A packet-based random access and data transmission method in large-scale mtc network

Abstract

Disclosed are a grouping-based random access and data transmission method in a large-scale MTC network. In an mMTC network, data transmission resources are divided into link 1 and link 2; an MTCD sends, by means of link 1, a data packet to a gateway; the gateway receives the data packet according to a cache margin; the gateway, the cache of which reaches a threshold value, uses a contention-based four-step handshake process to compete for access to a base station; and the gateway successfully accessing the base station transmits, on an allocated uplink channel and by means of link 2, an aggregated data packet to the base station at a higher rate. The number of gateways for initiating access requests is derived when a system is in a steady state, and an expression of the throughput of the system is obtained by means of analysis. A throughput optimization problem is constructed by means of taking the maximum throughput as a target and combining constraint conditions, such as a resource allocation ratio and a gateway forwarding threshold value, and an optimal resource allocation ratio and an optimal gateway forwarding threshold value are solved by means of a differential evolution algorithm. The present invention effectively improves the throughput of a system, and reduces access delays.

Description

technical field [0001] The invention belongs to the random access and data transmission technology in the large-scale MTC network, and specifically relates to the realization of a packet-based random access and data transmission scheme in the large-scale MTC network. Background technique [0002] As a key link in the era of intelligence, the Internet of Things has gradually penetrated into various fields of society. The number of machine-type communication devices (MTCD) is also increasing. Large-scale machine-type communication (massive machine-type communication, mMTC) has become one of the main communication scenarios of 5G. To facilitate widespread implementation of machine type communications, mMTC is primarily deployed in cellular networks. However, the traditional cellular network is designed for H2H, and mMTC will cause a series of problems due to its own characteristics: First, the number of MTCDs is huge, while the number of preambles used for access is small, and...

AI Technical Summary

Problems solved by technology

However, the traditional cellular network is designed for H2H, and mMTC will cause a series of problems due to its own characteristics: First, the number of MTCDs is huge, while the number of preambles used for access is small, and a large number of MTCDs initiate to the base station in a short period of time. Access requests will cause more access collisions, which will lead to severe network congestion, making it impossible for a large number of devices to transmit data in time; secondly, the total amount of communication data in mMTC is large but the data packets of a single device are small. The four-step handshake process will cause a large signaling overhead; finally, the transmission rate of most MTCDs is small, and the wireless resources are limited. The direct transmission of data from MTCD to the base station will greatly reduce resource utilization, and the transmission rate of MTCD itself is not applicable. Based on the high-speed transmission characteristics of 5G

Some studies have introduced the concept of gateway forwarding threshold, and have shown the impact of gateway forwarding threshold on system performance through programming simulations, but have not further substituted the concept of gateway forwarding threshold into theoretical analysis, conducted analytical derivation, and theoretically analyzed gateway forwarding Impact of Thresholds on System Performance

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