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1394 Requirements for 802.11e

Explore the architecture, topology, and general requirements of Wireless 1394 over 802.11e for seamless connectivity. Learn about hooks needed in 802.11e, enabling mobile applications and easing installation. Summary includes the importance of clock sync, isochronous traffic, and multicast capabilities.

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1394 Requirements for 802.11e

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  1. 1394 Requirements for 802.11e Takashi Sato Philips Research USA Briarcliff Manor, New York t.sato@philips.com

  2. Outline • Our view of Wireless 1394 • Wireless 1394 architecture • Supported net topology • General requirements • Hooks needed in 802.11e • Summary & Conclusion

  3. Home Office Bed Room PDA PC STB TV Printer Scanner HDD Notebook PC Living Room NIM Wireless 1394 Bridge Cable Phone Line DV Printer CD-R SP SP SP D-VHS MD DTV DVCR SP Security Camera CD Changer Wireless 1394 node DVD Amp Navi. System DV Camcorder MIDI Keyboard Remote Wireless 1394 • Connect 1394 clusters wirelessly • Connect wireless 1394 devices to the network • Enable mobile1394 applications and ease of installation

  4. 1394 Node 1394 Bridge 1394 App. Bridge Management & Internal Fabric 1394 Tr. Bridge Tr. Bridge Tr. asynch. Isoch. asynch. Isoch. Isoch. asynch. 1394 Link Bridge Link Bridge Link 1394 Phy Bridge Phy Bridge Phy 1394 Node/Bridge Architecture

  5. Wireless1394 Architecture Wireless1394 Node Wireless 1394 Bridge 1394 App. Bridge Management & Internal Fabric 1394 Tr. Bridge Tr. Bridge Tr. asynch. Isoch. asynch. Isoch. Isoch. asynch. 1394 PAL 1394 PAL Bridge Link 802.11e 802.11e Bridge Phy 802.11a 802.11a

  6. Net Topology 1394 Bus 1394 node 1394 node 1394 node 1394 Bus 1394 node Wireless 1394 bridge Wireless 1394 bridge 802.11 WLAN (virtual 1394 bus) Wireless 1394 bridge Wireless 1394 node Wireless 1394 node 802.11 WLAN (virtual 1394 bus) Wireless 1394 node Wireless 1394 bridge 1394 node 1394 Bus 1394 Bus Wireless 1394 node Wireless 1394 node 1394 bridge 1394 bridge 1394 Bus 1394 node 1394 node 1394 node 1394 node

  7. Wireless 1394 Architecture • Adopted by ETSI/BRAN for Wireless 1394 over Hiperlan/2 in Europe • Adopted by MMAC for Wireless 1394 in Japan • Adopted by 1394 TA/WWG for Wireless 1394 in US, including Wireless 1394 over 802.11 • There have been efforts for harmonization

  8. General Requirements • Support for multiple priority traffic • Clock synchronization • Isochronous traffic • Asynchronous traffic • Support for (virtual) bus management • Topology change management • Bandwidth management • Distributed control

  9. Hooks Needed in 802.11e • Frequent and stable clock/frame synchronization capability • enables 1394 clock synchronization in 1394 PAL (1394 clock: 24.576 MHz ± 100 ppm) • e.g., HL2 uses 2ms frame synch and frame number • 802.11 beacon might be used for this purpose • Isochronous capability • provides guaranteed bandwidth and bounded latency • Multicast capability • enables multiple listeners for an isoch/asynch stream • join/leave capability without disturbing ongoing streams

  10. Hooks Needed in 802.11e • Broadcast capability • enables asynchronous packet broadcast • Retry limit capability • number of retries (or lifetime) can be set by higher layer (at least isoch and asynch packets need separate parameters) • retry failure (timeout) to be reported to higher layer • (Virtual) bus management support • notification of (virtual) bus topology change • Isochronous resource management support • notification of available bandwidth • provision for bandwidth degradation after stream setup

  11. Summary & Conclusion • We are coming from CE camp • We cannot adopt IP-centric solutions just yet • There is very few IP-enabled CE devices • IP is immature for AV applications • 1394 (directly) over 802.11 makes more sense than 1394 over IP over 802.11 • AV applications care about overhead more than IP applications do • IP can coexist over 802.11 or be carried over 1394 over 802.11 if needed

  12. Summary & Conclusion • We need hooks in 802.11e to support our Wireless 1394 over 802.11 solution • Things that can be dealt with in 1394 CL will be dealt in 1394 CL • But, some other things (i.e., hooks) have to be in 802.11e • More interaction is encouraged between 802.11 TGe and 1394 TA/WWG • Please give 1394 TA/WWG a chance to review the 802.11e draft thoroughly, identify required hooks, and make proposals

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