Adaptive TBS Configuration for Accurate CQI Reporting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In mobile communications, CQI reporting does not accurately account for the impact of transport block size (TBS) differences between the user equipment (UE) and the base station, leading to inaccurate modulation coding scheme (MCS) selection due to misestimation of signal-to-noise or interference ratios (SINR).
Innovation Solution
The proposed solution involves configuring the UE with specific transport block sizes (TBS) for CQI reporting, using scaling factors, reference radio resources, and additional parameters to enhance CQI reporting accuracy, including reporting MCS and CQI offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the UE uses a fixed reference TBS for CQI reporting, then the CQI reporting process is simple, but the CQI values become inaccurate when the actual TBS differs from the reference TBS
Solution Approach 1:
The patent applies dynamics by making the TBS configuration adjustable and adaptive. Instead of using a fixed reference TBS, the system dynamically configures the TBS based on actual transmission conditions and network requirements. This allows the CQI reporting to adapt to different TBS values while maintaining accuracy in SINR estimation and MCS selection.
Solution Approach 2:
The patent changes the parameter of TBS from a fixed reference value to a configurable parameter that can be adjusted according to actual transmission conditions. By allowing the TBS to vary based on network configuration and transmission requirements, the system maintains accurate CQI reporting across different transmission scenarios without sacrificing simplicity.
2Device complexity
If the base station uses inaccurate SINR estimation due to TBS mismatch, then the MCS selection process is simplified, but the communication reliability deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where the UE reports CQI values based on configured TBS parameters, and the base station uses this feedback information to accurately determine the appropriate MCS. This feedback loop ensures that the base station receives accurate SINR estimation data and can reliably select MCS values that match the actual transmission conditions, improving communication reliability.
Solution Approach 2:
The patent applies preliminary action by having the network configure the TBS parameter before CQI reporting occurs. This preliminary configuration ensures that when the UE calculates CQI values, it uses the correct TBS that matches the actual transmission conditions, allowing the base station to accurately estimate SINR and select appropriate MCS values without requiring complex real-time adjustments.
3Device complexity
If the UE reports CQI based on a single TBS, then the reporting format is simple, but the system cannot accurately support multiple TBS scenarios
Solution Approach 1:
The patent applies universality by designing a CQI reporting mechanism that can handle multiple TBS scenarios through a single unified approach. The network configures the TBS parameter, and the UE uses this configured value to calculate CQI values that are valid for the actual transmission conditions. This universal mechanism allows the system to support various TBS scenarios without requiring separate reporting formats for each case.
Data Source
AI summary
Various solutions pertaining to enhancements for channel quality indicator (CQI) reporting in mobile communications are described. An apparatus implemented in a user equipment (UE) generates a CQI report using a transport block (TB) size. The apparatus then transmit the CQI report to a network. The TB size is either configured by the network or calculated by the apparatus. In case the TB size is calculated, the apparatus calculates the TB size using either a scaling factor or one or more values related to reference radio resources.