P2P Network Architectures - Peer-to-Peer Computing: Applications, Architecture, Protocols, and Challenges - page 45

Existing Billing
Mediation System

Existing AAA Server

Non-IP-Based
Serving Network
(PSTN/PLMN)

Bootstrap Server Charging Mediator

QoS Coordinator Non-IPIW Gateway

IPIW Gateway

New Peer

IP-Based
Serving
Network
(NGN/IMS/
P2P)

Bootstrap Peer Bootstrap Peer

Resource
Management System
(RACS/PCC)

Existing Peer

IP Backbone

Edge Router

Core Router

Core Router

IP Backbone

Edge Router

Access Router

Core Router

FIGURE 3.14: A carrier-grade P2P network architecture [Ma and Zhu,
2008].

IP-IW Gateway. Carry out necessary protocol functions for internetwork-
ing with other P2P networks or IP-based service network.

Non-IP IW Gateway. Carry out necessary protocol functions for internet-
working with other non-IP service networks.

There are several key characteristics and requirements of this proposed
architecture.

•Client's Participation in Charging: In the proposed network archi-
tecture, each peer needs to participate in the usage charging process.
Specifically, the client program needs to report to the charge mediator
about the usage statistics. Here, of course, full cooperation of each peer
is a necessity.

•QoS Initiation by the Peer: Each peer can dynamically initiate QoS
changes which are handled by the QoS mediator.

•AAA Tasks Handled by Existing Servers: The tasks of authen-
tication, authorization, and accounting can be handled by the existing
AAA servers in the telecom company's network. Thus, there is no need
for new investment. Furthermore, current network users can use the ex-
isting credential information to access P2P services.