Systems Engineering and Electronics ›› 2025, Vol. 47 ›› Issue (12): 4203-4211.doi: 10.12305/j.issn.1001-506X.2025.12.32

• Communications and Networks • Previous Articles    

Robust transmission method for IRS assisted satellite-terrestrial fusion considering queue stability

Xincheng HE1(), Bai ZHAO1, Zhi LIN2, Zining WANG1, Jian OUYANG1,*   

  1. 1. College of Communications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China
    2. Anhui Province Key Laboratory of Electronic Restriction,National University of Defense Technology,Hefei 230037,China
  • Received:2024-08-02 Revised:2025-02-03 Online:2025-04-22 Published:2025-04-22
  • Contact: Jian OUYANG E-mail:hexincheng20000116@163.com

Abstract:

Intelligent reflecting surfaces (IRS), composed of electromagnetic metamaterials, offer advantages such as enhanced signal quality and reduced communication energy consumption, making them a widely researched topic in the field of wireless communications. For scenarios where satellite and terrestrial networks share spectrum resources, an IRS-assisted robust downlink transmission scheme for satellite-terrestrial integrated networks that satisfies queue stability is proposed. In this scheme, the satellite system uses multicast technology to serve multiple users with the assistance of IRS, while the base station employs space division multiple access to serve multiple terrestrial users. Assuming only imperfect channel state information of the users is available, a long-timescale optimization problem with the goal of minimizing the time-averaged total transmission power is established, subject to queue transmission stability and quality of service constraints for all users. Utilize the Lyapunov optimization technique to convert the long-term optimization problem into a single-time-slot optimization problem. Furthermore, we address the non-convex constraints that include channel errors through an effective combination of the S-procedure and the successive convex approximation method to obtain the optimal solutions to the optimization problem, achieving robust wireless transmission in the satellite-terrestrial integrated network under queue stability conditions. Finally, computer simulation results demonstrate that the proposed scheme provides better queue stability and lower system energy consumption compared to existing schemes.

Key words: satellite-terrestrial integrated network (STIN), intelligent reflecting surface (IRS), queue transmission, imperfect channel state information, Lyapunov optimization

CLC Number: 

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