Content-centric networking(CCN) is rising to solve the problems suffered by traditional networks,especially in terms of content delivery.One of the critical issues for basic CCN is supporting mobility.Handoff of Mobil...Content-centric networking(CCN) is rising to solve the problems suffered by traditional networks,especially in terms of content delivery.One of the critical issues for basic CCN is supporting mobility.Handoff of Mobile Content Source(MCS) will result in a large scale routing update,which generates huge amount of routing overhead and leads to service interruption.Most of the existing CCN mobility mechanisms are transplanted from the IP mobility solutions,which are unnaturally integrated with CCN.Different from previous works,a mobility strategy from the perspective of CCN architecture is proposed to support the handoff of MCS in this paper.Especially,we define the critical network routers that can limit the routing update scale effectively when MCS handoff is conducted.Based on the defined critical network routers,the proposed scheme can provide lower routing update overhead,faster routing convergence and shorter service interruption time.Finally,series of simulations are conducted to validate the effectiveness of our proposed scheme.展开更多
In this study, we propose new dynamic spectrum allocations in multi-cells and intra-cell of cognitive network to enhance system performance in terms of decreasing probability of interruption and spectrum handoff of co...In this study, we propose new dynamic spectrum allocations in multi-cells and intra-cell of cognitive network to enhance system performance in terms of decreasing probability of interruption and spectrum handoff of communication services in a cognitive system. The inter-cells of the spectrum allocation mechanism is designed to share the risk of vacating spectrum caused by licensed incumbents re-occupying the spectrum and minimize probability of service interruption in the cognitive network. This mechanism also can guarantee fairness among multi-cells. The intra-cell of the proposed spectrum allocation is based on a service data hierarchical model and establishes a mapping mechanism between layered data and the spectrum. It can reduce probability of spectrum handoff. Finally, simulation results are given and show that the new mechanism can reduce service interruption ratio and the probability of spectrum handoff caused by licensed incumbents with re-occupying the spectrum.展开更多
基金supported by the National Basic Research Program(973) of China(No.2012CB315801)the National Natural Science Fund(No.61302089,61300184)
文摘Content-centric networking(CCN) is rising to solve the problems suffered by traditional networks,especially in terms of content delivery.One of the critical issues for basic CCN is supporting mobility.Handoff of Mobile Content Source(MCS) will result in a large scale routing update,which generates huge amount of routing overhead and leads to service interruption.Most of the existing CCN mobility mechanisms are transplanted from the IP mobility solutions,which are unnaturally integrated with CCN.Different from previous works,a mobility strategy from the perspective of CCN architecture is proposed to support the handoff of MCS in this paper.Especially,we define the critical network routers that can limit the routing update scale effectively when MCS handoff is conducted.Based on the defined critical network routers,the proposed scheme can provide lower routing update overhead,faster routing convergence and shorter service interruption time.Finally,series of simulations are conducted to validate the effectiveness of our proposed scheme.
文摘In this study, we propose new dynamic spectrum allocations in multi-cells and intra-cell of cognitive network to enhance system performance in terms of decreasing probability of interruption and spectrum handoff of communication services in a cognitive system. The inter-cells of the spectrum allocation mechanism is designed to share the risk of vacating spectrum caused by licensed incumbents re-occupying the spectrum and minimize probability of service interruption in the cognitive network. This mechanism also can guarantee fairness among multi-cells. The intra-cell of the proposed spectrum allocation is based on a service data hierarchical model and establishes a mapping mechanism between layered data and the spectrum. It can reduce probability of spectrum handoff. Finally, simulation results are given and show that the new mechanism can reduce service interruption ratio and the probability of spectrum handoff caused by licensed incumbents with re-occupying the spectrum.
