Improved Radio Network Dimensioning for Real-Time Polling Service on IEEE 802.16 Wireless Networks with QoS Consideration

Thiaw Seng Ng, Teong Chee Chuah, Yi Fei Tan
2012 International Journal of Communications, Network and System Sciences  
Recently, applications of real-time polling service (rtPS) in IEEE 802.16 wireless networks have gained considerable popularity. These applications generate large amounts of real time traffic in the network and thus maintaining the quality of service (QoS) such as packet delay requirement in rtPS dominant networks is critical. Existing dimensioning methodology does not consider QoS parameters of rtPS in network dimensioning. Moreover, exhaustive and time-consuming simulations are required to
more » ... are required to evaluate the performance and QoS of rtPS. To overcome this problem, we propose an improved radio network dimensioning framework which considers QoS parameters of rtPS in network dimensioning. In this framework, an analytical model is developed to evaluate the capacity and performance of rtPS in IEEE 802.16 wireless networks. The proposed framework provides a fast and accurate means of finding the trade-off between system load and packet delay, thus providing network operators with an analytical tool that jointly considers coverage, capacity and QoS requirements for obtaining the minimum number of sites required. The accuracy of the proposed model is validated through simulations. 193 rtPS dominant network [7] . Thus the key concern in resource allocation for rtPS traffic is fulfilment of the delay requirement while maintaining the required capacity. To date, the impact of QoS parameters on site capacity has not been quantified and no QoS parameters for rtPS are considered in network dimensioning. Therefore, network dimensioning for acceptable packet delay while achieving the highest data throughput is a challenging and important issue. An improved dimensioning methodology which incorporates the delay requirement of rtPS into network dimensioning is desirable. In order to consider the delay requirement of rtPS in network dimensioning, a model which can be used to derive packet delays analytically for different SINRs is required. Packet delays are typically obtained through network simulations [8], a process which is time consuming and renders network dimensioning a challenging task. In the current work, we overcome this problem by introducing an analytical approach to obtain the packet delay information. There have been several studies which derive system capacity analytically [9,10]. In [9], the throughput and packet-access-delay performance of BE services are analyzed using a simple fixed-point method without considering the SINR. In [10], radio resource management is studied analytically where bandwidth adaptation and connection admission control are analyzed for all types of traffic. However, the works in [9,10] do not consider rtPS applications. To the best of our knowledge, no analytical study of network capacity planning with significant rtPS traffic has been carried out. To fill this gap, in this paper, we propose an effective dimensioning framework for rtPS traffic in IEEE 802.16 networks such that the throughput requirement is satisfied while achieving a good compromise between resource utilization and delivery delay. In particular, an analytical model which complements the dimensioning process, is developed to investigate some important performance measures such as packet delay and average SINR of a cell. Extensive simulations have been carried out to verify the proposed analytical model. The contributions of this paper are summarized as follows: 1) An analytical model which considers AMC and network SINR is developed to evaluate packet delays at different levels of cell load. A matrix geometric method is adopted to obtain some performance measures analytically; 2) The performance of IEEE 802.16 networks with rtPS as the dominant service is studied using the model developed; 3) An effective dimensioning framework, which incorporates QoS requirements such as packet delay and minimum throughput required, is proposed. The proposed network dimensioning framework gives the minimum number of sites required as the output by jointly considering coverage, capacity and QoS requirements. The current work provides network operators with an T. S. NG ET AL. Copyri 2012 SciRes. IJCNS 194 Derive network capacity Network traffic Packet delay Derive network coverage
doi:10.4236/ijcns.2012.53024 fatcat:ccvkzboatjejbfvmti2mbnrv2q