Abstract
The ultra-reliable and low-latency communication (URLLC) in the fifth generation (5G) communication has emerged many potential applications, which promotes the development of the internet of things (IoTs). In this paper, the URLLC system adopts the duty-cycle muting (DCM) mechanism to share unlicensed spectrums with the WiFi network, which guarantees the fair coexistence. Meanwhile, we use the mini-slot, user grouping, and finite block length regime to satisfy the low latency and high reliability requirements. We establish a non-convex optimization model with respect to power and spectrum, and solve it to minimize the power consumption at the devices, where the closed-form expressions are given by several mathematical derivations and the Lagrangian multiplier method. Numerical simulation results are provided to verify the feasibility and effectiveness of the proposed scheme, which improves the system spectrum efficiency and energy efficiency.
| Original language | English |
|---|---|
| Pages (from-to) | 2232-2243 |
| Journal | Mobile Networks and Applications |
| Volume | 27 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - Dec 2022 |
| MoE publication type | A1 Journal article-refereed |
Funding
This work was supported in part by the National Natural Science Foundation of China (Grant No. 61771429), in part by the Okawa Foundation for Information and Telecommunications, in part by G-7 Scholarship Foundation, in part by the Zhejiang Lab Open Program under Grant 2021LC0AB06, in part by the Academy of Finland under Grant 319759, Zhejiang University City College Scientific Research Foundation (No. JZD18002), in part by ROIS NII Open Collaborative Research 21S0601, and in part by JSPS KAKENHI (Grant No. 18KK0279, 19H04093, 20H00592, and 21H03424).
Keywords
- finite block length regime
- power allocation
- spectrum allocation
- unlicensed band
- URLLC
