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MobileMAN Hardware development for the MAC module current state and outlook IAB meeting By

MobileMAN Hardware development for the MAC module current state and outlook IAB meeting By Ralph Bernasconi, Ivan Defilippis, Silvia Giordano, Alessandro Puiatti SUPSI Manno Helsinki, June 7-8 2004. Contents Introduction Completed work Current work Next steps

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MobileMAN Hardware development for the MAC module current state and outlook IAB meeting By

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  1. MobileMANHardware development for the MAC module current state and outlookIAB meeting By Ralph Bernasconi, Ivan Defilippis, Silvia Giordano, Alessandro Puiatti SUPSI Manno Helsinki, June 7-8 2004 MobileMAN meeting, Helsinki

  2. Contents • Introduction • Completed work • Current work • Next steps • Data structure description • Questions? MobileMAN meeting, Helsinki

  3. IntroductionProject’s SUPSI-DIE goals (reminder) • Provide flexible development- and test-bed for enhanced WLAN protocol (CNR) • Bursty responsive MAC • Better contention scheme (backoff); avoid collisions even for dense and active networks • Ensure compatibility with 802.11x • Provide few samples to partners • Provide inputs for new standard MobileMAN meeting, Helsinki

  4. Completed work (1/8) • Analysis of the Market for the 802.11 implementations • Available solutions? • Which solution best suits our needs? Criteria are: • Cost • Reliability • Flexibility • Access to the software code • Access to the firmware • Easy development environment • Secure and prompt technical support MobileMAN meeting, Helsinki

  5. Completed work (2/8) • Alternatives for development: • Start from scratch: • Implementation of a complete chain: MAC - BB - RF • Start “in the middle”: • Implementation of the MAC only • Start from an already implemented solution: • Change software and firmware for our purpose MobileMAN meeting, Helsinki

  6. Completed work (3/8) • Selected solution • Start “in the middle” • BB and RF already developed by Elektrobit AG: • DT20 Modem (Intersil Prism-I chipset) • Implement MAC on a DSP microcontroller • TI C6713 board (Texas Instruments) MobileMAN meeting, Helsinki

  7. DT20 - Modems Level-Switch interfaces JTAG interface TI C6713 boards Completed work (4/8) • Development system MobileMAN meeting, Helsinki

  8. Completed work (5/8) MobileMAN meeting, Helsinki

  9. Completed work (6/8) • Deep analysis of the 802.11 standard • Procedures and flowchart for the Tx/Rx further implementation • Implementation on the DSP board • CRC on FPGA • Tx/Rx between MAC and BB • Channel Sensing mechanism on MAC (MAC – RF) • MAC Tx mechanism • MAC Rx mechanism MobileMAN meeting, Helsinki

  10. Completed work (7/8) • Implementations on the DSP board (cont.) • Standard backoff mechanism • Regular 802.11 frame generation • Fragmented frame generation • RTS/CTS/DATA/AK handshake • MAC Address recognition • Channel contention MobileMAN meeting, Helsinki

  11. Completed work (8/8) • Tests done (2 systems/boards) • Stress tests in Tx between boards connected by cable • Stress tests in Rx between boards connected by cable • Stress tests in Tx/Rx between boards connected by cable • Stress tests in Tx/Rx between boards in wireless mode • Standard backoff tested successfully • Fragmented Tx/Rx tested successfully • RTS/CTS/DATA/AK handshake tested successfully MobileMAN meeting, Helsinki

  12. Current work • Assembly of the 3rd system/board • Definition of the host interface mechanism(via IEEE-1394/FireWire) • Definition of the standard packets data-structure • Definition of data-structure extensions for cross-layering implementation MobileMAN meeting, Helsinki

  13. Next steps • Implementation on the DSP • NAV (Network Allocation Vector) • Test of a 3 nodes network (with above functionality) • Implementation and test of the host interface mechanism • Implementation and test of the standard packets data-structure • Implementation and test of data-structure extensions for cross-layering • Implementation and test of the modified (CNR-Pisa) backoff mechanism MobileMAN meeting, Helsinki

  14. Data Structure description (1/4) • Memory slotted in parameterized slot length (default frame max length) • Descriptor mechanism for handling data • Different queues for managing data transfer: • From MAC to PHY and from PHY to MAC • From MAC to Host and from Host to MAC • Implementation of priority mechanisms for each queue • Control flags in descriptor in which: • DATA = Frame • DATA = parameters for/from cross-layering MobileMAN meeting, Helsinki

  15. Host to MAC Queue Begin End MPQ Descriptor x Host to MAC Queue Begin Descriptor x+1 Descriptor x+n+1 End HMQ End HMQ MAC h. y+n Frame body y+n End MPQ FCS y+n Data Structure description (2/4) Memory Data Area Descriptor y+n+1 MAC header x MAC h. y+n+1 Frame body x Frame body y+n+1 FCS x FCS y+n+1 Frame body x+1 Descriptor x+n MAC to PHY Queue MAC (DSP) Frame body x+n Frame body x+n+1 Descriptor y+n-1 Descriptor y+n MAC h. y+n-1 Frame body y+n-1 FCS y+n-1 Frame MobileMAN meeting, Helsinki

  16. MAC to Host Queue Begin Descriptor x Descriptor x+1 PHY to MAC Queue PHY to MAC Queue End MHQ End MHQ MAC h. y+2 Frame body y+2 End PMQ FCS y+2 Data Structure description (3/4) Memory Data Area Frame body x Frame body x+1 Descriptor x+n MAC (DSP) Begin Frame body x+n Descriptor x+n+1 Descriptor y MAC header y Begin Frame body x+n+1 Frame body y Descriptor y+1 FCS y MAC h. y+1 Descriptor y+2 Frame body y+1 FCS y+1 Frame MobileMAN meeting, Helsinki

  17. Descriptor k Pn Descriptor 2 P0 Descriptor h Pn-1 Descriptor 2 Pn-1 Descriptor 4 Pn Descriptor 3 P0 Descriptor 2 Pn Descriptor 1 Pn Descriptor g P0 Descriptor 3 Pn End Q-Pn Descriptor 1 Pn-1 End Q-Pn-1 Descriptor P0 End Q End Q-P0 Data Structure description (4/4) Management of queues with different levels of priority MobileMAN meeting, Helsinki

  18. Questions? • Thanks for your attention! MobileMAN meeting, Helsinki

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