On-Demand System Information Transmission via Random Access Mapping
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Solution Overview
Problem
In LTE systems, the periodic transmission of system information leads to redundant transmissions, wasting resources, as terminals may have already acquired the necessary information, and there is no optimal method for distinguishing between essential and non-essential system information in 5G NR systems.
Innovation Solution
A method where a base station determines the access purpose of a terminal based on a preset mapping relationship between a physical random access channel resource and the terminal's access purpose, allowing for targeted transmission of system information only when requested, using MSG1 and MSG2 messages to convey the necessary information without redundant signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If system information is transmitted periodically to all terminals, then all terminals can receive the system information, but redundant transmissions occur wasting resources
Solution Approach 1:
The patent transforms the static periodic transmission mode into a dynamic on-demand transmission mode. The base station dynamically adjusts transmission timing based on terminal requests, using random access channel resources to trigger system information transmission only when needed, thereby eliminating redundant transmissions while ensuring all terminals can receive information when required.
Solution Approach 2:
The patent enables terminals to self-initiate system information requests by selecting appropriate random access channel resources based on their needs. Terminals autonomously determine when to request system information and select corresponding uplink resources, making the system information transmission service self-triggered rather than blindly periodic, thus reducing waste while maintaining reliability.
2Loss of information
If system information is transmitted periodically, then terminals can always have the latest information, but transmission occurs even when terminals already have or do not need the information
Solution Approach 1:
The patent introduces a feedback mechanism where terminals indicate their information needs through random access channel selections. The base station receives this feedback and adjusts transmission accordingly, creating a closed-loop system that transmits information only when terminals actually need updates, thus maintaining information freshness while improving resource utilization efficiency.
Solution Approach 2:
The patent changes the transmission parameter from fixed periodic intervals to variable on-demand timing. By mapping different random access channel resources to different transmission triggers, the system dynamically adjusts transmission parameters based on actual terminal needs, ensuring information freshness is maintained only when necessary, thereby improving overall productivity.
3Productivity
If separate transmission methods are used for essential and non-essential system information, then transmission efficiency improves, but the optimal method is still unresolved
Solution Approach 1:
The patent creates a universal random access resource allocation mechanism that serves multiple functions: distinguishing terminal access purposes, triggering different transmission modes, and managing both essential and non-essential system information through a unified framework. This multi-functional approach improves transmission efficiency without significantly increasing system complexity.
Solution Approach 2:
The patent segments random access channel resources into different types (contention-based and contention-free) and further segments them by access purpose (initial access, system information request, or both). This segmentation allows efficient differentiation of transmission needs while maintaining a manageable system structure, resolving the complexity issue while achieving high transmission efficiency.
Data Source
AI summary
Embodiments of the present disclosure disclose a method for transmitting system information, a base station and a terminal, the method including: receiving, by a base station, MSG1 transmitted by a terminal; determining an access purpose of the terminal according to a preset mapping relationship between a physical random access channel resource used by the terminal to transmit the MSG1 and the access purpose of the terminal, the access purpose including requesting the system information, requesting initial access, or requesting the system information and the initial access at one time; transmitting, by the base station, MSG2 to the terminal if the access purpose of the terminal is to request the system information, or to request the system information and the initial access at one time. It is possible to transmit the system information according to the requirements of the terminal, which is beneficial to optimize the system efficiency.