1、 XXXX 学院 毕业设计（论文）外文参考文献译文本 2012 届 原文出处 A Novel Cross-layer Quality-of-service Model For Mobile AD hoc Network 毕业设计 (论文 )题目 基于 COMNETIII 的局域网的规划与设计 院（系） 电气与电子信息学院 专业名称 电子信息工程 学生姓名 学生学号 指导教师 A Novel Cross-layer Quality-of-service Model For Mobile AD hoc Network Leichun Wang, Shihong Chen, Kun Xiao, Ru
2、imin Hu National Engineering Research Center of Multimedia Software, Wuhan University Wuhan 430072, Hubei, china Email: 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 mu
3、ltimedia 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
4、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 (
5、MANETs), Network Status Repository (NSR), QoS Controls. 1 introduction With the rapid development of multimedia technologies and the great increase of his bandwidth for personal communication, video and video services begin to be deployed in MANETs. Different from static networks and Internet, multi
6、media 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 com
7、munication 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
8、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. At present, most researches on QoS based on traditional divided-layer protocol architecture for MANETs focu
9、s on MAC protocol supporting QoS 2, QoS routing protocol 3 and adaptive application layer protocol with QoS support 4, and so on. It is avoid less that there will be some redundancies on functions among the different protocol layers in the stack. This will increase the complexity of QoS implementati
10、on and cause some difficulties in overall improvement on the network performances. Therefore, it is not suitable for MANETs with low processing ability In recent years, the cross-layers design based on the partial protocol layers in MANETs was put forward.1 proposed the mechanism with QoS guarantee
11、for heterogeneous flow MAC layer.5,6,7,8 did some researches on implementing video communication with QoS guarantee by exchange and cooperation of information among a few layers in MANETs. These can improve QoS in MANETs communication to some extent. However, MANETs is much more complex than wired s
12、ystem and static network, and improvements on QoS guarantee depend on full cooperation among all layers in the protocol stack. Therefore, it is difficult for the design to provide efficient QoS guarantee for communication and overall improvements on the network performances in MANETs. To make good u
13、se of limited resources and optimize overall performances in MANETs, this paper proposes a novel cross-layer QoS model, CQMM, where different layers can exchange information fully and unified QoS managements and controls can be performed. The rest of the paper is organized as follows. CQMM is descri
14、bed in section 2 in detail. In section 3, we analyze CQMM by the comparison with DQMM.The section 4 concludes the paper. 2. A CROSS-LAYER QOS MODEL FOR MANETS-CQMM 2.1 Architecture of CQMM In MANETs, present researches on QoS are mostly based on traditional divided-layer protocol architecture, where
15、 signals and algorithms supporting QoS are designed and implemented in different layers respectively, such as MAC protocol supporting QoS in data link layer 9, routing protocol with QoS support in network layer10.11,and so forth. It can be summarized as A Divided-layer QoS Model for MANETs, DQMM (se
16、e fig.1). In DQMM, different layers in the protocol stack are designed and work independently； there are only static interfaces between different layers that are neighboring in logic； and each protocol layer has some QoS controls such as error control in logic link layer, congestion control in netwo
17、rk, etc. On the one hand, DQMM can simplify the design of MANETs greatly and gain the protocols with high reliability and extensibility. On the other one, DQMM also has some shortcomings: 1) due to the independent design among he different protocol layers, there are some redundancy functions among the different protocol
