lincolndsp said:How many HLRs can be in a GSM operator's network,
how and which HLR is chosen to store the Mobile Subscriber's
data, does the HLR change in the process of movement?
lincolndsp said:Dear ibrahimsayed, so why do many books
about Gsm show a pair of HLR and VLR
connected to each MSC. So the books are
pretty incorrect?
lincolndsp said:How many HLRs can be in a GSM operator's network,
how and which HLR is chosen to store the Mobile Subscriber's
data, does the HLR change in the process of movement?
ibrahimsayed said:lincolndsp said:How many HLRs can be in a GSM operator's network,
how and which HLR is chosen to store the Mobile Subscriber's
data, does the HLR change in the process of movement?
Dear amihomo
the number of HLRs are determined according to the dimensioning of the network which is done a the first phase of the network implementation,and so it depends on the number of subscribers the network expects to serve and the capacity of the HLR itself as HLR is just a storage mdium for different database of all subscribers at the network,so if the number of subscribers exceeds the capacity of one HLR we will need more HLRs to serve the subscribers,thus the number of HLR at the system depends on the number of subscribers it will seve and the HLR capacity.any way if there are more than one HLR they are connected together to become as one HLR,so it doesn't matter how many HLRs i have at the network as they are connected together as one HLR and so the data of the subscribers can be stored at any one as the most important thing is to restore the data of the subscribers when we need that.At the process of movement,the data at the HLR will not change at all as it is a fixed data,but the data at VLR may change.
Best Regards
Ibrahim Sayed
amihomo said:ibrahimsayed said:lincolndsp said:How many HLRs can be in a GSM operator's network,
how and which HLR is chosen to store the Mobile Subscriber's
data, does the HLR change in the process of movement?
Dear amihomo
the number of HLRs are determined according to the dimensioning of the network which is done a the first phase of the network implementation,and so it depends on the number of subscribers the network expects to serve and the capacity of the HLR itself as HLR is just a storage mdium for different database of all subscribers at the network,so if the number of subscribers exceeds the capacity of one HLR we will need more HLRs to serve the subscribers,thus the number of HLR at the system depends on the number of subscribers it will seve and the HLR capacity.any way if there are more than one HLR they are connected together to become as one HLR,so it doesn't matter how many HLRs i have at the network as they are connected together as one HLR and so the data of the subscribers can be stored at any one as the most important thing is to restore the data of the subscribers when we need that.At the process of movement,the data at the HLR will not change at all as it is a fixed data,but the data at VLR may change.
Best Regards
Ibrahim Sayed
hi dear ibrahimsayed
you are right.
I meant the same as you said. but maybe I couldn't clarify what I meant
Each mobile phone has a home location register (HLR) and a visitor location register (VLR) assigned to it. The HLR contains information such as the identity of the user and phone number assigned to the user in the user’s home network, the services to which the user has subscribed, whereas the VLR contains information about the mobile phone when it is used outside the home network. So when a mobile phone initiates a call, it sends the information to the BTS about its identity and so on from the VLR or the HLR depending on the location of the phone at the time the call originates. The mobile switching center checks the data from its HLR or VLR to authenticate the call and gives permission for the phone to access the network. As the caller moves within the cell, the BTS monitors the strength of the signal between the phone and the receiver, and if this falls below a certain level, it may transfer control of the phone to the BTS in the next cell, which may offer a stronger signal. If no such cell is nearby, the caller is cut off (i.e., will not be able to receive or to send a call). As the caller moves from one cell to another cell, the BTS serving it will transfer control to the BTS in the cell that it has moved to.
regards
amihomo said:hi dear ibrahimsayed
again, you are right
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