ISO/IEC 15045-2:2012

Information technology — Home Electronic System (HES) gateway — Part 2: Modularity and protocol

ISO/IEC 15045-2:2012(E) specifies a gateway architecture that provides an interconnection between one or more Wide Area Networks (WANs) and one or more Home Area Networks (HANs). It is not needed for a "simple gateway" linking one WAN to one HAN where there is no intention of future expansion. It applies to a "distributed gateway," and is also referred to in ISO/IEC 15045-1 as the Complex Modular Gateway. Also, it specifies how separate gateways in a single house can interoperate to provide co-ordinated functions.

Technologies de l'information — Entrée des systèmes électroniques domestiques (HES) — Partie 2: Modularité et protocole

General Information

• Status: Published
• Publication Date: 12-Jul-2012
• ICS: 35.200 - Interface and interconnection equipment
• ICS: 35.240.99 - IT applications in other fields
• Technical Committee: ISO/IEC JTC 1/SC 25 - Interconnection of information technology equipment
• Drafting Committee: ISO/IEC JTC 1/SC 25 - Interconnection of information technology equipment
• Current Stage: 9093 - International Standard confirmed
• Completion Date: 06-Dec-2017

Standards Content (Sample)

ISO/IEC 15045-2
Edition 1.0 2012-07
INTERNATIONAL
STANDARD

colour
inside


Information technology – Home electronic system (HES) gateway –
Part 2: Modularity and protocol

ISO/IEC 15045-2:2012(E)

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ISO/IEC 15045-2


Edition 1.0 2012-07




INTERNATIONAL



STANDARD








colour

inside










Information technology – Home electronic system (HES) gateway –

Part 2: Modularity and protocol



























INTERNATIONAL

ELECTROTECHNICAL

COMMISSION

PRICE CODE
P


ICS 35.200 ISBN 978-2-83220-190-9



  Warning! Make sure that you obtained this publication from an authorized distributor.

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– 2 – 15045-2 © ISO/IEC:2012(E)
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 8
3 Terms, definitions and abbreviations . 8
3.1 Terms and definitions . 8
3.2 Abbreviations . 11
4 Conformance . 12
5 Architecture . 12
5.1 Architectural model . 12
5.2 Design philosophy . 14
5.2.1 General approach . 14
5.2.2 Distributed gateway system (DGS) . 14
5.2.3 Modularity . 15
5.2.4 Common interoperability platform . 15
6 Modularity requirements . 15
7 HES-gateway system . 16
7.1 Conceptual process model . 16
7.1.1 Common interoperability framework (CIF) . 16
7.1.2 Generic interworking function (GIWF) . 17
7.2 Physical architecture . 17
7.3 Modularity . 18
7.3.1 General . 18
7.3.2 WAN access module . 19
7.3.3 HAN access module . 21
7.3.4 Service module . 22
7.4 Data flows . 23
7.4.1 General . 23
7.4.2 Control plane . 24
7.4.3 Content (data) plane . 24
8 Intermediate processes . 24
8.1 General . 24
8.2 Protocol stacks . 24
8.2.1 Generalised model . 24
8.2.2 Specific model – Simple gateway. 25
8.2.3 GIWF application . 26
8.2.4 Data flow control plane signalling . 26
8.3 Intermediate bus (GL bus) and protocol (GL protocol) . 27
8.3.1 General . 27
8.3.2 Lower layers . 27
8.3.3 Middle layers . 27
8.3.4 Upper layers . 27
8.4 Gateway management . 28
Annex A (informative) Case examples . 29
A.1 Overview of case examples . 29

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15045-2 © ISO/IEC:2012(E) – 3 –
A.2 VDSL scenario . 29
A.3 DBS/DSL scenario . 30
A.4 Healthcare management scenario . 31
A.5 DSL/HomePNA scenario . 31
Annex B (informative) Intermediate logical bus topologies . 33
B.1 Overview of intermediate bus topologies . 33
B.2 Mesh topology . 33
B.3 Star topology . 33
B.4 Combined mesh and star topology . 34
Annex C (informative) Distributed gateway extension methods . 35
Bibliography . 36

Figure 1 – Options for home-gateway configurations . 8
Figure 2 – Interoperating networks and domain of HES-gateway standard . 13
Figure 3 – Alternative distributed modular architectural models. 14
Figure 4 – Common interoperability framework (CIF) . 17
Figure 5 – HES-gateway architectural domains . 18
Figure 6 – HES-link module linkage model . 19
Figure 7 – WAN access module block diagram . 20
Figure 8 – HAN access module block diagram . 21
Figure 9 – Service module block diagram . 22
Figure 10 – Data flows . 23
Figure 11 – HES-gateway generalised protocol stack model . 25
Figure 12 – HES-gateway special case: simple gateway protocol stack model . 26
Figure A.1 – VDSL scenario . 29
Figure A.2 – DBS/DSL scenario . 30
Figure A.3 – Cable/DSL/energy management/ZigBee scenario . 30
Figure A.4 – Healthcare management scenario . 31
Figure A.5 – DSL/HomePNA Scenario . 31
Figure B.1 – Mesh topology . 33
Figure B.2 – Star topology . 34
Figure B.3 – Combined mesh and star topology . 34
Figure C.1 – HES-gateway GL bus extension methods . 35

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INFORMATION TECHNOLOGY –
HOME ELECTRONIC SYSTEM (HES) GATEWAY –

Part 2: Modularity and protocol


FOREWORD
1) ISO (International Organization for Standardization) and IEC (International Electrotechnical Commission) form the
specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in
the development of International Standards. Their preparation is entrusted to technical committees; any ISO and
IEC member body interested in the subject dealt with may participate in this preparatory work. International
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2) In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.
Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote.
3) The formal decisions or agreements of IEC and ISO on technical matters express, as nearly as possible, an
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9) Attention is drawn to the normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
10) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
International Standard ISO/IEC 15045-2 was prepared by subcommittee 25: Interconnection
of information technology equipment, of ISO/IEC joint technical committee 1: Information
technology.
The list of all currently available parts of the ISO/IEC 15045 series, under the general title
Information technology – Home electronic system (HES) gateway, can be found on the IEC
web site.
This International Standard has been approved by vote of the member bodies, and the voting
results may be obtained from the address given on the second title page.

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15045-2 © ISO/IEC:2012(E) – 5 –
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
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INTRODUCTION
As the market has developed for home systems, the number of communications protocols for
home networks and for access to the home has increased. This has occurred even while
ISO/IEC standards for these networks have been developed and published. Continuing
technological progress also suggests that such proliferation will persist, and that no single
technology or standard is likely to prevail.
Therefore, standards to enable interoperability among applications implemented on
incompatible networks are being written. This standard addresses the gateway, which
provides an interconnection between an access network (a wide area network) and one or
more home networks (home area networks).
This standard is part of a series of standards and technical reports for the Home Electronic
System (HES) that deal with the topic of control and communication networks in homes and
small buildings. ISO/IEC 15045-1, published in 2004, defines a basic model of the residential
gateway, including functional requirements.
This standard defines a common framework for implementing gateway platforms to achieve
interconnection and interoperability of home system products and applications. The objective
is to support products from any manufacturer or provider in a manner that is safe, reliable,
predictable and consistent. Service providers such as cable TV companies, Internet service
providers and telephone companies are each installing a gateway to deliver digital data and
audio/video streams, therefore some houses contain multiple gateways. As a consequence,
an optional feature of this standard specifies how to interconnect multiple gateways in one
house so that these gateways can co-ordinate service offerings.
A communications gateway provides an interconnection between a wide area network (WAN)
and local area network (LAN) where the protocols on each network differ. The gateway is
responsible for protocol translation of signals, message formats and timing. The home
systems industry has adapted LAN technology for Home Area Networks (HANs). Ideally, each
home system would be based on one HAN and all attached devices and appliances would use
one communications protocol. In reality, multiple incompatible HAN technologies are being
marketed. Also, each service provider is installing a separate gateway (e.g., DSL, cable
broadband and satellite). Therefore, it is possible that a user will purchase and install
products employing two (or more) dissimilar HANs within the same premises. These HANs
may be connected to WANs via separate incompatible gateways. However, the user expects
these products and networks to behave as if they were the same logical network in order to
deliver home services, such as:
• entertainment (audio/video);
• data/internet access;
• communication (telephony);
• energy management;
• health care and monitoring;
• environmental control (heating and cooling);
• security and safety monitoring;
• appliance telemetry;
• lighting control.
This standard accomplishes interoperability by specifying a modular architecture and set of
protocols for interconnecting the modular elements with a common signalling bus. It relies on
a common intermediate language to achieve interoperability among applications called the
Common Interoperability Framework (HES-CIF), described in this standard. Parts of
ISO/IEC 18012 define the network-specific interworking functions needed to provide
conforming products.

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15045-2 © ISO/IEC:2012(E) – 7 –
This International Standard defines a universal gateway system by specifying interfaces
between
• standalone local/Home Area Networks (HANs) and connected devices,
• multiple implementations of local/home area networks (HANs) and connected devices,
• Wide Area Networks (WANs) (also known as access networks) and applications connected
to Home Area Networks (HANs) and connected devices.
This standard establishes a framework for implementation of a general-purpose
interoperability platform or “translator” among home area networks or between wide area
networks and home area networks. It represents one approach to implementation of the
interoperability standard ISO/IEC 18012. This standard does not attempt to specify a central
controller or control system; and does not attempt to improve or resolve disparities or
shortcomings among transmission technologies, protocols, or application languages.
However, this standard does provide the premises with a platform for supporting any number
of specific services and supporting fundamental elements of consumer security (i.e., firewall
services), safety and privacy.
This standard is not a design for a specific gateway, but rather it offers an architecture, and
therefore it is necessarily abstract. However, this standard is relevant for many commercial
gateway configurations. Examples of such implementations are included for information in
Annex A.
Summing up, this standard shows how to build a gateway out of modular building blocks. This
International Standard does not describe or specify gateway applications, service
requirements, network topologies, or how gateways are to be applied within home networks
and systems. These specifications are left to other home gateway-related standards.

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INFORMATION TECHNOLOGY –
HOME ELECTRONIC SYSTEM (HES) GATEWAY –

Part 2: Modularity and protocol



1 Scope
This part of ISO/IEC 15045 specifies a gateway architecture that provides an interconnection
between one or more Wide Area Networks (WANs) and one or more Home Area Networks
(HANs). This standard is not needed for a “simple gateway” linking one WAN to one HAN
where there is no intention of future expansion, as illustrated in Figure 1. The scope of this
standard applies to a “distributed gateway,” as illustrated in Figure 1 and is also referred to in
ISO/IEC 15045-1 as the Complex Modular Gateway. Also, this standard specifies how
separate gateways in a single house can interoperate to provide co-ordinated functions.
WAN 1
HAN 1
Gateway
WAN HAN
Gateway
WAN 2 HAN 2
Gateway
WAN 3 HAN 3
Gateway
Simple gateway Distributed gateway


Figure 1 – Options for home-gateway configurations
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
ISO/IEC 18012-2:—, Information technology – Home electronic system (HES) – Guidelines for
1
product interoperability – Part 2: Taxonomy and application interoperability model
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
___________
1
 To be published.

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15045-2 © ISO/IEC:2012(E) – 9 –
3.1.1
appliance
apparatus intended for household or similar use
[SOURCE: IEC 60050-151:2001, 151-11-23]
Note 1 to entry: For example a clothes washer, water heater, television, inverter, etc.
3.1.2
bridge
interface between dissimilar lower layer networks
Note 1 to entry: A bridge may provide services at layer 1 (physical layer) or layer 2 (data link layer).
3.1.3
bus
common or shared communication path or highway
Note 1 to entry: A bus is a means of interconnecting devices under a single administration, such as a LAN
comprising devices sharing a common set of pathways.
Note 2 to entry: A distinction may be drawn between “logical” and “physical” buses when bus topologies are
considered.
3.1.4
common interoperability framework
CIF
abstract intermediate language expressions for tranlating HAN or WAN-specifid messages
Note 1 to entry: A common interoperability framework includes
a) an HES-AIL (Abstract Intermediate Language) and
b) a set of network-specific Generic Interworking Function (GIWF) processes to express (i.e., translate) any
message to or from any specific HAN or WAN message
3.1.5
compatibility
ability of two or more networks within a premises to be mutually tolerant and that do not
interfere with one another
Note 1 to entry: The networks are co-existent, but they are not necessarily interoperable.
3.1.6
component
logical subunit of a larger, encompassing concept
Note 1 to entry: For example, the concept of interoperability is subdivided into constituent components such as
safety, management and operation. These constituent components are further subdivided within their respective
sections. In the context of the HES-gateway, the term component is also used to refer to logical subunits of system
architecture concepts, such as the components of a networking implementation (e.g., addressing).
3.1.7
device
distinct physical unit on a network
Note 1 to entry: A device can either be an end node on the network, or an intermediate node (as in the case of a
gateway, router, or bridge device connecting two distinct physical networks).
3.1.8
distributed gateway
HES-gateway implemented as separate but interconnected modular elements

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3.1.9
gateway
interface between dissimilar networks
Note 1 to entry: A gateway may provide services up to OSI layer seven and above.
Note 2 to entry: The HES-gateway provides protocol and language translation services above layer seven.
3.1.10
gateway link
GL
full seven-layer protocol stack and the physical bus internal to and specific to the HES-
gateway architecture to connect GL modules
Note 1 to entry: The GL is used to communicate the HES-AIL encoded messages (resulting from the GIWF
translation process) between HES-link modules and is not intended to link to end user devices. It is a link in the
sense that it transports messages within, or native to, the CIF (i.e., GL and HES-AIL). The GL may also be referred
to as the "HES-link".
3.1.11
generic interworking function
GIWF
translation function between a specific home network application language and the HES-AIL
(Abstract Intermediate Language) used within the HES-gateway system
3.1.12
HES abstract intermediate language
AIL
language to represent or express the messages of any HAN or WAN
Note 1 to entry: AIL is an intermediate HES-gateway-oriented application language that includes a syntactic
structure and semantic definitions comprising a lexicon of terms including objects and methods (actions).
3.1.13
HES-gateway
gateway conforming to ISO/IEC 15045-2
Note 1 to entry: The HES-gateway provides protocol and language translation services above layer seven in
conformance with this standard.
3.1.14
HES-link module
device that provides the required services for one of the networks of the HES-gateway system
Note 1 to entry: In the context of this standard, the HES-link module provides protocol and language translation
services above layer seven and provides an interface to the GL for purposes of connecting by the GL to one or
more other HES-link modules serving other networks. Two or more HES-link modules, connected together via a GL,
comprise a gateway.
3.1.15
home area network
HAN
network specifically serving nodes, devices, components and functions within a home or
premises
3.1.16
home electronic system
HES
collection of devices and components operating within the home and interconnected over one
or more networks, and within which such devices and networks are compatible and
interoperable according to various ISO/IEC standards

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15045-2 © ISO/IEC:2012(E) – 11 –
3.1.17
interface module
HES-link module that provides an interface to a particular HAN or WAN network
3.1.18
interoperability
ability of logical entities to function together for applications on a network or between multiple
networks
3.1.19
management information base
MIB
memory function in some portion of the gateway that stores information useful for various
network management functions
Note 1 to entry: No relationship is implied here with Simple Network Management Protocol (SNMP) from which
the term "MIB" is borrowed.
3.1.20
network
distinct interconnection or set of nodes or devices that share a common communication
protocol and are mutually compatible and interoperable
3.1.21
object
program or unit of software functionality
Note 1 to entry: This definition is similar to that traditionally used in object-oriented programming.
2
[SOURCE: ISO/IEC 18012-2:– , 3.1.27]
3.1.22
product
device or network of devices that may be purchased to make up a home electronic system
3.1.23
router
interface between dissimilar middle layer networks
Note 1 to entry: A router may provide services at layer 2 (data link layer) or l
...