Abstract
For Beyond 5G/6G system, satellite communication systems become an effective component of the space and terrestrial integrated network. Among typical applications, massive Machine Type of Communication (mMTC) is a promising and challenging application. The demands of low power consumption and light signaling make random access methods as the potential solution. Up to now, contention resolution-based ALOHA methods, such as contention resolution diversity slotted ALOHA (CRDSA), improve the throughput significantly. However, its throughput will meet the inflection point soon with the normalized load increasing since collisionless packets are hardly existing. In fact, the diversity of transmitting packets is not utilized totally. In this paper, an improved random access method, named coherent CRDSA method (C-CRDSA), is proposed. It accumulates replicated packets coherently at receiver and further improve the throughput over CRDSA. Detailed derivations and simulations are given. Simulation results corroborate the effectiveness of the proposed method.
Highlights
Space and terrestrial integrated network can provide seamless and tridimensional information services for the whole planet (Liu et al, 2018)
C-contention resolution diversity slotted ALOHA (CRDSA) improve the performance of the scheme using coherent accumulation to separate collision packets alone in low load areas, which can be found in Figures 8, 9
Random access is a potential choice of multiple access scheme in the satellite Internet of Things (IoT) system
Summary
Space and terrestrial integrated network can provide seamless and tridimensional information services for the whole planet (Liu et al, 2018). Since each terminal randomly selects the transmitting interval, the data packet of FIGURE 7 | Use iterative interference cancellation technology to eliminate collision data packets on the received data frame (A) Virtual subframe with free replica. On the data frame where the signal is separated through coherent accumulation, the iterative interference cancellation technology and the data packets on the clean time slot are used to eliminate the collided data packets. C-CRDSA improve the performance of the scheme using coherent accumulation to separate collision packets alone in low load areas, which can be found in Figures 8, 9.
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