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Computer science USC Wireless Workshop ‘08 Medium Access in new Contexts: Reinventing the Wheel? USC Invited Workshop on Theory & Practice in Wireless.

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Presentation on theme: "Computer science USC Wireless Workshop ‘08 Medium Access in new Contexts: Reinventing the Wheel? USC Invited Workshop on Theory & Practice in Wireless."— Presentation transcript:

1 computer science USC Wireless Workshop ‘08 Medium Access in new Contexts: Reinventing the Wheel? USC Invited Workshop on Theory & Practice in Wireless Networks May 21, 2008 USC Invited Workshop on Theory & Practice in Wireless Networks May 21, 2008

2 computer science USC Wireless Workshop ‘08 “I was originally supposed to become an engineer, but the thought of having to expend my creative energy on things that make practical everyday life even more refined, with a bleak capital gain as the reward, was unbearable to me.” Albert Einstein to Heinrich Zangger, Aug. 11, 1918 “I was originally supposed to become an engineer, but the thought of having to expend my creative energy on things that make practical everyday life even more refined, with a bleak capital gain as the reward, was unbearable to me.” Albert Einstein to Heinrich Zangger, Aug. 11, 1918 “Scientists discover the world that exists; engineers create the world that never was.” Theodore von Karman

3 computer science USC Wireless Workshop ‘08 May 21, Your Panelists John Heidemann, USC/ISI Koushik Kar, Rensselaer Polytechnic Institute Mani Srivastava, UCLA Mingyan Liu, University of Michigan, Ann Arbor Kevin Almeroth, UC-Santa Barbara (moderator)

4 computer science USC Wireless Workshop ‘08 MAC Protocols as the new Blood-Brain Barrier Kevin C. Almeroth UC-Santa Barbara May 21, 2008 Kevin C. Almeroth UC-Santa Barbara May 21, 2008

5 computer science USC Wireless Workshop ‘08 May 21, Outline/Points/Conclusions There are some very interesting network architecture possibilities Greatly expanded ranges of delay/loss/jitter and connectivity/disconnectivity Still a clear delineation between PHY/MAC and NET/TRN/APP Even in the face of cross-layer design Warning: we might be creating a “Networking Winter” Similar to HCI and OS

6 computer science USC Wireless Workshop ‘08 May 21, 20085

7 computer science USC Wireless Workshop ‘08 May 21, The Spectrum of Connectivity Possibilities Continuous Connectivity Autonomous Operation

8 computer science USC Wireless Workshop ‘08 May 21, Infrequent Connectivity The Spectrum of Connectivity Possibilities Continuous Connectivity Intermittent Disconnectivity Autonomous Operation Intermittent Connectivity

9 computer science USC Wireless Workshop ‘08 May 21, Infrequent Connectivity The Spectrum of Connectivity Possibilities Continuous Connectivity Intermittent Disconnectivity Autonomous Operation Intermittent Connectivity End-to-End Availability Topology Variations

10 computer science USC Wireless Workshop ‘08 May 21, Transformational Communication (TSAT)

11 computer science USC Wireless Workshop ‘08 May 21, The Blood-Brain Barrier “A mechanism that controls the passage of substances from the blood into the cerobrospinal fluid and thus into the brain and spinal cord. The blood-brain barrier (BBB) lets essential metabolites, such as oxygen and glucose, pass from the blood to the brain and central nervous system (CNS) but blocks most molecules that are more massive.“ bloodcerobrospinal fluidbrainspinal cordcentral nervous system “The Internet Encyclopedia of Science”

12 computer science USC Wireless Workshop ‘08 May 21, The Blood-Brain Barrier “A mechanism that controls the passage of substances from the blood into the cerobrospinal fluid and thus into the brain and spinal cord. The blood-brain barrier (BBB) lets essential metabolites, such as oxygen and glucose, pass from the blood to the brain and central nervous system (CNS) but blocks most molecules that are more massive.“ bloodcerobrospinal fluidbrainspinal cordcentral nervous system “The Internet Encyclopedia of Science”

13 computer science USC Wireless Workshop ‘08 May 21, The Blood-Brain Barrier “A key aspect of the blood-brain barrier are the thin, flat cells known as endothelial cells which form the walls of capillaries. In most parts of the body, the endothelial cells in the capillaries overlap at what are called junctions. These junctions are leaky enough to let a lot of different materials move through the wall of the blood vessel into the tissue and back again. These materials include normally beneficial stuff such as hormones and nutrient molecules as well as potentially harmful agents like toxins, viruses, and bacteria.”endothelial cells capillaries “The Internet Encyclopedia of Science”

14 computer science USC Wireless Workshop ‘08 May 21, Outline/Points/Conclusions There are some very interesting network architecture possibilities Greatly expanded ranges of delay/loss/jitter and connectivity/disconnectivity Still a clear delineation between PHY/MAC and NET/TRN/APP Even in the face of cross-layer design There are impacts, but is there really a need for cross-layer design? Warning: we might be creating a “Networking Winter” Similar to HCI and OS If all we do is solve the same problems in new contexts or with new (but modestly artificial) resource constraints, we aren’t doing anything new The biggest disconnect is not between theoreticians and practitioners but between researchers and corporations


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