Abstract: With sharply increased number of smart phone in current radio communication networks, there are wide varieties of data applications, of which the ratio of small data applications is increasing. Large problems to LTE systems in network efficiency and user experience were introduced. Due to the design principle of LTE is for high data rate, it is necessary to enhancement the ability of the networks to support small data applications. The discussion was based on the study of eDDA in 3GPP LTE R11. Firstly, the impacts of small data applications to LTE networks were illustrated. Then, it was discussed that discontinued reception and setting of RRC states transition were two of the most important techniques to improve the network ability. The possible further eDDA researches in LTE R12 work were also introduced at last.