Multimedia cooperative sharing method based on P2P-BT in VANET

Abstract

The invention belongs to the technical field of mobile communication and discloses a multimedia cooperative sharing method based on a P2P-BT in a VANET. Firstly, to implement a PB-MCSM well in the VANET, a VANET hierarchical structure is established according to characteristics of a general P2P-BT in combination with the characteristics and motion trail of different vehicles in the VANET; then a multimedia query algorithm based on distributed Tracker servers is proposed for a problem that the multimedia resource query rate is low in the VANET; and then a tree-shaped returning algorithm based on indirect reciprocity game is proposed so that it is ensured that a vehicle also uploads while downloading and thus transmission delay caused by selfishness and chain scission is solved. The beneficial effects and advantages of the multimedia cooperative sharing method based on the P2P-BT in the VANET are that the method is capable of simulating the multimedia transmission state of nodes under a practical environment and applicable to a selfish VANET environment. Experiments show that the method improves successful query rate and returning rate of multimedia resources in the VANET and reduces returning delay in a returning process and improves the satisfaction degree of a vehicle user.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and relates to the use of the file distribution protocol Bit Torrent in the peer-to-peer network, referred to as P2P-BT technology, to solve the problem of multimedia cooperation and sharing in the VANET of the Internet of Vehicles; the VANET hierarchical structure is established, and a multimedia file query algorithm is proposed And the game-based return algorithm can improve the successful query rate and return rate of multimedia resources in VANET, reduce the return delay in the return process, and improve the satisfaction of vehicle users; Background technique [0002] Vehicles in VANET can obtain shared multimedia files through vehicle-to-vehicle V2V and vehicle-to-roadside unit V2R communication; however, due to the limited resources in VANET, high mobility of vehicles, intermittent connections, and the existence of selfish behavior, the successful query of resources is reduced....

AI Technical Summary

Problems solved by technology

[0002] Vehicles in VANET can obtain shared multimedia files through vehicle-to-vehicle V2V and vehicle-to-roadside unit V2R communication; however, due to the limited resources in VANET, high mobility of vehicles, intermittent connections, and the existence of selfish behavior, the successful query of resources is reduced. Rate and return rate increase the delay of multimedia transmission in VAENT, which seriously affects the experience of vehicle users; therefore, according to the actual situation of VANET, it is very important to design a multimedia cooperation and sharing method that is in line with the actual environment;

[0003] At this stage, the research on multimedia sharing in VANET mainly has the following two problems: 1) Most of the literature uses the Hongfan method for resource query; this method will not only cause broadcast storm problems, but also often cause data packet collisions when the number of nodes increases , the forwarding failure increases the propagation delay; such as the hybrid retrieval method based on Hongfan and DHT-based methods (round retrieval method in VANET-based P2P network, Quanqing Xu, Heng Tao Shen, ZaibenChen, BinCui, Xiaofang Zhou, and Yafei Dai; “Hybrid Retrieval Mechanisms in Vehicle-Based P2P Networks”; In Allen G., Nabrzyski J., Seidel E.eds. Proc. of Computational Science–ICCS2009Lecture Notes in Computer Science. Heidelberg: Springer-Verlag, 2009.303- 314.); a source-sharing protocol derived from Typhoon, spatial location-based aware vehicles share / request resources from neighbors (Typhoon: A Resource Sharing Protocol in Urban Vehicle Mobility Networks, Guey Yun Cahng, Jang-Ping Sheu, and Jyun-Hua Wu; "Typhoon: Resource Sharing Protocol for Metropolitan Vehicular Ad hoc Networks". Proc.Of Wireless Communications and Networking Conference (WCNC), Sydney, Australia, 2010.1-5); the RoadcastP2P content sharing method relaxes the requirement to get the requested service quickly ( Roadcast: A Popularity-Aware Content Sharing Scheme in VANETs, ​​Yang Zhang, Jing Zhao, Guohong Cao. “Roadcast: A Popularity Aware Content Sharing Scheme in VANETs”. Proc.Of ACM SIGMOBILE Mobile Computing and Communications Review, New York, NY , USA, 2010.1-14.); use the cluster-based P2P framework to estimate the link state, and query it through the broadcast method (in the integrated network of VANETs and the Internet A Novel Social Cluster-based P2P Framework, Sung-Han Lin, Junn-Yen Hu, Cheng-Fu Chou, Ing-Chau Chang, Chien-Chun." A Novel Social Cluster-based P2P Framework for Integrating VANETs with the Internet ".Proc.of IEEE Wireless Communications and Networking Conference, Budapest, 2009.1-6.); establish a two-layer P2P framework in VANETs, ​​select the cluster head through the connection time of the nodes in the cluster to avoid query delay caused by link disconnection, and Message delivery using broadcast method (Information Sharing Service in VANETs with Enhanced Two-Tier P2P2 Communications, Jinjie Guo, Chang Hu, Yiding Huo, Yu Liu, and Lin Zhang. "Information Sharing Service in VANETs with Enhanced Two-Tier P2P Communications" .Proc.of15th International Symposium on Wireless Personal Multimedia Communications (WPMC), Taipei, 2012.65-69); 2) These documents mainly study the problem of resource query and retrieval, and do not consider the transmission delay caused by the selfish non-forwarding behavior of the vehicle during the resource transmission process; however , in VANET, nodes tend to maximize the benefits they get from the network, try to avoid the responsibilities they should assume in the network, and reduce energy consumption and performance reduction caused by contributing to the network; this selfish behavior frustrates In addition to the enthusiasm of nodes actively contributing resources, the collaborative interaction between nodes is less and less (T. Chen, L. Zhu, F. Wu, S. Zhong. Stimulating Cooperation in Vehicular Ad Hoc Networks: A Coalitional Game Theoretic Approach.IEEE Transactions on Vehicular Technology (ITVT), 2011, 60 (2): 566-579); the advent of the big data era has made peer-to-peer network P2P resources more and more abundant and diversified; but the disadvantage is that the value density is low, and only nodes Collaboration among them can obtain high-value resources; and the P2P-BT system depends on throttling Cooperation between peers and contribution of their own resources, so selfish behavior limits the application of mobile P2P-BT advantages in VANET;

Images