Abstract View

Optimal Deployment of Assisting Cells for Multimedia Push in Single Frequency Network

Long term evolution (LTE) systems are equipped deliberately with the multimedia broadcast/multicast service over a single frequency network (MBSFN) to save transmitting resources. With the usage of assisting cells in MBSFN transmission, there is a significant effect on raising spectral efficiency (SE), and energy efficiency (EE) may be promoted synchronously. In this paper, we propose a circle model to approximate the SE in a hexagonal user equipment (UE) drop area for analysis. Based on themodel, the optimal allocating scheme of assisting cells with a certain number is presented. Both in theory and simulation, the SE is changed nonlinearly while increasing the number of assisting cells under the optimal allocating scheme. Evaluated by EE, it is proved that the optimal deployment of assisting cells is shown as a number of assisting rings, and the optimal number of assisting rings is related to the size of hexagonal UE drop area. Compared with nonuse of assisting cells, there is a significant improvement on EE as the optimal deployment configured, and the EE gains with different sizes of hexagonal UE drop areas are shown in simulation.