Adaptive muting ratio in enhanced Inter-Cell Interference Coordination for LTE-A systems (original) (raw)

In recent years, we have witnessed a rapid evolution of wireless communication technologies to meet the ever increasing demand of diversified mobile services. It is expected that mobile traffic volume will continue to increase in the following years with a massive diffusion of connected devices and a wide range of quality of service requirements. This represents a challenge for future wireless systems, which shall guarantee high-quality and high-data rate services into limited spectrum. OFDMA femtocells have been pointed out by the industry as a good solution not only to overcome the indoor coverage problem but also to deal with the growth of traffic within macrocells. However, the deployment of a new femtocell layer may have an undesired impact on the performance of the macrocell layer. The resource allocation and the avoidance of electromagnetic interference are some of the more urgent challenges that operators face before femtocells become widely deployed. Following the primary/secondary paradigm, low power nodes shall have cognitive capabilities in order to monitor the network status and optimize their transmission reducing the interference to the primary licensed system. Otherwise, some types of coordination are often used to manage each transmission and to avoid that set of issues. This is possible when both systems are aware of the presence of the other transmission point and a control channel is available to each other. The use of multiple antennas for wireless communication systems has gained overwhelming interest during the last decade-both in academia and industry. Multiple antennas can be utilized in order to accom