As video streaming services become more popular, users desire high perceived video quality, which has placed more stringent requirements on the quality of connection. Existing issues of cellular networks encourage users to seek alternative connections such as public Wi-Fi networks; however, expectations of both users and owners of Wi-Fi networks are not sufficiently satisfied and various concerns are yet to be addressed by a better Wi-Fi access system. Based on a go-as-you-pay scheme, we design and implement DiFi, a per-user-based system with dynamic resource allocation and pricing. DiFi offers data burst that accommodates user requirements on the burstiness of traffic, in addition to bandwidth. It better caters to the various individual requirements of users, and better utilizes the limited network resources for the owners. We leverage the blockchain-based smart contract to address realistic concerns on decentralized control, privacy and trustiness and our implementation is compatible with existing Wi-Fi infrastructures.

Increasing popularity of delay-sensitive and data-intensive online services such as video streaming has placed stronger requirements on the quality of content delivery. By negotiating premium peering agreement with an Internet service provider (ISP), a content provider (CP) is able to improve its service quality, which is beneficial for attracting end-users and increasing profits. Meanwhile, by deploying cache on its content delivery route with a proper caching mechanism, transit traffic is effectively reduced and bandwidth is saved, hence the CP can also achieve better service quality. In this paper, we study how a CP determines an optimal strategy that maximizes its utility, if both premium peering and caching are available from an ISP. We present the conditions that the CP's optimal strategy should comply with, and observe that the optimal quantity of purchasing one capacity is positively correlated to that of the other. We also find that the CP's optimal strategy indicates that the CP would purchase a moderate amount of capacity, or the maximum amount available in some case, to maximize its utility.