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Proposal for Radio Resource Allocation using Dummy Burst Definition in IEEE 802.16 Uplinks

Proposal for Radio Resource Allocation using Dummy Burst Definition in IEEE 802.16 Uplinks. Takeo Ohseki and Takashi Inoue Radio Access Laboratory, KDDI R&D Laboratories, Inc. Ohara 2-1-15, Fujimino, Saitama, 356-8502, JAPAN. WCNC 2008. Outline. Introduction IEEE 802.16 Systems

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Proposal for Radio Resource Allocation using Dummy Burst Definition in IEEE 802.16 Uplinks

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  1. Proposal for Radio Resource Allocation using Dummy Burst Definition in IEEE 802.16 Uplinks Takeo Ohseki and Takashi Inoue Radio Access Laboratory, KDDI R&D Laboratories, Inc. Ohara 2-1-15, Fujimino, Saitama, 356-8502, JAPAN WCNC 2008

  2. Outline • Introduction • IEEE 802.16 Systems • Dummy Burst and Radio Resource Allocation Method Considering Inter-cell Interference • Numerical Analysis • Conclusion

  3. Introduction • OFDMA is particularly anticipated in next-generation mobile networks • multipath environments • providing higher throughput and capacity • considerable flexibility in managing spectrum resources • improved coverage

  4. Introduction • Uplinks of IEEE 802.16 • OFDMA • PUSC • In PUSC mode • Each subchannel, which consists of several subcarriers, is allocated to a single user

  5. Introduction • BS allocates the uplink resource • UL burst • UL-MAP • The allocation of subchannels to users • cannot be conducted flexibly • without generating blank logical subchannels

  6. IEEE 802.16 SystemsA. OFDMA uplink subframe structure in IEEE 802.16

  7. IEEE 802.16 SystemsB. OFDMA uplink subchannel permutation in IEEE 802.16 -Tiles(s, n) is the physical tile index in the FFT with tiles being ordered consecutively -s is the subchannel number in the range 0 . . . Nsubchannels − 1 -n is the tile index 0 . . . 5 in a subchannel -UL_PermBase is an integer value in the range 0 . . . 69 -Pt(·) is the tile permutation -index(·, x) denotes the function that returns the x-th element

  8. Dummy Burst and Radio Resource Allocation Method Considering Inter-cell InterferenceA. Introduction of Dummy Burst • In uplinks in the IEEE 802.16 system, data are initially allocated in bursts built on logical subchannels • A permutation of the tiles within a subchannel • map tiles to physical subchannels • If there are some logical subchannels in a bad radio propagation environment, the bursts cannot avoid them

  9. Dummy Burst and Radio Resource Allocation Method Considering Inter-cell InterferenceA. Introduction of Dummy Burst

  10. Dummy Burst and Radio Resource Allocation Method Considering Inter-cell InterferenceB. Radio Resource Allocation using Dummy Burst • As regards interference between cells • UL_PermBase

  11. Dummy Burst and Radio Resource Allocation Method Considering Inter-cell InterferenceB. Radio Resource Allocation using Dummy Burst

  12. Dummy Burst and Radio Resource Allocation Method Considering Inter-cell InterferenceB. Radio Resource Allocation using Dummy Burst

  13. Dummy Burst and Radio Resource Allocation Method Considering Inter-cell InterferenceC. Requirements for realization • 1) About changing UL_PermBase: • UL PermBase must be changed depending on traffic • In the IEEE 802.16 systems, • A control message called Zone IE • The dynamic change in the UL_PermBase can be realized with the message transmitted by the BS

  14. Dummy Burst and Radio Resource Allocation Method Considering Inter-cell InterferenceC. Requirements for realization • 2) Concerning traffic detection: • The centralized control station to control multiple BSs is assumed • All the BSs regularly notify the centralized control station of the logical subchannels that they use.

  15. Dummy Burst and Radio Resource Allocation Method Considering Inter-cell InterferenceC. Requirements for realization • 3) About a default value of UL PermBase: • When dummy bursts are inserted • The same value of UL PermBase must be used between interfering cells

  16. Numerical AnalysisA. Ratio of interfering tiles

  17. Numerical AnalysisA. Ratio of interfering tiles UL_Permbase = 0 BS0 BS1 (BS1)

  18. Numerical AnalysisB. Throughput Performance UL_Permbase = 0 BS0 BS1 UL_Permbase = 2

  19. Numerical AnalysisB. Throughput Performance proposed method Subchannel<30

  20. Numerical AnalysisC. Discussion

  21. Conclusion • The authors proposed a novel concept for the definition of bursts in IEEE 802.16 uplinks • Generating blank logical subchannels between used logical subchannels in uplinks • A radio resource allocation scheme successfully avoiding interference between the cells based • Numerical analysis confirmed that • Throughput performance can improve

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