## 2 Related Work  
In this section we highlight some related works from recent years abut the topics related to our proposal: (i) video-streaming services over MANETs, (ii) QoS-aware multi-metric routing for MANETs, (iii) social MANETs. There are several proposals about _video-streaming services over MANETs_ in the last decade. The work [11] introduces an optimal rate control for video stream transmission to minimize both the client buffer utilization and the video transmission rate. The optimal sending data rate from server is analytically derived and the buffer occupancy is numerically calculated. The approach presented in [12] chooses the better quality links for routing instead of the minimum hop-count path. Then, they distribute the video-streaming to receivers by using multicasting in multi-channel Wireless Mesh Networks. They design a multicast version of the well-known AODV routing protocol to construct two disjoint multicast trees as the backbone for a peer-to-peer structure. Finally, they adopt the multiple description coding scheme to encode the video into two independent sub-streams and transmit them separately along those multicast trees. NS-2 simulations show that in higher traffic load environment, their scheme reduces latency and improves the packet delivery ratio. In [13], the authors propose a multi-objective function that minimizes the number of packets injected in the network and maximizes the path diversity among the different video encoding descriptions. They also propose a cross-layer congestion control strategy where the MAC layer is video-coding aware and adjusts its transmission parameters via congestion/distortion optimization, showing a gain in terms of PSNR and delay reduction. The authors in [4] propose a multipath game-theoretical routing protocol to transmit video-warning messages over MANETs. The considered scenario is a video-warning service in smart cities, so that when an accident happens, dynamic sensors (e.g., citizens with smart phones or tablets, smart vehicles and buses) shoot a video clip of the accident and send it through the MANET. Instead of sending video frames always through the best available path, users _play_ a strategic routing game according which video frames are sent through one of the two best paths according to a probability \(p\) that varies on some network features (e.g., number of nodes). Simulation results show the outcome of the proposal in terms of percentage of packets losses, end-to-end average packet delay and average delay jitter. Several works include proposals about _QoS-aware multimetric routing for MANETs_. The work [14] presents an on-demand routing adaptive protocol named adaptive quality of service routing (AQR), which takes into account the QoS parameters of bandwidth, delay and cost. AQR has QoS violation detection and recovery mechanisms which enables quick re-routing of the packets along new paths. NS-2 simulations show that AQR achieves the QoS performance claimed and adapts well to different topologies and mobility conditions. In [15] the authors present a modification of the basic AODV routing protocol able to create optimal routes considering the available bandwidth to fulfill the video stream requirements. The work [16] presents a power-aware on-demand routing protocol for MANETs using bandwidth and power information gathered from the 1-hop neighbors of the nodes, in order to improve path bandwidth and reduce the overall power consumption. Similarly, in [17] the authors introduce a fitness function technique to optimize the energy consumption in MANETs to find the optimal path from source to destination to reduce the energy consumption in multipath routing. The work [18] presents a game theoretical routing protocols for MANETs that improves QoS provision by focusing on the collaboration between nodes. Their approach minimizes the utility of malicious nodes and motivates cooperation between nodes by using a reputation system.