NEWSLETTER ISSUE SPECIAL CASE STUDY EDITION for TETRA World Congress in Dubai

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1 NEWSLETTER ISSUE SPECIAL CASE STUDY EDITION for TETRA World Congress in Dubai

2 Creowave Newsletter Issue Greetings from Creowave! Creowave is delighted to publish this second issue of Creowave Newsletter in You are now holding a Special Edition of the Newsletter, covering several case studies in interesting locations such as airport, underground tunnel, Formula 1 circuit as well as a large shopping mall. Meet Creowave at one of the years most important events - the TETRA World Congress 2012 in Dubai. We welcome You to visit the Creowave stand F502! 2

3 Contents: Case stydy: Enhancing TETRA network coverage in Deira City Centre shopping mall in Dubai Case study: Enhancing TETRA network coverage in Formula 1 circuit in Abu Dhabi Case study: Enhancing TETRA coverage in an Airport Case study: Building TETRA coverage into energy production tunnels Case study: Building TETRA coverage in a metro debot in the middle of Helsinki city Ceowave introduces next generation Frequency Shifting Repeater For more information, please visit Creowave stand F502 at TETRA World Congess in Dubai Receive the Creowave Newsletter to Your ! Subscribe from here 3

4 Reliable and effective public safety communication is crucial while managing critical and life threatening situations. The TETRA network used by authorities worldwide is the leading technology to handle the public safety communication. To ensure the perfect function of TETRA network, also in extreme environments that have weak TETRA coverage or lacks the coverage totally, Creowave Oy provides smart TETRA coverage solutions with high-class TETRA repeaters. Enhancing TETRA network coverage in Deira City Centre shopping mall in Dubai Creowave and its local partner, Waves Middle East, were chosen to enhance the TETRA network coverage in one of the first big shopping malls in Dubai in the spring of With careful and professional site planning the TET- RA coverage was able to be enhanced with one single repeater ensuring a very cost-effective solution for the customer despite of the large surface area of the Deira City Centre. Deira City Centre is located in Dubai, in United Arab Emirates. It is considered as the first large-scale, mixed-use shopping mall in Dubai with retail outlets, restaurants, entertainment facilities and hotels it features over 370 stores and services. It was opened to the public in November 1995 and it encompasses over square meters. With over 19 million annual visitors, the Deira City Centre is one of the region s most visited destination. In a destination as large and popular as the Deira City Centre, security plays an important role. In spring 2011 Creowave s local partner, Waves Middle East, was contacted by Deira City Centre Management. After changing from an analog system to a digital one, the shopping mall was lacking TETRA coverage in several critical locations. The Deira City Centre uses Nedaa s TETRA network. Nedaa is the leading provider of safe and advanced communications services in Dubai. Nedaa is the TETRA operator that provides network services to both government and approved private entities, as in the case of Deira City Centre. Deira City Centre has over 200 tetra users, including maintenance, security and operations. The original TETRA infrastructure was good enough to 4

5 Deira City Centre shopping mall. cover the majority of the premises but important parts such as fire exits, maintenance and security corridors as well as parking halls were lacking TETRA coverage. In the case of an emergency, the lack of an adequate coverage could cause life-threatening situations. It was considered extremely important to get the TETRA coverage to a required level, and as a solution Creowave and its TETRA repeaters were chosen. Creowave and Waves Middle East provided TETRA coverage to the premises as a turnkey solution delivering site survey, site RF planning, and required hardware from TET- RA repeater to antennas and cabling, installation and final approval. During the site survey, it was discovered that the majority of the premises were covered with the original TETRA infrastructure. The Deira City Centre consists of 3 floors ground floor and the 1st and 2nd floor. In addition a separate parking hall called Maf Tower Basement, next to the mall needed to be covered. The ground floor includes for example a large parking space as well as maintenance and security premises. The 1st and 2nd floor consist of shopping, dining and entertainment services. Since the RF specialists from Nedaa appoint certain carriers to be used based on traffic loading, the choice of repeater type for the site was clear from the start. A TETRA Channel Selective Repeater was needed to amplify the certain carriers. The Creowave TETRA Channel Selective Repeater was installed on the ground floor of Deira City Centre near the security and maintenance premises. With over three kilometers of cabling and extensive antenna network the amplified TETRA network signal was carried to the whole shopping centre. Special requirement set by the Deira City Centre Management was to install the cabling and antennas in a way that those won t be visible for the public and should blend with the surroundings. In addition all the 5

6 Creowave Site Planning The floor plan of ground and first floor of the Deira City Centre. The blue color indicates the areas where the TETRA coverage was already strong from the beginning whereas the green color indicates the areas covered with the repeater. In addition to the smart TETRA repeaters, Creowave Professional Radio business area offers services from site survey, consultation and coverage planwork needed to be carried out, must be done when the ning installation care. Creowave provides accurate site planmall wasto closed. This essentiallyand meantcustomer work could only be done at night. ning and calculations for the end customer. Coverage modelling is done with ibwave Design Software. This allows Creowave to provide strong, reliable TETOn project completion extensive tests conducted by Nedaa RA communications infrastructure plans as well as serve the customer with and the customer the TETRA coverage was discovered to well documented design enabling straightforward installation and use. be on an excellent level in the entire shopping centre, including the areas that originally had weak coverage or no Creowave uses ibwave Design Software in site plancoverage at all. The project proceeded as planned and as a ning of indoor, tunnel and hazardous area environresult, the end customer was very pleased to discover that ments. The software is extremely useful in complex the TETRA network coverage has now been enhanced to a buildings and tunnel networks. Floor plans of the site good level and the safety of staff working in Deira City Cencan be imported straight to the software as well as the tre as well as the safety of the enormous amount of annual level of base station signal at the site. The floor plans visitors has been secured. can be edited in software to reflect the buildings physi- The professional team of Creowave is able to make accurate TETRA network site plans by importing the repeaters as well as other needed components, antennas, leaky feeders etc. to the program. Customer specified parameters and requirements can be set easily. Network validation and advanced calculations verify the assumptions by error checking, compliance verification cal environment when needed and add annotations to as well as uplink and downlink calculations. When the capture the buildings materials and RF characteristics. site plan is finished, Creowave is able to provide an accurate estimation of costs and equipment needed to enhance the TETRA network coverage on the site. Creowave Site Planning can be used in the following environments: TETRA Indoor Coverage TETRA Tunnel Coverage TETRA Hazardous Area Coverage 6

7 The floor plan of the second floor of Deira City Centre as well as the Maf Tower Basement. The blue color indicates the areas where the TETRA coverage was already strong from the beginning whereas the green color indicates the areas covered with the repeater. We are very proud to be associated with this project. We had 60 days to compete this project from the time of order placement, and thanks to the excellent support from Creowave, the DCC Mall Management team, Nedaa and the Waves personnel we were able to complete the project within the milestones as scheduled. James T. Samuel CEO, Waves Middle East 7

8 The Yas Marina Formula 1 circuit in Abu Dhabi, United Arab Emiates. Enhancing TETRA network coverage in Formula 1 circuit in Abu Dhabi Creowave Oy enhanced the TETRA network coverage in the Formula 1 circuit in Abu Dhabi, in U.A.E. Multiple TETRA Repeaters were installed to the Yas Marina racing circuit in order to secure the safety of the massive racing events. Formula 1 World Championship is one of the worlds most followed and most spectacular sports in the world. The high profile and popularity of Formula 1 makes the championship an obvious merchandising environment and sport with a great financial effect. F1 has its roots in Europe but today the championship also consist of various races outside Europe in Asia, Australia, Middle East as well as South and North America. One of the latest built F1 circuits is located in Abu Dhabi, in United Arab Emirates. The Yas Marina F1 circuit, in Abu Dhabi, was built in 2009 and the circuit was opened to the public in GP2 racing event, one week before the main the event of the year, the Abu Dhabi F1 Grand Prix. In an event with such a popularity and attention as Abu Dhabi F1 Grand Prix with approximately live spectators, thousands of organizers and staff as well as the teams and drivers, the safety of them all has to be ensured extremely well. In case of an accident or some other disaster the communication has to work without problems. During the F1 race in Yas Marina circuit there are four TETRA networks that are used for communication. One of these networks belongs to the organizing party of the event. This network is used by circuit organizers e.g. security personnel, security guard, first aid, parking and catering. The three other networks used during the race are used by the teams and drivers, the 8

9 The layout of the Yas Marina F1 circuit. police and the FIA, the Fédération Internationale de l Automobile. The users of the TETRA network used by the staff of the circuit are divided into user groups. These groups are prioritized in case of some disaster the top level management has the priority to use the network. After the first F1 Abu Dhabi Grand Prix arranged in 2009, the organizers noticed some lacks in the coverage of the TETRA network. Because of the high profile nature of the Formula 1 Grand Prix this was not acceptable and the organizers wanted to raise the coverage level even higher. In the Yas Marina racing circuit area there were already one TETRA base station installed. However, the coverage was not on needed level at some points of the circuit and in some buildings and stands. In several cases the large hotel complex located in the middle of the race circuit blocked the base station signal and lacks in the TETRA coverage occurred. In order to enhance the coverage Creowave Oy, together with their local partners Waves Middle East, was chosen to provide TETRA coverage enhancement solutions for the circuit area. Creowave is the leading company in providing Radio Frequency & Microwave Electronics solutions for extreme environments. Company s business area of Professional Radio offers TETRA repeater solutions to enhance the TETRA network coverage in extreme environments. Creowave and Waves visited the circuit in spring 2010 and did a site survey. TETRA repeaters were discovered to be a perfect solution to solve the coverage issues. The project to enhance the TETRA network coverage in the circuit area started in the summer of As mentioned, multiple Creowave TETRA Repeaters were installed to make sure the 9

10 TETRA coverage would be on the required level throughout the race circuit. Security offices and first aid were mentioned to be one of the most critical areas where network coverage is required. As mentioned, one basestation already existed at the circuit area. The basestation is located in the middle of the circuit area. TETRA Repeaters were installed around the basestation throughout the circuit area to enhance the TETRA signal in buildings around the circuit. In February 2011 final tests in the circuit area were made by Creowave and Waves Middle East. The repeater sites are presented next. One repeater was installed to an underground tunnel in the circuit area. The tunnel is used by the organizers and originally lacked adequate TETRA coverage. The repeater was installed together with uplink and downlink antenna. The uplink antenna carries the base stations signal into the tunnel and to the repeater. The repeater enhances the signal and downlink antenna delivers the enhanced signal to the tunnel. In the final tests made in February 2011 the TETRA network coverage discovered to be on an excellent level on all areas around the tunnel. Creowave TETRA Band Selective Repeater installed to the circuit area. In the final tests made in February 2011 the TETRA network coverage discovered to be on an excellent level on all areas around the tunnel. The measured field strengths varied between -38 dbm and -88 dbm. To point out the effect of the TETRA Repeater the repeater was turned off to see the field strengths without the repeater. The TETRA radio was not able to log into the network at all without the repeater. After the repeater had been turned on once again the field strength was measured to be around -50 dbm. The situation with the second repeater was quite similar to the previous repeater. It was installed also to an underground tunnel in the circuit area. The coverage was enhanced by using TETRA Repeater as well as uplink and downlink antenna. In also this site the coverage was verified to be excellent. The field strengths varied also in this tunnel between -38 dbm and -88 dbm and when the repeater was turned off the coverage was gone. During the F1 races the racing team staff and the drivers have facilities for their meetings and preparations where they spend their time during the races. There is one facility for each race team. To secure the safety of the drivers and teams an 10

11 An uplink antenna receiving the basestation s signal and delivering it into the repeater. adequate TETRA coverage needs to be ensured also for these buildings. TETRA Repeaters were installed into four of these facilities. The TETRA network coverage in all facilities was already quite good originally but in some areas the coverage was wanted to be enhanced. In the final tests the coverage in these facilities was measured to be -52 dbm and outside the buildings -70 dbm. The circuit is surrounded by multiple stands for the spectators. Creowave TETRA Repeaters were also installed into some stands to secure the comprehensive communication of the organizers and security and to secure the safety of spectators as well as drivers. The stands also include VIP areas as well as first aid premises. In one stand the repeaters were installed in both ends of the stand using uplink and downlink antennas carrying the signal all the way through the stand ensuring the good TETRA network coverage. Another stand building was more challenging site. The base station signal was not able to reach the stand completely causing problems in the coverage. However, with the TETRA Repeater the challenges have been solved well. An uplink antenna was installed to the stand so that it is pointing right to the basestation. The signal is then carried to the repeater and downlink antenna distributes the enhanced signal all the way to the tunnel. Also this stand was verified to have a good TETRA network coverage after the installation. Needs for TETRA coverage enhancement solutions were also discovered in the security officer s premises. Repeaters were installed into the premises to ensure the adequate coverage in also these locations. In the final tests the coverage was discovered to have improved to an excellent level causing no more lacks in the TETRA coverage. In the circuit area there are several buildings that are not so visible for spectators. In addition to the stands and pit buildings there are several service buildings used e.g. as a storage by teams during tests and for administrative purposes. For these locations TETRA coverage enhancement solutions was also needed. In addition to the F1 race circuit itself, the Yas Marina circuit area provides also opportunities for Drag Racing. 11

12 The area consists also of Drag Racing circuit and buildings related to the race. To ensure the perfect communication also in the Dragster events TETRA Repeaters were installed to some facilities that also include premises for first aid and security offices. The final tests made in February 2011 verified that Creowave and Waves have successfully provided the Yas Marina racing circuit with TETRA enhancement solutions that have ensured the comprehensive TETRA network coverage in the circuit area. 12

13 Enhancing TETRA coverage in an Airport Creowave Oy was chosen to deliver turn-key TETRA network coverage enhancement solution to the Oulu Airport to secure the communication and safety of travelers as well as the several authorities working at the airport. Oulu Airport is located in the northern part of Finland, in Oulunsalo, about 15 kilometers from Oulu city center. Oulu Airport is run by Finavia Corporation which maintains the network of 25 airports in Finland. Finavia Corporation serve their customers in five different business areas; airport operations, air navigation, commercial operations, real estate and airport services. Being responsible for 25 airports Finavia is also responsible for their infrastructure and development. Finavia controls the use of Finnish airspace and provides air navigation services at the airports. Approximately people work for Finavia Group. The Oulu Airport is a location where several authorities have to work and communicate fluently in order to secure the operations at the airport as well as to secure the safety of travelers and staff. The border authority as well as the police, customs, security and check-in personnel uses the TETRA network on daily basis. Oulu area and its attractiveness for tourists and business travelers have grown year by year. This has led to a drastically growing number of aircraft travelers and as an unavoidable, positive result, Oulu Airport needed to be expanded. The new extension of Oulu airport was introduced at the end of September All operations beyond the security check area were transferred to the new terminal. In one year s time the airport was being expanded in size by 50%. Naturally, since the building was now radically larger the security of the passengers and employees needed to be re-checked and communications requirements re-evaluated. In June 2011 Finavia chose Creowave to make a site-survey and a coverage plan of the TETRA coverage at the airport. In Finland the TETRA network is called VIRVE network and it is used by the used by the Finnish authorities all over the country. 13

14 The floor plan of the Oulu Airport. VIRVE is controlled and upheld by State Security Networks Ltd. which also inspects and approves all VIRVE network sites. In site survey conducted by Creowave Oy in July 2011 it was immediately recognized that the signal was weak in both new and old parts of the airport. The TETRA coverage did not reach all the new premises - cellars, premises for customs and the border guard and most importantly, the basement of the air-traffic control tower. In addition it was discovered that also areas located in the older part of the airport such as check-in area, baggage hall and air shelter lacked an adequate TETRA coverage. New security check area had not been finished at the time of site survey but was already lacking TETRA signal even though all the walls had not being built yet. These lacks in the TETRA coverage could cause life-threatening situations and the TETRA network coverage had to be enhanced. Also the authorities working at the airport clearly told during the site survey that problems in TETRA coverage was discovered in many locations. To ensure reliable connections and safety, field strength target for the TETRA signal has been set to be -85dBm. The target for the signal in indoor locations has been set by VIRVE. The goal was to have the TETRA signal greater than this at 95% of the covered area. This led to the end target of having the average field strength better than -75dB. Creowave uses ibwave Design Software to provide a thorough and up-to-date coverage plan for the end-customer. To ensure the targeted signal levels, two TETRA Channel Selective Highpower Repeaters (CWR 380 HP2) were chosen to enhance TETRA network coverage in areas which had been noticed to have weak coverage. Use of TETRA Channel Selective Highpower Repeaters in this case does not only assure reliable communications in the whole airport but also leaves an opportunity for possible enlargements of the building in the future. The repeaters were planned to be installed to the equipment premises in order 14

15 to have easy access to the antennas at the airport roof. For the basement of air-traffic control tower one TETRA Channel Selective Repeater (CWR 380 TH 2) was an adequate and cost-effective solution. For the older part of the airport, comprising for instance the check-in area, baggage hall and air shelter, a TETRA Channel Selective Highpower Repeater (CWR 380 HP2) was chosen. Its maximum RF output power for downlink is +36 dbm and maximum gain 85 db. The ground level indoor coverage is achieved with a leaky feeder and two antennas while the 1st and 2nd floor coverage are both realized with two indoor antennas. In aisle and tunnel areas the TETRA indoor coverage is enhanced by connecting the repeater signal into leaky feeders placed at the cable shelves. Open areas are covered with indoor antennas. This is done similarly at all parts of the airport. Also for the new premises of the airport TET- RA Channel Selective Highpower Repeater (CWR 380 HP2) was necessary. At this part of the airport the ground floor coverage is ensured with two indoor antennas and leaky feeders while the 1st floor indoor coverage is achieved with two indoor antennas. For the air-traffic control tower a repeater with lower power was sufficient to ensure the set signal levels and coverage. The maximum output power of Creowave TETRA Channel Selective (CWR 380 TH2) is +17 dbm and maximum gain 85 db. The ground floor coverage of the air-traffic control tower is achieved with indoor antenna and leaky feeders. According to the coverage plan, Finavia chose Creowave to deliver TETRA indoor coverage to Oulu airport in October The agreement included two TETRA Channel Selective Highpower Repeaters and one TETRA Channel Selective and all the antennas, cables, leaky feeders, switches etc. needed for the installation. Creowave provided the TETRA network coverage to the airport as a turn-key solution also completing the installations. The repeaters were delivered and installed to the airport according to the plan and the end measurements performed in early March End measurements were performed with Cassidian THR9i terminal and portable spectrum analyser. The whole airport was walked through and measured, no signal level in the buildings lower than -75 db was found. In the site-survey the weakest signal strengths were measured from the air-traffic control tower basement. Now also there the signal level was measured to be as good as -65 dbm. Overall the average field strength at the airport is now -70 dbm, which is 5 dbm s better than the original target. The target was achieved as planned. Profound Site-Survey and Coverage Planning were keys to success, now both the employees and travellers can feel safe in the Oulu Airport. TETRA Network for authority use is working excellent in every corner. Taisto Soikkeli, Technical Director, Creowave Oy. 15

16 Building TETRA coverage into energy production tunnels Modern metropolitan cities are filled with underground tunnels which must have broadcasting services for personal and emergency communications. As far as emergency communications are concerned, TETRA is the leading technology in Asia and Europe. The capital of Finland, the city of Helsinki, is not an exception when it comes to a huge variety of underground tunnels in the city. One of these tunnel networks belongs to Helsingin Energia, one of the largest energy production companies in Finland. In 2009 Helsingin Energia started a project to enhance TETRA network coverage inside a service tunnel in the area of Helsinki. The service tunnel includes e.g. district heating pipes. The tunnel is used by personnel of Helsingin Energia as well as various service men. In order to be able to communicate in the kilometers long underground tunnels an adequate TETRA network coverage needs to be assured. - We have many kilometers long underground tunnels under the city of Helsinki. For example the district heat pipes are distributed in the tunnels as well as the network of water supply. In these locations the personnel works regularly. Already the tunnel itself creates a challenging working environment and in addition to that, the district heat network can cause threatening situations if there occur a leak in the pipe or valve. That way a load of hot water and steam gets to the tunnels. In these situations it is important the communication works. The HelenNet TETRA network is built to every tunnel of Helsingin Energia to assure the safety as well as to help the communication of personnel in their everyday work, comments Markus Weiström, who is responsible for the maintenance and installations of the TETRA network. Helsingin Energia chose Creowave, a Finnish high-tech company specialized in RF 16

17 TETRA Digital Repeater installed to the tunnel. Installation sites. The floor plan of the Oulu Airport. & Microwave solutions, to build the TETRA network coverage into the tunnels. Creowave has experience in providing solutions to enhance the TETRA network coverage. Company s business area of Professional Radio offers a variety of TETRA repeaters that allow a cost-effective enhancement of the network. As mentioned, after the quarrying of the tunnels, the tunnels were lacking TETRA network coverage. Only few driving ramps and the service clefts had an adequate coverage from the 16 base stations surrounding the tunnels. The TETRA coverage was needed to whole tunnel and also to the clefts. TETRA network coverage for the tunnels was built using Creowaves TETRA Repeaters. The network coverage was planned to build to a redundant status which means that e.g. power breakdown or breakdown of one base station does not compromise the entire radio coverage.this would only lead to degrading of coverage locally and not destroy the whole TET- RA network coverage in the tunnels. The coverage for the tunnels was built using Creowave repeaters. An optimal solution for this specific case was planned the best, reasonable and cost-effective solution for this case was to enhance the coverage with five Creowave repeaters, leaky feeders and antennas. The tunnels required 5 repeaters 3 Band Selective Repeaters and 2 Digital Repeaters. In addition to these repeaters leaky feeders were used. The leaky feeders are a perfect choice for tunnels because in addition to the TETRA signal also GSM signal can be carried in it. The redundant nature of the network structure defines the positions of the repeaters so that there has to be a repeater on the edges of the coverage area. Because of the quite complex structure of the tunnels there has to be 4 edge repeaters. 17

18 Figure 1. Downlink power spectrum in installation site 3 when the Digital Repeater is in band selective mode, the standard 1 MHz filter is used. Figure 2. Downlink power spectrum in installation site 3 when the Digital Repeater is in channel selective mode. The standard 25 khz filter is used to filter unwanted signals. These edge repeaters feed just one leaky feeder to one direction. In addition to the edge repeaters also one repeater is needed for the middle of the coverage area. This repeater feed several, usually two feeders heading to different directions. In order to provide coverage also in the service clefts that rise upward from the tunnel, several couplers were used. Couplers steal a small amount of the repeater power and with an antenna the signal is carried to the clefts. to split the signal into two different directions. The five repeaters were installed in five different installation sites. Typically the sites were service clefts, enabling easy access for service and maintenance. In three of five installation sites a good separation between base stations was achieved using directive antennas. This enabled the use of Band Selective Repeater, the most cost-effective repeater type. Two other installation sites were more challenging. In installation site 3 two strong base station signals were discovered. These are the same signals that are present in installation site 2. These unwanted signals cannot be separated using reasonable sized directional antenna and acceptable height mast. Similarly the site 4 base station signals are strong in installation site 5. Additionally, the unwanted base station signals were very close in frequency to the wanted signal, making the use of channel selective repeater mandatory. In installation site 3, the frequency separation was as small as 50 khz. For these reasons, the Creowave Digital Repeater was chosen for these locations. Due to its filtering challenges the installation site 3 solution is investigated here in detail. As mentioned above, the frequency separation between wanted and unwanted signals was as small as 50 khz. Figures 1 to 4 present the downlink direction power spectrum, measured from the repeater port, normally connected to leaky feeder network. Figure 1 presents the spectrum, when the Digital Repeater is used in band selective mode (1 MHz band width). The wanted channels are M1 and M2. All the other signals are unwanted signals, mainly from several surrounding TETRA base stations. In particular, the strong M3 and M4 channels are the unwanted ones, as they are distributed in the tunnels by installation site 2 repeater. The Digital Repeater is equipped with standard set of filters. This set of filters is optimized 18

19 Figure 3. Downlink spectrum in installation site 3 when the Digital Repeater is in channel selective mode. The custom ultra-narrow 25 khz filter is used to filter basically all unwanted signals. Figure 4. Downlink spectrum in installation site 3 when the Digital Repeater is in channel selective mode, and when the network is loaded using several calls. The custom ultra-narrow 25 khz filter is used to filter basically all unwanted signals. optimized for both indoor coverage and tunnel usage. In typical indoor site, multi-floor building, the filters have to have relatively small delay to remove the problems in the overlapping areas where a direct signal from base station and from the repeater confront. In Figure 2 the standard 25 khz filters are applied to both wanted carriers (M1 and M2). The figure demonstrates that despite the relatively narrow filters, the unwanted carrier M3 close to carrier M2 is still very strong relative to wanted carrier M1. When building tunnel coverage, however, the small filter delay of standard filters is of less importance due to the isolated structure of the underground tunnel where a direct signal from base station does not penetrate into the tunnel. Due to this, custom filtering with additional notches on M3 and M4 was designed for this application. Application of this filter results in very clean power spectrum (Figure 3), all the interfering signals and TETRA channels are separated by more than 30 db relative to wanted base station channel M1. Finally Figure 4 presents the situation, when several handheld TETRA terminals are used inside the service tunnel. Both wanted TETRA signals M1 and M2 are present, while all the interfering signals are absent. Enhancing the TETRA network coverage in the service tunnels of Helsingin Energia has proceeded as planned. Four repeaters of five are now installed and the final one will be installed when the tunnel is finished in the autumn According to the measurements operated in April 2010, the coverage for the finished areas is accomplished according to plan and the customer is satisfied with the results. The workers of Helsingin Energia and also other service men are now able to communicate in underground tunnels, in the challenging environment. During the tests made in April 2010 we discovered that the coverage enhancement solutions provided by Creowave have succeeded as planned. Markus Weiström, Helsingin Energia. 19

20 Building TETRA coverage in a metro depot in the middle of Helsinki city Creowave enhanced the TETRA network coverage in a large metro depot right in the middle of Helsinki city, the capital of Finland. HKL is responsible for running the trams and the metro as well as construction and maintenance of the tracks, stations and depots in the Helsinki region. HKL employs over 1,000 public transport professionals who drive trams and metro trains, control traffic, maintain equipment, tracks and property, plan and implement new projects or perform other managerial tasks. HKL s most important partner is Helsinki Region Transport (HSL) which is responsible for public transport planning, commissioning, passenger information and ticket inspection. Modern metropolitan cities are built with large public transport networks to keep the city and its citizens moving. As far as emergency communications are concerned, TETRA is the leading technology in Asia and Europe. The Finnish authorities use VIRVE network which is the oldest nation-wide TETRA network in the world. & Microwave solutions, to build the TETRA network coverage into the tunnels. In spring 2011 HKL contacted Creowave s partner Bandercom Oy with the need to enhance the coverage at a metro depot close to Helsinki city central. The surrounding is very challenging for the TETRA coverage since the metro depot is a huge metal hall and several metallic / aluminium metro trains will fill up the hall completely from time to time. At the starting point the signals level and quality at the depot were poor and there were areas that had no coverage at all. Customer s main goal for the project was to get the coverage inside the metro depot so strong, that the coverage would work even when the depot is full of trains. With length of 283m and width of 180m the storage hall itself is an area of over 25000m² in need 20

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