Base Station CQI Reporting Mode Selection
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Solution Overview
Problem
Current methods for reporting channel quality indicators (CQIs) from user devices to base stations lack guidance on selecting and combining reporting modes, which affects the efficiency and accuracy of channel quality information transmission in mobile communication systems.
Innovation Solution
A method is introduced where a base station detects user device information, including moving speed and number of user devices, to determine the appropriate CQI reporting mode, selecting between wideband and subband CQIs, and deciding on the use of physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH) based on reference values and quality requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the user device reports both wideband CQI and subband CQIs, then the accuracy of channel quality information is improved, but the uplink control channel resources are increased
Solution Approach 1:
The patent changes the parameter of CQI reporting by selectively reporting either wideband CQI or subband CQIs based on the determined reporting mode, rather than always reporting both types, thus balancing accuracy requirements with resource constraints
Solution Approach 2:
The patent implements dynamic CQI reporting mode determination at the base station, allowing the system to adaptively select between different reporting configurations (wideband only, subband only, or both) based on current channel conditions and system state
2Adaptability or versatility
If the base station determines CQI reporting mode based on user device information, then the adaptability of the system is improved, but the complexity of the base station is increased
Solution Approach 1:
The patent applies preliminary action by having the base station determine the CQI reporting mode in advance based on detected user device information (such as velocity), so that the appropriate reporting configuration is established before actual CQI reporting occurs, simplifying the real-time processing complexity
Data Source
AI summary
A base station for a mobile communication system includes a speed detecting unit configured to detect the moving speed of a user device based on a signal received from the user device and indicating the moving speed; and a determining unit configured to select, based on the moving speed detected by the speed detecting unit, a wideband channel quality indicator indicating reception quality of an entire system frequency band allocated to the mobile communication system, or a combination of the wideband channel quality indicator and one or more channel quality indicators of subbands in the system frequency band as channel quality information that needs to be reported from the user device to the base station.