Downlink Scheduling and Power Allocation in Cognitive Femtocell Networks

• Published in: Cognitive Radio Oriented Wireless Networks Vol. 156; pp. 92 - 105
• Main Authors: Elmaghraby, Hesham M., Qin, Dongrun, Ding, Zhi
• Format: Book Chapter
• Language: English
• Published: Switzerland Springer International Publishing AG 2015; Springer International Publishing
• Series: Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering
• Subjects: Cognitive femtocell; Communications engineering / telecommunications; COMPUTER COMMUNICATIONS & NETWORKING; Cross-tier interference; Outage constraint; Power allocation; Resource assignment
• ISBN: 3319245392; 9783319245393
• ISSN: 1867-8211; 1867-822X
• DOI: 10.1007/978-3-319-24540-9_8

We consider resource assignment and power allocation problem in femtocells under channel estimation errors. Our formulation is to maximize the throughput of femtocell users that share spectrum resources with macrocell base station (MBS) while limiting interference between macrocell and femtocells. Using cognitive capabilities, femtocell basestations (FBS) can acquire the needed information about the neighboring MBS users to reduce cross-tier interference between FBS and MBS users. We analyze the distributions of signal to interference and noise ratio (SINR) of MBS users and signal to interference ratio (SIR) of FBS users. Based on the analytical results, we present resource assignment and power allocation solutions to maximize the mean sum rate subject to SINR and SIR outage constraints, along with simulation verifications.