Transcript 21-04-0078-00-0000

• IEEE 802.21 MEDIA INDEPENDENT HANDOVER
• DCN: 21-04-0078-00-0000.
• Title: Access Router Identifier (ARID) for supporting L3
mobility
• Date Submitted: July, 14, 2004
• Presented at IEEE 802.21 session 3 in Portland, Oregon
• Authors or Source(s):
•
Soohong Daniel Park
• Abstract: This is the abstract text. Replace this text with a short
statement of the contents and purpose of the presentation.
Communicate well, you only have a few lines or so to convey
the essence of the slides.
21-04-0078-00-0000
Soohong Daniel Park, Samsung Electronics.
IEEE 802.21 presentation release statements
• This
document has been prepared to assist the IEEE 802.21 Working Group. It
is offered as a basis for discussion and is not binding on the contributing
•
•
individual(s) or organization(s). The material in this document is subject to
change in form and content after further study. The contributor(s) reserve(s)
the right to add, amend or withdraw material contained herein.
The contributor grants a free, irrevocable license to the IEEE to incorporate
material contained in this contribution, and any modifications thereof, in the
creation of an IEEE Standards publication; to copyright in the IEEE’s name
any IEEE Standards publication even though it may include portions of this
contribution; and at the IEEE’s sole discretion to permit others to reproduce in
whole or in part the resulting IEEE Standards publication. The contributor also
acknowledges and accepts that this contribution may be made public by IEEE
802.21.
The contributor is familiar with IEEE patent policy, as outlined in Section 6.3
of
the
IEEE-SA
Standards
Board
Operations
Manual
<http://standards.ieee.org/guides/opman/sect6.html#6.3>
and
in
Understanding Patent Issues During IEEE Standards Development
http://standards.ieee.org/board/pat/guide.html>
21-04-0078-00-0000
Soohong Daniel Park, Samsung Electronics.
Access Router Identifier (ARID)
for supporting L3 mobility
Soohong Daniel Park
[email protected]
Samsung Electronics.
21-04-0078-00-0000
Soohong Daniel Park, Samsung Electronics.
Miscellaneous Handover in WLAN
• STA doesn’t know whether it changes AP(MN1)
or AR(MN2) when moving to another domain
without IP layer operations or even more layers.
AR
AP
AR
AP
MN1
L3 Handover ?
21-04-0078-00-0000
AP
MN2
L3 Handover ?
Soohong Daniel Park, Samsung Electronics.
Problem Statement
• #3 There is no standardized mechanism in 802 for
information exchange between mobile terminals and
network attachment points. This impacts the ability to
make informed decisions to select between disparate
network attachment points or to initiate handoffs between
heterogeneous network types or between administrative
domains within a single network type. Thus there is a need
to develop a standard that permits mobile terminals and
network attachment points to access information on which
to base effective handoff decisions.
21-04-0078-00-0000
Soohong Daniel Park, Samsung Electronics.
Current drawback of FMIP6
•
After discovering a new nearby AP, MN
sends RtSolPr in order to resolve AP
identifiers to subnet router information.
AR
PrRtAdv (Code=2, LLA
Sub-type=5)
RtSolPr
•
•
If the new AP is connected to the PAR’s
current interface itself, PAR MUST
respond indicating that the point of
attachment is known, but is connected to
current interface.
AP
AP
MN1
Handover does not require change of
CoA.
RtSolPr: Router Solicitation for Proxy Advertisement
PrRtAdv: Proxy Router Advertisement
•
Similar drawback happens on IPv4.
21-04-0078-00-0000
Soohong Daniel Park, Samsung Electronics.
Proposal
• AP (network attachment points) lets MN know the
handover character (L2 or L3) when moving to a
new attachment point.
• Reduced the redundant message exchanges
between MN and AR when performing L2
handover.
• Supporting effective handover decision to MN for
doing a fast handover.
21-04-0078-00-0000
Soohong Daniel Park, Samsung Electronics.
Potential Solution
• ARID in the MAC Management Frame.
– Capability Information in the Beacon (and Probe response) can be
used for letting MN know its movement whether it occurs on L2
or L3. (Reserved field)
– Simply extended value for distinguishing either L2 handover or
L3.
– Just let STA knows what handover tends to occur when moving to
another link.
– Simply managed and configured by admin.
• ARID (Access Router Identifier) can be simply configured in conjunction with
the SSID on the AP (network attachment points).
21-04-0078-00-0000
Soohong Daniel Park, Samsung Electronics.
ARID Format
Frame
Control
Beacon
Probe response
Duration
DA
SA
Timestamp
Beacon
Interval
Capability
Information
Timestamp
Beacon
Interval
Capability
Information
Sequence
Control
BSSID
Frame
Body
FCS
SSID
Supported
Rates
FH
Parameter
Set
DS
Parameter
Set
CF
Parameter
Set
IBSS
Parameter
Set
SSID
Supported
Rates
FH
Parameter
Set
DS
Parameter
Set
CF
Parameter
Set
IBSS
Parameter
Set
0
7
ARID
ESS
21-04-0078-00-0000
IBSS
CFPollable
CF-Poll
request
Privacy
Short
Preamble
(802.11b)
PBCC
(802.11b)
Channel
Agility
(802.11b)
TIM
15
ARID
Soohong Daniel Park, Samsung Electronics.
Proposed Operation - I
IETF is working on this area
(CAPWAP WG)
AP
AR
aaaa
AP
MN1
aaaa ?
L2 Handoff
21-04-0078-00-0000
AR
aaaa
Scanning
Beacon or Probe response
with ARID (aaaa)
MN2
AP
bbbb
Scanning
Beacon or Probe response
with ARID (bbbb)
bbbb ?
L3 Handoff
Soohong Daniel Park, Samsung Electronics.
Proposed Operation - II
AR
AR
AR
AP
AR
AP
aaaa
aaaa
MN1
21-04-0078-00-0000
AP
MN1
aaaa ?
L2 Handoff
AR
aaaa
Scanning
Beacon or Probe response
with ARID (aaaa)
MN2
AP
bbbb
Scanning
Beacon or Probe response
with ARID (bbbb)
bbbb ?
L3 Handoff
Soohong Daniel Park, Samsung Electronics.
Pros and Cons
• Pros
– Removing unnecessary
packet exchanges
between MN and AR
when L2 handover.
– Reducing handover
latency.
– Well managed method
against SSID.
21-04-0078-00-0000
• Cons
– Putting ARID in the
beacon.
– Limited length (8-bits
of reserved field).
– Requiring admin
configurations.
Soohong Daniel Park, Samsung Electronics.
Conclusion
• Develop a standard that permits mobile terminals
and network attachment points to access
information on which to base effective handover
decisions.
• Suggest to work on the solution for distinguishing
either L2 or L3 handover on the 802.11 as well as
heterogeneous networks.
21-04-0078-00-0000
Soohong Daniel Park, Samsung Electronics.
Suggestion
• ARID is defined a general terms for 802.21.
• Related groups (e.g., 802.11 TGr/WIEN,
802.16…) could define it in specific terms for
each solutions.
21-04-0078-00-0000
Soohong Daniel Park, Samsung Electronics.