Communication Protocol Engineering Lab. A Survey Of Converging Solutions For Heterogeneous Mobile IEEE Wireless Communication Magazine December 2014 Minho.

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Communication Protocol Engineering Lab. A Survey Of Converging Solutions For Heterogeneous Mobile IEEE Wireless Communication Magazine December 2014 Minho Jo, T. Maksymyuk, R. L.Batista, T.F.Maciel, Andre L.F. De Almeida Chan Uk, Kang Kwangwoon Univ. Communication Protocol Engineering Lab. IEEE Wireless Communication Magazine December /17

Communication Protocol Engineering Lab. Contents  Introduction  Overview of Converged mobile network development  Wireless heterogeneity in Mobile converged networks  Interference avoidance problems in mobile converged networks  Conclusion IEEE Wireless Communication Magazine December /17

Communication Protocol Engineering Lab.  Since the number of mobile multimedia content users has increased dramatically, a serious problem over limited spectrum resources has arisen. -Research has recently begun investigating increasing available spectrum resources by integrating several network resources into a single mobile network. -Networks acts independently using its own frequency band.  The advent of LTE technology has allowed high throughput applications for mobile users.  Development of hardware have accelerated mobile service development, requiring plenty of spectrum bands. Introduction IEEE Wireless Communication Magazine December /17

Communication Protocol Engineering Lab.  A popular topic in the current information and communication technologies area is cloud computing.  It is recognized as a next-generation computing infrastructure. -Cloud services enable users to adaptively utilize resources. -Cloud allows Service providers to easily implement mobile applications with minimal management effort.  Requiring much higher performance, LTE networks are not able to properly support them.  Some new technologies for increasing performance have been proposed over the last few years. -Convergence of heterogeneous wireless access techniques is one of the key solutions for 5G mobile networks.  Mobile converged networks are used as a users access many kinds of mobile services (regardless of location / connection type / device). Introduction IEEE Wireless Communication Magazine December /17

Communication Protocol Engineering Lab.  The converged mobile network allows users to effectively utilize the multiple operating in standards. -Users can be reallocated between different types of network without session interruption, or even simultaneously utilize resources from different networks.  We provide, -Overview of converged (heterogeneous) mobile networks. -Discuss key problems. -Existing solutions for the coexistence of different wireless protocols within the same spectrum band. Introduction IEEE Wireless Communication Magazine December /17

Communication Protocol Engineering Lab.  LTE-A was the first step toward network heterogeneity due to relay transmission possibilities. -They were not heterogeneous at first, because they used only a single protocol and shared the same licensed spectrum.  The latest development allows sharing different unlicensed spectrum bands for relay transmission. -Supports effective handover between LTE-A cellular networks and Wi- Fi or Bluetooth networks. -Convergence of two different network protocols, Wi-Fi and LTE-A, is achieved via connection of fixed Wi-Fi access points with LTE-A core networks through fixed or wireless relay transmission. Overview of Converged mobile network development IEEE Wireless Communication Magazine December /17

Communication Protocol Engineering Lab. Overview of Converged mobile network development  Three main types of converged mobile networks -Device convergence / Protocol convergence / Service convergence IEEE Wireless Communication Magazine December /17

Communication Protocol Engineering Lab. Overview of Converged mobile network development  In order to achieve full convergence in mobile networks, a lot of technical problems must be solved. -A wide range of new data transmission methods over wireless channels must be developed. (ex. energy-efficient modulation, coding techniques, improved spectrum sensing, radio resource management algorithms) -New wireless transmission protocols for each network (LTE-A, Wi-Fi, M2M) must be developed in order to achieve full interoperability between them. -The existing leading air interfaces, based on OFDMA and MIMO antennas, must be improved to fit the demands of future converged networks. -There must be a single signaling layer for the entire converged network in order to maintain for QoE. IEEE Wireless Communication Magazine December /17

Communication Protocol Engineering Lab. Wireless heterogeneity in Mobile converged networks  M2M allows users to utilize multiple communication interfaces while sharing network access with other users. -M2M networks usually use Wi-Fi or Bluetooth network protocols. -But, these protocols provide transmission capacity smaller than cellular network protocols like LTE-A and WiMAX.  New spectrum reforming methods and algorithms were proposed due to utilizing the unlicensed band for cellular networks -As further development of M2M and cellular convergence networks, devices in the M2M network can share the unlicensed spectrum of cellular networks like LTE-A. -M2M can reduce the transmission load and increase performance. IEEE Wireless Communication Magazine December /17

Communication Protocol Engineering Lab. Wireless heterogeneity in Mobile converged networks IEEE Wireless Communication Magazine December /17

Communication Protocol Engineering Lab. Wireless heterogeneity in Mobile converged networks  Future M2M networks will be based on fully connected topology, which can achieve the best performance. 1.The performance of end-user devices must increase in order to support multiple simultaneous connections. Converged heterogeneous networks require a new protocol stack and a multiservice service-oriented platform in order to support emerging services. It is necessary to develop new algorithms for traffic management in mobile networks with different services and effective utilization of network resources 2.The new algorithms should be designed for a converged mobile network’s control plane. Solution for mobile network management is softRAN The virtual base station includes a central controller, a physical base station, and master devices of M2M networks. SoftRAN architecture provides load balancing and interference management, as well as throughput and traffic control. 3.Most important problem is address interference. Interference limits network performance greatly. IEEE Wireless Communication Magazine December /17

Communication Protocol Engineering Lab. Interference avoidance problems in mobile converged networks  Most urgent problem in the M2M/cellular converged network is coexistence between cellular and M2M transmissions within one spectrum. IEEE Wireless Communication Magazine December /17

Communication Protocol Engineering Lab. Interference avoidance problems in mobile converged networks  A simple and suitable solution is for the transmission power of M2M devices to decrease within the M2M network. -This will cause significant interference in neighboring cells when reusing the same frequency. -Decreasing cellular transmission power will lead to significant imbalance between uplink and downlink coverage. IEEE Wireless Communication Magazine December /17

Communication Protocol Engineering Lab. Interference avoidance problems in mobile converged networks  Co-channel interference management is important to allow direct transmissions between devices reusing radio spectrum of cellular networks.  Coordinated multipoint (CoMP) is a promising solution able to mitigate and avoid high co-channel interference. -CoMP schemes will play an important role in allowing the coexistence of converged networks, M2M communications. -Cellular networks within the same spectrum will offer potentially high benefits for future wireless networks in terms of spectrum utilization and cellular coverage. IEEE Wireless Communication Magazine December /17

Communication Protocol Engineering Lab. Interference avoidance problems in mobile converged networks  Distributed-input distributed-output (DIDO) wireless technology is a new revolutionary approach to multiuser data transmission in wireless networks. -This technology allows utilization of the entire spectrum by each user, in spite of sharing the same spectrum between many users. -DIDO provides each wireless user with full data rate (in bits per second) of shared spectrum simultaneously with all other users by removing interference between users sharing the same spectrum. -The data rate per user keeps the full data rate of the spectrum as more users than traditional wireless technologies. IEEE Wireless Communication Magazine December /17

Communication Protocol Engineering Lab. Interference avoidance problems in mobile converged networks  For future converged networks, a higher number of cells (macro-, micro-, pico-, and femtocells) are expected.  CoMP schemes could be further used for converging networks to coordinate transmission on different scales. IEEE Wireless Communication Magazine December /17

Communication Protocol Engineering Lab. Conclusion  This article has surveyed the key challenges and candidate solutions for the convergence of current wireless standards toward a heterogeneous mobile network scenario.  Key problems related to the coexistence of the different wireless standards (cellular, broadcast, Wi-Fi, and Bluetooth) within the same spectrum band have been discussed.  The integration of CoMP and M2M in a converged heterogeneous network entails a number of research challenges ranging from cell identification to physical and MAC layer problems such as interference coordination and scheduling.  These issues open new perspectives for research in 5G wireless communications. IEEE Wireless Communication Magazine December /17