Energy-efficient device-differentiated cooperative adaptive multimedia delivery solution in wireless networks

A Practical Framework for Energy-Efficient Node Activation in Heterogeneous LTE Networks

“…The interference of a micro is, by and large, negligible outside its own hexagon. This means that, if switching on a micro succeeds in offloading the macro of some RBs, then the effects on overload at large, that is, in the whole network, can only be beneficial, since the intercell interference which is mainly due to the macro will be reduced through (4). Unless micros are misplaced, it is usually true that switching on a micro offloads the macro of some RBs and that the overload probability in a hexagon decreases when the micros are switched on.…”

“…However, RBs allocated at the micro are normally cheaper than those at the macro, since < , where subscripts and superscripts are self-explanatory. When a micro is switched on, and some UE switches from the macro to the micro, there is a global decrease of intercell interference through (4), which is also beneficial energy-wise. From the above, we obtain that keeping a micro on for very few allocated RBs is inefficient.…”

“…(1) iteration = 0 (2) While (interfChanges or iteration > It max ) (3) resetAllocation() (4) for each hexagon i (5) for each UE u in i (6) if(itearation < It) // Assoc. Ph.…”

“…The average SINR of each UE is computed through (4). Note that there is a circular dependence between the SINR and the RBs allocated to a UE.…”

“…As far as cellular networks are concerned, energy efficiency in LTE networks has been the subject of several studies. Leaving aside those that investigate battery saving at the user side (e.g., [2][3][4]), many works concentrate on the infrastructure side, which is where energy consumption meets OPEX (see, e.g., [5][6][7][8][9] and the references therein and again [10][11][12][13][14][15][16][17][18]).…”