October 2012 - Teletimes

equipment (PASOLINK productline) as well as securitysolutions, such as ePassport,fingerprint recognition/identification solutions, LCDDisplay solutions, etc. We willcontinue to expand our CarrierInfrastructure business in allareas of Asia, Africa and MiddleEast.TT: What edge does NEC’senjoys as a leading high qualitysmart phone manufacturer atthe same time being a mobilenetwork solution provider?KM: NEC is one of the uniquecompanies in the worldwho has both substantial ITServices business (includingsmart phone, PCs, ISP businessand various business) andenterprise IT solutions, aswell as Carrier NetworkInfrastructure business. Thisallows us to provide cloudbased services catered forcarriers to take advantageof their assets to offerdifferentiated services.TT: What role can WiFiplay to supplement 3G / 4Gtechnologies for mobilebroadband?KM: In order to accommodateexpected growth of mobiledata traffic, LTE access networkThe obvious advantage ofservices which can be realizedby M2M communication is itsability to collect various real timesensor data which can be usedfor control and management.capacity alone may not beenough. Utilizing existing WiFiaccess network to relieve trafficcongestion for 3G networkis widely used today and weexpect that this will continueeven after LTE deployment.This is mainly because of thespectrum availability constraintas well as relieving unnecessarybottleneck at the backhaulnetwork and/or packet corenetwork.Other offloading schemeutilizing whitespace may alsobe used in addition to theexisting WiFi.TT: What are the key technicalaspects to be considered whilerolling out a reliable and fastmobile broadband network?KM: When deploying SmallCells (or HetNet) in LTE,following technical issuesmust be properly addressedand have suitable solutions toachieve the desired capacityand Quality of Service:Mobility managementWithout proper mobilitymanagement scheme in place,fast moving device may attachto a small cell and generatefrequent and unnecessaryhandover. Such device shouldutilize Macro cells for betterQoS.Interference mitigationIn addition to the usualInterference mitigation foradjacent cells, interferencewith Macro cell must also beconsidered and dealt with.Load balancingIn order to maximize networkcapacity, proper load balancingbetween Macro cell and smallcells must be maintained.Self Organizing Network (SON)to automate resolving abovementioned issues are specifiedin 3GPP Specifications. 3GPP,however, does not specify algorithmof these functionality.The performance, therefore,is implementation dependent.NEC has focused ourR&D activities to develop highperformance SON algorithmsincluding Small Cell/HetNetenvironment to provide highperformance radio access networkefficiently, quickly, andeconomically.In addition to the above, multivendorinteroperability (betweenMacro cell vendor andSmall Cell vendor) must also beassured to maximize flexibilityfor the Operators.October 2012www.teletimesinternational.com25