CAJ | 학술논문

异构网络中的小区选择是影响系统性能的关键因素，其与资源分配的相互耦合又极大地增加了复杂度。针对采用正交频分多址（orthogonal frequency-division multiple access，OFDMA）技术的宏蜂窝—微蜂窝（mac-ro-pico）异构网场景，提出了一种基于博弈的下行链路小区选择算法。首先建立了资源分配与小区选择联合优化模型，进而将其转换为用户预接入与小区重选两个子问题；基于网络层级和用户服务质量需求（quality of serv-ice，QoS）设计了效用函数和罚函数，能有效折中用户 QoS 和网络负载均衡性能。理论分析和仿真结果表明，当网络负载较重时，基于博弈的小区选择算法能有效提高系统吞吐量，改善用户公平性并使负载在不同层网络间分布得更加均匀。
이구망락중적소구선택시영향계통성능적관건인소，기여자원분배적상호우합우겁대지증가료복잡도。침대채용정교빈분다지（orthogonal frequency-division multiple access，OFDMA）기술적굉봉와—미봉와（mac-ro-pico）이구망장경，제출료일충기우박혁적하행련로소구선택산법。수선건립료자원분배여소구선택연합우화모형，진이장기전환위용호예접입여소구중선량개자문제；기우망락층급화용호복무질량수구（quality of serv-ice，QoS）설계료효용함수화벌함수，능유효절중용호 QoS 화망락부재균형성능。이론분석화방진결과표명，당망락부재교중시，기우박혁적소구선택산법능유효제고계통탄토량，개선용호공평성병사부재재불동층망락간분포득경가균균。
The scheme of cell selection in heterogeneous networks is one of the key factors that affected the system capacity. This paper proposed a game theoretic based downlink cell selection scheme,for OFDMA(orthogonal frequency-division multiple access)based Macro-Pico heterogeneous networks.It constructed the joint optimization model of resource allocation and cell se-lection,and transformed to two sub-optimization problems of user pre-access and cell selection.The scheme could make a tradeoff between the QoS(quality of service)of users and load balancing,based on the utility and penalty function.Both theo-retical and simulation results demonstrate that,when the network load is heavy,the proposed game theoretic based cell selection algorithm can increase the system throughput and the user fairness.Also,it can make the load distribution between the two tiers of network more evenly.