Call area restriction

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This post highlights the call area restriction. Please have a look at the information below.


Overview


  • During dispatching in a trunked radio system, each dispatcher manages a specific area. With the call area restriction function, a dispatcher can call mobile subscribers only in the managed area. This prevents the dispatcher from sending instructions to incorrect subscribers.


  • Call area restriction applies only to point-to-point calls.


Service flow


  • The MSC determines whether to restrict calls in the current call area where the calling MS is located by checking the data configuration list.


  • There are two types of call area restriction procedures:

a) VLR-based call area restriction;


b) Cell-based call area restriction.


VLR-based call area restriction


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1. During point-to-point calls, the originating MSC server sends a route information request to the HLR, and the HLR returns the route information.

2. The originating MSC server queries the data configuration in the database using the number of the calling dispatcher and the roaming number returned by the HLR. Based on the queried configuration, the originating MSC server determines whether the dispatcher can dispatch subscribers in the VLR area where the called MS is located.


3. If the dispatcher is not allowed to dispatch subscribers in the VLR area where the calling MS is located, the originating MSC server releases the call with the cause value of call reject.


4. If the dispatcher is allowed to dispatch subscribers in the VLR area where the calling MS is located, the originating MSC server sends an IAM message to the terminating MSC server and continues to process the call. 


Cell-based call area restriction


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1. During point-to-point calls, the MSC sends a paging request to the called MS, and the called MS returns a paging response message.


2. The MSC queries the data configuration in the database using the number of the calling dispatcher and the cell information in the paging response message and then determines whether the dispatcher can dispatch subscribers in the cell.


3. If the dispatcher is not allowed to dispatch subscribers in the cell, the originating MSC server releases the call with the cause value of call reject. If the dispatcher is allowed to dispatch subscribers in the cell, the MSC sends a SETUP message to the called MS and continues to process the call.


  • x
  • convention:

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