Post on 03-Feb-2016
description
A Study of Non Real Time Radio Bearer
Packet Data Performance in UMTSRadio Access Network
Seema Gyanwali
Supervisor: Professor Sven Gustav Häggman
Instructor: Janos Gyori
12.10.04
2 Master’s thesis seminar presentation 12.10.2004 Seema Gyanwali
Contents
• Introduction
• Goals
• Background
• Measurement Introduction
• Measurement Method
• Results
• Conclusions
3 Master’s thesis seminar presentation 12.10.2004 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 12.10.2004 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 12.10.2004 Seema Gyanwali
Background
6 Master’s thesis seminar presentation 12.10.2004 Seema Gyanwali
Network Elements
CN
MSC/VLR
SGSNRNC
Node B
Node B
RNC
Node B
Node B
UTRAN
Iu
IubIur
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 12.10.2004 Seema Gyanwali
UMTS Qos Traffic Class• Conversational class
• Streaming class
• Interactive class
• Background class
Traffic Class Applications Delay Jitter Low Losses
Guaranteed Bit-rate
Conversational (Real time)
Voice, one to one video
Stringent Stringent Yes
Streaming (Real time) Broadcast audio video
Constrained Constrained Yes
Interactive (Non real time)
Web, database, games
Loose Yes
Background (Non real time) Emails, file transfer
Yes
8 Master’s thesis seminar presentation 12.10.2004 Seema Gyanwali
UMTS Qos Architecture
PhysicalRadio
Services
PhysicalBearer Services
BB Serviceslu Bearerservices
Radio BearerServices
Radio Access Bearer Services CN Bearer Services
TE/MTBearer
ServicesUMTS Bearer Service
ExternalBearer
Services
End-to-End Services
TE CNGateway
CN luedgenode
UTRAN/GERAN
MT TE
UMTS
PhysicalRadio
Services
PhysicalBearer Services
BB Serviceslu Bearerservices
Radio BearerServices
Radio Access Bearer Services CN Bearer Services
TE/MTBearer
ServicesUMTS Bearer Service
ExternalBearer
Services
End-to-End Services
TE CNGateway
CN luedgenode
UTRAN/GERAN
MT TE
UMTS
9 Master’s thesis seminar presentation 12.10.2004 Seema Gyanwali
Measurement Area and Route Overview of the test network
10 Master’s thesis seminar presentation 12.10.2004 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
3G-SGSN
Test UE
TOM
RNC GGSN
Iu-PS
FW
Node B
Iub FTP Server
RNC GGSNGGSN FW3G-SGSN
3G-SGSN3G-SGSN
3G NethawkAnalyzer
3G-SGSN
Test UE
TOM
RNC GGSNGGSN
Iu-PS
FW
Node B
Iub FTP Server
RNC GGSNGGSN FW3G-SGSN
3G-SGSN3G-SGSN
3G NethawkAnalyzer
11 Master’s thesis seminar presentation 12.10.2004 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 12.10.2004 Seema Gyanwali
Measurement Results
13 Master’s thesis seminar presentation 12.10.2004 Seema Gyanwali
Throughput and RSCP for 384 kbps
RSCP: received power on one code measured on the primary CommonPilotChannel
14 Master’s thesis seminar presentation 12.10.2004 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 12.10.2004 Seema Gyanwali
Throughput and Downlink Radio Link Power for384 kbps
0
50000
100000
150000
200000
250000
300000
350000
400000
450000
1 101 201 301 401 501 601 701 801 901
No. of Samples
Th
rou
gh
pu
t b
ps
0
5
10
15
20
25
30
35
40
45
DL
Rad
io L
ink P
ow
er
dB
m
Throughput DL Radio Link Power
16 Master’s thesis seminar presentation 12.10.2004 Seema Gyanwali
Throughput and RSCP for 128 kbps
17 Master’s thesis seminar presentation 12.10.2004 Seema Gyanwali
Throughput and EcNo for 128 kbps
18 Master’s thesis seminar presentation 12.10.2004 Seema Gyanwali
Throughput and Downlink Radio Link Power for128 kbps
0
20000
40000
60000
80000
100000
120000
140000
160000
1 101 201 301 401 501 601 701 801 901
No. of Samples
Th
rou
gh
pu
t b
ps
0
5
10
15
20
25
30
35
40
DL
Rad
io L
ink
Po
wer
d
Bm
Throughput DL Radio Link Pow er
19 Master’s thesis seminar presentation 12.10.2004 Seema Gyanwali
Throughput and RSCP for 64 kbps
20 Master’s thesis seminar presentation 12.10.2004 Seema Gyanwali
Throughput and EcNo for 64 kbps
21 Master’s thesis seminar presentation 12.10.2004 Seema Gyanwali
Throughput and Downlink Radio Link Power for64 kbps
0
10000
20000
30000
40000
50000
60000
70000
80000
1 101 201 301 401 501 601 701 801 901 1001
No. of Samples
Th
rou
gh
pu
t b
ps
0
5
10
15
20
25
30
35
40
DL
Rad
io L
ink
Po
wer
d
Bm
DL Radio Link Pow er Throughput
22 Master’s thesis seminar presentation 12.10.2004 Seema Gyanwali
Downlink Power for Different Radio Bearer Services
10
15
20
25
30
35
40
451
32
63
94
12
5
15
6
18
7
21
8
24
9
28
0
31
1
34
2
37
3
40
4
43
5
46
6
49
7
52
8
55
9
59
0
62
1
65
2
No. of Samples
DL
Ra
dio
Lin
k P
ow
er
dB
m64 kbps RB 128 kbps RB 384 kbps RB
Max power for 64 kbpsservice
Max power for 128 kbpsservice
Max power for 384 kbpsservice
23 Master’s thesis seminar presentation 12.10.2004 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 rateref
24 Master’s thesis seminar presentation 12.10.2004 Seema Gyanwali
Average Throughput for Different Bearer Services
365kbps
121kbps
58kbps0
50
100
150
200
250
300
350
400
Bits
per
sec
Average Throughput
384 kbps R B 128 kbps R B 64 kbps R B
365kbps
121kbps
58kbps0
50
100
150
200
250
300
350
400
Bits
per
sec
Average Throughput
384 kbps R B 128 kbps R B 64 kbps R B
25 Master’s thesis seminar presentation 12.10.2004 Seema Gyanwali
Coverage area for different Radio Bearer Services
RB in kbps RSCP in dBm EcNo in dB384 kbps RB -102 -9128 kbps RB -104 -1064 kbps RB -105 -11
26 Master’s thesis seminar presentation 12.10.2004 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