Enhancing smart city IoT communication: A two-layer NOMA-based network with caching mechanisms and optimized resource allocation

IF 4.4 2区 计算机科学 Q1 COMPUTER SCIENCE, HARDWARE & ARCHITECTURE
Tareq M. Alkhaldi , Abdulbasit A. Darem , Asma A. Alhashmi , Tawfik Al-Hadhrami , Azza Elneil Osman
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引用次数: 0

Abstract

With advancements in next-generation communication systems, large-scale Internet of Things device (IoTDs) deployments in smart cities face challenges like limited bandwidth, high latency, and network congestion. To address this, we propose a two-layer network architecture utilizing non-orthogonal multiple access (NOMA) and caching to enhance IoT communications’ performance, efficiency, and reliability. Our primary objective is to optimize resource allocation and solve the association problem in a two-layer network. We formulated a joint optimization problem to maximize system utility through device association, power, and bandwidth allocation, considering constraints like channel quality and interference. We decoupled the non-linear, non-convex problem using block coordinate descent (BCD) and inner approximation techniques to maximize the aggregated data rate in high-density IoT scenarios. This approach reduced computational complexity while proving the scheme’s theoretical and numerical convergence. To evaluate the proposed scheme, we compared its performance with an ideal backhauling approach, an exhaustive search (upper bound), and a Genetic algorithm-based heuristic. Our scheme outperformed the others, achieving 98.04% of the ideal backhauling and 99.60% of the upper bound. Statistical analysis confirmed its robustness and consistent performance across various conditions. The two-layer NOMA-based network with caching and optimized resource allocation significantly enhances IoT communication efficiency and resilience, offering a solid framework for future smart city deployments.
增强智慧城市物联网通信:具有缓存机制和优化资源分配的基于 NOMA 的双层网络
随着下一代通信系统的发展,智慧城市中大规模的物联网设备(IoTDs)部署面临着带宽有限、高延迟和网络拥塞等挑战。为此,我们提出了一种利用非正交多址接入(NOMA)和缓存的双层网络架构,以提高物联网通信的性能、效率和可靠性。我们的主要目标是优化资源分配,解决双层网络中的关联问题。考虑到信道质量和干扰等约束条件,我们提出了一个联合优化问题,通过设备关联、功率和带宽分配实现系统效用最大化。我们利用块坐标下降(BCD)和内近似技术解耦了非线性、非凸问题,以最大化高密度物联网场景中的聚合数据速率。这种方法降低了计算复杂度,同时证明了方案的理论和数值收敛性。为了评估所提出的方案,我们将其性能与理想的回程方法、穷举搜索(上限)和基于遗传算法的启发式进行了比较。我们的方案优于其他方案,实现了 98.04% 的理想回程和 99.60% 的上限。统计分析证实了该方案在各种条件下的稳健性和一致性能。基于 NOMA 的双层网络具有缓存和优化的资源分配功能,大大提高了物联网通信效率和弹性,为未来的智慧城市部署提供了一个坚实的框架。
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来源期刊
Computer Networks
Computer Networks 工程技术-电信学
CiteScore
10.80
自引率
3.60%
发文量
434
审稿时长
8.6 months
期刊介绍: Computer Networks is an international, archival journal providing a publication vehicle for complete coverage of all topics of interest to those involved in the computer communications networking area. The audience includes researchers, managers and operators of networks as well as designers and implementors. The Editorial Board will consider any material for publication that is of interest to those groups.
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