Progress Report of NTT DOCOMO LTE Trials January 26, 2009 Takehiro Nakamura NTT DOCOMO

Transcription

1 ATIS-3GPP LTE Conference January 26, 2009 Progress Report of NTT DOCOMO LTE Trials January 26, 2009 NTT DOCOMO

2 LTE History and Status in 3GPP Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Study Item TSG meetings Work Item Dec Study Item on Evolved UTRA and UTRAN was proposed by 26 companies and approved. June 2006 The detailed specification work (Work Item) started. Sep-Dec Major core specifications were approved. were approved. Test specifications were approved. Work Items were closed Concept of of Super Super 3G 3G was was proposed. January 26, 2009 DOCOMO started All All LTE LTE specifications specifications have have been been development of approved. of approved. LTE LTE (Super (Super 3G) Rapid 3G) Rapid progress progress in in development development by system by vendors vendorsis is creating creating market market momentum. momentum. Copyright 2008 NTT DOCOMO, INC. All rights reserved

3 Copyright 2008 NTT DOCOMO, INC. All rights reserved Overall LTE Time Plan of NTT DOCOMO GPP Standardisation System Development SI RFP WI phase Core spec Test spec Experimental System Commercial System development Indoor/Field Experiments & Demo Development Target date of development completion: By the end of 2009 Commercial Deployment DOCOMO started development of LTE system in DOCOMO began LTE trials and demo from July 2007.

4 NTT DOCOMO LTE Trials

5 LTE Experiment System Servers (FTP, Streaming, SIP) high information rate, high quality video transmission VoIP high quality video conference FTP Client Interactive game Mobile Station Base Station VoIP high quality video conference Core Network Simulator Interactive game Multimedia Broadcast (MBMS) Mobile Station Radio Propagation Channels Base Station

6 Major Parameters of the LTE experimental system Aligned with 3GPP LTE specifications Bandwidth Access scheme Duplex Sub-carrier spacing DL UL Guard interval (CP length) Sub-frame length Modulation Multi-Antenna technique for DL Peak data rate DL UL DL UL 5, 10, 20MHz OFDMA SC-FDMA FDD 15kHz 4.7usec 1msec QPSK, 16QAM, 64QAM QPSK, 16QAM 1x2, 2x2 MIMO, 4x4 MIMO ~ 300 Mbps ~ 50 Mbps

7 NTT DOCOMO Field Experiments Field experiments have been conducted in 3 cities in Japan to confirm LTE practical performance in variety of environments Sapporo, Hokkaido Started in October, 2008 A single site, 2 sectors Urban environment Kofu, Yamanashi Started in August, sites, 6 sectors/site Suburban environment Yokosuka, Kanagawa Started in February, sites, 2sectors/site Rural environment

8 Copyright 2008 NTT DOCOMO, INC. All rights reserved Field Trial in Yokosuka Sector 1 4 Tx/ 2Rx 2 sectors BS#1 (DoCoMo R&D Centre) 500m Sector 2 Sector 2 BS1 NTT DOCOMO R&D center Sector 1 BS2 250m 500m Measurement course

9 Downlink Peak Throughput in The Field Trial Peak throughput about 250Mbps is achieved!!!

10 High-Definition Video Streaming 6 High-definition video streaming Total throughput of around 80 Mbps

11 Round Trip Delay UE enode B CN simulator Server Ping

12 Bidirectional HD Video and Gaming Gaming at the BS side HD video camera at BS side HD video shows gaming in the experimental car Gaming CN simulator enode B UE Gaming Bi-directional HD video January 26, 2009 Bi-directional HD video

13 Inter-eNodeB enodeb Handover 500m Stable and loss-less HO was achieved Sector 2 BS#1 250m DOCOMO R&D Centre Sector 1 BS#2 January 26, 2009

14 Throughput distribution at the measurement course in Yokosuka BS (Mbp

15 Measurement Course in Yokosuka enb DOCOMO R&D center 250m enb antenna height: app. 40 m UE antenna height: app. 3.2 m Mobility speed: ave.30 km/h a 500m c b Received power (dbµv) Received power (dbµv) Received power (dbµv) Point a Delay (µsec) Point b Delay (µsec) Point c Delay (µsec) Measurement course Distance from enb antenna: app. 400~700 m Radio propagation env.: NLOS

16 DL Throughput Fructuations January 26, 2009 Throughput (Mbps) Measured received SINR per antenna (db) Time (sec) Time (sec) Point a Point b Point c Throughput fluctuations depend on SINR fluctuations At point a (400 m from enb antenna), more than 200 Mbps achieved At point b, throughput degrades due to low SINR

17 Cumulative distribution of DL Throughputs in test course Peak data rate exceed 250Mbps More than 100Mbps is achieved over 90% area in measured course CDF 0.4 More than 150Mbps is achieved around 50% area in measured course Throughput (Mbps)

18 DL Throughput Performance Throughput (Mbps) Field Lab. SIMO 2x2 MIMO 4x4 MIMO N RB = 88 Field trial results are worse than those of lab test by several db due to antenna correlation 4x4 MIMO outperform 2x2 MIMO or SIMO significantly 2x2 MIMO outperform SIMO under high SINR environment Measured received SINR per antenna (db)

19 More Detailed Results of LTE Trials Y. Ofuji, et al., Experimental Results of E-UTRA Downlink with Variable RB Allocation, IEEE VTC 2008-Fall, Sep N. Okubo, et al., Experimental Results of E-UTRA Uplink with Variable RB Allocation, IEEE VTC 2008-Fall, Sep Y. Ofuji, et al., Experimental results on 4x4 MIMO precoding in E- UTRA, The 14 th Asia-Pacific Conference on Communications (APCC) 2008, Oct Y. Ofuji, et al., Field Experimental Results of E-UTRA Downlink with Precoding and Non-Precoding MIMO, IEEE VTC 2009-spring, to be submitted. H. Takahashi, et al., Field Experimental Results on E-UTRA Downlink Throughput Using Polarization Diversity Antennas, IEEE VTC 2009-spring, to be submitted.

20 NTT DOCOMO LTE Deployment

21 Status toward LTE introduction in Japan Introduction of 3.9G mobile communications system has been studied in telecommunications council in Japan since April 2008 In the council, LTE was proposed as one of 3.9G system to be studied As the study results, feasibility of LTE was confirmed in terms of meeting requirements of 3.9G and coexistence with existing radio systems Four cellular operators in Japan, including DOCOMO, declared to introduce LTE as the 3.9G system within several years NTT DOCOMO declared to launch LTE in 2010 as one of the leading companies of LTE in the world

22 Overall LTE Time Plan of DOCOMO (Assumption with current 3GPP work plan) GPP Standardisation System Development Experimental System SI RFP WI phase Core spec approval development Indoor/Field Experiments & Demo Core spec freezing Commercial System Development Target date of development completion: By the end of 2009 Commercial Deployment DoCoMo aims to complete the technology development before the end of DOCOMO aims to complete the technology development before the end of To ensure the roaming/interoperability, we will watch the global status carefully and make a concrete plan. January 26, 2009 Copyright 2008 NTT DOCOMO, INC. All rights reserved

23 DOCOMO s Views on LTE Spectrum Deployment Scenarios At the LTE launch, 2GHz spectrum band will be used because of the global spectrum band and utilization of existing NW facilities, e.g. antenna LTE spectrum can be increased in the future according to wide spread of LTE terminals and new spectrum band allocation 3G spectrum Spectrum examples LTE 3G Efficient use of 3G spectrum over long time 2G spectrum PDC s 2020s

24 DOCOMO s Views on LTE System Deployment Scenarios 2G UE PDC At the initial stage of LTE, Overlaid with 3G coverage 3G and LTE dual mode terminal Focus on PS services CS services can be provided in the 3G cells Reuse of existing BS site for low cost deployment According to the wide-spread of the LTE terminals, LTE coverage will be expanded CS services can be provided in LTE on PS domain 3G terminal LTE terminal PS services LTE 3G(R99) 3G No (HSPA) CS&PS CS&PS services access services over packet NW s 2020s 4G LTE/4G terminal Simple NW for all services LTE/4G terminal

25 Core Network Evolution Core Network will also evolve toward ALL-IP in parallel with RAN s evolution. IP-based CS CS services offered via IMS LTE/4G support Interworking among 3G, LTE and 4G IP-based RAN

26 Conclusions LTE Trials NTT DOCOMO conducted LTE indoor and field trials from July 2007 and February 2008, respectively. Field trials are conducted in 3 cities in Japan to confirm practical LTE performance under variety of environment The trial results shows satisfying high performance of LTE in terms of delay, throughput and stability NTT DOCOMO s views on LTE deployment NTT DOCOMO will launch LTE in 2010 as one of the leading companies of LTE in the world LTE service area will be overlaid with 3G service area and LTE/3G dual mode terminal will be introduced in order to deploy seamless service area from the beginning of LTE launch 2 GHz spectrum band will be used for LTE launch considering utilization of existing NW facilities and global roaming LTE spectrum can be increased in the future according to wide spread of LTE terminals and new spectrum band allocation

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