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Roll Out

Roll Out

Roll-Out Management Services for concentrated or distributed projects like done following activity:

  1. Around 1500 BTS and WIMAX site installation in all provinces in Iran including SA, CW, TI and MW.
  2. After six month strict evaluation from IRANCELL Roll out team TOPCOM have been selected as one of 3 ROM vendor for country-wide and new TOPCOM is working as a ROM vendor for IRANCELL.
  3. Around 1500 BTS sites survey and planning for GSM and WLL projects.
  4. Around 500 Microwave site survey and planning
  5. Around 1200 BTS site optimization
  6. Tehran west zone managed services including 450 sites
  7. More than 70% IRANCELL core equipment installation (Including more than 700 data racks)
  8. BO and FO services
  9. Around 400 sites SWAP from 2G to 3G-4G technology (as a turnkey supplier)

Site Acquisition:

Acquisition and Power providing performance overview

As a resume of our projects in site acquisition we would like to present you the detail of the process done by our acquisition department and list of our finished projects in this manner:

Acquisition process:

1.Getting the coordination and specification of the site place from the customer, checking the place and the defined search ring.

2.specifying type of owner.

3.acquiring the site place according to the type of owner.

Checking the site place:

After getting the coordination and address of the site from our customer we will send our expert personnel to find the place with GPS and related address and to get the complete local information of the site and the owners information for the real estates in the search ring. Then according to the acquisition problems along with the base knowledge of site designing from our engineering department, three candidates will be suggested to the customer (with a complete report of their condition) to decide the best of them according to the customer’s acquisition policy.

Specifying type of owner:

 After customer announced its selected candidate out of our suggested candidates, the most important information is the type of owner that the process of acquisition depends on it:

Acquiring:

  • Personal owners:

In this situation there should be a contract between Acquisitive and owner. To perform a good low cost contract, a good studying about the owner and good manner of discuss by well conditioned employees is inevitable. This is done by our personnel in legal part of department that are divided into two parts: contracts and commercial.

The result can be each of the cases below:

  1. Renting the related real estate from the owner with a reasonable and exactly clear contract, with minimum possible charge, that all the legal aspects have been seen in it.
  2. Complete Acquisition of the real estate that rarely happens.
  • Governmental owners:

Usually in this case the Acquisition will be easily performed because two sides of contract can easily agree on a contract because there is usually good connection between the company headmasters and governmental responsibles.  And in some acquisition projects even the electrical power providing was bounded to the acquisition by the acquisitive so the governmental owner did the power providing too.

As the acquisition department, in the organization structure, there are several number of employees in charge that handle the process of acquisition. there is a manager on the top of the department that is under direct supervision of the Directorate of the company.

As mentioned before the acquisition part consists of two parts: commercial and legal

The legal unit is in charge of estimating commercial view of the contracts with owners and suggesting the best possible cost for renting or buying the real estates. This part includes the commercial and contracts sub branches. This part is equipped with a up-to-date reliable database of all the real states and the costs in every area, that is collected through out reliable and aware, usually governmental, reference points. Using this database the commercial part can estimate the minimum reasonable costs and charges that can be applied.

The real state unit performs the contracts and negotiating with owner, either personal or governmental. This part has critical job because the content of contract really depends on the way and manner of negotiating so there are really expert staff in charge of this job. The site place finding is one of this part’s duty too. With the mentioned data base this part will know how to start the negotiation and how far then can go to make a good contract.

There is no doubt that these two parts use the result of searching and studying about the place and the owner of the selected place of the site so they are firmly coupled and managed.

Power supply provision process:

After Acquisitioning the site, one of the important works to do is power supply providing for the site. This stage is directly related to local power distributing center and will start with applying a request for the power supply membership from the mentioned office.

In this part, installation has to be started because there should be something installed in the place so the power distributing center expert can visit the place and estimate the charge and the amount of work.

The next part of project is paying the charge so power distributing center can start the power distribution to the site place that includes power transmission to the place and installing counter and related stuff.

This process can either be done by power distribution office or our company depending on the contract with power distributing center. in the case that power distribution office is responsible for it we will pursue the procedure to be done as soon as possible.

And if our company is in charge we will use our expert electrician to fix this problem.

One problem that can happen during power transmission procedure is the case that there is no capacity for transformers so a new transformer should be installed and extra charge should be paid to power distribution office. We usually try our best not to encounter this problem but sometimes it is unavoidable.

Other problem is the long distance to the nearest power transmission tower. This problem can be solved negotiating with related organizations or suggesting the search ring of the site in a suitable place that is related to the customer and is there in not much flexibility in this way because of the technical limitation of site designing but as was told before in this case we will negotiate the related organizations to solve the problem.

In the general form we will use existing free equipment as much as possible to reduce the overhead.

This part of department in the organization structure consists of two parts: legal and Executive parts.

legal part is in charge of making the contracts with power distributing office and uses legal channels to perform the best and most reasonable contracts with power distributing office.

The duty of executive part is doing the executive electrical parts of the process and negotiating with power distributing office to get the permission of power supply equipment installation.

In this part we use our best electricians to perform the executive parts and our well conditioned staff for negotiation.

Here it should be noted that the site locating part and power providing executive part are under direct supervision of engineering department.

 Civil Work:                                               

The site installation process consists of the following five steps:

  1. foundation
  2. outdoor
  3. indoor
  4. grounding
  5. Activation

1- Foundation: At first TSSR is received. Thereafter a first observation is made according to the TSSR provided. Only then we can finalize the spot. After finalizing the spot  the available map is implemented on the desired place. After a final observation the desired spot is completely flattened.

The next step consists of excavating the site basement. After the excavation step the container and tower molding is performed and consequently concrete molding of the tower and container is done.

After performing concrete molding, the excavation of the ground well and ground ring is preformed for grounding purposes. We could now install the container in the desired spot.

In this stage the tower for later outdoor tasks is installed.

2- Outdoor: The first task after tower installation should be the installation of the antenna structure according to desired antenna heights and also installation of the antennas which is provided by the FSR. Once the structure is accomplished antennas could be installed on it. The next step is feeder cabling. Feeders are vertically fixed in place with feeder clamps all the way from the antennas to the tower basement. As the feeders reach the feeder ladder they are appropriately bent to fit into the feeder window. There is a ground busbar just 50cm above the ladder which could be attached to the tower. At this time feeders are connected to the ground busbar by the ground kit.

After the accomplishment of all the above, tower grounding must be pursued. Tower grounding is aimed to connect the entire tower to the ground.

3- Indoor: After the foundation phase, tower installation and outdoor tasks there comes the time to be in charge of BTS installation works. Indoor may convey any sort of closed environment such as a container, room ,….  First of all BTS rack is put in place based on the preplan provided. Rectifier racks as well as batteries and DC/AC panels are also placed appropriately. After all necessary components are placed ladders should be installed according to the feeder window position in the room.

N.B. Ladders must be placed far enough from the feeder window.

Feeders as well as other cables will then lie on the ladders all the way to the BTS  or any other component i.e. DC/AC panels.

4- Grounding: Grounding starts with excavation of the ground well. The second to be done is the digging of the ground ring which could be preceded by the insertion of a flat metal sheet deep into the well vertically placed to be in better contact with surroundings.  A copper wire is the placed on the ring and the other end goes into the well to be welded to the metal sheet. For ground kits, a busbar to busbar cable is used. IGB, EGB and container basement are crossed together and the tower is also connected to ground. After making all necessary connections,, salt and powder are poured onto the metal sheet and all other wires which could then be buried in the ground. Finally the well is filled up with earth.

5- Activation: First to be done in this phase is to connect the HDSL modems. Two modems are used in this regard. One at the site place and the other is a remote one in the telecom toll office. These two modems should be synchronized together. They are connected via a 2Mb paired wire. The final step in site activation is called site offline.

This phase consists of software manipulation of the BTS that depends on the TRX configuration. Different configurations are set via a computer and an appropriate link.

 Technology:

with our well trained staff and engineers, we have brilliant experiences in  performing BTS sites.

Topcom is also active in the part of procurement and also has partners in this part too.

 Outdoor Q.C. Manager:

  1. Check the outdoor department manager tasks step by step
  2. Check the plans with outdoor department manager. And help him to complete the plan.
  3. Check the project time table daily and report to Q.C. dep. manager
  4. Check all of the sites after finishing and compare it with standards and report to Q.C dep.manager.
  5. Evalution the quality of various executive teams and report to to Q.C. dep.manager.
  6. Managing the outdoor Q.C personnel’s and doing coordination for them to visit the sites during executive period .when needs.
  7. Making documents including pictures and reports from each site activities in the construction period.

Foundation Q.C. Manager:

  1. Check the foundation department manager tasks step by step
  2. Check the plans with foundation department manager presents. And help him to complete the plan.
  3. Check the project time table daily and report to Q.C.dep. manager
  4. Check all of the sites after finishing and compare it with standards and report to Q.C dep.manager.
  5. Evolution the quality of various executive teams and report to to Q.C. dep. manager.
  6. Managing the foundation Q.C personnel’s and doing coordination for them to visit the sites during executive period .when needs.
  7. Making documents including pictures and reports from each site activities in the construction period.

Since there are diffrent kind of standardss for each vendor, our company has many trained times whcih they are all experienced and expert and also they are relative with all standards. TOPCOM has the complete tools for Civil Works and a good experience country-wide even in rural and border points and mountains with or without access roads from -35˚C to +50˚C. every documents are produced at the same time as executing the sites with complete related specs and docs.

 Planning& Propagation Modeling:

RF planning plays a critical role in the Cellular design process. Accurate planning is essential in order to ensure that the system will provide both the increased capacity and the improvement in network quality where required.

A properly planned system should allow capacity to be added economically when traffic demand increases.

The goal is to achieve optimum use of resources and maximum revenue potential whilst maintaining a high level of system quality.

By doing a proper RF Planning by keeping the future growth plan in mind we can reduce a lot of problems that we may encounter in the future and also reduce substantially the cost of optimization.

On the other hand a poorly planned network not only leads to many Network problems, it also increases the optimization costs and still may not ensure the desired quality.

Phases of Wireless Network planning:

  • Initial Network DesignIt is a process with following outcomeNumber of Bus’s
  • Sites Locations
  • Site Configurations  :Omni/ Sectored, Antenna Height, Antenna Type, Orientations, RF Power and other parameters
  • Managing Future Growth in Subscriber Base

RF PLANNING PROCEDURES:

  •  Initial Design
  •  Nominal Plan
  • Site Selection
  • Site Survey
  • Site Planning

RF PLANNING PROCEDURES

   1.Initial design: 

TOOLS USED FOR RF PLANNING

Network Planning Tool:

  • Planning tool is used to assist engineers in designing and optimizing wireless networks by providing an accurate and reliable prediction of coverage, doing frequency planning automatically, creating neighbor lists etc.
  • With a database that takes into account data such as terrain, clutter, and antenna radiation patterns, as well as an intuitive graphical interface, the Planning tool gives RF engineers a state-of-the-art tool to:

–         Design wireless networks

–         Plan network expansions

–         Optimize network performance

–         Diagnose system problems

Propagation Test Kit

  • The propagation test kit consists of
  • Test transmitter.
  • Antenna (generally Omni).
  • Receiver to scan the RSS (Received signal levels).
  • A laptop to collect data.
  • A GPS to get latitude and longitude.
  • Cables and accessories.
  • A single frequency is transmitted a predetermined power level from the candidate site.
  • These transmitted power levels are then measured and collected by the Drive test kit. This data is then loaded on the Planning tool and used for tuning models.
  • This drive test is done to prepare generic models for network design.
  • The objective is to collect field data to optimize or adjust the prediction model for preliminary simulations.

 Propagation Tool Adjustment:

  • For a given network design there may be more than one model like dense-urban, urban, suburban, rural, highway etc.
  • The predicted and measured signal strengths are compared and the model adjusted to produce minimum error.
  • These models are then used for initial design of the network.

Traffic Modeling Tool:

  • Traffic modelling tool is used by the planning engineer for Network modelling and dimensioning.
  • It helps the planning engineer to calculate the number of network elements needed to fulfil coverage, capacity and quality needs.

Project Management Tool:

  • Though not directly linked to RF Design Planning, it helps in scheduling the RF Design process and also to know the status of the project
  • Site database : This includes RF data, site acquisition,power, civil ,etc.
  • Inventory Control
  • Fault tracking
  • Finance Management

 

CELL SIZE/COUNT ESTIMATION :

Once the Maximum allowable pathloss is known, the achievable cell size can be evaluated. Cell radius is the distance from base station where the path loss equals MAPL. Beyond this radius, the signal is too weak to be acceptable.Cell radius is calculated using MAPL and Hata’s empirical formula. The designer should notice that the coverage objectives are usually different for Urban, Suburban and Rural areas and therefore MAPL has to be calculated for each area and then cell size determined separately.

Once the cell radius is calculated, cell count estimates can be made.

   2.Nominal Plan:

A nominal plan is initially a hypothetical wireless network

and is starting point for the cell rollout process and will evolve into initial network

design. As physical sites are are identified and acquired the nominal plan is amended.

 Creating Nominal Plan stages:

  • Planning of cell sites sub-area depending on clutter type and traffic required.
  • Positioning a hexagonal grid on sites over the desired coverage area
  • Analyzing the capacity of network  so detecting:

Hot spots that require cell splits

Under-used cells that could be removed from the plan

  • Running Propagation Analysis by using generic models prepared by drive testing & prop test, running predictions for each cell depending on morphology type to predict the coverage in the given sub-areas. using the planning tool to calculate the path loss and received signal strength by based on the Co-ordinates of the site location, Ground elevation above mean sea level, Antenna height above ground, Antenna radiation pattern (vertical & horizontal) & antenna orientation, Power radiated from the antenna.

 Reseting Cell Placement( Ideal Sites):

  • According to the predictions change the cell placements to design the network for contagious coverage and appropriate traffic.

Position:

There should be a comparing the nominal coordinates to the coordinates read by surveyor to confirm the exactness of site coordinates.

Coverage/Capacity:

This process will start with evaluating the surroundings on the site according to site survey reports and deciding on the degree of importance of providing coverage and capacity on each sector. The degree of importance is rated from 1 to 5 where 1 is least important and 5 as most important.

These data will be used for more extensive planning to balance traffic requirements and coverage ranges. And then continuing with filling up corresponding data under coverage and capacity on the survey form.

This will be used as guidance for the project manager in making priorities in site rollout.

Radio frequency planning:

 After getting the existing frequency information from site survey reports if interference is very much expected, RFI measurements

should be performed to confirm if it is “safe” to put up a site in the proposed location or not.

Antenna height:

Comparing the proposed antenna heights with the nominal antenna height. It is specified that the maximum allowable deviation

of antenna height from the nominal or predicted height is 15%. As an example, if the nominal antenna height is 35 meters, variation up

to 40.25 meters for the proposed height is allowable. If the proposed antenna height is lower than the nominal height, a tower or pole

is considered to reach nominal height. Otherwise, another site location should be chosen.

Antenna height is measured above mean ground level.

Antenna direction:

 Analyzing the immediate vicinity for coverage considerations. the planner should notice that he should maintain the nominal antenna

directions as planned  as much as possible. However, nominal directions might not necessarily be the best directions to fulfill

coverage objectives. Also the RF engineer will have to decide on the proposed antenna directions and configurations considering

the following items:

Are there immediate or upcoming obstacles along the nominal antenna directions such as buildings or hills?

Do the antennas need to be re-directed to cover roads or more populated areas instead of open areas or water?

Is an omni or two-sectored site sufficient to provide coverage and traffic?

Antenna type (beamwidth, gain, diversity):

 Normally, antenna types are already determined from the plan. However, it might be necessary to change the type of antennas to be used to fulfill the site objective. The decision is affected by considering antenna characteristics such as beamwidth, gain and diversity type.

For example, urban may use the typical 65° antennas, while long roads may employ 30°

high-gain antennas to provide long range coverage.

Antenna tilt:

The tilt of antenna should also be determined in order to have better coverage

and less interference with the adjacent sites.

Site Survey  

With wireless systems, it’s very difficult to predict the propagation of radio waves and detect the presence of interfering signals without the use of test equipment. Even if you’re using omni-directional antennas, radio waves don’t really travel the same distance in all directions. Instead walls, doors, elevator shafts, people, and other obstacles offer varying degrees of attenuation, which cause the Radio Frequency (RF) radiation pattern to be irregular and unpredictable. As a result, it’s often necessary to perform a RF site survey to fully understand the behavior of radio waves within a facility before installing wireless network access points.

The ultimate goal of a RF site survey is to supply enough information to determine the number and placement of access points that provides adequate coverage throughout the area. In most implementations, “adequate coverage” means support of a minimum data rate. A RF site survey also detects the presence of interference coming from other sources that could degrade the performance of the wireless system.

When conducting an RF site survey, we consider these general steps:

  1. Visual inspection of the area. Walking through the area do reveal facts about the site plan. This is a good time to note any potential barriers that may affect the propagation of RF signals. For example, a visual inspection will uncover obstacles to RF such as metal tanks towers, mountains….
  2. Identification of the user areas. It’s good habit to mark the areas of fixed and mobile users on the diagram as well as illustrating where mobile users may roam.

Determine preliminary access point locations. By considering the

  1. location of wireless users and range estimations of the wireless system used, approximation of the locations of spots that will provide adequate coverage throughout the user areas will be possible. Planning for some propagation overlap among adjacent access points may seem necessary when number of subscribers grow.
    Mounting locations should be considered, which could be ground or rooftop towers. Recognizing suitable locations for installing the tower, antenna, cables, and power line is a vital task in any access point location phase.
  2. Data gathering. Once the surveyor is satisfied that the planned location of access points will provide adequate coverage, data regarding site installation peripherals, covered spots and barriers should be gathered. Panoramic photos of site boundaries with steps of 45 degrees as well as photos in the direction of antenna azimuth predictions should be taken to provide an asset for the site planner. Such photos must be orderly placed in the site documentation. Data regarding existing and/or reusable site installations should also be included in the document. Any reusable container, room for indoor equipment or existing tower must be listed. The survey document should also contain information about the area, environment, site address, ways to access the site place and available access time to reach the place. A screen shot of a sample documentation is provided below

Obstacle sketch must also be included in the final survey report to insure total clearance of the first Fresnel region. A screenshot of  the obstacle sketch map is provided below:

The best way to connect two separate points to each other is wireless connection. Because in this way there is no need to use physical cable and so the problems such as maintenance and etc. will be removed.

In the wireless methods, the last way is radio connection specially in the far distances. It means if you can find two points that can see each other, you can be sure your data transmission will be warranted .The radio connection has large capacity and high speed. Only optical fiber has capacity and speed more than microwave link.

One of the most critical problems in microwave link is line of sight (LOS). It means for a certain secure connection between two points it is necessary that there may be a complete direct sight but it may not be sufficient  so a suitable place in GSM view may not be suitable in microwave view. This problem will grow up when you use upper frequencies in 2 GigaHz or higher.

Therefore in a good site survey both of BTS and microwave survey must reach an agreement. It is clear that these two fields need different engineers with different skills.

But some of the activities will be equal in both fields like as finding the coordination, getting panoramic pictures and etc. in microwave survey it is too important to find the other end. In a good position that in the direct route there are no obstacles and some obstacles can not be seen by digital maps link as the other towers in the way.

So microwave survey engineers use their telescopes to check the rout and compare the actual route information with nominal information to find the best location and if they can not see the other end they may use light flashing or sun light mirror to make sure about LOS.

Technical Implementation           

Telecom implementation (TI) is TOPcom’s basic project management delivery service. TI is a stand-alone service, meaning it can be purchased independent of full project management (roll-out management). It typically entails the supply of traditional BTS installation and commissioning services but may also include, depending on the project’s scope of work, NSS telecom implementation services and RF Engineering services. The Telecom Implementation service includes the supply of a corresponding level of project management necessary to ensure service quality and delivery commitment. Project management under this scenario is limited to scheduling and managing the day-to-day activities of the implementation teams, ensuring the delivery of services is defect free and in accordance with customer specification, the creation and submission of relevant site documents, and the timely submission of change orders and customer invoices. Through this arrangement overall management of the project and customer interface resides with either the customer (supplier) or its designated Roll-Out Management (ROM) company. At a minimum the following functional areas are addressed:

  • Pre-installation site readiness survey (BTS and or NSS network elements)
  • Pick up equipment and deliver to site (BTS only)
  • Equipment installation (BTS and NSS network elements)
  • Equipment commissioning (BTS and NSS network elements)
  • Equipment integration (BTS and NSS network elements)
  • Quality inspections (BTS and NSS network elements)

 

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