<p class="MsoNormal" style="text-align: left; margin: 0cm 0cm 0pt; layout-grid-mode: char;" align="left"><span class="text"><span style="font-family: ";Verdana";,";sans-serif";; font-size: 9pt; mso-bidi-font-family: Arial;">Intercell interference coordination (ICIC) in orthogonal frequency division multiple access (OFDMA) networks in general and in the 3GPP Long Term Evolution system in particular has received much attention both from the academia and the standardization communities. Understanding the trade-offs associated with ICIC mechanisms is important, because it helps identify the architecture and protocol support that allows practical systems to realize potential performance gains. In this paper we review some of the recent advances in ICIC research and discuss the assumptions, advantages and limitations of some of the proposed mechanisms. We then proceed to describe the architecture and protocol support for ICIC in the 3GPP LTE system. We make the point that the 3GPP standard is formed in a flexible way such that network operators can employ the most suitable ICIC mechanism tailored to their actual deployment scenario, traffic situation and preferred performance target.</span></span></p>

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Intercell interference co-ordination is considered within 3GPP for Evolved UTRA (E-UTRA). The objective is to improve coverage and increase cell-edge bitrate. A number of static and dynamic schemes have been suggested. In this study some basic schemes have been evaluated by means of simulations. Also, the impact of link performance and carried services has been investigated. Of the static schemes the simple 1-reuse performs best for wideband services. The bandwidth reduction (in Hz) with other schemes cannot be regained by the link improvement (in bps/Hz) achieved by the interference reduction. The link performance has a significant impact on the coordination gain. Static schemes improve the cell-edge bitrate with a single receiver antenna but not with the two receiving antennas expected in E-UTRA. Interference co-ordination will be more efficient for narrowband services since the frequency bandwidth allocated to each cell is then better utilized. For wideband packet data services a dynamic scheme is required to improve compared to a simple 1-reuse.