This paper proposes a signaling protocol which can be applied to high‐capacity digital mobile communications networks. First, a hierarchical network function model based on the Intelligent Network (IN) concept is described. In the model, the need for mobile transit switching capability and subscriber line signaling transfer capability is discussed. Second, interoffice signaling protocol and subscriber line signaling protocol are proposed. The interoffice signals consist of circuit‐related signals which are based on the SS No. 7 ISDN User Part (ISUP) and noncircuit‐related signals which apply SCCP and TCAP. The subscriber line layer‐3 signals are designed for expansion and radio frequency efficiency. The layer‐3 grouping function is applied for efficient use of radio frequency. Third, some examples of procedures using those signals and comparisons of signal number and signal volumes between the digital system and the present analog system are shown.
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