Abstract
This paper investigates relay selection and subcarrier assignment in cooperative OFDMA systems with considerations of QoS requirements. The joint resource allocation problem is formulated as a 0-1 integer linear programming problem with the objective of maximizing the system throughput. The efficient joint optimal algorithm is proposed to tackle the problem. By using the penalty function, the complicating constraints are included in the objective function and the special model with a totally unimodular constraint coefficient matrix is constructed that could be solved rapidly as a linear programming with reduced computational complexity. Numerical results show that the proposed algorithm significantly outperforms previous works in terms of both heterogeneous services support and QoS guarantees.
Highlights
Rapid growth of users and explosive growth of new wireless applications require high speed transmission and efficient utilization of system resources
Half of the users in the system are assumed to be real-constrained service (RC) users and the other half are best effort service (BE) users. These RC users have different rate requirements based on the applications and they are fixed for the whole simulation
It is observed that for the unconstrained algorithm, the rates vary a lot between different users and the minimum rate requirements are not fulfilled for users 3 and user 4 which means differentiated services are not supported in the system
Summary
Rapid growth of users and explosive growth of new wireless applications require high speed transmission and efficient utilization of system resources. Resource allocation supporting user’s QoS requirements for cooperative OFDMA networks was investigated in [1,2,3,4]. In [1,2,3], the authors investigated relay selection and subcarrier allocation in a cooperative OFDMA system with considerations of QoS guarantees and proposed a dual based QoS-aware schedule algorithm. In [4], the authors studied the energy-efficient radio resource scheduling with QoS guarantees in a cooperative OFDMA system.
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