Conclusions and Future Work
5.2 Future Work
Based on the research results of this dissertation, we suggest the following topics for further study.
Reducing Signaling Delay in the PCC System: Chapter 2 provided the signaling delay mea-surement in this testbed. The meamea-surement results indicate that the PCC network delay is unnegligible in an IMS call setup. Moreover, in the architecture defined in 3GPP 23.203 [21] and 23.402 [18], enforcing PCC rules in 3GPP and non-3GPP interconnected net-works involves more signaling messages (especially, handover between 3GPP and non-3GPP networks) and therefore causes longer network delay. We will analyze the handover performance in heterogeneous networks, and then devise a mechanism for reducing sig-naling delay.
IBM WsT and Chunghwa Telecom IMS Integration: In our current implementation, the charg-ing application is connected to IBM Rational Application Developer Telecom Toolkit, which provides a simulation environment for Parlay and IMS network. We will integrate the IBM WsT and the IMS of Chunghwa Telecom as the application service platform for a real-world deployment. Once the integration is done, we will connect the GAS described in Chapter 4 to the integrated WsT environment by simply modifying the endpoint to the WsT’s URI.
NGN/IMS Application Development: We described the Internet-mobile platform for telecom applications in Chapter 4. Our platform provides an environment to enable “mashup” ser-vice creation. For example, we can build a social network with telecom communication capabilities, namely “JoinMe” service. With this service, a mobile user can announce an immediate activity to nearby associates with common sets of subscriptions via the web page, voice phone call, short message service (SMS) and multimedia messaging service (MMS) [11], and the service can be charged through our platform. The published activity will target a set of subscribers that are unknown to the initiator of the activity. The intel-ligent application will match the activity to individuals who subscribe to common topics
with the activity. Any subscriber who wants to join in the activity can reply through the same methods (e.g., voice, SMS, MMS). The mobile and instantaneous nature of the plat-form will help us creating new values and offering differentiated NGN/IMS services on the Internet.
The Performance for Credit Pre-reservation Mechanism: In this dissertation, we proposed an analytic model to investigate the CPM performance for exponential distribution packet interarrival time. This analytic model adopted exponentially-distributed packet interar-rival assumptions, and the conclusion under such assumptions may be misleading in the presence of heavy-tailed distributions (e.g., Pareto distribution). In the future, we will consider the Pareto distribution, which can accurately reflect the nature of heavy-tail in-ternet traffic in the multiple session telecommunication networks. It has been shown that the Pareto distribution with the shape parameter 1 ≤ b ≤ 2 can approximate the packet traffic very well. Modelling of heavy-tail traffic is necessary so that networks can be pro-visioned based on accurate assumptions of the traffic that they carry. Therefore, we will extend the packet interarrival time in our analytic models for Pareto distribution.
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