Question: In a GSM network, when is the number of transmitted octets of EGPRS block on RLC layer acknowledged by mobile typically calculated for performance management purposes?
Option 1: Upon mobile initialization of an EGPRS session
Option 2: Periodically, at fixed intervals (e.g., every hour)
Option 3: When the BSS receives a PACKET UPLINK REQUEST from the mobile
Option 4: On receipt by the BSS of message PACKET DOWNLINK ACK for the transmitted EGPRS block on the RLC layer
Explanation: This is correct because, according to standard telecom practices and performance management principles, the acknowledgment of successful transmission (in this case, PACKET DOWNLINK ACK) triggers the calculation of transmitted data volumes. This ensures that only successfully received data is accounted for in performance metrics, reflecting reliable network throughput.