Rank Indication Reporting Overhead Reduction via Bitmap Configuration
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Solution Overview
Problem
The conflict between the rank indication restriction parameter and the Num_CQI/Max_Num_CQI parameter in communication systems prevents terminal devices from performing rank indication reporting, leading to system bugs and unnecessary reporting overheads.
Innovation Solution
The proposed solution configures the rank indication restriction parameter to allow specific ranks to be reported by the terminal device, even when the Num_CQI/Max_Num_CQI parameter is not configured or is set to 1, using a bitmap of eight bits to indicate which ranks are allowed for reporting, and determines the number of bits for reporting based on the number of allowed ranks, reducing reporting overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the RI restriction parameter is configured to restrict ranks to be reported, then the reporting overhead is reduced, but the terminal device cannot perform RI reporting when it conflicts with the Num_CQI/Max_Num_CQI parameter
Solution Approach 1:
The patent changes the parameter configuration by introducing a new parameter relationship rule: when Num_CQI/Max_Num_CQI is not configured or is 1, the RI restriction parameter must allow at least one rank from indices 0-3 to be reported. This parameter change resolves the conflict between RI restriction and CQI number configuration, ensuring RI reporting functionality is maintained while still enabling overhead reduction through selective rank restriction.
2Reliability
If the RI restriction parameter is configured to allow specific ranks to be reported, then the terminal device can perform RI reporting, but the reporting overhead increases
Solution Approach 1:
The patent applies local quality by making the RI restriction configuration context-dependent. When Num_CQI/Max_Num_CQI is not configured or equals 1, the system allows broader rank reporting (indices 0-3) to ensure functionality. When Num_CQI/Max_Num_CQI is configured with higher values, the system can enforce stricter rank restrictions to reduce overhead. This localized quality adjustment optimizes the balance between reliability and overhead based on specific configuration scenarios.
Data Source
AI summary
This application provides a technical solution for rank indication, and especially when a CQI number is not configured or a CQI number is 1, a network device configures a rank indication restriction parameter as that at least one of ranks whose index numbers are 0, 1, 2, and 3 is allowed to be reported by the terminal device; or even if the network device does not perform the foregoing configuration, and none of the ranks whose index numbers are 0, 1, 2, and 3 is allowed to be reported, the terminal device may select at least one rank for RI reporting, so as to resolve a problem that a system cannot work. In addition, according to embodiments of this application, bit overheads required for RI reporting may further be reduced.