A method is presented to implement MAC layer downlink carrier aggregation in TD⁃LTE⁃A system based on TMS320 C66x multi⁃core DSP.Based on the LTE⁃Advanced protocols released by 3GPP,the MAC layer entity is divided into several sub⁃entities according to the type of serving cells with each MAC sub⁃entity uses one DSP core.The result of carrier aggregation is achieved finally. One adaptive dynamic feedback algorithm is designed for the above scheme,which can balance the data transmission delay and the size of data buffer between MAC sub⁃entities. Through the simulation and result analysis of the adaptive dynamic feedback algorithm, the parameters of the downlink carrier aggregation in two serving cells are proposed.Finally the method is verified and applied on the termi⁃nal test instruments.%提出了一种基于TMS320C66x多核DSP 的 LTE⁃A 系统 MAC 层下行载波聚合的实现方法，在3GPP 发布的LTE⁃Advanced协议的基础上，将 MAC 层实体按服务小区类型拆分为多个 MAC 子实体，每个 MAC 子实体独自占用一个DSP 核，最终达到载波聚合的效果；针对上述方案提出了一种自适应动态反馈算法，该算法能够均衡 MAC 子实体间的数据传输延时和缓存区大小，通过对自适应动态反馈算法的仿真和结果分析，给出了适合2个服务小区下行载波聚合的参数建议值，并在终端测试仪表中将该方案进行了验证和应用。
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