The Research And Design Of HLR In CDMA Mobile Communication System

The Home Location Register (HLR) is an integral component of CDMA, TDMA and GSM networks. The HLR is the main database of permanent subscriber information for a mobile network. It contains pertinent user information, including basic information, profile information, current location and account status etc. HLR is a very important functional entity of the mobile communication network, exchanging diversified signal with other functional entities in the network.Firstly, this paper systematically introduces the framework of CDMA mobile communication network, related core technologies and Signaling System #7, and analyses the role HLR acts in mobile communication system and the relationship between HLR and ANSI-41 series standards.Secondly, a kind of design method of HLR in CDMA communication system is discussed emphatically. In this method, using the way of modularizing, HLR is divided into 3 submodules: Signal Processing Unit (SPU), HLR Database (HDB) and Service Management Unit (SMU). Then following are analyized and described: the hiberarchy of hardware and major software module of SPU, the design of two-unit standby system for hardware of HDB, the design of software module of HDB, the design of software of SMU and the its extension based on Web. And then it is pointed out that the traditional software design of HDB's single process and multi-thread has some disadvantages like bottle-neck of efficiency and weakness of stability. Applying the way of functional division and redundant backup, the traditional design of HDB software is improved, and a design of multi-process and multi-thread HDB is proposed. The new means adds a control module into HDB, and adapts the old message-processing module to the new form of multi-processing-module in HDB. By using it, the efficiency and stability of HLR proved greatly. Each submodule of HLR is functioningcentralized, independent and scalable.At last, this paper discusses a problem of repeated parameters checking in the process of SMU and HDB developing, and presents a solution based on interface definition.