Research On OFDMA System Resource Scheduling Algorithm

In wireless communication, through resource scheduling, the problem thatmultiple users compete for resource–sharing can be solved effectively, which canimprove the spectrum effectiveness and throughput of telecommunication systemremarkably. The traditional scheduling algorithms, such as round-robin scheduling,Max C/I scheduling, the former achieves the best fairness, which at the expenses oflarger system throughput. and the latter achieves maximum of throughput. However,its fairness show not good enough. Base the relative merits of the two algorithms,proportional fair scheduling can meet both the user’s fairness and system throughput,it gets a certain user fairness by sacrificing a portion throughput of the system, whichgets an excellent compromise between fairness and throughput to a certain extent,thereby, make the system overall perfermance achive optimal.For multi-carrier OFDMA system, its flexibility of resource scheduling is fargreater than that of single carrier system.OFDMA can not only achieve much higherspectrum efficiency, but also be widely considered as the most potential down-link airinterface technology in the next generation of wireless communication. during theresearch on the traditional scheduling algorithms, it mainly considerate the single cellscene without thinking the inter-cell interference effects in multi-cell, however, inmulti-cell real scene, inter-cell interference can make a great defference to resourcescheduling. OFDMA can replace CDMA in that it can overcome the CDMA selfinterference. All the sub-carriers are orthogonal to each other in OFDMA system,which can solve the intra-cell interference easily. However, the interference ininter-cell is difficult to coordinate. Because of the adjacent channel interferenceexistence，making a balance between fairness and throughput,which in order to reacha optimal system overall perfermance becomes more complex when researchinginter-cell resource scheduling.In order to solve the above problems, base on OFDMA system, the paper makesa research on single cell multi-user packet resource scheduling algorithm. The thesiscarries out a deep comparative study on the system perfermance of conventionalscheduling algorithms: round-robin scheduling, Max C/I scheduling and proportionalfair scheduling, conclusion of simulation analysis as following, proportional fairness scheduling algorithm can obtain a higher throughput and a better fairness. In the laterpart of the paper, the idea of proportional fair is introduced to multi-cell resourcescheduling. Through the study on Inter-cell Interference Coordination techniques ofmulti-cell resource scheduling based on OFDMA system and combined proportionalfair scheduling algorithm, it can be seen that this scheme reduces the inter-cellinterference in the meantime, it also enhances the opportunity that the edge users arescheduled in the cell, and thus achieves the goal that the overall system capacity isimproved.