CAJ | 학술논문

在用户对系统带宽以及传输速率要求越来越严格的当下，小蜂窝技术成为解决室内和热点场景覆盖和容量问题的有效途径。为了缓解小蜂窝中切换失败率和乒乓切换率之间的矛盾，首先建立了小蜂窝网络场景下的切换模型，通过采用参考信号接收功率方案对用户终端( UE )的移动轨迹进行跟踪而达到速度估计的目的；之后，推导分析了该模型中切换失败概率、乒乓切换概率与切换触发时间、UE速度的关系；最后，采用遍历算法对切换触发时间进行优化选择。仿真结果表明，所提方案能够将切换失败概率降低到接近于零，同时将乒乓切换率降低了10%，很好地缓解了两者之间的矛盾，更适合于对乒乓切换敏感的高速移动UE。
재용호대계통대관이급전수속솔요구월래월엄격적당하，소봉와기술성위해결실내화열점장경복개화용량문제적유효도경。위료완해소봉와중절환실패솔화핑퐁절환솔지간적모순，수선건립료소봉와망락장경하적절환모형，통과채용삼고신호접수공솔방안대용호종단( UE )적이동궤적진행근종이체도속도고계적목적；지후，추도분석료해모형중절환실패개솔、핑퐁절환개솔여절환촉발시간、UE속도적관계；최후，채용편력산법대절환촉발시간진행우화선택。방진결과표명，소제방안능구장절환실패개솔강저도접근우령，동시장핑퐁절환솔강저료10%，흔호지완해료량자지간적모순，경괄합우대핑퐁절환민감적고속이동UE。
With the more and more strict requirements for system bandwidth and transmission rate, small cell technology is an effective way to solve indoor and hot scenes coverage and capacity issues. In order to alleviate the contradiction between handover failure probability and ping-pang handover probability well, the handover model in heterogeneous networks is established and UE speed is estimated through using the reference signal received power( RSRP) scheme to track UE moving locus. And then the relationship be-tween handover failure probability ( HOF) and ping-pang handover probability ( PP) with respect to time to trigger( TTT) and UE speed is derivated and analyzed. Finally,TTT is optimized and selected by using traversal algorithm. Simulation results show that the proposed scheme can reduce handover failure probabil-ity close to zero while decreasing the ping-pong handover rate by 10 percent. Therefore, it can alleviate a-bove contradiction well and is more suitable for high-speed UE which is sensitive to ping-pong handover.