| 1. |
- Chen, Jiajia, et al.
(author)
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A novel hierarchical algorithm for intra-ONU scheduling in an ethernet passive optical network
- 2005
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In: Network Architectures, Management, and Applications III. - : SPIE. ; , s. W220-W220
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Conference paper (peer-reviewed)abstract
- The quality of service (QoS) requirements of end users and services are totally different, and thus the multi-oriented (user-oriented and service-oriented) scheduling for access networks based on a remote scheduling system especially for EPONs is desired to replace the single-oriented (user-oriented or service-oriented) scheduling. In this paper we introduce a novel hierarchical algorithm of intra-ONU scheduling for multi-oriented QoS, which can guarantee both the priority of the differentiated services and the fairness of the different users. Numerical results have shown that our overall scheduling algorithm can fulfill various requirements of delay and throughput for the transmission of multimedia traffic for each end user.
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| 2. |
- Chen, Jiajia, et al.
(author)
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A novel protection scheme for a hybrid WDM/TDM PON
- 2007
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In: NETWORK ARCHITECTURES, MANAGEMENT, AND APPLICATIONS V. - : SPIE. ; , s. F7840-F7840
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Conference paper (peer-reviewed)abstract
- This paper proposes a novel protection scheme based on the cyclic property of an array waveguide grating (AWG) and neighboring connection pattern between two adjacent optical network units (ONUs) for the hybrid WDM/TDM passive optical networks (PONs). Our scheme uses 50% fewer wavelengths while offering one order of magnitude better connection availability than the existing scheme.
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| 3. |
- Gong, Yu, et al.
(author)
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Passive optical interconnects at top of the rack : offering high energy efficiency for datacenters
- 2015
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In: Optics Express. - 1094-4087. ; 23:6, s. 7957-7970
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Journal article (peer-reviewed)abstract
- This paper introduces a new concept, namely passive optical interconnect at top of the rack in the datacenter networks, and investigates several architectures, which use only passive optical components to interconnect different servers. In such a manner, the proposed schemes are able to offer higher bandwidth and significantly improve energy efficiency compared to their electronic counterpart that is based on commodity switches. The proposed passive optical interconnect schemes are experimentally demonstrated in order to validate the transmission performance. Besides, an assessment in terms of energy consumption and cost has also been carried out, which shows our proposed concept can significantly outperform the conventional commodity switches on energy efficiency while keeping the cost in the similar level.
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| 4. |
- Gong, Yu, et al.
(author)
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Passive Optical Interconnects at Top of the Rack for Data Center Networks
- 2014
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In: 2014 INTERNATIONAL CONFERENCE ON OPTICAL NETWORK DESIGN AND MODELING. ; , s. 78-83
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Conference paper (peer-reviewed)abstract
- Limited scalability of the current commodity switches in terms of capacity and power consumption becomes a bottleneck of the development of data center networks. To solve this problem, optical switches have been proposed to interconnect different servers inside the data centers. However, most of such work has focused on core switches, which handle the communications among different racks inside the data centers as well as interfaces to Internet. In fact intra-rack communications dealing with the traffic inside a single rack in the data centers could also take up a substantial proportion of the total traffic in the data center networks, in particular for cloud computing. With this in mind, this paper proposes novel architectures based on passive optical interconnect at top of the rack (ToR) for data center networks inheriting the advantages of passive optical network (PON) technologies. With reliable and stable passive optical components, intra-rack communications can be realized in an optical domain rather than the conventional electrical switches at ToR. In such a manner, our schemes have a great potential to offer higher bandwidth and reduce power consumption. The transmission performance evaluation carried out by both simulation and experiments has verified the feasibility of the proposed architectures for passive optical interconnects.
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| 5. |
- Shen, Xiaoman, et al.
(author)
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Heterogeneous LTE/DSRC Approach to Support Real-time Vehicular Communications
- 2018
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In: 2018 10TH INTERNATIONAL CONFERENCE ON ADVANCED INFOCOMM TECHNOLOGY (ICAIT). - : IEEE. ; , s. 122-127
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Conference paper (peer-reviewed)abstract
- Vehicle-to-everything (V2X) communications have become a key enabler for future autonomous driving by providing sensing and cooperation abilities beyond traditional on-board sensors. The main candidate technologies for V2X communications are dedicated short range communication (DSRC)/IEEE 802.11p and long-term evolution (LTE), each of which has its own strengths and weaknesses. DSRC provides low-latency direct connectivity, but suffers from serious link degradation and reliability issues. On the other hand, LTE is able to provide high capacity data transmission, while its latency remains an issue due to the long transmission time interval. Integrating these two radio technologies as a heterogeneous solution is promising to complement each other and support V2X applications with differentiated service requirements. This paper proposes a service-aware radio access technology (RAT) selection algorithm that enables a heterogeneous LTE/DSRC solution, where LTE and/or DSRC are selected according to services. Each vehicle is assumed to be equipped with both LTE and DSRC interfaces. The heterogeneous solution selects RAT based on the services requirements with consideration of the networks performance. The solution is implemented with integration of the C-ITS standard and validated through the OMNet++ and SUMO based network simulator. A see-through scenario, where a fleet of vehicles require real-time video data sharing to assist efficient driving, is considered. The simulation results demonstrate that the proposed approach outperforms the purely DSRC approach significantly and is able to simultaneously support safety message transmission with low latency, video streaming with high bandwidth requirements, and other applications with different service requirements.
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| 6. |
- Shen, X., et al.
(author)
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Medium access control protocol and resource allocation for passive optical interconnects
- 2017
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In: Journal of Optical Communications and Networking. - : Institute of Electrical and Electronics Engineers Inc.. - 1943-0620 .- 1943-0639. ; 9:7, s. 555-562
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Journal article (peer-reviewed)abstract
- Passive optical interconnects (POIs) have recently been considered as a promising solution to offer high bandwidth and low power consumption for data center networks. This paper proposes a medium access control protocol for a POI based on arrayed waveguide gratings (AWGs) to facilitate efficient collision-free communications. In order to efficiently accommodate bursty traffic generated by the servers in the data center, we develop a tailored dynamic bandwidth allocation (DBA) algorithm, which is able to schedule resources in both time and spectrum. In the simulation, not only the impact of DBA algorithm parameters but also the system configurations, such as wavelength tuning time, line rate, and the size of the interconnect, have been investigated. For a typical link utilization on an optical interconnect at the top of the rack, the proposed resource allocation scheme ensures both low latency (<0.1 ms) and a low frame drop ratio (almost zero).
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| 7. |
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| 8. |
- Chen, Biao, et al.
(author)
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Efficient and fine scheduling algorithm for bandwidth allocation in Ethernet passive optical networks
- 2006
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In: IEEE Journal of Selected Topics in Quantum Electronics. - 1077-260X .- 1558-4542. ; 12:4, s. 653-660
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Journal article (peer-reviewed)abstract
- A novel fine scheduling algorithm is introduced for upstream bandwidth allocation in an Ethernet-based passive optical network. This scheduling algorithm consists of an inter optical network unit (ONU) scheduler at the optical line terminal (OLT) and an intra-ONU scheduler at each ONU. In the inter-ONU scheduling, a novel GATE/REPORT approach is introduced to eliminate the unused remainders without transmission delay and maximize the utilization of bandwidth. Our novel intra-ONU scheduler gives fair bandwidth allocation to the queues of different priorities for each user in a hierarchical and decentralized way. Numerical results have shown that our overall scheduling algorithm can fulfill various requirements of delay and throughput for the transmission of multimedia traffic for each end user..
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| 9. |
- Chen, Jiajia, 1981-, et al.
(author)
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Analytical Formulas for Calculating the Blocking Probability of a Dynamic Star Network
- 2005
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In: Chinese Optics Letters. - : Optical Society of America. - 1671-7694. ; 3:10, s. 579-582
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Journal article (peer-reviewed)abstract
- For a dynamic routing and wavelength assignment (RWA) a star topology is shown to be more efficient in comparison with a ring topology. Analytical formulas for a dynamic RWA in a star network are presented and verified with virtual simulation.
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| 10. |
- Chen, Jiajia, et al.
(author)
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High utilization of wavelengths and simple interconnection between users in a protection scheme for passive optical networks
- 2008
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In: IEEE Photonics Technology Letters. - 1041-1135 .- 1941-0174. ; 20:5-8, s. 389-391
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Journal article (peer-reviewed)abstract
- A novel protection architecture for passive optical networks (PONs) is presented and evaluated. It is based on the cyclic property of arrayed waveguide gratings (AWGs) and the interconnection between two adjacent optical network units. The proposed scheme is compatible with both wavelength-division-multiplexing (WDM) PONs and hybrid WDM/time-division-multiplexing PONs. It is compared with two existing schemes and shown to have several advantages: 1) 50% less wavelengths is needed; 2) the fiber interconnections are simplified; 3) the connection availability is improved by one order of magnitude.
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