Lecture3 - ECE-547 Introduction to Computer Communication Networks Instructor Xiaojun Lin Lecture 3 Purdue University Ad Hoc Networks Rapidly

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Purdue University ECE ECE - - 547 547 Introduction to Computer Introduction to Computer Communication Networks Communication Networks Instructor: Instructor: Xiaojun Xiaojun Lin Lin Lecture 3 Lecture 3
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Purdue University Rapidly deployable networks that can dynamically adapt to their environment and reconfigure based on the needs of the applications Ad Hoc Networks Ad Hoc Networks
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Purdue University Ad Hoc Networks Ad Hoc Networks • Most current networks require constructing an infrastructure before offering service – Fiber optic lines – Wireless base-stations • Imagine your cell phone can connect to each other directly and form a network – Useful when the infrastructure is not available or destroyed • What are the applications?
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Purdue University Ad Hoc Networks Ad Hoc Networks • Disaster recovery networks – Forest fires, Earthquakes, Floods, Hurricanes – Terrorist attacks • Home networks • Community mesh networks • Vehicular networks • Sensor networks
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Purdue University Ad Hoc Networks Ad Hoc Networks • Challenges: – Self-configurability – Rapid-deployment – Resilience – Network lifetime
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Purdue University Network of Networks Network of Networks • Communication Networks • Social Networks • Information Networks • How to integrate these networks together? • Both Army and National Science Foundation have laid out new CFPs for “Network Science”
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Purdue University Summary Summary ¾ The potential market of these applications is enormous ¾ Expected to attract customers from all walks of life ¾ Generate revenues in the trillions of dollars. ¾ Many problems remain that need to be solved to ¾ Efficiently utilize these networks ¾ Provide high-quality service at the same time ¾ Some of these problems have been the subject of on-going work over many years, and we will study them in class. Conflicting goals
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Purdue University Admission Control Admission Control ¾ In the current Internet, all sessions are allowed to enter the network. ¾ When congested, the transmission rates of these sessions are throttled Î resulting in poor quality service ¾ Future: Networks may need to provide some level of quality of service (QoS) to ongoing applications (especially important for real-time applications such as voice and video). ¾ One approach: Network controller admits a call into the network only if it can guarantee QoS to it and at the same time not violate the QoS that it provides to the other users ¾ Example: A video connection is admitted only if the Pr{packet loss} < 1.0e-09 for each application.
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This note was uploaded on 01/06/2010 for the course ECE 547 taught by Professor Xiaojunlin during the Spring '09 term at Purdue University-West Lafayette.

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Lecture3 - ECE-547 Introduction to Computer Communication Networks Instructor Xiaojun Lin Lecture 3 Purdue University Ad Hoc Networks Rapidly

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