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Semi-TCP與ARQ聯(lián)合的端到端可靠傳輸方法*
電子技術(shù)應(yīng)用
易昌華1,,周亮2,,張紹鳳3
(1.上海海洋大學(xué) 現(xiàn)代信息與教育技術(shù)中心,,上海201306,;2.上海交通大學(xué)附屬第六人民醫(yī)院,,上海 201306,; 3.上海海事大學(xué) 信息工程學(xué)院,,上海 201306)
摘要: 在無線自組織網(wǎng)絡(luò)中,,數(shù)據(jù)傳輸受干擾較多,,信道不穩(wěn)定,,因此傳統(tǒng)的TCP協(xié)議并不能滿足在這種復(fù)雜環(huán)境下的通信要求,節(jié)點(diǎn)間的自動重傳請求協(xié)議(ARQ)重傳增加,,會導(dǎo)致節(jié)點(diǎn)的緩存占用率很大,,整體傳輸性能降低。為了解決該問題,,采用Semi-TCP協(xié)議與ARQ協(xié)議相結(jié)合,,在不改變原有TCP架構(gòu)的基礎(chǔ)上將擁塞控制下放到鏈路層,改變鏈路層ARQ的糾錯能力,,提高信道的利用率,。在Exata平臺上進(jìn)行了仿真,實(shí)驗(yàn)證明在無線多跳網(wǎng)絡(luò)中,,該方法能有效提高網(wǎng)絡(luò)傳輸性能,。
中圖分類號:TN915.03;TP393 文獻(xiàn)標(biāo)志碼:A DOI: 10.16157/j.issn.0258-7998.233940
中文引用格式: 易昌華,,周亮,,張紹鳳. Semi-TCP與ARQ聯(lián)合的端到端可靠傳輸方法[J]. 電子技術(shù)應(yīng)用,2023,,49(9):86-89.
英文引用格式: Yi Changhua,,Zhou Liang,Zhang Shaofeng. Semi-TCP and ARQ combined end-to-end reliable transmission method[J]. Application of Electronic Technique,,2023,,49(9):86-89.
Semi-TCP and ARQ combined end-to-end reliable transmission method
Yi Changhua1,Zhou Liang2,,Zhang Shaofeng3
(1.Modern Information and Educational Technology Center,, Shanghai Ocean University, Shanghai 201306,, China,; 2.Shanghai Jiaotong University Affiliated Sixth People's Hospital, Shanghai 201306, China,; 3.College of Information Engineering,, Shanghai Maritime University, Shanghai 201306,, China)
Abstract: In the wireless multi hop network environment, the data transmission is subject to more interference and the channel is unstable. Therefore, the traditional TCP protocol can not meet the communication requirements in this complex environment. The increase of ARQ retransmission between nodes will lead to a large cache occupancy rate and a low overall transmission performance. In order to solve this problem, Semi-TCP protocol and ARQ protocol are combined to lower congestion control to the link layer without changing the original TCP architecture, change the error correction capability of ARQ in the link layer, and improve the channel utilization. The simulation on Exata platform shows that this method can effectively improve the network transmission performance in wireless multi hop networks.
Key words : wireless multi hop network,;transport layer protocol;cache,;node;error correction

0 引言

無線自組織網(wǎng)絡(luò)(Wireless Ad-hoc Network)是一個由幾個到上百個節(jié)點(diǎn)組成的,、采用無線通信方式的,、動態(tài)組網(wǎng)的多跳的移動性對等網(wǎng)絡(luò)。在無線自組織網(wǎng)絡(luò)中,,數(shù)據(jù)傳輸所受干擾較多,,信道不穩(wěn)定,傳統(tǒng)的傳輸控制協(xié)議(Transmission Control Protocol, TCP)在無線自組網(wǎng)中性能較差,。TCP擁塞控制主要作用在傳輸層,,而自動重傳請求(Automatic Repeat-reQuest,ARQ)協(xié)議的可靠性控制作用在鏈路層,,因此傳統(tǒng)TCP與ARQ結(jié)合的可靠控制方法的缺陷在于鏈路層與傳輸層之間存在著競爭,,ARQ與TCP有可能會同時進(jìn)行重傳,TCP會誤認(rèn)為數(shù)據(jù)包丟失是由于擁塞導(dǎo)致的,,啟動可靠性控制機(jī)制造成大量的TCP重傳,,在信道狀態(tài)很差時,鏈路層在節(jié)點(diǎn)間的ARQ重傳也會急劇增加,,導(dǎo)致節(jié)點(diǎn)的緩存占用率很高,,網(wǎng)絡(luò)性能急劇下降。

為了解決上述問題,,本文采用Semi-TCP協(xié)議[1]與ARQ協(xié)議相結(jié)合,,相比于傳統(tǒng)TCP,Semi-TCP在不改變原有TCP架構(gòu)的基礎(chǔ)上將擁塞控制下放到鏈路層,,與鏈路層ARQ協(xié)議相結(jié)合,,改變鏈路層ARQ的糾錯能力,使部分節(jié)點(diǎn)的數(shù)據(jù)錯誤直接通過傳輸層Semi-TCP進(jìn)行重傳,,這樣就能有效緩解當(dāng)前節(jié)點(diǎn)緩存占用率大的問題,,提高吞吐量。


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作者信息:

易昌華1,,周亮2,,張紹鳳3

(1.上海海洋大學(xué) 現(xiàn)代信息與教育技術(shù)中心,上海201306;2.上海交通大學(xué)附屬第六人民醫(yī)院,,上海 201306,;3.上海海事大學(xué) 信息工程學(xué)院,上海 201306)


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