What is SCH in GSM?

What is SCH in GSM?

SCH stands for synchronization channel. It uses SB (synchronization burst). SCH carry frame number and BSIC (Base Station Identity Code) which helps Mobile synchronize with GSM frame structure as well as helps in identification of the Base station in the GSM network.

What are the types of channels in GSM?

In GSM logical channels (see Figure 7.4) are used to carry traffic and control information. There are three types of logical channels: traffic channels (TCHs), control channels (CCHs), and the cell broadcast channel (CBCH). The traffic channels are used to transmit user information (speech or data).

What is burst in GSM?

GSM slot structure and multiple access scheme GSM uses a combination of both TDMA and FDMA techniques. The slot is then the time that is allocated to the particular user, and the GSM burst is the transmission that is made in this time. Each GSM slot, and hence each GSM burst lasts for 0.577 mS (15/26 mS).

What is the function of Fcch and SCH in GSM?

FCCH is mainly provided in the GSM frame for synchronization purpose between BTS and GSM Mobile. It is a downlink channel and carry continuous wave signal which helps mobile find the frequency offset between BTS and MS.

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 forward channel?

forward channel: The channel of a data circuit that transmits data from the originating user to the destination user. Note: The forward channel carries message traffic and some control information.

What is TCH availability?

information & signalling. • TCH Availability Rate: It is the number of TCH. available divided by maximum number of TCH. channels possible for carrying traffic.

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.

What is the duration of guard time in GSM?

Introduction. 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 Fcch in GSM?

The Frequency Correction Channel is a broadcast channel used by GSM base stations. It provides a unique tone of 67.7 kHz for the Mobile Stations. This tone is used to synchronize the local clock of the mobile receiver with the base station.

What is the use of SCH channel in GSM?

Synchronization Channel is a downlink only control channel used in GSM cellular telephone systems. It is part of the Um air interface specification. The purpose of the SCH is to allow the mobile station (handset) to quickly identify a nearby cell (a BTS ) and synchronize to that BTS’s TDMA structures.

What is channel synchronization channel (SCH)?

(C) Synchronization CHannel (SCH) : SCH provides information to the mobile station (MS). With the help of this information, mobile station (MS) searches the base station. Within particular cell the MS needs to synchronize to the time-structure, and also ensure that the chosen BTS is a GSM base station.

What are the GSM channels in mobile network?

There are various control channels such as BCCH (Broadcast control channel), SCH (synchronous channel), FCCH ( Frequency control channel), DCCH (Dedicated control channel). All these gsm channels help maintain GSM network and also helps GSM mobile phone connect to GSM network and maintain the connection and help tear down the connection.

What is the difference between SCH and BSIC in GSM?

SCH carry frame number and BSIC (Base Station Identity Code) which helps Mobile synchronize with GSM frame structure as well as helps in identification of the Base station in the GSM network. SCH is carried in 51 frame multi frame structure and it follows the FCCH in the GSM TDMA frame.