Sharif Digital Repository

Thorough investigation of the Cloud-RAN (C-RAN) architecture has recently shown that CRAN can bring advanced cooperated and coordinated processing capabilities as well as the multiplexing gains toward future radio access networks. The baseband processing of each base station instance can now be flexibly split into smaller functional components, that can be placed either at remote radio units (RRUs) or baseband units (BBUs), depending on the available resources. In this project, we investigate recent implemented methods in C-RAN. also, we propose, develop and implement new architectural frameworks for C-RAN that can support both a flexible functional split and a new functional splitting known... 

In the fifth generation of mobile networks there is a move to replace hardware with software. Meaning that instead of buying dedicated hardware for mobile networks, we only need some general-purpose hardware and will run virtualized network functions on top of that using software. Besides, in the past few years there has been a handful of great opensource cloud management tools that facilitates management of infrastructure and has accelerated this move towards softwarization. Some of these include ONAP, Openstack and Kubernetes. These tools help network engineers to sofwarize functionalities that where previously run on dedicated hardware and manage them automatically. In this project we... 

As mobile networks have been expanded, the importance of subscribers' information security has become more and more evident. Despite mitigating known vulnerabilities of older mobile networks in newer generations, there are still some security flaws that can be exploited. In particular, as a common scenario, attackers can exploit "Use 2G mobile network if 3G/4G is unavailable" setting in order to force a subscriber to downgrade his/her mobile network to 2G; hence becoming vulnerable to known 2G attacks. Mobile networks have a heterogeneous and distributed architecture which make intrusion detection systems incapable of covering the entire network. In this dissertation, alongside with the... 

There is an increasing demand from mobile users for higher bandwidth, lower latency, longer battery life and better quality of service. It is expected that the next generation of mobile networks standards which is called 5G meets most of these demands. It is expected that the enhanced features of the mobile networks can be achieved within the limited bandwidth which is offered by the regulators and therefore, one of the key challenges in the development of these new technologies would be the issue of resource allocation. Efficient allocation of frequency, time and power to different users is an important issue and therefore, one of the important areas of development in these standards has... 

With the fast-growing mobile networks, the need for network reliability increases. Various events like antenna failures, attacks on mobile networks, floods, sporting events cause abnormal behavior in mobile networks. Some events like antenna failures and attacks need consideration. But some of them like sporting events can be ignored. Right now, most mobile operators, detect these events manually which is a very time-consuming and costly task for them. To overcome this problem one idea is to predict future data by prediction algorithms. Then compare new data with the predicted one. If there exists significant deviation, there is an anomaly. But most of the failures and anomalies in mobile... 

The growth of user traffic and appearance of new services, has changed architecture of mobile networks. Data flows have different requirments based on their services. Mobile platform should be able to recognize services and slice network resources based on them. Different approaches have been investigated using relevant standards and numerous articles. The focus of this thesis is on implement a platform based on fourth generation mobile networks that can differentiate between data flows according to their respective required QoS.We have implemented an IMS network and connected it to a mobile core network But IMS network just supports session-based services. We introduced a solution for non... 

With the emergence of the 5th generation cellular networks, response time is becoming increasingly more important. One of the solutions to satisfy this requirement is using mobile edge computing. MEC is bringing the cloud computing features to the edge of the network and reduces services response time by reducing the user distance to her services. But for this solution to be effective, we need to migrate user services based on their movements. The main problem in migrating services is predicting user route and do the migration based on these predictions. We must do this procedure in a way that minimizes the service outage. In this research, we predict the user route with the historical... 

Considering energy efficiency ways a key role in designing future wireless networks( 5G mobile networks). Moreover Spectrum efficiency is another critical issues in designing wireless networks. Cognitive radios can improve the spectrum efficiency. On the other hand, radio frequency (RF) energy harvesting has emerged as a promising technique to supply energy for wireless networks and thereby increase their energy efficiency. In this thesis, we propose a new technique for the RF-powered CRNs.To this end,We consider a cognitive radio network comprised of a primary user and a secondary user. The primary user, uses a typical frequency band for transmit data in a time slot basis and both the...