A Novel Channel Allocation and Scheduling Algorithm in OFDMA System

報告人 : J.SHOW指導教授 : H.H.Liu

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References

Sungho Hwang and Ho-Shin Cho, "A Novel Channel Allocation and Scheduling

Algorithm in OFDMA System," IEEE 64ht Vehicular Technology Conference,

Sept. 2006, page(s):1-5

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Outline

• Introduction – Permutation schemes

• System description• Algorithm– Alternative vector– Jain index

• Numerical result• Conclusion

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Introduction

• Round Robin• Proportional fairness

• This paper – Sub-band divided into group – Alternative vector

Tk : average throughputRk : arrival rate tc : control latency parameterK* : chosen user

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Introduction(cont.)

• This paper AMC (adaptive modulation and coding)

• FUSC (full usage sub-channels)

• PUSC (partial usage sub-channels)

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System description

Cij :channel state of user j using sub-band iF : number of sub-band

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System description(cont.)

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Algorithm

• Step 1– Sub-bands divided into different level group– Sub-bands alternative vector

• Step 2– Allocate users into sub-bands– Users alternative vector

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Sub-band into Group

G : group

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Alternative vectors

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Cij :channel state of user j using sub-band iF : number of sub-band

N : number of users

Jain index (fairness)

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N : total number of users Xi : transmitted data rate for user i

I range : 0 ~ 1

Satisfaction parameter

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Si : satisfaction parameter Rt_i : transmitted rate

Rr_i : required data rate

Use Si substituting Xi

Example

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Sub-band && users allocation

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Sub-bands && users allocation procedure

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Numerical parameters

• 10 sub-bands• 10 TTIs(transmission time intervals ) per frame• 9 AMC level• Channel gain : Rayleigh fading channel model

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: constant (Eb/No)0 : SNR mean of 18dB

AMC level

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Numerical result(throughput)

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Numerical result(fairness)

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Numerical result(satisfaction)

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Conclusion

• AMC level

• Alternative vector– It is Simple– Used in both Sub-band && user

• Satisfaction parameter

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