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MAINTOPIC

FEB 2008.

ISSUE 3817

The fourth generation BTS

n the mid-1990s, the rst generationBS with analog power amplier (PA)enabled people to have un in theirmobile communications. In 2000,

the second generation BS with digitalPA greatly accelerated the development omobile networks. In 2005, the distributedBS, which represents the third generation

BS, brought substantial changes tonetwork construction. With the applicationo the wideband RF and IP technologies,the ourth generation BS has nowbecoming a highlight in the industry, andully displaying its eatures o Convergence,Integration, All-IP and Green.

Convergence

he constant development o mobilecommunications has accelerated theupgrades o technologies and products.GSM networks are heading to the enhancedata rates or GSM evolution (EDGE)and EDGE+, while WCDMA networksare evolving to high-speed packet access(HSPA), HSPA+, and long term evolution(LE). Faced with dierent systemsincluding WiMAX, operators have toinvest much on operation and maintenancei dierent networks are constructed.Tereore, convergence has become a majorconcern throughout the industry.

he BS accommodating dierentsys t ems deve lops typ ica l ly in twodirections. First is the initial stage, in

wh ic h th e eq uipmen t room , an tenna,eeder and auxiliary equipment are shared,

whil e di er ent networks use di eren ttypes o BS. Second, the sotware denedradio (SDR) technology is adopted to

uniy the hardware o BSs in dierenttechnical systems. As a result, a hardwaremodule can be conigured to support aunique system such as GSM, WCDMAand CDMA, or even support two systemssimultaneously. his can enable smoothupgrades and reduce operation costs,including the cost o service parts.

Integration

Te need or greater capacity has beenincreasing with the drive o high-speeddata services. BSs adopting the multi-carrier technology have higher integrationand lower power consumption, and theycan acilitate smooth capacity expansion.Multi-carrier technology is the currenttrend or radio requency (RF) broadbandusage, and it is a key technology or theourth generation BS.

Multi-carrier technology was irstapplied in 3G BSs. he 2G networkused single-carrier technology in its early

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MAIN TOPIC

phase, but can now use multi-carriertechnology introduced rom 3G networks.In a traditional BS using single-carriertechnology, each carr ier inc ludes a transceiver and a power ampliicationunit. Multi-carrier technology employs

wid eba nd RF te ch nol og ie s, in wh ic hmultiple signals are combined through the

digital intermediate requency (IF) and aretransmitted through a broadband powerampliier. In each multi-carrier module,the number o carriers can be lexiblyconigured and power can be sharedamong carriers. As a result, combinersare no longer needed, enabling lexiblecapacity expansion and reduced powerconsumption.

In a grand expo our months ago inChina, the trafc was estimated 10 timesmore than usual. Te technical guarantee,however, had been proven to be an easyone. With the help o Huaweis ourthgeneration BS equipped with multi-carrier module, the network capacity

was expanded three times through dataconguration in one minute, without theneed o adding new cabinets or rentingnew equipment room.

All-IP

he increase o data service has raised

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Huawei Technologies

FEB 2008.

ISSUE 38 1

Apple gained a whopping success by wining 10% of operators revenue generated from iPhone users, which

raised a heated topic about changes in the value chain. In an industry with stiffer competition, transnational

operators have to fight tooth and claw to get a new market share from their competitors, while regional

operators are striving to grab a larger stage. The industry is undergoing a hurricane, a telecom analyst said.

Higher requirements have been imposed on the existing networks with the introduction of new services,

increased number of users and higher average minutes of usage. Facing decreased ARPU and increased OPEX,operators need a future-oriented wireless network solution to handle these challenges and boost their prots.

ourth generation BS is to reduce resourceslike equipment room and energy. Highly-integrated BSs with low powerconsumption are the key to greencommunications.

he ourth generation BSboasts enhanced eatures in itsintegrity and power consumption.

ake a 12-RX BS o 3 sectors or example. Atraditional BS requires three cabinets and 8000Wpower consumption i air conditioning included.he ourth generation BS, however, needs onlyone cabinet and 2000W power consumption evenin an equipment room with higher temperature. Bycomparison, costs on auxiliary equipment can bereduced by over 30%, while power consumptiono BSs can be saved more than 75%. For anoperator in South Arica, its traditional BSs canconsume energy equaling to USD1.2 billion in ave year period. I all the BSs use Huaweis ourthgeneration ones, a total o USD0.75 billion can besaved.

Te year 2008 will be characterized by networktransormation. An innovative and quick-responsepartner is needed in operators eort to explore theblue ocean. Relying on customer-based innovation,Huawei positions its technical development onGreen, Convergence, Broadband and Evolution.Huawei has taken the lead in releasing the ourthgeneration BS in the industry, and will always be apartner in building a uture-oriented network withoperators.

By Xu Peizhong

Pointing the wind vanes for BTSs

higher requirements or bandwidth. Operators,however, have to ace various challenges in eachbandwidth expansion, such as replacing the existingequipment at a large scale, or making drastic changesin network architecture, especially in transmissionnetwork. High cost has become a curse in openingthe door o broadband.

Te ourth generation BS can solve the above-

mentioned problems. Based on IP and widebandRF technologies, the RF channel can be up to20MB, while transmission interace can support100MB traic. As only data coniguration isneeded to enable the changes between dierentsystems, operators can protect their investmentduring network transormation. For example, a3x4 GSM BS can be conigured to a 3x2 HSPABS. Tis conguration does not require hardwarereplacement, but the transmission speed can beincreased rom 2MB to 20MB.

Huaweis ourth generation BS has gaineda leading position, thanks to the companys richexperience in broadband and IP. In 2006, Huaweisucceeded in deploying an All-IP HSPA networkin Japan, which marks the very irst time that IPtechnology is introduced into mobile networks.

At the end o 2007, Huawei helped an ope ratorestablish its networks in Szechwan, China, using theGSM BSs based on a wideband platorm.

Green

A major drive behind the development o the