< BK21 플러스 BEST 정보기술 사업단 세미나 개최 안내 >

개최일시 : 2016년 01월 04일 월요일 09:00 ~ 10:00

개최장소 : 공학원 제 4세미나실

세미나 제목 : Assessment of LTE Wireless Access for Monitoring of Energy Distribution in the Smart Grid

발표초록 :

While LTE is becoming widely rolled out for human-type services, it is also a promising solution for cost-efficient connectivity of the smart grid monitoring equipment. This is a type of machine-to-machine (M2M) traffic that consists mainly of sporadic uplink transmissions. In such a setting, the amount of traffic that can be served in a cell is not constrained by the data capacity, but rather by the signaling constraints in the random access channel and control channel. In this talk it is explored that these limitations using a detailed simulation of the LTE access reservation protocol (ARP). It is found that 1) assigning more random access opportunities may actually worsen performance; and 2) the additional signaling that follows the ARP has very large impact on the capacity in terms of the number of supported devices; a reduction in the capacity is almost a factor of 3. This suggests that a lightweight access method, with a reduced number of signaling messages, needs to be considered in standardization for M2M applications. Additionally a tractable analytical model is proposed to calculate the outage that can be rapidly implemented and evaluated. The model accounts for the features of the random access, control channel and uplink and downlink data channels, as well as retransmissions.

강연자 : Dong Min Kim, Postdoctoral Researcher / Aalborg University, Denmark

초청자 : 전기전자공학과 교수 김성륜