Best Practices for In-Building & Spot Coverage Solutions

Transcription

1 Best Practices for In-Building & Spot Coverage Solutions Kenneth Monro Dekolink Americas, Inc June 13, 2006 NPSTC Meeting

2 Objective of presentation 1. To share information about market activity relative to in-building wireless solutions 2. To review best practices employed when considering in-building systems 3. To understand hardware options in the process of selecting the right tool for the right job 4. To review technology which enables quality deployments

3 Coverage Solutions

4 Trends in In-building In-building deployments have dramatically grown in number and continue to do so Some governmental agencies are mandating coverage in certain public buildings Rogue (un-coordinated/un-approved) deployments are cause for great concern to all mobile network operators Public safety officials are feeling the need to address carrier network coverage from public safety perspective

5 In-Building Best Practices Site Survey/Audit Spectrum analysis and coordination System Design and Engineering Installation and Implementation Record and Catalogue site specifics

6 Site Survey/Audit In-building DAS Number of users in building Number of users of foreign networks Density of walls, ceilings Proximity of windows relative to BTS Existing signal strength in building Building Size Complexity of in building environment

7 Examples of in-building systems Small Buildings

8 Examples of in-building systems Large Buildings

9 Examples of in-building systems Simple Solutions

10 Examples of in-building systems Complex Solutions

11 Spectrum Analysis and Coordination Whose signals are in spectrum of proposed amplifier system How will it effect their system RFC coordinators provide list of LMR operators FCC can provide list of licensees of other spectrum Prior notice of proposed system is the right thing to do! Today s public safety systems with carriers spectrum under consideration as well as LMR!

12 Donor Link-- No Interference If other SMR BTS are outside donor antenna beam, use band selective Class B OK as long as coverage provided is noninterfering Repeater Coverage Area Repeater Repeater Donor Antenna Beamwidth Nextel Public Safety Radio Donor Base Station Private SMR Network Base Station

13 Band selective solutions Systems should be field re-bandable Systems should have oscillation prevention technology PHASE 1 NON-NEXTEL SOME NEXTEL NEXTEL B / ILT VOLUNTEERS 900 PHASE NEXTEL PUBLIC SAFETY 900 NEXTEL PHASE PUBLIC SAFETY NEXTEL

14 Small Site Coverage To/From Cell Site Yagi Antenna Indoor Coverage Antenna Mini-Repeater

15 Larger Buildings Repeater drives distributed antenna system (DAS) in larger areas DAS distributes even coverage To/From Cell Site Repeater Off Air Directional Antenna (Yagi) Floor 6 Floor 5 Floor 4 Quality systems can self optimize gain and level 5/8" or 7/8" coax RF Tap + 2 Way Splitter Floor 3 Floor 2 Antenna Floor 1

16 Donor Link-- Interference If the BTS for other SMR services are within the donor antenna beam width, the uplink may cause interference Channel Selective Repeaters eliminate interference problems Repeater Coverage Area Repeater Repeater Donor Antenna Beamwidth Nextel Public Safety Radio Donor Base Station Private SMR Network Base Station

17 Channel Selective Solutions Channel Selective technology can be used in spectrum challenged environments BEFORE NOISE AND INTERFERENCE DSP (Digital Signal Processing) Filter Bank FILTER FILTER FILTER FILTER FILTER FILTER AFTER ISOLATED SIGNAL INTERFERENCE MITIGATED

18 Channel Selective Devices FCC High Power Outdoor Coverage Repeaters Must be Class A Should be able to be RE-BANDED Should have Oscillation prevention technology High Power (50W) is desirable to meet most coverage requirements Must select only those channels that are licensed to you! Should be capable of remote configuration/re-configuration and alarming as a network element Should use digital filter technology Digital Channel Selective Repeater

19 Advantages of Digital Signal Processing Filter Sharpness Extremely tight skirts for out of band rejection Flexibility and Programmability No of channels Channel locations Channel width Delay and moderation of delay Interference rejection

20 Filter Sharpness Digital technology creates significantly sharper filters compared to advanced SAW IF filtering Digital Filter SAW Filter 10 db / khz > 50 khz > 40 db

21 Yellow Springs, OH Political Rally held in remote area Poor coverage due to ravine and surrounding hills Temporary coverage requirement Solved with Channel Selective repeater Additional users included State, County and FBI officials for mission critical communications

22 Tunnel Coverage Should be treated as outdoor solution Very do-able with Channel Selectivity Leaky coax or DAS

23 Installation and Implementation Antenna Spacing Proper Isolation Proper gain/level Ingress/Egress Cable types Power systems Lightening Protection Coax/Fiber

24 System Design and Engineering Hardware Selection Process Repeaters/BDAs Inherent Characteristics: Power Gain Noise levels Important Features: High Q filters and Frequency Selectivity Level/Gain control Oscillation monitoring/elimination Software controlled Tuning, Alarming, management

25 System Design and Engineering Hardware Selection-- Ancillaries Donor antennas with high directionality Cable and Connectors with low loss/noise Lightening arrestors at ingress/egress

26 System Design and Engineering Donor site path What is signal crossing on it s way to BTS What is signal reaching past BTS Is the signal too strong for application? Do I need channel selectivity? How is the network effected by deployment?

27 Installation and Implementation Case Study: Tier 1 PCS operator, NYC Carrier s customer improperly self installed system Donor antenna and coverage antenna too close resulting in not enough isolation System Oscillated causing spurious emissions One single RF carrier affected 200 base stations interrupted 250,000 calls dropped Subset of calls were 911

28 Impacted Cell Sites Green Stars = Cells with CRSSIRCTI > 5000 Blue dots = Existing Cell Sites

29 Record and Catalog site specifics Tracking of assets Product type, power, gain, noise level Sharing of data possible Dekolink is assembling a Process for spectrum owners and users of equipment to identify locations even when not licensed! Reduces possibility of interference and reduces time to mitigate interference

30 Thank you! Kenneth Monro Dekolink Americas, Inc