According to the " minimum performance requirement " , a singlepoll scheme and a multipoll scheme are put forward for the realization of controlled access part of hcf ( named as polled txop ) . the polling efficiencies of the two schemes are calculated 基于802 . 11e给出的最低服务性能要求,提出一种singlepoll和一种multipoll调度算法实现hcf受控接入部分polledtxop ,推导、分析两者的调度效率。