Mobile Station Feedback for DRX Reception Quality
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Solution Overview
Problem
In conventional mobile communication systems, the base station apparatus lacks accurate transmission signal precoding information during periods of discontinuous reception (DRX), leading to unreliable reception quality information and potential deterioration in downlink reception characteristics, especially when propagation path conditions change rapidly.
Innovation Solution
The mobile station apparatus calculates and transmits reception quality information using either current or predefined transmission signal precoding information, ensuring continuous feedback to the base station apparatus, even during DRX periods, by employing predefined precoding sequences to maintain communication resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the mobile station apparatus transmits reception quality information based on current transmission signal precoding information, then the accuracy of reception quality feedback is improved, but during DRX periods when precoding information is not transmitted, the base station lacks accurate precoding information leading to unreliable reception quality information
Solution Approach 1:
The mobile station apparatus performs preliminary calculation of reception quality information using predefined transmission signal precoding information before actual data transmission occurs. This allows the base station to have accurate reception quality feedback even during DRX periods when real-time precoding information is not available, as the preliminary calculation is based on predetermined precoding sequences.
Solution Approach 2:
Predefined transmission signal precoding information acts as an intermediary during DRX periods. Instead of requiring real-time precoding information from the base station, the mobile station uses these predefined values as a substitute, allowing continuous and reliable reception quality feedback without disrupting the DRX operation or requiring base station wake-up.
2Reliability
If the mobile station apparatus continuously transmits feedback information including transmission signal precoding information, then the base station always has accurate precoding information for resource allocation, but power consumption increases and DRX benefits are reduced
Solution Approach 1:
The system adopts periodic feedback transmission aligned with DRX cycles. The mobile station apparatus transmits feedback information including reception quality based on predefined precoding information during active periods, then enters low-power DRX state. This periodic operation maintains necessary communication reliability while preserving the power-saving benefits of discontinuous reception.
Solution Approach 2:
The mobile station apparatus serves itself by autonomously calculating reception quality information using locally stored predefined transmission signal precoding information during DRX periods. This self-service capability eliminates the need for continuous base station interaction or wake-up events, maintaining feedback reliability while minimizing power consumption through autonomous operation during low-power states.
3Use of energy by stationary object
If the base station apparatus uses outdated transmission signal precoding information during DRX periods, then power saving is achieved, but downlink reception characteristics deteriorate due to mismatched precoding and reception quality information
Solution Approach 1:
The mobile station apparatus performs preliminary calculation of reception quality information using predefined transmission signal precoding information that matches what the base station will use. This preliminary action ensures that when the base station wakes up to transmit data using its stored precoding information, the reception quality feedback already available is based on matching precoding parameters, preventing deterioration in downlink reception characteristics.
Solution Approach 2:
The system implements a feedback mechanism where the mobile station continuously provides reception quality information based on predefined precoding sequences even during DRX periods. This feedback loop allows the base station to maintain accurate knowledge of downlink channel conditions and adjust its use of stored precoding information accordingly, preventing reception characteristic deterioration while maintaining power-saving operation.
Data Source
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AI summary
In the case that the transmission signal precoding information cannot be transmitted, the transmission signal precoding information is clarified that is used to calculate the reception quality information performed immediately after the case, and a base station apparatus perform suitable communication resource allocation. A mobile station apparatus has a feedback information control section 65 that generates feedback information including the reception quality information and the transmission signal precoding information, and transmission sections 41, 43 to 45 and 47 that transmit the generated feedback information to the base station apparatus, and when the transmission sections 41, 43 to 45 and 47 do not transmit the transmission signal precoding information with communication resources allocated from the base station apparatus to transmit the transmission signal precoding information, the feedback information control section calculates the reception quality information transmitted for a period during which the sections do not transmit the transmission signal precoding information and next transmit the transmission signal precoding information, using beforehand defined transmission signal precoding information.