Comparative Study of Protocols for Dynamic Service Negotiation in the Next-Generation Internet Jongwon Park ([email protected]) Kwang Woon University Communication Protocol Engineering Lab Communication Jongwon Park Protocol Engineering Lab.
Introduction Characterizing SLA and SLS A Generic Negotiation Framework Resource Negotiation And Pricing Protocol Service Negotiation Protocol COPS-SLS Dynamic Service Negotiation Protocol QoS NSIS Signaling Layer Protocol QoS Generic Signaling Layer Protocol Characteristic of A Service Negotiation Protocol Comparative Study of The Negotiation Protocols Conclusions Communication Jongwon Park Protocol Engineering Lab.
The internet is rapidly evolving into a commercial infrastructure
Resulting in increased demand for QoS guarantees from network
Allow users to dynamically adjust their desired service along with acceptable prices for the service
It presents a survey of the various service negotiation protocols and qualitative comparison of them
It elaborates on the characteristic of an ideal service negotiation protocol Communication Jongwon Park Protocol Engineering Lab.
SLA (Service Level Agreement)
It is a service contract between providers and customers The technical specification is given in SLSs
SLS (Service Level Specification)
It is a set of parameters and their values It define the service offered to a traffic stream SLS parameters
9 Scope specification 9 Flow specification 9 Traffic specification 9 Performance guarantee specification 9 Service schedule specification 9 SLS identifier 9 Price 9 Device and network capabilities Communication Jongwon Park Protocol Engineering Lab. Communication Jongwon Park Protocol Engineering Lab.
Resource Negotiation And Pricing Protocol
RNAP (Resource Negotiation And Pricing protocol)
One of the earliest protocols developed to facilitate service negotiation It can be considered an extension of Resource Reservation Protocol.
Characteristics of RNAP
Allow for the negotiation of price of the contracted services Work with both centralized and distributed implementations of NMs
Employs a soft state approach to negotiation Communication Jongwon Park Protocol Engineering Lab.
SrNP (Service Negotiation Protocol)
It is not specific to any particular SLS format Agree on the value of the features included in the document under negotiation
Can be encoded in ASCII, basic encoding rules(BER), XML for the stack used Encapsulate SrNP message in widely deployed protocols such as RSVP, COPS Communication Jongwon Park Protocol Engineering Lab.
COPS (Common Open Policy Service)
Distinguishes the interactions between a subscriber and the NM into two phases : configuration and negotiation
In the Configuration phase, the service provider informs the subscriber how to request a level of service.
After the configuration phase, the subscriber can start the negotiation
An extension of the COPS protocol to negotiate an SLS either between a network and a customer or two networks Communication Jongwon Park Protocol Engineering Lab.
DSNP (Dynamic Service Negotiation Protocol)
It was developed exclusively for dynamic service negotiation. It is lightweight and better suited to wireless devices such as PDAs Whenever a mobile subscriber negotiates, the NM disseminates the QoS profile to edge router
Moving into adjacent networks, it continues to do the negotiated service without any additional signaling Communication Jongwon Park Protocol Engineering Lab.
QoS-NSLP (NSIS Signaling Layer Protocol)
It is a protocol for signaling QoS reservations It is an extension of RSVP Its working is quite similar to RNAP A better fit for distributed settings, not assume the existence of a centralized resource manager to carry out
NSIS (Next Steps in Signaling)
Be structured in two layers NTLP(NSIS Transport Layer Protocol) and NSLP (NSIS Signaling Layer Protocol)
Signal protocol with QoS guarantees is not in IP network Communication Jongwon Park Protocol Engineering Lab.
QoS-GSLP (Generic Signaling Layer Protocol)
Used for controlling and negotiating bilateral QoS requirements in mobile and builds on top of NSIS protocol suite
Use knowledge about mobile and traffic patterns to set up in advance Reduces the SLS setup times for Mobile subscribers Can be advantageous in a dynamic environment Communication Jongwon Park Protocol Engineering Lab.
Characteristic of A Service Negotiation Protocol
The features desired in an ideal service negotiation protocol
Primary negotiation capabilities
9 It is vital for negotiating and establishing an SLS dynamically
Compatibility with QoS architectures Transparency to wireless link layer technologies
9 The needed transparency for moving between disparate wireless environments
Reduced signaling overhead
9 Signaling consumed precious resource like bandwidth and battery of wireless device should be sparingly used
Transparency to SLS parameters
9 Protocols developed does not predefine the format of an SLS
Extend existing protocols
9 Use of previously existing signal protocol
9 To use across device with varying capabilities , protocol should be lightweight Communication Jongwon Park Protocol Engineering Lab.
Comparative Study of The Negotiation Protocols
Communication Jongwon Park Protocol Engineering Lab.
This presents an overview of the various service negotiation protocols
All the protocols possess the basic negotiation capabilities They differ in terms of costs, complexity, SLS transparency and overhead. Communication Jongwon Park Protocol Engineering Lab.
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