Question: In A/Gb mode, when a GPRS MS (Mobile Station) is in the READY state and uses Discontinuous Reception (DRX), what must the SGSN (Serving GPRS Support Node) consider when assigning a packet data channel for downlink transfer?
Option 1: The MS's current location area
Option 2: The MS's QoS (Quality of Service) profile
Option 3: The DRX parameters indicated by the MS
Option 4: The number of active PDP contexts
Explanation: In A/Gb mode, when a GPRS Mobile Station (MS) is in the READY state and utilizes Discontinuous Reception (DRX), the Serving GPRS Support Node (SGSN) must take into account the DRX parameters specified by the MS. This is crucial for efficiently assigning a packet data channel for downlink transfers, ensuring that data is transmitted during the MS's active reception periods, thus optimizing network resource utilization and minimizing unnecessary transmissions.