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A cross-tier cooperative transmission strategy with cooperative precoding is used to reduce the intercell inter-ference in heterogeneous network, especially the interference in cell range expansion areas. The proposed cooperative strategy supports the cooperative transmission of Macro BS and low power BS at resource block level based on LTE-Advanced downlink transmission system. Simulation results indicate that the cooperative strategy based on hierar-chical cooperative framework provides more satisfactory system throughput gains compared with non-cooperative scheme and the existing eICIC technology under cell range expansion.

To address the problem of enforcing access control for library digital resources,federated authentication technologies were analyze which are widely used in the world,and CALIS unified authentication technologies that are widely deployed in China’s libraries were also analyzed.A solution integrating federated authentication and CALIS unified authentication technologies was proposed,which was developed,deployed and tested on the test-bed of CARSI federation.Test results show the proposed solution enforces effective and flexible access control for library resources.