Base Station Pre-Coding Feedback Priority Management
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Solution Overview
Problem
In mobile communication systems, the existing methods for transmitting feedback information about transmit signal pre-coding face issues where high-priority pre-coding information is overwritten by low-priority information, leading to inefficient and unreliable data transmission due to the use of multiple feedback modes and sub-frames.
Innovation Solution
The system employs a mobile communication method where the mobile station apparatus transmits feedback information based on multiple feedback schemes, and the base station apparatus performs pre-coding on the downlink signal, including transmit signal pre-coder confirmation that specifies the pre-coding sequence used, ensuring that the highest priority pre-coding information is employed based on time, difference in feedback schemes, and frequency channel width, and invalidating the pre-coding confirmation after a predetermined time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple feedback modes and sub-frames are used for transmitting pre-coding information, then the system can support diverse communication requirements and improve adaptability, but high-priority pre-coding information may be overwritten by low-priority information leading to reduced reliability
Solution Approach 1:
The base station determines in advance which feedback mode (first or second) has higher priority for transmitting pre-coding information. This preliminary determination of priority relationships prevents confusion and ensures that high-priority information is always preserved, resolving the contradiction by establishing a clear hierarchy before the overwriting issue can occur.
Solution Approach 2:
The system implements a feedback mechanism where the base station sends downlink control information indicating which feedback mode should be prioritized. This feedback loop allows the base station to dynamically control the priority relationship between feedback modes, ensuring that the most critical pre-coding information is always transmitted reliably while maintaining support for multiple feedback schemes.
2Productivity
If pre-coding information is transmitted frequently across multiple sub-frames, then the system can adapt to changing channel conditions and improve communication efficiency, but the complexity of managing multiple feedback modes increases
Solution Approach 1:
The priority relationship between feedback modes is made dynamic rather than fixed. The base station can adjust which feedback mode has priority based on current channel conditions and communication requirements by sending appropriate downlink control information. This dynamic adjustment allows the system to optimize performance without requiring complex permanent configuration for all possible scenarios.
Solution Approach 2:
The system design allows a single feedback mode to serve multiple functions - it can be used for both high-priority and low-priority pre-coding information transmission depending on the situation. This multi-functionality reduces the need for separate dedicated mechanisms for each priority level, thereby reducing overall system complexity while maintaining adaptability.
Data Source
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AI summary
When transmission of a downlink signal is to be performed in sub-frame 5, at this point, no feedback of reception quality information and transmit signal pre-coding information in mode 2, which would be covered by transmit signal pre-coder confirmation, has been performed. Therefore, information on the pre-coding that has been applied to all assigned resources is transmitted by being added to a downlink control signal (353). In sub-frame 9, a downlink signal is transmitted, and transmit signal pre-coder confirmation is added thereto. With respect to this case, the mobile station apparatus determines that the downlink signal has been pre-coded using the transmit signal pre-coding information transmitted in sub-frame 8, and demodulates the received signal with it. Sub-frame 12 represents a case where downlink data is transmitted by assigning sub-band 7. In so doing, it is preferable that the base station apparatus use the reception quality information and transmit signal pre-coding information for sub-band 7 reported in sub-frame 10. Accordingly, the base station apparatus transmits to the mobile station apparatus the transmit signal pre-coding information obtained in sub-frame 10 by explicitly including it in downlink control information (358). Thus, in cases where there exist a plurality of modes for transmitting transmit signal pre-coding information, it is possible to solve the problem where information whose priority should be high is readily overwritten by information of low priority.