As the information needs and services of today's Armed Forces grow in size and complexity, providing the necessary transport networks to support broadband services becomes a significant challenge. This is especially true in tactical environments where Warfighters often rely on low data-rate tactical networks or bandwidthconstrained terrestrial circuits for last-mile data dissemination. Furthermore, these networks typically cannot support the transport requirements of mobile or dismounted Warfighters, a capability which is essential to the nature of their operations. Providing high bandwidth information such as real-time video or high-resolution images and maps to mobile forces would significantly increase Situational Awareness (SA) and provide broadband digital services to the tactical environment. This last-mile broadband capability could significantly streamline the decision-making cycle horizontally and vertically for a more lethal, agile and effective combat force.DVB-H, a newly released European standard defined to broadcast digital television to mobile handheld devices, is one potential technology that could provide the necessary bandwidth, range, and mobility requirements to transmit information in a wireless, last-mile tactical environment.The projected widespread acceptance of DVB-H technology in Europe, Australia, and throughout the world is expected to create a strong market of interoperable, standards-based products in the near future. Implementing a standards-based Commercial-of-the-Shelf (COTS) solution will better prepare the DoD in adopting technology advancements in a more timely and cost effective manner. This paper introduces the capabilities and benefits of DVB-H technology and examines how DVB-H can extend current information sources and services to dismounted, mobile Warfighters. Specifically, this paper also addresses the design, capabilities, and benefits of a last-mile extension of the Global Broadcast Service (GBS) with a DVB-H network. Standards Institute (ETSI) finalized and released the DVB-H standard. DVB-H builds upon the Digital Video Broadcast-Terrestrial (DVB-T) standard which specified the terrestrial transmission of MPEG-2 based television services. Although DVB-T was designed to support fixed receivers, experimental results and deployments illustrated the technology's ability to also support mobile environments. However, the DVB-T technology, which targets fixed, electrically-powered receivers, does not support battery-limited hand-held devices. The DVB-H standard was developed to address this power limitation and improve reception in mobile environments.To provide a one-way, robust broadcast in a variety of operational conditions, DVB-T and DVB-H employ Coded Orthogonal Frequency Division Multiplexing (C-OFDM). This multiplexing technology involves splitting a wide channel bandwidth into numerous narrow-band channels, called sub-carriers. Transmitting on multiple carriers increases the system's robustness against dynamic and static multi-path effects which occur when multiple...
As the Defense Information Systems Network (DISN) transitions to a native-IP network supporting converged unclassified and secret data, voice, and video on the Global Information Grid (GIG) backbone, an extensive Quality of Service (QoS) architecture will be required to effectively support real-time and mission critical traffic. Service Level Agreements (SLAs), which define the negotiated and contracted service between the Defense Information Systems Agency (DISA) and it's customers (DoD Services and Agencies), will rely on QoS policy implementations to ensure contracted service levels can be satisfied. Effectively managing SLAs can be challenging in fixed, wireline environments given the dynamic nature ofpacket-based traffic and varying mission priorities and requirements of the DoD. Extending these services into wireless tactical environments with mobile users and varying wireless link conditions and network topologies introduces additional complexity.With the emergence of standards-based Commercial-offthe-Shelf (COTS) technologies including 802.16, 802.20, and other OFDM-based technologies, broadband wireless networks may soon provide a last-mile tactical extension of the DISNIGIG. Supporting real-time and mission critical services across these wireless networks involves traditional IP QoS mechanisms as well as additional link layer QoS mechanisms to dynamically and intelligently allocate RF spectrum among multiple users. To provide a more seamless extension of the DISNIGIG, these wireless networks must be capable of maintaining QoS and SLAs that adhere to the GIG's End-to-End QoS policy. This paper addresses the following topics. the deployment of a GIG End-to-End QoS policy that meets the needs of the disadvantaged tactical warfighter; the challenge of deploying and managing a consistent End-to-End QoS policy when using network hardware with difering QoS capabilities, and the evaluation of QoS and SLAs Management, and Policy-Based QoS.
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