Common Search Space Segmentation for MTC Radio Resource Efficiency
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Solution Overview
Problem
In Machine Type Communication (MTC) systems, MTC UEs with varying coverage enhancement levels within a cell inefficiently use radio resources due to repetitive transmissions of common control information through a single Common Search Space (CSS), leading to wastage of radio resources.
Innovation Solution
Configuring a separate Common Search Space for each type of common control information and coverage enhancement level within a cell, allowing MTC UEs to monitor and receive control information specifically tailored to their requirements, thereby optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single Common Search Space is configured for all MTC UEs with various coverage enhancement levels, then device complexity is reduced and ease of operation is improved, but radio resource efficiency deteriorates due to repetitive transmissions
Solution Approach 1:
The patent divides the single Common Search Space into multiple separate Common Search Spaces, each configured for specific coverage enhancement levels. This segmentation allows UEs to monitor only the CSS relevant to their coverage level, eliminating repetitive transmissions of common control information across all UEs and improving radio resource efficiency while maintaining configuration simplicity through standardized segmentation rules
2Reliability
If repetitive transmissions of common control information are performed through a single Common Search Space, then reliability is improved for UEs in bad propagation environments, but radio resource waste increases
Solution Approach 1:
The patent applies local quality by configuring different Common Search Spaces with specific properties tailored to different coverage enhancement levels. Each CSS is optimized for its target UE group's propagation conditions, ensuring reliable control information reception for UEs in bad environments while avoiding unnecessary repetitions for UEs with better coverage, thus eliminating radio resource waste
3Loss of energy
If separate Common Search Spaces are configured for each coverage enhancement level, then radio resource efficiency is improved, but device complexity and configuration complexity increase
Solution Approach 1:
The patent manages configuration complexity by systematically varying parameters (such as monitoring occasions, frequency locations, and resource allocations) across different Common Search Spaces based on coverage enhancement levels. This parameter-based differentiation allows efficient resource utilization while maintaining manageable configuration complexity through standardized parameter sets and systematic variation rules
Data Source
AI summary
Provided are a method and a device for configuring a common search space (CSS) for a user equipment supporting a coverage enhancement operation or a low complexity user equipment (UE) category/type for a machine type communication (MTC) operation. The method may include monitoring a common search space configured according to types of common control information; and receiving the common control information transmitted through the common search space.