Chapter 4 Simulation Result
4.2 Mix traffic Service
4.2.2 AMC usage and throughput for different relay station number
At this section, we will check the relation between the relay station number and the system performance. In Figure 4-19, Figure 4-20, Figure 4-21 were show the three different number of relay station (the relay station number is 3, 6, 9) for system throughput. In Figure 4-22 (Total throughput), Figure 4-23 (HTTP throughput), Figure 4-24 (FTP throughput), Figure 4-25 (VoIP throughput) were show the individual result at the number of 3, 6 and 9 relay stations. In Figure 4-26, the VoIP packet drop rate of mix traffic at the 3, 6 and 9 relay stations.
We will find when the relay station numbers were increase, the system throughput will decrease. Here have two reasons, first is the effective bandwidth was decrease, it reduce the effective resource unit per relay station. The formula is:
Effective bandwidth = System bandwidth (10MHz) / Relay station number (4-3) The second is the base station did not prepare the relation directional antenna to every relay station, so the transmission efficiency will not good, although the link between BS and RS is LOS.
Figure 4-19 Throughputs of mix traffic at 3 relay stations
Figure 4-20 Throughputs of mix traffic at 6 relay stations
Figure 4-21 Throughputs of mix traffic at 9 relay stations
Figure 4-22 System throughputs of mix traffic at 3, 6 and 9 relay stations
Figure 4-23 HTTP throughputs of mix traffic at 3, 6 and 9 relay stations
Figure 4-24 FTP throughputs of mix traffic at 3, 6 and 9 relay stations
Figure 4-25 VoIP throughputs of mix traffic at 3, 6 and 9 relay stations
Figure 4-26 VoIP Packet drop rate of mix traffic at 3, 6 and 9 relay stations
In the simulation result, the amount of relay station numbers will not be affects the link quality between BS to MS and BS to RS. Therefore, we only show Figure 4-27 (3 relay stations) represented the base station to the whole system, Figure 4-28 (9 relay stations) represented the link between the base station to the relay stations. It can be seen that burst profile BPSK is barely appear. That is because the interference is not serious in BS to RS.
Figure 4-27 Base station AMC usage of mix traffic at 3 relay stations
Figure 4-28 Base station to relay station AMC usage of mix traffic at 9 relay stations
CHAPTER 5
CONCLUSION AND FUTURE WORK
In this thesis, our contributions are (1) The Mobile Multihop Relay(MMR) system level platform establishment for supporting MAC layer with basic resource management in IEEE 802.16j draft standard and (2) The performance study of IEEE 802.16j system.
This platform is used for preliminary understanding of IEEE 802.16j system. In this simulator, we focus on studying the overall and complete downlink performance and investigating the advantages and disadvantages of different environment factor like the distance, frequency reuse factor and the number of relay station. The applied scheduling algorithm is the Early Deadline First (EDF). Secondly, real time service and mix traffic service performance is studied. After that, real time service performance with regarding to different environment factor is investigated. From these performance simulations, the conclusions are described as below: For real time service, the distance and frequency reuse factor will influence the throughput and packet drop rate. The shorter cell radius can provide better transmit environment. The frequency reuse factor will decide the interference level and the effective bandwidth.
The relay station number will also effect the effective transmit bandwidth and interference level. After simulating, we find the transparent relay station may not be the perfect. Transparent relay station means it can do the throughput enhancement.
We think the actuality meaning which helps the worst case user to improve the service quality like the BPSK user upgrade to the QPSK or other AMC, but everything is not ideal. The transparent relay station will have something done at the expense. The effective resource units were consumption on the resource segment. This will let the total system throughput degrade.
Hence, in future work, we need to let the more smart mechanism in transparent relay station. We need let the base station can partial control the relay zone, if the relay zone will not fully utilize. We did not setup enough corresponding coding rate, so in the future we need to set up whole coding rate to make up more diversified in our platform. We need to setup the relation directional antenna technical to provide every relay station have the better radio frequency (RF) condition, like the beamforming.
With beamforming, the co-channel interference is reduced and SINR is enhanced so that the transmission quality will be promoted. Besides, the relay station setup in the cell edge will improve the poor RF, but this situation needs to consider the interference in the neighbor cell. In the future, the research in the non- transparent
relay station will have more benefit. However, it is more complicated then transparent relay station. The trade-off shall be taken into consideration.
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