Reference Signal Bundling for MTC Channel Estimation
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Solution Overview
Problem
Machine type communication (MTC) devices face challenges in signal reception due to severe channel attenuation, particularly for low-cost user equipment, which affects channel estimation and compatibility with legacy systems.
Innovation Solution
A method for user equipment in wireless communication systems that involves repetitively receiving or transmitting reference signals from multiple resource units, with bundling determined based on repetition count and number of antenna ports, to enhance channel estimation and compatibility with legacy systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If machine type communication devices use low-cost user equipment, then implementation costs are reduced, but channel estimation capability deteriorates due to severe channel attenuation
Solution Approach 1:
The patent combines multiple reference signals from multiple resource units through signal bundling to improve channel estimation. By merging the reference signals received from multiple resource units and assuming the same precoding across them, the system enhances the channel estimation capability for low-cost MTC devices without requiring more complex hardware
Solution Approach 2:
The patent changes the parameter of reference signal repetition count and applies bundling based on the number of antenna ports. By repetitively receiving reference signals from multiple resource units and determining bundling based on repetition count and antenna port configuration, the system adapts channel estimation to different channel conditions while maintaining low-cost device architecture
2Measurement precision
If reference signals are repetitively transmitted from multiple resource units, then channel estimation is improved, but signal transmission complexity increases
Solution Approach 1:
The patent applies the same precoding assumption across multiple resource units for reference signal transmission. This universal approach allows the system to improve channel estimation through multiple resource units while avoiding the complexity of different precoding schemes for each resource unit
Solution Approach 2:
The patent determines bundling based on the repetition count of reference signals and the number of antenna ports. By using these parameters to control when and how bundling is applied, the system manages transmission complexity while achieving improved channel estimation under specific conditions
Data Source
AI summary
Provided are a method for transmitting and receiving signals in a wireless communication system including machine type communication (MTC), and a base station and a terminal therefor. The method for transmitting and receiving signals comprises the steps of: receiving repeatedly reference signals from a plurality of resource units; determining whether to perform bundling for the reference signals transmitted from at least one resource unit among the plurality of resource units; and, when it has been decided to perform bundling, estimating a channel by assuming the same precoding for the reference signals transmitted from the at least one resource unit. Whether to perform bundling is determined on the basis of the number of repetition of the reference signals and/or the number of antenna ports.