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RRM and QOS Provisioning for 4G

Active Project 3:  RRM and QoS provisioning for 4G networks

Radio Resource Management (RRM) and Quality of Service (QoS) provisioning are critically important in the next generation of wireless technologies such as 4th Generation (4G): Worldwide Interoperability for Microwave Access (WiMAX ) and Long Term Evolution (LTE).  The RRM-QoS subgroup of UNHwRG focuses entirely in this area of research. This ongoing project in the UNHwRG first started in the year 2011, and continues with 1-2 student residences working on different aspect of the project every year.  Active projects in this area are listed below.


Students involved:

Navid Safavi(2011), Abhishek Para (2011), Seydemohammad Salehi (2012-2013), Joswill Rodriguez (2013-2014)


  1. A. Esmailpour, S. Salehi, and N. Safavi. "Quality of Service Differentiation Measurements in 4G Networks", Proceedings of the Wireless Telecommunications Symposium (WTS-2013), 17-19 April 2013. Pages 1 – 5. Phoenix, AZ, USA, 2013
  2. J. K. R. Burugulla, A. Deep, N. Safavi, and A. Esmailpour. "Overview of WiMAX Technology Security and Quality of Service Issues". The American Society of Engineering Education (ASEE2013), March 2013.[Student Poster Presentation] 
  3. S. Gurjar, J. K. R. Burugulla, K. P. Tummalapalli, and A. Esmailpour." Advances in the 5th Generation (5G) of Wireless Network Technologies". The American Society of Engineering Education (ASEE2013), March 2013. .[Student Poster Presentation] 
  4. A. Esmailpour. "Quality of Service Support in Unified 4G Networks". The eight International conference on IT Innovation 2012, Al Ain, UAE. IIT'12
  5. Navid Safavi, Abhishek Para and Amir Esmailpour. “A Quality of Service Scheme for LTE Networks”, 2012 ASEE Northeast Section Conference

Summary of the sub-projects in RRM-QoS:

a)    A 2-layer packet scheduling and bandwidth allocation framework for integrated 4G technologies

Team member in charge: Joswill Rodriguez 

Team members involved: Mohammad Salehi

Status: Active, 2013-2014


The goal of this research is to design and develop a 2-layer packet scheduling and bandwidth allocation framework for integrated 4G wireless networks. Since IEEE define the standards for WiMAX, whereas 3GPP defines them for LTE. One major goal of these technologies is to focus on interoperability and interworking between them. This will enable the users to exchange data without worrying about the source or destination networks, as well as vertical handover. This investigation focuses on the radio resource management (RRM) area for these 4G wireless networks, specifically the quality of service (QoS) interoperability.

The objective of RRM is to increase the usability of the scarce radio-frequency spectrum and the network infrastructure. To achieve this RRM implements the QoS techniques among others. Quality of service is composed by a set of parameters that must be guaranteed in order to fulfill the traffic requirements. The motivation for this research will be to attempt to close the gap that remains open in the 4G wireless network and standards concerning the Quality of Service, along with the differences in the networks RRM. The expected outcome is a decrease in the delay, while increasing the throughput, and also enabling the interoperability of the devices in the networks. The planned implementation of this project will be to test and verify the results in OPNET Modeler. This simulator has both network models while collecting the required data to measure any increase in the networks’ performance. At this moment, this project is in the literature review and background stages.

b)   Impact of a Two-Layer QoS-Aware, Channel-Aware Packet Scheduler on End-to-End Delay and Throughput of LTE networks

Team member in charge: Seydemohammad Salehi

Team members involved: Joswill Rodriguez  

Status: Completed 2013, Thesis published


Future of wireless and mobile technologies will rely heavily on unifying the current existing solutions to have ubiquitous data acquisition. Cellular networks play a dominant role due to their large coverage area and greater portability. One of the promising technologies, evolving quickly to reach the 4G specifications is 3GPP’s LTE, which is already adopted by service providers around the world. LTE has drastic improvements both in its core network (CN) and Radio Access Network (RAN) in comparison with its predecessors. Adopting several new technologies such as MIMO, adaptive modulation scheme, OFDMA/SCFDMA combo, etc. has led to many achievements on the Radio Access Network side. Moreover, elimination of the Circuit Switch (CS) network from the Core Network side has made LTE a fast all-IP network suitable for many of today’s delay sensitive applications.

An important functionality within the radio access network is packet scheduling and bandwidth allocation. On the one hand, Quality of Service (QoS) demands of users are different and should be satisfied. On the other hand, wireless environments have many inherited characteristics such as variable channel conditions, multi-path interference and fading that should be taken into account when designing a packet scheduler. The packet scheduler takes in to account the channel condition experienced by each user to overcome channel variants of wireless contexts. Also, it tries to have a trade-off between computational complexity and fairness to achieve QoS provisions.

We propose a two-layer channel-aware and QoS-aware packet scheduler. This packet scheduler tries to satisfy QoS needs and improve the efficiency of higher priority applications at the cost of being unfair to lower priority queues. It does this by classifying QCI queues into three groups in the first layer (Inter-group scheduling) and then serving groups based on their priority. We use the OPNET Modeler to simulate our PS and bandwidth allocation Scheme and verify our results through analytical work as well as laboratory implementation.

c)  Quality of Service Differentiation Measurements in 4G Networks

Team member in charge: Amir Esmailpour

Team members involved: Navid Safavi, Seydemohammad Salehi

Status: Completed, published


Quality of Service (QoS) differentiation measurement provides the ability to evaluate different level of QoS support in 4G networks such as Long Term Evolution (LTE) and Worldwide Interoperability for Microwave Access (WiMAX). Many research studies around the world have addressed  the QoS Differentiation (QoS-Diff) considerations, however, to the best of our knowledge, only a few have attempted to make measurements and evaluate the level at which each QoS solution could provide differentiated services to users and applications in demand.   In this study, we provide a method to evaluate such differentiated level of service by means of User as well as Service Provider satisfaction levels, and use a new parameter to measure them.  By simulation results, we show that this parameter could provide detailed information about QoS-Diff measurements and how users and service providers perceive their service delivery experience.

d)   A Quality of Service Scheme for LTE Networks

Team member in charge: Navid Safavi, Abhishek Para

Team members involved: Amir Esmailpour

Status: Completed 2012, paper published


Mobile broadband usage has gone through an exponential growth rate in recent years within the cellular network technologies across the world, deriving the market with the widespread of new advanced mobile and smartphones. Service providers are turning to multi service applications, such as multimedia, real-time and IPTV. These kinds of services have different types of bandwidth needs and accordingly different Quality of Service (QoS) requirements. In order to provision QoS and deliver proper requirements for different services Radio Resource Management (RRM) strategies are applied such as Admission Control (AD), Packet Scheduling (PS), and Bandwidth Allocation (BA). Level of service is characterized by parameters such as throughput, latency, jitter, and packet loss ratio, and different service levels are specified for different types of traffic. Network classifies different types of traffic and applies different RRM processes to achieve the proper service level for each traffic class.

Our sample network is a LTE network including one eNB and 5 users, users are classified to use 2 applications: interacting voice and background traffic. Three users are chosen to use Voice application and the rest to use background traffic. Two layers of QOS is performed here, interclass  which Packet Scheduling algorithm applies to incoming  traffic from eNodB to distinguish voice from background traffic, and Intra-class in which Deficit Waited Round Robin algorithm is applied to bring QOS to the users s using voice traffic.



e)    Quality of service provisioning in WiMAX networks

Team member in charge: J. K. R. Burugulla,

Team members involved: A. Deep, N. Safavi

Status: Completed 2012, published


WiMAX is abbreviation for Worldwide Interoperability for Microwave Access, based on the IEEE 802.16 set of communication standards. WiMax intended to be for metropolitan area network (MAN), designed to provide high speed downlink and uplink accesses to mobile users covering large radius over 50 miles for fixed stations and 3-10 miles for mobile stations. A single WiMAX station can operate and provide coverage for hundreds of users at a time and manage sending and receiving data at high speed with full network security; it is also designed to provide services in Line of Sight (LOS) and No Line of Sight (NLOS) modes for both point to point and point to multi-point users with the required Quality of Service (QoS) and security measures. Due to its low cost of network deployment (compare with 3G, HSDPA, xDSL, HFC or FTTx) it is now economically capable of growing to provide broadband Internet access in remote locations where either other services are too expensive to deploy or not reachable. Mobile WiMAX was a replacement candidate for cellular phone technologies such as GSM and CDMA, and using it as an overlay to increase capacity is an example of Mobile WiMAX applications. Many Wireless Internet Service Providers (WISPs) around the world offer 4G internet access to their clients using WiMAX network. The evolution of WiMAX standard series include IEEE 802.16, 802.16a, 802.16d, 802.16e, and 802.16m in which system can support both 120 Mbit/s downlink and 60 Mbit/s uplink per site simultaneously, with a wide coverage area, security and QoS support for various service types. In this poster, we will provide a comprehensive overview of WiMAX technology, with emphasis and proposals for the Security and QoS mechanisms of WiMAX.