Base Station Control Signal Grouping for MTC Blind Decoding Load
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Solution Overview
Problem
The increasing number of MTC terminals in each cell leads to a higher load for base stations in managing and controlling PDCCH, particularly due to the broader range of blind decoding required, which is problematic especially for MTC terminals needing extra-low power consumption.
Innovation Solution
A base station system that transmits control signals with reference information identified by a group identifier, allowing multiple radio terminals to share a reference region in the data region, reducing the load of blind decoding by aggregating resource information for multiple terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of MTC terminals in each cell increases, then the coverage and connectivity are improved, but the load of blind decoding in the radio terminal increases
Solution Approach 1:
The invention divides the control region into multiple search spaces (common search space and UE-specific search space) and further segments the blind decoding process by introducing group identifiers. This segmentation allows terminals to focus their blind decoding efforts on specific regions and groups, reducing the overall complexity proportional to the number of terminals.
Solution Approach 2:
The invention introduces a new dimension of grouping by group identifiers in addition to the traditional UE-specific identification. This adds a hierarchical structure where terminals first identify their group and then perform blind decoding within that group's allocated resources, effectively reducing the search space from O(N) to O(N/G) where G is the number of groups.
2Quantity of substance
If the number of MTC terminals in each cell increases, then the network capacity is improved, but the power consumption of radio terminals increases
Solution Approach 1:
By segmenting the control region and introducing group-based search spaces, the invention reduces the number of blind decoding attempts required. Since blind decoding is a power-intensive operation, reducing its load directly decreases power consumption while maintaining support for a larger number of terminals.
Solution Approach 2:
The invention implements partial action by having terminals perform blind decoding only on relevant portions of the control region (their assigned group's search space) rather than the entire control region. This partial processing significantly reduces computational effort and power consumption.
3Quantity of substance
If the number of MTC terminals in each cell increases, then the system coverage is improved, but the complexity of resource allocation in the PDCCH increases
Solution Approach 1:
The invention segments the PDCCH resource allocation into group-based search spaces, where each group is assigned specific CCE (Control Channel Element) ranges. This segmentation simplifies the base station's resource allocation task by providing a structured framework that scales with the number of terminals.
Solution Approach 2:
The invention merges multiple UE-specific resources into group-based search spaces, where terminals with the same group identifier share the same search space configuration. This merging reduces the overall complexity of resource management while maintaining individual terminal identification through UE-specific parameters within the group.
Data Source
AI summary
Provided is a base station including a transmitter section that transmits a radio signal in a frame including a control region and a data region, a control signal generating section that generates a control signal which includes reference information identified by a group identifier assigned to a plurality of radio terminals and which is transmitted in the control region, and a data signal generating section that generates a data signal by disposing information for the plurality of radio terminals in a reference region indicated by the reference information in the data region.