本文選題：車用無(wú)線自組織網(wǎng)絡(luò) + IEEE��； 參考：《電子科技大學(xué)》2014年碩士論文

【摘要】：車載無(wú)線自組織網(wǎng)絡(luò)(VANET)能夠?yàn)槿藗兲峁┌踩?舒服,方便的交通服務(wù)。IEEE1609系列協(xié)議和IEEE802.11p協(xié)議共同規(guī)定了車載網(wǎng)絡(luò)的整體協(xié)議架構(gòu)。并且1609.4協(xié)議提出車網(wǎng)絡(luò)采用多信道傳輸,闡述了信道切換方式。IEEE 1609.4標(biāo)準(zhǔn)規(guī)定車載網(wǎng)絡(luò)MAC層采用多信道傳輸機(jī)制,在SCH時(shí)隙具有六個(gè)業(yè)務(wù)信道,1609.4協(xié)議并沒有明確規(guī)定這些信道的具體分配措施。為了提高業(yè)務(wù)信息的傳輸性能,本文研究了MAC層多個(gè)信道和時(shí)間的分配策略,針對(duì)車載網(wǎng)絡(luò)車與路邊設(shè)施通信交互模式,提出了一種基于節(jié)點(diǎn)相對(duì)位置及業(yè)務(wù)類型的資源分配算法。路邊設(shè)施在接收到節(jié)點(diǎn)的業(yè)務(wù)需求時(shí),能夠根據(jù)當(dāng)前節(jié)點(diǎn)的位置信息和業(yè)務(wù)的Qos需要計(jì)算出各個(gè)節(jié)點(diǎn)的優(yōu)先級(jí),然后在處理相應(yīng)的業(yè)務(wù)需求時(shí),需要計(jì)算不同分配方法的評(píng)價(jià)函數(shù)值,從中選出需要slot較少,切換信道次數(shù)較少和能夠保持各個(gè)信道負(fù)載較為均衡的方法。在車輛密度較大的交通環(huán)境中,有限的頻帶資源可能無(wú)法滿足節(jié)點(diǎn)的業(yè)務(wù)需求。本文提出了一種車載網(wǎng)絡(luò)中的接納控制和信道預(yù)留策略,由于車輛在道路上行駛具有一維性,車輛節(jié)點(diǎn)的運(yùn)行狀態(tài)更容易掌握。RSU對(duì)于資源的預(yù)留機(jī)制預(yù)測(cè)結(jié)果更有意義,預(yù)留資源也會(huì)更加準(zhǔn)確。另外,考慮到車輛節(jié)點(diǎn)的運(yùn)行速度要遠(yuǎn)遠(yuǎn)大于移動(dòng)終端的運(yùn)行速度,而且車輛的速度和方向隨時(shí)都會(huì)改變,為了提高信道預(yù)留準(zhǔn)確性,RSU將會(huì)根據(jù)車輛密度的變化,動(dòng)態(tài)的更新獲取到的節(jié)點(diǎn)位置信息。從而在保證原有服務(wù)不掉線的情況下,盡量的接納新用戶的服務(wù)。為了對(duì)資源分配算法對(duì)車載網(wǎng)絡(luò)性能的影響做出驗(yàn)證,本文建立了車載網(wǎng)絡(luò)MAC協(xié)議仿真平臺(tái)。并利用仿真平臺(tái)驗(yàn)證了基于節(jié)點(diǎn)相對(duì)位置及業(yè)務(wù)類型的資源分配算法對(duì)于業(yè)務(wù)信息傳輸?shù)目煽啃?數(shù)據(jù)包的端到端時(shí)延以及系統(tǒng)的吞吐量產(chǎn)生的影響,并與基于空閑信道資源分配算法的仿真結(jié)果做出分析和比較。
[Abstract]:The vehicle wireless self-organizing network (VANET) can provide people with security, comfort, and convenient traffic service.IEEE1609 series protocol and IEEE802.11p protocol, which stipulates the overall protocol architecture of the vehicle network. And the 1609.4 protocol proposes that the vehicle network adopts multi channel transmission, and describes the channel switching mode.IEEE 1609.4 standard for vehicle network M. The multi channel transmission mechanism is adopted in the AC layer, and there are six traffic channels in the SCH slot. The 1609.4 protocol does not specify the specific allocation measures of these channels. In order to improve the transmission performance of the business information, this paper studies the allocation strategy of multiple channels and times in the MAC layer, and proposes the communication mode of the vehicle network vehicle and the roadside facilities. A resource allocation algorithm based on the relative location and service type of the node. The roadside facilities can calculate the priority of each node according to the location information of the current node and the Qos needs of the service when receiving the service requirements of the node. Then, the evaluation function values of the different allocation methods need to be calculated when dealing with the corresponding business requirements. A method of selecting less slot, less switching channel times and maintaining a more balanced load of each channel is selected from it. In a traffic environment with large vehicle density, the limited frequency band resources may not meet the service requirements of the nodes. The road on the road is one dimension, and the running state of the vehicle node is more easy to grasp..RSU is more meaningful to the prediction result of the reservation mechanism of the resource, and the reserved resources will be more accurate. In addition, considering that the running speed of the vehicle node is far greater than the running speed of the mobile terminal, and the speed and direction of the vehicle will be changed at any time. In order to improve the reservation accuracy of the channel, RSU will update the location information of the node dynamically according to the change of vehicle density, so as to accept the service of the new user as much as possible when the original service is not dropped. In order to verify the impact of the resource allocation algorithm on the performance of the vehicle network, the vehicle network MAC is established in this paper. The simulation platform is used to verify the effect of the resource allocation algorithm based on the relative position of the node and the service type on the reliability of the traffic information transmission, the end to end delay of the packet and the throughput of the system, and makes an analysis and comparison with the simulation results based on the allocation algorithm based on the free channel resource allocation.

【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN915.04
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本文編號(hào)：1778265