Abstract
In this paper, we propose a Cross-Layer Stream Control Transmission Protocol (CL-SCTP), which supports multi-streaming and partial reliability for real-time transmissions in IEEE 802.11 wireless networks. In the application layer, we design a Screening Overdue MEssages (SOME) algorithm to leave out transmissions of probable overdue messages. An overdue message refers to a message exceeding its delay budget before the message can be transmitted in the transport layer. Then in the MAC layer, we propose the MOnitoring REdundant frames (MORE) algorithm to detect and remove probable redundant frames. A retransmitted frame from the upper layer makes the same frame entering the MAC layer earlier a redundant frame. We discuss our scheme in detail and perform simulations for both random losses and burst losses. Simulation results show our scheme performs better than Cross-Layer Forwarding Prediction Scheduling (CL-FPS), partially reliable SCTP (PR-SCTP), and SCTP in terms of efficient delivery ratio, average goodput, average end-to-end delay, and representative video metrics including Peak Signal to Noise Ratio (PSNR), Structural Similarity (SSIM), and Video Quality Metric (VQM).
Highlights
People aspire to connect to networks anytime and anywhere with the popularity of mobile devices
We choose SCTP because partially reliable transmissions, which is very suitable for delivering real-time video, are only supported by SCTP or Concurrent Multipath Transfer (CMT), and CMT is not chosen because CMT requires multiple networks interfaces to be active at the same time, which is not available for all wireless devices
It consists of three main components, Low Signalto-Noise Ratio (SNR) Probability (LSP), Screening Overdue MEssages (SOME), and MOnitoring REdundant frames (MORE)
Summary
People aspire to connect to networks anytime and anywhere with the popularity of mobile devices. We choose SCTP because partially reliable transmissions, which is very suitable for delivering real-time video, are only supported by SCTP or CMT, and CMT is not chosen because CMT requires multiple networks interfaces to be active at the same time, which is not available for all wireless devices. To be effective for real-time transmissions, we design the CL-SCTP scheme to include the following functions:. Lai et al.: CL-SCTP Scheme With Redundant Detection for Real-Time Transmissions in IEEE 802.11 Wireless Networks. We propose a CL-SCTP scheme to both problems, employing a cross-layer approach for annulling overdue messages in the application layer and redundant frames in the link layer. We will show that dropping redundant frames in the MAC layer is more applicable to real-time transmissions than dropping redundant segments in the transport layer.
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