NOMA Aided Narrowband IoT for Machine Type Communications with User Clustering
| Autor: | Nirwan Ansari, Ali Shahini |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
FOS: Computer and information sciences
Optimization problem Computer Networks and Communications Computer science Throughput 02 engineering and technology NarrowBand IOT Noma Computer Science - Networking and Internet Architecture 0203 mechanical engineering Telecommunications link 0202 electrical engineering electronic engineering information engineering medicine Resource management Cluster analysis Next Generation Mobile Networks Networking and Internet Architecture (cs.NI) Wireless network business.industry Quality of service 020206 networking & telecommunications 020302 automobile design & engineering medicine.disease Computer Science Applications Hardware and Architecture Signal Processing Resource allocation business Information Systems Power control Computer network |
| Popis: | To support Machine Type Communications (MTC) in next generation mobile networks, NarrowBand-IoT (NB-IoT) has been released by the Third Generation Partnership Project (3GPP) as a promising solution to provide extended coverage and low energy consumption for low cost MTC devices. However, the existing Orthogonal Multiple Access (OMA) scheme in NB-IoT cannot provide connectivity for a massive number of MTC devices. In parallel with the development of NB-IoT, Non-Orthogonal Multiple Access (NOMA), introduced for the fifth generation wireless networks, is deemed to significantly improve the network capacity by providing massive connectivity through sharing the same spectral resources. To leverage NOMA in the context of NB-IoT, we propose a power domain NOMA scheme with user clustering for an NB-IoT system. In particular, the MTC devices are assigned to different ranks within the NOMA clusters where they transmit over the same frequency resources. Then, we formulate an optimization problem to maximize the total throughput of the network by optimizing the resource allocation of MTC devices and NOMA clustering while satisfying the transmission power and quality of service requirements. We prove the NP-hardness of the proposed optimization problem. We further design an efficient heuristic algorithm to solve the proposed optimization problem by jointly optimizing NOMA clustering and resource allocation of MTC devices. Furthermore, we prove that the reduced optimization problem of power control is a convex optimization task. Simulation results are presented to demonstrate the efficiency of the proposed scheme. |
| Databáze: | OpenAIRE |
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