电子信息外文文献翻译---一种新型的移动adhoc网络跨层服务质量模型-电子信息(编辑修改稿)

电子信息外文文献翻译---一种新型的移动adhoc网络跨层服务质量模型-电子信息(编辑修改稿)内容摘要：

y taking into consideration the power, the cache, the reliability of each node in a routing. QoS requirements of services from high layer such as the bandwidth and the delay, and implementation strategies of error control in logic link sublayer and the way of the channel management in MAC sublayer. Transport layer: In CQMM, the protocol design of transport layer needs to be aware of both functions and implementation mechanism of lower layers such as the way of error control in data link layer, the means to establish, choose and maintain routing in the work layer, and QoS requirements from the application layer, to determine corresponding transmission strategies. In addition, the transport layer also needs to analyze all kinds of events from low layers such as the interrupt and change of the routing and the work congestion, and then respond properly to avoid useless sending data. Application layer: There are two different strategies in the design of the application layer: 1) differentiated services. According to the functions provided by the low layers applications are classed as the different ones with different priority levels. 2) Applicationaware design. Analyze specific requirements of different applications such as the bandwidth, the delay and the delay twitter and so on, and then assign and implement the functions for each layer in the protocol stack according to the requirements. QoS Cooperation and Management in CQMM In CQM, the core of QoS cooperation and management is that NSR acts as the exchange and share center of status information in protocol stack, and by the full exchange and share of work status among different protocol layers the management and scheduling of the work resources and the overall optimization of the work performances can be implemented effectively. The management and scheduling of the work resources, the crosslayer QoS cooperation and the overall optimization of the work performances. Management and scheduling of work resources: Network resources include all kinds of resources such as the cache, the energy and the queue in each node, and the munication channel among nodes and so froth. In CQMM, the management and scheduling of the work resources are not to the unified management and scheduling of the work resources and full utilization of limited resources in order to increase the QoS of all kinds of munication. QoS cooperation and control: In CQMM, all kinds of QoS controls and cooperation such as the rate adaptation, the delay guarantee and the congestion control and so on, are not implemented by each layer alone, but pleted through the operation of all layers in the protocol stack. For example, the congestion in MANETs can be earlier prevented and controlled by the cooperation among different layers such as ACK from MAC sublayer, the routing information and the loss rate and delay of package from work layer, and the information of rate adaptation in transport layer and so on. Performances Optimization: In CQMM, the optimization of the work performances aims to establish a work optimization model constrained by all layers in the protocol architecture and finds the “best” ways according to the model in order to improve the overall performances in MANETs. 3. ANALYSIS OF CQMM Present QoS models for MANETs can mainly be classed as a QoS model based on traditional dividedlayer architecture DQMM and a crosslayer QoS model proposed by this paper CQMM. QoS model used by [1, 58] is to some extent extended on the basis of DQMM in nature. Here, we only pare CQMM with DQMM Information Exchange Different protocol architecture and principle between CQMM lead to great differences in the means, the frequency, the time and the requirement of the information exchange, (see table 1) From Table 1, it can be seen that pared wit DQMM CQMM has some advantages: 1) more flexible information exchange. Neighboring layers can information by the interfaces between layers or NSR, and crossing layers may exchange information through NSR。 2) simpler transform in information format. Different layers can exchange information by NSR, so these layers only need to deal with the format transform between the layers and NSR。 3)lower requirements. The protocol layers can read them in proper time Information from different protocol layers temporarily stored in NSR, so the layers exchanging information are not required to be synchronous in time。 4) more accurate control. NSR in CQMM can store information of some time from the different layers, which is advantageous to master the work status and manage the work more accurately. However, these require higher information exchange frequencies among the different layers, more processing time of each node, and more munication among them.。 Protocol Design In DQMM, it is inevitable that there are so。