An access control method and system in a scenario where urllc and mmtc coexist

Abstract

The embodiment of the invention provides an access control method and system under the coexistence scenes of URLLC and mMTC. The method is characterized in that for each subcarrier on the bandwidth ofan Internet of Things system, based on an uplink non-orthogonal multiple access (NOMA) mechanism, a plurality of URLLC devices and a plurality of mMTC devices are simultaneously accessed according toa preset power allocation algorithm. According to the access control method under the coexistence scene of the URLLC and the MMTC, by using an NOMA technology and according to a preset power allocation rule, the multiple URLLC devices and the multiple mMTC devices share the same subcarriers, and therefore the Internet of Things system can support higher connection density, and the spectrum efficiency can be improved.

Description

technical field [0001] Embodiments of the present invention relate to the field of communication technologies, and in particular to an access control method and system in a scenario where URLLC and mMTC coexist. Background technique [0002] Machine-to-machine communication (MTC) is an important part of the Internet of Things (IoT), enabling communication from an MTC device to a central MTC server or a group of MTC servers. MTC devices (MTCDs) have extremely broad application prospects, such as wireless detection and sensing devices, wireless control systems for factory equipment, and intelligent transportation systems. The International Telecommunication Union (ITU) divides MTC into two categories: massive MTC (mMTC) and ultra-reliable and low-latency communications (URLLC). Among them, mMTC devices have a high connection density, and a large number of low-cost and low-power MTCD devices, such as wireless sensor systems, will coexist in each cell. These devices transmit s...

AI Technical Summary

Problems solved by technology

In the case of using OFDMA, only one MTCD device is allowed to use each subcarrier, so it may not be able to cope well with the situation where a large number of MTCD devices request links in the LTE-A Pro network

When there are a large number of devices, many devices cannot upload data to the base station in time due to lack of allocation of subcarriers, especially for URLLC, which has high requirements on speed and delay, which greatly affects user experience.

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