CSI Reporting with Power Offsets for Link Adaptation
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Solution Overview
Problem
In communication systems, reducing network device energy consumption through power adjustments affects the accuracy of link adaptation due to mismatched channel state information (CSI) reporting, leading to performance degradation.
Innovation Solution
A method involving a terminal device receiving multiple power offset values from a network device to determine and report a subset of CSI, ensuring flexibility and consistency, thereby reducing measurement complexity and resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the network device reduces transmit power for data transmission to reduce energy consumption, then energy consumption is reduced, but the accuracy of link adaptation deteriorates because the terminal device cannot report accurate CSI based on the power offset value
Solution Approach 1:
The patent introduces dynamic power offset values that can be adjusted based on actual transmission conditions. The network device determines multiple power offset values and indicates them to the terminal device, allowing the system to adapt dynamically between energy saving mode and accurate CSI reporting mode, resolving the contradiction between reducing energy consumption and maintaining measurement precision.
Solution Approach 2:
The patent changes the parameter of power offset value from a single static value to multiple adjustable values. By indicating different power offset values to the terminal device based on actual transmission power adjustments, the system ensures that CSI reporting remains accurate even when transmit power is reduced for energy saving, thus resolving the contradiction between energy consumption and measurement accuracy.
2Measurement precision
If the terminal device determines multiple pieces of CSI based on multiple power offset values, then the accuracy of link adaptation is improved, but the measurement complexity and reporting overhead increase
Solution Approach 1:
The patent extracts only the necessary CSI pieces from the full set of M pieces. The network device indicates N power offset values (where N < M) to the terminal device, so the terminal device only needs to determine and report N pieces of CSI corresponding to these indicated power offset values, rather than all M pieces. This reduces measurement complexity and reporting overhead while maintaining sufficient accuracy for link adaptation.
Solution Approach 2:
The patent applies partial action by having the terminal device determine all M pieces of CSI internally but only report N pieces (where N < M) to the network device. The network device uses these N reported pieces along with the indicated power offset values to achieve accurate link adaptation, avoiding the excessive overhead of reporting all M pieces while maintaining sufficient precision.
3Measurement precision
If the terminal device reports all M pieces of CSI to the network device, then the accuracy of link adaptation is maximized, but the reporting resources and overhead are excessive
Solution Approach 1:
The patent extracts and reports only the essential N pieces of CSI out of M total pieces. The network device indicates which N power offset values are relevant for current transmission, and the terminal device reports only the corresponding N CSI pieces. This extraction approach reduces reporting resources and overhead significantly while maintaining the accuracy needed for effective link adaptation.
Solution Approach 2:
The terminal device performs the action of determining all M pieces of CSI internally but only executes the reporting action for N pieces (where N < M). This partial reporting strategy provides sufficient information for the network device to perform accurate link adaptation without consuming excessive reporting resources, effectively balancing precision and resource efficiency.
Data Source
AI summary
Embodiments of this application provide a communication method and a related device. The method includes: A terminal device obtains a plurality of power offset values corresponding to one reference signal resource, determines a plurality of pieces of channel state information CSI based on the plurality of offset values, and sends some or all of the plurality of pieces of CSI to a network device. The network device may flexibly adjust data transmit power based on the plurality of power offset values and the plurality of pieces of corresponding CSI, and perform appropriate link adaptation adjustment.