Service class downlink scheduling in wimax
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Service Class Downlink Scheduling in WiMAX. Joseph Thaliath, Mabel Mary Joy, Elizabeth Priya John and Debabrata Das IEEE Communication Systems Software and Middleware and Workshops, 2008. COMSWARE. Outline. Introduction Service Class Downlink Scheduling (SCDS) Analytical Model For SCDS

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Service Class Downlink Scheduling in WiMAX

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Service class downlink scheduling in wimax

Service Class Downlink Scheduling in WiMAX

Joseph Thaliath, Mabel Mary Joy, Elizabeth Priya John and Debabrata Das

IEEE Communication Systems Software and Middleware and Workshops, 2008. COMSWARE


Outline

Outline

  • Introduction

  • Service Class Downlink Scheduling (SCDS)

  • Analytical Model For SCDS

  • Simulation

  • Conclusion


Introduction

Introduction

  • IEEE 802.16a/d/e WiMAX operates in two

    modes: Point–to–Multi Point (PMP) and mesh modes

  • The BS traffic is expected to be very high during DL compared to UL

  • An effective downlink scheduling scheme for BS is essential to avoid the delays for real time traffic


Service class downlink scheduling scds

Service Class Downlink Scheduling (SCDS)


Analytical model for scds 1 5

Analytical Model For SCDS(1/5)

  • To estimate the arrival pattern (arrival rate), cumulative mean arrival rate (CMAR) of packets fori service in k station for the current downlink frame j is presented as

  • NPik is the number of packets for i service in k station

  • FT is the frame time


Analytical model for scds 2 5

Analytical Model For SCDS(2/5)

The number of packets estimated to arrive in the current frame NEik is calculated as

NEik=CMARik*FT

The metric for each service in a station is given

Sik= NEik


Analytical model for scds 3 5

Analytical Model For SCDS(3/5)

  • Rik is the weighted priority for i service in k station


Analytical model for scds 4 5

Analytical Model For SCDS(4/5)

  • Mk is the metric for kth station which is

    calculated as sum of the weighted priorities of services within the station of the respective service queue

  • The weight or priority for each station can be calculated as


Analytical model for scds 5 5

Analytical Model For SCDS(5/5)

  • Ns is the number of slots available in downlink frame

  • The number of slots Tk for a station within a downlink frame is given as

    Tk= floor (Wk* Ns)

  • Tik is the time slot for i service in k station, and Rik is the weighted priority for each service within that station

    Tik= floor (Rik*Tk)


Simulation parameters

Simulation Parameters


Delay graph for ugs traffic

Delay graph for UGS traffic


Delay graph for ertps traffic

Delay graph for ertPS traffic


Delay graph for rtps traffic

Delay graph for rtPS traffic


Throughput graph for round robin

Throughput graph for Round Robin


Throughtput graph for scds

Throughtput graph for SCDS


Conclusion

Conclusion

  • By SCDS the reduction in delay and enhancement in QoS for real time traffic

  • Future work includes combination of SCDS with channel quality for enhancement of QoS and throughput


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