Daniel,
It's good to see this work moving forward. However, the problem
statement and characterization of the 802.16 MAC that appears in the
charter is not correct:
* 802.16 is in fact capable of native multicasting in the downlink
(see for example 802.16e section 11.9.35)
* 802.16 has a built-in "802.3 Convergence Sublayer" which enables
the point-to-multipoint network to emulate a large LAN (with the
option of broadcast filtering). This faciliitates IPv6 operation
(including ND), but has the (possible) cost of some extra bytes of
overhead.
Below is an amended third paragraph:
" IEEE 802.16(e) is different from existing wireless access
technologies such as IEEE 802.11 or 3G. Accordingly, while
802.16
defines the encapsulation of an IP datagram in an IEEE 802.16 MAC
payload, complete description of IP operation is not present and can
benefit from IETF input and specification.
For example: immediately subsequent to network entry an 802.16
subscriber station has no capability whatsoever for data (as opposed
to management) connectivity. The criteria by which the Base Station
(or other headend elements) set up the 802.16 MAC connections for data
transport is not part of the 802.16 standard and depends on the type
of data services being offered (ie. the set up of transport
connections will be different for IPv4 and IPv6 services).
Additionally - as 802.16 is a point-to-multipoint network - an 802.16
subscriber station is not capable of broadcasting (eg. for neighbor
discovery) or direct communication to the other nodes in the network.
While the built-in LAN emulation feature of 802.16 ("802.3 Convergence
Sublayer") rectifies this, it may involve additional packet overhead.
As for fast mobility, the characteristics of IEEE 802.16e
link-layer
operation may require an amendment to the Fast Handover Mobile IPv6
scheme (RFC 4068), something which may be pursued in the MIPSHOP WG."
Regards,
- Jeff Mandin
Folks,
We would like to announce a BoF at the upcoming IETF,
leading to identify what limitations and considerations apply to IPv6
adoption over IEEE 802.16(e), and to propose available solutions. A
mailing list is set up at [EMAIL PROTECTED]
and a proposed description is below.
==============================
============
IPv6 over IEEE 802.16(e) Networks BoF (16ng)
CHAIRS:
Soohong Daniel Park<[EMAIL PROTECTED]>
Gabriel Montenegro<[EMAIL PROTECTED].com>
DESCRIPTION:
Broadband
Wireless Access Network addresses the inadequacies of low bandwidth
wireless communication for user requirements such as high quality
data/voice service, fast mobility, wide coverage, etc. The IEEE 802.16
Working Group on Broadband Wireless Access Standards develops standards
and recommended practices to support the development and deployment of
broadband Wireless Metropolitan Area Networks. In addition, IEEE
802.16e supports mobility over IEEE 802.16 as an amendment to the IEEE
802.16 specification.
Recently, much work is in progress by the
WiMAX Forum. In particular, its NWG (Network Working Group) is
responsible for the IEEE 802.16(e) network architecture (e.g., IPv4,
IPv6, Mobility, Interworking with different networks, AAA, etc). The
NWG is thus taking on work at layers above those defined by the IEEE
802 standards (typically limited to the physical and link layers only).
Similarly, WiBro (Wireless Broadband) is a Korean effort based on the
IEEE 802.16e specification which focuses on the 2.3 GHz spectrum band.
IEEE
802.16(e) is different from existing wireless access technologies such
as IEEE 802.11 or 3G. Accordingly, the use of IP over an IEEE
802.16(e) link is currently undefined, and will benefit from IETF input
and specification. For example, even though Neighbor Discovery has been
specified to work over point-to-point type links (e.g., as available in
3G), it applies most naturally to link technologies capable of native
multicasing. Thus, it is not yet clear how it would work over IEEE
802.16(e) networks. Even though these supports a PMP
(Point-to-Multipoint) mode, there is no provision for multicasting IP
packets, hindering the basic standard IPv6 operation. An IEEE 802.16(e)
connection for IP packet transfer is a point-to-point unidirectional
mapping between medium access control layers at the ubscriber station
and the base station. This eventually requires convergence protocols to
emulate the desired service on network entities such as base stations,
which may limit IPv6 features. As for fast mobility, the
characteristics of IEEE 802.16e link-layer operation may require an
amendment to the Fast Handover Mobile IPv6 scheme (RFC 4068), something
which may be pursued in the MIPSHOP WG.
The principal objective
of the 16ng BoF is to identify what limitations and considerations
apply to IPv6 adoption over IEEE 802.16(e), and to propose available
solutions. The working group may issue recommendations to IEEE
802.16(e) suggesting protocol modifications for better IP support.
In
2006, WiBro deployment will begin, and the WiMAX Forum is slated to
specify IPv6 operation over IEEE 802.16(e) in 2006. Accordingly, the
working group will work and coordinate with the WiMAX Forum and with
the WiBro efforts.
MAILING LIST:
General Discussion: [EMAIL PROTECTED]
To Subscribe: http://eeca16.sogang.ac.kr/mailman/listinfo/16ng
Archive: http://eeca16.sogang.ac.kr/pipermail/16ng
REFERENCES:
http://www.ietf.org/internet-drafts/draft-jang-mipshop-fh80216e-00.txt
http://www.watersprings.org/pub/id/draft-jin-ipv6-over-ieee802.16-00.txt
http://www.ietf.org/internet-drafts/draft-jee-mip4-fh80216e-00.txt
IPv6 over IEEE 802.16(e) Networks Problem Statements (coming soon)
Regards,
Gabriel & Daniel
16ng BoF co-chairs
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