A Cross-layer Approach for Throughput Enhancement of Unsteady Satellite Networks
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As a feasible mechanism against link-layer errors, Forward Error Correction (FEC) scheme has been suggested for satellite channel. However, the existing FEC scheme cannot lead to the optimal throughput gain of TCP when a satellite link is in an unsteady state. In particular, if FEC applies a larger amount of redundancy to recover the most corrupted packets, too much bandwidth has to be consumed to send the overlarge redundant information. On the contrary, if FEC uses a lower amount of redundancy in order to fully utilize the available bandwidth to send the more user data, a higher residual packet loss rate will be incurred. This paper introduces an effective cross-layer approach to overcome the drawbacks of the existing scheme. In the scheme, a maximum header scope is defined to cover all protocols’ headers of every MAC frame, and the FEC decoder only identifies the integrity of the header scope and leaves the validation of frame payload to TCP. Thus a lower amount of redundancy can be used to significantly reduce the residual packet loss rate as well as the unnecessary consumption of the available bandwidth. Simulation result shows that the proposed scheme can significantly reduce the throughput jitter of TCP while the satellite link is in an unsteady state or when a non-optimal amount of redundancy is applied by FEC, compared to the existing approaches.
Abstract
As a feasible mechanism against link-layer errors, Forward Error Correction (FEC) scheme has been suggested for satellite channel. However, the existing FEC scheme cannot lead to the optimal throughput gain of TCP when a satellite link is in an unsteady state. In particular, if FEC applies a larger amount of redundancy to recover the most corrupted packets, too much bandwidth has to be consumed to send the overlarge redundant information. On the contrary, if FEC uses a lower amount of redundancy in order to fully utilize the available bandwidth to send the more user data, a higher residual packet loss rate will be incurred. This paper introduces an effective cross-layer approach to overcome the drawbacks of the existing scheme. In the scheme, a maximum header scope is defined to cover all protocols’ headers of every MAC frame, and the FEC decoder only identifies the integrity of the header scope and leaves the validation of frame payload to TCP. Thus a lower amount of redundancy can be used to significantly reduce the residual packet loss rate as well as the unnecessary consumption of the available bandwidth. Simulation result shows that the proposed scheme can significantly reduce the throughput jitter of TCP while the satellite link is in an unsteady state or when a non-optimal amount of redundancy is applied by FEC, compared to the existing approaches.
참고문헌 (16)
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