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Mobile Originated Call (MOC)

1. The MS uses RACH to ask for a signaling channel.

2. The BSC allocates a signaling channel, using AGCH.

3. When the channel is allocated, it sends its IMSI and VLR is signed as busy.

4. The MS sends a call set-up request via SDCCH to the MSC/VLR. Over SDCCH all signaling preceding a
call takes place. This includes:

             Marking the MS as “active” in the VLR

             The authentication procedure

             Start ciphering

            ■       Equipment identification

             Sending the called party’s number to the
              network

             Checking if the subscriber has the service
              “Barring of outgoing calls” activated

5. The MSC/VLR instructs the BSC to allocate an idle TCH. The BTS and MS are told to tune to the TCH.

6. The MSC/VLR forwards the called party number to an exchange in the PSTN, which establishes a
connection to the subscriber.

7. If the called subscriber answers, the connection is established.
Mobile Terminated Call (MTC)

1: calling a GSM subscriber

2: forwarding call to GMSC

3: signal call setup to HLR

4, 5: request MSRN from VLR

6: forward responsible MSC to GMSC

7: forward call to current MSC

8, 9: get current status of MS

10, 11: paging of MS

12, 13: MS answers

14, 15: security checks
16, 17: set up connection

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Moc mtc

  • 1. Mobile Originated Call (MOC) 1. The MS uses RACH to ask for a signaling channel. 2. The BSC allocates a signaling channel, using AGCH. 3. When the channel is allocated, it sends its IMSI and VLR is signed as busy. 4. The MS sends a call set-up request via SDCCH to the MSC/VLR. Over SDCCH all signaling preceding a call takes place. This includes:  Marking the MS as “active” in the VLR  The authentication procedure  Start ciphering ■ Equipment identification  Sending the called party’s number to the network  Checking if the subscriber has the service “Barring of outgoing calls” activated 5. The MSC/VLR instructs the BSC to allocate an idle TCH. The BTS and MS are told to tune to the TCH. 6. The MSC/VLR forwards the called party number to an exchange in the PSTN, which establishes a connection to the subscriber. 7. If the called subscriber answers, the connection is established.
  • 2. Mobile Terminated Call (MTC) 1: calling a GSM subscriber 2: forwarding call to GMSC 3: signal call setup to HLR 4, 5: request MSRN from VLR 6: forward responsible MSC to GMSC 7: forward call to current MSC 8, 9: get current status of MS 10, 11: paging of MS 12, 13: MS answers 14, 15: security checks
  • 3. 16, 17: set up connection