دانلود رایگان مقاله تضمین تاخیر شبکه برای خدمات متمایز در شبکه محتوا محور

abstract

The newly adopted built-in caching mechanism guarantees efficient content delivery for content-centric networking (CCN) as compared to the existing IP-based networks such as the Internet. However, it is a challenge at the same time for CCN to meet QoS requirements due to content caching. In this paper, we investigate the problem of providing network delay guaranteed services in CCN. More specifically, we study the problem of meeting network delay requirements for differentiated services (content providers) in CCN while at the same time optimizing the overall content delivery performance. To support delay guarantee, we first present a simple and holistic network model which characterizes network delays of routing content to clients at different locations. By aligning network locations with content popularity, we ensure that each content provider has an optimized network delay of routing content to clients. We then derive analytical network delays for content providers by incorporating their content distribution models into the proposed holistic network model, and further formulate the delay guarantee task as a nonlinear integer programming (NIP) problem under the given network resources and traffic access patterns. We evaluate our mechanism and investigate the optimized network performance using different real/synthetic network topologies. With numerical studies, we analyze the process of competing for the network resources by different content providers, and investigate how various factors (e.g., content popularity, traffic volume, router storage capacity) affect this competition process. Our models and results presented in this paper provide guidance in designing resource provisioning and QoS mechanisms for CCN.

5. Conclusion and future work

 5.1. Conclusion

QoS guarantee for content-centric networks is a new but challeng- ing research area due to the newly introduced built-in caching mech- anism. Network delay is a key metric of QoS. In this paper, we inves- tigate the problem of guaranteeing network delays for differentiated 681 services (content providers) in CCN while at the same time optimiz- ing the overall content delivery performance. To address the key chal- lenges, in particular, the high computational cost incurred by con- ventional solutions such as Markov models, we propose a simple yet 685 elegant network model for characterizing network delays of routing content to clients with different locations. We then derive analytical formula for network delay for each content provider by incorporat- ing its content distribution pattern into the proposed network model. 689 The network delay guarantee task is further formulated as a nonlin- ear integer programming (NIP) problem under the given network re- sources and traffic patterns of the underlying content providers. Fi- nally, we evaluate our mechanism by numerical studies using differ- ent network topologies and investigate various factors (e.g., content popularity, traffic volume, router storage capacity) affecting the com- petition process. Our models and results in this paper provide guid- ance in designing mechanisms for QoS guarantee as well as other is- sues such as network resource provisioning and allocation in CCN.