CAJ | 학술논문

在3GPP LTE自组织网络（SON ）中，面向整体切换性能的自优化算法明显优于面向个别性能的算法。本文针对EWPHPO算法无法对小区负载进行动态调整，也无法对单个过载小区的切换参数进行及时调整，从而导致掉话率等指标不能得到有效控制的问题，提出了兼顾整体切换性能和负载均衡的WPLBHO算法。通过仿真并与EWPHPO算法在相同环境下的仿真结果进行比较，我们的算法在保持切换失败率基本不变的情况下，使掉话率降低约20％、乒乓效应降低约5％，从而使系统整体切换性能（HP ）提升约25％；同时，使系统平均过载时间下降近50％。因此我们的算法使系统整体性能得到了明显改善。
재3GPP LTE자조직망락（SON ）중，면향정체절환성능적자우화산법명현우우면향개별성능적산법。본문침대EWPHPO산법무법대소구부재진행동태조정，야무법대단개과재소구적절환삼수진행급시조정，종이도치도화솔등지표불능득도유효공제적문제，제출료겸고정체절환성능화부재균형적WPLBHO산법。통과방진병여EWPHPO산법재상동배경하적방진결과진행비교，아문적산법재보지절환실패솔기본불변적정황하，사도화솔강저약20％、핑퐁효응강저약5％，종이사계통정체절환성능（HP ）제승약25％；동시，사계통평균과재시간하강근50％。인차아문적산법사계통정체성능득도료명현개선。
In the self-organizing network (SON) of 3GPP LTE ,the algorithms dynamically adjusting many parameters to-gether are better than those adjusting only one parameter .EWPHPO algorithm can not dynamically adjust the handover parameters and the load of the individual cell timely ,which causes the dropping probability not to be controlled effectively .In this paper ,the WPLBHO algorithm was suggested to improve the EWPHPO algorithm in order to solve these problems .The numerical results were given and compared with those from the EWPHPO algorithm under the same simulation conditions .It is shown that the dropping probability and the ping-pang ratio decrease about 20% and 5% ,respectively ,but the handoff failure rate hardly vary .Then the total performance of the system increases about 25% .On the other hand ,the average load time decreases about 50% .These show that the total performance of the system is evidently improved through our algorithm .