The success of LTE Heterogeneous Networks (Het-Nets) with macro cells and pico cells critically depends on efficient spectrum sharing between high-power macros and lowpower picos. Two important challenges in this context are, (i) determining the amount of radio resources that macro cells should offer to pico cells, and (ii) determining the association rules that decide which UEs should associate with picos. In this paper, we develop a novel algorithm to solve these two coupled problems in a joint manner. Our algorithm has provable guarantee, and furthermore, it accounts for network topology, traffic load, and macro-pico interference map. Our solution is standard compliant and can be implemented using the notion of Almost Blank Subframes (ABS) and Cell Selection Bias (CSB) proposed by LTE standards. We also show extensive evaluations using RF plan from a real network and discuss SON based eICIC implementation.

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enhancements are similar in concept to those incorporated in third generation cellular standards such as CDMA2000* high rate packet data (HRPD) [4] or the high speed downlink packet access (HSDPA) feature within the Universal Mobile Telecommunications System (UMTS) standard [1], they have been specifically tailored to an OFDMA air interface. Additional subchannelization options have been added in IEEE 802.16e to improve resource management flexibility and achieve better system performance under a wide range of operating conditions. IEEE 802.16e also adds new medium access control (MAC) procedures related to handover support. Multiple carrier bandwidths and associated fast

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