LTE, LTE-Advanced and WiMAX: Towards IMT-Advanced Networks

Power Management

Great emphases have been made on power management in the IMT-Advanced requirements in order to reduce the MS power demands. By looking at the above technologies, it can be readily noted that this has been addressed in more than way. For example, replacing OFDMA by SC-0FDMA in the LTE-Advanced UL was made to improve the efficiency of the MS power amplifier. Moreover, the various coverage enhancement technologies, that is, RSs, femtocells, and CoMP, tend to reduce the UL power consumption. In addition, the use of the advanced multiple antenna techniques—through improving the overall interference management—reduces the MSs power expenses when combating rough medium conditions.

However, the standards are also exploiting advances in electronics and RF circuit design through revised definition for MS states in addition to improved scheduling and polling mechanisms. And while the requirements for idle-to-connected duration have been substantially shortened in the requirements for IMT-Advanced networks, they are easily handled by the state-of-the-arty circuit technologies. Furthermore, measures are mode of managing the mobility and cell selection of devices in idle or sleep mode, that is, devices will not require extensive signaling to switch cells while in idle states.