LTE Outdoor LTE Infrastructure Equipment () 渡辺君夫 町田守 あらまし 3GPPLTE LTE Abstract Fujitsu has developed outdoor LTE infrastructure equipment () based on the specifications in the 3rd Generation Partnership Project (3GPP). Thanks to the use of highly efficient and highly integrated devices, flexible software configuration technology and simple hardware architecture, this LTE infrastructure equipment is small, lightweight and has a low power consumption. This means it can be deployed easily and efficiently when a number of base stations are installed to cope with heavy traffic load in a mobile network. As a result, this equipment helps reduce capital investment and operating costs in our customers networks and it also contributes to the environment. This paper describes an outline of this LTE infrastructure equipment and its features. 394 FUJITSU. 62, 4, p. 394-399 07, 2011
屋外型 LTE 無線基地局装置 () まえがき LTE 図 -1 NTT W-CDMALTE LTE LTE を支える主要技術 LTE3GPP3rd Generation Partnership Project3GPP Release.8 1 LTE 1 LTE/ IP Voice over IP 2 LTE 3 3 LTE OFDMAOrthogonal Frequency Division Multiple Access SC-FDMA Single Carrier-Frequency Division Multiple IP S1 線 S-GW P-GW MME X2 線 S1 線 UE UE 地 地 evolved Node B UE User Equipment MME Mobility Management Entity S-GW Serving Gateway P-GW PDN Gateway -1LTE Fig.1-LTE system. FUJITSU. 62, 4 07, 2011 395
屋外型 LTE 無線基地局装置 () AccessOFDMA CPCycle Prefix SC-FDMAOFDMA CP PAPRPeak to Average Power Ratio 4 LTE QPSKQuadrature Phase Shift Keying16QAM16 Quadrature Amplitude Modulation 64QAM64 Quadrature Amplitude Modulation AMCAdaptive Modulation and CodingAMC -UE 5 LTEMIMOMultiple Input Multiple OutputMIMO 22MIMO2 の特長 1 DPDDigital Pre-Distortion 2 BBUBase Band Unit RRHRemote Radio Head 3 4 5 SONSelf-Organizing Network Energy Savings 装置構成 1 BBU 3 RRHBBURRH CPRICommon Public Radio Interface 2 表 -1 図 -2 1BBU BBU S1 X2 IP RRH RRH IP S1/X2-1 Band4Band9Band17 5 MHz10 MHz15 MHz20 MHz OFDMASC-FDMA 22MIMO 12SIMO 6 60 W30 W30 W 150 Mbps 50 Mbps 1000Base-SX, 1000Base-T 350 km/h BBU20RRH20 396 FUJITSU. 62, 4 07, 2011
屋外型 LTE 無線基地局装置 () 2RRH RRH BBU RFRadio Frequency UEUE RF BBU BBURRH 図 -3 アーキテクチャ -2 1CNT CNTIP OAMOperations, Administration and MaintenanceS1/X2NAT Network Address Translation RRH AMP TRX BBU BB CNT RRH APL RRH CPRI -2 Fig.2- hardware architecture. abbu brrh -3 Fig.3- equipment. FUJITSU. 62, 4 07, 2011 397
屋外型 LTE 無線基地局装置 () CPUFPGAField Programmable Gate Array CNT APL 3GPP Release.8 Cell lockradio admission controlperformance ManagementCell SupervisionCall Trace OAM SON 2BB RLC/PDCP/MAC/PHY LTEMIMO OFDMA SC-FDMA AMC H-ARQ DSPDigital Signal ProcessorFPGA 3GPP 3TRX D/AA/D CPUFPGA 4AMP MMICMonolithic Microwave Integrated CircuitRF 干渉制御とグリーン技術 LTE 1ICICInter-Cell Interference Coordination ICIC ICIC 図 -4ICIC ICIC 2 / / CO 2 ON/OFFEnergy Savings 0 1 0 1-4ICIC Fig.4-ICIC. 398 FUJITSU. 62, 4 07, 2011
屋外型 LTE 無線基地局装置 () -5Energy Savings Fig.5-Energy Savings. OFF/ON Energy Savings 図 -5 むすび LTE 参考文献 1 3GPP TS36.300 V8.12.0 http://www.3gpp.org/ftp/specs/html-info/36300.htm 2 CPRI Specification V4.2 http://www.cpri.info/downloads/ CPRI_v_4_2_2010-09-29.pdf 著者紹介 渡辺君夫 ( わたなべきみお ) LTE 町田守 ( まちだまもる ) LTE FUJITSU. 62, 4 07, 2011 399