中文摘要：

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。

英文摘要：

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 .