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Resource Allocation and Power Control for Mobile Relay in TDD-OFDMA Downlink

Resource Allocation and Power Control for Mobile Relay in TDD-OFDMA Downlink. Dae Wook Byun , Young Min Cho, Dong Ku Kim Yonsei University, School of Electrical and Electronic Engineering ICCIT 2008. Outline. Introduction System model Proposed schemes Subchannel allocation scheme

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Resource Allocation and Power Control for Mobile Relay in TDD-OFDMA Downlink

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  1. Resource Allocation and Power Control for Mobile Relay in TDD-OFDMA Downlink Dae WookByun, Young Min Cho, Dong Ku Kim Yonsei University, School of Electrical and Electronic Engineering ICCIT 2008

  2. Outline • Introduction • System model • Proposed schemes • Subchannel allocation scheme • MRS power control scheme • Simulation • Conclusion

  3. Introduction • Motivation • Most of the researches about relay-aided system have been focused only on the fixed relay station • mobile relay station (MRS) is worth to be considered because it can be used with relatively cheaper cost than that of FRS

  4. Introduction • Goal • subchannel allocation and relay power control to enhance the cell throughput and expand the service coverage

  5. Introduction • Non-transparent RS

  6. System model • Carrier to interference ratio (C/I) reported to BS BS RS MS

  7. System model • Simple-relay aided resource allocation • n-thsubchannel • MS i • Time t instantaneous supportable data rate of the direct path BS RS MS

  8. System model • Simple-relay aided resource allocation BS RS MS 5 b/s,10b/s Worst-link = (1/2)min( 5 , 10 ) = 2.5b/s Per-link = 1/(1/5 + 1/10) = 3.3b/s

  9. BS Subchannel allocation scheme RS • OVSA BS RS RS MS MS MS

  10. BS Subchannel allocation scheme RS • OVSA BS RS RS MS MS MS

  11. BS Subchannel allocation scheme RS • OVSA BS RS RS MS MS MS

  12. Subchannel allocation scheme • ORSA BS

  13. MRS power control scheme • Simplified on-off mobile relay control (SOMRC) • the number of combinations taken into account is 2M+N • N is number of cells • M is number of relays within cell

  14. MRS power control scheme • Simplified on-off mobile relay control (SOMRC) • Step1 MRS-on MRS-off

  15. MRS power control scheme • Simplified on-off mobile relay control (SOMRC) • Step2 MRS-on MRS-off

  16. MRS power control scheme • Simplified on-off mobile relay control (SOMRC) • Step3 MRS-on MRS-off

  17. Simulation • 19 cells with frequency reuse of 1 and cell radius is 1km • 7 clusters using wrap-around cell structure • MSs are distributed uniformly in BSs • number of MSs per cell is assumed from 1 to 30 • number of MRSs per cell is assumed 1, 3, and 6 • The MRSs move having random direction and constant speed of 42 km/h

  18. Simulation

  19. Simulation

  20. Simulation

  21. Simulation

  22. Simulation

  23. Conclusion • This paper proposed to enhance the cell throughput and expand the service coverage for the IEEE 802.16j downlink system with mobile relays • OVSA with SOMRC provided larger cell throughput than OVSA without MRS power control • OVSA with SOMRC scheme showed the best service coverage performance

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