Abstract
In this paper, a mechanism of Peer-to-Peer (P2P) data dissemination for distributing deadline-sensitive streaming files in Vehicular Ad-Hoc Networks (VANETs) is proposed. In a multi-media application sensitive to deadline, the data requested by the peer needs to be received before its playback deadline. For the purpose, we adopt different strategies from the previous works, as follows. First, a distinct lookup function is designed by just collecting the part information of data distribution to reduce the network overhead. It is executed simultaneously with the task of requesting data to take advantage of the timeliness of collected information. Second, in order to utilize the limited bandwidth of VANETs efficiently, the function in requesting data schedules only data sufficient to meet the playback rate requirement of the service. Third, a method is designed to provide deadline-sensitive segment dissemination and alleviate the problem of the highly mobile hosts in VANETs. It interactively uses the estimated and actual historical values of the transmission time between two neighboring hosts and the period of two neighboring hosts remaining connected. Fourth, to further alleviate the mobility problem, a route recovery function is designed to recover a disconnected route timely, and a system parameter can be set according to host speed. Fifth, the setting of the system parameter can be a trade-off between the playing quality of the service and the capacity of the network. Compared with a very recently related work, the effectiveness of this mechanism has been verified by a lot of simulations. When the hosts in the network are static, the admission peers of the mechanism increases by 18% compared with the recent work. On the other hand, when the hosts are dynamic, the mechanism improves 10-25% and 0-14% in admission peers and timely received data over the recent work, respectively.
Highlights
Motivated by the widespread deployment of inexpensive broadband wireless connections for users, many deadline-sensitive multimedia applications, such as Videoon-Demand (VoD) system, have become practical
In Vehicular Ad-Hoc Networks (VANETs), every vehicle is equipped with a Global Positioning System (GPS) receiver, and its location information can be obtained by the GPS
PROPOSED ALGORITHM Let vc be a new coming peer intending to request a P2P deadline-sensitive streaming service in VANETs, vp s be the peers keeping some segments of the service, and vf s be the forwarders
Summary
Motivated by the widespread deployment of inexpensive broadband wireless connections for users, many deadline-sensitive multimedia applications, such as Videoon-Demand (VoD) system, have become practical. Several works [5]–[31] have been proposed for P2P applications in MANETs/VANETs. Since the problem of estimating the values is not properly solved, they cannot provide deadline-sensitive data dissemination for deadlinesensitive streaming applications. In [18], the authors study the multi hop data dissemination from one data source to multiple nodes in wireless networks to minimize network power consumption and social cost Most of these works [5]–[18] aim to utilize the limited bandwidth more efficiently for the files shared among MANET peers. In [19], a delay-sensitive segment scheduling algorithm is proposed for P2P real-time streaming services in MANETs. Since link disconnected duration and route disconnected time are not considered, it is not applicable to VANETs. B. The numbers of busy and idle time slots are denoted as b_slot and i_slot, respectively
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