تخصیص منابع هوشمند برای بهبود QoE در زیرسیستم های چند رسانه ای IP Smart resource allocation for improving QoE in IP Multimedia Subsystems

1. Introduction IP Multimedia Subsystem (IMS) is the result of a set of protocols and network architectures, which defined according to (Silverajan, 2017) as a set of specifications that describe the Next Generation Networking (NGN) architecture for implementing IP (Internet Protocol) based on telephony and multimedia services. Moreover, in (IMS, 2017), IMS is described as an integrated network of telecommunication carriers that facilitate the use of IP for packet communications in web services, voice over IP (VoIP), instant messaging (IM), video conference sessions and video on demand (VoD). IMS has taken a very important role in network services which can be achieved by heterogeneous networks and different access technologies. Further, IMS can be used to manage all service related issues such as Quality of Service (QoS), Access Control, User and Services Management, etc. Consequently, in (Chang et al., 2010), authors present a good survey of IMS. It discusses the different impacts. One of the most challenging issues in IMS is still the reduction of the resource usage and the system energy consumption. Although, in many cases, the lack of their control makes the issue worse. Moreover, the power consumption of IMS also depends on the design of the system architecture and the number of connected end-users to receive multimedia services. IMS was initially developed as the evolution of next-generation mobile phone and standardized by the Third Generation Partnership Project (3GPP). ETSI-TISPAN working group (Etsi Tispan, 2008), extends its functionality to fixed transport technologies, a network architecture is developed to support IMS and the QoE is guaranteed to the users. One important aspect in IMS is to ensure a good QoE and to design an IP platform that could transport any kind of service to guarantee the QoE (Tsolkas et al., 2017), while the power consumption and the battery life of the devices are reduced (Wuthnow et al., 2009). IMS core networks can be used to assign policies for each service by controlling the different QoS mechanisms (Soldani et al., 2007). Policies can be applied to various bandwidth parameters and codecs for different subscribers.