綜合業(yè)務(wù)城域網(wǎng)IEEE802.5預(yù)約級(jí)協(xié)議改進(jìn)策略
The strategy of using IEEE802.5 reserving protocol the metropolitan area net of integrated service
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摘要: 預(yù)約是局域網(wǎng)(LAN)中常見的存取方式,尤其以環(huán)形LAN的IEEE802.5預(yù)約級(jí)協(xié)議著稱。為了在綜合業(yè)務(wù)的環(huán)形城域網(wǎng)(MAN)中利用預(yù)約級(jí)協(xié)議,必須考慮綜合業(yè)務(wù)的特點(diǎn),對(duì)IEEE802.5預(yù)約級(jí)協(xié)議進(jìn)行改進(jìn)。其出發(fā)點(diǎn)是既要盡可能保證高優(yōu)先級(jí)信息能提前預(yù)約,又要防止出現(xiàn)低優(yōu)先級(jí)信息(特別是最低優(yōu)先級(jí)信息)長(zhǎng)時(shí)間得不到發(fā)送的局面。該文提出的高預(yù)約級(jí)中斷策略,比較合理地解決了這一問(wèn)題。其實(shí)質(zhì)是在合理范圍內(nèi)犧牲高優(yōu)先級(jí)業(yè)務(wù)的服務(wù)質(zhì)量,換來(lái)部分提高低優(yōu)先級(jí)業(yè)務(wù)的服務(wù)質(zhì)量。模擬實(shí)驗(yàn)表明,改進(jìn)后的IEEE802.5預(yù)約級(jí)策略適合于綜合業(yè)務(wù)MAN的利用。
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關(guān)鍵詞:
- 城域網(wǎng); 預(yù)約級(jí)協(xié)議; 中斷策略
Abstract: Reservation is frequently used in the local area network (LAN). One of the most famous application is IEEE802.5 reservation protocol. In order to make use of the reservation protocol in the annular MAN, it is necessary to pay more attention to the characteristics of the integrated services. Their purpose is not only assuring the high rank information can reserve token in ahead but also preventing the low rank information (especially the lowest rank information) waiting for a long time. This paper proposes high protocol which can solve the problem rationally. The motif is properly enhancing QoS (Quality of Service) for the low rank information at the cost of the decrease of QoS for the high one. Simulation results show that the improved IEEE802.5 reservation protocol is adapt to MAN which has integrated service. -
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