Inter Cell Interference Co-ordination In TD-LTE

Multi-cell wireless systems are inherently exposed to inter-cell interference, originating fromthe spatial reuse of the same radio resources in neighboring cells. Accordingly, many of thesesystems, including the Global System for Mobile Communication (GSM), Enhanced GeneralPacket Radio Service (EGPRS) and the Universal Terrestrial Radio Access (UTRA) have employedsome, typically static, quasi static interference randomization. One of the static coordinationsolutions is frequency reuse-n, where each cell is assigned one out of the available n number offrequency bands (e.g., n=3) such that no two directly neighboring cells get the same frequency. Anobvious drawback of reuse-n solutions is that only a fraction of the bandwidth is available in onecell and that may become the bottleneck in achieving high data rates.Mainly because of the bandwidth waste and the planning effort associated with reuse-nsolutions, the3GPP Long Term Evolution (LTE) system has been designed with the assumption ofreuse-1as the primary deployment case. The resources in LTE are assigned by the scheduler in unitsof time-frequency resource blocks, where a certain number of OFDM symbols on a given numberof subcarriers constitute one Resource Block (RB). So that it will interfere with each other in twocells edge unavoidably.3GPP had submitted some solutions, such as interference randomization, interference cancel,and interference co-ordination. ICIC is the simple ones.The paper will introduce three typically solutions and effect, setup test environment fordownlink SFR and investigate, give suggestion.