Journal of Intelligent Computing Milica Jovanovic, Igor Stojanovic, Sandra Djosic, Goran Lj Djordjevic 11 4 2020 https://doi.org/10.6025/jic/2020/11/4/119-124 https://www.dline.info/jic/fulltext/v11n4/jicv11n4_1.pdf The local indoor localization system has a set of anchor nodes for which we presented a MAC layer protocol. It can able to fix the issues of providing a range of data from the mobile tag to the location server through the multi-hop sink-tree network of anchor nodes. This system ensures regularity of the process of network formation and employs a TDMA scheme wherein each anchor node is statically assigned a time slot for ranging and data forwarding, thereby avoiding collisions and improving system scalability.