Читать книгу Mobile Communications Systems Development - Rajib Taid - Страница 37

Apart from network elements and their software systems, a mobile communications network consists of various active and passive infrastructures and devices. Network faults cannot be ruled out during the peak load time. Periodic and preventive maintenance minimizes the chances of failures and network downtime. Various tools are used for fault detection as well as correction of network faults. Network management aspects are described in Chapters 10–12.

Each system engineering area that is shown in Figure 2.14 is further divided into different subject areas, such as requirements, design, and signaling. The implementation details of each of the management areas shown in Figure 2.14 shall differ as defined by the concerned 3GPP TSs, from the GSM to the 5G system. For example, in the case of the GSM system, ciphering and encryption are done for messages exchanged between the MS and the RAN only, whereas in the case of the LTE or 5G system, ciphering is also done for messages exchanged between the MS and the core network element. Also, the implementation details of a particular management area mentioned in Figure 2.14 may differ in the case of CS and PS call. For example, in the GSM system, ciphering is performed by the BTS, whereas in the GPRS system, the same is performed by the SGSN.

In this book, only the Mobility Management, Air Interface Management, Security Management, and the Network Management system engineering areas are covered. The interested reader is recommended to look for other resources for the subscribers and services management area of a particular mobile communications network.