QoS Design for 3G Networks Abdullah Al-Subhi June 1, 2003.
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Transcript of QoS Design for 3G Networks Abdullah Al-Subhi June 1, 2003.
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QoS Design for 3G Networks
Abdullah Al-SubhiJune 1, 2003
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Outline Introduction.
QoS in 3G Networks UMTS. CDMA2000
3G QoS Techniques Traffic shaping and policing Scheduling Algorithm
QoS for streaming Applications Conclusion.
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Introduction Why 3G? QoS Problems.
Delay. Resources limitations.
What is Quality of Service? Availability of the service Quality of information Consistent delivery
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UMTS QoS Architecture Control plane QoS Service manager Translation function Admission/capability Subscription Control
User Plane QoS Mapping function Classification function Resource manager Traffic conditioner
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UMTS UMTS QoS Classes.
Traffic class Conversational class
Real Time
Streaming class
Real Time
Interactive class
Best Effort
Background class
Best Effort
Fundamental characteristics
- Preserve time relation (variation) between information entities of the stream
- Conversational pattern (stringent and low delay )
- Preserve time relation (variation) between information entities of the stream
- Request response pattern
-Preserve payload content
-Destination is not expecting the data within a certain time
-Preserve payload content
Example of the application
voice streaming video web browsing telemetry, emails
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CDMA2000 Architecture Radio Bearer Service Power Control Radio Admission Control Radio Resource Control (RRC) Scheduling
R-P bearer Service Call Admission Control QoS Transport in R-P interface
External Bearer Service
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CDMA2000 QoS implementation CDMA2000 define two modes of QoS
Non-assured Mode QoS Assured Mode QoS
Assured Mode QoS profile Priority. Data Rate Data Lose Rate
Maximum Delay
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Traffic shaping and policing Definition System Model
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Token Bucket Algorithm•Definition.
•Measures for packet arrives
•Case 1: conformed at arrival
•Case 2: non-conformed
•Case 3: shaped to be conformed
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Traffic Conditioning scheme in UMTS •Traffic Shaping at the UE
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Traffic Conditioning scheme in UMTS
Traffic Policing at the RNC
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Traffic Scheduling Algorithm Definition Scheduling Strategy
Prioritization Capacity requirement Availability check
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DIFFSERV based QoS Architecture In 3G Network
Key components of the proposed Architecture Multicast Model
PIM Active Join. PIM Passive Join.
Mobile Proxy Agent Intitlize the connection for mobile host in its cell by sending PIM
active join tp RP and promots the mobile proxy agents in the neighboring cells to send PIM Passvie Join message forwards RP.
Implmemnts a mesaurment based scheme that that uses the information carried in probing packet header to determine the delay chariseistic for different services class.
Sends the periodic feeback to the source node reqarding the service class giving thee best delay-jitte performance.
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DIFFSERV based QoS Architecture In 3G Network
Key components of the proposed Architecture Streaming Proxy Server Agent
To smooth the incoming streaming traffic to remove delay-jitter accumulated as streaming traffic traverses the rest of the internet.
To perform the additional functionality of trans-coding . To send probing packet mapped to different services class to the
Mobile Proxy Agent. Probing packets carry the time-stamp, which helps the Mobile Proxy Agents to calculate the delay-jitter for
Seamless QoS using probing-based approach
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QoS Issues in the Converged 3G and Wired
Networks The RCL Architecture
resource control agent (RCA) admission control agent (ACA) Reservation requests
Network Services and Traffic classes premium constant bit rate (PCBR) premium variable bit rate (PVBR) premium multimedia (PMM) premium mission critical (PMC) best effort (BE).
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Mapping QoS Traffic Classes
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Control and User Plane Internetworking
The direct way implies that their mechanisms are aware of the details of each other, and the signaling protocol can be a proprietary one. This scenario ensures that the mapping among the traffic classes can be tuned to the best possible way.
The indirect way neither makes use of a proprietary signaling protocol nor requires the QoS management mechanisms to be aware of each other. This scenario is most appropriate in the case of independent service providers that do not have specific inter-domain partners
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Conclusion UMTS
QoS Architecture. QoS classes. QoS management
CDMA2000 Non-assured Mode QoS Assured Mode QoS
Traffic shaping and policing Token Bucket Algorithm Traffic Conditioning scheme in UMTS
Traffic Scheduling Algorithm for QoS in 3G Networks Scheduling Strategy Capacity requirement Availability check
DIFFSERV based QoS Architecture In 3G Network. Multicast Model Mobile Proxy Agent Streaming Proxy server agent Seamless QoS using probing-based approach