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Existing Billing
Mediation System
Charging Mediator
Downloading
Peer
Uploading Peer
QoS Coordinator
QoS Coordinator
Resource
Management System
(RACS/PCC)
Resource
Management System
(RACS/PCC)
Core Router
Core Router
IP Backbone
Access Router
Access Router
Core Router
FIGURE 3.15: A dynamic QoS provisioning scenario [Ma and Zhu, 2008].
The charge function of the peer will notify the user about the charge policy.
If the user agrees to buy the QoS service, the underlying routers are then
configured to provide the required guarantees via proper packet scheduling
and other resources provisioning.
3.5.4 Service Brokerage
A brokerage model is used in the proposed network architecture for the
provisioning of services among peers. When a peer wants a particular service
(e.g., downloading a certain file at a particular data rate), the network acting
as a broker attempts to locate such a supplying peer in the system. This is
usually accomplished by having some registry servers in the system keeping
track of the capabilities and charges required for every participating peer.
3.5.5 Discussion
The P2P network architecture proposed by Ma and Zhu [Ma and Zhu,
2008] described above is a practicable system. However, much of its actual
success relies on the cooperation among peers and the proper handling of
various security issues. For instance, if some peers collude to cheat the system,
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