# Proxy-Based Adaptive Transmission of MP-QUIC in Internet-of-Things Environment
## 5 Discussion  
This paper has proposed an enhanced MP-QUIC scheme for throughput enhancement in an IoT environment. In the proposed scheme, a proxy device is employed between IoT clients and IoT servers to aggregate the traffics of many clients in the access network. The proxy device transmits aggregated IoT traffics to the server, based on dynamic network conditions, by using multiple paths in the backbone network. The proposed scheme is also featured by adaptive MP-QUIC transmission, in which the proxy employs a path  
Figure 10: Comparison of response delays for different number of clients.  
Figure 9: Response delays for different link delays when all packets have the same priority.  
manager to monitor the current network conditions, and a connection manager to manage the MP-QUIC connections with the IoT server over the backbone network with multiple paths. In MP-QUIC data transmissions, the prioritized packets are delivered to the server by using the path with the lowest network latency, whereas the non-prioritized packets are delivered over the paths with low utilization for traffic load balancing in the network.  
It is noted that the Social IoT (SIoT) services have recently been studied [23; 24; 25]. SIoT can be used to interconnect many IoT objects over the world and to create a social network based on common interests and motivation. SIoT addresses how to effectively combine social networks with IoT, which is related to the interaction between things and the Internet as a network substrate [23]. For this purpose, a variety of technical issues have so far been discussed [24]. To support a variety of SIoT applications, the different software platforms from the conventional IoT platforms may need to be considered by utilizing the SIoT features [25].  
The proposed proxy-based MP-QUIC scheme can be integrated with the SIoT architecture so as to more effectively provide the SIoT services. In general, a large number of IoT devices are involved into the SIoT services, and these IoT devices can be categorized into several groups, based on their geographical locations and common interests. Each group can be assigned to a specific MP-QUIC proxy, and the proxy will communicate with a different proxy or the central SIoT server by using the proposed MP-QUIC scheme so as to enhance the transmission throughput. That is, the proposed proxy-based MP-QUIC scheme will be suitable to provide the scalable SIoT data delivery.  
More recently, the Multiple IoTs (MIoT) paradigm has been proposed as an extension of SIoT [26; 27; 28]. MIoT is a set of inter-related SIoT networks. In [26], the authors investigated the possibility of applying the ideas underlying Social Internetworking System to IoT, and they proposed the MIoT paradigm. MIoT addresses data-driven and semantics-based aspects because it considers the contents exchanged by smart objects during their transactions. Under the MIoT definition, SIoT can be viewed as a specific case of MIoT in which the number of the possible kinds of relationship is limited. SIoTs are interconnected via the so-called _cross nodes_. Then, a _cross node_ connects at least two SIoTs of the MIoT. In [27], the authors define the concept of _scope_ in MIoT, and they propose the formalizations of this concept. In [28], the authors propose a theoretical framework to handle anomalies in multiple IoT scenarios with the definition of anomaly taxonomies.  
The proposed proxy-based adaptive MP-QUIC transmission scheme can also be integrated into the MIoT framework, in which an SIoT consists of a set of IoT objects with the common interests, and these IoT objects are connected to the MP-QUIC proxy. The MP-QUIC proxy can be regarded as an MIoT _cross node_ which will communicate with the other MP-QUIC proxy that represents another SIoT group. In this way, many SIoTs can be inter-connected via MP-QUIC proxies in the MIoT framework, and the proposed adaptive MP-QUIC transmission scheme can be used to provide real-time and reliable data transmission among the MP-QUIC proxies in the network.