PDCCH Monitoring with Search Space Group Switching and Skipping
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in managing physical downlink control channel (PDCCH) monitoring, particularly in the context of 5G New Radio (5G NR), due to the complexity and resource overhead associated with managing multiple search space set groups (SSSGs) and the lack of effective power-saving mechanisms.
Innovation Solution
Implementing a system where wireless communication devices can dynamically switch between search space set groups (SSSGs) and perform PDCCH skipping based on control information, using power-saving SSSGs with configurable parameters and timers, and adapting PDCCH monitoring according to specific events and conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous PDCCH monitoring is performed, then control channel detection reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) mechanisms where the wireless communication device alternates between active monitoring periods and sleep periods. During DRX active time, the device monitors PDCCH according to configured search space sets, then enters sleep mode to save power. This periodic monitoring approach maintains control channel detection reliability during active periods while significantly reducing power consumption during sleep periods, directly resolving the contradiction between continuous monitoring reliability and power consumption.
Solution Approach 2:
The patent introduces dynamic search space set group switching where the device can switch between different groups of search space sets based on control information received from the network. This dynamic adaptation allows the device to adjust its monitoring behavior according to actual data arrival patterns and network conditions, maintaining reliability when needed while enabling power savings during sparse traffic conditions.
2Reliability
If PDCCH monitoring is performed in all search space sets, then control information detection capability is improved, but data processing efficiency deteriorates
Solution Approach 1:
The patent divides all configured search space sets into multiple search space set groups (SSSGs). Instead of monitoring all search space sets continuously, the device selectively activates specific groups based on control information. This segmentation reduces the number of active monitoring targets from all search space sets to only those in currently active groups, improving data processing efficiency while maintaining control information detection capability through selective group activation.
Solution Approach 2:
The patent changes the monitoring parameters by configuring different search space set groups with different monitoring characteristics (periodicity, offsets, durations). The device dynamically adjusts which groups are active based on traffic conditions and network signaling, changing effective monitoring parameters to optimize the balance between detection capability and processing efficiency for different operational scenarios.
3Adaptability or versatility
If multiple search space set groups are configured, then adaptability to different scenarios is improved, but device complexity increases
Solution Approach 1:
The patent segments search space sets into multiple groups that can be independently configured and activated. Each group can be optimized for specific scenarios (e.g., different periodicities for different traffic types). This segmentation provides adaptability to different scenarios while managing complexity by organizing search space sets into manageable groups that are activated only when needed, rather than maintaining all configurations simultaneously active.
Data Source
AI summary
Systems, methods and devices for control channel monitoring may include a wireless communication device reporting, to a wireless communication node, a plurality of capabilities of the wireless communication device. The wireless communication device may receive, from the wireless communication node, control information. The wireless communication device perform physical downlink control channel (PDCCH) monitoring using a group of search space sets (SSSs) selected from a plurality of search space set groups (SSSGs) or PDCCH skipping using a skipping duration according to the control information. The number of SSSG can be an integer N that is not smaller than 1, or each of the SSSGs can include a number of SSSs that is at least zero and at most equal to a maximum number of SSSs configured in a bandwidth part (BWP). The number of skipping duration values can be an integer M greater than or equal to 0.