Adaptive Reporting Assistance for Wireless Downlink Performance
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Solution Overview
Problem
Existing communication technologies face challenges in selecting the optimal reporting method for user equipment (UE) in wireless communication networks, leading to sub-optimal downlink channel performance due to excessive re-transmissions and inefficient bandwidth usage.
Innovation Solution
A method where the UE monitors downlink parameters and provides reporting method assistance information to the network node, which includes channel quality information (CQI) and transmission error reporting indications, to help the network node select the most suitable reporting method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the network node selects a reporting method without UE feedback, then the network node maintains control over the reporting configuration, but the reporting method may not be optimally suited for the current downlink reception conditions, causing excessive re-transmissions and inefficient bandwidth usage
Solution Approach 1:
The UE monitors downlink parameters and provides feedback (reporting method assistance information) to the network node about the current downlink reception conditions. This feedback enables the network node to adaptively select the optimal reporting method (wideband CQI, narrowband CQI, TB-based HARQ, or CBG-based HARQ) based on actual channel conditions, thereby improving downlink channel performance while reducing excessive re-transmissions
Solution Approach 2:
The reporting method is made dynamic and adaptable rather than fixed. The UE continuously monitors downlink parameters and updates its assistance information based on changing channel conditions. This allows the system to transition between different reporting methods (e.g., from wideband CQI to narrowband CQI, or from TB-based HARQ to CBG-based HARQ) to optimize performance under varying conditions
2Quantity of substance
If wideband CQI reporting is used, then the reporting overhead is reduced, but the downlink channel performance suffers due to excessive forward error correction
Solution Approach 1:
The system dynamically switches between wideband CQI and narrowband CQI reporting based on monitored downlink parameters. When channel conditions are stable and uniform, wideband CQI is used to minimize overhead. When channel conditions vary significantly across frequency bands or deteriorate, the UE provides assistance information triggering a switch to narrowband CQI reporting, which provides more granular channel quality information and enables more precise adaptive modulation and coding, thereby improving downlink channel performance
Solution Approach 2:
The reporting granularity parameter is changed adaptively. The system transitions from coarse-grained wideband CQI reporting to fine-grained narrowband CQI reporting based on channel conditions. This parameter change allows the system to balance between reporting overhead and the precision needed for optimal downlink channel performance, ensuring that forward error correction is applied appropriately rather than excessively
3Quantity of substance
If TB-based HARQ is used, then the reporting signaling overhead is reduced, but the downlink channel performance suffers due to avoidable re-transmitted downlink traffic
Solution Approach 1:
The system dynamically selects between TB-based HARQ and CBG-based HARQ based on monitored downlink parameters and channel conditions. When channel conditions are good and stable, TB-based HARQ is used to minimize signaling overhead. When channel conditions deteriorate or show patterns of partial failures, the UE provides assistance information that triggers a switch to CBG-based HARQ, which allows selective re-transmission of only the failed code block groups rather than entire transport blocks, thereby reducing avoidable re-transmitted downlink traffic and improving downlink channel performance
Solution Approach 2:
The transport block is segmented into code block groups (CBGs) for independent error detection and re-transmission. This segmentation enables the system to apply CBG-based HARQ when needed, where only the specific failed CBGs are re-transmitted rather than the entire TB. This resolves the contradiction by providing a middle ground between the low overhead of TB-based HARQ and the high efficiency of selective re-transmission, adapting the segmentation level to channel conditions
Data Source
AI summary
Methods, apparatus and systems for adaptive signal quality and/or transmission error reporting in a communication network are disclosed.