Dynamic energy detection threshold and priority-coupled adaptive LTT mechanism in unlicensed spectrum
Zongnan Li, Jing Zhou, Yunliang Zhu, Shuo Jia, Jiantao Yuan · 2025
This paper proposes an adaptive Listen-Think-Talk (LTT) channel access mechanism tailed for unlicensed spectrum. The LTT mechanism reconstructs the traditional listen before talk (LBT) into a three-layer architecture by incorporating a novel “Think” layer. It encompasses a dynamic Energy Detection Threshold (EDT) algorithm driven by service priorities and a cross-layer collaborative function. The dynamic Energy Detection Threshold (EDT) in the LTT mechanism adjusts based on priority weights and channel states, allowing high-priority services quick channel access. Its cross-layer component improves heterogeneous protocol coexistence. Results demonstrate that the LTT mechanism outperforms baseline schemes. It significantly improves spectrum efficiency, reduces the collision probability, and decreases the Ultra-Reliable and Low-Latency Communication (URLLC) service latency. Moreover, it exhibits remarkable adaptability to diverse network conditions. In summary, the LTT mechanism offers a reliable and efficient solution for communication in unlicensed spectrum, thereby presenting promising application prospects in future wireless communication scenarios.