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AP Architecture Thoughts

This article explores the deliberately vague definitions in the 802.11 architecture, such as "Integration Function," "Portal," "DS," and "DSM," and how different companies interpret these terms differently. The author discusses missing blocks and fills in the gaps to provide a clearer understanding of the architecture.

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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. 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

  4. 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

  5. 802.1D Architecture Mike Moreton, STMicroelectronics

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

  12. 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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