Research On Several Key Technologies Under Spectrum Aggregation Scenarios

The contradiction on wideband requirement of next generation mobile communication network and conditions of discontinuous spectrum assignment has to be solved. Mobile communication network evolution seeks for effective usage of non-continuous spectrum resource. Spectrum aggregation is a novel solution to aggregate the dispersed and narrow-band spectrum fragments into wideband spectrum. Furthermore, the spectrum aggregation of large-range spectrum fragments has a feature named frequency selective diversity, which can utilize the diverse spectrum heterogeneity, to realize the optimization of resource allocation and usage.This paper focus on several technologies under spectrum aggregation scenarios, which included:active interference cancellation algorithm for multiple spectrum fragments and fast cell search scheme under spectrum aggregation scenarios. The researches are supported by Huawei Technology Foundation "Research on Key Technologies on Carrier Aggregation".This paper describes firstly the key problems under spectrum aggregation scenarios, such as RF hardware constrained problem, spectrum heterogeneity problem, physical layer transmission problem of dispersed spectrum, and backward compatibility problem in LTE-A. The research progress and solutions are concluded in the second chapter.The third chapter proposes the active interference cancellation algorithm for multiple spectrum fragments, in order to solve the NC-OFDM out-of-band leakage interference problem. The optimal solution of algorithm is given by matrix simplification. Furthermore, we propose a low-complexity algorithm. Performance analysis shows the algorithm is able to meet the demand of practical application.The fourth chapter proposes a fast cell search scheme to balance the SCH detection performance and spectrum utilization. The main idea of our scheme is to apply the same carrier priority principles on both sides of UEs and eNBs. The scheme also takes spectrum heterogeneity into account to make sure SCHs are always on the low-frequency carriers. The number of SCHs can be selected flexibly. Performance analysis shows that our scheme is robust to low SNR scenarios.