IEEE 802.21 Overview
draft-zuniga-mif-802-21-overview-00
The information below is for an old version of the document.
| Document | Type |
This is an older version of an Internet-Draft whose latest revision state is "Expired".
|
|
|---|---|---|---|
| Authors | Juan-Carlos Zúñiga , Pierrick Seite | ||
| Last updated | 2013-02-18 | ||
| RFC stream | (None) | ||
| Formats | |||
| Additional resources | |||
| Stream | Stream state | (No stream defined) | |
| Consensus boilerplate | Unknown | ||
| RFC Editor Note | (None) | ||
| IESG | IESG state | I-D Exists | |
| Telechat date | (None) | ||
| Responsible AD | (None) | ||
| Send notices to | (None) |
draft-zuniga-mif-802-21-overview-00
MIF WG JC. Zuniga
Internet-Draft InterDigital Communications, LLC
Intended status: Informational P. Seite
Expires: August 22, 2013 France Telecom - Orange
February 18, 2013
IEEE 802.21 Overview
draft-zuniga-mif-802-21-overview-00.txt
Abstract
Some of the messages described in [I-D.ietf-mif-api-extension] may
rely on functionalties provided by lower layers. The IEEE 802.21
specification defines an abstraction of lower layer functions that
can be useful for the MIF-API. This document provides an overview of
the 802.21 specification and enumerates a subset of functions that
can be used in the context of the MIF API to interact with lower
layers.
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 http://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 August 22, 2013.
Copyright Notice
Copyright (c) 2013 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
(http://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
Zuniga & Seite Expires August 22, 2013 [Page 1]
Internet-Draft IEEE 802.21 Overview February 2013
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 . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. IEEE 802.21 Framework . . . . . . . . . . . . . . . . . . . . 4
3. Security Considerations . . . . . . . . . . . . . . . . . . . 8
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 10
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 12
Zuniga & Seite Expires August 22, 2013 [Page 2]
Internet-Draft IEEE 802.21 Overview February 2013
1. Introduction
[I-D.ietf-mif-api-extension] describes an abstract API that provides
commands and services for applications and higher layer APIs running
on a terminal with more than one interface.
There is currently a need to present a coherent connection management
behaviour for different terminal platforms (e.g. mobile phones, PCs,
tablets, etc.), as users often experience a very different behaviour
when connecting with various platforms to the same networks and for
the same purposes (e.g. web browsing, email access, dedicated
applications, etc.).
The IEEE 802.21 specification [IEEE802.21] defines several media
independent services that can be used by higher layers (e.g., L3 and
above) to interact with lower layers (e.g., L2 and below). This
document provides an overview of the IEEE 802.21 specification,
focusing on the relevant functions from the MIF-API point of view.
Zuniga & Seite Expires August 22, 2013 [Page 3]
Internet-Draft IEEE 802.21 Overview February 2013
2. IEEE 802.21 Framework
Some of the connection management services described in
[I-D.seite-mif-cm] may rely on standardized abstraction layers such
as the IEEE 802.21 framework [IEEE802.21].
The IEEE 802.21-2008 Media Independent Handover (MIH) Services
baseline specification defines three type of services: Information
Services (IS), Event Services (ES) and Command Services (CS). Each
one of these services has a different purpose. The IS provides
information about existing networks and services in a potential
target network. The ES provides triggers, measurements and events
from lower layers (e.g. network access layers) that can be used for
instance to proactively trigger actions like a handing over or
establishing connection to a new network. The CS allows configuring
lower layer interfaces and events. Both ES and CS provide an
abstraction layer to upper layers that allows configuring and
interacting with different types of network link interfaces in a
coherent manner.
In 802.21 teminology, the 802.21 functionalities are perfomed by the
MIH Function. This MIH Function is in charge of providing services
to the MIH User, which is a higher layer entity (e.g., L3 and above).
Functions are applied to specific Link Layers, which are lower layer
entities (e.g., L2 and below). The basics of the 802.21 ES/CS flow
are depicted in Figure 1.
MIH User MIH Function Link Layer
| | |
| | |
| | |
| subcribe.request | |
|------------------->|----------->|
| subcribe.confirm | |
|<-------------------|<-----------|
| | |
| | |
| | event occurs
| event.notif | |
|<-------------------|<-----------|
| | |
| command.request | |
|------------------->|----------->|
| | Link command
| command.confirm | Execution
|<-------------------|<-----------|
Zuniga & Seite Expires August 22, 2013 [Page 4]
Internet-Draft IEEE 802.21 Overview February 2013
| | |
Figure 1: IEEE 802.21 event and command services flow
An MIH user may use the following IEEE 802.21 events and commands to
complete connection management operations:
Link_Event_Subscribe
Category: command
Description: Subscribe to one or more events from a link.
Link_Event_Unsubscribe
Category: command
Description: Unsubscribe from a set of link-layer events.
Link_Parameters_Report
Category: Event
Description: Link parameters have crossed a specified threshold
and need to be reported.
Link_Get_Parameters
Category: command
Description: Get parameters measured by the active link, such as
signal-to-noise ratio (SNR), BER, received signal strength
indication (RSSI).
Link_Detected
Category: Event
Description: Link of a new access network has been detected.
Link_Up
Category: Event
Description: L2 connection is established and link is available
for use.
Zuniga & Seite Expires August 22, 2013 [Page 5]
Internet-Draft IEEE 802.21 Overview February 2013
Link_Down
Category: Event
Description: L2 connection is broken and link is not available for
use.
Link_Going_Down
Category: Event
Description: Radio link conditions are degrading and connection
loss is very likely.
Link_Handover_Imminent
Category: Event
Description: L2 handover is imminent based on either the changes
in the link conditions or additional information available at
layer 2.
Link_Handover_Complete
Category: Event
Description: L2 handover has been completed.
Link_PDU_Transmit_Status
Category: Event
Description: indicate transmission status of a PDU.
Link_Capability_Discover
Category: command
Description: Query and discover the list of supported link-layer
events and link-layer commands.
Link_Configuration_Thresholds
Category: command
Description: Configure thresholds for future Link Parameters
Report events.
Zuniga & Seite Expires August 22, 2013 [Page 6]
Internet-Draft IEEE 802.21 Overview February 2013
Link_Action
Category: command
Description: request an action on a link-layer connection, e.g.
perform a scan, shut down an interface, etc.
Handover_Query
Category: command
Description: query and obtain handover related information about
possible candidate target networks.
Handover_Commit
Category: command
Description: notify the MIH function of the decided target
network.
Handover_Complete
Category: command
Description: indicate the status of the handover completion to the
MIH function.
Zuniga & Seite Expires August 22, 2013 [Page 7]
Internet-Draft IEEE 802.21 Overview February 2013
3. Security Considerations
TBD.
Zuniga & Seite Expires August 22, 2013 [Page 8]
Internet-Draft IEEE 802.21 Overview February 2013
4. IANA Considerations
This document has no actions for IANA.
Zuniga & Seite Expires August 22, 2013 [Page 9]
Internet-Draft IEEE 802.21 Overview February 2013
5. Acknowledgements
The authors would like to express their gratitude to Ralph Droms, Ted
Lemon, Dave Thaler and Subir Das for the fruitful discussions
regarding 802.21, MIF API and connection managers.
Zuniga & Seite Expires August 22, 2013 [Page 10]
Internet-Draft IEEE 802.21 Overview February 2013
6. References
[I-D.ietf-mif-api-extension]
Liu, D., Lemon, T., and Z. Cao, "MIF API consideration",
draft-ietf-mif-api-extension-03 (work in progress),
November 2012.
[I-D.seite-mif-cm]
Seite, P. and J. Zuniga, "MIF API Conn Mngr
Considerations", draft-seite-mif-cm-00 (work in progress),
September 2012.
[IEEE802.21]
IEEE, "IEEE Standard for Local and Metropolitan Area
Networks - Part 21: Media Independent Handover Services",
IEEE LAN/MAN Std 802.21-2008, January 2009.", 2009, < http
://www.ieee802.org/21/private/Published%20Spec/
802.21-2008.pdf>.
Zuniga & Seite Expires August 22, 2013 [Page 11]
Internet-Draft IEEE 802.21 Overview February 2013
Authors' Addresses
Juan Carlos Zuniga
InterDigital Communications, LLC
1000 Sherbrooke Street West, 10th floor
Montreal, Quebec H3A 3G4
Canada
Email: JuanCarlos.Zuniga@InterDigital.com
Pierrick Seite
France Telecom - Orange
4, rue du Clos Courtel, BP 91226
Cesson-Sevigne 35512
France
Email: pierrick.seite@orange.com
Zuniga & Seite Expires August 22, 2013 [Page 12]