beamcast

beamcast - 1 Link Layer Multicasting with Smart Antennas:...

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Unformatted text preview: 1 Link Layer Multicasting with Smart Antennas: No Client Left Behind Souvik Sen, Jie Xiong, Rahul Ghosh , Romit Roy Choudhury 2 Widely used service Interactive classrooms, Smart home, Airports MobiTV, Vcast, MediaFlo Single transmission to reach all clients Wireless Multicast Use-Cases 3 Today: Multicast rate dictated by rate of weakest client (1 Mbps) Inefficient channel utilization Goal: Improve multicast throughput Uphold same reliability Motivation 1 Mbps 11 Mbps 5.5 Mbps 4 1. Scattered clients, different channel conditions 2. Time-varying wireless channel 3. Absence of per-packet feedback Problem is Non-Trivial 1 Mbps 11 Mbps 5.5 Mbps 5 Solution also Non-Trivial 1 Mbps 11 Mbps Low rate transmission leads to lower throughput High rate transmission leads lower fairness Past research mostly assume omnidirectional antennas 6 Problem Validation through Measurements 7 Measurements in Duke Campus AP Clients 8 Measurements in Duke Campus AP Clients Transmission @ 1 Mbps AP Clients 9 Measurements in Duke Campus Transmission @ 2 Mbps AP Clients 10 Measurements in Duke Campus Transmission @ 5.5 Mbps AP Clients 11 AP Clients Measurements in Duke Campus Transmission @ 11 Mbps 12 Measurements in Duke Campus Client index Delivery Ratio Topologies are characterized by very few weak clients 13 Reality Weak clients tend to be clustered over small regions shadow regions 14 Intuition 1 2 3 4 5 6 15 Intuition 1 2 3 4 5 6 1 Mbps Omni 16 Intuition 1 2 3 4 5 6 11 Mbps Omni 17 Intuition 1 2 3 4 5 6 4 Mbps Directional 11 Mbps Omni 18 Intuition 1 2 3 4 5 6 1 Mbps Omni 1 2 3 4 5 6 4 Mbps Directional 11 Mbps Omni 19 Intuition to Reality Few directional transmissions to cover few clients 20...
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beamcast - 1 Link Layer Multicasting with Smart Antennas:...

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