Two-Step Random Access Signaling Overhead Reduction
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Solution Overview
Problem
The traditional four-step random access procedure in cellular systems has a high signaling overhead, and the two-step random access procedure lacks a clear method for data transmission.
Innovation Solution
A method for random access that involves a terminal device transmitting a first preamble and first uplink data to a network device, with the network device providing scheduling information based on the reception situation of the uplink data, allowing the terminal device to perform subsequent transmissions accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a four-step random access procedure is used, then the random access function is established, but the signaling overhead is high
Solution Approach 1:
The patent combines the random access preamble transmission and uplink data transmission into a single step (Message A), and combines the random access response and uplink grant into a single message (Message B). This merging reduces the number of signaling exchanges from four steps to two steps, thereby reducing signaling overhead while maintaining the random access function.
Solution Approach 2:
The patent designs Message A to serve multiple functions: it acts as both a random access preamble and carries uplink data simultaneously. Similarly, Message B serves as both a random access response and an uplink grant. This multi-functionality reduces the need for separate signaling messages, thereby reducing overall signaling overhead.
2Quantity of substance
If a two-step random access procedure is used, then the signaling overhead is reduced, but the data transmission method is unclear
Solution Approach 1:
The patent introduces dynamic scheduling information in Message B that adapts to different reception scenarios. The network device can dynamically adjust the uplink grant parameters based on whether Message A was received correctly, enabling flexible data transmission while maintaining the simplified two-step structure.
Solution Approach 2:
The patent implements a feedback mechanism where the network device provides scheduling information in Message B based on the reception status of Message A. This feedback enables the terminal device to adjust its data transmission accordingly, making the data transmission method clear and adaptable while maintaining low signaling overhead.
3Adaptability or versatility
If scheduling information is provided based on reception situation, then transmission flexibility is improved, but system complexity increases
Solution Approach 1:
The patent segments the scheduling information into different types based on reception scenarios (e.g., successful reception, partial reception, failed reception). Each segment contains appropriate parameters for that specific scenario, allowing flexible transmission without requiring the system to handle all possible scenarios with complex logic.
Solution Approach 2:
The patent uses lightweight scheduling information structures that are simple to parse and execute. The scheduling information is designed to be processed quickly and discarded after use, reducing the computational burden and system complexity while maintaining transmission flexibility.
Data Source
AI summary
The embodiments of the present disclosure provide a random access method and device, and provide a method for data transmission for a terminal device that performs random access using a two-step random access procedure. The method includes: transmitting, by a terminal device, a first preamble and first uplink data to a network device; receiving, by the terminal device, scheduling information transmitted by the network device; and performing, by the terminal device, a subsequent transmission according to the scheduling information.