5, 7],    "MO": "match-mapping","CDA": "mapping-sent"},
        {"FID": "COAP.CODE", "DI": "DW", "TV": [68, 69], "MO": "match-mapping","CDA": "mapping-sent"},
        {"FID": "COAP.MID",  "TV": 0,                    "MO": "MSB", "MO.VAL": 9, "CDA": "LSB"},
        {"FID": "COAP.Uri-Path", "FL": 8, "FP": 1, "DI": "DW", "TV": "c","MO": "equal","CDA": "not-sent"},
        {"FID": "COAP.Content-Format",  "DI": "BI", "TV": 140, "MO": "equal", "CDA": "not-sent"}
      ]
  }
]
Figure 4: SoR only referenced by RFC9363
[
    {
    "RuleID": 5,
    "RuleIDLength": 3,
    "Compression": [
      {"FID": "IPV6.VER", "TV": 6, "MO": "equal", "CDA": "not-sent"},
      {"FID": "IPV6.TC",  "TV": 1, "MO": "equal", "CDA": "not-sent"},
      {"FID": "IPV6.FL",  "TV": 144470, "MO": "ignore","CDA": "not-sent"},
      {"FID": "IPV6.LEN",          "MO": "ignore","CDA": "compute-length"},
      {"FID": "IPV6.NXT", "TV": 17, "MO": "ignore", "CDA": "value-sent"},
      {"FID": "IPV6.HOP_LMT", "TV" : 255,"MO": "ignore","CDA": "not-sent"},
      {"FID": "IPV6.DEV_PREFIX","TV": ["2001:db8::/64",
                                       "fe80::/64",
                                       "2001:0420:c0dc:1002::/64" ],
                                         "MO": "match-mapping","CDA": "mapping-sent"},
      {"FID": "IPV6.DEV_IID", "TV": "::1","MO": "equal","CDA": "DEVIID"},
      {"FID": "IPV6.APP_PREFIX","TV": [ "2001:db8:1::/64",
                                        "fe80::/64",
                                        "2404:6800:4004:818::/64" ],
                                         "MO": "match-mapping","CDA": "mapping-sent"},
      {"FID": "IPV6.APP_IID", "TV": 2,"MO": "equal","CDA": "not-sent"},
      {"FID": "UDP.DEV_PORT",  "TV": 5680,"MO": "MSB", "MO.VAL": 12, "CDA": "LSB"},
      {"FID": "UDP.APP_PORT",  "TV": 5680,"MO": "MSB", "MO.VAL": 12, "CDA" : "LSB"},
      {"FID": "UDP.LEN",       "TV": 0,   "MO": "ignore","CDA": "compute-length"},
      {"FID": "UDP.CKSUM",     "TV": 0,  "MO": "ignore","CDA": "compute-checksum"},
      {"FID": "COAP.VER", "TV": 1,    "MO": "equal","CDA": "not-sent"},
      {"FID": "COAP.TYPE",                "MO": "ignore","CDA": "value-sent"},
      {"FID": "COAP.TKL",                 "MO": "ignore","CDA": "value-sent"},
      {"FID": "COAP.CODE",                "MO": "ignore","CDA": "value-sent"},
      {"FID": "COAP.MID",                 "MO": "ignore","CDA": "value-sent"},
      {"FID": "COAP.TOKEN",                 "MO": "ignore","CDA": "value-sent"},
      {"FID": "COAP.Uri-Path", "FL": "var", "FP": 1, "DI": "UP", "TV": "foo","MO": "equal","CDA": "not-sent"},
      {"FID": "COAP.Uri-Path", "FL": "var", "FP": 2, "DI": "UP", "TV": ["bar", "toto"] ,"MO": "match-mapping","CDA": "mapping-sent"},
      {"FID": "COAP.Uri-Path", "FL": "var", "FP": 3, "DI": "UP",             "MO": "ignore","CDA": "value-sent"},
      {"FID": "COAP.Uri-Path", "FL": "var", "FP": 4, "DI": "UP",             "MO": "ignore","CDA": "value-sent"},
      {"FID": "COAP.Uri-Query", "FL": "var", "FP": 1, "DI": "UP", "TV":"k=", "MO": "MSB", "MO.VAL": 16, "CDA": "LSB"},
      {"FID": "COAP.Content-Format",                  "DI": "DW", "TV": 30, "MO": "equal", "CDA": "not-sent"}
    ]
},{
    "RuleID": 6,
    "RuleIDLength": 3,
    "Compression": [
      {"FID": "IPV6.VER", "TV": 6, "MO": "equal", "CDA": "not-sent"},
      {"FID": "IPV6.TC",  "TV": 0, "MO": "equal", "CDA": "not-sent"},
      {"FID": "IPV6.FL",  "TV": 0, "MO": "ignore","CDA": "not-sent"},
      {"FID": "IPV6.LEN",          "MO": "ignore","CDA": "compute-length"},
      {"FID": "IPV6.NXT", "TV": 58, "MO": "equal", "CDA": "not-sent"},
      {"FID": "IPV6.HOP_LMT", "TV" : 255,"MO": "ignore","CDA": "not-sent"},
      {"FID": "IPV6.DEV_PREFIX","TV": ["2001:db8::/64",
                                       "fe80::/64",
                                       "2001:0420:c0dc:1002::/64" ],
                                         "MO": "match-mapping","CDA": "mapping-sent"},
      {"FID": "IPV6.DEV_IID", "TV": "::79","MO": "equal","CDA": "DEVIID"},
      {"FID": "IPV6.APP_PREFIX","TV": [ "2001:db8:1::/64",
                                        "fe80::/64",
                                        "2404:6800:4004:818::/64" ],
                                         "MO": "match-mapping","CDA": "mapping-sent"},
      {"FID": "IPV6.APP_IID", "TV": 2004,"MO": "equal","CDA": "not-sent"},
      {"FID": "ICMPV6.TYPE",  "TV": 128,"MO": "equal","CDA": "not-sent"},
      {"FID": "ICMPV6.CODE",  "TV": 0,  "MO": "equal","CDA": "not-sent"},
      {"FID": "ICMPV6.CKSUM", "TV": 0, "MO": "ignore","CDA": "compute-checksum"},
      {"FID": "ICMPV6.IDENT", "TV": 0,"MO": "ignore","CDA": "value-sent"},
      {"FID": "ICMPV6.SEQNO", "TV": 0,"MO": "ignore","CDA": "value-sent"}
    ]
},{
    "RuleID": 1,
    "RuleIDLength": 3,
    "Fragmentation" : {
        "FRMode": "AckOnError",
        "FRDirection" : "DW",
        "FRModeProfile": {
            "dtagSize": 2,
            "WSize": 7,
            "FCNSize": 3,
            "ackBehavior": "afterAll1",
            "tileSize": 17,
            "MICAlgorithm": "RCS_RFC8724",
            "MICWordSize": 8,
            "L2WordSize": 8,
            "lastTileInAll1": false
        }
    }
},{
    "RuleID": 2,
    "RuleIDLength": 3,
    "Fragmentation": {
        "FRMode": "AckOnError",
        "FRDirection" : "UP",
        "FRModeProfile": {
            "dtagSize": 2,
            "WSize": 7,
            "FCNSize": 3,
            "ackBehavior": "afterAll1",
            "tileSize": 16,
            "MICAlgorithm": "RCS_RFC8724",
            "MICWordSize": 8,
            "L2WordSize": 8,
            "lastTileInAll1": false
        }
    }
},{
    "RuleID": 3,
    "RuleIDLength": 3,
    "Fragmentation": {
        "FRMode": "NoAck",
        "FRDirection" : "DW",
        "FRModeProfile": {
            "dtagSize": 2,
            "FCNSize": 3,
            "MICAlgorithm": "RCS_RFC8724",
            "MICWordSize": 8,
            "L2WordSize": 8
        }
    }
  },{
    "RuleID": 4,
    "RuleIDLength": 3,
    "Fragmentation": {
        "FRMode": "NoAck",
        "FRDirection" : "UP",
        "FRModeProfile": {
            "dtagSize": 2,
            "FCNSize": 3
        }
    }
  },{
    "RuleID": 7,
    "RuleIDLength": 3,
    "Fragmentation": {
        "FRMode": "AckAlways",
        "FRDirection" : "UP",
        "FRModeProfile": {
            "dtagSize": 2,
            "FCNSize": 3,
            "WSize" : 1,
            "maxRetry" : 4
        }
    }
  },{
    "RuleID": 100,
    "RuleIDLength": 8,
    "Description": "for CORECONF Traffic, FETCH/iPATCH query from core to device: Query and Answer",
    "Compression": [
        {"FID": "IPV6.VER", "TV": 6, "MO": "equal", "CDA": "not-sent"},
        {"FID": "IPV6.TC",  "TV": 1, "MO": "equal", "CDA": "not-sent"},
        {"FID": "IPV6.FL",  "TV": 144470, "MO": "ignore","CDA": "not-sent"},
        {"FID": "IPV6.LEN",          "MO": "ignore", "CDA": "compute-length"},
        {"FID": "IPV6.NXT", "TV": 17, "MO": "equal", "CDA": "not-sent"},
        {"FID": "IPV6.HOP_LMT", "TV" : 255,"MO": "ignore","CDA": "not-sent"},
        {"FID": "IPV6.DEV_PREFIX","TV": "fe80::/64", "MO": "equal", "CDA": "not-sent"},
        {"FID": "IPV6.DEV_IID", "TV": "::2","MO": "equal","CDA": "not-sent"},
        {"FID": "IPV6.APP_PREFIX", "TV": "fe80::/64", "MO": "equal", "CDA": "not-sent"},
        {"FID": "IPV6.APP_IID", "TV": "::1","MO": "equal","CDA": "not-sent"},
        {"FID": "UDP.DEV_PORT",  "TV": 5683,"MO": "equal", "CDA": "not-sent"},
        {"FID": "UDP.APP_PORT",  "TV": 105683,"MO": "equal", "CDA": "not-sent"},
        {"FID": "UDP.LEN",                 "MO": "ignore","CDA": "compute-length"},
        {"FID": "UDP.CKSUM",               "MO": "ignore","CDA": "compute-checksum"},
        {"FID": "COAP.VER", "TV": 1,    "MO": "equal","CDA": "not-sent"},
        {"FID": "COAP.TYPE", "DI": "DW", "TV": 0,    "MO": "equal","CDA": "not-sent"},
        {"FID": "COAP.TYPE", "DI": "UP", "TV": 69,    "MO": "equal","CDA": "not-sent"},
        {"FID": "COAP.TKL",  "TV" : 0,     "MO": "equal","CDA": "not-sent"},
        {"FID": "COAP.CODE", "DI": "UP", "TV": [5, 7],    "MO": "match-mapping","CDA": "mapping-sent"},
        {"FID": "COAP.CODE", "DI": "DW", "TV": [68, 69], "MO": "match-mapping","CDA": "mapping-sent"},
        {"FID": "COAP.MID",  "TV": 0,                    "MO": "MSB", "MO.VAL": 9, "CDA": "LSB"},
        {"FID": "COAP.Uri-Path", "FL": 8, "FP": 1, "DI": "DW", "TV": "c","MO": "equal","CDA": "not-sent"},
        {"FID": "COAP.Content-Format",  "DI": "BI", "TV": 140, "MO": "equal", "CDA": "not-sent"}
      ]
  }
]
Figure 5: SoR including OAM compression
[
    {"access-right" : "modify-existing-element"},
    {
    "RuleID": 5,
    "RuleIDLength": 3,
    "access-right" : "modify-existing-element",
    "Compression": [
      {"FID": "IPV6.VER", "TV": 6, "MO": "equal", "CDA": "not-sent"},
      {"FID": "IPV6.TC",  "TV": 1, "MO": "equal", "CDA": "not-sent"},
      {"FID": "IPV6.FL",  "TV": 144470, "MO": "ignore","CDA": "not-sent",
                                                  "access-right" : "change-tv"},
      {"FID": "IPV6.LEN",          "MO": "ignore","CDA": "compute-length"},
      {"FID": "IPV6.NXT", "TV": 17, "MO": "ignore", "CDA": "value-sent"},
      {"FID": "IPV6.HOP_LMT", "TV" : 255,"MO": "ignore","CDA": "not-sent"},
      {"FID": "IPV6.DEV_PREFIX","TV": ["2001:db8::/64",
                                       "fe80::/64",
                                       "2001:0420:c0dc:1002::/64" ],
                                         "MO": "match-mapping","CDA": "mapping-sent"},
      {"FID": "IPV6.DEV_IID", "TV": "::1","MO": "equal","CDA": "DEVIID"},
      {"FID": "IPV6.APP_PREFIX","TV": [ "2001:db8:1::/64",
                                        "fe80::/64",
                                        "2404:6800:4004:818::/64" ],
                                         "MO": "match-mapping","CDA": "mapping-sent",
                                         "access-right" : "change-tv"},
      {"FID": "IPV6.APP_IID", "TV": 2,"MO": "equal","CDA": "not-sent"},
      {"FID": "UDP.DEV_PORT",  "TV": 5680,"MO": "MSB", "MO.VAL": 12, "CDA": "LSB",
                                         "access-right" : "change-tv"},
      {"FID": "UDP.APP_PORT",  "TV": 5680,"MO": "MSB", "MO.VAL": 12, "CDA" : "LSB"},
      {"FID": "UDP.LEN",       "TV": 0,   "MO": "ignore","CDA": "compute-length"},
      {"FID": "UDP.CKSUM",     "TV": 0,  "MO": "ignore","CDA": "compute-checksum"},
      {"FID": "COAP.VER", "TV": 1,    "MO": "equal","CDA": "not-sent"},
      {"FID": "COAP.TYPE",                "MO": "ignore","CDA": "value-sent"},
      {"FID": "COAP.TKL",                 "MO": "ignore","CDA": "value-sent"},
      {"FID": "COAP.CODE",                "MO": "ignore","CDA": "value-sent"},
      {"FID": "COAP.MID",                 "MO": "ignore","CDA": "value-sent"},
      {"FID": "COAP.TOKEN",                 "MO": "ignore","CDA": "value-sent"},
      {"FID": "COAP.Uri-Path", "FL": "var", "FP": 1, "DI": "UP", "TV": "foo","MO": "equal","CDA": "not-sent"},
      {"FID": "COAP.Uri-Path", "FL": "var", "FP": 2, "DI": "UP", "TV": ["bar", "toto"] ,"MO": "match-mapping","CDA": "mapping-sent",
                                                "access-right" : "change-tv"},
      {"FID": "COAP.Uri-Path", "FL": "var", "FP": 3, "DI": "UP",             "MO": "ignore","CDA": "value-sent"},
      {"FID": "COAP.Uri-Path", "FL": "var", "FP": 4, "DI": "UP",             "MO": "ignore","CDA": "value-sent"},
      {"FID": "COAP.Uri-Query", "FL": "var", "FP": 1, "DI": "UP", "TV":"k=", "MO": "MSB", "MO.VAL": 16, "CDA": "LSB"},
      {"FID": "COAP.Content-Format",                  "DI": "DW", "TV": 30, "MO": "equal", "CDA": "not-sent"}
    ]
},{
    "RuleID": 6,
    "RuleIDLength": 3,
    "access-right" : "modify-existing-element",
    "Compression": [
      {"FID": "IPV6.VER", "TV": 6, "MO": "equal", "CDA": "not-sent"},
      {"FID": "IPV6.TC",  "TV": 0, "MO": "equal", "CDA": "not-sent",
                                            "access-right" : "change-tv"},
      {"FID": "IPV6.FL",  "TV": 0, "MO": "ignore","CDA": "not-sent"},
      {"FID": "IPV6.LEN",          "MO": "ignore","CDA": "compute-length"},
      {"FID": "IPV6.NXT", "TV": 58, "MO": "equal", "CDA": "not-sent"},
      {"FID": "IPV6.HOP_LMT", "TV" : 255,"MO": "ignore","CDA": "not-sent"},
      {"FID": "IPV6.DEV_PREFIX","TV": ["2001:db8::/64",
                                       "fe80::/64",
                                       "2001:0420:c0dc:1002::/64" ],
                                         "MO": "match-mapping","CDA": "mapping-sent"},
      {"FID": "IPV6.DEV_IID", "TV": "::79","MO": "equal","CDA": "DEVIID"},
      {"FID": "IPV6.APP_PREFIX","TV": [ "2001:db8:1::/64",
                                        "fe80::/64",
                                        "2404:6800:4004:818::/64" ],
                                         "MO": "match-mapping","CDA": "mapping-sent"},
      {"FID": "IPV6.APP_IID", "TV": 2004,"MO": "equal","CDA": "not-sent"},
      {"FID": "ICMPV6.TYPE",  "TV": 128,"MO": "equal","CDA": "not-sent"},
      {"FID": "ICMPV6.CODE",  "TV": 0,  "MO": "equal","CDA": "not-sent"},
      {"FID": "ICMPV6.CKSUM", "TV": 0, "MO": "ignore","CDA": "compute-checksum"},
      {"FID": "ICMPV6.IDENT", "TV": 0,"MO": "ignore","CDA": "value-sent",
                                                     "access-right" : "change-tv"},
      {"FID": "ICMPV6.SEQNO", "TV": 0,"MO": "ignore","CDA": "value-sent"}
    ]
},{
    "RuleID": 1,
    "RuleIDLength": 3,
    "access-right" : "change-tv",
    "Fragmentation" : {
        "FRMode": "AckOnError",
        "FRDirection" : "DW",
        "FRModeProfile": {
            "dtagSize": 2,
            "WSize": 7,
            "FCNSize": 3,
            "ackBehavior": "afterAll1",
            "tileSize": 17,
            "MICAlgorithm": "RCS_RFC8724",
            "MICWordSize": 8,
            "L2WordSize": 8,
            "lastTileInAll1": false
        }
    }
},{
    "RuleID": 2,
    "RuleIDLength": 3,
    "Fragmentation": {
        "FRMode": "AckOnError",
        "FRDirection" : "UP",
        "FRModeProfile": {
            "dtagSize": 2,
            "WSize": 7,
            "FCNSize": 3,
            "ackBehavior": "afterAll1",
            "tileSize": 16,
            "MICAlgorithm": "RCS_RFC8724",
            "MICWordSize": 8,
            "L2WordSize": 8,
            "lastTileInAll1": false
        }
    }
},{
    "RuleID": 3,
    "RuleIDLength": 3,
    "Fragmentation": {
        "FRMode": "NoAck",
        "FRDirection" : "DW",
        "FRModeProfile": {
            "dtagSize": 2,
            "FCNSize": 3,
            "MICAlgorithm": "RCS_RFC8724",
            "MICWordSize": 8,
            "L2WordSize": 8
        }
    }
  },{
    "RuleID": 4,
    "RuleIDLength": 3,
    "Fragmentation": {
        "FRMode": "NoAck",
        "FRDirection" : "UP",
        "FRModeProfile": {
            "dtagSize": 2,
            "FCNSize": 3
        }
    }
  },{
    "RuleID": 7,
    "RuleIDLength": 3,
    "Fragmentation": {
        "FRMode": "AckAlways",
        "FRDirection" : "UP",
        "FRModeProfile": {
            "dtagSize": 2,
            "FCNSize": 3,
            "WSize" : 1,
            "maxRetry" : 4
        }
    }
  },{
    "RuleID": 100,
    "RuleIDLength": 8,
    "Description": "for CORECONF Traffic, FETCH/iPATCH query from core to device: Query and Answer",
    "access-right" : "change-tv",
    "Compression": [
        {"FID": "IPV6.VER", "TV": 6, "MO": "equal", "CDA": "not-sent"},
        {"FID": "IPV6.TC",  "TV": 1, "MO": "equal", "CDA": "not-sent"},
        {"FID": "IPV6.FL",  "TV": 144470, "MO": "ignore","CDA": "not-sent",
                                                 "access-right" : "change-tv"},
        {"FID": "IPV6.LEN",          "MO": "ignore", "CDA": "compute-length"},
        {"FID": "IPV6.NXT", "TV": 17, "MO": "equal", "CDA": "not-sent"},
        {"FID": "IPV6.HOP_LMT", "TV" : 255,"MO": "ignore","CDA": "not-sent"},
        {"FID": "IPV6.DEV_PREFIX","TV": "fe80::/64", "MO": "equal", "CDA": "not-sent"},
        {"FID": "IPV6.DEV_IID", "TV": "::2","MO": "equal","CDA": "not-sent"},
        {"FID": "IPV6.APP_PREFIX", "TV": "fe80::/64", "MO": "equal", "CDA": "not-sent"},
        {"FID": "IPV6.APP_IID", "TV": "::1","MO": "equal","CDA": "not-sent"},
        {"FID": "UDP.DEV_PORT",  "TV": 5683,"MO": "equal", "CDA": "not-sent",
                                        "access-right" : "change-tv"},
        {"FID": "UDP.APP_PORT",  "TV": 105683,"MO": "equal", "CDA": "not-sent"},
        {"FID": "UDP.LEN",                 "MO": "ignore","CDA": "compute-length"},
        {"FID": "UDP.CKSUM",               "MO": "ignore","CDA": "compute-checksum"},
        {"FID": "COAP.VER", "TV": 1,    "MO": "equal","CDA": "not-sent"},
        {"FID": "COAP.TYPE", "DI": "DW", "TV": 0,    "MO": "equal","CDA": "not-sent"},
        {"FID": "COAP.TYPE", "DI": "UP", "TV": 69,    "MO": "equal","CDA": "not-sent"},
        {"FID": "COAP.TKL",  "TV" : 0,     "MO": "equal","CDA": "not-sent"},
        {"FID": "COAP.CODE", "DI": "UP", "TV": [5, 7],    "MO": "match-mapping","CDA": "mapping-sent"},
        {"FID": "COAP.CODE", "DI": "DW", "TV": [68, 69], "MO": "match-mapping","CDA": "mapping-sent"},
        {"FID": "COAP.MID",  "TV": 0,                    "MO": "MSB", "MO.VAL": 9, "CDA": "LSB"},
        {"FID": "COAP.Uri-Path", "FL": 8, "FP": 1, "DI": "DW", "TV": "c","MO": "equal","CDA": "not-sent",
                                        "access-right" : "change-tv"},
        {"FID": "COAP.Content-Format",  "DI": "BI", "TV": 140, "MO": "equal", "CDA": "not-sent"}
      ]
  }
]
Figure 6: SoR including Access Control

Appendix B. SID Allocation

5000,
5001,
5002,
5003,
5004,
5005,
5006,
5007,
5008,
5009,
5010,
5011,
5012,
5013,
5014,
5015,
5016,
5017,
5018,
5019,
5020,
5021,
5022,module,ietf-schc-access-control
5023,module,ietf-schc
5024,data,/ietf-schc:schc
5025,
5026,
5027,
5028,
5029,
5030,
5031,
5032,
5033,
5034,
5035,
5036,
5037,
5038,
5039,
5040,
5041,
5042,data,/ietf-schc:schc/ietf-schc-access-control:ac-modify-set-of-rules
5043,data,/ietf-schc:schc/rule/fcn-size
5044,data,/ietf-schc:schc/rule/w-size
5045,data,/ietf-schc:schc/rule/direction
5046,data,/ietf-schc:schc/rule/fragmentation-mode
5047,data,/ietf-schc:schc/rule
5048,data,/ietf-schc:schc/rule/rule-id-length
5049,data,/ietf-schc:schc/rule/rule-id-value
5050,data,/ietf-schc:schc/rule/rule-nature
5051,data,/ietf-schc:schc/rule/ietf-schc-access-control:ac-modify-rule
5052,
5053,
5054,
5055,
5056,
5057,
5058,
5059,
5060,
5061,
5062,
5063,
5064,
5065,
5066,
5067,
5068,
5069,data,/ietf-schc:schc/rule/entry/ietf-schc-access-control:ac-modify-field
5070,data,/ietf-schc:schc/rule/entry
5071,data,/ietf-schc:schc/rule/entry/comp-decomp-action
5072,data,/ietf-schc:schc/rule/entry/comp-decomp-action-value
5073,data,/ietf-schc:schc/rule/entry/comp-decomp-action-value/index
5074,data,/ietf-schc:schc/rule/entry/comp-decomp-action-value/value
5075,data,/ietf-schc:schc/rule/entry/direction-indicator
5076,data,/ietf-schc:schc/rule/entry/field-id
5077,data,/ietf-schc:schc/rule/entry/field-length
5078,data,/ietf-schc:schc/rule/entry/field-position
5079,data,/ietf-schc:schc/rule/entry/matching-operator
5080,data,/ietf-schc:schc/rule/entry/matching-operator-value
5081,data,/ietf-schc:schc/rule/entry/matching-operator-value/index
5082,data,/ietf-schc:schc/rule/entry/matching-operator-value/value
5083,data,/ietf-schc:schc/rule/entry/target-value
5084,data,/ietf-schc:schc/rule/entry/target-value/index
5085,data,/ietf-schc:schc/rule/entry/target-value/value
5086,
5087,
5088,
5089,
5090,
5091,
5092,
5093,
5094,data,/ietf-schc:schc/rule/ack-behavior
5095,
5096,data,/ietf-schc:schc/rule/dtag-size
5097,
5098,
5099,data,/ietf-schc:schc/rule/inactivity-timer
5100,data,/ietf-schc:schc/rule/inactivity-timer/ticks-duration
5101,data,/ietf-schc:schc/rule/inactivity-timer/ticks-numbers
5102,data,/ietf-schc:schc/rule/l2-word-size
5103,data,/ietf-schc:schc/rule/max-ack-requests
5104,data,/ietf-schc:schc/rule/max-interleaved-frames
5105,data,/ietf-schc:schc/rule/maximum-packet-size
5106,data,/ietf-schc:schc/rule/rcs-algorithm
5107,data,/ietf-schc:schc/rule/retransmission-timer
5108,data,/ietf-schc:schc/rule/retransmission-timer/ticks-duration
5109,data,/ietf-schc:schc/rule/retransmission-timer/ticks-numbers
5110,data,/ietf-schc:schc/rule/ietf-schc-oam:proxy-behavior
5111,
5112,
5113,
5114,
5115,
5116,data,/ietf-schc:schc/rule/tile-in-all-1
5117,data,/ietf-schc:schc/rule/tile-size
5118,
5119,data,/ietf-schc:schc/rule/window-size
5120,
5121,
5122,
5123,
5124,
5125,
5126,
5127,
5128,
5129,
5130,
5131,
5132,
5133,
5134,
5135,
5136,
5137,
5138,
5139,
5140,
5141,
5142,
5143,
5144,
5145,
5146,
5147,
5148,
5149,
5150,
5151,
5152,
5153,
5154,
5155,
5156,
5157,
5158,
5159,
5160,
5161,
5162,
5163,
5164,
5165,
5166,
5167,
5168,
5169,
5170,
5171,
5172,
5173,
5174,
5175,
5176,
5177,
5178,
5179,
5180,
5181,
5182,
5183,
5184,
5185,
5186,
5187,
5188,
5189,
5190,
5191,
5192,
5193,
5194,
5195,
5196,
5197,
5198,
5199,
5200,
5201,
5202,
5203,
5204,
5205,
5206,
5207,
5208,
5209,
5210,
5211,
5212,
5213,
5214,
5215,
5216,
5217,
5218,
5219,
5220,
5221,
5222,
5223,
5224,
5225,
5226,
5227,
5228,
5229,
5230,
5231,
5232,
5233,
5234,
5235,
5236,
5237,
5238,
5239,
5240,
5241,
5242,
5243,
5244,
5245,
5246,
5247,
5248,
5249,
5250,
5251,
5252,
5253,
5254,
5255,
5256,
5257,
5258,
5259,
5260,
5261,
5262,
5263,
5264,
5265,
5266,
5267,
5268,
5269,
5270,
5271,
5272,
5273,
5274,
5275,
5276,
5277,
5278,
5279,
5280,
5281,
5282,
5283,
5284,
5285,
5286,
5287,
5288,
5289,
5290,
5291,
5292,
5293,
5294,
5295,
5296,
5297,
5298,
5299,
5300,identity,ack-behavior-after-all-0
5301,identity,ack-behavior-after-all-1
5302,identity,ack-behavior-base-type
5303,identity,ack-behavior-by-layer2
5304,identity,all-1-data-base-type
5305,identity,all-1-data-no
5306,identity,all-1-data-sender-choice
5307,identity,all-1-data-yes
5308,identity,cda-appiid
5309,identity,cda-base-type
5310,identity,cda-compute
5311,identity,cda-deviid
5312,identity,cda-lsb
5313,identity,cda-mapping-sent
5314,identity,cda-not-sent
5315,identity,cda-value-sent
5316,identity,di-base-type
5317,identity,di-bidirectional
5318,identity,di-down
5319,identity,di-up
5320,identity,fid-base-type
5321,identity,fid-coap-base-type
5322,identity,fid-coap-code
5323,identity,fid-coap-code-class
5324,identity,fid-coap-code-detail
5325,identity,fid-coap-mid
5326,identity,fid-coap-option
5327,identity,fid-coap-option-accept
5328,identity,fid-coap-option-block1
5329,identity,fid-coap-option-block2
5330,identity,fid-coap-option-content-format
5331,identity,fid-coap-option-etag
5332,identity,fid-coap-option-if-match
5333,identity,fid-coap-option-if-none-match
5334,identity,fid-coap-option-location-path
5335,identity,fid-coap-option-location-query
5336,identity,fid-coap-option-max-age
5337,identity,fid-coap-option-no-response
5338,identity,fid-coap-option-observe
5339,identity,fid-coap-option-oscore-flags
5340,identity,fid-coap-option-oscore-kid
5341,identity,fid-coap-option-oscore-kidctx
5342,identity,fid-coap-option-oscore-piv
5343,identity,fid-coap-option-proxy-scheme
5344,identity,fid-coap-option-proxy-uri
5345,identity,fid-coap-option-size1
5346,identity,fid-coap-option-size2
5347,identity,fid-coap-option-uri-host
5348,identity,fid-coap-option-uri-path
5349,identity,fid-coap-option-uri-port
5350,identity,fid-coap-option-uri-query
5351,identity,fid-coap-tkl
5352,identity,fid-coap-token
5353,identity,fid-coap-type
5354,identity,fid-coap-version
5355,identity,fid-ipv6-appiid
5356,identity,fid-ipv6-appprefix
5357,identity,fid-ipv6-base-type
5358,identity,fid-ipv6-deviid
5359,identity,fid-ipv6-devprefix
5360,identity,fid-ipv6-flowlabel
5361,identity,fid-ipv6-hoplimit
5362,identity,fid-ipv6-nextheader
5363,identity,fid-ipv6-payload-length
5364,identity,fid-ipv6-trafficclass
5365,identity,fid-ipv6-trafficclass-ds
5366,identity,fid-ipv6-trafficclass-ecn
5367,identity,fid-ipv6-version
5368,identity,fid-oscore-base-type
5369,identity,fid-udp-app-port
5370,identity,fid-udp-base-type
5371,identity,fid-udp-checksum
5372,identity,fid-udp-dev-port
5373,identity,fid-udp-length
5374,identity,fl-base-type
5375,identity,fl-token-length
5376,identity,fl-variable
5377,identity,fragmentation-mode-ack-always
5378,identity,fragmentation-mode-ack-on-error
5379,identity,fragmentation-mode-base-type
5380,identity,fragmentation-mode-no-ack
5381,identity,mo-base-type
5382,identity,mo-equal
5383,identity,mo-ignore
5384,identity,mo-match-mapping
5385,identity,mo-msb
5386,identity,nature-base-type
5387,identity,nature-compression
5388,identity,nature-fragmentation
5389,identity,nature-no-compression
5390,identity,rcs-algorithm-base-type
5391,identity,rcs-crc32
5392,feature,compression
5393,feature,fragmentation
5394,module,ietf-schc-oam
5395,identity,fid-icmpv6-base-type
5396,identity,fid-icmpv6-checksum
5397,identity,fid-icmpv6-code
5398,identity,fid-icmpv6-identifier
5399,identity,fid-icmpv6-sequence
5400,identity,fid-icmpv6-type
5401,identity,proxy-none
5402,identity,proxy-pingv6
5403,identity,proxy-schc-message
Figure 7: Manual SID allocation

Appendix C. Security Considerations

TBD

Appendix D. IANA Considerations

TBD

Authors' Addresses

Ana Minaburo
Acklio
1137A avenue des Champs Blancs
35510 Cesson-Sevigne Cedex
France
Laurent Toutain
Institut MINES TELECOM; IMT Atlantique
2 rue de la Chataigneraie
CS 17607
35576 Cesson-Sevigne Cedex
France