1. 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
Mainly focus on Test methodologies and Networking technologies

2. 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
Here is the outline
First is
Second is
The third one
The last one is showing what we can test within our platform

3. 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

4. Framework of Tongji 4G-Test Research
The upper interface in the yellow part is combining with application layer, which generate real application data.
The lower interface is cooperating with phy layer devices such as signal generator and signal analyzer.

5. Future Wireless Broadband Test Environment
Tongji BWA Lab
Platform Parameters
Parameter
Value
Carrier frequency
2.4 GHz GHz
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
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.
Here is the NGWN parameter we work for several years, and conclude these parameters in many years hard work.

6. Future Wireless Broadband Test Environment
Wireless Access Sketch Maps
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.
Distributed Access
1. Transmission Diversity and Receiver Diversity
2. Smart Antenna and two-dimensional space-time signal processing technology
3. "Virtual cell" technology
4. Distributed receiving station
Mainly is relay and distributed network as mentioned by my supervisor this afternoon. The relay network we researched is fixed relay access and a mobile relay access scenarios.
And the distributed network is different from traditional distribution antenna, it’s a distributed cell by using a technology named virtual cell. We simulate it in our platform.

7. 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
Now it’s our platform.

8. Simulation of Relay & Distributed Networks
Broadband Wireless Access Simulation Platform
Simulation of Relay & Distributed Networks
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.
the upper picture shows many two-hops nodes, which can connect with each other by relay node. The router shown here is a access to ip back bone network.
The lower picture shows a virtual cell conception, as we can see , one ms can be served by one or more different BSs simultaneously as the ms go around the center cell. We shown the handover by different color.

9. Approaching to Real World
Platform of Wireless Access Scenarios
Approaching to Real World
Introducing relief map、contour line and modified propagation model when designing scenarios. Eventually come up with an approaching to real world simulation platform.
We get the propagation model/path loss function by testing in real environment, and get the result by computing the data.
And we can have a simulation platform which approaching to real world.

10. 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

11. Test Methodology
Simulation Platform Associated Application Traffic Test
The sender generate real data in a designed traffic model into our platform, the server get the real data and transform it to the ms by the different access technologies, and the ms can move along the white line with a VA speed model.
The ms receive the data and transform it to the test receiver. So we can get the result generated by simulation platform and by analyzing the rel data.

12. Test Methodology
Simulation Platform Associated Application Traffic Test
Playing in local media server(Left)
Playing in the receiver node with packet loss and delay(Right)
Here is a vivid result, which comparison the original data and the result.
The right picture is shown with packet loss and time delay.
From OPNET

13. Test Methodology Combination with Wireless Test Hardware
Cooperated with hardware test devices, using the modified propagation model
and real data collected by test hardware.

14. 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
Now, let’s have a look what can we test in our platform.

15. What Can We Test
Coverage
Capacity
Mobility
Qos

16. 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.

17. Objective： Capacity Test
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.

18. content： Capacity Test
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.)

19. Mobility Test
All IP Based Network;
Mobile IP Technology;
Multi-Cell Handover;
In a Heterogeneous Network(Next Step).

20. Qos 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.

21. Network Performance Evaluation
Qos Mobility
Coverage Capacity
Service Planning
Network Planning
Performance Report

22. Thank you