1 wm lab, tongji univ. performance evaluation methodology & key technologies of new generation...

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WM Lab, Tongji Univ.

Performance Evaluation Methodology & Key Technologies of New Generation Broadband Wireless Access Networking

Zhiwei Gao

Broadband Wireless Communication and Multimedia Institute

School of Electronics and Information Engineering

Tongji University

http://wm.tongji.edu.cn



Future Wireless Broadband Test Environment

Parameters of Future Wireless Broadband

Wireless Access Sketch Maps

Platform of Wireless Access Scenarios

Simulation of Relay & Distributed Networks

Approach to Real World

Test Methodology

Simulation Platform Associated Application Traffic Test

Combination with Wireless Test Hardware

What Can We Test









Test Methodology



What Can We Test



Framework of Tongji 4G-Test Research




Platform Parameters

Parameter Value

Carrier frequency 2.4 GHz ---- 6GHz

Channel bandwidth 2x50 MHz

Number of cells 7 (center evaluated)

Users per cell 10 (3 One-Hop, 7 2-Hop)

Inter-site deployment 800m, 1000m, 1200m

Distance BS – RN 45% of distance BS-BS

Traffic load 1-54 MBit/s

type of antennas omni

RN /UT number of antenna 1 2 4(MIMO)

BS transmission power 46 dBm

RN transmission power 37 dBm

UT transmission power 24 dBm

Traffic model Full buffer

Retransmissions Yes

Mobility Yes

Resource scheduling Exhaustive Round Robin (ERR)

Multi-Access Method OFDMA

IP Networks Full IP

The parameters used in the simulations of the baseline deployment in wide area test case are illustrated. The NLOS channel model was used for BS-RN links and NLOS for RN-MS links. We designed HARQ for packet retransmissions due to errors. We have assumed all the network nodes are IP-based. Users are considered to have mobility from BS to BS with mip.

Tongji BWA Lab




Backbone networks

Mobile RS

BUS

车载宽带无线接入

SS1

SS3SS2Fixed

RSMS

Relay网络

分布式网络

（433，750）

（866，0）（-866，0）

（-433，750）

（433，-750）（-433，-750）

BTS


Distributed Access1. Transmission Diversity and Receiver Diversity 2. Smart Antenna and two-dimensional space-time signal processing technology3. "Virtual cell" technology4. Distributed receiving station

Relay Access:1. Frame Structure.2. Cooperation and Macro-diversity between Relay Stations.3. Wireless Resource Management.4. Spectrum Allocation Technology.5. Design of ARQ/HARQ.6. Signal Processing mode of Relay Station.









Test Methodology



What Can We Test



Broadband Wireless Access Simulation Platform


In this system, mobile station which is around base station can access base station as one hop, otherwise, mobile station which is far from base station can access base station through multi-hops.

Distributed Access and signal processing are one of methods to enhance communication system capacity and spectrum efficiency of next generation wireless communication.



Approaching to Real WorldIntroducing relief map 、 contour line and modified propagation model when designing scenarios. Eventually come up with an approaching to real world simulation platform.










Test Methodology



What Can We Test



Test Methodology




Test Methodology


Playing in local media server(Left)Playing in the receiver node with packet loss and delay(Right)

From OPNET



Test Methodology


Cooperated with hardware test devices, using the modified propagation model and real data collected by test hardware.









Test Methodology



What Can We Test



Coverage

Capacity

Mobility

Qos

What Can We Test



Coverage Test

Objective：•Validate network planning , and find the blind spot and the empty area of network coverage.

•Compare the coverage of the different service channel to verify the theoretical results.

•Through the test results of the same type of service in different wireless communication environment , verify the impact of the various parameters in the link budget.

A

A

B

B



Objective：• In the actual environment, verifying if the number of largest

access users can reach or close to theoretical value. Test environment includes static and dynamic situations.

• In the test, every test should use the number of the largest users which meet QoS requirements as the determining principle of cell capacity.

Capacity Test



content：• Capacity test can be considered as throughput test. It

includes throughput test of Single-user area and Multi-user area, and can be both mobile and fixed-point test. – a single-user movement test does research on MS loading

operations when moving from BS to marginal areas(Speed:20-40km/h). (radial-forward extrusion coverage)

– Multi-user movement test does research on MS in the near, medium and far distance, with the speed of movement along the loop. (loop coverage)

• Test environment can be divided into work and load conditions in single area and the adjacent areas.– Plot test of Single-user and multi-user area in the adjacent areas

are 50 per cent of the loading conditions in near, medium, far plot under C / I identify. (Near: 10 dB +; medium :5-10 dB; far :0-5 dB.)

Capacity Test



• All IP Based Network;

• Mobile IP Technology;

• Multi-Cell Handover;

• In a Heterogeneous Network(Next Step).

Mobility Test



• QoS test depends on the service types of different networks.

• KPI (Key Performance Indicators) of QoS test include throughput , delay, jitter, BER/FER, etc.

Qos Test



Network Performance Evaluation

Qos Mobility Coverage Capacity

Network PlanningService Planning

Performance Report

1 wm lab, tongji univ. performance evaluation methodology & key technologies of new generation...

Documents

wireless test hardware

test methodology combination

wm lab

hardware test devices

gtest research slide

wireless resource management

tongji bwa lab slide

real world simulation