PMI Subband Size Matching via Terminal Capability Reporting
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Solution Overview
Problem
In communication systems, the mismatch between the PMI subband size supported by a terminal and the PMI subband size understood by the network leads to poor performance, as the terminal's PMI subband size may not match the CQI subband size, resulting in inaccurate PMI feedback and deteriorated communication efficiency.
Innovation Solution
A method where the terminal reports capability information indicating its support for a PMI subband size less than the CQI subband size, allowing the network to adjust PMI feedback accordingly, ensuring the PMI subband size matches the CQI subband size, thereby improving communication performance and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal uses a PMI subband size that does not match the CQI subband size, then the terminal can operate with its supported configuration, but the PMI feedback accuracy deteriorates and communication performance worsens
Solution Approach 1:
The patent implements dynamic adaptation of PMI subband size based on terminal capability reporting. The network device receives capability information indicating whether the terminal supports PMI subband size less than CQI subband size, and dynamically configures the appropriate PMI subband size accordingly. This dynamic configuration ensures that the PMI subband size matches the terminal's actual capabilities while maintaining alignment with CQI subband size, thereby preserving PMI feedback accuracy without sacrificing adaptability.
2Device complexity
If the network device configures PMI subband size without considering terminal capability, then the configuration process is simple, but the terminal performance deteriorates due to mismatch
Solution Approach 1:
The patent applies preliminary action by having the terminal report its capability information regarding PMI subband size support before the network device performs PMI subband size configuration. This advance capability reporting allows the network device to configure the PMI subband size with full knowledge of terminal capabilities, ensuring proper matching between PMI and CQI subband sizes. The capability reporting mechanism is integrated into the existing uplink control channel, so the additional complexity is minimal while terminal performance reliability is significantly improved.
3Productivity
If the terminal reports capability information about PMI subband size support, then the network can optimize PMI configuration, but the signaling overhead increases
Solution Approach 1:
The patent changes the parameter representation by encoding terminal capability information in a compact form. Instead of reporting detailed capability sets, the terminal reports a simplified indicator (e.g., a binary flag or compact index) that conveys whether the terminal supports PMI subband size less than CQI subband size. This parameter transformation reduces the signaling overhead significantly while still providing the network device with sufficient information to optimize PMI configuration and improve communication efficiency.
Data Source
AI summary
A capability information reporting method includes: reporting capability information, the capability information being used to indicate whether a terminal supports a first capability, and the first capability being a capability of supporting that a PMI subband size is less than a CQI subband size.