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Doc.: IEEE 802.11-04/1019r0 Submission September 2004 Soohong Daniel Park & Jaehwan Lee Access Router Identifier (ARID) for supporting L3 mobility Soohong.

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Presentation on theme: "Doc.: IEEE 802.11-04/1019r0 Submission September 2004 Soohong Daniel Park & Jaehwan Lee Access Router Identifier (ARID) for supporting L3 mobility Soohong."— Presentation transcript:

1 doc.: IEEE 802.11-04/1019r0 Submission September 2004 Soohong Daniel Park & Jaehwan Lee Access Router Identifier (ARID) for supporting L3 mobility Soohong Daniel Park soohong.park@samsung.com Samsung Electronics. Jaehwan Lee tasmea@kt.co.kr Korea Telecom

2 doc.: IEEE 802.11-04/1019r0 Submission September 2004 Soohong Daniel Park & Jaehwan Lee Miscellaneous Handover in WLAN Typically, 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. AP AR MN2 MN1 L3 Handover ?

3 doc.: IEEE 802.11-04/1019r0 Submission September 2004 Soohong Daniel Park & Jaehwan Lee 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.

4 doc.: IEEE 802.11-04/1019r0 Submission September 2004 Soohong Daniel Park & Jaehwan Lee Current drawback of FMIP6 After discovering a new nearby AP, MN sends RtSolPr in order to resolve AP identifiers to subnet router information. 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. Handover doesn’t need a new CoA. Similar drawback happens on IPv4. AR MN1 PrRtAdv (Code=2, LLA Sub-type=5) RtSolPr RtSolPr: Router Solicitation for Proxy Advertisement PrRtAdv: Proxy Router Advertisement AP

5 doc.: IEEE 802.11-04/1019r0 Submission September 2004 Soohong Daniel Park & Jaehwan Lee Proposal AP (means network attachment points) lets MN know the handover either L2 or L3 when moving to a new attachment point. Reduced the redundant message exchanges between MN and AR when doing L2 handover. Supporting effective handover decision to MN for doing a fast handover.

6 doc.: IEEE 802.11-04/1019r0 Submission September 2004 Soohong Daniel Park & Jaehwan Lee Potential Solution -1 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. –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).

7 doc.: IEEE 802.11-04/1019r0 Submission September 2004 Soohong Daniel Park & Jaehwan Lee Potential Solution -1 Frame Control DurationDASABSSID Sequence Control Frame Body FCS Timestamp Beacon Interval Capability Information SSID Supported Rates FH Parameter Set DS Parameter Set CF Parameter Set IBSS Parameter Set TIM Beacon Probe response Timestamp Beacon Interval Capability Information SSID Supported Rates FH Parameter Set DS Parameter Set CF Parameter Set IBSS Parameter Set ARID ESSIBSS CF- Pollable CF-Poll request Privacy Short Preamble (802.11b) PBCC (802.11b) Channel Agility (802.11b) ARID 0715 So far, the length of ARID is not fixed because several amendments are using this area.

8 doc.: IEEE 802.11-04/1019r0 Submission September 2004 Soohong Daniel Park & Jaehwan Lee Potential Solution -2 ARID in conjunction with 802.11k-D1.0 –Section 7.3.2.26 Neighbor Report element (Fig. k18,k19) It contains pertinent information on a collection of AP’s that are candidates to which STAs can roam to. Element ID (1) Length (1) Lower Timestamp Element(4) BSSID (6)BSSID Info. (2) Channel Number (1) Channel Band (1) PHY Options (1) Neighbor TBTT Offset (2) Beacon Interval (2) Octets: Bit: ARID bit, if different from the current ARID, indicates that the AP represented by this ARID is a different subnet, so that L3 handover must be performed when attaching to this AP. Reachability (2)RSN (1)Key Scope (1)Capability (5)Reserved(3)ARID Reserved (12-15)

9 doc.: IEEE 802.11-04/1019r0 Submission September 2004 Soohong Daniel Park & Jaehwan Lee Proposed Operation - I AP AR MN2MN1 AP Scanning Beacon or Probe response with ARID (aaaa) aaaa ? L2 Handoff aaaabbbb Scanning Beacon or Probe response with ARID (bbbb) bbbb ? L3 Handoff IETF is working on this area (CAPWAP WG) aaaa Solution-1: Extended Beacon

10 doc.: IEEE 802.11-04/1019r0 Submission September 2004 Soohong Daniel Park & Jaehwan Lee Proposed Operation - II AP AR MN2MN1 AP Site Report response with ARID (aaaa) aaaa ? L2 Handoff aaaabbbb bbbb ? L3 Handoff aaaa Site Report Request Site Report response with ARID (bbbb) L3 Handover Solution-2: Extended Site Report element of 802.11k

11 doc.: IEEE 802.11-04/1019r0 Submission September 2004 Soohong Daniel Park & Jaehwan Lee Use case – I (hotspot) When MN tries to roam, first MN searches near APs. If near APs have different IP subnet due to different AR, selecting the AP which does not need to L3 roaming is beneficial In this case, MN should roam to AP2, not to AP3, because AP3 does not share the AR even though SSID is the same. Internet AP1 AP3 Router 1 Router 2 (NAS) AP2 xDSL Modem DSLAM MN xDSL Ethernet T1 or E1

12 doc.: IEEE 802.11-04/1019r0 Submission September 2004 Soohong Daniel Park & Jaehwan Lee Use case – II (University) When MN moves to next building, MN should roams to other AP located in next building. In university, generally IP subnet can be different according to building. In this case, MN must renew IP address due to different AR. ARID can reduce handover time if MN associate with AP and renew IP address simultaneously. Internet AP1 Building 1 MN Building 2 AP2 Ethernet

13 doc.: IEEE 802.11-04/1019r0 Submission September 2004 Soohong Daniel Park & Jaehwan Lee 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. Today, ISP is requiring for this solution.

14 doc.: IEEE 802.11-04/1019r0 Submission September 2004 Soohong Daniel Park & Jaehwan Lee Open Issue The length of ARID is not definitely fixed so far in this proposal. –Several amendments are likely to use this area. At least 4-bits are available at this stage.

15 doc.: IEEE 802.11-04/1019r0 Submission September 2004 Soohong Daniel Park & Jaehwan Lee Motion Move to request that the IEEE 802.11 WIEN SG accepts that the Access Router ID (ARID) is regarded as work to be done within the PAR

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