Aperiodic CQI Feedback for Dual Flow Beam Formation
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Solution Overview
Problem
The LTE system lacks a designed transmission mode and aperiodic channel quality information (COI) feedback mode to support the formation of dual flow beams, leading to inadequate channel information feedback for multi-antenna technologies.
Innovation Solution
An aperiodic channel quality information sending method is introduced that pre-appoints transmission modes and corresponding COI feedback modes to support dual flow beam formation, utilizing existing COI feedback modes without adding new formats, and includes rank feedback to facilitate handover between single and dual flow beams, with options for COI feedback with or without PMI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing CQI feedback modes are used without modification, then the feedback format remains simple and compatible, but the feedback cannot support dual flow beam formation
Solution Approach 1:
The patent extends existing CQI feedback modes to support both single flow and dual flow beam operations. By configuring the feedback content to include CQI for multiple transport blocks and adjusting the interpretation of feedback parameters, the same feedback mode structure serves multiple transmission scenarios, enabling dual flow beam support without creating entirely new feedback formats.
Solution Approach 2:
The patent introduces dynamic configuration where the feedback content and interpretation are adapted based on the current transmission mode and rank indication. The system dynamically selects which CQI values to report and how to interpret PMI feedback based on whether single flow or dual flow operation is active, allowing the feedback mechanism to flexibly support different beam formation scenarios.
2Adaptability or versatility
If new CQI feedback formats are designed to support dual flow beam, then the feedback requirements are met, but signaling overhead increases
Solution Approach 1:
The patent reuses existing CQI feedback mode structures (modes 1-2, 2-0, 2-2, 3-0, 3-1) to support dual flow beam operations. By configuring these existing modes with appropriate parameters for multi-transport block feedback, the system avoids creating new feedback formats, thereby meeting dual flow requirements while keeping signaling overhead comparable to existing single flow operations.
3Adaptability or versatility
If rank feedback is included to support handover between single and dual flow beams, then beam handover capability is improved, but feedback dimensionality and overhead increase
Solution Approach 1:
The patent makes the feedback content dynamic based on the rank indication. When rank=1, the feedback structure corresponds to single flow mode; when rank=2, the same feedback structure is interpreted as dual flow mode with appropriate CQI and PMI values for each transport block. This dynamic interpretation approach enables beam handover capability without permanently increasing feedback dimensionality, as the additional dimensions are only activated when needed.
4Productivity
If PMI feedback is included to increase feedback dimensionality, then system throughput is improved, but feedback overhead increases
Solution Approach 1:
The patent dynamically includes or excludes PMI feedback based on the configured transmission mode and current operating conditions. When dual flow beam operation is active and channel conditions warrant spatial multiplexing, PMI feedback is included to enable precise beamforming and increase throughput. When not needed, the system operates without PMI feedback, keeping overhead minimal. This dynamic approach allows throughput optimization only when the additional feedback dimensionality provides actual benefit.
Data Source
Figure 1
AI summary
The present invention provides an aperiodic channel quality information sending method and a mobile terminal. The method comprises: a mobile terminal and network side pre-appointing one or more transmission modes which support the forming of dual flow beam, and aperiodic channel quality information CQI feedback mode(s) corresponding to the transmission modesâ–ˇthe network side indicating the mobile terminal with one pre-appointed transmission mode to be adopted, wherein when the mobile terminal receiving the indication of adopting the one pre-appointed transmission mode, the mobile terminal adopts the aperiodic CQI feedback mode corresponding to the one pre-appointed transmission mode to feed back the CQI information to the network side. The method of the present invention facilitates the reduction of signaling overhead and feedback overhead, the increase of the feedback dimensionality of the channel information, and the improvement of the throughput of the system.