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September 2004Rudolf, Carlton1 802.21 and TGr Marian Rudolf, Alan Carlton - InterDigital doc: IEEE 802.11-04/1052r0.

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Presentation on theme: "September 2004Rudolf, Carlton1 802.21 and TGr Marian Rudolf, Alan Carlton - InterDigital doc: IEEE 802.11-04/1052r0."— Presentation transcript:

1 September 2004Rudolf, Carlton1 802.21 and TGr Marian Rudolf, Alan Carlton - InterDigital doc: IEEE 802.11-04/1052r0

2 September 2004 Submission Rudolf, Carlton 2 Summary 802.21 and TGr seem to address complementary mobility scenarios 802.21 – Across 802 networks and 802.11 Inter-ESS mobility 802.11r – Intra-ESS mobility for 802.11 But expect partial overlap between 802.21 and TGr mobility solutions, ESS definition is too broad and unclear and does not allow to draw a clear boundary line between 802.21 and TGr When addressing L2 mobility handling across different 802 technologies, 802.21 will automatically come up with a solution that implies L2 mobility handling for the same 802 technology Two different mobility solutions for 802.11 are not an attractive option, 802.21 and TGr mobility solutions should, either be fully complementary or TGr solution should be forwards-compatible with future 802.21 framework Many good reasons speak in favor of a quickly available TGr standards supplement, but need to anticipate on 802.21 development

3 doc: IEEE 802.11-04/1052r0September 2004 Submission Rudolf, Carlton 3 Introduction From 802.21 and TGr PARs and 802.21 requirements, TGr scope “… This PAR will apply only to the STA-AP state within the same ESS,…” 802.21 scope “… extensible 802 media access independent mechanisms that enable the optimization of handover between heterogeneous 802 systems and may facilitate handover between 802 systems and cellular systems” 802.21 draft requirements – Handover Scenarios IEEE 802 Family, … Handover between 802.3 and 802.11 networks Handover between 802.11 and 802.11 networks, across ESSs … 802.21 Media-Independent Handover addresses 802.xx to 802.yy and 802.11 inter-ESS mobility cases 802.11r Fast BSS Transition addresses 802.11 intra-ESS mobility cases

4 doc: IEEE 802.11-04/1052r0September 2004 Submission Rudolf, Carlton 4 802.11 ESS definition ESS definition in 802.11-1999 Clause 3.25 “A set of one or more interconnected basic service sets (BSSs) and integrated local area networks (LANs) that appears as a single BSS to the logical link control layer at any station associated with one of those BSSs.” ESS definition in 802.11-1999 Clause 5 “5.2.2.1 The key concept is that the ESS network appears the same to an LLC layer as an IBSS network. Stations within an ESS may communicate and mobile stations may move from one BSS to another (within the same ESS) transparently to LLC.” Key points, L2 connectivity inside ESS SSID does not define the ESS STAs within ESS may communicate and move transparently to LLC

5 doc: IEEE 802.11-04/1052r0September 2004 Submission Rudolf, Carlton 5 802.11 ESS – logical definition AP + DS + Portal AP Distribution System STA Portal 802.3 network HOSTRouter 802.11-1999 Clause 5.2.2.1 “The key concept is that the ESS network appears the same to an LLC layer as an IBSS network. Stations within an ESS may communicate and mobile stations may move from one BSS to another (within the same ESS) transparently to LLC.” Source: 11-04-0629-01 by Nortel, Airespace

6 doc: IEEE 802.11-04/1052r0September 2004 Submission Rudolf, Carlton 6 WM Portal Integration Distribution System AP Device WM Portal Integration Distribution System AP Device ESS with a logical DS and Portal using a Router STA 802.3 network HOSTRouter STA 802.3 L2 Hub or Switch Portal L2 link 802.3 L2 Hub or Switch Portal Distribution System ESS 802.11 ESS definition / L2 connectivity with VLAN Source: 11-04-0629-01 by Nortel, Airespace

7 doc: IEEE 802.11-04/1052r0September 2004 Submission Rudolf, Carlton 7 Scenario 1 – L3 versus L2 mobility Internet R1 AP4 R2 AP3 AP2 AP1 L2 link ESS1 L2 link ESS2 TGr L2 mobility 802.21 L3 assisted mobility (Mobile IP) FA No L2 connectivity between two DS Clear separation between L2 and L3 mobility handling 802.21 and 802.11r complementary

8 doc: IEEE 802.11-04/1052r0September 2004 Submission Rudolf, Carlton 8 Scenario 2 – Complex network setups Internet R1 AP4 AP3 AP2 AP1 L2 link ESS TGr L2 mobility 802.21 L3 assisted mobility (Mobile IP) FA R VLAN L2 connectivity with Router Both L3 and L2 mobility handling apply 802.21 (L3 assisted) and 802.11r (L2) conflicting mobility handling procedures ?  Need to ensure some degree of cooperation between 802.21 and TGr mobility solutions FA R2

9 doc: IEEE 802.11-04/1052r0September 2004 Submission Rudolf, Carlton 9 Scenario 3 – In case 802.21 and TGr don’t have the same understanding what an ESS is Internet R1 AP4 AP3 AP2 AP1 TGr L2 mobility FA R VLAN If 802.21 don’t agree on “ESS” definition Both come up with a L2 mobility solution, but addressing the same scenario 802.21 and 802.11r conflicting mobility handling procedures ?  Need to define mobility scenarios to avoid solving the same problem twice ESS 802.21 L2 mobility 802.21 perspective L2 link ESS1 L2 link ESS2 TGr perspective

10 doc: IEEE 802.11-04/1052r0September 2004 Submission Rudolf, Carlton 10 Scenario 4 – 802.21 L2 mobility part Internet R1 802.3 AP2 AP1 802.21 L2 mobility FA R VLAN L2 link ESS TGr L2 mobility 802.21 handover scenario from 802.3 to 802.11 To be seamless, 802.21 will need features such as pre- authentication and neighbor discovery – same functionality needed in TGr for 802.11 ESS From 802.21 perspective, the 802.3 ports could be replaced by 802.11 AP, it would very likely not change the L2 mobility procedure ! Both 802.21 and 802.11r duplicate functionality to allow seamless handover ?

11 doc: IEEE 802.11-04/1052r0September 2004 Submission Rudolf, Carlton 11 Scenario 4 – 802.21 L2 mobility (cont’d) 802.21 802.11r Pre-authentication Network discovery Management information … In L2.5 Pre-authentication Network discovery Management information … In MAC

12 doc: IEEE 802.11-04/1052r0September 2004 Submission Rudolf, Carlton 12 Conclusions Expect partial overlap between 802.21 and TGr mobility solutions, ESS definition is too broad and unclear and does not allow to draw a clear boundary line between 802.21 and TGr without agreeing on specific mobility scenarios When addressing L2 mobility handling across different 802 technologies, 802.21 will automatically come up with a solution that implies L2 mobility handling for the same 802 technology Two different mobility solutions for 802.11 are not an attractive option, 802.21 and TGr mobility solutions should, either be fully complementary or TGr solution should be forwards-compatible with future 802.21 framework

13 doc: IEEE 802.11-04/1052r0September 2004 Submission Rudolf, Carlton 13 Conclusions (cont) We favor quickly available solutions that address 802.11 mobility but recognize that evolution towards 802 inter- technology solutions (802.21) is of great importance

14 doc: IEEE 802.11-04/1052r0September 2004 Submission Rudolf, Carlton 14 Recommendations Harmonization Valuable worked conducted within the group shall provide solid ground for further development within 802.21 (Forward Compatibility) Joined meeting slot with 802.21 is required as soon as 11r starts proposal evaluation Existing ESS logical concept needs to be translated into tangible implementation scenarios Either define mobility scenarios or Bring the issue up to 802.1

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