URLLC Over Slow Fading Channels: K-Repetition Versus Multi-Connectivity
In this work, we analyze the performance of the uplink ultra-reliable and low-latency communications (URLLC) for the low-mobility users (UEs) in a factory environment. The <inline-formula><tex-math notation="LaTeX">$K$</tex-math></inline-formula>-repetition scheme i...
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2025-01-01
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| Series: | IEEE Open Journal of Vehicular Technology |
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| Online Access: | https://ieeexplore.ieee.org/document/10999067/ |
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| author | Qingjiao Song Fu-Chun Zheng Jingjing Luo |
| author_facet | Qingjiao Song Fu-Chun Zheng Jingjing Luo |
| author_sort | Qingjiao Song |
| collection | DOAJ |
| description | In this work, we analyze the performance of the uplink ultra-reliable and low-latency communications (URLLC) for the low-mobility users (UEs) in a factory environment. The <inline-formula><tex-math notation="LaTeX">$K$</tex-math></inline-formula>-repetition scheme is a promising approach for improving URLLC reliability, but most studies so far have been carried out assuming fast fading. A UE with low mobility typically experiences a time-correlated slow fading channel. We therefore consider the effects of time correlation in analyzing the performance of a <inline-formula><tex-math notation="LaTeX">$K$</tex-math></inline-formula>-repetition scheme. On the other hand, multi-connectivity (MC) schemes can overcome such effects and improve reliability through space diversity. We then apply differential modulation to both schemes to support URLLC services, and compare their performance. The simulation results show that such slow fading channels severely decreases the time diversity of a <inline-formula><tex-math notation="LaTeX">$K$</tex-math></inline-formula>-repetition scheme, and the MC scheme outperforms the <inline-formula><tex-math notation="LaTeX">$K$</tex-math></inline-formula>-repetition scheme in terms of reliability and transmission latency. |
| format | Article |
| id | doaj-art-74dc0ef3c7574068b9be91d6d488e9a3 |
| institution | DOAJ |
| issn | 2644-1330 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Open Journal of Vehicular Technology |
| spelling | doaj-art-74dc0ef3c7574068b9be91d6d488e9a32025-08-20T03:19:34ZengIEEEIEEE Open Journal of Vehicular Technology2644-13302025-01-0161280128610.1109/OJVT.2025.356918710999067URLLC Over Slow Fading Channels: K-Repetition Versus Multi-ConnectivityQingjiao Song0https://orcid.org/0009-0005-9807-9777Fu-Chun Zheng1https://orcid.org/0000-0003-3184-3054Jingjing Luo2https://orcid.org/0000-0002-2864-6562School of Electronic and Information Engineering, Harbin Institute of Technology, Shenzhen, ChinaSchool of Electronic and Information Engineering, Harbin Institute of Technology, Shenzhen, ChinaSchool of Electronic and Information Engineering, Harbin Institute of Technology, Shenzhen, ChinaIn this work, we analyze the performance of the uplink ultra-reliable and low-latency communications (URLLC) for the low-mobility users (UEs) in a factory environment. The <inline-formula><tex-math notation="LaTeX">$K$</tex-math></inline-formula>-repetition scheme is a promising approach for improving URLLC reliability, but most studies so far have been carried out assuming fast fading. A UE with low mobility typically experiences a time-correlated slow fading channel. We therefore consider the effects of time correlation in analyzing the performance of a <inline-formula><tex-math notation="LaTeX">$K$</tex-math></inline-formula>-repetition scheme. On the other hand, multi-connectivity (MC) schemes can overcome such effects and improve reliability through space diversity. We then apply differential modulation to both schemes to support URLLC services, and compare their performance. The simulation results show that such slow fading channels severely decreases the time diversity of a <inline-formula><tex-math notation="LaTeX">$K$</tex-math></inline-formula>-repetition scheme, and the MC scheme outperforms the <inline-formula><tex-math notation="LaTeX">$K$</tex-math></inline-formula>-repetition scheme in terms of reliability and transmission latency.https://ieeexplore.ieee.org/document/10999067/URLLCtime correlation<inline-formula xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <tex-math notation="LaTeX">$K$</tex-math> </inline-formula>-repetitionmulti-connectivitydifferential modulation |
| spellingShingle | Qingjiao Song Fu-Chun Zheng Jingjing Luo URLLC Over Slow Fading Channels: K-Repetition Versus Multi-Connectivity IEEE Open Journal of Vehicular Technology URLLC time correlation <inline-formula xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <tex-math notation="LaTeX">$K$</tex-math> </inline-formula>-repetition multi-connectivity differential modulation |
| title | URLLC Over Slow Fading Channels: K-Repetition Versus Multi-Connectivity |
| title_full | URLLC Over Slow Fading Channels: K-Repetition Versus Multi-Connectivity |
| title_fullStr | URLLC Over Slow Fading Channels: K-Repetition Versus Multi-Connectivity |
| title_full_unstemmed | URLLC Over Slow Fading Channels: K-Repetition Versus Multi-Connectivity |
| title_short | URLLC Over Slow Fading Channels: K-Repetition Versus Multi-Connectivity |
| title_sort | urllc over slow fading channels k repetition versus multi connectivity |
| topic | URLLC time correlation <inline-formula xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <tex-math notation="LaTeX">$K$</tex-math> </inline-formula>-repetition multi-connectivity differential modulation |
| url | https://ieeexplore.ieee.org/document/10999067/ |
| work_keys_str_mv | AT qingjiaosong urllcoverslowfadingchannelskrepetitionversusmulticonnectivity AT fuchunzheng urllcoverslowfadingchannelskrepetitionversusmulticonnectivity AT jingjingluo urllcoverslowfadingchannelskrepetitionversusmulticonnectivity |