星載Clos網(wǎng)絡(luò)的全分布式容錯(cuò)調(diào)度算法

劉凱; 晏堅(jiān); 高曉琳; 陸建華

doi:10.11999/JEIT150944

星載Clos網(wǎng)絡(luò)的全分布式容錯(cuò)調(diào)度算法

doi: 10.11999/JEIT150944 cstr: 32379.14.JEIT150944

2.
(清華大學(xué)電子工程系北京 100084) ②(清華大學(xué)宇航中心北京 100084) ③(清華大學(xué)深圳研究生院深圳 518055) ④(北京航天飛行控制中心北京 100094)

基金項(xiàng)目:

國(guó)家自然科學(xué)基金(91338108, 91438206)，中國(guó)電子科技集團(tuán)校企合作基金(空間互聯(lián)網(wǎng)關(guān)鍵技術(shù))

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出版歷程
- 收稿日期: 2015-08-19
- 修回日期: 2016-01-20
- 刊出日期: 2016-06-19

Fully Distributed Fault Tolerant Scheduling for Onboard Clos-network Switching

2.
(Department of Electronic Engineering, Tsinghua University, Beijing 100084, China)

Funds:

The National Natural Science Foundation of China (91338108, 91438206), China Electronics Technology Group School-Enterprise Cooperation Foundation (Key Technology of Space Internet)

摘要

摘要: 針對(duì)星載交換結(jié)構(gòu)受空間輻射影響造成的可靠性嚴(yán)重下降問題，該文提出了一種支持全分布式調(diào)度的三級(jí)Clos網(wǎng)絡(luò)及其全分布式容錯(cuò)(Fully Distributed Fault Tolerant, FDFT)調(diào)度算法，以提高星載交換結(jié)構(gòu)在交叉點(diǎn)故障下的容錯(cuò)能力。該Clos網(wǎng)絡(luò)的中間級(jí)和輸出級(jí)采用聯(lián)合輸入交叉點(diǎn)隊(duì)列，以支持Clos網(wǎng)絡(luò)和交換單元內(nèi)部的全分布式調(diào)度。FDFT采用一種分布式故障檢測(cè)算法獲得交叉點(diǎn)故障信息?；趯?duì)交叉點(diǎn)故障影響范圍的分析，F(xiàn)DFT在輸入級(jí)采用一種容錯(cuò)信元分發(fā)算法，實(shí)現(xiàn)無故障路徑的負(fù)載均衡。理論分析證明，當(dāng)任一輸入/輸出級(jí)交換單元故障個(gè)數(shù)不超過(m-n)或所有中間級(jí)交換單元故障個(gè)數(shù)不超過(m-n)時(shí)，其中m, n分別為輸入級(jí)交換單元輸入、輸出端口數(shù)，F(xiàn)DFT能夠達(dá)到100%吞吐率。仿真結(jié)果進(jìn)一步驗(yàn)證，故障隨機(jī)發(fā)生情況下，F(xiàn)DFT能夠抵抗比故障任意發(fā)生情況下更多的故障，且在不同的業(yè)務(wù)場(chǎng)景下具有良好的吞吐率和時(shí)延性能。
- 星載交換 /
- Clos網(wǎng)絡(luò) /
- 全分布式 /
- 容錯(cuò)調(diào)度 /
- 負(fù)載均衡
Abstract: For an onboard switching, serious decline in the reliability is induced by the harsh space radiation environment. In this paper, a 3-stage Clos-network supporting fully distributed scheduling and a Fully Distributed Fault Tolerant (FDFT) scheduling algorithm are proposed to improve fault-tolerant ability of an onboard switching. Combined input and output queued architecture is employed in the central and output stages of the proposed Clos-network to support fully distributed scheduling in both the network and switching elements. In FDFT, a distributed fault detection algorithm is employed to obtain the crosspoint fault information. Based on the analysis of the influence of the faults, a fault-tolerant cell dispatching algorithm is proposed in the input stage which achieves load-balancing to fault-free paths. Theoretical analysis demonstrates that 100% throughput is achieved when no more than(m-n) crosspoint faults occur in any input/output module or in all central modules, where m and n are the number of inputs and outputs of input module, respectively. Furthermore, simulation results indicate that, in the case of faults occurring randomly, FDFT tolerates much more faults, and exhibits a good performance in terms of throughput and average cell delay under different traffic scenarios.
- Onboard switching /
- Clos-network /
- Fully distributed /
- Fault-tolerant scheduling /
- Load balancing

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參考文獻(xiàn)(19)

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