Patent
1995-12-28
1997-11-04
Lee, Thomas C.
395427, 395410, G06F 1300
Patent
active
056849532
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF INVENTION
The invention relates to a process for forming and analyzing signalling messages in a program-controlled communication device, the signalling messages having message header information items and information elements appended thereto, comprising octet-oriented and information element-specific information items.
Signalling messages structured in this way are provided in particular in the case of the signalling protocols Q.931 and Q.93B standardized by the CCITT (Comitee Consultative International Telefonique e Telegrafique). In CCITT recommendation Q.931, the signalling protocol for the third protocol layer of an ISDN (Integrated Services Digital Network) basic access is defined. In analogy to this, the signalling protocol for a broadband ISDN basic access is standardized in CCITT recommendation Q.93B. Furthermore, for the signalling in communication networks acting on the basis of the asynchronous transfer mode, a signalling protocol structured in the same way is provided. In the case of these signalling protocols, each of the individual signalling messages is formed by a signalling message header and information elements appended thereto. The signalling message header has at least one protocol discriminator, indicating the signalling protocol used, a connection reference information item, serving to identify the respective connection in the local network, and a type information item, defining the type of the signalling message. Specified in the appended information item the actual signalling information elements are for the respective type of a signalling message. Each of these information elements is formed by a type information item, indicating the type of information element, a length information item, indicating the number of octets of the following signalling information items--only in the case of CCITT recommendation Q.93B--and by the appended signalling information items. According to the above-specified CCITT recommendations, both the signalling messages and the information elements are structured in an octet-based or byte-based manner. The information items contained in the message header and the information items to be inserted in the appended information elements are passed on during analysis or generation to the switching routines further processing the signalling messages or are taken over by said routines for forming a signalling message.
SUMMARY OF INVENTION
The object on which the invention is based is to design a process for analyzing and forming signalling messages explained at the beginning in such a way that the information items contained in the signalling messages to be analyzed or formed can be taken over by the switching routines in a communication device in a partial and time-independent manner.
In general terms the present invention is a process for forming and analyzing signalling messages in a program-controlled communication device. The signalling messages have a message header and information elements appended thereto, defining the information element type and comprising information element-specific information items. For each signalling message to be analyzed or formed for the first time, there is set up a buffer sore for storing the signalling message, and an auxiliary address store for storing the buffer store addresses. Using an address generation routine, the information element type and the initial addresses of the information element-specific information items buffer-stored in the buffer store are defined and entered on an information element basis into the auxiliary address store. The existence of an auxiliary address store is indicated to further processing routines of the communication device by transmitting an indicative information item.
It is to be regarded as an important aspect of the process according to the invention that, when forming or analyzing each signalling message for the first time, there is set up a buffer store, storing the signalling message, and an auxiliary address store, into which the information items defining the i
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Lee Thomas C.
Siemens Aktiengesellschaft
Ton David
LandOfFree
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