Terminal-Network Interaction

1
Context Aware Communication, Terminal and User
Work Package Terminal-Network Interaction
TermiNet Team, CACTUS

• 1. Context
• An ad hoc network consisting of intelligent nodes
  (coined i-DEAs)
• No central authority.
• Information exchange between nodes, or between
  nodes and servers in wired networks.
• Multi-hop communications.
• Cooperation in a peer-to-peer (P2P) fashion.

• 4. Resource Management QoS
• Impact of configuration, connectivity, and
  network size on capacity, supported applications,
  and QoS.
• Strategies for fair, efficient and cooperative
  sharing among i-DEA devices of scarce resources,
  such as battery power, bandwidth and packet
  queuing capacity.
• Appropriate service differentiation.
• We develop an end-to-end quality model based on
• Amounts of resources available.
• QoS requirements of traffic.
• Willingness to cooperate which depends on the
  power level, available bandwidth, number of own
  and foreign flows.

• 2. Challenges
• Connectivity and routing based on context
  awareness properties, e.g., predicted state,
  location, and link quality.
• Resource management, striving for a good balance
  between individual and overall Quality of Service
  (QoS).
• Scalable (multimedia) content access based on
  required quality, i-DEA devices potentials,
  application needs, network, processing, and power
  constraints.

• 5. Scalable Multimedia Access
• Real-time low-latency delivery of multimedia
• We use ad-hoc networks with high connectivity
  and a high number of nodes.
• The network has multiple paths from A to B.
  Hence there is redundancy to be exploited.
• Using Multiple Description Coding (MDC) we split
  the multimedia stream in two or more parts. Each
  part is transmitted over a different path.
• Advantages Low latency, robust to packet
  losses, robust to lost links.
• The main research questions in MDC
• How to split up the data in a clever way
• How to maximize the quality
• How to distribute the data through the network
  (routing)

• 3. Topology, Connectivity, Connection
• Network-topology evolution is the dominant
  factor for performance of communications and
  services in ad hoc networks.
• The topology dynamics are highly dependent on
• - radio characteristics (power, frequency, etc.)
• - node mobility
• - environment (e.g. obstructions).
• We study their relationships for a specific
  scenario a group of pedestrians (tourists) in an
  urban environment.
• Objectives
• - better predict/anticipate topology changes
• - adjust services to a highly dynamic context
• - improve simulation models.

Info H.J. Sips, lth.j.sips_at_ewi.tudelft.nlgt http//
www.cactus.tudelft.nl