正交頻分多址系統(tǒng)中一種面向多業(yè)務(wù)應(yīng)用的自適應(yīng)資源分配算法
doi: 10.11999/JEIT141158
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2.
(南京郵電大學(xué)通信與信息工程學(xué)院 南京 210003)
基金項目:
國家自然科學(xué)基金(61372125)，國家973計劃項目(2013CB329104)和東南大學(xué)移動通信國家重點實驗室開放研究基金(2013D01)資助課題
Adaptive Resource Allocation Scheduling Algorithm for Multi-service Application in OFDMA System
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2.
(College of Telecommunications &
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摘要: 針對正交頻分多址(OFDMA)系統(tǒng)下行鏈路多業(yè)務(wù)自適應(yīng)調(diào)度的問題，該文首先以最大化系統(tǒng)吞吐量為優(yōu)化目標(biāo)、每種業(yè)務(wù)的服務(wù)質(zhì)量(QoS)保證為約束條件，建立了一種通用的多業(yè)務(wù)自適應(yīng)資源分配模型。為解決此優(yōu)化問題，提出了一種具體的自適應(yīng)資源調(diào)度算法。該算法對實時業(yè)務(wù)按照用戶選擇最好的信道的原則分配盡可能少的資源以保證其QoS，對非實時業(yè)務(wù)把盡可能多的剩余資源按照信道選擇最好的用戶的原則進(jìn)行分配，充分利用信道資源，提升系統(tǒng)容量。仿真結(jié)果表明，該算法保證了下行OFDMA系統(tǒng)吞吐量的同時，在實時業(yè)務(wù)的延時和丟包率等方面有一定的優(yōu)越性。Abstract: Aimed at the problem of downlink multiservice adaptive scheduling in Orthogonal Frequency-Division Multiple Access (OFDMA) system, a universal model for multiservice adaptive resource allocation is built, which is to maximize system throughput, under the constraints of Quality of Service (QoS) guarantees. In order to resolve this optimization problem, a multiservice adaptive resource scheduling algorithm is proposed. In this algorithm, the real-time service is allocated as little resource as possible to guarantee its QoS by the user choosing the best channel whereas the non-real time service is allocated the residual resource by the channel choosing the best user to increase the system capacity. The simulation results show that the proposed algorithm can guarantee the throughputs of the downlink OFDMA systems and meanwhile have some advantages in aspects of delay and packet dropping rate of real-time services.
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Key words:
- Wireless communication /
- Resource allocation /
- Scheduling /
- Effective capacity /
- OFDMA
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