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Example 4.5 Piggybacking of GSM Air Interface Complete Layer 3 Information Using SCCP
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In the case of the GSM system, the SS7 protocol stack is used to exchange messages between the GSM and the MSC over the A‐interface. The Signaling Connection Control Part (SCCP) layer is a part of the SS7 protocol stack. GSM Complete Layer 3 Information is used to transport all the initial signaling connection messages, between the MS and MSC, piggyback with the SCCP protocol message. Examples of GSM system initial messages are – CM SERVICE REQUEST, which is used for a mobile originated call, LOCATION UPDATE REQUEST, which is used for location area update request from MS to the CN, etc.
