PDCCH Search Space Segmentation for Lower UE Monitoring Power
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Solution Overview
Problem
The high power consumption of user equipment (UE) for control channel monitoring due to blind detection across all search spaces in the New Radio (NR) standard is not efficiently addressed, leading to inefficient energy usage.
Innovation Solution
Scrambling downlink control information (DCI) with a predefined terminal identifier to indicate a designated set of control channels for decoding, reducing the range of blind detection and implicitly indicating a reduced set of control channels for UE monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs blind detection on the PDCCH from all search spaces, then the UE can obtain DCI for scheduling authorization and allocation, but the power consumption for control channel monitoring on the UE side is high
Solution Approach 1:
The patent segments the search space into multiple subsets (first search space subset and second search space subset) and assigns different DCI formats to different subsets. The UE only needs to perform blind detection on the relevant subset based on the DCI format, rather than searching all search spaces, thereby reducing power consumption while maintaining reliable DCI reception.
Solution Approach 2:
The patent applies local quality by configuring different search space subsets with different properties (first subset for format 0_0/1_0, second subset for format 0_1/11). The UE adapts its detection behavior locally based on the specific DCI format requirement, optimizing the balance between detection capability and power consumption for each local case.
2Loss of information
If the UE performs blind detection across all search spaces, then comprehensive control information can be received, but the range of blind detection is large leading to inefficient energy usage
Solution Approach 1:
The patent divides the search space into segmented subsets where each subset is associated with specific DCI formats. This segmentation allows the UE to limit blind detection to only the necessary subset based on the required DCI format, ensuring complete reception of needed control information while avoiding unnecessary detection in other subsets, thus improving energy efficiency.
Solution Approach 2:
The patent implements partial action by having the UE perform blind detection only on the relevant search space subset rather than all subsets. The UE performs detection partially (only where needed) based on the DCI format indication, avoiding excessive detection actions in unrelated search spaces, thereby reducing energy consumption without losing necessary control information.
3Device complexity
If the search space is introduced to limit blind decoding attempts, then the maximum number of blind decoding attempts is limited, but the UE still performs blind detect on all search spaces resulting in high power consumption
Solution Approach 1:
The patent further segments the already-limited search space into subsets based on DCI format requirements. Even though the search space concept limits the total number of blind decoding attempts, the patent's segmentation allows the UE to focus only on relevant subsets, reducing the actual power consumption for control channel monitoring while maintaining the complexity benefits of the search space framework.
Data Source
AI summary
The present disclosure relates to a method for wireless communication, and an electronic device and a computer-readable storage medium. The electronic device according to the present disclosure comprises a processing circuit, the processing circuit being configured to: scramble first downlink control information (DCI) by using a predefined terminal identifier, so as to instruct a terminal device to decode second DCI in a set of specified control channels; and send the scrambled first DCI to the terminal device.