The incoming call is passed from the fixed network to the gateway MSC (GMSC).
Then, based on the IMSI numbers of the called party, its HLR is determined. The HLR checks for the existence of the called number. Then the relevant VLR is requested to provide a mobile station roaming number (MSRN).
This is transmitted back to the GMSC.Then the connection is through from GMSC to the responsible MSC.Now the MSC queries the VLR for the location range and reachability status of the mobile subscriber. If the MS is marked reachable, VLR asks the MSC to go ahead with necessary paging message. MSC asks the BSC for the same, then the BSC asks the BTS to send a paging message Then the particular mobile subscriber telephone responds to the page request through RACH. This will be forwarded to the BSC and MSC. SDCCH will be provided through AGCH by the BSC with the instructions from MSC. SDCCH handles all necessary security procedures like authentication, IMEI check etc. If this is successful, the VLR indicates to the MSC to go ahead with the call. The traffic channel will be provided and the call can be completed.
 
The incoming call is passed from the fixed network to the gateway MSC (GMSC).Then, based on the IMSI numbers of the called party, its HLR is determined. The HLR checks for the existence of the called number. Then the relevant VLR is requested to provide a mobile station roaming number (MSRN).This is transmitted back to the GMSC.Then the connection is through from GMSC to the responsible MSC.Now the MSC queries the VLR for the location range and reachability status of the mobile subscriber. If the MS is marked reachable, VLR asks the MSC to go ahead with necessary paging message. MSC asks the BSC for the same, then the BSC asks the BTS to send a paging message Then the particular mobile subscriber telephone responds to the page request through RACH. This will be forwarded to the BSC and MSC. SDCCH will be provided through AGCH by the BSC with the instructions from MSC. SDCCH handles all necessary security procedures like authentication, IMEI check etc. If this is successful, the VLR indicates to the MSC to go ahead with the call. The traffic channel will be provided and the call can be completed.
การแปล กรุณารอสักครู่..
