Voronoi cell geometry based dynamic Fractional Frequency Reuse for OFDMA cellular networks. - Rahat Ullah; Norsheila Fisal; Hashim Safdar; Wajahat Maqbool; Zubair Khalid; Adnan Shahid Khan (ICSIPA, 2013)

Distributed resource allocation for spatially distributed irregular cells. - Hashim Safdar; Norsheila Binti Fisal; Rahat Ullah (ISTT, 2014)

Fractional frequency reuse for irregular cell geometry OFDMA systems. - Rahat Ullah; Norsheila Fisal; Hashim Safdar (ISTT, 2014)

Sensor virtualization Middleware design for Ambient Assisted Living based on the Priority packet processing. - Zubair Khalid; Usman Khalid; Mohd Adib Sarijari; Hashim Safdar; Rahat Ullah; Mohsin Qureshi; Shafiq Ur Rehman (ANT/EDI40, 2019)

Irregular Geometry Based Sectored FFR Scheme for ICI Mitigation in Multicellular Networks. - Rahat Ullah; Hanif Ullah; Zubair Khalid; Hashim Safdar (J. Commun., 2020)