Classification and scheduling are key functionalities of a network processor. Network processors are equipped with application specific integrated circuits (ASIC), so that as IP (Internet Protocol) packets arrive, they can be processed directly without using the central processing unit. A new network processor is proposed called the video network processor (VNP) for real time broadcasting of video streams for IP television (IPTV). This thesis explores the challenge in designing a combined classification and scheduling module for a VNP. I propose and design the classifier-scheduler module which will classify and schedule data for VNP. The proposed module discriminates between IP packets and video packets. The video packets are further processed for digital rights management (DRM). IP packets which carry regular traffic will traverse without any modification. Basic architecture of VNP and architecture of classifier-scheduler module based on content addressable memory (CAM) and random access memory (RAM) has been proposed. The module has been designed and simulated in Xilinx 9.1i; is built in ISE simulator with a throughput of 1.79 Mbps and a maximum working frequency of 111.89 MHz at a power dissipation of 33.6mW. The code has been translated and mapped for Spartan and Virtex family of devices.

Multiple threads can run concurrently on multiple cores in a multicore system and improve performance/power ratio. However, effective core allocation in multicore and manycore systems is very challenging. In this thesis, we propose an effective and scalable core allocation strategy for multicore systems to achieve optimal core utilization by reducing both internal and external fragmentations. Our proposed strategy helps evenly spreading the servicing cores on the chip to facilitate better heat dissipation. We introduce a multi-stage power management scheme to reduce the total power consumption by managing the power states of the cores. We simulate three multicore systems, with 16, 32, and 64 cores, respectively, using synthetic workload. Experimental results show that our proposed strategy performs better than Square-shaped, Rectangle-shaped, L-Shaped, and Hybrid (contiguous and non-contiguous) schemes in multicore systems in terms of fragmentation and completion time. Among these strategies, our strategy provides a better heat dissipation mechanism. / by Manira S. Rani. / Thesis (M.S.C.S.)--Florida Atlantic University, 2011. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2011. Mode of access: World Wide Web.

Centralized light source (CLS) at the central office is an attractive solution for low-cost implementation of WDM-PON, as it eliminates the need of wavelength-specific transmitters and wavelength management at the optical network units (ONU). CLS can be realized by either a carrier-distributed scheme or a remodulation scheme. In both schemes, however, the upstream signal is susceptible to the interferometric crosstalk induced by the beating between the upstream signal and the back-reflected light due to the intrinsic Rayleigh Backscattering (RB), both of which are of the same wavelength. We propose and demonstrate a simple and novel scheme to suppress the RB noise in the carrier-distributed WDM-PON. Differential phase-shift keying (DPSK) is used as the upstream modulation format and the destructive port of the delay-interferometer (DI) is employed to demodulate the upstream DPSK signal. As the spectrum of RB towards the OLT is narrow due to the very narrow spectrum of the distributed carrier, the RB noise can be considerably rejected by the notch filter-like destructive port of the DI at the OLT, which is used simultaneously to demodulate the upstream DPSK signal. The scheme can also be extended to the application in the remodulation-based WDM-PON, as long as the downstream signal has a narrow spectrum (i.e. via reducing downstream modulation depth). A unique feature of the DPSK signal with reduced modulation depth (RMD-DPSK) is that it can be demodulated by DI's destructive port without extinction ratio (ER) degradation, whereas the demodulated signal from DI's destructive port has a very low ER and can be used as the source for upstream remodulation. We also proposed a novel offset-Manchester coding to suppress Rayleigh noise in electrical domain via a postdetection high-pass filter. / Foreseeing the rapidly growing demand for multimedia services and the trend of service convergence, the penetration of optical fiber in access network is an ultimate solution to break the last-mile bottleneck imposed by the 100-year-old copper network. One of the most promising solutions to realize optical access is the passive optical network (PON), in which the network infrastructure is shared by many subscribers and has no active elements between the central office and the customer. Thus a PON requires neither electrical power nor active management, leading to effective reduction in operational expenses. Time-division-multiplexed passive optical networks (TDM-PONs) such as Ethernet PON (EPON) and Gigabit PON (GPON) are being widely deployed in current fiber-based access networks for providing broadband access, offering triple-play services including video, data and voice. In the near future, wavelength-division-multiplexed passive optical network (WDM-PON) can be the enabler of the next-generation optical broadband access that requires large dedicated and symmetric bandwidth, data privacy, and upgrade flexibility. TDM-PONs also can benefit from WDM technologies for capacity upgrade. / With more diverse multimedia and data services available for broadband access, the access network has to be flexible enough to cope with various data or video delivery such as broadcast/multicast services, in addition to the point-to-point traffic. Multicast is more attractive, compared to broadcast, as it allows selective control of the connection for each subscriber individually. Multicast can be easily realized in TDM-PONs as it employs power-splitting at the remote node (RN). However, it is more challenging in WDM-PONs, due to the dedicated connection between the optical line terminal (OLT) and each ONU. Many studies have been carried out to solve this problem. The prior schemes either need relatively complicated multicast control and/or cannot support future proof 10-Gb/s symmetric point-to-point (PtP) transmission. We proposed a novel multicast control scheme for a WDM-PON with 10-Gb/s symmetric bit rate. The multicast data encoded in DPSK format is superimposed onto all PtP channels modulated in inverse return-to-zero format. With an athermal Dr being used at the ONU to demodulate the DPSK signal, the multicast data can be effectively disabled by slight detuning the laser wavelength at OLT, which has negligible effect on the PtP data. The proposed scheme differs from all the previous schemes in that, the multicast control is realized via the inherent wavelength management of WDM systems, rather than via any other additional adjustment such as ER, synchronization, and polarization. v / Xu, Jing. / Adviser: Lian-Kuan Chen. / Source: Dissertation Abstracts International, Volume: 73-06, Section: B, page: . / Thesis (Ph.D.)--Chinese University of Hong Kong, 2011. / Includes bibliographical references. / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [201-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese.

Chan Kwun-chung. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2001. / Includes bibliographical references (leaves 71-73). / Abstracts in English and Chinese. / 摘要 --- p.II / ABSTRACT --- p.III / ACKNOWLEDGEMENT --- p.V / TABLE OF CONTENTS --- p.VI / LIST OF FIGURES --- p.X / LIST OF SYMBOLS --- p.XII / Chapter 1. --- INTRODUCTION --- p.1 / Chapter 1.1 --- Contributions --- p.3 / Chapter 1.2 --- Organization of the Thesis --- p.4 / Chapter 1.3 --- Publications --- p.5 / Chapter 2. --- RELATED WORKS --- p.6 / Chapter 2.1 --- Previous VOD System --- p.7 / Chapter 2.1.1 --- Service Model --- p.7 / Chapter 2.1.1.1 --- Unicast VOD --- p.7 / Chapter 2.1.1.2 --- Multicast VOD --- p.8 / Chapter 2.1.2 --- Architecture --- p.9 / Chapter 2.1.2.1 --- Centralized Architecture --- p.9 / Chapter 2.1.2.2 --- Distributed Architecture --- p.10 / Chapter 2.1.3 --- Interactive Function --- p.11 / Chapter 2.1.3.1 --- Limited Interactive Function --- p.11 / Chapter 2.1.3.2 --- Unlimited Interactive Function --- p.11 / Chapter 2.1.4 --- Split and Merge Operation --- p.12 / Chapter 2.1.4.1 --- SAM Scheme (Split and Merge) --- p.12 / Chapter 2.1.4.2 --- SRMDRU Scheme (Single Rate Multicast Double Rate Unicast) --- p.14 / Chapter 2.2 --- Previous Caching Algorithm --- p.15 / Chapter 2.2.1 --- LFU (Least Frequently Used) --- p.15 / Chapter 2.2.2 --- LRU (Least Recently Used) --- p.15 / Chapter 2.2.3 --- Media Stream Caching --- p.15 / Chapter 3. --- DESIGN OFA NOVEL VOD SYSTEM --- p.17 / Chapter 3.1 --- System Architecture --- p.18 / Chapter 3.1.1 --- Multicast Video Server Cluster (MVSC) --- p.19 / Chapter 3.1.2 --- Unicast Video Server Cluster (UVSC) --- p.20 / Chapter 3.1.3 --- Multicast Backbone Network (MBN) --- p.20 / Chapter 3.1.4 --- Local Distribution Network (LDN) --- p.21 / Chapter 3.1.5 --- Distributed Interactive Server (DIS) --- p.21 / Chapter 3.1.6 --- Distributed Proxy Server (DPS) --- p.22 / Chapter 3.1.7 --- Client Station (CS) --- p.22 / Chapter 3.2 --- Batched Multicast Transmission --- p.24 / Chapter 3.3 --- Split and Merge Operation --- p.26 / Chapter 3.4 --- Interactive Function --- p.31 / Chapter 3.4.1 --- Pause --- p.31 / Chapter 3.4.2 --- Slow Motion --- p.35 / Chapter 3.4.3 --- Various Speed Fast Forward / Fast Rewind (FF/REW) --- p.37 / Chapter 3.4.4 --- Jump Forward/Jump Backward (JF/JB) --- p.42 / Chapter 3.5 --- Performance Analysis --- p.46 / Chapter 3.5.1 --- Model --- p.46 / Chapter 3.5.2 --- System Parameters --- p.49 / Chapter 3.5.3 --- Results --- p.49 / Chapter 4. --- DESIGN OF A VIDEO PROXY SYSTEM --- p.57 / Chapter 4.1 --- Video Proxy System --- p.58 / Chapter 4.1.1 --- Priority Function --- p.59 / Chapter 4.1.2 --- Two-Stage Replacement Policy --- p.60 / Chapter 4.1.3 --- Caching Policy --- p.61 / Chapter 4.2 --- Performance Evaluation --- p.63 / Chapter 4.2.1 --- Simulation Environment --- p.63 / Chapter 4.2.2 --- Performance Metric --- p.64 / Chapter 4.2.3 --- Results --- p.64 / Chapter 5. --- CONCLUSION --- p.69 / BIBLIOGRAPHY --- p.71

by Ng Chi Ho. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2001. / Includes bibliographical references (leaves 64-65). / Abstracts in English and Chinese. / ABSTRACT --- p.I / ACKNOWLEDGEMENT --- p.II / TABLE OF CONTENTS --- p.III / LIST OF TABLES --- p.VI / LIST OF FIGURES --- p.VII / LIST OF ABBREVIATIONS --- p.X / Chapter CHAPTER 1 --- INTRODUCTION --- p.1 / Chapter 1.1 --- Overview --- p.1 / Chapter 1.2 --- Related works --- p.5 / Chapter 1.3 --- Organization of this Thesis --- p.6 / Chapter CHAPTER 2 --- BACKGROUND --- p.7 / Chapter 2.1 --- Introduction to VOD Systems --- p.7 / Chapter 2.1.1 --- Pure unicast VOD System --- p.8 / Chapter 2.1.2 --- Pure multicast VOD System --- p.9 / Chapter 2.1.3 --- Centralized VOD System --- p.9 / Chapter 2.1.4 --- Distributed VOD System --- p.10 / Chapter 2.1.5 --- Hybrid VOD System (DINA) --- p.11 / Chapter 2.1.6 --- Comparisons --- p.12 / Chapter 2.2 --- Interactive Functions --- p.14 / Chapter 2.2.1 --- Speedup --- p.14 / Chapter 2.2.2 --- Split and merge (I and S streams) --- p.14 / Chapter 2.2.3 --- Prerecord --- p.15 / Chapter 2.3 --- Error Recovery --- p.16 / Chapter 2.3.1 --- Pure FEC --- p.17 / Chapter 2.3.2 --- Pure ARQ --- p.17 / Chapter 2.3.3 --- Hybrid ARQ --- p.18 / Chapter 2.3.4 --- Rate-Compatible Punctured Convolutional Codes --- p.18 / Chapter CHAPTER 3 --- HYBRID MULTICAST-UNICAST VOD SYSTEM --- p.21 / Chapter 3.1 --- System Overview --- p.21 / Chapter 3.1.1 --- VSC (Video Server Cluster) --- p.22 / Chapter 3.1.2 --- DIS (Distributed Interactive Server) --- p.24 / Chapter 3.1.3 --- NAK (Negative Acknowledgement Server) --- p.25 / Chapter 3.1.4 --- CS (Client Stations) --- p.26 / Chapter 3.1.5 --- MBN (Multicast Backbone Network) --- p.27 / Chapter 3.1.6 --- LDN (Local Distribution Network) --- p.27 / Chapter 3.2 --- Interactive Functions --- p.28 / Chapter 3.2.1 --- Hybrid Multicast- Unicast --- p.28 / Chapter 3.2.2 --- Pause --- p.30 / Chapter 3.2.3 --- Slow Forward (SF) --- p.33 / Chapter 3.2.4 --- Slow Backward (SB) --- p.35 / Chapter 3.2.5 --- Fast Forward (FF) / Fast Backward (FB) --- p.38 / Chapter 3.2.6 --- Jump Forward (JF) / Jump Backward (JB) --- p.41 / Chapter 3.3 --- System Performance --- p.46 / Chapter 3.3.1 --- System Model --- p.46 / Chapter 3.3.2 --- Simulation Results --- p.47 / Chapter 3.3.3 --- Trade off --- p.53 / Chapter CHAPTER 4 --- DISTRIBUTED TYPE-II HARQ --- p.54 / Chapter 4.1 --- Algorithm Description --- p.54 / Chapter 4.1.1 --- Design details --- p.54 / Chapter 4.1.2 --- Simulation Results --- p.59 / Chapter CHAPTER 5 --- CONCLUSION --- p.62 / BIBLIOGRAPHY --- p.64

by Patrick C.K. Wu. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1998. / Includes bibliographical references (leaves 57-[59]). / Abstract also in Chinese. / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Research Objectives --- p.2 / Chapter 1.2 --- Organization of the Thesis --- p.2 / Chapter 2 --- Background --- p.4 / Chapter 2.1 --- Reliable Multicasting --- p.4 / Chapter 2.2 --- Related Work --- p.5 / Chapter 2.2.1 --- RMTP --- p.5 / Chapter 2.2.2 --- RMP --- p.6 / Chapter 2.2.3 --- RAMP --- p.7 / Chapter 2.3 --- Multicast with Scalable Reliability (MSR) --- p.8 / Chapter 3 --- Traffic Shaping in MSR --- p.10 / Chapter 3.1 --- Single Queue System --- p.11 / Chapter 3.2 --- Scaling factor α --- p.12 / Chapter 4 --- Retransmission Scheme in MSR --- p.15 / Chapter 4.1 --- Packet Loss Detection and Requests for Retransmission at the Receivers --- p.17 / Chapter 4.2 --- Retransmission at the Sender --- p.19 / Chapter 4.3 --- Dynamic Adjustment of Retransmission Timeout Value --- p.22 / Chapter 4.4 --- Scaling Reliability using Transmit-Display Window --- p.29 / Chapter 5 --- NACK Implosion Prevention --- p.31 / Chapter 5.1 --- Electing a Representative Receiver --- p.32 / Chapter 5.2 --- Determining T --- p.33 / Chapter 5.3 --- Determining β --- p.34 / Chapter 6 --- Performance Study of MSR --- p.38 / Chapter 6.1 --- Performance Study of MSR in Simple Network Topologies --- p.39 / Chapter 6.2 --- Star Topology --- p.40 / Chapter 6.3 --- Tree Topology --- p.44 / Chapter 6.4 --- Exploring the use of MSR Gateway --- p.47 / Chapter 7 --- Conclusion and Future Work --- p.50 / Chapter 7.1 --- Future Work --- p.50 / Chapter 7.2 --- Conclusions --- p.51 / Chapter A --- MSR Packet Formats --- p.52 / Chapter A.1 --- MSR Fixed Header --- p.52 / Chapter A.2 --- MSR Audio Data Header --- p.54 / Chapter A.3 --- MSR NACK Packets --- p.55 / Bibliography --- p.57

To Ka Ki. / Thesis submitted in: August 2005. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2006. / Includes bibliographical references (leaves 55-56). / Abstracts in English and Chinese. / Acknowledgement --- p.i / Abstract --- p.ii / 摘要 --- p.iii / Chapter Chapter 1 --- INTRODUCTION --- p.5 / Chapter Chapter 2 --- related WORKS --- p.12 / Chapter Chapter 3 --- Decentralization of Periodic Broadcasting --- p.16 / Chapter 3.1 --- Staggered Broadcasting --- p.16 / Chapter 3.2 --- Modified Staggered Broadcasting --- p.17 / Chapter Chapter 4 --- PEERS SYNCHRONIZATION --- p.21 / Chapter 4.1 --- Integrating PCS with Periodic Broadcasting --- p.22 / Chapter 4.2 --- Distributed PCS --- p.23 / Chapter Chapter 5 --- Performance Evaluations of Decentralized Periodic Broadcasting Architecture --- p.27 / Chapter 5.1 --- Sensitivity to Clock Drift --- p.28 / Chapter 5.2 --- System Dynamic Behavior --- p.30 / Chapter Chapter 6 --- P-NICE --- p.33 / Chapter 6.1 --- The Original NICE Protocol --- p.34 / Chapter 6.2 --- Parallel Overlay Architecture --- p.35 / Chapter 6.3 --- Control Overheads --- p.37 / Chapter Chapter 7 --- Performance Evaluations of P-NICE --- p.39 / Chapter 7.1 --- End-to-End Packet Delivery Ratio --- p.40 / Chapter 7.2 --- Utilization of Network Links --- p.41 / Chapter 7.3 --- Convergence Time of End-to-End Packet Delivery Ratio --- p.44 / Chapter 7.4 --- Effect of Number of Overlays --- p.45 / Chapter 7.5 --- End-to-End Data Delivery Delay --- p.47 / Chapter 7.6 --- Load Balance of Overlays --- p.47 / Chapter 7.7 --- Peers Reception Quality --- p.48 / Chapter 7.8 --- Control Overheads --- p.51 / Chapter Chapter 8 --- Conclusions --- p.53 / Bibliography --- p.55

"Recently the Internet has been increasingly used for multi-party applications like video-conferencing, video-on-demand and shared white-boards. Multicast extensions to IP to support multi-party applications are best effort, often resulting in packet loss within the network. Since some multicast applications can not tolerate packet loss, most of the existing reliable multicast schemes recover each and every lost packet. However, multimedia applications can tolerate a certain amount of packet loss and are sensitive to long recovery delays. We propose a new loss recovery technique that selectively repairs lost packets based upon the amount of packet loss and delay expected for the repair. Our technique sends a special WAIT message down the multicast tree in the event a loss is detected in order to reduce the number of retransmission requests. We also propose an efficient sender initiated multicast trace-route mechanism for determining the multicast topology and a mechanism to deliver the topology information to the multicast session participants. We evaluate our proposed technique using an event driven network simulator, comparing it with two popular reliable multicast protocols, SRM and PGM. We conclude that our proposed WAIT protocol can reduce the overhead on a multicast session as well as improve the average end-to-end latency of the session."

Thesis (Ph. D.)--Ohio State University, 2007. / Title from first page of PDF file. Includes bibliographical references (p. 119-123).

Recently, there has been a global trend among the telecommunication industry on the rapid deployment of IPTV (Internet Protocol Television) infrastructure and services. While the industry rushes into the IPTV era, the comprehensive understanding of the status and dynamics of IPTV network lags behind. Filling this gap requires in-depth analysis of large amounts of measurement data across the IPTV network. One type of the data of particular interest is device or system log, which has not been systematically studied before. In this dissertation, we will explore the possibility of utilizing system logs to serve a wide range of IPTV network management purposes including health monitoring, troubleshooting and performance evaluation, etc. In particular, we develop a tool to convert raw router syslogs to meaningful network events. In addition, by analyzing set-top box (STB) logs, we propose a series of models to capture both channel popularity and dynamics, and users' activity on the IPTV network.