Radio Node Precoder Selection Using Adaptive Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The evaluation of precoders in wireless communication systems is time-consuming and often results in outdated measurements due to rapid changes in radio conditions, leading to performance deterioration and inefficient use of radio resources.
Innovation Solution
A method where a first radio node communicates with a second radio node using a first set of precoders, evaluates their quality, and based on the feedback, identifies a second set of precoders for subsequent data transmission, allowing for adaptive selection and reduction in the number of precoders used, thereby improving efficiency and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional precoder evaluation methods are used with periodic reference signals, then comprehensive channel state information can be obtained, but the measurement time becomes too long and the measurements become outdated due to rapid changes in radio conditions
Solution Approach 1:
The patent applies preliminary action by using data transmissions that are already scheduled for other purposes to carry precoder evaluation. Instead of waiting for periodic reference signals, the system preliminarily uses upcoming data transmissions to evaluate precoders, thus obtaining measurements before the radio conditions change further while avoiding dedicated measurement time.
Solution Approach 2:
The patent implements multi-functionality by making data transmissions serve dual purposes: delivering user data and simultaneously carrying precoder evaluation functionality. The data transmissions are configured with multiple precoders and their quality is measured, allowing the same transmission resource to perform both data delivery and channel state assessment.
2Reliability
If multiple precoders are evaluated using periodic reference signals, then the best precoder can be selected, but radio resources are wasted due to the time required for evaluation and the outdated nature of measurements
Solution Approach 1:
The system performs precoder evaluation in advance using scheduled data transmissions before the actual data transmission occurs. This preliminary evaluation ensures that the precoder selection is based on current channel conditions while the data transmission resources are already allocated, avoiding waste of radio resources.
Solution Approach 2:
The patent maintains continuity of useful action by ensuring that data transmissions continuously serve dual purposes of data delivery and precoder evaluation. Instead of alternating between dedicated measurement phases and data transmission phases, the useful action of data transmission continuously provides precoder evaluation opportunities, maximizing resource utilization.
3Measurement precision
If comprehensive CSI feedback is collected using periodic reference signals, then accurate channel state information is obtained, but the feedback becomes outdated and performance deteriorates in rapidly changing radio conditions
Solution Approach 1:
The system obtains channel state information preliminarily through data transmissions that are scheduled in advance. By evaluating precoders using these pre-configured transmissions, the system ensures that CSI feedback reflects current radio conditions before they change, maintaining both accuracy and reliability simultaneously.
Solution Approach 2:
The patent implements continuous feedback by using each data transmission to generate fresh CSI measurements. The feedback loop is maintained through ongoing evaluation of multiple precoders during scheduled data transmissions, ensuring that the system always has current channel state information to make reliable communication decisions.
Data Source
AI summary
A method and a first radio node (200 or 202), for communicating data with a second radio node in a wireless network using precoders. The first radio node (200 or 202) communicates (2:1) with the second radio node (202 or 200) a first data transmission using a first set of precoders (S1), and communicates (2:4) with the second radio node (202 or 200) a precoder indicator which is based on quality of the communicated first data transmission. The first radio node (200 or 202) identifies (2:5) a second set of precoders (S2) within the first set (S1) based on the communicated precoder indicator, and communicates (2:6) with the second radio node (202 or 200) a second data transmission using the second set of precoders.