A Study of Non Real Time Radio Bearer Packet Data Performance in UMTS Radio Access Network Seema Gyanwali Supervisor: Professor Sven Gustav Häggman Instructor: Janos Gyori

2 Master’s thesis seminar presentation Seema Gyanwali Contents Introduction Goals Background Measurement Introduction Measurement Method Results Conclusions

3 Master’s thesis seminar presentation Seema Gyanwali Introduction Knowledge of Packet data transmission in the radio interface of UMTS and factors involved in its transmission is not widely investigated and documented. Packet data performance is a broad concept which can be investigated from different perspectives for different purposes. This thesis studies the radio network parameters’ performance in WCDMA network for visualizing and optimizing packet data transmission. This work will help in the following aspect: Validation of network design Validation of Planning assumptions such as – cell range – maximum acceptable load Dimensioning – Iub capacity, – Node B capacity Performance Optimisation Radio coverage optimization Analysis of radio link power and network tuning Tuning of advanced features e.g. load and service tuning Find out some statistics and the trends for reference purposes This work was done in Nokia Networks, Espoo.

4 Master’s thesis seminar presentation Seema Gyanwali Goals of the Thesis Work The goal of the thesis is to: Conduct a drive test measurement in WCDMA test network Collect the performance data from the drive test Perform statistical analysis on the collected data to verify the packet data performance in different radio conditions Evaluate the throughput and maximum radio link power for different bearer services Analyse the coverage area for different bearer services Scope: Scope of the work is limited to radio interface of WCDMA network only, it is not a study for end to end performance

5 Master’s thesis seminar presentation Seema Gyanwali Background

6 Master’s thesis seminar presentation Seema Gyanwali Network Elements CN MSC/VLR SGSN RNC Node B RNC Node B UTRAN Iu Iub Iur UE USIM Cu Uu ME GMSC GGSN HLR PLMN, PSTN, ISDN Internet External Networks Thesis work analysis in the Uu interface

7 Master’s thesis seminar presentation Seema Gyanwali UMTS Qos Traffic Class Conversational class Streaming class Interactive class Background class

8 Master’s thesis seminar presentation Seema Gyanwali UMTS Qos Architecture

9 Master’s thesis seminar presentation Seema Gyanwali Measurement Area and Route Overview of the test network

10 Master’s thesis seminar presentation Seema Gyanwali Logging Tools Nokia 3G test mobile TOM A portable engineering tool, which is installed in the laptop to measure and monitor the air interface of WCDMA wireless network Nethawk Analyzer Real time monitoring tool to measure the Iub interfac

11 Master’s thesis seminar presentation Seema Gyanwali Measurement Method A packet data call was established FTP download of a large file (100 Mb) was performed The call was maintained while driving from good coverage area to bad coverage area Measurements were repeated for different radio bearers (384 kbps, 128kbps, 64kbps services) Parameter: MaxBitRateDLPSNRT Analyzing Tools: Actix Analyzer Excelsheet

12 Master’s thesis seminar presentation Seema Gyanwali Measurement Results

13 Master’s thesis seminar presentation Seema Gyanwali Throughput and RSCP for 384 kbps RSCP: received power on one code measured on the primary CommonPilot Channel

14 Master’s thesis seminar presentation Seema Gyanwali Throughput and EcNo for 384 kbps EcNo: Received energy per chip divided by the power density in the band. It gives the quality of the common pilot channel signal.

15 Master’s thesis seminar presentation Seema Gyanwali Throughput and Downlink Radio Link Power for 384 kbps

16 Master’s thesis seminar presentation Seema Gyanwali Throughput and RSCP for 128 kbps

17 Master’s thesis seminar presentation Seema Gyanwali Throughput and EcNo for 128 kbps

18 Master’s thesis seminar presentation Seema Gyanwali Throughput and Downlink Radio Link Power for 128 kbps

19 Master’s thesis seminar presentation Seema Gyanwali Throughput and RSCP for 64 kbps

20 Master’s thesis seminar presentation Seema Gyanwali Throughput and EcNo for 64 kbps

21 Master’s thesis seminar presentation Seema Gyanwali Throughput and Downlink Radio Link Power for 64 kbps

22 Master’s thesis seminar presentation Seema Gyanwali Downlink Power for Different Radio Bearer Services Max power for 64 kbps service Max power for 128 kbps service Max power for 384 kbps service

23 Master’s thesis seminar presentation Seema Gyanwali Downlink Power for Different Radio Bearer Services For Non Real Time Traffic Ptx_max_rl = min{Ptx_CPICH-CPICHtorefRABoffset + SF_adjustment, Ptxtotalmax-PTxDPCHmax} SF_adjustment = Eb/No. Bit rate Eb/No ref.Bit rate ref

24 Master’s thesis seminar presentation Seema Gyanwali Average Throughput for Different Bearer Services

25 Master’s thesis seminar presentation Seema Gyanwali Coverage area for different Radio Bearer Services

26 Master’s thesis seminar presentation Seema Gyanwali Conclusion Packet Data performance in different radio condition is verified. And the conclusion is: 1. The max bit rate for different bearer services cannot be achieved in the whole range of the cell 2. The average throughput value for each service profile is obtained which is below the nominal value due to the TCP features 3. In poor coverage area the RSCP and EcNo decreases and at a certain point the throughput starts to degrade because the DL radio link power reaches the maximum and it becomes difficult to maintain the quality 4. The RSCP and EcNo value, when the throughput starts to collapse for each service profile, is found out which is quite optimistic due to the fact that there were no other load in the cell and in the neighboring cell 5. Different bearer service has different coverage area 6. The maximum downlink radio link power is different for each bearer services and the power reaches the maximum at different points