QoS Design for 3G Networks Abdullah Al-Subhi June 1, 2003

Outline Introduction. QoS in 3G Networks 3G QoS Techniques Conclusion. UMTS. CDMA2000 3G QoS Techniques Traffic shaping and policing Scheduling Algorithm QoS for streaming Applications Conclusion.

Introduction Why 3G? QoS Problems. What is Quality of Service? Delay. Resources limitations. What is Quality of Service? Availability of the service Quality of information Consistent delivery

UMTS QoS Architecture Control plane QoS User 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 ) - Request response pattern -Preserve payload content -Destination is not expecting the data within a certain time Example of the application   voice   streaming video web browsing   telemetry, emails

CDMA2000 Architecture Radio Bearer Service R-P 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