# Context-Aware Data Dissemination for ICN-Based Vehicular Ad Hoc Networks
## 2 Related Work
The responded content will also be cached in the CS (Content Store) at all the nodes it passes by. A vehicular information network based on NDN has been suggested in [19]. The authors proposed a hierarchical content naming scheme by using both devices' names and geographical location. Although location-based routing is discussed in their work, the authors use location as name and then apply the name-based forwarding mechanism suggested by NDN to perform the content forwarding. Compared with this work, we use location information to calculate the distance and perform greedy routing. In addition, the problem of large numbers of Interest and Data packets has also been considered in this work. However, the NDN routers, each with multiple interfaces, in the fixed network area are used to aggregate Data packets and segregate Interest packets. In contrast to this work, we reduce the number of Interest and Data packets by suppressing the forwarding of both Interest and Data packets in certain wireless areas directly, and by reducing the number of hops the packets traversed in VANET. In [20; 21], the authors studied and summarized the advantages of using NDN in vehicular networks. Here, the focus has been on how to realize the basic NDN mechanisms in VANETs, such as where and how to implement NDN concepts like the PIT and CS and how to combine them with flooding mechanisms to spread data packets. We have compared the performance of our method with that of using the basic NDN mechanism (denoted as Basic-NDN in Section 4). The work reported in [22] takes this one step further. A counter-based broadcast scheme and two transmission-defer timers are introduced to counteract the broadcast storm phenomenon, by reducing packet collisions on the wireless medium. However, no advanced mechanism has been presented to suppress the broadcast storm. Work [23; 24] proposed methods for Interest forwarding in NDN. We borrow the idea of using a simple greedy forwarding method to spread Interest from Vehicular NDN (V-NDN) in [23]. However, instead of spreading Interests in all directions, we restrict the spreading of Interests in a certain area to suppress the broadcasting storm. In addition, we introduce the \"reverse-path routing\" for Data packets, which has not been discussed in V-NDN. We have compared the performance of our method with that of using V-NDN in Section 4. Names are coupled with the locations where the data are held in Navigo [24]. In order to avoid the packets focusing on a single destination area for a long time, Interests are either forwarded according to the FIB with a probability \(p\) or simply flooded with a probability of _1-p_. However, the purpose of the mechanism is not to suppress broadcast storms, but to balance the traffic from different sources. In addition, both [23] and [24] discuss only forwarding Interests; forwarding the responses carrying the requested data (i.e., Data packets) has not been discussed. The mechanism proposed in this paper considers forwarding of both Interest and Data packets. In work [25], the authors consider two ICN-specific design options, data source selection policies and caching policies. For the data source selection policies related to our work, Nearest Replica Routing and Original Source-Only Routing are considered as the two fundamental policies. Similar to [23], a broadcast-based shortest path geo-forwarding is used as the forwarding mechanism. Although the shortest intersection routes identified in the area map are used, the Interest is spread to all directionsand no restrictions are used. Compared to this work, we limit the spreading of the Interest packets, which may considerably reduce the number of Data packets in the network since in-network caching is used in ICN and many nodes can respond with Data packets.