48x48%20Poster%20Template

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Interference-Mitigating mobility strategies in
MANETs Rohit Naini, Pierre MoulinUniversity of
Illinois, Urbana-Champaign
Introduction
A single relay based system
System with Multiple Relays

• Current Research Focus on MANETs mainly
  involves
• Network Detection
• Routing Protocols
• Power Management
• Node Interlinking and cooperation
• Mobility of the nodes in the system is viewed as
  a passive element in the overall operation
  scheme.
• We observe that nodes with knowledge of the
  network topology and active mobility could move
  optimally and potentially improve the capacity
  region of the network.

• If we implement a multiple relay single hop
  switching system, the receiver node can switch to
  a relay not marred by the interferers signal
• The decision regions for a system with 4
  symmetric relays and an interferer are shown below

• The network configuration and link strengths are
  as shown below.
• Since the capacity of a non-degraded relay
  channel is unknown, cut-set bound on network
  capacity is employed as the cost function.
• A two-person zero sum game with C as the cost
  function and a greedy strategy to make a decision
  on the direction of mobility for the receiver and
  interferer. The resulting simulation is as shown
  below.

Interferer
Source
Relays
Motivation A simple source- receiver- interferer
Some Insights into Relay Operation

• This is the simplest system that shows the
  capacity gain that could be achieved due to
  mobility.
• The plot below shows a metric of link capacity
  between source and receiver as a function of the
  receivers location in the presence of a Gaussian
  Interferer.
• The peak appears at the source position and the
  trough at the interferer, clearly indicating that
  the receiver should balance between moving
  towards source and away from the interferer.

• A careful look at t1 term in the analysis of the
  single relay system shows two separate elements
• The source-relay cooperation element
• The receiver-relay cooperation w.r.t.
  interferers signal
• In fact, certain simulations revealed an
  inhibition from the malicious interferer to get
  too close to the active relay

where ? 0,1 is the cooperation coefficient
between source and relay
Source Location
Future Directions

• Allowing for multi-hop relaying can
  significantly increase the complexity as well as
  improve opportunity for interference mitigation
• Relay mobility could be introduced to provide
  more degrees of freedom to the system
• A multi-objective cost function involving other
  aspects such as a motive to translate between
  locations

Interferer Location