LAC Coverage Enhancement Solutions

8/10/2019 LAC Coverage Enhancement Solutions

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Version number on title master

Rural coverage enhancement

Sitapathy Chavali

15 Oct 2008


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Confidentiality level on slide master

Version number on slide master

Corporate Technical Group

Rural coverage enhancement solutions

Rural coverage solutions

Antenna & TMB

solution

2 Port Antenna Combiner Bypassed

4 Port Antenna Combiner Bypassed

21 dBi High Gain Antenna

TMB (Tower Mounted Boosters)

Equipment type Flexi RRH site ( 2/2/2)

Software solutions

Antenna hopping

ICE ( upto 3/3/3)

SRC


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A. 2 Port Antenna Combiner Bypassed

Recommendations

Use of 2 Port Regular Antenna for Sector

up to 2 Trx in Combiner Bypass mode.

Pros

Gain of 3 dB in the Link Budget.

Enhanced Coverage footprint for Rural single Site towns.

Use 4 Port Antenna for More than 2 Trx Sector to keep

the Trx in Uncombined mode

To use in all rural

sites with 2 TRX

Tx1Tx2

2 Port Antenna (Combiner Bypass)

Standard BTS Configuration

2 Port Antenna with Combiner Bypass

3dB Gain

Path Loss


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Antenna sharing options Turvihal - TVL001

Pre Airtel RxLev ( Idle Mode)Pre Vodafone RxLev ( Idle Mode)

2.5 Kms rad

4.0 Kms rad

VF coverage is 40% of Airtel

GSM ht : VF 40 mts ; Airtel 41 Mts


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Post Vodafone RxLev ( Idle Mode) Post Airtel RxLev ( Idle Mode)

4.0 Kms rad

3.2Kms rad

Antenna sharing options Turvihal - TVL001

VF coverage increased to 64% of Airtel (from 40%)


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Antenna sharing options JawaleraJWL001

Pre Airtel RxLev ( Idle Mode)Pre Vodafone RxLev ( Idle Mode)

2.5Kms rad

3.5 Kms rad

VF coverage is 51% of AirtelGSM ht : VF 39 mts ; Airtel 48 Mts


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Post Vodafone RxLev ( Idle Mode) Post Airtel RxLev ( Idle Mode)

3.5Kms rad

3.2 Kms rad

Antenna sharing options JawaleraJWL001

VF coverage increased to 85% of Airtel (from 51%)


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C. 20dBi, 65High Gain Antenna

Recommendations

Use of 20dBi High Gain Antenna

with combiner bypass for 2 TRX sector

Pros

Gain of up to 6 dB in the Link Budget.

Enhanced Coverage footprint for Rural single Site towns.

To use in all rural sites

Tx1Tx2

20dBi, 65 High Gain Antenna

Make

Katherine

Andrew

Model No -1800 MHz

K742186

HBX-6517DS-VTM


2 Port 20 dBi Gain Antenna

3dB Gain

Path Loss

6dB Gain

2 Port 20 dBi Gain Antenna with comb bypass

Under trials in AP & Kar


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F. ICE (Intelligent Coverage Enhancement)

Recommendations

Use ICE feature to enhance Capacity from2 Trx to 3trx without loss of Coverage.

Initial configuration with 2/2/2 combiner

bypassed.

Addition of 3RdTrx in sector with ICE.

Pros Gain of 3 dB in the Link Budget for BCCH

layer.

Capacity gain in TCH layer.

To use in all rural

sites up to 3 TRX

ICE Implementation


With ICE implementation

3dB Gain for coverage Layer

Path Loss


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G. SRC (Smart Radio Concept)To use in all rural

sites & highway sites

Standard GSMterminal

Nokia UltraSiteEDGE BTS with

SRC

Downlink boosted by 5 dB*

High Gain MHAfor all RX feeders

Uplink signal receptionwith 4 antennas (4UD)

Transmission via two antennas (IDD)

Uplink enhanced by 5.5 dB*

Constructive combining of all4 received antenna signals

DL signal (data/voice)transmitted via twoTRXs using time delay

and phase turning


With SRC + TMA

5dB Gain

Path Loss


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Corporate Technical GroupRural coverage enhancement solutions

E. Flexi Feederless Site

Recommendations

Use Feederless solution to avoid cable loss

Use to overcome complicated site Installations.

Pros

Gain of approx 3 dB in the Link Budget .based on cable length

avoided

To use in all rural

sites up to 2/2/2

System DC

Sector

Sector

Sector

Fiber optics link

Ethernet link

DC supply

Flexi Feederless


With Flexi Feeder Less Site

2.5dB Gain

Path Loss

Documents

LAC Coverage Enhancement Solutions