User Terminal System Information Request via Random Access
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Solution Overview
Problem
In wireless communication systems, user terminals face high power consumption and excessive system information overhead due to the broadcasting of all system information, including Master Information Block (MIB) and System Information Blocks (SIBs), resulting in unnecessary data reception.
Innovation Solution
A system information transmission method where a user terminal sends a system information request to a base station through an uplink message in a random access procedure and, upon successful completion, does not set a Cell-Radio Network Temporary Identifier (C-RNTI), allowing it to receive only the requested system information, thereby reducing power consumption and overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all system information (MIB, SIB1-SIB20) is broadcast every time, then the base station ensures complete system information availability, but the user terminal receives unnecessary information causing high power consumption and excessive system information overhead
Solution Approach 1:
The patent extracts only the necessary system information that the user terminal needs from the complete set of system information. The terminal sends a request indicating specific SIBs it requires, and the base station responds by broadcasting only those requested SIBs rather than all available system information, thereby reducing power consumption while maintaining reliability for needed information.
Solution Approach 2:
The patent changes the parameter of system information transmission from a fixed broadcast of all SIBs to a dynamic selection based on terminal requests. The base station adjusts which SIBs are transmitted according to the specific needs indicated by different terminals, optimizing the balance between information availability and power consumption.
2Reliability
If all system information (MIB, SIB1-SIB20) is broadcast every time, then the base station ensures complete system information availability, but the system information overhead in the wireless communication system becomes excessive
Solution Approach 1:
The patent extracts and transmits only the specific system information blocks that are requested by user terminals, removing unnecessary SIBs from the broadcast. This extraction approach significantly reduces system information overhead while ensuring that all requested information is reliably delivered.
3Reliability
If the user terminal continuously monitors the control channel to receive system information, then the terminal ensures it receives all system information updates, but the power consumption increases
Solution Approach 1:
The patent replaces continuous monitoring with periodic action by having the terminal monitor the control channel only at specific moments: when it sends a system information request and when it expects to receive the requested SIBs. This periodic monitoring approach maintains reliable reception while dramatically reducing power consumption compared to continuous monitoring.
4Use of energy by moving object
If the user terminal requests specific system information through random access procedure, then the terminal receives only necessary information reducing power consumption, but the device complexity of the random access procedure increases
Solution Approach 1:
The patent leverages the existing random access procedure, which is a universal mechanism already present in the wireless communication system for multiple purposes. By reusing this existing multi-functional procedure for system information requests, the patent avoids adding completely new complex signaling mechanisms, thereby reducing the increase in device complexity while still achieving targeted information retrieval.
Data Source
AI summary
The embodiments of the present disclosure provide a system information transmission method and a user terminal. The method includes: sending a system information request to a base station through an uplink message in a random access procedure; not setting a C-RNTI), and receiving system information corresponding to the system information request sent by the base station, if the random access procedure is successful.