| Limited frequency resource becomes the leading factor to the improvement of system performance along with the development of mobile telecommunication, and how to improve the frequency efficiency is one of the pop topic in researching area. Especially with the developments of wideband wireless access technology like WiMAX, HSDPA technology could not satisfy the requirements of more broadband bandwidth and high video streaming service in the future. It is coming for 2008 Olympic Games, how to mend their pace to research new technology for 3GPP to get more competitive advantages for futural 10 years?LTE system is the wireless access technology forwarded by 3GPP, which can realize more bandwidth and high bit rate and the key technology for physical downlink is OFDM. So, the inter cell interference is the top problem to solve.Effective frequency planning technology is one of the methods for improving the frequency efficiency. And every kind of inter cell interference management scheme has been proposed by many companies such as Huawei, Siemens, Ericsson, LG electronic etc. and among which the soft frequency reuse scheme proposed by Huawei is the presentation, which is very popular in current researching area.The soft frequency reuse technology(SFR) was thoroughly studied in this paper, and a theoretical analysis model was proposed for SFR, which can also be used for analyzing other inter cell interference management scheme, and then validated this analysis model by link simulation. Secondly, I analyze the influence from the three resource parameters to system performance in two ways, fixed resource allocation and dynamic resource allocation, and their advantages and disadvantages separately, giving the resource scheduling criterion and arithmetic. Lastly, an optimal idea was proposed according to the deficiency of SFR, which could satisfy the performance target better forwarded by 3GPP LTE, realizing more balanced bit rate, and then validated by link simulation, which also prove that the optimal scheme could improve the system throughput and the transmission rate of cell edge user, improving the frequency efficiency. |
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