Refer to ETSI TS 102 250-2 V2.2.1 (2011-04) Page 225 SMS Completion Ratio Definition: The SMS Completion Ratio is the ratio of successfully received and sent messages from the sending user equipment to the receiving user equipment, excluding duplicate received and corrupted messages. Equation: Where: Refer to ETSI TS 102 250-2 V2.2.1 (2011-04), Page 228 Note 4: A corrupted SMS is an SMS with at least one bit error in its message part SMS End-to-End Delivery Time [s] Definition: The SMS end-to-end delivery time is the time period between sending a short message to the network and receiving the very same short message at another UE. Equation: Refer to ETSI TS 102 250-2 V2.2.1 (2011-04), Page 230 DATA SERVICE Attach failure ratio Definition: The attach failure ratio denotes the probability that a subscriber cannot attach to the PS network. Equation: ETSI TS 102 250-2 V2.2.1 (2011-04) Attach Setup time Definition:The attach setup time describes the time period needed to attach to the PS network Equation: ETSI TS 102 250-2 V2.2.1 (2011-04) PDP Context Activation Failure Definition:The PDP context activation failure ratio denotes the probability that the PDP context cannot be activated. It is the proportion of unsuccessful PDP context activation Regulations for Quality of Service of Cellular Mobile and Fixed Networks Services (Voice ,SMS and 3G Data Services ) 13