Reference Signal Control Information Transmission
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Solution Overview
Problem
In LTE wireless communication systems, the transmission of reference signals occupies physical resources, reducing spectral efficiency, and there is a need to balance reference signal density with channel estimation precision and control information transmission efficiency.
Innovation Solution
Implementing low bit rate coding and/or low order modulation on control information data and transmitting it on partial physical resources of the reference signal, while ensuring the coding and modulation rates are compatible with nearby user data, and selecting appropriate transmission modes based on signal-to-noise ratio and coherence conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signal with high density is used, then channel estimation precision is improved, but physical resource utilization deteriorates
Solution Approach 1:
The patent applies multi-functionality by enabling reference signal resources to serve dual purposes: traditional channel estimation and control information transmission. The sending end transmits both reference signal data and control information on the same physical resources, allowing the receiving end to perform both channel estimation and control information demodulation, thereby improving resource utilization without compromising channel estimation precision
Solution Approach 2:
The patent merges the transmission of reference signals and control information into the same physical resources. By superimposing control information onto reference signal resources through specific mapping relationships, the system combines two separate transmission functions into one, reducing overall resource consumption while maintaining the precision of channel estimation
2Productivity
If control information is transmitted using normal coding and modulation rates, then transmission efficiency is improved, but compatibility with nearby user data deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the coding and modulation requirements for control information versus user data. Control information transmitted on reference signal resources uses specific coding rates and modulation orders that are adapted to the local characteristics of reference signal transmission, while user data maintains its own optimization, allowing each to operate at peak efficiency in its respective context
Solution Approach 2:
The patent changes the parameters of coding rate and modulation order for control information transmission. By adjusting these parameters to be lower than or equal to those of nearby user data, the system ensures that control information can be reliably decoded even under varying channel conditions, while still achieving efficient transmission through the shared reference signal resources
3Reliability
If more control information is transmitted, then system performance is improved, but physical resource occupation deteriorates
Solution Approach 1:
The patent enables reference signal resources to perform multiple functions simultaneously: channel estimation and control information transmission. By configuring the system to transmit control information on reference signal resources, the same physical resources serve dual purposes, allowing more control information to be transmitted without proportionally increasing resource occupation
Solution Approach 2:
The patent introduces a new dimension of resource utilization by overlaying control information transmission on top of reference signal resources in the time-frequency domain. This dimensional approach allows control information to be embedded within existing reference signal structures, effectively adding capacity without linearly increasing resource consumption
Data Source
AI summary
A method for transmitting control information, a channel or signal, and a corresponding sending end are provided. The method includes: after performing low bit rate coding and/or low order modulation on data containing the control information, carrying the data on partial physical resources of a reference signal for transmission, herein the coding rate is lower than the highest coding rate set by the system and the modulation order is lower than the highest modulation order set by the system. The method further includes: selecting one transmission mode from multiple transmission modes configured for the channel or signal; transmitting known data; transmitting non-known data and being subject to a coding limitation and/or modulation limitation; and transmitting the non-known data and not being subject to the modulation limitation and the coding limitation; and sending transmission mode configuration information to a receiving end to indicate the selected transmission mode.