Sponsored by the National Science Foundation 1

WiMAX Campus Deployment Columbia University

Prof. Henning SchulzrinneSungHoon Seo

Jan JanakMarcus Knuepfer

Sponsored by the National Science Foundation 2

WiMAX @ Columbia - Status

27th July 2011

Deployment• On-site installation completed on 23rd

June 2011• Location:

• Mudd Building 16th floor• ASN-GW, IDU and ODU mounted inside

the building• Sector antenna is mounted outside at a

railing• Additionally a PDU (power distribution

unit) is installed to control power remotely

Sponsored by the National Science Foundation 3

Triplite 12U rack (IDU, ASN-GW,

Router and PDU)

ODU mounted inside

the building

Sector antennamounted outside

at a railing

Deployment

WiMAX @ Columbia - Status

Sponsored by the National Science Foundation 4

Conceptual diagram of deployment

Deployment

WiMAX @ Columbia - Status

27th July 2011

Sponsored by the National Science Foundation 5

Deployment

Line of sight

WiMAX @ Columbia - Status

27th July 2011

Sponsored by the National Science Foundation 6

Deployment

Expected coverage

WiMAX @ Columbia - Status

27th July 2011

Mudd building

Sponsored by the National Science Foundation 7

Measurements• Signal quality measurements (RSSI, CINR): create

downlink and uplink coverage map• GPS signal (reflections, signal shadow) problems

not possible to use wimax_gps_oml2 tool as intended

• Defined 125 locations on campus and measured signal parameters at each spot

• Used www.gpsvisualizer.com to create coverage map

WiMAX @ Columbia - Status

27th July 2011

Sponsored by the National Science Foundation 8

Results – Downlink signal strength

RSSI coverage map CINR coverage map

WiMAX @ Columbia - Status

27th July 2011

Sponsored by the National Science Foundation 9

Results – Downlink signal strength• Results of the first measurement surveys:

• Mobile clients work well

• Connection to the Base Station is possible until a downlink RSSI of -75 dBm

• Signal covers nearly the entire campus

• Bad coverage at the edges behind high buildings

• Good performance when in LOS

WiMAX @ Columbia - Status

27th July 2011

Sponsored by the National Science Foundation 10

Measurements – Uplink signal strength• We wanted to know the parameters (RSSI, CINR) of

the received signal of the client at the BS• Parameters are logged at the ASN-GW1

• For our measurement:• Used Windows Laptop with the AWB USB adapter• Used the already defined locations and logged the time

we were at the location• Evaluated the transmission power of the client in

comparison to the uplink RSSI

WiMAX @ Columbia - Status

27th July 2011 1: /var/log/wimax-measurements.dat

Sponsored by the National Science Foundation 11

Results – Uplink coverage map

Uplink RSSI from client at the different

locations

Transmission power of the client

WiMAX @ Columbia - Status

27th July 2011

Uplink CINR

Sponsored by the National Science Foundation 12

Future work• Throughput and delay measurements (iperf)

• Installation of OMF/OML

• Creation of a teaching module for students

• Measurements with other mobile clients (e.g., Nexus S phones)

• Effects of WiMAX services class settings on real-time communication

• Integration with NetServ framework in controller

WiMAX @ Columbia - Status

27th July 2011

Sponsored by the National Science Foundation 13

NEC Base Station

ASN GWRF Agg Mgr

R6

MBS Data

NetServ Container

Module

ChannelCtrl/Info

Module

Service Provider

2. InstallModule

WiMAX Base Station

3. Setup MBZone

Data

TranscodedData

NetServ For WiMAX• Let experimenters run code at BS• Simple and secure (Java OSGI)• Deploy code across hosts deep in

network

• Media Control:• Transcode (channel bandwidth)• Cache (popular content)• Localize (Insert local information)

• Limited Channel Control:• Setup Multicast/Broadcast zones• Adjust parameters in real-time• Configure service flows

• Complements Existing Frameworks:• OMF/OML: Test bed control• Agg Mgr: HW control• NetServ: Data/media control

• NetServ is a GENI related project

27th July 2011