What is Use of LAC in GSM What is Use of LAC in GSM Location Area Code（LAC) : To locate the location of MS, the whole area covered by each GSM PLMN is divided into different location areas. LAC is used to identify different location areas. LAI contains LAC, which is composed of two bytes. … Read more
What is MNC and MCC for GSM MCC MNC – Telecom What is mcc and mnc :- Both are very first question in your mind when you start learning on telecom its basic behind numbering system in telecom lets understand each one in details. MNC full form in telecom : Mobile Network Code. MCC full form in telecom … Read more
What is Network Identity Parameter CGI in GSM In GSM, the Network Identity Parameter CGI (Cell Global Identity) is a code that uniquely identifies a specific cell in a mobile network. It comprises the Mobile Country Code (MCC), Mobile Network Code (MNC), Location Area Code (LAC), and Cell Identity (CI). The CGI helps in identifying … Read more
Timing Advance in GSM Transmission delay is unavoidable in the radio interface. If the mobile station moves away from the base station during a call, the further distance the more delay. The uplink is as the same. If the delay is too high, the timeslots of the signal from a certain mobile station and that … Read more
How Voice Signal Processing in GSM The radio channel is quite different from the wired channel. First, the radio channel has a distinct time-change characteristic. The radio channel is exposed to the air, so it is vulnerable to the interferences in the air. The signal is influenced by various interferences, multi-path fading and shadow fading, … Read more
The first layer is the physical layer, which is marked as L1 and is the lowest layer. This layer provides the radio link needed in transmission of bit stream. It defines the radio access capability of the GSM system and provides the most fundamental radio channel (logical channel) for the information transmission of higher-layer , … Read more
BCH,CCCH and DCCH Channel of GSM BCH (Broadcast Channels) BCCH(Broadcast Control Channels) Downlink Only. Broadcast information of the serving cell (System Information). Transmitted on timeslot zero of BCCH carrier. Read only by idle mobile at least once every 30 secs. SCH (Synchronization Channels) Downlink Only Carries information for frame synchronization. Contains frame number and BSIC … Read more
Basic of GSM Um,Abis and A Interface GSM (Um) Air Interface This is the interface between the GSM mobile station and the GSM Base station. The Air interface (RF Interface) uses the Time Division Multiple Access (TDMA) technique to transmit and receive traffic and signaling information between the GSM BTS and GSM Mobile Station. The … Read more
If it is available, the second cell site returns the Walsh Code that will be assigned for the soft handoff. At this point, the original base station orders the soft handoff by using a handoff direction message on the traffic channel using one of the two types of signaling: dim and burst or blank and … Read more
Once a call is established, the mobile is constantly searching for other possible cell sites that might be good candidate for soft handoffs. Most of the search time is limited to looking for those PN offsets specified in the neighbor list found on the paging channel. The rake receiver’s searcher is the device that scans … Read more