Radio Transmitting Apparatus Search Space Subsets for Blind Decoding Reduction
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Solution Overview
Problem
In LTE systems, the number of blind decoding attempts by terminals increases with the need to monitor multiple DCI formats for dynamic switching in MIMO and CoMP transmissions, leading to higher terminal complexity, power consumption, and increased false alarm rates, which can deteriorate system throughput.
Innovation Solution
A radio transmitting apparatus and method that divides the search space into subsets and allocates different subsets to submodes, reducing the number of blind decoding attempts without increasing the allocation block rate by limiting blind decoding candidates based on transmission modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple DCI formats are monitored for dynamic switching in MIMO and CoMP transmissions, then transmission flexibility and adaptability are improved, but terminal complexity and power consumption increase
Solution Approach 1:
The search space is divided into multiple subsets, and the terminal is configured to monitor only a specific subset based on its transmission mode. This segmentation reduces the number of blind decoding attempts from the full search space to a manageable subset, thereby reducing terminal complexity and power consumption while maintaining transmission flexibility through proper subset configuration.
2Device complexity
If the search space is reduced to decrease blind decoding attempts, then terminal complexity is reduced, but control signal allocation efficiency deteriorates
Solution Approach 1:
The invention dynamically configures the search space subset for each terminal based on its transmission mode (MIMO or CoMP). This dynamic configuration ensures that terminals monitor only the necessary subset for their specific mode, reducing complexity while maintaining adequate control signal allocation efficiency through mode-specific optimization rather than uniform reduction.
Data Source
AI summary
Provided are a radio transmitting apparatus and a control signal transmitting method whereby the number of blind decodings on a control signal receiving side can be reduced without increasing the control signal allocation block rate. In a base station (100), a search space establishing unit (103) establishes two subsets into which a UE-SS established in a second transmission mode different from a first transmission mode has been divided and the number of which is the same as the number of the sub-modes of the first transmission mode, and an allocating unit (106) allocates the mutually different subsets to those two respective sub-modes. Each subset has a plurality of downstream control information allocation area candidates. In this way, the blind decoding area candidates related to DCI format corresponding to each sub-mode can be limited to the subset corresponding to each sub-mode.