MEDIEVAL Work Packages
The work in MEDIEVAL project proposal is planned to last three years and will use an effort of 500 person-months structured in 7 work packages (WPs), 6 technical WPs (WP1-WP6) and one project management WP (WP7). The list of WP is the following:
- WP1: System Design and Global Issues
- WP2: Video Service Control
- WP3: Wireless Access
- WP4: Mobility
- WP5: Transport Optimisations
- WP6: Integration and Experimentation
- WP7: Project Management
The main objective of WP2 is to dynamically coordinate and optimise the video services with proper network support. This in turn shall allow innovative applications in both Uplink and Downlink while not clogging the network with inadequate consumption. Better pricing models can then be structured around Service Level Agreements (SLAs) and overall video usage. This WP shall identify the areas best suitable for dynamic optimisation and develop a set of interfaces to make the video-rich applications communicate with an evolved delivery network. In order to support a new world of video applications, service controllers will be designed. Furthermore, video-rich content will be adjusted maximising the users’ QoE taking into account the network QoS dependencies as well as other potential factors such as monetisation scheme, user differentiation, and other policies. The use of error correction schemes both at application layer and through cross-layer communication mechanisms will also be studied for these video-rich applications, in correlation to various conditions and policies, to get better QoE by improving the reliability content distribution in these inherently unreliable networks.
The objective of WP3 is to design novel mechanisms in the wireless technologies that will optimise the video delivery in the last hop. Its main focus is on WLAN (IEEE 802.11) and LTE-Advanced (3GPP) accesses, completed by the definition of an abstract interface hiding the technology specifics to the higher layers when executing cross-layer optimisations. Even without targeting energy efficiency in itself, the envisioned optimisations on the wireless access will trigger an overall better usage of the energy required to operate the network. With respect to WLAN, this WP will design novel mechanisms to optimise video transmission over IEEE 802.11 technologies, improve characteristics for multicast/broadcast audio video streams and investigate throughput gain by introducing jumbo frames. With respect to LTE-Advanced, WP3 will evolve eMBMS bearer service introducing native multicast from the video server down to the E-UTRAN and mobile terminal and optimising its efficiency. WP3 will investigate the impact of MEDIEVAL video services in LTEAdvanced scenarios, including relays, multi-hop, cooperation, and distributed MIMO and ensuring the right degree of QoE to end users. WP3 will finally contribute to the overall MEDIEVAL strategy by designing mechanisms for packet prioritisation and selection, improving the throughput by introducing jumbo frames and implementing the required level of abstraction towards upper layers.
WP4 aims to cover the different aspects related to mobility. MEDIEVAL addresses Mobile Operators, so the reference mobility architecture, starting point of the study, is the EPS as currently specified by the 3GPP (Release 8). First objective of the project is to evolve EPS towards a truly Flat IP. Different mobility paradigms will be considered including: transport layer mobility and dynamic distributed activation of mobility with displacement of mobility anchors at the edge. Depending on proposed video-services use-cases (e.g.: Internet TV, Personal Broadcasting etc.) different challenging mobility scenarios will be considered including:
- Mobility of sources and receivers.
- Mobility of a single host (host mobility) or of a set of hosts (network mobility).
- Mobility for both one-to-one (unicast) and one-to-many (multicast) communications.
WP6 addresses the design & implementation of the incremental demonstrator as well as the ongoing simulations. As highlighted in the project objectives, MEDIEVAL has as primary goal the setup and the maintenance of an always-on testing platform where selected functionalities can be integrated and verified. This incremental approach will ensure the adequate quality of the produced systems specifications allowing early testing of MEDIEVAL components, thus reducing the risks of a very late integration plan. Further, this WP6 shall test & demonstrate the use cases selected in WP1. The facility used for this effort shall be in EURECOM labs. Participating parties shall include the operators as well as real implemented prototype units from LiveU to transmit live video up from the field for some of the use cases. Testing of large scales shall be done via simulations. It is important to stress that MEDIEVAL consortium management will closely follow the interaction between WP6 and the rest of the work packages.
The main objective of WP7 is the management and coordination of the different activities of the project to ensure that the project runs successfully and achieves its technical objectives in a timely and cost-effective manner. This work package also takes care of the communication and coordination with the European Commission, including timely delivery of management reports, deliverables, and organisation of project reviews.
To sum up, WP1 provides the global view of the system and ensures global consistency. The Wireless Abstract Interface, developed in WP3, defines the relationship between this work package and WP2-4-5 by means of cross-layer interactions. This approach enables a split between the wireless access tasks and more general network paradigms, e.g., resource negotiation/availability and frame priorities. With a similar philosophy, we define the Video service interface between WP2 and WP4-5, in order to exchange, via cross-layer approach, transport and network information, e.g., mobility requirements, broadcast/multicast/P2P selection. WP4 and WP5 interact through the exchange of handover information, whereby it is possible to efficiently select the data for the handover. Finally, WP6 interact with all WPs through an integration effort whose goal is to design, implement and test all the functionalities of each WPs. It should be further noted that, while for efficiency reasons the consortium will interact on per interface basis, the overall discussion involving all partners will be coordinated at WP1 level. Figure 3 shows a graphical representation of the relationship of the technical WPs in MEDIEVAL.