On-Demand System Information Request via Random Access Preamble
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Solution Overview
Problem
As the number of system information blocks increases in wireless communication systems, the radio resources required to broadcast these blocks also increase, leading to inefficiencies in radio resource utilization for transmitting system information to user equipment (UE).
Innovation Solution
A method is proposed where a UE can efficiently request system information by using a new-type system information structure that includes minimum system information periodically broadcasted and other system information available on-demand, allowing the UE to request specific system information through a random access procedure, which may include transmitting a random access preamble and receiving a response with only a random access preamble identifier (RAPID), thereby reducing the need for additional messages and conserving radio resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the number of system information blocks is increased to transmit more system information, then the system information coverage is improved, but the radio resources required for broadcasting increase
Solution Approach 1:
The patent divides system information into two categories: minimum system information (broadcast periodically) and other system information (available on-demand). This segmentation allows essential information to be always available while reducing the need to broadcast all system information blocks continuously, thereby conserving radio resources.
Solution Approach 2:
The patent enables user equipment to autonomously request specific system information blocks through a random access procedure when needed, rather than relying on continuous broadcasting. This self-service mechanism allows UEs to obtain required system information efficiently without consuming additional broadcast resources.
2Reliability
If a conventional random access procedure with multiple messages is used, then reliable communication is established, but radio resources and battery consumption increase
Solution Approach 1:
The patent extracts and removes unnecessary messages from the conventional four-step random access procedure. By eliminating the third message (uplink data transmission) when it is not required for system information requests, the procedure is simplified to two messages, reducing radio resource usage and battery consumption while maintaining reliability for system information acquisition.
3Loss of information
If all system information blocks are broadcast periodically, then system information availability is improved, but radio resource utilization deteriorates
Solution Approach 1:
The patent segments system information into minimum system information that is broadcast periodically to ensure availability, and other system information that is provided on-demand through optimized random access procedures. This segmentation improves radio resource utilization by avoiding redundant broadcasting of non-essential system information blocks.
Solution Approach 2:
The patent maintains periodic broadcasting only for minimum system information blocks that are essential for initial access and basic operations, while eliminating periodic broadcasting for other system information blocks. This periodic action approach optimizes radio resource utilization by transmitting system information only when necessary.
Data Source
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AI summary
A method by which a terminal requests system information in a wireless communication system and a device supporting same are provided. The method can include: a step for transmitting, to a base station, a random access preamble for requesting system information; a step for receiving, from the base station, a random access response that only includes a random access preamble identifier (RAPID) corresponding to the transmitted random access preamble; and a step for deeming a random access procedure completed.