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Call Admission Control Schemes for QOS provisioning in Mobile IPv6 Networks
Shun-Fang Yang,Jung-Shyr Wu 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
Mobility management is a key issue for deployment of wireless broadband mobile networks. A good network management policy requires an efficient call admission control scheme to allocate network resources to handover and new users. Call Admission Control (CAC) plays a significant role in providing Quality of Service (QOS) in wireless broadband mobile networks. Although much research focus on modified Mobile IP to get better efficient performance, there are few papers to discuss admission control when considering handover and mobility management. CAC should be introduced to Mobile IPbased network to guarantee the QOS for users. In this paper, we extend Hierarchical Mobile IPv6 (HMIPv6) Binding Update message to support CAC schemes. These CAC schemes can reduce the probability of the handoff dropping and cell overload, and limit the new call blocking probability.
Modified EDCF to Improve the Performance of IEEE 802.11 e Contention-based Channel Access
Wen-Yen Lin,Jung-Shyr Wu 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper we propose a modified EDCF scheme, M-EDCF, to improve the Quality of Service (QoS) of the IEEE 802.11e wireless network. The IEEE 802.11e standard is presented to support QoS at medium access control level using a priority scheme by differentiating the inter-frame space and the initial window size. In addition to providing relative priorities by adjusting the size of the Contention Window (CW) of each traffic class, our proposed scheme, M-EDCF, also consider the effect of a back_off_timer to avoid unnecessary collisions. Our study shows that in either in heavy or light traffic load our proposed scheme can provide better quality for both high priority and low priority packets than either the AEDCF [1][14].
QOS GUARANTEE FOR WIRELESS LAN WITH FAIRNESS TRANSMISSION
Bor-Jiunn Hwang,Wen-Yen Lin,Jung-Shyr Wu 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
Recently, there has been considerable research interest in providing services related to multimedia over IP (MoIP) in wireless networks. For example, IEEE 802.11e develops Enhanced Distributed Coordination Access (EDCA) and Hybrid Coordination Function (HCF) controlled channel access (HCCA), to enhance the Quality of Service (QoS) of the original MAC mechanism. However, the priority-based access mechanism can not guarantee QoS requirements in terms of delay and throughput since it is contention-based. In this paper, we propose several schemes that regulate backoff contention window adaptively to achieve more fairness between ACs. The simulation results present the constraint due to agreement level. Moreover, it is demonstrated that the proposed schemes can assign transmission opportunity more fairly than EDCA. Also the proposed schemes really have a performance improvement.
A King Stifling Voices of Dissent? Popular Protests and State Responses in Xi's China
Wang Hsin‐Hsien,Tzeng Wei‐Feng,Wang Shinn‐Shyr,Chiu Wei‐Chih 인하대학교 국제관계연구소 2021 Pacific Focus Vol.36 No.1
To deal with the increases in the frequency of popular protests, China's leader, Xi Jinping, has called for “innovative social governance” as a new concept to resolve social conflicts. In this study, we collect and analyze a unique dataset to compare state responses to popular protests during Xi's term and Hu's term. We find that, under Xi's rule, state repression is more frequently employed to handle social disturbances. Violent protests are significantly more likely to be repressed than nonviolent protests during both the rule of Hu and Xi, while protests that involved a population of the middle and upper classes experienced more state crackdown under Xi's rule rather than under Hu's governance. Our empirical analysis suggests that the approaches by which the Chinese government deals with social unrest have not yet been “innovative.” Instead, China still relies heavily on despotic power in the Xi era.