Table of Contents
What is common control channel in GSM?
The Common Control Channel (CCCH) is responsible for transferring control information between all mobiles and the BTS. This is necessary for the implementation of “call origination” and “call paging” functions.
What is dedicated control channel?
Dedicated control channel (DCCH): A point-to-point bidirectional channel that transmits dedicated control information between a UE and the network. It is used by UEs that have RRC connection. The traffic channels are exclusively used for the transfer of user-plane information.
Which GSM burst carries traffic channels and all types of control channels?
The diagram below shows the five types of burst employed in the GSM air interface. All bursts, of whatever type, have to be timed so that they are received within the appropriate timeslot of the TDMA frame. The normal burst carries traffic channels and all types of control channels.
What is paging in GSM?
IMSI paging procedure in GSM: the paging request message is sent on a common radio channel and contains the long-term identity of the paged mobile station IMSI in cleartext. The paging response message also contains the IMSI and is sent in clear on a dedicated channel.
What is BCCH in 2g?
The Broadcast Control CHannel (BCCH) is a logical broadcast channel used by the basestation in a GSM network to send information about the identity of the network. This information is used by a mobile station to get access to the network.
What is TCH in 2g?
TCH stands for a traffic channel in GSM. This article describes the GSM traffic channel. Traffic channel carries digitally encoded user data or user speech on the forward and reverse link.
What is Sacch in GSM?
Slow Associated Control Channel. A GSM signalling channel that provides a relatively slow signalling connection. The SACCH is associated with either a traffic or dedicated channel. The SACCH can also be used to transfer SMS (Short Message Service) messages if associated with a traffic channel.
How many types of burst are there in GSM?
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). Eight of these burst periods are grouped into what is known as a TDMA frame.
What is Lac 3G update?
The location update procedure allows a mobile device to inform the cellular network whenever it moves from one location area to the next. Mobiles are responsible for detecting location area codes (LAC).
What is location area in GSM?
Location Area (LA) A GSM network is divided into cells. A group of cells is considered a location area. A mobile phone in motion keeps the network informed about changes in the location area.
What is Sdcch in 2g?
Standalone Dedicated Control Channel. This channel is used in the GSM system to provide a reliable connection for signalling and SMS (Short Message Service) messages. The SACCH (Slow Associated Control Channel) is used to support this channel.
What is TCH availability?
• TCH Availability Rate: It is the number of TCH. available divided by maximum number of TCH. channels possible for carrying traffic.
What is TCH 2g?
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). It uses 26 frame multi frame structure. TCH/FS stands for traffic channel at Full rate speech and TCH/HS stands for traffic channel at half rate speech.
What is FCCH Telecom?
FCCH stands for Frequency Correction Channel. It is a downlink-only control channel in the GSM Um air interface. The FCCH burst, defined in GSM 05.02 section 5.2. 4, is an all-zero sequence that produces a fixed tone in the GMSK modulator output.
What is GSM burst?
This GSM burst structure is used to ensure that it fits in the time slot regardless of any severe timing problems that may exist. Once the mobile has accessed the network and timing has been aligned, then there is no requirement for the long guard period.
What is access burst?
Access Burst: . It is used to send the Random Access Channel (RACH) information – RACh contains the first message from MS to BTS. . It has a long guard period to allow BTS to calculate the Ms distance from the BTS and to provide timing advance information to MS. 3) Frequency Correction Burst (FCCH):
What is a CBCH on a cell phone?
Cell Broadcast Channel (CBCH) This channel is used to transmit messages to be broadcast to all MS’s within a cell. The CBCH uses a dedicated control channel to send its messages, however it is considered a common channel because all mobiles in the cell can receive the messages.
What is The CBCH control channel?
The CBCH uses a dedicated control channel to send its messages, however it is considered a common channel because all mobiles in the cell can receive the messages. Active MS’s must frequently monitor both BCCH and CCCH.
What is GSM Common Control Channel (CCCH)?
This page describes GSM Common Control Channel (CCCH). GSM CCCHs (Common Control Channels) are used for conveying information from network to the Mobile Subscribers (MSs) and provide access to the Mobile Subscribers. GSM CCCHs include PCH,RACH,AGCH and CBCH.
What is the difference between BCCH and sch in GSM?
SCH: synchronization channel, this carry BSIC (Base transceiver station identity code) and Frame number which helps MS tune to specific (Frequency,Ts) physical slot on TDMA frame in GSM network. BCCH: Broadcast control channel, carry CGI,MNC,MCC which is received by MS.