Evaluation of OFDMA resource allocation algorithms in broadband wireless access networks

del-Castillo, Juan I.; Santos, Mireya; Villalón, José

doi:10.1007/s11235-011-9598-x

Cited by 8 publications

(5 citation statements)

References 8 publications

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“…The concept car based on 4G technologies is presented for various applications like infotainment, diagnostics and navigation, and it is shown that the system works very well up to speeds of 140 km/h when working at the transmission rate of 10 Mbps (Mosyagin 2010 ). The problem of power and sub-carrier allocation in OFDMA systems has been the subject of many researches (Zhu 2012 ; Del-Castillo et al 2013 ; Srikanth et al 2012 ). Capozzi et al ( 2013 ) summarize the key design issues of the downlink scheduling in the TD-LTE cellular networks and give a survey on the current research status with a performance comparison of the most well-known techniques of LTE scheduling, but without considering any scheduling application in the traffic communication system.…”

Section: Literature Reviewmentioning

confidence: 99%

A novel downlink scheduling strategy for traffic communication system based on TD-LTE technology

et al. 2016

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There are many existing classical scheduling algorithms which can obtain better system throughput and user equality, however, they are not designed for traffic transportation environment, which cannot consider whether the transmission performance of various information flows could meet comprehensive requirements of traffic safety and delay tolerance. This paper proposes a novel downlink scheduling strategy for traffic communication system based on TD-LTE technology, which can perform two classification mappings for various information flows in the eNodeB: firstly, associate every information flow packet with traffic safety importance weight according to its relevance to the traffic safety; secondly, associate every traffic information flow with service type importance weight according to its quality of service (QoS) requirements. Once the connection is established, at every scheduling moment, scheduler would decide the scheduling order of all buffers’ head of line packets periodically according to the instant value of scheduling importance weight function, which calculated by the proposed algorithm. From different scenario simulations, it can be verified that the proposed algorithm can provide superior differentiated transmission service and reliable QoS guarantee to information flows with different traffic safety levels and service types, which is more suitable for traffic transportation environment compared with the existing popularity PF algorithm. With the limited wireless resource, information flow closed related to traffic safety will always obtain priority scheduling right timely, which can help the passengers’ journey more safe. Moreover, the proposed algorithm cannot only obtain good flow throughput and user fairness which are almost equal to those of the PF algorithm without significant differences, but also provide better realtime transmission guarantee to realtime information flow.

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Section: Literature Reviewmentioning

confidence: 99%

A novel downlink scheduling strategy for traffic communication system based on TD-LTE technology

et al. 2016

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“…Subband Allocation: The schemes x i SA correspond to the best configurations found by means of the subband allocation (local search) algorithm proposed in [6]. Note that since this algorithm requires as input the number of subbands for cell edges (K), β , and S TH , a total number of 160 trials 4 were performed in order to find the FFR configurations achieving best results with respect to each performance metric.…”

Section: Bandwidth Proportionalitymentioning

confidence: 99%

“…and LTE-A employ Orthogonal Frequency Division Multiple Access (OFDMA) as access technology for the downlink due to its flexibility for resource allocation [4], and because OFDMA provides intrinsic orthogonality to the users within the same cell, which translates into an almost null level of intracell interference. However, Intercell Interference (ICI) remains as an issue, and indeed, it is the main capacity-limiting factor in OFDMA-based cellular networks, especially when high frequency reuse (to achieve higher spectral efficiency) is intended.…”

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confidence: 99%

Multiobjective optimization of fractional frequency reuse for irregular OFDMA macrocellular deployments

et al. 2015

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Interference mitigation has been identified as a key challenge for emerging cellular technologies based on Orthogonal Frequency Division Multiple Access (OFDMA), such as LTE. In this context, static Intercell Interference Coordination including Fractional Frequency Reuse (FFR) have been adopted by mobile operators as a good alternative to improve the Quality of Service (QoS) at cell edges. Nevertheless, recent results made evident the need for additional research efforts as default FFR configurations only offer tradeoffs in which spectral efficiency is severely penalized. Moreover, the performance of such baseline designs has been showed to be poor in realistic cellular deployments featuring irregular cell patterns. This paper solves this problematic by introducing a novel multiobjective optimization framework based on evolutionary algorithms that jointly takes into account system capacity, cell edge performance, and energy consumption. With respect to important reference schemes, the proposed algorithm succeeds in finding FFR configurations achieving gains between 10% and 40% in terms of system capacity while simultaneously improving cell edge performance up to 70%.

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“…From a system perspective, OFDMA is considered the major transmission and multiple access technology for modern wireless networks such as 3GPP-LTE [14], Mobile WiMAX [15] and also plays a key role in the new paradigm of Cognitive Radio Networking [16]. In particular, LTE-oriented works may be found in [17,18], WiMax-oriented ones in [19,20,21] and cognitive networking related in [22,23] correspondingly.…”

Section: Background and Related Workmentioning

confidence: 99%

Radio resource allocation algorithms for multi-service OFDMA networks: the uniform power loading scenario

et al. 2013

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Adaptive Radio Resource Allocation is essential for guaranteeing high bandwidth and power utilization as well as satisfying heterogeneous Quality-of-Service requests regarding next generation broadband multicarrier wireless access networks like LTE and Mobile WiMAX. A downlink OFDMA single-cell scenario is considered where heterogeneous Constant-Bit-Rate and Best-Effort QoS profiles coexist and the power is uniformly spread over the system bandwidth utilizing a Uniform Power Loading (UPL) scenario. We express this particular QoS provision scenario in mathematical terms, as a variation of the well-known generalized assignment problem answered in the combinatorial optimization field. Based on this concept, we propose two heuristic search algorithms for dynamically allocating subchannels to the competing QoS classes and users which are executed under polynomially-bounded cost. We also propose an Integer Linear Programming model for optimally solving and acquiring a performance upper bound for the same problem at reasonable yet high execution times. Through extensive simulation results we show that the proposed algorithms exhibit high closeto-optimal performance, thus comprising attractive candidates for implementation in modern OFDMA-based systems.Define the following subchannels and users subsets: J CBR = {k ∈ U CBR : lhs k b k } ⊆ U CBR : the subset of CBR users for which minimum QoS is met.J ′ CBR = U CBR \J CBR : the complementary subset of undersatisfied CBR users. J BE = {k ∈ U BE : lhs k > 0} ⊆ U BE : the subset of BE users allocated at least one subchannel or equivalently posses non-zero data rate. J = J CBR ∪ J BE : the subset of users from which we can remove subchannels J ′ = J ′ CBR : the subset of users to which we must add subchannels in order to meet the minimum QoS requirements. N = n ∈ S, k ∈ J : ρ n,k = 1 : the subchannels pool

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Evaluation of OFDMA resource allocation algorithms in broadband wireless access networks

Cited by 8 publications

References 8 publications

A novel downlink scheduling strategy for traffic communication system based on TD-LTE technology

A novel downlink scheduling strategy for traffic communication system based on TD-LTE technology

Multiobjective optimization of fractional frequency reuse for irregular OFDMA macrocellular deployments

Radio resource allocation algorithms for multi-service OFDMA networks: the uniform power loading scenario

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