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Descripción: Operating ACT5diff
Descripción: seismic and retrofitting of buildings
Bangalore Metro Rail Corporation Assignment
Circle : Karnataka
At Underground Tunnel coverage will be provide through 1-5/8 Leaky Cable solution. RF signal can be feed from BTS Room at either end of the Stations to till midway of the tunnel between two stations. So we need to cover half of the tunnel distance from each station end. If we do passive solution we can extend the coverage maximum 200 to 250 Mtrs based on the BTS location and other input cable losses. In this case maximum tunnel stretch should be 500Mtrs only considering the connectivity from both side of the tunnel. ”
In BMRCL, tunnel length between stations is varies from 750Mtrs to 1500mtrs. So, we need to provide Active solutions by using Fiber Optic Repeaters (FOR) to extend the coverage in the tunnel. If it is with in 1KM stretch then we need to put 1 Fiber optic repeaters (RU) in the tunnel. If it is 1.5KM stretch then required 2 Fiber optic repeaters (RU) to be installed inside the tunnel. Underground station coverage can be extended from the BTS room by the help of a Distributed antenna system and proposed solution for the UG station is SISO when it comes for LTE. Elevated stations coverage solution is also in similar way by extending the coverage from BTS room to the floors by a set of distributed antenna. Present solution is proposed with the passive components range from 698 to 2700MHz.
As per RFP, The solution designed to provide the In-building Solutions (IBS) for Shared Mobile (Cellular) Coverage (2G/3G/4G) in Tunnels and Underground Stations of Cubbon Park to City Railway station (Phase -1), Kempegowda Station to Krishna Rajendra Market (Phase-2) of BMRC Network. The solutions proposed is the Hybrid solution with the combination Fiber optic repeater with self radiating coaxial cable.
Solution is designed for this project supports multiple operator in GSM900, GSM 1800, WCDMA and LTE 1800 FDD and 2300 TDD technologies and the self radiating coaxial cable supports up to 3 GHz frequency band.The solution approach to the BMRCL stations are on passive and the tunnels are on active solutions. Phase 1 and 2 each station planned with 6 sectors of BTS irrespective of the technology band of mobile communication. Each station planned with 4 sectors and the rest 2 sectors for the nearest UP/DN tunnels. Key points considered while designing the wireless system is given below,
Create a common, non- discriminatory comprehensive coverage solution provides equal access for all wireless operators. Accommodate current technology and capacity requirements with the ability to add capacity and supports for emerging future technologies. The system supports independent cell topologies for each operator with ready optimized link budget. Active devices used in this project can be control and monitor locally or remotely via OMT/NMS software.
The Hybrid solution planned for the BMRC network is the combination of passive solution at stations and the active solutions at the tunnels.BTS is placed on the GSM equipment room at concourse level of each stations.The active units selected for this projects are placed at GSM room and at a particular distance at tunnels.The below figure shows the active equipment placement at tunnels.
The equipment connectivity for Cubbon Park Station to City Railway station is given below.
Fiber optic repeater consists of master unit and remote unit and the connectivity between master units to remote unit is through single mode fiber. One master can support up to 4 remote units and the fiber link budget can go up to 10 dBo. BTS out puts are combined by using POI and the combined output power per technology is fed in to the master unit. Point-of-Interface (POI) units combine multiple wireless communication systems to share a common distributed antenna system. POI consists of High quality combiners, duplexers and filters to achieve high system performance. POI is designed to use for all existing mobile technologies such as CDMA, GSM 900, GSM 1800, & WCDMA also. The POI equipment shall be one of the key components in the DAS project, as it involves multi-operators using several different wireless communication systems. POI is a custom made product based on the technologies and number of operators and required ports to fulfil the system design requirements. Its recommended to use 14 input ( GSM-4, DCS-6, WCDMA-4 and 2 out put) and 2 out put ports for this project so that all the existing operators allocated by DOT, India in Karnataka telecomm circle. Master unit receives the RF signal from the BTS and converted in to optical and send over through fiber optic cable and it is converted back in to RF and amplifies in the remote units. Out put power of the remote units is 43 dBm per technologies and this can be extended with the help of a self radiating cable to the tunnel based on link budget calculation and coverage requirement. The system is designed with 50 meter coverage overlapping at the sector end to take care the hand over smoothly.
The below block diagram shows the cell planning at stations and the tunnels. In Phase 1 from Cubbon Park to City Railway Station we have planned BTS at each stations with 6 sectors.4 sectors for the station coverage and the 2 sectors 1 each for DN/UP tunnels. Station concourse area planned with 2 sectors and Platform and undercraft also planned with 2 sectors.BTS to be placed at the GSM room available at each station and the connectivity for the Police coverage would be taken up from Outdoor by using a yagi antenna placed at fire escape staircase near to GSM room.
1
Sector -1
5
Sector -5
2
Sector -2
6
Sector -6
7
Sector -7
3
Sector -3
4
Sector -4
SL No
Technology
No of Carrier 8
1
GSM 900MHz
2
GSM 1800MHz
12
3
WCDMA
4
4
LTE
4
Coverage Better than -75 dBm @ 95% locations Better than -75 dBm @ 95% locations Better than -80 dBm @ 95% locations Better than -98 dBm @ 95% locations
The above table shows the design criteria of the solution. The link budget calculation is important to realize the coverage requirement and has to be done considering the full traffic and coverage overlapping between antennas, this will help the existing operator to add additional carriers if required or to accommodate new operators or new technologies. The tables below shows the link budget of tunnels in the worst case scenario based on the length with respect to the different frequency band. Link Budget Calculation for 1-5/8" Co-axial Leaky Cable Description BTS/NODE-B/E NODE-B POWER MS output power POI/Combiner loss Longitudinal loss of 1-5/8" leaky cable 95% of coupling loss Range correction to 5 M Input cable length 7/8 Two way splitter Jumper cable loss Train penetration Loss Connector loss (0.5dB) Body loss Cell edge confidance @95% probability Rx level at MS
