Optimal radio access technology selection on heterogeneous networks

Abstract

ElsevierPacheco Páramo, DF.; Pla, V.; Casares Giner, V.; Martínez Bauset, J. (2012) AbstractThe joint management of radio resources in heterogeneous networks is considered to raise the resource occupation efficiency. We propose joint schemes for admission control and access technology selection with vertical handoff. We determine optimal policies for a radio systems that support two multiple access techniques, TDMA and WCDMA, covering the same geographical area. In addition, the system under study also supports both streaming and elastic traffic. First, we explore different optimization criteria expressed in terms of blocking probabilities and throughput. We accomplish an exhaustive numerical analysis that allows us to characterize the optimal admission policies according to the arrival type and system load. Based on this characterization, we design heuristic policies and compare their performance to ones obtained by previously proposed schemes. This analysis is also done when constraints are added to provide QoS. Second, we also study an extension of the previous system that includes vertical handoffs, in order to evaluate their impact on the system performance. For the four types of vertical handoffs considered, we determine and characterize optimal policies according to the arrival type, system load and vertical handoff action. Since it is not feasible to calculate the optimal policies online, new heuristic policies with vertical handoff are constructed and evaluated. Finally, in order to take into into account the cost of performing vertical handoffs, a new optimization problem is formulated that relates voice and data blocking with vertical handoff costs.

Optimal Radio Access Technology Selection Algorithm for LTE-WiFi Network

“…Among the other network-initiated RAT selection schemes, [12]- [17], [21]- [22] consider various optimization approaches. In [12], optimal RAT selection problem is addressed in a HetNet to optimize throughput, blocking probability, etc.. Since the associated algorithm scales exponentially with the system size, authors also propose a computationally efficient heuristic policy.…”

Radio Access Technology Selection in Heterogeneous Wireless Networks Using a Hybrid Fuzzy-Biogeography Based Optimization Technique

“…RAT selection parameters [5] are based on the following four metrics-QoS guarantee, User satisfaction rate, preference of the operator, RAT availability condition. The selection for RAT may be based on any of these individual metrics or with that of the combination of all the four metrics.…”

“…In a manner, to design a simple but an accurate process for RAT selection out of the 14 parameters from the given 4 metrics, the prominently used parameters [5]-Speed of the mobile terminal, Received Signal Strength, Network Coverage, Delay and Data rate of QoS are selected to carry out the process. Thus, this paper uses these five parameters as the input signals for the proposed algorithm.…”

“…Pacheco-Paramo et al [5] presented joint schemes for admission control and access technology selection with vertical handoffs improve their capacity of radio resources in heterogeneous networks. Aryafar et al [6] performed two general classes of throughput models that capture the basic properties of scheduled access (e.g., WiMAX, LTE, 3G) and random access (e.g., Wi-Fi) networks, then frame the problem as a non-cooperative game, and study its efficiency, convergence and practicality.…”

Optimal Joint Call Admission Control with Vertical Handoff on Heterogeneous Networks

“…Inferred from the optimal policies obtained in [16], four vertical handoff types are defined: The system that uses vertical handoff types I and II is called VH-A, the one that uses all types is called VH-B, and the one that does not use vertical handoff is called NVH.…”