Relay Node Channel Status Feedback via Subframe Indexing
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Solution Overview
Problem
In wireless communication systems with relay nodes, there is a limitation in uplink resource assignment, particularly in transmitting channel status information, which hinders correct feedback and subsequent downlink transmission performance.
Innovation Solution
A method is introduced where channel status information is transmitted through specific uplink subframes, determined by subframe indexes and timing relations relative to designated downlink subframes, using either Frequency Division Duplex (FDD) or Time Division Duplex (TDD) modes, ensuring correct feedback even with limited uplink resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uplink resource assignment is limited in relay node systems, then device complexity and resource allocation difficulty are reduced, but channel status information feedback reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring the mapping relationship between downlink subframes and uplink subframes for channel status information feedback. The eNodeB determines in advance which uplink subframe corresponds to which downlink subframe based on predetermined timing relations, allowing the relay node to transmit feedback without real-time resource selection, thus maintaining reliability while simplifying complexity
Solution Approach 2:
The patent implements feedback mechanisms where the relay node transmits channel status information from downlink subframes to the eNodeB through designated uplink subframes. This feedback loop enables the eNodeB to adjust downlink transmission parameters based on channel conditions, ensuring reliable communication despite limited uplink resources through the mechanism of information feedback
2Measurement precision
If channel status information is transmitted in specific uplink subframes, then feedback timing precision is improved, but transmission time flexibility is reduced
Solution Approach 1:
The patent segments the uplink transmission time into specific designated subframes for channel status information feedback. By dividing the time domain into discrete feedback opportunities synchronized with downlink subframes, the system achieves precise timing for feedback while the segmentation allows flexible scheduling within each segment, resolving the contradiction between precision and flexibility
Data Source
AI summary
The present invention relates to a wireless communication system, and more particularly, to a channel status information feedback method and apparatus in a wireless communication system with a relay station. The method for transmitting channel status information according to one embodiment of the present invention comprises: receiving a backhaul downlink signal from a base station; generating channel status information based on the backhaul downlink signal; and transmitting the channel status information via a backhaul uplink subframe, wherein the backhaul uplink subframe to which the channel status information is transmitted can be determined based on a subframe index without a designated backhaul downlink subframe and a backhaul uplink transmission timing relation.