استراتژی های قیمت گذاری برای تمایز شبکه های انتقال محتوا خدماتی

In order to reduce the user latency, the web sites disseminate some of their information to surrogate caches located closer to the users. We discuss a simple differentiated service type architecture for content delivery networks. A pricing scheme is next proposed to complement this architecture and provide fair service to the subscribed publishers. Then, we show that the suggested pricing scheme is also the optimal (revenue maximizing) pricing scheme for a monopolistic surrogate. We investigate the performance of the pricing scheme in a duopoly and show that under certain conditions the competition results in peering of the surrogates. Finally, we suggest methods to determine the optimal number of service classes offered to the users.

The Internet is becoming more commercially oriented each passing day, and the effects of the user service quality is becoming more prominent. In the new Internet economy, the web sites (origin servers) are the publishers of the Internet content. They appear as businesses generating their revenues from the content that they provide. Usually, the more popular a web site is the more revenue it generates. Meanwhile, the popularity of a web site depends among other things on the high quality (quality can be measured in terms of delay, delay jitter or bit rate, etc.) delivery of its content. In order to prevent deprivation of quality of service due to server and Internet congestion, the origin servers historically used proxy caches located closer to the users for the delivery of their content. However, until recently the caches are used in a best effort fashion with a single quality of service. Several Content Distribution Networks (CDNs) such as Akamai [26], Edgix [27] and DigitalIsland [28] began offering caching services with service level agreements (SLA) to the publishers. CDNs provide the publishers a reliable and robust surrogate caching server infrastructure, which covers most of the globe. The origin servers ‘rent’ portions of the caching capacity from the CDN’s caching servers and receive varying benefits depending on the surrogates’ locations, capacities and the user request arrival rates.