为了减少5G异构网络中不必要的小区切换次数以及降低无线链路失败率,提出了一种基于熵权优劣解距离法(Technique for Order Preference by Similarity to an Ideal,TOPSIS)的小区预切换方案。熵权TOPSIS法将小区作为预切换对象,将下行...为了减少5G异构网络中不必要的小区切换次数以及降低无线链路失败率,提出了一种基于熵权优劣解距离法(Technique for Order Preference by Similarity to an Ideal,TOPSIS)的小区预切换方案。熵权TOPSIS法将小区作为预切换对象,将下行信干噪比、预测驻留时间和移动角度均作为切换指标,分析并预测目标切换小区从而达到预切换目的。首先,根据邻小区的参考信号接收功率(Reference Signal Receiving Power,RSRP)值得到候选目标小区列表;然后,采用熵权法计算三个切换指标的权重;最后,使用TOPSIS法对候选小区进行排序,排序最高的小区即为目标切换小区。实验和仿真结果表明,与现有的切换方法比较,所提方案在一定程度上减少了小区切换次数和无线链路失败率。展开更多
Zhang et al. proposed a sequential multisignature scheme based on RSA. The scheme has advantages of low computation and communication costs, and so on. However, we find a problem in their scheme that the verifier can ...Zhang et al. proposed a sequential multisignature scheme based on RSA. The scheme has advantages of low computation and communication costs, and so on. However, we find a problem in their scheme that the verifier can not distinguish whether the multisignature is signed by all the signers of the group or only by the last signer. Thus, any single signature created by the last signer can be used as a multisignaturr created by the whole group members. This paper proposes an improved scheme that can overcome the defect. In the new scheme, the identity messages of all the signers are added in the multisignature and used in verification phase, so that the verifier can know the signature is generated by which signers. Performance analysis shows that the proposed scheme costs less computation than the original scheme in both signature and verification phases. Furthermore, each partial signature is based on the signer＇s identity certificate, which makes the scheme more secure.展开更多
文摘为了减少5G异构网络中不必要的小区切换次数以及降低无线链路失败率,提出了一种基于熵权优劣解距离法(Technique for Order Preference by Similarity to an Ideal,TOPSIS)的小区预切换方案。熵权TOPSIS法将小区作为预切换对象,将下行信干噪比、预测驻留时间和移动角度均作为切换指标,分析并预测目标切换小区从而达到预切换目的。首先,根据邻小区的参考信号接收功率(Reference Signal Receiving Power,RSRP)值得到候选目标小区列表;然后,采用熵权法计算三个切换指标的权重;最后,使用TOPSIS法对候选小区进行排序,排序最高的小区即为目标切换小区。实验和仿真结果表明,与现有的切换方法比较,所提方案在一定程度上减少了小区切换次数和无线链路失败率。
基金The National Natural Science Foundation of China (No.60403027)
文摘Zhang et al. proposed a sequential multisignature scheme based on RSA. The scheme has advantages of low computation and communication costs, and so on. However, we find a problem in their scheme that the verifier can not distinguish whether the multisignature is signed by all the signers of the group or only by the last signer. Thus, any single signature created by the last signer can be used as a multisignaturr created by the whole group members. This paper proposes an improved scheme that can overcome the defect. In the new scheme, the identity messages of all the signers are added in the multisignature and used in verification phase, so that the verifier can know the signature is generated by which signers. Performance analysis shows that the proposed scheme costs less computation than the original scheme in both signature and verification phases. Furthermore, each partial signature is based on the signer＇s identity certificate, which makes the scheme more secure.
