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Powerpoint 프레젠테이션

Comparative Study of Protocols for Dynamic Service
Negotiation in the Next-Generation Internet
Jongwon Park
(kaimas@kw.ac.kr)
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
‰ SrNP message
™ 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
‰ COPS-SLS
™ 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
™ Lightweight
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.

Source: http://cpe.kw.ac.kr/upload/service(2).pdf

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