Читать книгу Mobile Communications Systems Development - Rajib Taid - Страница 34

In a mobile communications network, the air interface is used to transmit and receive data, i.e. signaling and voice traffic, over a wireless medium between a mobile device and its base trans‐receiver station. The air interface uses the radio frequency transmission and forms the basis for the physical layer between the mobile device and the base trans‐receiver station. Air interface management deals with the optimum allocation, re‐assignment, and releasing of the allocated radio frequency resources in terms of timeslots/channels among the mobile devices. The physical properties and structure of the air interface greatly differentiate one system from another one, i.e. TDMA/FDMA in GSM, WCDMA in UMTS, and OFDMA/SCDMA in the case of the LTE system. In Section 2.3.1, we discussed how the air interface evolved from the GSM to LTE. 5G system air interface management aspects are described in Chapter 19.