Wireless Reference Signal Density Adjustment for MTC Coverage
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Solution Overview
Problem
Current coverage enhancement techniques for Machine-Type Communication (MTC) UEs, such as repetition and reference signal density increase, face challenges in optimizing system performance due to high power consumption and resource occupancy, with limited benefits for UEs with high Signal-to-Noise Ratio (SNR) scenarios and impact on coding rates.
Innovation Solution
A wireless communication method that determines the number of resource elements for transmitting reference signals in a Physical Resource Block (PRB) based on the coverage enhancement level, channel type, and coding rate, optimizing RS density to improve channel estimation and reduce power consumption, while avoiding unnecessary overhead in lower SNR scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reference signal density is increased to improve channel estimation for coverage enhancement, then signal quality improves, but resource occupancy and power consumption increase
Solution Approach 1:
The patent dynamically adjusts the reference signal density parameter based on coverage enhancement level and coding rate conditions. When coverage enhancement level is above a threshold and coding rate is below a threshold, reference signal density is increased; otherwise, it is reduced. This parameter adaptation resolves the contradiction by optimizing signal quality only when necessary for coverage enhancement while avoiding unnecessary power consumption in other scenarios.
2Reliability
If reference signal density is increased to improve channel estimation, then coverage enhancement is achieved, but overhead increases especially in high coding rate scenarios
Solution Approach 1:
The patent implements conditional parameter changes for reference signal density based on coverage enhancement level and coding rate thresholds. By dynamically adjusting reference signal density only when coverage enhancement level exceeds a threshold and coding rate is below a threshold, the system achieves necessary channel estimation improvement while minimizing overhead in high coding rate scenarios where additional reference signals would be unnecessary.
3Reliability
If repetitions are performed multiple times to achieve coverage enhancement, then signal accumulation and power enhancement are achieved, but system resources are occupied for extended periods
Solution Approach 1:
The patent adjusts reference signal density parameter based on coverage enhancement requirements and coding rate conditions. By optimizing reference signal density dynamically, the system can achieve coverage enhancement with fewer repetitions in certain scenarios, thereby reducing resource occupancy time while maintaining the necessary reliability for MTC UEs.
Data Source
AI summary
A wireless communication method includes receiving a reference signal and a data signal, based on a coverage enhancement level represented by a number of transmission repetitions; processing the reference signal and the data signal received by the receiving; setting a number of resource elements for transmitting the reference signal based at least on a channel type; and setting usage of resource elements indicated by a System Information Block (SIB). The reference signal is a Cell-specific Reference Signal (CRS) or a Demodulation Reference Signal (DMRS).