The UTRAN consists of a set of Radio Network Subsystems connected to the Core Network through the Iu. The Iu interface has two flavours: the Iu-CS, connecting to the Circuit-Switched-domain, the Iu-PS when connecting to the Packet-Switched-domain. A Radio Network Subsystem (RNS) consists of a Radio Network Controller and one or more Node Bs. A Node B is connected to the RNC through the Iub inte...

Mobility of the wireless user creates uncertainty in demand and non-optimum use of radio resources. Current wireless networks are periodically re-configured manually to improve network performance. These network reconfiguration and performance optimizations consume thousands of engineering hours and are often done by trial and error. However, the benefit of these efforts will be minimized as in...

This paper introduces various techniques for a new fronthaul network segment applied in centralized radio access networks (C-RAN) architecture. The promising fronthaul interfaces are described which are considered to meet physical requirements for the fronthaul network segment and to build a new radio access network solution. Various optical solutions including CPRI (Common Public Radio Interfa...

multicast routing is one of the most important services in multi radio multi channel (mrmc) wireless mesh networks (wmn). multicast routing performance in wmns could be improved by choosing the best routes and the routes that have minimum interference to reach multicast receivers. in this paper we want to address the multicast routing problem for a given channel assignment in wmns. the channels...

In this paper we introduce a new, flexible radio access stratum security architecture for 5G mobile networks that supports a dynamic, flexible radio access network with multiple different security termination points for the control and user plane communication between a mobile device and the network. We describe key refreshing methods that allow to refresh user plane keys for individual radio l...

After successful dynamic spectrum access, cognitive radio (CR) must be able to relay the message/packets to the destination node by utilizing existing primary system(s) (PS) and/or cooperative/cognitive radio nodes in the cognitive radio network. In this paper, we pioneer the exploration of the fundamental behaviors of interference between CRs and PS in such a relay network via network coding. ...

Cognitive radio is one of the main technologies in the wireless communications. The cognitive radio networks are composed of cognitive, spectrum-agile devices which is able to modify their network configurations according to the spectral environment. This cognitive radio provides the chance reusing portions of the spectrum temporarily for the secondary users. But security is a main issue in the...

Many appealing multicast services such as on-demand TV, teleconference, online games and etc. can benefit from high available bandwidth in multi-radio multi-channel wireless mesh networks. When multiple simultaneous transmissions use a similar channel to transmit data packets, network performance degrades to a large extant. Designing a good multicast tree to route data packets could enhance the...