Improved Protocol Conversion Methodology And Its Application

Petri net model of protocol conversion for CTF service: its universal coupling criteria and property analysis

“…The CTF service based on the Internet intelligent network (IIN) model [15] is taken as the research object. This service's message sequence chart (MSC) is shown as Figure 1 [14]. Since we will focus on the entity combined with service control gateway function (SCGF) and PSTN/ Internet iNTerworking (PINT) client, those messages directly related to the SCGF/PINT client should be paid attention to, which are numbered in Figure 1.…”

“…The SCF, SDF, SSF, CCF and SRF in Figure 1 stand for service control function, service data function, service switching function, call control function and special resource function, respectively. Figure 2 [14] shows the information [14,15] and interfaces related to the SCGF. A path between two interfaces of a gateway or between one interface and an internal point of gateway, through which information such as protocol message flows, is called IFT [14].…”

“…Figure 2 [14] shows the information [14,15] and interfaces related to the SCGF. A path between two interfaces of a gateway or between one interface and an internal point of gateway, through which information such as protocol message flows, is called IFT [14]. From the functional point of view, IFTs can be classified into three categories: media IFT, signalling IFT and management IFT.…”

“…Furthermore, the bi-directional management IFT D can be omitted in the following sections. The atomic protocol functions [1,2,14] on IFT A, IF3 are shown in Table I [14], which will be used only in Section 3.1. The CTF-related atomic protocol functions on IFT B, IF1 are shown in Table II [14] and those CTF-related ones on IFT B, IF3 are shown in Table III [14].…”

“…The atomic protocol functions [1,2,14] on IFT A, IF3 are shown in Table I [14], which will be used only in Section 3.1. The CTF-related atomic protocol functions on IFT B, IF1 are shown in Table II [14] and those CTF-related ones on IFT B, IF3 are shown in Table III [14]. If two atomic protocol functions on the same IFT but on different interfaces have the same semantic meaning, there is a semantic mapping relationship between them.…”