Site Surveys For Location Applications - Wireless-nets
Site Surveys for Location Applications Jim Geier Principal Consultant Wireless-Nets, Ltd. Web: www.wireless-nets.com Email: jimgeier@wireless-nets.com
Presenter Jim Geier – Principal Consultant, Wireless-Nets, Ltd. – Assists firms with the development and deployment of wireless networks – Has conducted wireless site surveys for design and verification purposes in many venues, such as hospitals, airports, warehouses, and cities – Author of a dozen books, including Designing and Deploying 802.11n Wireless Networks (Cisco Press) and Implementing 802.1X Security Solutions (Wiley) – Instructor: Wireless Network Design Workshop (sponsored by Fluke Networks) – learn how to design optimum 802.11n/ac networks with AirMagnet Survey for voice and location applications - details at www.wireless-nets.com/workshop.pdf – Contact Jim Geier at jimgeier@wireless-nets.com Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Page 2
Overview Survey Fundamentals Technical Requirements Test Methods Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Page 3
Survey Fundamentals Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Page 4
What is a Design-Based Survey? Performed before installation of access points Needed to optimize installation locations for access points Critical to achieve required performance and security Must satisfy special application needs and requirements – Data – Voice – RTLS AirMagnet Survey Heat Map AP10 AP9 AP4 AP7 AP3 AP2 AP6 AP5 AP8 AP1 Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Page 5
General Considerations Wireless requirements – – – – Application type (e.g., voice, RTLS) Client devices Signal coverage areas Roaming Range boundary criteria – RSSI, SNR, and data rate cutoffs Test tools – Signal coverage and spectrum analysis Survey planning and coordination – Access to rooms – Schedule Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Page 6
Technical Requirements Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Page 7
Range Boundary Criteria Access Point Signal above range boundary cutoff Range Boundary Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Typical voice criteria (all must be met) – – – – RSSI: -67 dBm SNR: 25 dB Data rate: 24 Mbps PER: 1% max Signals below range boundary cutoff Page 8
Roaming Considerations Critical for voice applications Need overlapping cells to support effective handoffs for roaming – from both access point and client perspective Strive for 20 percent overlap between adjacent radio cells AP2 AP1 20% Overlap Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Page 9
RTLS Technical Requirements Need access points in corners, around the perimeter, and fillers Triangulation is needed for location algorithms to work Minimum -75 dBm from at least three (3) access points in different quadrants Generally requires significantly more access points than voice-only designs AP2 AP1 Quad 1 Quad 2 User 1 Quad 3 Quad 4 AP3 AP4 AP5 AP6 Quad 1 Quad 2 User 2 AP7 Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Quad 3 Quad 4 AP8 Page 10
Test Methods Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Page 11
Test Access Point Test Configuration Use similar access point and antennas as being deployed Transmit power – Set to transmit power of weakest client (11 dBm?) RF channel – Use 5 GHz only? Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Page 12
Calibrate for Target Client Devices Perform survey based on target client device(s) RSSI RSSI varies among different client device radios Calibrate AirMagnet Survey to display same RSSI as target device(s) -70dBm Target Device AirMagnet Survey -80dBm Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Test Access Point Page 13
AirMagnet Survey Configuration Use active survey mode Use typical client radio Propagation assessment: 10 feet Client radio transmit power: typical weakest client Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Page 14
General Test Procedures 1. 2. 3. 4. 5. Perform initial walkthrough of the coverage areas Perform RF spectrum testing Configure test equipment based on requirements Perform initial sample signal propagation testing Test coverage of desired access point installation locations – – – Compare 2.4 GHz and 5 GHz propagation Test inter-floor propagation Test all proposed installation locations Click sample points within 10-15 feet Take readings until RSSI is below -80 dBm 6. Prepare site survey report ***Establish survey guidelines for consistency Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Page 15
Access Point Location Tips For location-based surveys, place access points in all corners of the facility and along perimeters Locate access points next to elevators – Test inside the elevator – Higher gain antenna? Locate access point near stairwells (inside stairwells?) Stagger access points on adjacent floors if possible – Sample test inter-floor propagation on each floor Level 4 AP2 AP1 AP14 Level 3 Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Page 16
Example – Survey the Corners Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Page 17
Example – Survey the Perimeter -75 dBm Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright -75 dBm Page 18
Example – Verify Location Requirements In AirWise, choose Cisco Location Service policy Or, edit policy as needed: – Number access points – Minimum RSSI Display coverage based on policy Verify whether location requirements are met Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Page 19
Example – Add Fillers Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Page 20
Example – Re-verify Location Requirements In AirWise, verify whether location requirements are met Move access points as needed Continue testing Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Page 21
Example – Verify Overall Coverage Ensure overall signal criteria are met Move access points as needed Continue testing Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Page 22
That’s it Questions? Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Page 23
More Information Discussions – www.airwisecommunity.com AirMagnet Product Information – http://airmagnet.flukenetworks.com/ – info@airmagnet.com Wireless Network Design Workshop – Hands-on workshop steps you through designing optimum 802.11n/ac wireless networks for voice and location applications using AirMagnet Survey – For details, visit http://www.wireless-nets.com Copyright2011 2013– –Wireless-Nets, Wireless-Nets,Ltd. Ltd. Copyright Page 24
-Has conducted wireless site surveys for design and verification purposes in many venues, such as hospitals, airports, warehouses, and cities -Author of a dozen books, including Designing and Deploying . networks with AirMagnet Survey for voice and location applications
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