DigiraI Video Broadcasting for Handhelds (DVB-H) is the latest DVB standardfrom the DVB Group targeting handheld, battery powered devices such as mobjle telephones, PDAs(Persona1 Digital Assistants). etc. DVB-H enables IP data services including low definition TV services to be received on battery powered handheld terminals. Time Division Multiplexing (TOM, is the technology that is usually used in computer and telecommunication systems for resoursce allocation. Time slicing is based on TDM and is one of the characteristics of DVB-H. This paper presents a basic model for predicting the power saving achieved by the time slicing algorithm used in DVB-Hfollowed by analysis of theperformance ofthe algorithm based on simulations using Matlab and Opnet; The simulations required the writing of Matlab and Opnet code to model the esfect oftime slicing. The model and simulations presented illustrate the significant power savings that can be achieved by time slicing.
igital Video Broadcasting -Terrestrial (DVB-T) was not only designed for transmitting TV-like video contents but also for transmitting data services [1][2][3]. Digital Video Broadcasting -Handheld (DVB-H) [4][5][6], formerly known as "DVB-X" [7], is a unidirectional communication technology based on DVB-T. DVB-H and DVB-T were developed by the organization called DVB Project [8]. Recently, the DVB ad-hoc group Convergence of Broadcast and Mobile Services (CBMS) developed IPDC (IP Datacast) [9] over the DVB-H standard [10], which is currently being processed by the European Telecommunications Standards Institute (ETSI). The IPDC over DVB-H standard complements the DVB-H standard by defining OSI layers 3-7 and refining some of the OSI layer 2 specific protocols, especially Program Specific Information (PSI) and Service Information (SI).DVB-H poses novel challenges for handover research. Before talking about the origin of the handover issues in DVB-H it is necessary to take a look at the services that are transmitted in DVB-H networks. The service contents in DVB-H networks are delivered in the form of IP datagrams using IP-based mechanisms or in the form of other network layer datagrams encapsulated into Multi-Protocol Encapsulation (MPE) sections [11]. This kind of service is called IPDC. Although IPDC services can be offered via existing GPRS or UMTS cellular networks by Multimedia Broadcast/Multicast Service (MBMS) [12][13][14]
D S U R V E Y S I E E E C O M M U N I C A T I O N S T h e E l e c t r o n i c M a g a z i n e o f O r i g i n a l P e e r -R e v i e w e d S u r v e y A r t i c l e s XIAODONG YANG, GOETTINGEN UNIVERSITY JANI VÄRE, NOKIA CORPORATION THOMAS J. OWENS, BRUNEL UNIVERSITY
ABSTRACT
Digital Video Broadcasting for Handhelds (DVB-H) is a standard for broadcasting IP Datacast (IPDC) services to mobile handheld terminals.Based on the DVB-T standard, DVB-H adds new features such as time slicing, MPE-FEC, in-depth interleavers, mandatory cell id identifier, optional 4K-modulation mode and the use of 5 MHz bandwidth in addition to the usually used 6, 7, or 8 MHz raster. IPDC over DVB-H is proposed for ETSI to complement the DVB-H standard by combining IPDC and DVB-H in an end-to-end system. Handover in such unidirectional broadcasting networks is a novel issue. In the last few years since the birth of DVB-H technology, great attention has been given to the performance analysis of DVB-H mobile terminals. Handover is one of the main research topics for DVB-H in mobile scenarios. Better reception quality and greater power efficiency are considered to be the main targets of handover research for DVB-H. New algorithms for different handover stages in DVB-H have been the subject of recent research and are currently being studied. Further novel algorithms need to be designed to improve the mobile reception quality. This article provides a comprehensive survey of the handover algorithms in DVB-H. A systematic evaluation and categorization approach is proposed based on the problems the algorithms solve and th...
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