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Enhanced Handoff Optimization for IEEE 802.16m Systems

This study explores Enhanced Handoff Optimization strategies for IEEE 802.16m systems to address issues with HHO interruption times and propose a solution to meet the stringent HO interruption time requirements. The research delves into the challenges of conventional HHO methods and potential improvements with Optimized and Expedited HHO approaches.

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Enhanced Handoff Optimization for IEEE 802.16m Systems

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  1. IEEE C802.16m-08/016r2

  2. Long HO Interruption Time in Conventional HHO • Difficulty for meeting HO interruption time below 30 msec

  3. Attempt of Optimized HHO (1/4)

  4. Attempt of Optimized HHO (2/4)

  5. Attempt of Optimized HHO (3/4) MS initiated HO process block diagram as seen by MS (in 802.16e)

  6. Attempt of Optimized HHO (4/4) BS initiated HO process block diagram as seen by MS (in 802.16e)

  7. Problem with Optimized HHO (1/4) • Without parameter adjustment, especially timing adjustment, RNG-REQ might arrive outside of the guard interval, fails to be detected by the target BS.

  8. Problem with Optimized HHO (2/4) • Initial ranging shall use an initial ranging code in an initial ranging slot • TDD: power and frequency could be adjusted autonomously after downlink synchronization • Timing may not be adjusted without handshaking

  9. Problem with Optimized HHO (3/4) • Optimized HHO may incur even longer interruption time than conventional HHO does

  10. Problem with Optimized HHO (4/4)

  11. Proposed Expedited HHO (1/5)

  12. Proposed Expedited HHO (2/5) Table 2- OFDMA Fast_First_Ranging_IE() format

  13. Proposed Expedited HHO (3/5) MS initiated HO process block diagram as seen by MS (in 802.16m)

  14. Proposed Expedited HHO (4/5) BS initiated HO process block diagram as seen by MS (in 802.16m)

  15. Proposed Expedited HHO (5/5) Table 3 (modified Table 290a) Extended UIUC Code Assignment for UIUC = 15

  16. Conclusions • Enhanced Handoff procedures and Messaging should be taken into 802.16m systems as a new discussion feature, because • Conventional HHO cannot meet 802.16m requirement • Optimized HHO may not function • We propose to add a new section and/or description for the enhanced handoff operation in SDD • The proposed Expedited HHO in this proposal could be one of solutions for meeting 802.16m requirements

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