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![Wireless data communication technologies [4]: GSM/UMTS Network. | Download Scientific Diagram](https://www.researchgate.net/profile/Christof-Roehrig/publication/224085459/figure/fig2/AS:669070009585671@1536530129352/Wireless-data-communication-technologies-4-GSM-UMTS-Network.png "Wireless data communication technologies [4]: GSM/UMTS Network. | Download Scientific Diagram")
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![GSM network structure [4]. | Download Scientific Diagram](https://www.researchgate.net/publication/309363010/figure/fig1/AS:419978558885892@1477142099316/GSM-network-structure-4.png "GSM network structure [4]. | Download Scientific Diagram")
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