In order to satisfy the increasingly massive connection in mMTC system, multiple access technology is a key enabler in the future 6G mMTC. Recently, an emerging multiple access scheme named resource hopping based multiple access (RHMA) has been proposed to achieve reliable user identification and data detection in grant-free random access for mMTC. However, the collision resolution of RHMA is still limited for the future 6G mMTC requirements. Therefore, an improved design is proposed in this paper to enhance the collision resolution capability of RHMA. Specifically, successive interference cancellation (SIC) is combined with user identification and segment decoding at the receiver of RHMA. Also, the user identification of RHMA is improved to eliminate the false alarm user caused by collision and blind channel estimation is considered to recover the signal on the colliding segments. The simulation results show that the improved design is able to achieve a higher collision resolution capability of RHMA.
Improved Design of Resource Hopping Based Multiple Access for Grant-Free Random Access in 6G mMTC System
2024-06-24
783647 byte
Conference paper
Electronic Resource
English
A Random Non-Orthogonal Multiple Access Scheme for mMTC
IEEE | 2017
|Improving Random Access with NOMA in mMTC XL-MIMO
IEEE | 2023
|