Neighborcast: Enabling communication among nearby clients
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Neighborcast: Enabling communication among nearby clients. Communication among nearby nodes. Neighborcast. AP1. AP2. LAN/Internet. o Two clients are nearby if they hear a common AP o Nearby nodes can be on different frequency channels. C2 hears AP1. 00:0B:80:12:34:56.

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Neighborcast: Enabling communication among nearby clients

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Neighborcast enabling communication among nearby clients

Neighborcast: Enabling communication among nearby clients

Communication among nearby nodes

Neighborcast

AP1

AP2

LAN/Internet

o Two clients are nearby if they hear a common AP

o Nearby nodes can be on different frequency channels

C2 hears AP1

00:0B:80:12:34:56

00:0C:80:12:34:57

00:0A:80:12:34:55

C1

C2

Info

C1 and C2 are neighbors

Multicast group for BSSID 00:0B:80:12:24:56

  • Existing group communication schemes won’t work:

    • o 802.11 broadcast only within WLAN

    • o IP broadcast spans entire subnet. No locality

    • o 802.11 multicast only within WLAN

    • o IP multicast has no locality. Requires neighbor discovery!

o Mapping from AP BSSID to Multicast group address

o Client joins group of every AP around it

o Client sends info on group of associated AP

Applications

Approaches

Using IP Multicast

Improved AP selection

LAN

Map APs BSSID into IP multicast address

228.xx.xx.xx where xx:xx:xx is the last 3 bytes of BSSID

LAN/Internet

00:17:95:81:CA:30

Pros

o No infrastructure support

o Scalable: All traffic is local

Cons

o Limited IP multicast deployment

AP1

AP2

Decides to

switch to AP2

IP Multicast group - 228.129.202.48

RSSI, Load,

Performance

RSSI, Load,

Performance

Using Application Level Multicast

LAN/Internet

Pros

o Works across subnets

o Scalable: Traffic is mostly local

Cons

o Need for rendezvous server

o Message overhead

Multicast group of AP2

Multicast group of AP1

ALM Rendezvous server

Buddies Near Me

00:17:95:81:CA:30

Unicast

o Neighbor discovery

o Estimate “Nearness”

Using RSS Feeds

http://webserver/00179581CA30.xml

Web server

hosting RSS

Pros

o Works over internet

o Easily deployable

Cons

o Less scalable as traffic goes through server

Location Sensitive Ads

00:17:95:81:CA:30

Ranveer Chandra, Jitu Padhye, Lenin Ravindranath


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