There are total eight time slots in all the frames and there is no dedicated slot to be usedīy the mobile station. To answer incoming paging call or to make a MO call. Mobile subscriber initially accesses a GSM BTS using an random access channel to perform location update,
As per requirement mobile will monitor received signal strength ofĦ neighbor BCCH carriers other than serving cell BCCH. Idle mode in mobile is normally exited to switch to dedicated mode when the Layer-1(physical layer) is configured by the upper Layer for either TCH or SDCCH.ĭuring Idle mode, GSM mobile will continue monitoring downlink signal strength of neighbor cells to ensure it is camped on to theīest available cell. Mobile does measurements on any of the IDLE frame except on PCH/PPCH channels,FCCH,SCH,CBCH, neighbour cell BCCHs, In the idle mode, GSM mobile receives the BCCH and CCCH channels from BTS,transmits RACH in case of MO call, does cell reselection and also the most This procedure is called cell reselection. It checks the signal strength and quality from the incoming broadcast channels from the camped on cell. Mobile runs a procedure periodically to check, whether it has been camped to the most suitable cell or not i.e. In this mode, it monitors the BTS paging channel for posibility of incoming call. Once the appropriate best cell is selected by mobile then and mobile is said to be camped to the respective BTS.Īfter camping GSM mobile enters into the idle mode. While in the dedicated mode, the resource is assigned to mobile to communicate with the BSS.
Also dedicated resource is also not assigned to it in the idle mode. In the idle mode mobileĭoes not involve in any form of communication. GSM RRC layer is used for signaling between the GSM network and MS. Radio Resource Control Procedure for the GSM mobile is outlined below. Initiate GPRS data connection to browse the internet. When we switch the mobile it will be in idle mode until we receive a call We will see what mobile does during these modes. There are two RRC states in GSM mobile subscriber station viz. On this page we will see RRC state diagram along with functions of all the states.
RRC falls on layer-3 of GSM mobile subscriber. This tutorial section on GSM basics covers following sub topics: Main Page Frame Burst types PHY gsm stack speech processing ARFCN Channel types GSM Security Network Entry Mobile basics
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