DLEP Radio Channel Utilization Extension
draft-rogge-manet-dlep-channel-utilization-02

Manet                                                         H.R. Rogge
Internet-Draft                                           Fraunhofer FKIE
Intended status: Standards Track                            7 March 2022
Expires: 8 September 2022

                DLEP Radio Channel Utilization Extension
             draft-rogge-manet-dlep-channel-utilization-02

Abstract

   This document defines an extension to the Dynamic Link Exchange
   Protocol (DLEP) to provide the utilization of a radio channel.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
   2.  Extension Usage and Identification  . . . . . . . . . . . . .   3
   3.  Data Items  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Radio Channel Active Data Item  . . . . . . . . . . . . .   4
     3.2.  Radio Channel Busy Data Item  . . . . . . . . . . . . . .   4
     3.3.  Radio Channel Rx Data Item  . . . . . . . . . . . . . . .   5
     3.4.  Radio Channel Tx Data Item  . . . . . . . . . . . . . . .   6
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
     5.1.  Extension Type Value  . . . . . . . . . . . . . . . . . .   6
     5.2.  Data Item Value . . . . . . . . . . . . . . . . . . . . .   7
   6.  Normative References  . . . . . . . . . . . . . . . . . . . .   7
   7.  Informative References  . . . . . . . . . . . . . . . . . . .   7
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   The Dynamic Link Exchange Protocol (DLEP) is defined in [RFC8175].
   It provides the exchange of link-related control information between
   DLEP peers.  DLEP peers are comprised of a modem and a router.  DLEP
   defines a base set of mechanisms as well as support for possible
   extensions.  This document defines one such extension.  Radio channel
   utilization provides a packet/frame independent measurement how a
   radio channel is used and how much resources are still available.
   While incoming and outgoing traffic can be easily measured on the
   router, the amount of airtime used by management traffic of the radio
   is invisible to the router, as is unicast traffic between two
   adjecant radios (unless the radio supports promiscous mode).  This
   could present the a fully utilized radio channel to the router as
   totally empty.  Getting a direct radio level information how much
   time on the radio channel has been used up by incoming or outgoing
   data or control frames allows a router to calculate a better routing
   metric or allows management agents to detect a channel being unusable
   for communication because of external jamming.

1.1.  Requirements Language

   In many IETF documents, several words, when they are in all capitals
   as shown below, are used to signify the requirements in the
   specification.  These capitalized words can bring significant clarity
   and consistency to documents because their meanings are well defined.
   This document defines how those words are interpreted in IETF
   documents when the words are in all capitals.

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   *  These words can be used as defined here, but using them is not
      required.  Specifically, normative text does not require the use
      of these key words.  They are used for clarity and consistency
      when that is what's wanted, but a lot of normative text does not
      use them and is still normative.

   *  The words have the meanings specified herein only when they are in
      all capitals.

   *  When these words are not capitalized, they have their normal
      English meanings and are not affected by this document.

   Authors who follow these guidelines should incorporate this phrase
   near the beginning of their document: The key words "MUST", "MUST
   NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT",
   "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in BCP 14 [RFC2119]
   [RFC8174] when, and only when, they appear in all capitals, as shown
   here.

2.  Extension Usage and Identification

   The use of the Channel Utilization Extension SHOULD be configurable.
   To indicate that the Channel Utilization Extension is to be used, an
   implementation MUST include the Radio Channel Utilization Extension
   ID in the Extensions Supported Data Item.  The Extensions Supported
   Data Item is sent and processed according to [RFC8175].

   All four Data Items are time measurements in nanoseconds since an
   arbitrary starting point, e.g. the radio bootup.  They are never
   reseted and will just increase monotonic.

   The first Data Item (Radio Channel Active) announces the channels
   livetime of the radio channel while the other three provide the
   amount of time the channel has been used in different ways.  Radio
   Channel Rx provides the time the radio is receiving data, Radio
   Channel Tx the time the radio is sending data and Radio Channel Busy
   the time the radio channel is blocked for any unknown reason.

   A radio that doesn't track the time for receiving and transmitting
   data explicitly can just add all times the radio channel is not free
   into the Radio Channel Busy Data Item.

   The time the radio channel has been free can be calculated by
   substracting the values of Busy, Rx and Tx from the value provided by
   the Radio Active Channel Data Item.  By tracking these values over
   time The router can calculate statistics on the channel usage for
   routing metrics or report the received value to a management layer.

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3.  Data Items

   All four Data Items of this extension can be used both as Session
   specific and Destination specific metrics.  If the radio is only
   tracking channel usage on interface level, the Data Items are used in
   SessionInitResponse and SessionUpdate messages.  If the radio also is
   tracking channel usage for each Destination, they are also used in
   DestinationUp, DestinationUpdate and DestinationAnnounceResponse
   messages.

3.1.  Radio Channel Active Data Item

   Radio Channel Active Item contains information how long the radio
   channel has been active.  This provides the router with a reference
   to interpret the values provided by the other three Data Items.
   Because of this the value in this item must be larger than the values
   in the other three Data Items this extensions defines together.

   This Data Item is mandatory for SessionInitResponse messages.

   The format of the Radio Channel Active Data Item is:

   0                   1                   2                   3
   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Data Item Type                | Length                        |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                          Active Time                          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                          Active Time                          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                                  Figure 1

   Data Item Type:  TBD

   Length:  8

   Active Time:  Time in nanoseconds since the channel has been active.

3.2.  Radio Channel Busy Data Item

   Radio Channel Busy Item contains information how much time the radio
   channel has been busy, not including the time provided in the Channel
   Rx and Chanel Tx Data Item.

   The format of the Radio Channel Busy Data Item is:

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   0                   1                   2                   3
   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Data Item Type                | Length                        |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                           Busy Time                           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                           Busy Time                           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                                  Figure 2

   Data Item Type:  TBD

   Length:  8

   Busy Time:  Time in nanoseconds the channel was busy during its
      active time.

3.3.  Radio Channel Rx Data Item

   Radio Channel Rx Item contains information how much time the local
   radio has been receiving data from other radios.

   The format of the Radio Channel Rx Data Item is:

   0                   1                   2                   3
   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Data Item Type                | Length                        |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                            Rx Time                            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                            Rx Time                            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                                  Figure 3

   Data Item Type:  TBD

   Length:  8

   Rx Time:  Time in nanoseconds the local radio was receiving data from
      other radios during its active time.

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3.4.  Radio Channel Tx Data Item

   Radio Channel Tx Item contains information how much time the local
   radio has been transmitting data to other radios.

   The format of the Radio Channel Tx Data Item is:

   0                   1                   2                   3
   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Data Item Type                | Length                        |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                            Tx Time                            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                            Tx Time                            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                                  Figure 4

   Data Item Type:  TBD

   Length:  8

   Tx Time:  Time in nanoseconds the local radio was transmitting data
      to other radios during its active time.

4.  Security Considerations

   The extension introduces a new Data Item for DLEP.  The extension
   does not inherently introduce any additional vulnerabilities above
   those documented in [RFC8175].  The approach taken to security in
   that document applies equally when running the extension defined in
   this document.

5.  IANA Considerations

   As described below, IANA has assigned two values per this document.
   Both assignments are to registries defined by [RFC8175].

5.1.  Extension Type Value

   IANA has assigned the following value in the "Extension Type Values"
   registry within the "Dynamic Link Exchange Protocol (DLEP)
   Parameters" registry.  The new value is in the range with the
   "Specification Required" [RFC8126] policy:

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                   +------+---------------------------+
                   | Code | Description               |
                   +------+---------------------------+
                   | TBD  | Radio Channel Utilization |
                   +------+---------------------------+

                    Table 1: New Extension Type Value

5.2.  Data Item Value

   IANA has assigned the following value in the "Data Item Type Values"
   registry within the "Dynamic Link Exchange Protocol (DLEP)
   Parameters" registry.  The new value is in the range with the
   "Specification Required" [RFC8126] policy:

                   +-----------+----------------------+
                   | Type Code | Description          |
                   +-----------+----------------------+
                   | TBD       | Radio Channel Active |
                   +-----------+----------------------+
                   | TBD       | Radio Channel Busy   |
                   +-----------+----------------------+
                   | TBD       | Radio Channel Rx     |
                   +-----------+----------------------+
                   | TBD       | Radio Channel Tx     |
                   +-----------+----------------------+

                       Table 2: New Data Item Value

6.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

   [RFC8175]  Ratliff, S., Jury, S., Satterwhite, D., Taylor, R., and B.
              Berry, "Dynamic Link Exchange Protocol (DLEP)", RFC 8175,
              DOI 10.17487/RFC8175, June 2017,
              <https://www.rfc-editor.org/info/rfc8175>.

7.  Informative References

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   [RFC8126]  Cotton, M., Leiba, B., and T. Narten, "Guidelines for
              Writing an IANA Considerations Section in RFCs", BCP 26,
              RFC 8126, DOI 10.17487/RFC8126, June 2017,
              <https://www.rfc-editor.org/info/rfc8126>.

Author's Address

   Henning Rogge
   Fraunhofer FKIE
   Fraunhofer Strasse 20
   53343 Wachtberg
   Germany
   Email: henning.rogge@fkie.fraunhofer.de

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