Question: What is the primary objective of the Path Switch Request procedure in the Evolved Universal Terrestrial Radio Access Network (E-UTRAN)?
Option 1: To initiate a handover from one E-UTRAN cell to another without changing the serving gateway.
Option 2: To establish a new S1-U interface for user plane data transmission between eNodeB and Serving Gateway.
Option 3: To set up a UE-associated signalling connection with the Evolved Packet Core (EPC) and potentially switch the downlink GTP tunnel endpoint.
Option 4: To release existing UE contexts from the MME due to inactivity or handover to a non-LTE network.
Explanation: The correct answer aligns with the purpose of the Path Switch Request procedure, which is two-fold: (1) establishing a signalling connection between the UE and the EPC for control plane communications, and (2) if necessary, requesting a switch in the downlink GTP tunnel endpoint, ensuring seamless communication and data routing adjustments within the network.