| With the quickly development of the3G communication system and the wide application of3G high speed data service, data service has oc-cupied great proportion of the communication service. This situation has put forwards higher request for the signal quality, coverage and the sys-tem capacity of the current mobile communication system. According to the ITU statistics, about70%of the current mobile service occurs in in-door environment but indoor signal reception is poor caused by severe penetration losses through walls. So we need to put forward a kind of ef-fective solutions to enhance the indoor signal coverage of effect.Femtocell can effectively improve the effect of indoor coverage,now it gets a wide range of research. But because the deployment of femtocell has no unified mechanism for the planning and optimization, it will cause certain interference to the current macro cellular network. When we in-troduce the family base station in the traditional macro cellular network, the interference of network become more and more complicated and changeable. Therefore we need to classify and analyze the interference factors of the new environment and according the results of the analysis to give the specific solutions.In this paper, the interference scenarios of femtocell and macrocell network co-existence are researched. We propose two interference control methods about femtocell. In the first method, first of all, we calculate in-terference strength between any two family base station according to the distribution of the femtocell location, channel fading, transmitted power of the communication system, then divide groups, last we assign spectrum resources to the user. In the second method, we check the idle channel in the macro cellular network through the spectrum sensing technology. Then we let the users of the femtocell use these channels by the priority order. Through the simulation we can see that the two meth-ods can effectively improve the system capacity and reduce interference. |
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