Low Complexity Resource Allocation Techniques for Symmetrical Services in OFDMA Systems
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Low Complexity Resource Allocation Techniques for Symmetrical Services in OFDMA Systems P. S. Swapna1 · Sakuntala S. Pillai1
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The popularity of symmetrical services like video conferencing, telemedicine etc. is in an upsurge. With the rapid increase in the number of customers for such services, the demand for reliable and computationally feasible resource allocation techniques satisfying all the users are also intensifying. This paper proposes two computationally feasible techniques for allocation of resources in OFDMA system specifically for services that demand similar quality in the uplink and downlink directions. The resource allocation problem is multiobjective in nature with the objectives to maximize the data rates in both directions meanwhile minimizing the difference in the bidirectional data rates for each user. Fairness has been incorporated as a major constraint in the formulation of the optimization problem. Equal Power allocation and weighted sum method are implemented for power allocation while subcarrier allocation is carried out using an evolutionary technique. The solution for subcarrier allocation is represented in a novel manner such that the complexity is reduced to a great extent at the same time attaining acceptable data rates. Keywords Adaptive resource allocation · Multiobjective optimization · Weighted sum method · Evolutionary algorithm · Hexadecimal representation
1 Introduction The telecommunication industry has been constantly under updation, to satisfy the Quality of Service (QoS) requirements of its end users. The demand for data rate and quality performance has been tremendously increasing worldwide. In this respect, the global smart phone industries have been enriching their device with a wide range of features to promote their product. Applications of smart phones comprise of sending and receiving e-mails, surfing, making video calls, gaming, ubiquitous health monitoring and wellness
* P. S. Swapna [email protected] Sakuntala S. Pillai [email protected] 1
Department of Electronics and Communication Engineering, Mar Baselios College of Engineering and Technology, Trivandrum, India
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management. Current widespread applications like video conferencing, mobile gaming, telemedicine etc. necessitate similar quality in both directions. The infrastructure of the existing wireless system is not sufficient for the implementation of networks specifically for symmetrical services since the resources are non-intersecting in both directions and therefore cannot guarantee the flow availability in both directions [1]. Planning of resource allocation for systems aiming at performance enhancement of symmetrical services has to be approached in a different manner when compared to single direction resource allocation. Symmetrical services are applications which demand approximately similar data rate and performance in both uplink and downlink direc
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