[논문]Cross-Layer Analysis of Wireless TCP/ARQ Systems over Correlated Channels

Wu Yi; Niu Zhisheng; Zheng Junli

doi:10.1109/jcn.2005.6387756

Cross-Layer Analysis of Wireless TCP/ARQ Systems over Correlated Channels 원문보기

Journal of communications and networks, v.7 no.1, 2005년, pp.45 - 53

Wu Yi (Department of Electronic Engineering, Tsinghua University) , Niu Zhisheng (Department of Electronic Engineering, Tsinghua University) , Zheng Junli (Department of Electronic Engineering, Tsinghua University)

Abstract ▼ AI-Helper

In this paper, we present a cross-layer analysis of wireless TCP systems over correlated channels. The effects of error correlation on the behavior of link retransmission strategy and the end-to-end throughput of TCP layer are investigated. Based on the cross-layer analysis, an efficient refinement of link layer protocol is proposed by consciously utilizing the information of channel correlations, which leads to the performance improvement of wireless TCP systems.

주제어

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문제 정의

In this paper, we investigate the interactions between TCP and radio link protocols in the presence of correlated channel errors. The contributions of this paper are listed as follows: i) We develop an analytical model for the NAK-based multi-copy SR ARQ schemes over correlated channels and get an insight into the effect of the error correlation on the TCP/RLP performance.
Based on the analysis of link layer behavior and the interactions of the adjacent layers, an improved strategy of link layer is proposed to enhance the TCP/ARQ system performance by better utilization of the burstiness nature of error process. The research shows that an optimization of link layer setting with the advantages of simplicity, practicality and compatibility is significant and necessary, which is highly recommended. Conclusively, improvement of the end-to-end user performance is the final goal of our cross-layer issue, and therefore, we suggest that any evaluation or refinement of the wireless networks should depend on the viewpoint of all the network protocol stacks.
In [12], the interactions between ARQ mechanisms and TCP over wireless links are investigated in a wired-cum-wireless network scenario. This work focuses on the investigation of TCP/RLP performance with different ARQ persistence policies and RLP configurations. However, the TCP and RLP behaviors with varyiii흥 channel correlation degrees are not considered and therefore, it does not reveal the correlation effect of the channel errors on the TCP/RLP performance.

가설 설정

1) The failure probability of the original data frame is still deP(F0\H) = PE.
H: The transmitter begins to supply the particular data frame; So: The data frame is received successfully by the receiver; Fq: The data frame is detected missing at the receiving side; Sk- The recovery is successfully accomplished in the fc-th NAK round, for k = 1, 2, ..
The contributions of this paper are listed as follows: i) We develop an analytical model for the NAK-based multi-copy SR ARQ schemes over correlated channels and get an insight into the effect of the error correlation on the TCP/RLP performance. ii) Based on the proposed analytical model, we propose an intuitive and efficient solution to improve the TCP/RLP performance in the highly correlated channels.

제안 방법

In this paper, we focus on the cross-layer analysis of all the three layers: The physical layer with correlated errors, the radio link layer with NAK-based multi-copy selective repeat (SR) ARQ scheme, and the transport layer with TCP NewReno. The effects of error correlation on the behavior of link layer strategy and the interactions between end-to-end TCP and local link layer protocols are investigated analytically.
This is due to the different triggering mechanism of the first NAK round which unconsciously utilizes the correlated information of the underlying physical channels. The advantage of the first NAK round over correlated channels gives us a heuristic suggestion: It would efficiently enhance the system performance to make all the NAK rounds “learn” from the first NAK round in order to consciously utilize the correlated information of wireless channels.
To study the interactions among wireless fading channels, link layer protocols and TCP at transport layer, we examine numerical examples based on both analysis and simulation. In the simulation, we employ ns-2 [19].
In this paper, we investigate the interactions between TCP and radio link protocols in the presence of correlated channel errors. The contributions of this paper are listed as follows: i) We develop an analytical model for the NAK-based multi-copy SR ARQ schemes over correlated channels and get an insight into the effect of the error correlation on the TCP/RLP performance. ii) Based on the proposed analytical model, we propose an intuitive and efficient solution to improve the TCP/RLP performance in the highly correlated channels.

성능/효과

13 and 14 show the enhancement of end-to-end TCP throughput caused by the link layer optimization over correlated channels. As the performance improvement results from the channel correlation in the channel condition with fdT = 1 where it is very close to the random loss situation, the TCP throughput comes back to be almost the same with that of the TCP/ARQ system with standard radio link protocols. The analysis and results lead us to conclude that an optimized design of link layer could efficiently enhance the end- to-end performance of user level without interference with the higher layer.
As the performance improvement results from the channel correlation in the channel condition with fdT = 1 where it is very close to the random loss situation, the TCP throughput comes back to be almost the same with that of the TCP/ARQ system with standard radio link protocols. The analysis and results lead us to conclude that an optimized design of link layer could efficiently enhance the end- to-end performance of user level without interference with the higher layer.
Reference [9] studies the throughput performance of transport control protocol/radio link protocol (TCP/RLP) stack on correlated fading wireless channels. The results show that because of significant burstiness in RLP frame errors of the highly correlated Rayleigh fading, longer persistence at the RLP layer to recover lost RLP frames is beneficial at low-link fading margins. However, since the TCP and RLP throughput performance are both obtained through simulations, the analysis of the link behavior over correlated channels needs to be improved.

참고문헌 (23)

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상세보기
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상세보기
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DOI : 10.1109/JCN.2005.6387756 [무료]
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