Search Space Set Group Switching for DRX PDCCH Power Savings
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Solution Overview
Problem
Existing 5G wireless communication systems face challenges in efficiently managing search space set group switching during discontinuous reception (DRX) in the RRC_CONNECTED state, leading to unnecessary PDCCH monitoring and increased power consumption in user equipment (UEs).
Innovation Solution
Implementing search space set group (SSSG) switching enhancements by utilizing a PDCCH monitoring adaptation field with two or more bits to indicate switching to a search space set group or skipping reception of PDCCHs, along with a time duration, to optimize PDCCH monitoring based on DCI formats and RNTIs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously monitors PDCCH in RRC_CONNECTED state during DRX, then service quality is maintained, but power consumption increases
Solution Approach 1:
The patent implements dynamic search space set group switching where the UE can switch between first search space set groups (with more PDCCH monitoring) and second search space set groups (with less PDCCH monitoring) based on traffic conditions and network instructions. This dynamic adaptation allows the system to adjust monitoring intensity from aggressive to relaxed modes, resolving the contradiction between maintaining service quality and reducing power consumption during DRX operations
Solution Approach 2:
The patent changes the parameter of search space set group configuration to control PDCCH monitoring behavior. By receiving indications from the network to switch between different search space set groups with different monitoring characteristics, the UE can adjust its monitoring parameters to balance service quality and power consumption requirements
2Use of energy by moving object
If the UE switches between multiple search space set groups, then power savings are achieved, but device complexity increases
Solution Approach 1:
The patent segments the search space sets into multiple search space set groups (first search space set groups and second search space set groups) with different monitoring characteristics. This segmentation allows the UE to selectively activate appropriate groups based on conditions, achieving power savings while managing complexity through organized group structures rather than unmanageable individual search space configurations
3Use of energy by moving object
If the UE monitors PDCCH with relaxed monitoring, then power consumption decreases, but service quality may be compromised
Solution Approach 1:
The patent implements dynamic switching between relaxed and aggressive PDCCH monitoring modes through search space set group transitions. The UE can operate in relaxed monitoring mode to save power during periods of low activity, while the ability to quickly switch to aggressive monitoring mode ensures service quality is maintained when needed, resolving the contradiction between power consumption and service quality
Data Source
AI summary
Methods and apparatuses for search space set group switching. A method for operating a user equipment includes receiving information for search space set groups and a first physical downlink control channel (PDCCH) that provides a downlink control information (DCI) format that includes a PDCCH monitoring adaptation field of two or more bits. The method further includes determining that a first bit of the PDCCH monitoring adaptation field indicates switching to the search space set group or skipping reception of second PDCCHs and determining that remaining bits of the PDCCH monitoring adaptation field indicate a group index for a search space set group nSSSG or a time duration Tskip. The method further includes receiving the third PDCCHs according to search space sets included in the search space set group nSSSG or skipping the reception of PDCCHs for the time duration Tskip.