Part 3 IBS Survey y and Design g
Professional P f i lT Total t l Solution S l ti for Wireless Network Optimization
Table of Contents
Survey Design Optimization Documents
Survey Target Preparation Building Survey KPI Status Test KPI Status Test Space Loss Test
SURVEY
Target • Check building capability, scale, floor plan, g q p ceiling , well for electronic, equipment room, to design donor equipment ,antenna location, cable route equipment space etc cable route, equipment space etc .
Target – Investigate indoor/out door signal coverage status and handover data, to deicide coverage range and coverage quality and IBS system solution
Target – Test and verify wall and obstruction material penetration performance to decide antenna location ,output power and coverage radius.
Preparation • Authorization letter from operator • Get site network inform from operator Get site network inform from operator – Network parameter surround building – Site transmit type Si i – Donor source type – Coverage area and coverage KPI
Preparation • Get building floor plan from building owner – Building floor number and height g g – Building structure and scale each floor – Building functional block and floor Building functional block and floor – Elevator quantity and run range
Preparation • Test Equipment
Preparation • Test Equipment and accessories
tape measure
Compass
Safety shoe, cap, belt
GPS
Power meter Signal source
Antenna &jumper camera
Building Survey – Site Name and photo – Site Location: GPS data, address, surround environment and photo – Building height, total floor ,total area square Building height, total floor ,total area square meter and 360degree photo in building rooftop – Building inner description and photos Building inner description and photos – Building function block description, including main build basement etc build, basement etc – Coverage area square mete and floors
Building Survey – Building passage, stairs location – Elevator location, elevator share well, operation floor, usage – Well for electronic position, quantity Well for electronic position, quantity – Room decoration and materials, ceiling structure – Powering system Po ering s stem – Grounding system
Building Survey • Equipment installation room, grounding, p powering and install condition g GSM Repeater
Input
Electronic Meter Power Switch
WCDMA Repeater
Channel Battery
Battery Combiner
Output
JLY
Grounding
Building Survey – Donor antenna installation location, installation condition and cable route to indoor – Lightening protection
Building Survey – Service antenna installation location & installation condition Omni Antenna installation (Ceiling )
Antenna inside elevator
KPI Status Test • OMC Data Collect – Donor BTS :BSIC , CID, CGI, BCCH, TCH, Hopping , , , , , pp g – Neighbor Cell Parameter – Handover Limit Parameter Handover Limit Parameter – Power Control Parameter – Traffic status
KPI Status Test • Walk Test – Test for different floor structure, choose one floor , at every 3 same structure floor – Elevator , including entry and exit elevator Elevator including entry and exit elevator – Toiler, Underground, Passage – For open space, test route along space edge and l d d cross line in center – Indoor /outdoor handover test
Space Loss Test • Test Requirements – Same floor test, up and down floor penetration , p p test, elevator penetration test – Floors with same material and structure, only test Floors with same material and structure only test one floor – Check antenna coverage radius, to reduce overlap Check antenna coverage radius to reduce overlap area – Signal leakage test, 10m far from door Si l l k 10 f f d – Antenna output power set to design power
Space Loss Test • Test Result
IBS Design IBS Design General Principles KPI R KPI Requirement i Signal Source Selection Antenna Position DAS Design g Topology Amplifier
IBS DESIGN IBS DESIGN
IBS Design
IBS Design
1
2
3
4
5
6
7
Principles
KPI
Signal Source
Antenna Location
DAS
Topology
Optimization
General principles • Meet coverage quality and user capacity li d i requirement • Balance indoor and outdoor network p ; development; • Easy to reconfigure BTS or add new and adjust IBS system structure to follow user adjust IBS system structure to follow user expand • WLAN should be take into IBS system for WLAN h ld b t k i t IBS t f future usage
General principles • IBS signal should be smooth in coverage area, i l h ld b hi and be least signal leakage to avoid handover with outdoor network • IBS structure should be simply and easy to py y install, not effect to original structure and decorate • IBS topology should be easy to overlay and combiner for future maintenance and combiner for future maintenance and adjustment
General principles • Business type & sensitivities 2G Business
3GBusiness
12.2K Voice
64K Data
384K Data
Business Type
Main Business
Low Speed Business
Sensitivities
-110
-105
Business Type yp
Basic Business
Video Business
High g Speed p Data
Sensitivities
-125
-120
-112
• Business plan share Business plan share Business type
share
Remark
voice
80%
AMR
Video
15%
AV
Dat
5%
PS
KPI Requirement •Antenna output Power
3dB difference between antennas 15dm maximum output power MCL>65dBm
Access success rate
99% success access network in 90% coverage area
Quality
BLER<=1% for 12.2kbps call business BLER<=0.1% for 64kbps CS business BLER<=10% for PS business
CPICH power（downlink power（downlink load=75%, uplink load=50%
≥ 85dBm,Ec/Io≥ 10dB for medium and high speed ≥‐85dBm,Ec/Io≥‐10dB for medium and high speed data business ≥‐90dBm,Ec/Io≥‐10dB for low speed data business , ≥‐95dBm,Ec/Io≥‐12dB for call business Indoor signal 6~10dBhigher than outdoor in co‐ frequency condition
Signal Source Selection • Capacity
Signal Source Selection • Capacity
Signal Source Selection • Capacity – Traffic < 18Erl : Repeater p – Traffic < 58Erlang : BTS or BBU+RRU – Traffic >58Erlang : BTS Hotel +FOR repeater Traffic >58Erlang : BTS Hotel +FOR repeater – Traffic= Total Person * erl/hour * market share% » = 1000 *0.02 *30% » =6Erl
Signal Source Selection • BTS Output Power Balance – Output power Balance p p – BTS output power 43dBm，pilot output power:33dBm power:33dBm – 5W Micro BTS, pilot output power:27Bm – 2W Micro BTS, pilot output power:23Bm i il – RRU output power 42dBm, pilot output power:33dBm
Relative cell size 100% 128 kbps
80% 60%
144 kbps p 144 kbps 64 kbps
8 kb kbps 64 kbps
64 kbps
40%
144 kbps p 64 kbps 64 kbps
Low Traffic 200 kbps ⇒ Larger coverage
High traffic 800 kbps ⇒ Small coverage
20% 0% 0
0.1
0.2
0.3
0.4
Traffic load factor
0.5
0.6
0.7
Signal Source Selection • RF Repeater – Stable receive level >‐65dBm – Ec/Io>‐7dB – Neighbor Ec/Io< Pilot Ec/Io +7dB Neighbor Ec/Io< Pilot Ec/Io +7dB – Donor Antenna Installation Height<25m – Donor Antenna require narrow beam width and high front‐to‐back ratio – Output power balance: 7dB
Signal Source Selection – Donor Signal Strength vs. Angle
Signal Source Selection – Donor Signal Strength vs. Time
Antenna Location – Coverage requirement: power & radius – MLC Requirement :minimum coupling loss – EMC Requirement – Antenna Type Antenna Type – Isolation requirement – Handover or leakage requirement – Application Case :Lobby, floor, elevator, ground, spot area
Antenna Location – System MLC Requirement • Coupling Loss >70dB ( >67dB@indoor) @UE minimum transmit power>‐50dBm; • Space Loss L2=38dBm @2000M , distance=1m; • Cable Loss L1 >29dBm • Antenna output power<33‐29=4dBm
20
18
16
Ptx, min = -50dBm 14
nr (d dB)
12
10
8
6
4
2
0 35
40
45
50
55
60
65
path loss of the interfering mobile (dB)
70
75
80
Antenna Location • Building material block
Antenna Location – LS =10Lg (4πdf/c)2 – =20Lg(4π/c)+ 20Lgd(m)+20Lgf(MHz) – =‐27.56+20Lgd(m)+20Lgf(MHz) – =38.46+20lgd(m) (@2000M) =38 46+20lgd(m) (@2000M) Distance
1m
5m
10m
12m
14m
15m
20m
25m
30m
Loss
38.46
52.44
58.46
60.04
61.38
61.98
64.48
66.42
68.00
Antenna Location • Example
DAS Design • System Structure – Splitter p – Coupler
DAS Design • System Structure
DAS Design • Topology(Business Block )
DAS Design • Amplifier application
Poor Coverage Poor Coverage Signal leakage Signal Source Selection Antenna Position Antenna Position DAS Design
OPTIMIZATION
Poor Coverage • Problem description：antenna locate outside of office, cannot cover elevator lobby well. y – Antenna output power is low – Wall block signal transmits Wall block signal transmits
• Solution ：Add antenna in lobby or increase antenna power
Signal Leakage • Problem description: Signal leakage – Mobile in outside vehicle call drop by onsite test, p y , because mobile handover cannot on time – It reduces indoor capacity by absorbing outdoor It reduces indoor capacity by absorbing outdoor Before Optimization user Omni Antenna
Signal Leakage • Solution – Reduce antenna output power(adjust cable route p p ( j power or insert attenuator before antenna ) – Replace Omni antenna with directional antenna Replace Omni antenna with directional antenna – Follow multi‐antenna‐ low output‐power design rule
After Optimization
Handover • Indoor /Outdoor Handover Key points: – Reselection @Idle mode @ – Handover @call mode Elevator and El t d floor
Where happen handover Windows Parking entry and exit and exit
Lobby an outdoor
Handover • Elevator handover – Using same cell as signal source at all elevators g g – Using panel antenna in different floors Elevator well
Cell 2
f3
O td Outdoor C ll Cell
f1
Elevato r
f1 Cell 1
Handover • To extend coverage handover area in every floor lobby
ELEAVTOR
LOBBY
ELEAVTOR
HANDOVER LOBBY
HANDOVER ELEAVTOR
LOBBY
BEST
BETTER
BAD
Handover • Indoor/Outdoor handover – Adjust antenna output power and configuration j p p g BTS parameter – Control handover area within 3meter Control handover area within 3meter
Handover area Indoor/outdoor handover diameter:3-5m
Multi frequency network Indoor coverage F1/2/3
Indoor coverage F4/5/6
Optimization F7/8/9
F1/2/3 F1/2/3
Indoor coverage g F4/5/6
Optimization F4/5/6
F7/8/9
F4/5/6
F1/2/3 F1/2/3 F1/2/3
Outdoor Coverage
F1/2/3
Multi frequency network
Documents • In building solution proposal – Solution description p – Coverage plan – System diagram System diagram – Power budget calculation – Proposed antenna location photograph – System layout on floor plan ( ACAD) y y p ( ) – Measurement results
Documents – Bill of Materials: Bill f M i l • Details of How many antennas ( Omni, Panel ), • Cable type (1/2 Cable type (1/2” or 7/8 or 7/8”), ), • Splitters, Couplers
– Macro/ Micro BTS Accommodation • Type of BTS ( Micro, Macro, flexi talk etc., based on output power ) • BTS Location (to be placed in which floor ? Is there any other BTS installed by other network operators ?) y p ) • BTS configuration ( 1+1+1 or 2+2+2)
– Electrical power supply for BTS • Power to be tapped from ? • How to bring in E1 connection for the BTS • Should we put a separate electrical meter ? MCB required ? Etc., Should we put a separate electrical meter ? MCB required ? Etc.,
