內(nèi)容中心車聯(lián)網(wǎng)中基于優(yōu)先級的內(nèi)容分發(fā)和緩存策略研究
發(fā)布時間:2021-04-17 02:18
內(nèi)容為中心網(wǎng)絡(Content centric networks,CCN)為車載Ad Hoc網(wǎng)絡鋪平了道路,并可以利用任意媒介進行信息傳輸以提高網(wǎng)絡的可靠性。它使得網(wǎng)絡能夠更方便地支持從多個位置、移動設備和各種網(wǎng)絡發(fā)送和接收內(nèi)容。由于基于內(nèi)容命名并借助緩存進行內(nèi)容分發(fā),CCN受到研究者的關注并成為一個研究熱點。目前,在內(nèi)容中心車聯(lián)網(wǎng)(Content centric vehicular networks,CCVN)中進行內(nèi)容分發(fā)取得了很好的性能,CCVN已經(jīng)提出了多種用于內(nèi)容獲取和分發(fā)的模型,然而其中大多數(shù)都沒有考慮基于優(yōu)先級的內(nèi)容傳播。通常,車輛在CCN中采用相同的轉(zhuǎn)發(fā)策略。然而,CCVN中關鍵與非關鍵的數(shù)據(jù)傳輸?shù)哪康氖遣煌。與人身安全相關的安全信息優(yōu)先級高于非安全信息,應該被首先傳播。而非安全信息則按照用戶需求數(shù)量的多少被先后轉(zhuǎn)發(fā)。因此,CCVN中內(nèi)容轉(zhuǎn)發(fā)時十分有必要考慮優(yōu)先次序。此外,CCVN具有網(wǎng)內(nèi)緩存功能,可以在內(nèi)容傳輸?shù)接脩舻倪^程中對內(nèi)容進行緩存。然而,網(wǎng)內(nèi)緩存也存在著存儲空間有限、緩存管理效率低下、內(nèi)容冗余等問題。因此,協(xié)作緩存對于向盡可能多的內(nèi)容提供緩存機會至關重要。本...
【文章來源】:北京郵電大學北京市 211工程院校 教育部直屬院校
【文章頁數(shù)】:56 頁
【學位級別】:碩士
【文章目錄】:
ABSTRACT
摘要
Chapter1: Introduction
1.1 Background
1.2 Research Status
1.3 Our Contribution
1.4 Report Layout
Chapter2: Survey of CCN and VANET
2.1 CCN Overview
2.1.1 Naming in CCN
2.1.2 Forwarding and Routing in CCN
2.1.3 Datagram State
2.1.4 Caching and Security in CCN
2.2 Vehicular Ad-hoc Networks (VANET)
2.3 CCN Collaboration with VANET
2.4 Related Works
2.5 Drawbacks of the Existing System
Chapter3: Priority-based Content Dissemination in CCVN
3.1 System Model
3.2 Proposed Scheme
3.2.1 Safety Content Scheduling
3.2.2 Non-safety Content Scheduling
3.3 Workflow Diagram
3.4 Performance Evaluation
Chapter4: Cluster-based Cooperative Caching in CCVN
4.1 System Design
4.2 Communication Model
4.3 Cluster Formation
4.3.1 Cluster Master (CM) Election
4.3.2 Cluster Management
4.4 Content Index Table (CIT)
4.5 Slave Information Table (SIT)
4.6 Content Caching
4.7 Performance Evaluation
4.7.1 ndnSIM
4.7.2 Simulation Analysis
Chapter5: Conclusion and Future Works
5.1 Conclusion
5.2 Future Works
REFERENCES
ACKNOWLEDGEMENT
本文編號:3142620
【文章來源】:北京郵電大學北京市 211工程院校 教育部直屬院校
【文章頁數(shù)】:56 頁
【學位級別】:碩士
【文章目錄】:
ABSTRACT
摘要
Chapter1: Introduction
1.1 Background
1.2 Research Status
1.3 Our Contribution
1.4 Report Layout
Chapter2: Survey of CCN and VANET
2.1 CCN Overview
2.1.1 Naming in CCN
2.1.2 Forwarding and Routing in CCN
2.1.3 Datagram State
2.1.4 Caching and Security in CCN
2.2 Vehicular Ad-hoc Networks (VANET)
2.3 CCN Collaboration with VANET
2.4 Related Works
2.5 Drawbacks of the Existing System
Chapter3: Priority-based Content Dissemination in CCVN
3.1 System Model
3.2 Proposed Scheme
3.2.1 Safety Content Scheduling
3.2.2 Non-safety Content Scheduling
3.3 Workflow Diagram
3.4 Performance Evaluation
Chapter4: Cluster-based Cooperative Caching in CCVN
4.1 System Design
4.2 Communication Model
4.3 Cluster Formation
4.3.1 Cluster Master (CM) Election
4.3.2 Cluster Management
4.4 Content Index Table (CIT)
4.5 Slave Information Table (SIT)
4.6 Content Caching
4.7 Performance Evaluation
4.7.1 ndnSIM
4.7.2 Simulation Analysis
Chapter5: Conclusion and Future Works
5.1 Conclusion
5.2 Future Works
REFERENCES
ACKNOWLEDGEMENT
本文編號:3142620
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