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BTS Signal Extension over Fiber: Application Note
Challenge: To provide superb coverage for VIP customers inside buildings
In congested, densely populated urban areas, operators use repeaters to provide better coverage to
customers. The downside of these Off-Air Repeaters is a lot of network interference during normal
usage. Users suffer from unreliable indoor cellular coverage, such as:
Poor calling quality
Call interference in the top floors of high-rise buildings
Poor reception in basements and underground parking areas
Slow Internet service (Throughput ─ MBps)
Dropped and missed calls
Intermittent lack of service
As competition increases, operators must deliver better coverage, while meeting increasing capacity
demands. Moreover, the need for improved bandwidth quality with minimal interference is crucial to
providing fast Internet connection and high throughput.
The Operators’ goal is to retain and increase their customer base, while decreasing costs on coverage
solutions, equipment and real-estate inside buildings. The use of repeater solutions results in a waste
of network resources.
Introducing Foxcom’s BTS Xtend Solution
Foxcom’s BTS Xtend solution, which is based on Foxcom’s In-Building wireless technology, specifically addresses coverage needs for important VIP users on targeted floors or blocks of floors.
Maintaining high quality service for preferred customers, results in a reduced customer churn rate to
the competition. In addition, the BTS Xtend solution uses minimum network resources.
In this configuration, a Base Transceiver Station Site (BTS site), which is centralized at one indoor or
outdoor location, serves multiple sites via pre-existing, underground fiber-optic infrastructure. Remote
Units (RUs) and antennas for a single operator are installed throughout locations, such as high-rise
buildings, basements and underground parking areas.
The BTS and each RU are connected by a single fiber. All cellular operator bands supported by this high
density solution are contained in one Remote Unit, including 2G (cellular, PCS/DCS), 3G (UMTS/AWS)
and 4G (LTE and LTE MIMO). The basic BTS Xtend system configuration consists of 4 cellular bands.
Confidential Information Foxcom BTS Xtend Application Note V1 2
BTS Xtend replaces the current repeater solution, which receives and transmits off-air signals that
cause a lot of interference.
DAS Capacity Comparison
Subject Repeater Xtend Solution
BTS DAS Passive Active
Site Coverage Performance
Poor in dense
areas. Repeater receives signal from multiple sites
Excellent Direct connection to BTS
Moderate Direct connection to BTS
Excellent Direct connection to BTS
Capacity Low (Limited) High (1 sector) High High
Coverage 1 room – a few floors
A few floors Full building Full building and massive venues
System Configuration
Repeater per technology (2G, 3G, 4G)
One system for multiple technologies, multiple services
One system for multiple technologies, multiple services
Equipment Costs
Low cost per band
Low─mid range Mid range High range
Impact on Cellular Network
Bad for UL
path resulting in high interference and use of network resources
No Impact No interference Direct connection to BTS; minimum network resources required (existing BTSs).
No Impact No interference Direct connection to BTS; BTSs added to cellular network.
Installation (Effort, Time, Cost)
Easy; Short installation
time; Low cost
Easy; Short installation time; Negligible cost Uses existing fiber optic cables between BTS site and each RU.
Moderate; Medium to Long installation time. Costly if not covering the entire building
A transmission line is required.
Service Port Output Power
0.01─ 10W per band
10W composite power per RU 10W─40W BTS output power to all DAS system antennas
10W composite power per RU
Foxcom’s active solution offers the most cost-effective, superb, high-capacity
coverage solution for targeted spots.
Confidential Information Foxcom BTS Xtend Application Note V1 3
System Architecture
Figure 1 shows the system architecture of the BTS Xtend product. From one BTS location via
underground fiber optic cables up to 8 RUs can be supported providing excellent service to users on the
top floors of high-rise buildings as well as basements of lower buildings.
Figure 1: BTS Xtend Architecture
* The four bands in this diagram are only an example. Different bands, including 4-band and MIMO LTE,
are also available.
RU
RU
RU
Underground
Fiber Optics
RU
RU
RU
RU
RU
Basement
Coverage High-Rise
Building
*
RU
Confidential Information Foxcom BTS Xtend Application Note V1 4
System Diagram
Figure 2: BTS Xtend Site Links to Two Locations
Advantages and Benefits
Real-estate savings
A single BTS located indoors or outdoors can connect to multiple RUs to provide coverage in multiple locations. Acquiring only one location for a BTS is highly cost-effective for a single cellular operator compared to acquiring a number of locations for multiple remote site locations. It is difficult to find available BTS sites in urban areas. In addition, the construction of an indoor BTS site (at each remote site) using traditional BTS installation methods and operating costs of multiple-BTS sites can be very expensive. BTS Xtend, which uses existing BTS real-estate and pre-existing underground fiber infrastructure, significantly saves on expenses.
Base Station savings
Today, each operator must provide services to end-users using multiple technologies, such as GSM900, UMTS900, GSM1800, LTE1800, UMTS2100 and LTE2600. Using the legacy method (without BTS Xtend), a BTS (or BTSs) supporting all technologies must be installed at each remote site. Each BTS requires a license and transmission connection, which costs a lot of money for the cellular operator, resulting in high operation costs.
Single Operator
Location B
Location A
Operator 1 Band 1
Compact Base
Unit
(CBU)
Remote
Unit (RU)
Operator 1 Band 2
Operator 1 Band 3
Operator 1 Band 4
Remote
Unit (RU)
Remote Unit
No. 1
Remote Unit
No. 2
Remote Unit
No. 3
BTS Site
Confidential Information Foxcom BTS Xtend Application Note V1 5
Using Foxcom’s Xtend solution requires only one BTS for up to 8 remote sites. The result is substantial savings of:
CAPEX: The initial cost of the BTSs as well as installation and commissioning of the BTSs at each remote site
OPEX: BTS license and transmission line payment
Scalability (Capacity / Traffic)
Foxcom’s system can be easily upgraded to support additional users (capacity) at a single location. Moreover, switching from mini-BTS to macro-BTS in the BTS site is relatively easy and low-cost when done at one location.
The scalability advantage is important to operators in the “customer acquisition” phase. However, even after the acquisition phase, the ability to balance traffic from location A to B to support increased capacity is very important.
Future proof
The cellular arena is changing all the time. New technologies appear faster than in any other arena. Therefore, the flexibility of concentrating cellular equipment, like BTSs and backhaul lines, in one location (BTS site) is a great advantage for upgrading.
Transmission line savings (local aggregation)
Foxcom’s solution only requires transmission lines in the BTS site. Saving transmission lines for all remote sites can result in substantial savings for the MNOs.
Aggregation of transmission lines in the BTS site can be utilized, resulting in additional savings on Operational Expenditures (OPEX).
For example: If 5 BTSs are installed in the BTS site, not all 5 lines are used 100% of the time. Therefore, an operator can use only 2 transmissions lines to aggregate the traffic from the 5 BTSs.
Reduced maintenance and operation costs
Maintenance and operation of each site costs money. By using compact equipment, such as Foxcom Xtend at each remote site, operation costs will be reduced dramatically.
Flexible site location
The distance between the BTS site and the Remote Site is calculated according to optical loss. The maximum optical loss supported by Foxcom’s system is 5dBo, which is equivalent to 15Km. This substantial distance affords great flexibility to the acquisitions department when selecting locations for remote sites and greater freedom to connect a lot of nearby locations to one BTS. Moreover, the compact size of the equipment makes site acquisition easier, resulting in better antenna location in urban areas. -----------------------------------------------------------------------------------------------------------------------------------
Israel Corporate HQ, 16 Hataasia Street, Har Tov A Ind. Zone, Beit Shemesh 99052. Tel: +972-2-589-9888 Fax: +972-2-589-9898 [email protected]
US Sales Office, 222 Prince George Street, Suite 110, Annapolis, MD 21401. Tel: 1-609-514-1800 Fax: 609-514-1881 www.foxcom.com
All specifications are subject to change without notice. Rev 1 Mar 2014.