Random Access Preamble and Data Transmission for 5G IoT
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Solution Overview
Problem
The increasing number of IoT and M2M devices in 5G networks leads to PRACH overload and unacceptable connection latencies due to collisions during random access, which existing strategies fail to adequately address, especially in the MAC layer.
Innovation Solution
The proposed solution involves an apparatus and method for simultaneous random access in a wireless communication system using angle of arrival information, where a terminal transmits a preamble and data simultaneously to a base station, and the base station responds with multiple messages, allowing for efficient decoding and resource allocation, even in cases of preamble collisions, using MIMO technology and a collision-avoiding algorithm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of IoT and M2M devices is increased to meet demand, then network coverage and service capability are improved, but random access collisions increase and connection latency becomes unacceptable
Solution Approach 1:
The patent segments the random access process into two distinct stages: a contention-based random access stage and a contention-free scheduled access stage. This segmentation allows devices to first acquire initial access through contention-based methods, then transition to collision-free scheduled access for data transmission, thereby resolving the latency issue caused by repeated contention collisions while supporting massive device connections
Solution Approach 2:
The patent introduces a new dimension of control by implementing a scheduled random access mechanism where the base station allocates dedicated time-frequency resources and provides advance scheduling information to devices. This dimensional addition transforms the traditional single-stage contention-based access into a multi-dimensional access framework that eliminates collisions for scheduled devices
2Adaptability or versatility
If traditional contention-based random access is used, then device access is simple and flexible, but access capacity is limited and collisions cause excessive latency
Solution Approach 1:
The patent creates a universal access framework that supports both contention-based random access and contention-free scheduled access within the same system. This multi-functionality allows the network to dynamically select the appropriate access mode based on device type, traffic characteristics, and network conditions, thereby increasing overall access capacity while maintaining the flexibility of traditional methods for devices that require it
Data Source
AI summary
A 5th Generation (5G) or pre-5G communication system for supporting a higher data rate than a 4G communication system such as Long Term Evolution (LTE) is provided. A method of a terminal for operating a random access in a wireless communication system may include transmitting, to a base station, a first message comprising a random access preamble, and receiving a plurality of second messages transmitted from the base station in response to the first message. A method of a base station for operating a random access in a wireless communication system may include receiving, from a terminal, a first message comprising a random access preamble, and transmitting, to the terminal, a plurality of second messages in response to the first message.