Manet H.R. Rogge Internet-Draft Fraunhofer FKIE Intended status: Standards Track 23 July 2023 Expires: 24 January 2024 DLEP Radio Quality Extension draft-rogge-manet-dlep-radio-quality-03 Abstract This document defines an extension to the Dynamic Link Exchange Protocol (DLEP) to provide the quality of incoming radio signals. 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 24 January 2024. Copyright Notice Copyright (c) 2023 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/ license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. Rogge Expires 24 January 2024 [Page 1] Internet-Draft DLEP PHY quality July 2023 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Requirements Language . . . . . . . . . . . . . . . . . . 2 2. Extension Usage and Identification . . . . . . . . . . . . . 2 3. Radio Quality Data Items . . . . . . . . . . . . . . . . . . 2 3.1. Radio SNR Data Item . . . . . . . . . . . . . . . . . . . 3 3.2. Radio Signal Strength Data Item (also called RSSI) . . . 4 3.3. Radio Biterror Rate Data Item . . . . . . . . . . . . . . 5 3.4. Radio Noise Data Item . . . . . . . . . . . . . . . . . . 5 4. Security Considerations . . . . . . . . . . . . . . . . . . . 6 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6 5.1. Extension Type Value . . . . . . . . . . . . . . . . . . 6 5.2. Data Item Value . . . . . . . . . . . . . . . . . . . . . 6 6. Normative References . . . . . . . . . . . . . . . . . . . . 7 7. Informative References . . . . . . . . . . . . . . . . . . . 7 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 7 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. 1.1. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119]. 2. Extension Usage and Identification The use of the Radio Quality Extension SHOULD be configurable. To indicate that the Radio Quality Extension is to be used, an implementation MUST include the Radio Quality Extension Type Value in the Extensions Supported Data Item. The Extensions Supported Data Item is sent and processed according to [RFC8175]. The Radio Quality Extension Type Value is TBD; see Section TBD. 3. Radio Quality Data Items This section describes the quality related Data Items of this extension. Rogge Expires 24 January 2024 [Page 2] Internet-Draft DLEP PHY quality July 2023 All Data Items available in this extension provide access to the radios physical layer measurements related to signal quality. Because of different designs of Radio PHY layers, this quality can be expressed in different ways, by referring to signal-to-noise ratio or by measuring the biterror rate (e.g. by using a forward error correction). Both of these possible informations are very valuable for calculating MANET metrics for radio networks with moving nodes and low datarates, e.g. VHF radio networks. Estimating channel quality based on packet loss can be impractical, because the estimated value changes too fast (because of movement) compared to the number of received frames. Signal Strength (or Biterror rate) can provice the additional information necessary to build a reasonable stable and agile metric. In this usecase Biterror rate is normally the preffered way (compared to signal-to-noise ratio) because its easier to compare between different types of radio waveforms. 3.1. Radio SNR Data Item Radio SNR Data Item contains information which signal to noise ratio the radio measured. This Data Item can be both interface and neighbor specific. The format of the Radio SNR 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 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | SNR | Flags | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 1 Data Item Type: TBD Length: 3 SNR: SNR measured in dB multiplied by 10 as a signed integer. Flags: Flags field as defined below. The Flags field is defined as: Rogge Expires 24 January 2024 [Page 3] Internet-Draft DLEP PHY quality July 2023 0 1 2 3 4 5 6 7 +-+-+-+-+-+-+-+-+ | Reserved |I| +-+-+-+-+-+-+-+-+ Figure 2 I: Interference Flag, indicating the the data includes interference into the noise value (SINR). Reserved: MUST be zero. Left for future assignment. 3.2. Radio Signal Strength Data Item (also called RSSI) Radio Signal Strength Data Item contains information which absolute signal strength the radio measured. This Data Item can be both interface and neighbor specific. This Data Item could also be used together with the Request Link Characteristics message to reconfigure the outgoing signal strength, either to reduce the size of the collision domain or to increase the range of the radio. The format of the Radio Signal Strength 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 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Signal | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 3 Data Item Type: TBD Length: 2 Signal: Signal Strength measured in dBm multiplied by 10 as a signed integer. Rogge Expires 24 January 2024 [Page 4] Internet-Draft DLEP PHY quality July 2023 3.3. Radio Biterror Rate Data Item Radio Biterror Rate Data Item contains information about the radio receivers estimate how often a transmitted bit will be received wrong. This value can often be either directly measured by the radio by comparing the result of a forward-error-correction to the original received data or calculated from the received signal-to-noise ratio and knowledge about the current modulation coding scheme. This Data Item can be both interface and neighbor specific. The format of the Radio Biterror Rate 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 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Biterror | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 4 Data Item Type: TBD Length: 1 Biterror: Biterror rate measured as a negative exponent to base 10, e.g. "4" for an error rate of 1 to 10^-4. An error rate of 0 is encoded with a 255. 3.4. Radio Noise Data Item Radio Noise Data Item contains information which absolute noise value the radio measured. This Data Item SHOULD be interface specific. The format of the Radio Noise 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 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Noise | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 5 Data Item Type: TBD Rogge Expires 24 January 2024 [Page 5] Internet-Draft DLEP PHY quality July 2023 Length: 2 Noise: Noise measured in dBm multiplied by 10 as a signed integer. 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: +------+---------------+ | Code | Description | +------+---------------+ | TBD | Radio Quality | +------+---------------+ 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: Rogge Expires 24 January 2024 [Page 6] Internet-Draft DLEP PHY quality July 2023 +-----------+---------------------+ | Type Code | Description | +-----------+---------------------+ | TBD | Radio SNR | +-----------+---------------------+ | TBD | Radio Signal | +-----------+---------------------+ | TBD | Radio Biterror Rate | +-----------+---------------------+ | TBD | Radio Noise | +-----------+---------------------+ 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, . [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, . 7. Informative References [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, . Author's Address Henning Rogge Fraunhofer FKIE Fraunhofer Strasse 20 53343 Wachtberg Germany Email: henning.rogge@fkie.fraunhofer.de Rogge Expires 24 January 2024 [Page 7]