Hybrid multimedia-on-demand systems

Abstract

Abstract-As broadband networks keep increasing in transmission speed, multimedia-on-demand (MOD) is expected to be one of the most popular broadband services in the near future. MOD systems can provide two types of services: interactive service and batch service. The interactive service provides each user with one dedicated stream. With it, the user can use the VCR function controls such as pause, forward and rewind. However, the service is expensive and not scalable to system size. With batch service, the users who request the same multimedia content within a batch period will be grouped together and served by one dedicated stream. Hence, the system can either use fewer resources or serve more customers. However, batch users must wait for programs to begin and are unable to perform VCR function control. In this paper, we take advantage of both services by considering an MOD system that provides both services. Also, we propose two methods to optimize their coexistence. In addition, an analytical model is derived for performance evaluation. Numerical results show that the proposed hybrid system really outperforms both individual systems. The hybrid system provides a superior solution to both the service providers and the users. Specifically, given a limited storage resource, the service provider receives more revenue by serving more users concurrently, while the users have a satisfactory viewing experience due to higher availability of programs and the low average waiting time.

Dynamic Spectrum Management for WCDMA/DVB Heterogeneous Systems

“…In dynamic spectrum management, since the major goal is the optimum allocation of spectrum resources, we assume that the value of has been assigned. Algorithms to determine appropriate values for can be found, for example, in [13].…”

“…The service request rate of content also has a Poisson distribution, and its average arrival service rate is [13]. The ratio of the service requests for content to the total number of service requests is defined as , with…”

Dynamic Spectrum Management for WCDMA and DVB Heterogeneous Systems

“…The ratio of the number of service requests for I q to the total number of service requests is ξ q , 0≤ξ q ≤1. The service request rate for I q also has a Poisson distribution, with average service arrival rate λ i ξ q [5]. For the DVB system, there will be a wait time W after a request for service is accepted for other user requests before the content is sent.…”