1 / 4

Capture Effect

Capture Sensing Simultaneous Access Exploiting the Capture Effect for Greater Spatial Reuse and Higher Bandwidth. What happens when 2 packets collide? What information can we collect during a collision? How good (bad) is CSMA?. PACKET A. PACKET A. PREAMBLE. PREAMBLE. PREAMBLE. PREAMBLE.

azuka
Download Presentation

Capture Effect

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Capture Sensing Simultaneous AccessExploiting the Capture Effect for Greater Spatial Reuse and Higher Bandwidth

  2. What happens when 2 packets collide? What information can we collect during a collision? How good (bad) is CSMA? PACKET A PACKET A PREAMBLE PREAMBLE PREAMBLE PREAMBLE PAYLOAD PAYLOAD PAYLOAD PAYLOAD PACKET B PACKET B A B Capture Effect CSMA At R1: Nothing! At R2: A R1 T1 R1 T2 C R2

  3. Build a table of stronger-weaker neighbors Propagate tables? Packet format Eliminating hidden-terminal ? A C Capture Sensing Simultaneous Access • According to my table: • T2 < T1 -> OK to send • T3 > T1 -> NOT OK to send R1 T1 T2 T3 R2

  4. Design space in spatial reuse (spectrum) CSMA vs CSSA vs No Carrier Sensing at all Protocol design Apriori vs adaptive 2nd tier tables TTS (CSMA-EX) RTS/CTS Bandwidth gain / (loss) under: Point-point Broadcast Low-power listening Network layer choice Simulation (matlab) Future Plans (winter break and spring semester) Choose best one Implementation Deployment Assessment Dissemination Status and Plan Questions or suggestions?

More Related