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QoS in Wireless Networks ELG5125 Presentation Author: Thanh Cao email: thanhkcao@gmail.com Date: November 29, 2005. Problem Statement. Report on schemes, specification to ensure, manage QoS in third- generation (3G) wireless networks, specifically in: UMTS QoS, End-to-end QoS. QoS mapping.
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Analog
2G
2.5G
3G
Summary of Wireless Evolution
Source: RD Gitlin, “Next Generation Wireless Networking Presentation,” 2003, Columbia University.
Packet arrival
Monitoring
(QoS Parameters)
Mapping
Admission
control
Scheduling & resource allocation
Channel Condition (from physical layer)
QoS mechanisms: - mapping, admission control, scheduling, resource allocation.
- have to monitor and react to the environment in real time
Traffic Class
Conversational
Streaming
Interactive
Background
Fundamental Characteristics
Conversational pattern (low delay)
Preservation of time relation between info entities
Preservation of time relation between info entities
Expect response to request
Preservation of payload contents
Destination does not expect data within a certain time
Preservation of payload contents
Application examples
Voice, voice over IP, video conferences
Streaming audio, video
Web browsing
Emails, SMS, background download
UMTS QoS Traffic Classes and Applications (Ref [5])
Traffic Class
Conversational
Streaming
Interactive
Background
Max bit rate (kbps)
2,000
2,000
2,000 - overhead
2,000 - overhead
Delivery order
Yes/no
Yes/no
Yes/no
Yes/no
Max SDU size
<= 1500, 1502
<= 1500, 1502
<= 1500, 1502
<= 1500, 1502
SDU format info
TBD
TBD
SDU error ratio
10-2, 7*10-3, 10-3, 10-4, 10-5
10-1, 10-2, 7*10-3, 10-3, 10-4, 10-5
10-3, 10-4, 10-6
10-3, 10-4, 10-6
Delivery of erroneous SDU
Yes/no
Yes/no
Yes/no
Yes/no
Transfer delay (ms)
100 (max)
300 (max)
Guaranteed bit rate
<= 2,000
<= 2,000
Traffic handling priority
1,2,3
Allocation/retention of priority
1,2,3
1,2,3
1,2,3
1,2,3
Source stats descriptor
Speech/unknown
Speech/unknown
Signaling indication
Yes/no
Attribute Value Ranges for UMTS Bearer Attributes (Ref [5])
Core Network
RNS
SRNC
RNS
SRNC
CRNC
CRNC
RAN
Node B
Node B
Node B
Node B
Node B
Node B
UE
RAN consists of many RNS, among which UE can roam (Ref [9])
UMTS Class
RCL
DiffServ
Characteristics
Conversational
PCBR
AF and EF PHBs
Max bit rate (kb/s)
< 2048
Max. per flow 200
Max packet size (bytes)
=< 1500, 1502
256
Packet error ratio
10-2, 7*10-3, 10-3, 10-4, 10-5
< 10-8
Transfer delay (ms)
100 (max)
150 (max)
Streaming
PVBR
AF4
Max bit rate (kb/s)
< 2048
Max. per flow 1000
Max packet size (bytes)
=< 1500, 1502
1000
Packet error ratio
10-1, 10-2, 7*10-3, 10-3, 10-4, 10-5
< 10-6
Transfer delay (ms)
250 (max)
250 (max)
Interactive
PMMPMC
AF3
Max bit rate (kb/s)
< 2048 - overhead
Max. per flow 250Max. per flow 50
Max packet size (bytes)
=< 1500, 1502
1500 1500
Packet error ratio
10-3, 10-4, 10-6
<10-3 < 10-4
Traffic handling priority
1, 2, 3
1 2, 3
Background
PMCBE
AF2 or AF1 or BE
Max bit rate (kb/s)
< 2048 - overhead
Max. per flow 50 No QoS
guarantees
Max packet size (bytes)
=< 1500, 1502
1500
Packet error ratio
10-3, 10-4, 10-6
< 10-4
[1] Chen L., Kayama H., Umeda N., “Power Resource Cooperation Control Considering Wireless QoS for CDMA Packet Mobil Communication Systems,“ The 13th IEEE International Symposium on Personal, Indoor, and Mobile Radio Communication, 2002.
[2] Dahlman E, Beming P, Knutsson J, Ovesjo F, Persson M, Roobol C, “WCDMA – The Radio Interface for Future Mobile Multimedia Communications,” IEEE Transactions on Vehicular Technology, Vol 47, No. 4, November 1998.
[3] Desposito J, “A Bump in the Path to 3G,” Electronic Design Online ID #3467, May 15, 2000.
[4] Dixit S, Guo Y, Antoniou Z, “Resource Management and Quality of Service in Third Generation Wireless Networks,” IEEE Communications Magazine Feb 2001, pp 125 – 133.
[5] ETSI, 3GPP, “Quality of Service Concept and Architecture,” 3GPP TS 23.107 version 6.3.0 Release 6.
[6] ETSI, 3GPP, “End-to-End Quality of Service Concept and Architecture,” 3GPP TS 23.207 version 6.6.0 Release 6.
[7] Guo JY, Chaskar H, “Class-Based Quality of Service over Air Interfaces in 4G Mobile Networks,” IEEE Communications Magazine, March 2002, pp 132 - 137.
[8] Maniatis SI, Nikolouzou EG, Venieris IS, “QoS Issues in the Converged 3G Wireless and Wired Networks,” IEEE Communications Magazine, August 2002.
[9] Mobile Wireless Internet Forum, “IP in the RAN as a Transport Option in 3rd Generation Mobile Systems,” Release 2.0.0, Reference number MWIF 2001.084.
[10] Saud L.C., Limos R.P., “Third Generation Mobile Wireless Networks Quality of Service, with a 2.5G Case Study Using Differentiated Service,” IEEE/Sarnoff Symposium on Advances in Wired and Wireless Communications, April 26 – 27, 2004, pp 71-74.