Transcript 21-06-0570-01-0000-Higher-layer-IEs

• IEEE 802.21 MEDIA INDEPENDENT HANDOVER
• DCN: 21-06-0570-01-0000
• Title: Higher layer services and information IEs
• Date Submitted: March 2006
• Authors or Source(s): Qiaobing Xie for Higher Layer Services
and information IE ad-hoc Team
• Abstract: This document describes the background and meeting
summary of 802.21 Higher Layer Services and information IE
ad-hoc session (held on 2/14/06), and provides a base for
continued discussion on this topic.
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Higher layer services and information IEs
• What we already have:
 IP subnets (per PoA)
 PoA capabilities bitmap (per PoA)







Security Available (y/n)
QoS Available (y/n)
Internet Access Available (y/n)
IP Version 4 supported (y/n)
IP Version 6 supported (y/n)
Emergency Services available (y/n)
Others
• Newly proposed (and summary of 2/14/06 discussion):
 IP address configuration method supported (per PoA?)


DHCP address (per PoA or per AN?)




Discussed. Need more clarification about the definition and use cases. No conclusion
reached.
Discussed. No conclusion reached about the necessity and usefulness of this IE. No
conclusion about how to relate it to the current DHCP protocol.
AAA address (per PoA or per AN?) not discussed.
Others? Not discussed.
Chair agreed to continue the discussion at another ad-hoc at March f2f
meeting
Common motivation for these new IEs?
• If a handover between two access networks requires tearing down the
current IP connectivity and re-establish a new one to the target network, this
may cause significant delay due to the slow IP parameter negotiation
procedures required by some IETF protocols.
• Can we utilize MIH IS to get some IP configuration information before a
handover, so that the upper layer could predicatively plan for or establish the
IP connectivity (or part of it) to a potential target network?
 Do
we have a consensus that this is a valuable capability to have?
 Is
there other mechanism that exists and is better suited for this than
MIIS?
 Are
the proposed IEs the right ones for this purpose?
 What
is the best way to define the IEs?
How to incorporate the new IEs (Option 1)
Option 1: Add them in parallel to the existing IEs in Table 6 under per PoA
higher layer services/info. For example:
Name of
Information
Element
Description
4.3
TYPE_IE_POA_IP
_CONFIG_METH
ODS
IP address configuration
method supported
bitmap
4.4
TYPE_IE_POA_
DHCP_ADDR
DHCP address
IP address
4.5
TYPE_IE_POA_
AAA_ADDR
AAA address
IP address
No
Representation
Length
(octets)
How to incorporate the new IEs (Option 2a)
Option 2a: Add them to the existing POA capabilities IE in Table 6 (of cause we no
longer can use the bitmap representation):
No
4.2
Name of
Information
Element
TYPE_IE_POA_
CAPABILITIES
Description
A list of PoA
capabilities
Length
(octets)
Representation
Security Available
QoS Available
Internet Access Available
IP Version 4 supported
IP Version 6 supported
Emergency Services
IP Address config methods
DHCP address
AAA address
(Others)
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
bitmap
IP addr
IP addr
variable
How to incorporate the new IEs (Option 2b)
Option 2b: Should there be an Access Network specific capabilities IE in Table 6?
No
2.7
Name of
Information
Element
TYPE_IE_AN_
HIGH_LAYER_
CAPABILITIES
4.2
TYPE_IE_POA_
CAPABILITIES
Description
Length
(octets)
Representation
A list of AN
higher layer
capabilities
IP Address config methods bitmap
DHCP address
IP addr
AAA address
IP addr
Bitmap of PoA
capabilities
Security Available
QoS Available
Internet Access Available
IP Version 4 supported
IP Version 6 supported
Emergency Services
(Others)
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
variable