一種新型的移動(dòng)AD HOC網(wǎng)絡(luò)跨層服務(wù)質(zhì)量模型[外文翻譯]

A Novel Cross-layer Quality-of-service Model


Abstract
The divided-layer protocol architecture for Mobile ad hoc Networks(simply MANETs)can only provide partial stack. This leads to treat difficulties in QoS guarantee of multimedia information transmission in MANETs, this paper proposes Across-layers QoS Model for MANETs, CQMM. In CQMM ,a core component was added network status repository(NSR), which was the center of information exchange and share among different protocol layers in the stack. At the same time,CQMM carried out all kinds of unified QoS controls. It is advantageous that CQMM avoids redundancy functions among the different protocol layers in the stack and performs effective QoS controls and overall improvements on the network performances.
Keyword Cross-layers QoS Model, Mobile Ad hoc Networks(MANETs);Network Status Repository(NSR) QoS Controls.
1 introduction
With the rapid development of multimedia technologies and the great increase of he bandwidth for personal communication,video and Video services begin to be deployed in MANETs. Different from static networks and Internet,multimedia communications in MANETs such as Voice and Video services require strict QoS guarantee, especially the delay guarantee. In addition, communication among different users can be integrated services with different QoS requirements. These lead to great challenges in QoS guarantee of multimedia communication in MANETs. There are two main reasons in these: 1)MANETs runs in atypical wireless environment with time-varying and unreliable physical link, broadcast channel, and dynamic and limited bandwidth and so forth. Therefore, it can only provide limited capability for differentiated services with strict QoS requirements [1].2) It is difficult that traditional flow project and access control mechanism are implemented because of mobility, multiple hops and self-organization of MANETs.

一種新型的移動(dòng)AD HOC網(wǎng)絡(luò)跨層服務(wù)質(zhì)量模型
摘要:分層協(xié)議的體系結(jié)構(gòu)只能為移動(dòng)Ad Hoc網(wǎng)絡(luò)（簡稱MANETs ）提供部分堆棧。這給移動(dòng)Ad Hoc網(wǎng)絡(luò)中的多媒體通信的質(zhì)量保證帶來了很大的困難。為了改進(jìn)移動(dòng)Ad Hoc網(wǎng)絡(luò)中的多媒體信息傳輸?shù)姆?wù)質(zhì)量，本文將介紹一種針對(duì)移動(dòng)Ad Hoc網(wǎng)絡(luò)的跨層服務(wù)質(zhì)量模型—-CQMM。CQMM的一個(gè)核心組件是網(wǎng)絡(luò)狀態(tài)儲(chǔ)存庫(NSR)，它是信息交換的中心，而且能在堆棧中的不同協(xié)議層之間共享。同時(shí)，CQMM能夠?qū)崿F(xiàn)所有標(biāo)準(zhǔn)的QoS 控制。另外，CQMM還能消除堆棧中不同協(xié)議層之間的冗余功能，并有效的執(zhí)行QoS控制和網(wǎng)絡(luò)性能的全面改善。

關(guān)鍵字: 跨層QoS模型，移動(dòng)Ad Hoc網(wǎng)絡(luò)（MANETs） ，網(wǎng)絡(luò)狀態(tài)儲(chǔ)存庫（NSR），QoS控制。

1、 引言隨著多媒體技術(shù)的快速發(fā)展，和個(gè)人通信帶寬的增加，音頻和視頻服務(wù)已開始在MANETs中出現(xiàn)。與靜態(tài)網(wǎng)絡(luò)和因特網(wǎng)不同的是，MANETs中的多媒體通信，如音頻和視頻服務(wù)，它們對(duì)QoS的保證有非常嚴(yán)的要求，特別是延遲的保證。此外，具有不同QoS要求用戶之間的通信可以集成服務(wù)。這給MANETs.多媒體通信的QoS保證提出了很大的挑戰(zhàn)。主要有兩個(gè)原因：1 ）MANETs是在一種傳統(tǒng)的無線環(huán)境下運(yùn)行的，即，該環(huán)境隨時(shí)間而變化，具有不可靠的物理鏈接、廣播頻道和動(dòng)態(tài)的有限的帶寬，等等。因此，它只能為有嚴(yán)格QoS要求的被區(qū)分的服務(wù)提供有限的能力 [ 1 ]. 2 ）由于MANETs的靈活性，多級(jí)跳以及自組性，因而，傳 統(tǒng) 的流動(dòng)項(xiàng)目和訪問控制機(jī)制就非常難以實(shí)現(xiàn)。