RMSI Version Identifiers for Faster Cell Access Under Poor Channels
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Solution Overview
Problem
Decoding of remaining minimum system information (RMSI) is a bottleneck in wireless communications systems, especially under poor channel conditions, leading to inefficient cell access.
Innovation Solution
Implementing version identifiers (IDs) for RMSI, where a UE refrains from decoding another RMSI with the same ID within a specified time window after successfully decoding it, allowing access in poor channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE repeatedly decodes RMSI under poor channel conditions, then the reliability of cell access improves, but the time consumption and energy consumption increase
Solution Approach 1:
The network pre-configures a time window for RMSI validity and assigns version IDs to RMSI messages. The UE uses these pre-configured parameters to determine whether to decode RMSI or reuse previously decoded information, avoiding unnecessary repeated decoding attempts under poor channel conditions.
Solution Approach 2:
The patent introduces version ID as a new parameter to identify RMSI validity and time window configuration to control decoding timing. By changing these parameters, the system enables the UE to efficiently determine whether RMSI decoding is necessary, reducing time consumption while maintaining access reliability.
2Reliability
If the UE decodes multiple RMSI messages to ensure successful cell access, then the reliability improves, but the energy consumption increases
Solution Approach 1:
The network provides pre-configuration including time window parameters and version ID assignments before the UE needs to access the cell. This allows the UE to make informed decisions about whether to decode RMSI based on pre-available information, reducing unnecessary energy expenditure on repeated decoding operations.
Solution Approach 2:
The version ID mechanism provides feedback to the UE about the validity and currency of RMSI messages. The UE uses this feedback to determine whether previous decoding attempts are still valid or if new decoding is required, optimizing energy usage by avoiding redundant decoding operations.
3Reliability
If the network transmits multiple RMSI repetitions to improve decoding success rate, then the reliability improves, but the system resource consumption increases
Solution Approach 1:
The network pre-configures time windows and version IDs for RMSI messages, enabling UEs to efficiently determine whether to attempt decoding or reuse existing information. This reduces the need for multiple RMSI transmissions, thereby conserving system resources while maintaining reliable access.
Solution Approach 2:
By introducing version ID and time window parameters, the system enables intelligent differentiation between UEs that need to decode RMSI and those that can reuse previous decodings. This parameter-based approach reduces unnecessary RMSI transmissions and optimizes resource utilization.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Remaining minimum system information (RMSI) (e.g., system information block one (SIB1)) may be associated with version identifiers (IDs). The master information block (MIB) in a physical broadcast channel (PBCH) transmission may include an indication of version ID associated with RMSI transmitted by the corresponding cell for a given time window. Accordingly, during a time window after the PBCH transmission, a user equipment (UE) which receives the PBCH transmission may determine whether to decode a subsequent RMSI physical downlink shared channel transmission for the cell based on whether the UE previously successfully decoded an RMSI associated with the version ID indicated by the PBCH transmission.