QoS Design for 3G Networks

Abdullah Al-SubhiJune 1, 2003

Outline Introduction.

QoS in 3G Networks UMTS. CDMA2000

3G QoS Techniques Traffic shaping and policing Scheduling Algorithm

QoS for streaming Applications Conclusion.

Introduction Why 3G? QoS Problems.

Delay. Resources limitations.

What is Quality of Service? Availability of the service Quality of information Consistent delivery

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

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

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

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

Traffic shaping and policing Definition System Model

Token Bucket Algorithm•Definition.

•Measures for packet arrives

•Case 1: conformed at arrival

•Case 2: non-conformed

•Case 3: shaped to be conformed

Traffic Conditioning scheme in UMTS •Traffic Shaping at the UE

Traffic Conditioning scheme in UMTS

Traffic Policing at the RNC

Traffic Scheduling Algorithm Definition Scheduling Strategy

Prioritization Capacity requirement Availability check

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.

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

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).

Mapping QoS Traffic Classes

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

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