What are the types of channels in GSM?

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).

How many traffic channels are available in GSM?

GSM has two types of traffic channels TCH/FS and TCH/HS. It is used both in the uplink and downlink after mobile has established connection with the GSM cell (BTS).

Which dedicated channel is used during handover in GSM?

SDCCH: Stand alone dedicated control channel, used for call setup. SACCH: Slow associated control channel, is used for control and supervisory signals associated with the traffic channels. FACCH: Fast associated control channel, is used for control requirements such as handoff/handovers.

What is physical and logical channels in GSM?

GSM uses a variety of ‘channels’ in which the data is carried. In GSM, these channels are separated into physical channels and logical channels. The Physical channels are determined by the timeslot, whereas the logical channels are determined by the information carried within the physical channel.

What is TCH traffic?

TCH (Traffic channel) congestion is one of the key performance indicators (KPI) which influence the network performance and customer satisfaction in live GSM network The degree of TCH congestion in the network results in large number of TCH blocking which greatly affects the subscriber satisfaction and revenue of the …

What is difference between logical and physical channel?

The Physical channels are determined by the timeslot, whereas the logical channels are determined by the information carried within the physical channel. These channels may either be used for user data (payload) or signalling to enable the system to operate correctly.

What are the basic reasons for handover in GSM?

GSM Handover Causes | GSM Handover Triggers This occurs when neighbour cell signal level becomes more than serving cell to the value of about 3 to 6 dB. Intracell Handover: When the assigned time slot/frequency is interfered then handover is initiated after assigning new channel or TSL.

What are the different types of GSM channels?

It also covers GSM noncombined channel configuration (51 frame multiframe) and GSM combined channel configuration (51 frame multiframe). There are two main types of GSM channels viz. physical channel and logical channel . Physical channel is specified by specific time slot/carrier frequency.

How are physical channels and logical channels determined in GSM?

In GSM, these channels are separated into physical channels and logical channels. The Physical channels are determined by the timeslot, whereas the logical channels are determined by the information carried within the physical channel.

What is the function of the SDCCH channel in GSM?

Function not clear in the present version of GSM (could be used for e.g. handover of an eight-rate channel, i.e. using a “SDCCH-like” channel for other purposes than signalling). SACCHs SDCCH in-band signalling, e.g. for link monitoring.

Which is the return common channel in GSM?

The return common channel is a random access channel used by the mobile to request channel resources before timing information is conveyed by the BSS. The dedicated channels are of two main types: those used for signalling, and those used for traffic.