RMSI Combining Across Extended Periods for Low-SNR Decoding
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Solution Overview
Problem
Wireless communication systems face challenges in decoding Remaining Minimum System Information (RMSI) due to high coding rates and limited resources, requiring high signal-to-noise ratios, especially when RMSI is transmitted less frequently than synchronization signal blocks (SSBs).
Innovation Solution
Implementing a dynamic RMSI periodicity and bundling of RMSI periods to enable combining RMSI messages over a longer time frame, allowing UEs to decode RMSI more effectively by extending the RMSI period and combining multiple messages, which is dynamically indicated by the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If RMSI is transmitted less frequently to save resources, then resource efficiency is improved, but decoding reliability deteriorates due to high coding rates and limited transmission opportunities
Solution Approach 1:
The patent combines multiple RMSI transmissions from different periods into a single decoding operation. The UE receives RMSI messages across multiple periods and combines them using soft combining techniques, allowing the system to maintain lower transmission frequency while improving decoding reliability through cumulative signal accumulation.
Solution Approach 2:
The patent introduces dynamic RMSI periodicity where the network can adjust the periodicity based on channel conditions and UE requirements. This dynamic adjustment allows the system to optimize between resource efficiency and decoding reliability by adapting transmission frequency to actual needs rather than using a fixed periodicity.
2Reliability
If RMSI periodicity is extended to combine multiple messages, then decoding reliability is improved, but time delay increases for receiving complete RMSI information
Solution Approach 1:
The patent prepares for potential decoding failures by pre-configuring the UE with combining capabilities and maintaining buffers for multiple RMSI transmissions. This preliminary preparation allows the system to quickly combine and decode RMSI messages when they become available, reducing the effective time delay despite extended periodicity.
Solution Approach 2:
The patent utilizes periodic RMSI transmissions at extended intervals, where each period contributes to the cumulative decoding process. The periodic nature allows the system to spread transmissions over time while maintaining a structured approach to combining, balancing the need for reliability with acceptable time delays.
3Loss of energy
If high coding rates are used for RMSI transmission, then resource efficiency is improved, but signal-to-noise ratio requirements increase making decoding more difficult
Solution Approach 1:
The patent transmits copies of the same RMSI information across multiple periods, allowing the UE to combine these copies to overcome the high coding rate limitations. Each transmission contains the same encoded information, and combining multiple copies effectively increases the signal-to-noise ratio without requiring higher individual transmission power.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Remaining minimum system information (RMSI) may include information for a user equipment (UE) to access a cell. The network may transmit multiple repetitions of RMSI with an RMSI period in accordance with an RMSI periodicity, and UE may use (e.g., may combine) the multiple repetitions of RMSI to correctly decode RMSI as each RMSI within a same RMSI period may be expected to have the same RMSI payload. The RMSI periodicity (e.g., the length of the RMSI period) may be dynamically extended, or multiple RMSI periods may be bunded together to enable the UE to combine RMSI messages received over a longer period of time to decode the RMSI.