Conclusions and Future Work
The research work presented throughout this book are the research results obtained by the author in the past several years. Although there are already some research accomplishments in the DVB-H handover domain, it is still not ready for the technology to
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12.1 Conclusions The research work presented throughout this book are the research results obtained by the author in the past several years. Although there are already some research accomplishments in the DVB-H handover domain, it is still not ready for the technology to be applied in the commercial roll-out due to limited handover field trials and unclear business issues. Therefore, the research results presented in this book are valuable for the commercial implementation of DVB-H and for the future research directions of DVB-H. Each chapter of the book makes one independent reading material for the readers. Chapter 1 of the book described the general background of the telecommunications and broadcast world, the basic technical features of DVB-H and the book structure. Chapter 2 of the book presented the motivations and approaches of the handover research for DVB-H. In this chapter the readers can understand why and how should we conduct the handover research in DVB-H. The readers will also be able to know how can we design a better handover algorithm for DVB-H. The handover algorithms designed in the rest of the book are mainly based on the methods and guidelines regarding to how to design a handover algorithm in Chapter 2. In chapter 3, a complete survey of handover research in DVB-H was presented. The advantages and disadvantages of different handover algorithms were given. The projects IST INSTINCT and IST MING-T were briefly described as examples of the DVB-H handover related projects. Chapter 4 is focusing on the DVB-H signalling information which includes PSI/SI tables, TPS bits, ESG and EPG. Electronic Service Guide (ESG) is no doubt one of the most important technologies in DVB-H. It is important to and connects the service providers, service operators, terminal manufacturers and users. It differentiates DVB IPDC and OMA BCAST standards, so it has to be considered by the service operators for choosing the appropriate standard. In chapter 6, a preliminary investigation of the different handover algorithms in the dedicated DVB-H networks was presented. A comparison of the different handover algorithms was done and a hybrid handover
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12 Conclusions and Future Work
decision-making algorithm for the dedicated DVB-H networks was illustrated. While chapter 7, 8, 10, 11 are targeting different handover algorithms in different networks (chapter 7 and 8 are for dedicated DVB-H networks; chapter 10 is for converged DVB-H/UMTS networks; chapter 11 is for hybrid broadcast networks), chapter 9 is devoted to the soft handover probability calculation of the RA handover algorithm. Handover of the dedicated DVB-H networks will be the first handover algorithm that are going to be implemented. As a short summary for the handover in the dedicated DVB-H networks, Table 12.1 shows the different handover algorithms of the dedicated DVB-H networks presented in this book. Table 12.1 also shows the different algorithms’ targeted handover stages and the problems that these algorithms are focusing on. For comparison, the different handove
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