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AP Architecture Thoughts

AP Architecture Thoughts. Mike Moreton, STMicroelectronics. Introduction. 802.11 defines terms such as “Integration Function”, “Portal”, “DS”, “DSM” etc. Definition is deliberately vague To allow different implementations

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AP Architecture Thoughts

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  1. AP Architecture Thoughts Mike Moreton, STMicroelectronics Mike Moreton, STMicroelectronics

  2. Introduction • 802.11 defines terms such as “Integration Function”, “Portal”, “DS”, “DSM” etc. • Definition is deliberately vague • To allow different implementations • Hence different companies have different views of what these terms actually mean • Almost any diagram is likely to be unacceptable to a majority of companies Mike Moreton, STMicroelectronics

  3. Definitions 3.20 distribution system (DS): A system used to interconnect a set of BSSs and integrated LANs to create an ESS. 3.21 distribution system medium (DSM): The medium or set of media used by a DS for communications between APs and portals of an ESS. 3.25 extended service set (ESS): A set of one or more interconnected BSSs and integrated LANs that appears as a single BSS to the LLC layer at any station associated with one of those BSSs. 3.29 integration: The service that enables delivery of MSDUs between the DS and an existing, non-IEEE 802.11 LAN (via a portal). 3.39 portal: The logical point at which MSDUs from a non-IEEE 802.11 LAN enter the DS of an ESS. Mike Moreton, STMicroelectronics

  4. Position of Portal Mike Moreton, STMicroelectronics

  5. DS and Integrated LAN (1999) DS DSM Portal (Integration Function) 802.11 MAC (AP STA) 802.11 MAC (AP STA) Integrated LAN AP AP Non 802.11 Endpoint STA STA BSS BSS ESS Mike Moreton, STMicroelectronics

  6. DS and Integrated LAN (1999) – missing blocks filled in DS 802.11 MAC Relay Entity 802.11 MAC Relay Entity DSM MAC DSM MAC AP AP DSM 802.11 MAC (AP STA) 802.11 MAC (AP STA) Portal Integrated LAN STA Non 802.11 Endpoint STA BSS BSS ESS Mike Moreton, STMicroelectronics

  7. 802.1D Architecture Mike Moreton, STMicroelectronics

  8. 1999 including LLC Higher Layer Entities Higher Layer Entities 802.11 MAC Relay Entity 802.11 MAC Relay Entity LLC LLC LLC LLC DSM MAC DSM MAC AP AP DSM 802.11 MAC (AP STA) 802.11 MAC (AP STA) Portal DS Integrated LAN Non 802.11 Endpoint STA STA BSS BSS ESS Mike Moreton, STMicroelectronics

  9. 1999 with 802.X DS Higher Layer Entities Higher Layer Entities 802.11 MAC Relay Entity 802.11 MAC Relay Entity LLC LLC LLC LLC Frame Routing 802.X MAC 802.X MAC Frame Routing AP AP 802.X LAN 802.11 MAC (AP STA) 802.11 MAC (AP STA) Virtual Portal DS Virtual Integrated LAN 802.X Endpoint STA STA BSS BSS ESS Mike Moreton, STMicroelectronics

  10. 1999 – portal in AP Higher Layer Entities Higher Layer Entities 802.11 MAC Relay Entity 802.11 MAC Relay Entity LLC LLC LLC LLC Portal Portal Frame Routing Frame Routing DS DS Frame Routing Frame Routing 802.11 MAC (AP STA) 802.11 MAC (AP STA) ILAN MAC ILAN MAC AP AP Integrated LAN (ILAN) STA Non 802.11 Endpoint STA BSS BSS ESS Mike Moreton, STMicroelectronics

  11. 11i DS 802.11 MAC Relay Entity Frame Routing Frame Routing Frame Routing Port for STA 1 Port for STA 2 Port for STA 3 Mike Moreton, STMicroelectronics

  12. 11i with broadcast DS 802.11 MAC Relay Entity Frame Routing Frame Routing Frame Routing Frame Routing Port for STA 1 Port for STA 2 Port for STA 3 Broadcast Port Mike Moreton, STMicroelectronics

  13. 11i with broadcast, single MAC DS 802.11 MAC Relay Entity Frame Routing Frame Routing Frame Routing Frame Routing Port for STA 1 Port for STA 2 Port for STA 3 Broadcast Port 802.11 MAC Mike Moreton, STMicroelectronics

  14. 11i with broadcast, single MAC, plus WDS DS 802.11 MAC Relay Entity Frame Routing Frame Routing Frame Routing Frame Routing Frame Routing Frame Routing Frame Routing WDS Port 1 WDS Port 2 WDS Port 3 Port for STA 1 Port for STA 2 Port for STA 3 Broadcast Port 802.11 MAC Mike Moreton, STMicroelectronics

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