Inter-cell interference coordination (ICIC) is one of the key technologies in the multi-cell radio resource management of mobile systems. It plays a vital role in mitigating strong inter cell interference and guaranteeing proper quality of services for in-progress sessions. Because heterogeneous deployment is adopted in LTE-Advanced, and interference problem becomes serious. In this paper, we propose an ICIC method based on region in OFDM downlink cellular systems. Through dividing the border of cells into several segments, and marking by identities, when serious inter-cell interference occurs, the serving cell transfer the region information with the coordination information. The neighbor cell can judge whether it has exerted interference on the serving cell and perform ICIC action if it is yes. It can drastically improve the adjustment accuracy of ICIC. By simulating our method in the system simulation platform of LTE-Advanced, we can see the new method has better performance than original one in improving users' throughput.
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