A multi‐level satellite channel allocation algorithm for real‐time VBR data

Abstract

SUMMARYIntegrated services over a shared satellite channel need a MAC protocol that is able to deal with real-time tra$c without substantially a!ecting the e$ciency of the shared medium. Due to its bursty nature, MPEG coded VBR video transmission is one of the most challenging real-time applications. In this paper, we analyse the statistical performance of a simple allocation method for VBR tra$c by using an accurate statistical model of an MPEG-2 VBR coded movie, whose tra$c exhibits a peak to mean ratio of about 4. The results were obtained both analytically and by simulation, and show that our method is suitable for transmitting non-interactive video and best-e!ort tra$c on the same satellite link. The e$ciency of the proposed method shows no dependency on the statistical properties of the input tra$c.

A Cross-Layer Approach to Enhance QoS for Multimedia Applications Over Satellite

“…This case might happen as well with the MAC protocols proposed in [13,19,20]. Other algorithms based on the QoS information provided by the xQoS-Interpreter, could be implemented within the MAC protocols proposed in these papers, taking then advantage of the real time vision of flow and ADUs requirements.…”

“…2. Connors et al [13], Celandroni et al [19] and Koutsakis et al [20] propose new access schemes for return link satellite system well adapted to video transmission with less signaling overhead.…”

Satellite bandwidth allocation based on MPEG-4 videoconference traffic prediction

“…[9], the authors propose a scheme which uses n levels of allocation to MPEG-2 video users. Each of the levels represents a threshold for the user's throughput; if the data currently transmitted by the user is below a threshold, the user gives up a portion of its allocated bandwidth in favor of other users which are currently in need of more bandwidth resources; if the user's throughput exceeds a threshold, the user regains the bandwidth which was initially allocated to it.…”

Using traffic prediction and estimation of provider revenue for a joint GEO satellite MAC/CAC scheme

“…b. Demand Assignment Protocols [3,23]. Channel capacity is dynamically allocated, in response to the requests made by the stations depending on their queue occupancies.…”

“…The reason is that a bursty user's profile will probably have changed significantly by the time the bandwidth allocation is made by the Network Control Center (NCC). The two main types of satellite systems are the bent-pipe [1][2][3] and on-board processing (OBP) ones [4][5][6][7][8][9]. For advanced satellites with OBP capability, the NCC is almost always located onboard the satellite so that it takes the requesting earth station only one round-trip time (RTT) plus the processor/queuing processing time to receive the reply for its reservation request.…”