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ALTO                                                      S. Randriamasy
Internet-Draft                                           Nokia-Bell-labs
Intended status: Experimental                          December 15, 2017
Expires: June 18, 2018


                        ALTO cellular addresses
              draft-randriamasy-alto-cellular-adresses-01

Abstract

   This draft proposes to use the cellular address format composed of
   elements as specified by 3GPP and called ECGI.  ECGI stands for
   E-UTRAN Cell Global Identifier and is used in Public Land Mobile
   Networks based on E-UTRAN.

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 RFC 2119 [RFC2119].

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 June 18, 2018.

Copyright Notice

   Copyright (c) 2017 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



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   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Relevant ALTO services and documents  . . . . . . . . . . . .   3
   3.  Proposed format for ALTO cell identifiers . . . . . . . . . .   3
     3.1.  Relation of ALTO Cell Id format to endpoint address
           format  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.2.  ALTO address type for cellular networks . . . . . . . . .   3
     3.3.  Endpoint address canonical string format  . . . . . . . .   4
     3.4.  ALTO Cell Id formats  . . . . . . . . . . . . . . . . . .   4
     3.5.  Examples  . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Appendix A.  An Appendix  . . . . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   Cellular networks are present in a number of use cases investigated
   in the ALTO WG and it is useful to specify a format for Cellular
   addresses.  In these cases, Endpoints, PIDs and entities may be
   cells.  In order to specify services such as Network Maps, Cost Maps,
   Endpoint property or Property Maps, it is necessary to order to
   specify an ALTO format for Cell addresses.

   For the sake of efficiency, a preferred option is to use the cell
   identifier format as specified by 3GPP [TS 36.300] and called ECGI,
   as already proposed in [draft-rauschenbach-alto-wireless-access-00]
   and in other discussions.  ECGI stands for E-UTRAN Cell Global
   Identifier and is used in Public Land Mobile Networks based on
   E-UTRAN, see [TS 36.331].

   The purpose of this document is to be completed by the ALTO WG and in
   particular:

   - Amend and finalize the specification for the ALTO Cell identifier
   format proposed in the present version,




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   - define a placeholder for this specification and identify impacted
   documents.

2.  Relevant ALTO services and documents

   Particular services and drafts where an ALTO address type for
   cellular networks is needed include:

   o  - Endpoint property service: extended to allow endpoints to be
      cells on which properties can be requested,

   o  - (Filtered) Cost Map Service: where PIDs can be cells within and
      among which cost values can be requested, see also[draft-
      randriamasy-alto-cost-context-01],

   o  - "Mobility Network Models in ALTO" defined in [draft-bertz-alto-
      mobilitynets] propose to identify network points of attachment
      (PoA) such as cells to PIDs.

   o  - "ALTO Performance Cost Metrics": being defined in [draft-ietf-
      alto-performance-metrics-01], they will be extended to performance
      costs in cellular networks,

   o  - "Extensible Property Maps for the ALTO Protocol", being defined
      in [draft-ietf-alto-unified-props-new] will cover entities that
      may be cells which are identified by their addresses.  In this
      document a domain identifier for cells will need to be accordingly
      defined, and the entity domain identifier "ecgi" is proposed.

3.  Proposed format for ALTO cell identifiers

3.1.  Relation of ALTO Cell Id format to endpoint address format

   RFC7285 specifies endpoint address formats for ipv4 and ipv6 and the
   purpose of this draft is to agree on a format for cellular endpoints.
   When a cell is mapped to a PID, say "MyCell3" the ALTO Cell Id will
   be used to specify the endpoints within this PID.

   Whereas IP addresses are associated to domains ipv4 and ipv6, a Cell
   Id will be associated to the domain "ecgi".

3.2.  ALTO address type for cellular networks

   ECGI -- E-UTRAN Cell Global Identifier







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3.3.  Endpoint address canonical string format

   'ecgi:' MCC '.' MNC ':' ECI

   Where:

   o  MCC: Mobile Country Code, as assigned by ITU.  A 3 digits decimal
      number without leading zeros.

   o  MNC: Mobile Network Code, as assigned by National Authority.  A
      2-3 digits decimal number with or without leading zeros.

   o  ECI: E-UTRAN Cell Identifier.  A 7 digits lower-case hexadecimal
      number.

   Example:

   o  ecgi:940.978:1234abc

      *  MCC value 940 stands for country or geographical area
         "CountryC"

      *  MNC value 978 stands for Network N1 in CountryC and other
         networks in other countries

      *  A same MNC value, say 020 may be associated with several MCCs.

      *  Some MCCs have MNCs encoded with 2 digits and MNCs encoded with
         3 digits.

3.4.  ALTO Cell Id formats

   Three formats are proposed:

   o  'ecgi:' MCC

   o  'ecgi': MCC '.'  MNC

   o  'ecgi:' MCC '.'  MNC ':' ECI-MASK '/' MASK-LEN












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   where:
        MASK-LEN is a decimal number.
        ECI-MASK is a string of lower-case hex digits, of which
                 all but the first MASK-LEN bits are zero.

   Prefix ecgi:P-MCC.P-MNC:P-ECI/N matches ecgi:MCC.MNC:ECI iff
        MCC == P-MCC, and
        MNC == P-MNC, and
        ECI has the same number of hex digits as P-ECI, and
        the first N bits of ECI match those of P-ECI.

3.5.  Examples

   o  ecgi:940

      *  Matches every cell address with MCC 940.

   o  ecgi:940.978

      *  Matches every cell address with MCC 940 and MNC 978.

   o  ecgi:940.978:1234800/18

      *  Matches every cell address with MCC 940, MNC 978, and a 7-digit
         ECI that starts with the 18 bits 0x12348.  Thus it matches
         ecgi:940.978:1234abc but does not match ecgi:940.978:1234dbc.

4.  IANA Considerations

   This document currently makes no request of IANA.

   Note to RFC Editor: this section may be removed on publication as an
   RFC.

5.  Security Considerations

   TBC

6.  Acknowledgements

   Great thanks to Wendy Roome who initiated this document, Qin Wu, Li
   Geng and Yichen Qian for discussions.

7.  References







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7.1.  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>.

7.2.  Informative References

   [draft-ietf-alto-unified-props-new]
              Roome, W. and Y. Yang, "Extensible Property Maps for the
              ALTO Protocol (in progress)", July 2017.

Appendix A.  An Appendix

Author's Address

   Sabine Randriamasy
   Nokia-Bell-labs
   Route de Villejust
   Nozay  91460
   FRANCE

   Email: Sabine.Randriamasy@nokia-bell-labs.com



























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