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It is also possible for a single handset/phone to be simultaneously connected to multiple RANs. Handsets capable of this are sometimes called dual-mode handsets. For instance it is common for handsets to support both GSM and UMTS (a.k.a. "3G") RATs. Such devices seamlessly transfer an ongoing call
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between different radio access networks without the user noticing any disruption in service.
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residing in both the core network as well as the user equipment. See the following diagram:
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CN / ⧵ / ⧵ RAN RAN / ⧵ / ⧵ UE UE UE UE
139:(RAT). Conceptually, it resides between a device such as a
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109:Learn how and when to remove this message
307:"What is a Radio Access Network (RAN)?"
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