## Abstract

A key challenge in wireless networking is the management of interference between transmissions. Identifying which transmitters interfere with each other is crucial. Complicating this task is the fact that the topology of wireless networks can change from time to time, and so the identification process may need to be carried out on a regular basis. Injecting active probing traffic to assess interference can lead to unacceptable overhead, and so this paper focuses on interference estimation based on passive traffic monitoring in networks that use the CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) protocol. A graph is used to represent the interference in the network, where the nodes represent transmitters and edges represent interference between pairs of transmitters. We investigate the problem of learning the graph structure based on passive observations of network traffic transmission patterns and information about successes or failures in transmissions. Previous work has focused on algorithms and validations in small testbed networks. This paper focuses on the scaling behavior of such methods which is unaddressed in prior work. In particular we establish bounds on the minimum observation period required to identify the interference graph reliably. The main results are expressed in terms of the total number of nodes n and the maximum number of interfering transmitters per node (i.e., maximum node degree) d. The effects of hidden terminal interference (i.e., interference not detectable via carrier sensing) on the observation time requirement are also quantified. We show that it is necessary and sufficient that the observation period grows like d ^{2} log n, and we propose a practical algorithm that reliably identifies the graph from this length of observation. We conclude that the observation requirements scale quite mildly with network size, and that the networks with sparse interference patterns can be more rapidly identified than those with dense interference patterns.

Original language | English (US) |
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Title of host publication | 2012 IEEE International Symposium on Information Theory Proceedings, ISIT 2012 |

Pages | 2736-2740 |

Number of pages | 5 |

DOIs | |

State | Published - Oct 22 2012 |

Event | 2012 IEEE International Symposium on Information Theory, ISIT 2012 - Cambridge, MA, United States Duration: Jul 1 2012 → Jul 6 2012 |

### Publication series

Name | IEEE International Symposium on Information Theory - Proceedings |
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### Other

Other | 2012 IEEE International Symposium on Information Theory, ISIT 2012 |
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Country | United States |

City | Cambridge, MA |

Period | 7/1/12 → 7/6/12 |

## All Science Journal Classification (ASJC) codes

- Theoretical Computer Science
- Information Systems
- Modeling and Simulation
- Applied Mathematics