1. doc.: IEEE 802.11-04/0981r0 TGs Reference Architecture Considerations August 30, 2004 Tricci So.Slide 1 TGs ESS Mesh System Reference Architecture Considerations TGs ESS Mesh System Reference Architecture Considerations Prepared by Tricci So Nortel Networks

2. doc.: IEEE 802.11-04/0981r0 TGs Reference Architecture Considerations August 30, 2004 Tricci So.Slide 2 MotivationsMotivations Considering the TGs System Architecture Framework......Considering the TGs System Architecture Framework...... Where should we start???

3. doc.: IEEE 802.11-04/0981r0 TGs Reference Architecture Considerations August 30, 2004 Tricci So.Slide 3 What Have TGs Five Criteria Said?  6.2 Compatibility  IEEE 802 defines a family of standards. All standards shall be in conformance with the IEEE 802.1 Architecture, Management and Interworking documents as follows: 802. Overview and Architecture, 802.1D, 802.1Q and parts of 802.1f. If any variances in conformance emerge, they shall be thoroughly disclosed and reviewed with 802. Each standard in the IEEE 802 family of standards shall include a definition of managed objects, which are compatible with systems management standards.  ESS Mesh specifies one possible Wireless Distribution System (WDS) that behaves in every respect as an IEEE 802.11 Infrastructure Mode network. As such, it is entirely compatible with the IEEE 802.11 architecture and, by inference, compatible with the IEEE 802 architecture, including IEEE 802.1D, IEEE 802.1Q, and IEEE 802.1F.  6.2 Compatibility  IEEE 802 defines a family of standards. All standards shall be in conformance with the IEEE 802.1 Architecture, Management and Interworking documents as follows: 802. Overview and Architecture, 802.1D, 802.1Q and parts of 802.1f. If any variances in conformance emerge, they shall be thoroughly disclosed and reviewed with 802. Each standard in the IEEE 802 family of standards shall include a definition of managed objects, which are compatible with systems management standards.  ESS Mesh specifies one possible Wireless Distribution System (WDS) that behaves in every respect as an IEEE 802.11 Infrastructure Mode network. As such, it is entirely compatible with the IEEE 802.11 architecture and, by inference, compatible with the IEEE 802 architecture, including IEEE 802.1D, IEEE 802.1Q, and IEEE 802.1F.

4. doc.: IEEE 802.11-04/0981r0 TGs Reference Architecture Considerations August 30, 2004 Tricci So.Slide 4 Why Should We Start With 802.1D? MAC LLC MACMAC RELAY MAC LLC MAC Service User Provider MAC Bridge Reference Std 802.1D-2004, section 6. MAC Bridges interconnect the separate IEEE 802 LANs that compose a Bridged Local Area Network by relaying and filtering frames between the separate MACs of the bridged LANs.... Std 802.1D-2004, section 6. MAC Bridges interconnect the separate IEEE 802 LANs that compose a Bridged Local Area Network by relaying and filtering frames between the separate MACs of the bridged LANs.... 802.11sMesh Reference obtained from Std. 802.1D Figure 6-1. Reference obtained from Std. 802.1D Figure 6-1. WirelessDistributedSystem 802.11LANs

5. doc.: IEEE 802.11-04/0981r0 TGs Reference Architecture Considerations August 30, 2004 Tricci So.Slide 5 What Does IEEE 802 Say About 802.1D Support Requirements from 802.11? IEEE Std. 802.1D-2004, 6.5 Support of the Internal Sublayer Service by specific MAC procedures... 6.5.4 Support by IEEE Std 802.11 (Wireless LANs) A Bridge to an IEEE 802.11 LAN shall connect to an IEEE 802.11 Portal, which in turn connects to an IEEE 802.11 Distribution System. For the purpose of bridging, the service interface presented at the Portal is identical to the service interface presented from IEEE 802 LAN components.... On receipt of an M_UNITDATA.request primitive, the portal constructs a MAC Service Data Unit and passes it to the MAC Data service for transmission using the parameters supplied... On receipt of a valid MAC Service Data Unit, the portal generates an M_UNITDATA.indication primitive with parameter values derived from the frame fields....

6. doc.: IEEE 802.11-04/0981r0 TGs Reference Architecture Considerations August 30, 2004 Tricci So.Slide 6 What Is 802.1D Internal Sublayer Service? IEEE Std. 802.1D-2004, 6.4 Internal Sublayer Service provided within the MAC Bridge... The Internal Sublayer Service (ISS) provided by a MAC entity to the MAC Relay Entity within a Bridge is that provided by the individual MAC for the LAN Port. This observes the appropriate MAC procedures and protocol for the LAN to which it attaches. No control frames, i.e., frames that do not convey MAC user data, are forwarded on any LAN other than that on which they originated. The Internal Sublayer Service is derived from the MAC Service defined by ISO/IEC 15802-1 by augmenting that specification with elements necessary to the performance of the relay function..... Two parameters are added to the list of parameters associated with the MA_UNITDATA.request and MA-UNITDATA.indication primitives defined by ISO/IEC 15802-1. These are frame_type and frame_check_sequence. The definition of the Internal Sublayer Service does NOT add any new service primitives to those defined by the LAN MAC Service Definition.

7. doc.: IEEE 802.11-04/0981r0 TGs Reference Architecture Considerations August 30, 2004 Tricci So.Slide 7 What Does 802.1D Look Like in term of 802.3 and 802.11 Protocol Stack? LLC MAC Service ISS MAC Relay Entity 802.1D Clause 6.5.1 802.1D Clause 6.5.4 802.3802.11 802.3 LAN 802.11 LAN The MAC Sublayer in an 802.1D MAC Bridge IEEE Std 802.1D, 6.5.4. On receipt of an M_UNITDATA.request primitive, the portal constructs a MAC Service Data Unit and passes it to the MAC Data service for transmission using the parameters supplied... On receipt of a valid MAC Service Data Unit, the portal generates an M_UNITDATA.indication primitive with parameter values derived from the frame fields.... IEEE Std 802.1D, 6.5.4. On receipt of an M_UNITDATA.request primitive, the portal constructs a MAC Service Data Unit and passes it to the MAC Data service for transmission using the parameters supplied... On receipt of a valid MAC Service Data Unit, the portal generates an M_UNITDATA.indication primitive with parameter values derived from the frame fields.... MAC Independent Functions MAC Dependent Functions MAC Specific Functions 802.11 Portal is part of the ISS Refer to IEEE Std 802.1D Figure 7-3 Bridge Architecture MAC Service Part of the Distribution System (DS)

8. doc.: IEEE 802.11-04/0981r0 TGs Reference Architecture Considerations August 30, 2004 Tricci So.Slide 8 ISS Service Mappings for 802.11 MAC M_UNITDATA.request(frame_type, mac_action, DA, SA, Routing Information, MSDU, user_priority, access_priority, FCS) M_UNITDATA.indication(frame_type, mac_action, DA, SA, Routing Information, MSDU, user_priority, access_priority, FCS) DA SA MSDU FCS 802.11 Frame Fields user_data_frame Request_with_no_response Fixed Mapping Fixed Mapping Refer to IEEE Std 802.1D-2004: 6.5.4 Support by IEEE Std 802.11 (Wireless LAN) To Be Determined

9. doc.: IEEE 802.11-04/0981r0 TGs Reference Architecture Considerations August 30, 2004 Tricci So.Slide 9 802.11 LAN 802.11s ESS Mesh Reference 802.11 ESS Mesh 802.11 ESS Mesh Access I/F MeshI/F Mesh AP M2 M1 M2 M3 MAC LLC MESHRELAY MACMACMACMACMACMAC Access I/F MeshI/F Mesh AP M3 MeshI/F Mesh Point M1 MAC LLC 802.11 LAN 802.11 ESS Mesh 802.11 ESS Mesh Network 802.11 ESS Mesh Reference MESHRELAYMESHRELAY