# A Fuzzy-Logic-Based Load Balancing Scheme for a Satellite-Terrestrial Integrated Network
## 5 Conclusions  
Existing studies on load balancing in STIN only considered a single metric of signal reception. When users move and require data randomly, the baseline schemes may not have acceptable performance in the long term. Active load balancing methods could obtain performance gains compared with the existing reactive methods. Considering the randomness of users in the future and the difficulty of explicitly evaluating overload tendency, we proposed an overload tendency evaluation metric based on fuzzy logic. Then, the overloading problem in STIN was solved by the proposed FL-LB: An access algorithm for all users called FLRL-AC was proposed, which prevents overloading while considering the characteristics of NTN. An offloading algorithm for the already overloaded cells called FL-OL was proposed, which balances load between cells. The fuzzy logic network is trained by ANFN, and the neural network in FLRL-AC is trained by FDDPG. Results show that FL-LB reduces the possibility of overloading before it occurs and makes cells maintain a longer load balance after offloading to ensure QoS for users. Conceptualization, Y.G. and H.Y. ; methodology, Y.G. and H.Y. ; software, H.Y. and X.W. ; validation, Y.C. and C.L. ; formal analysis, Y.G. ; investigation, H.Y., X.W., Y.C. and C.L. ; resources, X.Z. and Y  
* [PERSON] et al. (2019) [PERSON]; [PERSON]; [PERSON]; [PERSON] 6G Wireless Communications: Vision and Potential Techniques. _IEEE Netw._**2019**, _33_, 70-75. [CrossRef]
* [PERSON] et al. (2018) [PERSON]; [PERSON]; [PERSON] Mobility Load-Balancing Method for Self-Organizing Wireless Networks Inspired by Synchronization and Matching with Preferences. _IEEE Trans. Veh. Technol._**2018**, \(6\), 2594-2606. [CrossRef]
* [PERSON] (2022) [PERSON] Load Balancing Call Admission Control Algorithm (CACA) Based on Soft-Handover in 5G Networks. In Proceedings of the 2022 IEEE 12 th Annual Computing and Communication Workshop and Conference (CCWC), Las Vegas, NV, USA, 26-29 January 2022. * [PERSON] et al. (2021) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] A Multi-Attribute Decision Handover Strategy for Giant LEO Mobile Satellite Networks. In Proceedings of the 6 th International Conference on Smart Computing and Communication (SmartCom), Online, 29-31 December 2021. * [PERSON] et al. (2021) [PERSON]; [PERSON]; [PERSON]; [PERSON] Fuzzy-Logic-Based Handover Algorithm for 5G Networks. In Proceedings of the 2021 IEEE Wireless Communications and Networking Conference (WCNC), Nanjing, China, 29 March-1 April 2021. * [PERSON] et al. (2021) [PERSON]; [PERSON]; [PERSON] Reinforcement Learning Based Mobility Load Balancing with the Cell Individual Offset. In Proceedings of the 2021 IEEE 93 rd Vehicular Technology Conference (VTC2021-Spring), Helsinki, Finland, 25-28 April 2021. * [PERSON] et al. (2020) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Design and Simulation of the Multi-RAT Load-balancing Algorithms for 5G-ALSTAR Systems. In Proceedings of the 2020 International Conference on Information and Communication Technology Convergence (ICTC), Jeju, Korea, 21-23 October 2020. * [PERSON] et al. (2018) [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON] Coverage Analysis and Load Balancing in HetNets With Millimeter Wave Multi-RAT Small Cells. _IEEE Trans. Wirel. Commun._**2018**, _17_, 3154-3169. [CrossRef]
* [PERSON] et al. (2020) [PERSON]; [PERSON]; [PERSON]; [PERSON] [PERSON] Handover-based Load Balancing Algorithm for 5G and Beyond Heterogeneous Networks. In Proceedings of the 2020 12 th International Congress on Ultra Modern Telecommunications and Control Systems and Workshops (ICUMT), Brno, Czech Republic, 5-7 October 2020. * [PERSON] et al. (2022) [PERSON]; [PERSON]; [PERSON] Reduced Complexity Optimal Resource Allocation for Enhanced Video Quality in a Heterogeneous Network Environment. _IEEE Trans. Wirel. Commun._**2022**, _17_, 2892-2908. [CrossRef]
* [PERSON] et al. (2022) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Overview of Prospects for Service-Aware Radio Access towards 6G Networks.