What is GSM Air interface?

What is GSM Air interface?

The GSM Air Interface (Um) provides the physical link between the mobile and the network. Some of the key characteristics of the air interface are given in Table 47.3 As already described, GSM is a digital system employing time division multiple access (TDMA) techniques and operating in the 900MHz band.

What is GSM radio interface?

The GSM radio interface is based on a TDMA structure with eight time slots and 200 kHz carrier bandwidth. To increase data rates, today’s GPRS and EDGE terminals can use multiple time slots for transmission, reception, or both. The highest specified radio-interface data rate using GPRS is shown for each scheme [101].

What are the channel types of GSM system?

There are two main types of GSM channels viz. physical channel and logical channel. Physical channel is specified by specific time slot/carrier frequency.

What is the duration of 1 TDMA frame of GSM which carries 1250 bits?

GSM has physical and logical channels. The logical channel is time-multiplexed into 8 timeslots, with each timeslot lasting for 0.577ms and having 156.25 symbol periods. These 8 timeslots form a frame of 1,250 symbol periods.

What is the 2G air interface?

The Air Interface The 2G base station is a Basic Transceiver Station (BTS) controlled by the Base Station Controller (BSC). The 3G base station is a Node B controlled by the Radio Network Controller (RNC).

What is common air interface?

Definition. The Common Air Interface (CAI) is a standard that allows a mobile unit, such as a cellular telephone, to communicate with a base station.

What are GSM protocols?

The Global System for Mobile Communications (GSM) is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation (2G) digital cellular networks used by mobile devices such as mobile phones and tablets.

What is burst and its types?

As a result of this a number of different types of GSM burst are defined. Normal burst uplink and downlink. Synchronisation burst downlink. Frequency correction burst downlink. Random Access (Shortened Burst) uplink.

Is GSM digital or analog?

transmission rate—GSM is a digital system with an over-the-air bit rate of 270 kbps. access method—GSM utilizes the time division multiple access (TDMA) concept. TDMA is a technique in which several different calls may share the same carrier. Each call is assigned a particular time slot.

What is the main function of NSS?

Network switching subsystem (NSS) (or GSM core network) is the component of a GSM system that carries out call out and mobility management functions for mobile phones roaming on the network of base stations.

What is the duration of a GSM TDMA frame?

The GSM standard [1] specifies a TDMA frame as a combination of 8 time slots. Each time slot has a duration of 3/5200 seconds (about 0.577 ms) and a time slot number (TN) from 0 to 7. GSM frames use GMSK modulation, where one symbol is equivalent to one bit.

What is the basic service unit of GSM communications?

What is the basic service unit of GSM communications? The Location Area is the area in which a subscriber can be paged. GSM provides requirements for analog cellular services. The Home Location Register (HLR) is a database used for storing and managing subscriptions.

What is the GSM air interface structure?

GSM Air Interface structure (FDMA/TDMA)  GSM utilizes a combination of frequency division multiple access (FDMA) and time division multiple access (TDMA) on the Air-interface. That results in a two-dimensional channel structure,

What is GSM and how does it work?

What is GSM? The Global System for Mobile communications is a digital cellular communications system. It was developed in order to create a common European mobile telephone standard but it has been rapidly accepted worldwide. now: Global System for Mobile Communication.

What are the applications of GSM 23?

Applications of GSM 23 • Mobile telephony • GSM-R • Telemetry System – Fleet management – Automatic meter reading – Toll Collection – Remote control and fault reporting of DG sets • Value Added Services Prepared by :Avani Trambadiya

What is global system for mobile communications?

The Global System for Mobile communications is a digital cellular communications system. It was developed in order to create a common European mobile telephone standard but it has been rapidly accepted worldwide. now: Global System for Mobile Communication.