STAR-RIS Assisted Offloading Based on Hybrid NOMA: A Time Minimization Perspective

被引:3
作者
Li, Na [1 ,2 ]
Chen, Bingchang [1 ]
Tao, Xiaofeng [1 ,2 ]
机构
[1] Beijing Univ Posts & Telecommun, Natl Engn Res Ctr Mobile Network Technol, Beijing 100876, Peoples R China
[2] Beijing Univ Posts & Telecommun, Shenzhen Res Inst, Shenzhen 518063, Peoples R China
基金
北京市自然科学基金;
关键词
Hybrid NOMA; multi-access edge computing; STAR-RIS; wireless offloading; RESOURCE-ALLOCATION; MEC; NETWORKS; COMMUNICATION; SURFACES; DESIGN;
D O I
10.1109/TVT.2024.3382307
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The simultaneous transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) has emerged as a novel concept and promising technology for future wireless networks. In this article, we propose a STAR-RIS assisted multi-access edge computing (MEC) framework, where the user offloads the tasks to multiple edge nodes, and the STAR-RIS is deployed to enable and enhance the multiple offloading links at the same time. Meanwhile, the hybrid non-orthogonal multiple access (h-NOMA) is adopted to further improve the performance of the STAR-RIS assisted downlink parallel offloading. We aim to minimize the latency by jointly optimizing the offloading order and task division to the edge nodes, the time allocation for the time-division multiple access (TDMA) transmission and the NOMA transmission in the h-NOMA scheme, the transmit power and the decoding orders when employing NOMA, and the transmitting and reflecting coefficients at the STAR-RIS. To solve this highly complex optimization problem, we first derive the optimal solutions of the time allocation and task division in closed forms, and then propose a low-complexity alternative optimizing (AO) algorithm based on successive convex approximation (SCA) technique to optimize the allocation of radio resources. Simulation results show that the proposed STAR-RIS assisted offloading scheme based on h-NOMA can effectively reduce the time latency compared with benchmark schemes, especially when the number of the STAR-RIS elements is small.
引用
收藏
页码:11719 / 11734
页数:16
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