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首頁> 外文期刊>Wireless Communications, IEEE Transactions on >J-CAR: An efficient joint channel assignment and routing protocol for IEEE 802.11-based multi-channel multi-interface mobile Ad Hoc networks
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J-CAR: An efficient joint channel assignment and routing protocol for IEEE 802.11-based multi-channel multi-interface mobile Ad Hoc networks

機(jī)譯：J-CAR：一種有效的聯(lián)合信道分配和路由協(xié)議，用于基于IEEE 802.11的多信道多接口移動(dòng)Ad Hoc網(wǎng)絡(luò)

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摘要

The capacity of an IEEE 802.11-based multi-hop wireless network is limited. By effectively utilizing multiple non-overlapping channels and multiple interfaces, collision and co-channel interference can be reduced. This allows more concurrent transmissions and thus enhances the network capacity. In this paper, we introduce an efficient distributed joint channel assignment and routing protocol, called J-CAR. Unlike existing schemes, J-CAR allows a data interface to dynamically change its routing protocol working mode between send and receive on a call-by-call basis, which distributed joint channel assignment enhances the utilization of both interface and channel. In J-CAR, channels are negotiated and assigned to active links in conjunction with the on-demand routing process. At each hop, J-CAR conducts a local optimization by selecting the least interfered channel according to the channel interference index. The channel interference index is designed by taking both the protocol and physical interference models into consideration. To find the least interfered path for network load balancing on a global scale, J-CAR employs a length-constrained widest-path routing. The ldquowidthrdquo of a path is determined by the interference level of its bottleneck link. With an adjustable threshold on the path length (with respect to the shortest-path), the excessively long path can also be avoided. We show that with a comparable complexity as the existing schemes, J-CAR provides much higher system good puts and shorter end-to-end packet delays.
機(jī)譯：基于IEEE 802.11的多跳無線網(wǎng)絡(luò)的容量受到限制。通過有效地利用多個(gè)非重疊信道和多個(gè)接口，可以減少?zèng)_突和同信道干擾。這允許更多的并發(fā)傳輸，從而增強(qiáng)了網(wǎng)絡(luò)容量。在本文中，我們介紹了一種有效的分布式聯(lián)合通道分配和路由協(xié)議，稱為J-CAR。與現(xiàn)有方案不同，J-CAR允許數(shù)據(jù)接口在逐個(gè)呼叫的基礎(chǔ)上在發(fā)送和接收之間動(dòng)態(tài)更改其路由協(xié)議的工作模式，而分布式聯(lián)合通道分配可提高接口和通道的利用率。在J-CAR中，通過按需路由過程來協(xié)商通道并將其分配給活動(dòng)鏈路。在每一跳處，J-CAR通過根據(jù)信道干擾指數(shù)選擇受干擾最小的信道來進(jìn)行局部優(yōu)化。通過同時(shí)考慮協(xié)議和物理干擾模型來設(shè)計(jì)信道干擾指數(shù)。為了在全球范圍內(nèi)找到用于網(wǎng)絡(luò)負(fù)載平衡的受干擾最少的路徑，J-CAR采用了長度受約束的最寬路徑路由。路徑的“寬度”由其瓶頸鏈路的干擾級別決定。通過對路徑長度（相對于最短路徑）的可調(diào)閾值，也可以避免路徑過長。我們顯示，J-CAR具有與現(xiàn)有方案相當(dāng)?shù)膹?fù)雜性，可提供更高的系統(tǒng)性能，并具有更短的端到端數(shù)據(jù)包延遲。

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