1. End-to-End QoS Specification Issues in the Wired and Wireless Environment 通工所 陳昱豪

2. OUTLINE  INTRODUCTION  QoS SIGNALING PROTOCOLS Existing Protocols The NSIS Approach  THE GENERIC SERVICE SPECIFICATION FRAMEWORK Generic Service Specification Schema Intelligent Mapping Algorithm GSS Schema Language  CONCLUSIONS

3. INTRODUCTION  QoS is a topic that attains a lot of attention in both wired and wireless worlds  End-to-End QoS provision is not accomplished easily  Need an end-to-end QoS signaling protocols  NSIS Transport Layer Protocol (NTLP) NSIS QoS Signaling Protocol (NSLP)

5. QoS SIGNALING PROTOCOLS  A common language is needed for communicating end to end the QoS requirements of user traffic  Carry the information specified in the corresponding QoS framework  Separate the signaling protocols from the carried information  Interaction between the signaling and mobility protocols  Loose integration  Tight integration

6. Existing Protocols  Existing QoS signaling solution seem insufficient: interdomain signaling scalability performance mobility support interworking with policy security mechanism  Resource Reservation protocols (RSVP)  YESSIR, Boomerang, BGRP

7. The NSIS Approach  The lower layer -- the signaling transport layer (NTLP)  Offer generic signaling functionalities  The upper layer – the signaling application layer (NSLP)  Application-specific  NSLP uses the services offered by the NTLP : QoS provision

8. THE GENERIC SERVICE SPECIFICATION FRAMEWORK  Service Class “ the definition of semantics and parameter of a specific type of QoS ”  IntServ-service classes: (guaranteed, controlled load, best effort)  IntServ---DiffServ  UMTS-service classes: (conversational, streaming, interactive, background)  GSS Framework (Offer a generic service class specification schema)

10. Generic Service Specification Schema(1/4)  GSS schema must define all parameter  Goal-- 1.The appropriate service class matching the profile described in the requested QoS specification must be selected 2.The appropriate traffic parameters must be extracted from the requested QoS specification  Traffic specification  traffic issues: admission control, resource management, traffic policing  parameter: bit rate, packet size, burstiness, greediness, adapticity, duration

11. Generic Service Specification Schema(2/4)  Bit rate  constant or variable  measured in bits per second  option: very low, low, medium, high, very high, unspecified  Traffic control operation — bucket rate or admission control  Packet size  constant or variable  measured in bytes  option: very small, small, medium, big, very big, unspecified  IP telephony applications usually produce packets of constant size less than 100 bytes  Large one??

12. Generic Service Specification Schema(3/4)  Burstiness  information regarding the bandwidth requirement  option: very low, low, medium, high, very high, unspecified  The selection of the appropriate service class and traffic-oriented operation  Greediness  flood the connection with as many packets as possible  The flow lowers its bandwidth consumption until it reaches a stable point  option: yes, no, unspecified

13. Generic Service Specification Schema(4/4)  Adaptivity  a characteristic of the application that produces the flow  The corresponding resource reservation in the network have to be modified to reflect the new condition  Option: yes, no, unspecified  Duration  Traffic-related  information about the nature of a service  Short-living flows — near-real-time transaction (banking)  Option: short living, long living, unspecified

14. Intelligent Mapping Algorithm  Mapping algorithm is simple  compare one by one  Select the closer service class  Algorithm ’ s operation depends on parameter defined within the GSS schema  Each parameter of the QoS and traffic specification is associated with a weight  EX: low-delay real-time traffic Maximum transfer delay and maximum delay must have great weight Bit rate (low), packet size (small), burstiness (low)  11 options for weight from 0---10  Adds and substracts

15. GSS Schema Language  Used the Extensible Markup Language (XML)  advantage: offer a standardized text structure, which represents not only the data but also the meta-data  The Data Type definition (DTD)

17. CONCLUSIONS  Focus on the specification of QoS at the service level  Examine in detail all the important QoS models  On wireless access networks, QoS provisioning is significant

18. Q&A

19. Thanks for listening