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Wi-Fi Location-Based Services—Design and Deployment Considerations
OL-11612-01
Cisco Location-Based Services Architecture
Complete information on any displayed asset tag can be obtained by clicking on the yellow tag icon
associated with the tag. WCS responds with the information shown in Figure 17, including asset tag
vendor identifier, statistics, and tag properties (including battery status).
Figure 17 WCS RFID Tag—Detailed Information
Note that Figure 17 also includes a hyperlinked listing of location notifications as well as a miniature
location map of the asset tags location. By enabling the Location Debug parameter and enlarging the
map, WCS displays the last detected RSSI levels of each access point detecting the asset tag, as shown
in Figure 18. This RSSI information is collected in a similar fashion to that shown by the show rfid
detail <mac address> command discussed in Minimum Signal Level Thresholds, page 51, and provides
an alternative to the CLI command for determining the detected RSSI of asset tags. As can be seen in
Figure 18, additional information regarding the radio type and age of the last detected signal strength
reading is available by performing a mouse-over of any access point.
- Deployment Considerations 1
- Contents 2
- Executive Summary 3
- Overview 4
- Reference Publications 5
- Hardware/Software 5
- Location Tracking Approaches 6
- Cell of Origin 7
- Time of Arrival 8
- • t = time in microseconds 9
- OL-11612-01 10
- Angle of Arrival (AoA) 14
- • Operation phase 15
- • Calibration phase 15
- Calibration Phase 16
- Operational Phase 17
- RF Fingerprinting 18
- Figure 7 MMSE Estimation 19
- Overall Solution Architecture 20
- Solution Performance 24
- Which Devices Can Be Tracked 25
- Rogue Access Points 35
- Rogue Clients 39
- History Archive Period 42
- History Database Pruning 42
- Absent Data Cleanup Interval 43
- Memory Information 43
- Advanced Commands 43
- Enable Calculation Time 45
- Enable OW Location 45
- RSSI Discard Times 45
- RSSI Cutoff 46
- Queue Limit 46
- Retry Limit 46
- Refresh Time 46
- Deployment Best Practices 51
- Deployment Best Practices 52
- Antenna Considerations 69
- Antenna Orientation 70
- Site Calibration 71
- Calibration Validity 73
- Number of Samples 74
- Inspecting Location Quality 76
- Location Tracking Challenges 79
- Small Sites 80
- Antenna Installation Height 80
- Traffic Considerations 81
- RFID Tag Considerations 85
- Passive RFID Tags 86
- Figure 57 Passive RFID Tags 87
- Semi-Passive RFID Tags 89
- Active RFID Tags 90
- Beaconing Active RFID Tags 91
- Transponder Active RFID Tags 91
- 802.11 Active RFID Tags 92
- Compatible RFID Tags 93
- 330 630 660 Seconds 97
- Configuring Asset Tags 98
- AeroScout Asset Tags (Type 2) 99
- RFID Tag Considerations 100
- PanGo Locator LAN Asset Tags 102
- Figure 77 PanGo Locator 105
- Locations 108
- Signaling 117
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