CQI Measurement Correction for LTE-NR Intra-Device Interference
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Solution Overview
Problem
In the context of 5G LTE-NR interworking networks, intra-device interference between LTE and NR radio frequency transceiver units in user equipment (UE) leads to inaccurate channel quality indication (CQI) information, affecting the base station's ability to determine a proper modulation and coding scheme for scheduling, resulting in improper data rates.
Innovation Solution
A method for determining CQI information by identifying interference sub-bands and interference-free sub-bands within the UE, and using preset offsets to modify CQI measurements, ensuring accurate CQI reporting and scheduling by the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LTE and NR radio frequency transceiver units simultaneously work in UE, then 5G network functionality is achieved, but intra-device interference occurs affecting CQI accuracy
Solution Approach 1:
The patent segments the frequency spectrum into interference sub-bands and interference-free sub-bands. The base station identifies which sub-bands are affected by intra-device interference and separately determines CQI for each type of sub-band, applying different offset values accordingly. This segmentation allows accurate CQI measurement while maintaining 5G functionality.
Solution Approach 2:
The patent introduces offset parameters to adjust CQI measurements based on interference conditions. By changing the CQI parameter through addition of offset values (positive or negative), the system compensates for interference effects and maintains measurement accuracy despite simultaneous LTE and NR operation.
2Ease of operation
If CQI measurements are performed without considering intra-device interference, then measurement simplicity is maintained, but modulation and coding scheme determination becomes inaccurate
Solution Approach 1:
The base station performs preliminary identification of interference sub-bands and determines offset values before CQI measurement and reporting. By preparing the interference compensation parameters in advance, the system maintains simple measurement procedures at the UE while ensuring reliable CQI determination at the base station through pre-calculated offsets.
Solution Approach 2:
The offset value acts as an intermediary parameter that bridges the gap between simple UE measurements and reliable base station scheduling decisions. The UE performs straightforward CQI measurements and reports them along with interference indicators, while the base station uses the offset intermediary to adjust the final CQI value for accurate modulation and coding scheme selection.
Data Source
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AI summary
Provided are a method for determining CQI information, a base station, and a user equipment. The method comprises: determining whether the situations, where intra-device interference occurs, of a target user equipment during a CQI measurement time period and a postorder downlink scheduling time period of a target bandwidth granularity are the same; and if the situations, where intra-device interference occurs, are different, determining, according to a preset offset, a target CQI grade for serving inorder and postorder downlink scheduling of the target bandwidth granularity. By means of the method for determining CQI information provided in the present disclosure, the accuracy of a CQI grade serving downlink scheduling of a target UE can be effectively improved, so that the precision of a modulation and coding mode used in the downlink scheduling of the target UE is effectively improved, and an accurate downlink transmission rate is then used to transmit downlink information to the target UE, thereby improving the overall performance of a system.