Detailed Indoor Design for MSC Bab Ezzouar -
July 2004
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Title: Version: Date: Author: Executive Summary:
Indoor TEMS Transmitter Measurements for MSC Bab Ezzouar V1.1 July 19, 2004 Hatem Mokhtari This document encompasses the indoor measurements within the building at the MSC premises in Bab Azzouar. It also derive design guidelines for indoor equipment and antennas to be deployed to cope with Wataniya coverage and quality standards.
Revision History
Version V1
Date July 20, 2004
Auteur Hatem Mokhtari
Modifications Draft
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Table of Content
1
INTRODUCTION...................................................................................................................................................................... 4
2
TEST RESULTS ........................................................................................................................................................................ 4
3
CAPACITY REQUIREMENTS ................................................................................................................................................ 5
4
PROPOSED INDOOR DESIGN ............................................................................................................................................... 6
5
CONCLUSION .......................................................................................................................................................................... 9
ANNEXES & PHOTOS ................................................................................................................................................................... 10
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1. INTRODUCTION In a fast growing Mobile market, Operators seek a comprehensive and reliable quality of service. Undoubtedly Wataniya is an Operator that will have the potential to develop numerous services such as WAP through GPRS technology, and therefore acquire new subscribers. Nowadays, the need for a reliable and seamless mobile service in Algeria starts to be more and more perceivable. In the nearest future, we will have to face fierce competition and Operators will have to offer coverage in, not only outdoor locations, but indoors as well. As a good exercise Wataniya wants to deploy a complete indoor solution at the MSC Bab Ezzouar premises. This should lead to better testing of Wataniya network using different features. Wataniya will therefore have the possibility to give its own employees the opportunity to test the network reliability and QoS. We are considering a number of employees between 400 and 500 who will be based in Bab Ezzouar. Therefore, not only indoor coverage will be considered but capacity/blocking as well. This document highlights the complete process of indoor design for coverage and capacity in the MSC premises in Bab Ezzouar. This document is organized as follows : Section 2 comprises a summary of the TEMS indoor measurements (walk test), whereas Section 3 and 4 encompass the proposed design using Ericsson RBS located in the ground at the MSC, along with a rough capacity dimensioning based on the data supplied by the logistics department (# people expected, visitors, subcontractors, etc.). Section 5 is nothing but the concluding remarks and perspective capacity/coverage expansion issues. Section 6 contains the drawings of MSC building, along with the photos of our offices.
2. TEST RESULTS The following are the results of the Transmitter test in the underground, first and second floor. Annex 1 illustrates the transmitter location, measurement points, and the photographs taken inside each floor under study. Each table below depicts both the location of measurement and the received signal strength using scan mode on channel 80 within Wataniya allocated spectrum.
Underground TX1 EiRP= 17dBm Indoor Antenna Mast Height = 2.33m Location T1-1 Rxlev -45
T1-2 -60
T1-3 -60
T1-4 -85
T1-5 -80
T1-6 -62
T1-7 -50
T1-8 -70
T1-9 -50
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1° Floor TX2 TX=17dBm Indoor Antenna Mast Height =2.40m Location T2-1 Rxlev -55
T2-10 -78
T2-11 -72
T2-20 -54
T2-21 -45
T2-2 -72
T2-12 -85
T2-3 -51
T2-13 -83
T2-22 -61
T2-4 -61
T2-14 -75
T2-5 -68
T2-15 -82
T2-6 -72
T2-16 -80
T2-7 -75
T2-17 -60
T2-8 -81
T2-18 -60
T2-9 -74
T2-19 -70
T2-23 -55
2° Floor TX3 EiRP=17dBm Indoor Antenna Mast Height =2.40m Location T3-1 Rxlev -50
T3-10 -76
T3-11 -78
T3-2 -50
T3-12 -75
T3-3 -46
T3-13 -71
T3-4 -48
T3-5 -56
T3-6 -53
T3-14 -54
T3-15 -47
T3-16 -90
T3-7 -67
T3-8 -
T3-9 -
3. CAPACITY REQUIREMENTS 3.1.
General Assumptions
Bab Ezzouar offices expect a massive move within the next few days, which will lead us to do some assumptions regarding the number of employees and visitors within the MSC premises. If we assume that not less than 400 people will be moving there, one may add up about 100 visitors, subcontractors, and security workers. 3.2.
Expected Traffic Estimation
If we assume that the traffic intensity per user is 25 mE the total expected traffic in Busy Hour would be 12.5 Erlang. Considering a 2% blocking probability leads to a number of minimum required channels of 3 according to the Erlang B Table. 3.3.
TRU Requirements
Normally only one sector is sufficient (3 TRUs) for the whole building but for coverage reasons we recommend the use of 2 sectors. We recommend to use 4
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TRUs for the sake of consistency with Ericsson equipment. Each sector handles about 4 floors. The reason is that if we use only one sector, we would have to split the power to reach the upper floors leading to major lack of RF power. However, if the BTS was located somewhere in the middle (vertical wise) we would be able to use only one sector and distribute the power roughly equally between the lower and upper floors. 3.4.
Frequency Planning Issues
4 TRUs have to be planned manually but also will have to be considered in the macrocell frequency planning for interference purposes. BCCH and TCH frequency allocations of the indoor site can be performed using Wataniya Spectrum assignment. There are, however, two constraints that have to be carefully respected : A) Minimum 2 Channel-spacing between macro layer on the roof top and each BCCH/TCH channel selected on the indoor sectors B) Once the indoor channels have been assigned, these have to be included manually in the AFP for macrocell frequency assignment of the MSC neighbours to avoid co-channel interference. Furthermore, handovers should never happen from indoor cells to the MSC macro layer to avoid overloading the macro layer. The latter should be exclusively assigned to outdoor customers, whereas indoor users will have to use the indoor equipment resources. This can be done by forcing subscribers of the 2 indoor sectors (BSS Parameters Settings) not to handover to the macro layer resources.
4. PROPOSED INDOOR DESIGN
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Detailed Design for Floors : -1, 0, +1, and +2
Power Budget Calculation Link S1->A1 S1->A2 T1->S2 S2->A3 S3->A4 S3->A5
Antenna ID A1 A2 A3 A4 A5
Cable Type 1/2'' 1/2'' 7/8'' 1/2'' 1/2" 1/2" Antenna Gain (dBi) 2 2 2 2 2
Approx. Length 40 m 30 m 70 m 20 m 15 m 15 m
Antenna Type K 741572 K 741572 K 741572 K 741572 K 741572
Cable losses (dB) 2,64 2,30 4,35 4,00 4,00
Total Loss (dB) 10,74 10,40 9,45 12,20 12,20
EiRP (dBm) 34,3 34,6 35,6 28,8 28,8
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Detailed Design for Floors : +3, +4, +5, +6
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Power Budget Calculation Link S6->A6 S6->A7 S7->A8 S7->A9 S8->A10 S8->A11 S9-A12 S9-A13 RBS->T2 Antenna ID A6 A7 A8 A9 A10 A11 A12 A13
Cable Type 1/2'' 1/2'' 1/2'' 1/2'' 1/2'' 1/2" 1/2" 1/2" 7/8'' Antenna Gain (dBi) 2 2 2 2 2 2 2 2
Approx. Length 30 m 30 m 30 m 30 m 30 m 30 m 30 m 30 m 90 m Antenna Type K 741572 K 741572 K 741572 K 741572 K 741572 K 741572 K 741572 K 741572
Cable losses (dB) 5,83 5,83 5,83 5,83 5,83 5,83 5,83 5,83
Total Loss (dB) 16,93 16,93 16,93 16,93 16,93 16,93 16,93 16,93
EiRP (dBm) 28,1 28,1 28,1 28,1 28,1 28,1 28,1 28,1
5. CONCLUSION While we performed TEMS Test Transmitter measurements we used an EiRP of 17 dBm. Indoor coverage was more than enough as we reached between -45 to 85 dBm. However, offices were completely empty from people and furniture. We still believe that a minimum of 25-28 dBm should be a comfortable EiRP to provide indoor coverage according to our design (see EiRP Table for Access points A6 till A13). This design is based upon a concept of worst-case scenario regarding cable lengths and office occupations. The expected powers should be higher, especially for higher floors as the cable lengths are definitely shorter. Besides, few losses have to be considered in a more accurate design because of additional short hiflex ½” jumpers and connectors. We assume however that the design still remains a “draft” as we do need a final site visit to optimise the losses especially the feeder lengths. Concerning the number of TRUs, starting with a two-sector configuration of 4+4 this should suffice to cope with the expected traffic requirements. Final step in the design is to setup the right BSS parameters such as HO Margins, RxLev_Access_Min, BS_TXPWR_MAX, etc. This should avoid HO with external sites and minimise interference to the users on street at the vicinity of the MSC Bab Ezzouar. Frequency assignment has to be done properly to make our network spectrum-efficient as two layers (Macro and Indoor) should be carefully planned. The Access Points (Indoor Antennas) have to be placed at the TEMS Test points.
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Underground floor General Layout
T1-4 T1-2 T1-3
T1-1
Photo 1 TEMS TX
T1-8
T1-5
Photo 2
T1-6 T1-7
T1-9
Photo 3
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First floor General Layout
T2-19
T2-20
T2-1
T2-15 T2-17
T2-18
T2-2
T2-21
T2-16
TEMS TX
T2-14
Photo 4 T2-23
Photo 5
T2-3
T2-22
Photo 9 T2-13
Photo 8
Photo 6
Photo 7 T2-9
T2-5 T2-6
T2-7
T2-8
T2-4
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T2-10
T2-12
T2-11
Second floor General Layout
T3-11 T3-9
T3-10 T3-12
T3-8 T3-13 T3-7 T3-15 T3-6
T3-14
T3-16
Photo 10
TEMS TX T3-5
T3-4
T3-1
T3-3
T3-2
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PHOTO 1
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PHOTO 2
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PHOTO 3
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PHOTO 4
PHOTO 5
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PHOTO 6
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PHOTO 7
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PHOTO 8
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PHOTO 9
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PHOTO 10
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DESIGN PLAN : TOP VIEW (UNDERGROUND AREA)
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A1
RBS2206 Location @ Ground Floor
DESIGN PLAN : TOP VIEW (GROUNDFLOOR AREA)
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RBS2206 Location @ Ground Floor
A2
DESIGN PLAN : TOP VIEW (1ST FLOOR AREA)
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A3
To Splitter S2
DESIGN PLAN : TOP VIEW (2ND FLOOR AREA)
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To Splitter S3
A5
A4
DESIGN PLAN : TOP VIEW (3RD FLOOR AREA)
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A7
To Splitter S6
A6
DESIGN PLAN : TOP VIEW (4th FLOOR AREA)
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A9
To Splitter S7
A8
DESIGN PLAN : TOP VIEW (5th FLOOR AREA)
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To Splitter S8
A11
A10
DESIGN PLAN : TOP VIEW (6th FLOOR AREA)
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A13
To Splitter S9
A12
GENERAL LAYOUT : SIDE VIEW
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+6
+5
+4
+3 +2
+1
RBS 2206 Tapper T1
Ground Floor -1
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Splitter S1
