On-Demand System Information Acquisition with Collision-Detecting Bit Patterns
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Solution Overview
Problem
The random access procedure in 3GPP NR for acquiring on-demand system information introduces significant control signaling overhead, particularly due to collisions and unnecessary re-transmissions during system information acquisition attempts.
Innovation Solution
Implementing a specific bit-pattern format in the system information request and contention resolution messages to detect collisions and avoid unnecessary re-transmissions, reducing signaling overhead by ensuring successful requests are acknowledged without invoking the contention resolution mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the random access procedure is used for acquiring on-demand system information, then the system information can be requested and received, but control signaling overhead increases significantly due to collisions and re-transmissions
Solution Approach 1:
The patent applies preliminary action by embedding collision detection capability in advance within the bit-pattern format of the system information request message. The base station pre-configures the bit-pattern structure to indicate whether a collision occurred, allowing the mobile terminal to detect collisions before initiating re-transmission procedures, thereby avoiding unnecessary re-transmissions and reducing control signaling overhead
Solution Approach 2:
The patent implements feedback by incorporating collision detection information in the bit-pattern of the system information request message. The base station provides feedback about collision status through the bit-pattern, enabling the mobile terminal to adjust its behavior accordingly - either proceeding with normal acquisition or avoiding redundant re-transmissions, thus reducing overall signaling overhead while maintaining reliable system information acquisition
2Reliability
If re-transmissions are performed during random access procedure, then collision issues are resolved, but signaling overhead and time consumption increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring the bit-pattern format to include collision detection indicators before the random access procedure begins. This allows the mobile terminal to detect collisions in advance through the bit-pattern and avoid unnecessary re-transmission delays, resolving collision issues more efficiently while reducing time consumption
Solution Approach 2:
The patent applies skipping by enabling the mobile terminal to skip redundant re-transmission steps when collisions are detected through the bit-pattern. Instead of following the complete re-transmission sequence, the terminal can directly proceed with alternative acquisition methods or wait for the next broadcast opportunity, thereby resolving collisions while minimizing time loss
Data Source
AI summary
The present disclosure relates to a mobile terminal and base station and respective operation methods. The mobile terminal comprises circuitry, which in operation, determines a condition for requesting on-demand a transmission of other system information; performs a random access procedure; and receives via broadcast a system information message including the on-demand requested other system information. The system information request message of the random access procedure includes an information element with a bit-pattern conforming to a specific format with at least a part of the bit-pattern for requesting the other system information. And the contention resolution message of the random access procedure includes the same, or the same part of the bit-pattern for detecting collisions during the random access procedure.