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Option 3 uses the MN terminated MCG bearer for signalling. There are a few variants for data bearer configuration within Option 3. The industry main-stream is to use an SN-terminated split bearer (sometimes referred to as “Option 3x”). This variant has low impact on EPC and enables data to route directly to the NR gNB to avoid excessive user plane load on the existing LTE eNB, which was design...
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