Terminal Device Subframe Allocation for CSI Management
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Solution Overview
Problem
The existing wireless communication systems, particularly in LTE, have not adequately addressed the efficient use and management of channel state information, leading to suboptimal communication performance in scenarios with multiple cells and varying uplink-downlink configurations.
Innovation Solution
The proposed solution involves a wireless communication method and terminal device that utilize advanced uplink-downlink configuration settings and reference configurations to efficiently manage channel state information, allowing for efficient communication in systems with cell aggregation, including half-duplex and full-duplex TDD schemes, by specifying subframe allocations and reference configurations for both uplink and downlink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple cells with different uplink-downlink configurations are aggregated, then traffic adaptation and interference reduction are improved, but channel state information management becomes complex and communication efficiency deteriorates
Solution Approach 1:
The patent introduces a reference configuration as an intermediary that mediates between multiple cells with different uplink-downlink configurations. The terminal device uses this reference configuration to determine valid downlink subframes and CSI reference resources, simplifying the management of channel state information across aggregated cells while maintaining traffic adaptation capabilities.
Solution Approach 2:
The patent applies local quality by allowing different cells to have different uplink-downlink configurations tailored to their specific traffic needs, while using a unified reference configuration for CSI management. This enables each cell to optimize its local characteristics while maintaining system-wide coordination.
2Adaptability or versatility
If flexible subframes are used for dynamic TDD, then traffic adaptation is improved, but subframe allocation complexity and communication reliability deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-configuring reference uplink-downlink configurations and determining valid downlink subframes in advance based on these reference configurations. This allows the terminal device to prepare CSI measurement and reporting resources beforehand, ensuring reliable communication even in dynamic TDD scenarios where subframe allocations may change.
3Adaptability or versatility
If CSI reference resources are not properly defined in dynamic TDD, then traffic adaptation flexibility is improved, but measurement precision and communication performance deteriorate
Solution Approach 1:
The patent implements feedback by establishing a clear mechanism where the base station configures reference configurations and the terminal device provides CSI reports based on valid downlink subframes determined from these configurations. This feedback loop ensures that channel state information is accurately measured and reported, maintaining measurement precision while preserving traffic adaptation flexibility.
Data Source
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AI summary
A subframe in a certain cell that satisfies criteria which includes at least a criterion (i) is regarded as being valid as a CSI reference resource. In a case where, in the criterion (i), information which is signaled on a PDCCH and that indicates an UL-DL configuration for a cell is detected, the UL-DL configuration for the cell is given by the information. In a case where, in the criterion (i), the information is not detected, the UL-DL configuration for the cell is same as an UL-DL configuration that is indicated by a higher layer parameter. The criterion (i) stipulates that, in a case where multiple cells with different UL-DL configurations are aggregated and the terminal device is not capable of simultaneous reception and transmission in the multiple cells, a subframe in a primary cell is a DL subframe or a special subframe that is indicated by an UL-DL configuration for the primary cell.