http://wm.tongji.edu.cn future broadband wireless communication mobility testing platform ph.d,...
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http://WM.tongji.edu.cn
Future Broadband Wireless Communication Mobility Testing
PlatformPh.D, Prof. Fuqiang Liu, Xuefeng Yin
Broadband Wireless Communication and Multimedia Institute
Embedded System and Computing-service Lab , Ministry of EducationSchool of Electronics and Information Engineering
Tongji Universityhttp://wm.tongji.edu.cn
http://WM.tongji.edu.cn
Tongji University’s CampusesTongji University’s Campuses
Siping Campus
Anting Campus
Anting auto
town;
Auto Electronics
Shanghai
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Outline• Broadband Wireless Testbed(WiMAX/4G)
– 4G Testbed Shanghai Platform
– Tongji’s work in 4G
– Vehicle Broadband Wireless Research and simulation
– Testing Platform
• Channel Emulation for Mobility Testing
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临空经济园区建筑物分布图 临空经济园区分布式组网小区规划图 临空测量站址示意图
Testbed design(Shanghai)
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OPNET simulation platform
Test method and suite design
GSM, WCDMA, TD-SCDMA, WIMAX, LTE
AM,FM,PM,ASK,FSK,PSK,QAM
System performance analyzer
Transportation Report
MeshRelayDistributed
Link level Simulation
Services Presentation
基于Multi carrier、MIMO、RoF等基本技术的分布式外场试验环境
Parameter & Environment Config
Network Deployment
Network performance report
Service Features Service flow model
Services Data Collection
Integrated service transportation performance Report
interface
DT DeviceAir Interface test
Multi-channel test
Wave Propagation test
Wireless QoS Test
Hybrid Services Concurrent Test
Outfield verification
system
G bit Transportation test
PXI Controller
Test Executive Manage Policy
Wireless Test Tools
Spectrum Test Tools
LabView
digitizer
Modulation tools
More test module
vector signal generatorchannel
simulatorspectrum analyzer
接口
Integrated test bed
应用层传输层
网络层
网络接口层
Framework of Shanghai 4GTest
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• Base on the characters of the project, the indicators of the networking test should focus on the performance evaluation of the system.
Tongji’s work in 4Gtest
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DEMO__MIMO based wireless network evaluation system demonstration
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Networking Testbed Architecture
Channel Testbed
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Features of DSRC• Dedicate short rang communications (DSRC) ,IEEE802.11p• 75 MHz of band available in U.S.
– Twice the bandwidth of cellular – Approved by FCC– Primary allocation– Allocation incentive was safety
• Range: Up to 1000 meters • Data Rate: Up to 27 Mbps
– Tolling will probably use default data rate of 6 Mbps
• Mobile connection: up to 120 mph• High Availability & Low Latency (50ms) Prioritization
Service
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Service-Oriented Research
• Safety: improving driving safety and/or traffic efficiency • Non-safety: providing information and/or entertainment to the driver
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Hybrid FrameworkVehicle Broadband Wireless Network Research (funded by National High-tech Research and Development Program (863 Project))
Transport Network
C2C Link
Mobile Relay AP
network infrastructure
Access
BUS
DSRC
CAR CARSS1SS3
SS2
Fixed AP, Local Control
Module
CAR
Internet
Intelligent Traffic Control
Center
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Research Topics
• Realistic mobility model
• Multi-channel Coordination
• Mobility prediction
• Data dissemination
• Cluster-Based Routing Protocol Power
• Power Control
• Session Maintenance Maneuver
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Realistic mobility modelTraffic flow characteristics
-Vehicles speed range -Lanes number
-Vehicles density -Lane changing features
-Traffic regulation
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Multi-Channel Operation
North America FCC 1999 DSRC: 172-184, 7 channels
Channel Coordination Channel Assignment
Non SafetyApp.DATA
CCH Interval (50ms) SCH Interval (50ms)
CCH
SCH
UTC SecondSynchronization Interval (100ms)
WSA: WAVE Service Advertisement
Guard Interval
WSA
Backoff slots
AIFS SIFS
WSA
SafetyApp.
SafetyApp.
AIFSDIFS
WSA
Backoff slots
Guard Interval
RTS
CTS
Backoff slots
ACK
SIFS
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Mobility Prediction
Mobility prediction
Nodes can rebuild new routes by sensing its neighbours' movements
unnecessary prediction (<200):
A->C1 、 C2 、 C3
safe transmission (200<R<240):
A->C4
change route (240<R<250):
A->D->Cn
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Cluster-Based Routing Protocol
• Intra cluster : emergency messages, etc. • Inter cluster : non-emergency and long-distance messages, etc.
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Simulation Scenario
AP
RSSS
V1
V2V3 flow1
flow2
flow3
flow3
flow4
flow4
DSRC Simulation in NS2
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Testing Platform Scene
宽带无线通信与多媒体实验室
同济大学电子与信息工程学院大楼
①
②
③④
⑤
⑥
⑦
⑧
⑨
ⅡⅠ
①② 无线RSU
③ 交换机
④ 视频服务器
⑤⑥ CCD摄像头
⑦⑧⑨ 车辆 (配有车载终端)
Ⅰ RSU①覆盖区域
Ⅱ RSU②覆盖区域
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DEMO__DSRC
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Outline• Broadband Wireless Testbed(WiMAX/4G)
– 4G Testbed Shanghai Platform
– Tongji’s work in 4G
– Vehicle Broadband Wireless Research and simulation
– Testing Platform
• Channel Emulation for Mobility Testing