A Cooperation Scheme for User Fairness and Performance Enhancement in NOMA-HCN

Swami, Pragya; Bhatia, Vimal; Vuppala, Satyanarayana; Ratnarajah, Tharmalingam

doi:10.1109/tvt.2018.2877619

Cited by 30 publications

(16 citation statements)

References 32 publications

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“…the data rates due to small coverage areas. NOMA integrated with such HetNets has been extensively studied in the literature as in [26], [27]. Furthermore, heterogeneous UDNs require that the deployment of the MBSs and the DRAFT SBSs follow the rule set as per the UDN network demands, i.e., number of base stations needs to be larger than the number of users, as shown in Fig.1 network densification improves the capacity, however, there exists a limit posed due to the aggregate interference cause by the interfering base stations.…”

Section: Noma and Its Application To Three Main Use-cases Of 5gmentioning

confidence: 99%

Non-orthogonal Multiple Access: An Enabler for Massive Connectivity

et al. 2020

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Two of the most challenging goals to be achieved in the fifth generation (5G) and beyond communication are massive connectivity and higher capacity. The use of traditional orthogonal multiple access techniques limits the number of users that can be served using the available resources due to orthogonality constraint. Moreover, the available resources may not be utilized effectively by the alloted users thereby resulting in inefficiency and user unfairness. This imposes a severe drawback in cases where the number of users to be served are high, like in the 5G networks. Hence, introducing non-orthogonality to the multiple access scheme is advocated as a supreme methodology to serve multiple users simultaneously, thereby enhancing the connectivity. In scenarios with massive number of users, non-orthogonal multiple access scheme increases the number of active connections by superimposing the signal of multi-users on a same resource block, thereby also utilizing the available resources efficiently.

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Section: Noma and Its Application To Three Main Use-cases Of 5gmentioning

confidence: 99%

Non-orthogonal Multiple Access: An Enabler for Massive Connectivity

et al. 2020

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“…The transmit power and communication range are denoted by P T and Y T , respectively, for the BS of T th tier. The target data rate is denoted as R. For UHF band, bounded path loss model is considered [3], [13]. The mmWave channel model is expressed as follows [7]…”

Section: Proposed System Model For Noma Enabled Hybrid Uhf/mmwavementioning

confidence: 99%

“…where L is the number of multi-paths, and a(θ) = 1 √ M 1 e −jπθ · · · e −jπ(M −1)θ T . The distance between the typical user (TU) and the nearest BS of the T th tier is denoted by r T t , such that T = {b, u, m}, owing to the nearest neighbor (NN) connection policy [1], [3]. The ν N LOS and ν LOS denote the path loss exponents for the non-line-of-sight (NLOS) and line-of-sight (LOS) paths, respectively.…”

Section: Proposed System Model For Noma Enabled Hybrid Uhf/mmwavementioning

confidence: 99%

“…So far, the concept of biased received power (BRP) for association has been used for offloading between the tiers only (i.e., tier selection) [3], [12]. The proposed work considers BRP for tier selection and also for RAT selection using a two-step association procedure which lowers the initial access delay for the mSBS tier.…”

Section: B Two-step Association Proceduresmentioning

confidence: 99%

“…If the position of ultra high frequency (UHF) SBS and mmWave-SBS (mSBS) relative to one another are known in a multi-radio access technology (RAT) Proposing a future cellular network with the co-existence of multiple-RATs is a more practical approach [2]. Moreover, due to the increased load on the macro base station (MBS) tier due to rapidly increasing number of users, offloading the users to the SBS aids in load balancing in a HetNet [3]. At the SBS tier, it might not be possible to dedicate an entire frequency band to the offloaded user (OU) due to resource constraints.…”

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of NOMA Enabled Hybrid Network With Limited Feedback

Swami

Mishra²,

Bhatia

et al. 2020

IEEE Trans. Veh. Technol.

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This paper investigates the coexistence of multi radio access technology (RAT) using Ultra High Frequency (UHF) small base station (SBS) and millimeter Wave (mmWave) SBS tier in a heterogeneous network (HetNet). To support large number of users, non-orthogonal multiple access (NOMA) is used in the SBS tier. For NOMA, the SBS needs to obtain users' channel state information (CSI) to determine their ordering. Acquiring CSI at the SBS is a challenging task due to the massively increased number of users. The existing literature uses limited feedback from the users as a potential solution to assist the SBS in user ordering, when perfect CSI is not known at the base station. The limited feedback from the users in the existing literature is used only for user ordering. However, in the proposed work, unlike using limited feedback only for user ordering, the usage of limited feedback from the users is twofold. The first one is for the user ordering and the second is for the RAT selection. The impact of the proposed feedback system is analyzed in a NOMA enabled hybrid UHF/mmWave downlink HetNet. Numerical results show that the proposed feedback system achieves significant improvement in the outage probability.Index Terms-Non-orthogonal multiple access, mmWave, heterogeneous network, limited feedback, outage probability.

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NOMA for 5G and Beyond Wireless Networks

Swami

Bhatia²

2022

Signals and Communication Technology

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A Cooperation Scheme for User Fairness and Performance Enhancement in NOMA-HCN

Cited by 30 publications

References 32 publications

Non-orthogonal Multiple Access: An Enabler for Massive Connectivity

Non-orthogonal Multiple Access: An Enabler for Massive Connectivity

Performance Analysis of NOMA Enabled Hybrid Network With Limited Feedback

NOMA for 5G and Beyond Wireless Networks

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