04-10-2016, 03:06 PM
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Abstract
In this paper we propose novel network architecture for next generation 5G mobile networks. The proposed architecture is based on user-centric mobile concept in heterogeneous wireless environment. The implementation of the proposed architecture is performed in the service
stratum, while the radio access technologies
belong to the transport stratum regarding the Next Generation Networks approach. In the proposed architecture the mobile terminal has the possibility to change the Radio Access Technology - RAT based on certain user criteria. For the purpose of transparent change of the RATs by the mobile terminal, we introduce so-called Policy-Router as a new node in the core network, which establishes IP tunnels to the mobile terminal via different available RATs to the terminal. The selection of the RAT is performed by the mobile terminal using user agent for multi-criteria decision making, which is using the newly defined QoS policy-based routing procedure.
Introduction
Today we have different wireless and mobile technologies, which are mass deployed, such as 3G mobile networks (UMTS, cdma2000), LTE (Long Term Evolution), Wi-Fi (IEEE 802.11 wireless networks), WiMAX (IEEE 802.16 wireless and mobile networks), as well as accompanying networks, such as sensor networks, or personal area networks (e.g., Bluetooth, ZigBee). Mobile terminals include variety of interfaces, including the GSM ones, which are based on old-fashioned circuit switching, the technology that is going into its last decade of existence. All wireless and mobile networks today are going towards all-IP principle, meaning all data and signaling will be transferred via IP (Internet Protocol) on network layer [1]. So, we may have different Radio Access Technologies (RATs) today and new RATs in the future (e.g., LTE-Advanced), but the common “thing” for all of them is IP, which is unifying technology. The 4Gterm is related to available bit-rates in the access link, i.e. more than 1 Gbps is set as condition by ITU for a technology to be marked as 4G. Also, all-IP is the characteristic of 4G in the access and in the core network part, there will be no circuit-switching as it existed in 3G systems, such as UMTS. On the other side there are a lot of efforts done for separation of transport stratum and service stratum in the concepts of Next Generation Networks (NGN), [2], [3]. Next generation of mobile and wireless networks will certainly need to fit within the NGN, because it is based on wireless and wired access possibilities, including all services and using all-IP concept. However, the main principle for NGN is complete separation in parallel between the transport part in the access and in the core networks from the service provisioning, i.e., from the service stratum. Since, the 4G is already at the “front door” of communication world, the next generation of mobile and wireless networks will be labeled 5G, if we continue the same pattern from the past two decades. We believe that the 5G approach will be user- centric approach [4], since the mobile terminals are becoming highly computationally capable devices which can support more complex functionalities for performing calculations, as well as bigger memory space and longer battery life in years will provide enough storage capability for control information. Then, in IP world, the main principle from the beginning was keeping simple network nodes and having smart end devices (e.g., computers), an approach completely different from the Public Old Telephone Systems (POTS). However, we need smart nodes on the networks side in all-IP concept as well, which should be used for negotiation with the user equipment premises (mobile terminals in the case of mobile networks) for providing necessary Quality of Service, as well as authentication, authorization, accounting and security functionalities. In this paper we provide complete functional architecture for 5G mobile networks. The main assumption in our approach is that the user will have the possibility to access different RATs from single mobile device at the same time, which is reality even today. Then, we propose establishing new network nodes for policy-based routing between IP tunnels to mobile user via different RATs, which are placed in service stratum of the network. We have invented several solutions for making fully functional the proposed 5G network architecture. The remainder of this article is structured as follows. Section 2 covers the models for interoperability in heterogeneous wireless environment. Section 3 presents the design of the network architecture for 5G mobile networks. In Section 4 we provide description of use-cases for the proposed 5G architecture. Finally, Section 5 concludes the paper. The remainder of this article is structured as follows. Section 2 covers the models for interoperability in heterogeneous wireless environment. Section 3 presents the design of the network architecture for 5G
mobile networks. In Section 4 we provide description of use-cases for the proposed 5G architecture. The proposed system for performance measurement in next generation wireless networks is given in Section 5. Finally, Section 6 concludes the paper. 2. Heterogeneous Wireless Networks Interoperability challenge in the design of the terminals is connected to the management of trade between the flexibility of how to use the spectrum and needed space and power to given platform. New methods for partial reconfigurable offer design dimensions that allow the system to adapt to the opportunities and requirements of the terminals in a manner that shall maximize the spectral efficiency and also maximize the battery power [4]. As a result of growing level of acceptance of the wireless technologies in different fields, challenges and types of wireless systems associated with them are changing. In heterogeneous wireless networks the concept is "always best connected" (always associated with the best quality), aimed at client terminals, and is proposed in different researches. This approach leads to the emergence for vertical handover between different radio accesses technologies