Question: What is the primary benefit of combining multiple Global Navigation Satellite Systems (GNSS) and regional navigation systems for a User Equipment (UE) in an E-UTRAN?
Option 1: Reduced handset power consumption due to simplified signal processing
Option 2: Enhanced security through diversified signal sources
Option 3: Increased dependency on network assistance for positioning
Option 4: Improved availability, reliability, and accuracy of satellite signals in various environments
Explanation: Combining multiple GNSS and regional navigation systems increases the effective number of navigation satellite signals. This enhancement leads to improved availability (more satellites visible at a particular location), increased reliability (better identification of measurement outliers due to data redundancy), and enhanced accuracy (due to improved measurement geometry and modernized ranging signals). These benefits are crucial for UEs operating in diverse environments, such as urban canyons where satellite signal obstruction is common.