一种基于改进Hash函数的LTE ePDCCH搜索空间的设计

The Design of Search Space in LTE ePDCCH Based on Improved Hash Function

对于LTE的ePDCCH来说,从eCCE到PRB的映射没有交织器,如果沿用PDCCH的Hash函数进行搜索空间的随机化处理,会造成搜索空间在频域资源上过分集中,对集中式ePDCCH的性能产生负面影响。为使ePDCCH的搜索空间尽量遍布在所有可能的ePDCCH资源上,对PDCCH的Hash函数进行改进,以对集中式ePDCCH的搜索空间进行随机化处理。仿真结果表明,该方法可有效提高ePDCCH频选调度的效率,降低ePDCCH连续调度阻塞的概率。

Due to no interleaver in the eCCE to PRB mapping in LTE ePDCCH,if the Hash function was used in search space randomization,the search space would be too concentrated in frequency domain resource.In order to make the ePDCCH search space across all ePDCCH resources,the improved Hash function was used in the randomization of centralized ePDCCH search space.The simulation results show that the method can improved the efficiency of ePDCCH frequency selective scheduling effectively,and reduce the probability of continuous scheduling blocking.