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Software-Defined Networking (SDN) has great potentials in changing the fragile and complex enterprise networks. One operational challenge to SDN deployment is the settlement of legacy switches. A hybrid SDN consisting of both SDN and legacy switches may be a tradeoff. Nevertheless most of the current SDN control planes can not handle legacy switches. To overcome this problem, we present HybridFlow,...
Modern cloud-based applications are becoming more communication-intensive, posing a challenge for data centers to supply sufficient bandwidth. Current data centers are not optimized for such cloud-based software services. In practice, due to the variability of traffic load, data centers may suffer from lower throughput, as well as higher latency, dramatically reducing quality of service (QoS). This...
With the rapid development of mobile internet and pervasion of Location-Based Service (LBS), location privacy has become an important issue. In this paper, we present DeCache, a modified location privacy protection system model, which pre-caches the user-demanded LBS data. So the mobile users don't have to send the network LBS requests when they need to access LBS. This is more secure than the previous...
To alleviate the growing concern of energy waste in networked devices, we propose an energy saving strategy in the ``server-centric" data center network. Focusing on servers, we introduce a basic scheme based on the transition of automata. By changing efficiently from sleeping state to active state in different network traffic, servers save the energy. This scheme is self-adaptive and simple...
Small playback lag in live streaming is important for time-critical and interactive applications such as live stock, market updates, sports and remote education. In this paper, we present Elite addresses the playback lag problem in peer-assisted live streaming systems. Instead of deploying a large initial offset to all the users, Elite seeks the possibility of initializing users with layered proportional...
It has been well known that network coding can achieve better network throughput in certain topologies by allowing coding at intermediate nodes. However, the benefit of network coding in P2P content distribution is controversial in recent literatures. In this paper, we seek to investigate how network coding performs in a BitTorrent-like protocol from a practical perspective. To validate the benefit...
Short playback lag is preferred in many urgent and interactive scenarios such as live sports and distance education. However, measurement studies have shown that many popular P2P live streaming systems still suffer from long playback lag, say, more than 100 seconds, which makes the live streaming less realtime. Due to the unstructured nature of P2P networks, it is really a challenge to reduce the...
Graphics processing unit (GPU) has evolved into a general-purpose computing platform. Inspired by the GPU technology advantage, this paper concerns the design and performance evaluation of practical GPU-accelerated server architecture for Video-on-Demand (VoD) services with network coding. Following the proposal of an optimized network coding algorithm based on parallel threads on GPU, a GPU-Accelerated...
Video-on-demand (VoD) service on the Internet has been surprisingly popular during these years. And it is being greatly enhanced by the emergence and maturation of both the peer-to-peer (P2P) schema and network coding (NC) technology. P2P-based solution can make VoD systems obtain high scalability. The introduction of network coding improves the content distributing efficiency of the system. Meanwhile,...
P2P Live media streaming is becoming popular in the Internet. There still remain some neglected problems such as playback lag, which is extremely sensitive for users in some urgent and interactive scenarios. In addition, many current studies were based on theoretical assumptions and never be turned into reality. In this paper, we present SonicStream, a full implementation of live P2P media streaming...
Video-on-demand (VoD) service has been greatly enhanced with the maturation of both peer-to-peer (P2P) and network coding (NC) technology. Digital video cassette recording (VCR) function provides users with more freedom that they can choose different playback modes while viewing video clips. Besides, users are able to switch between different scenes with the support of video-segmentation. Based on...
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