PDCCH CORESET Suspension for Radar Interference
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Solution Overview
Problem
5G wireless networks face interference issues when coexisting with high-power narrowband interferers like radars, leading to unreliable reception of downlink control information (DCI) due to overlapping frequency bands, which affects the reliability and efficiency of DCI transmission and reception.
Innovation Solution
The implementation of multiple physical downlink control channel (PDCCH) search space groups, enhanced PDCCH aggregation levels, dynamic switching between semi-persistent and dynamic scheduling, and dynamic suspension of PDCCH CORSETS to mitigate interference from radars, ensuring robust and efficient DCI transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PDCCH resources are used in overlapping frequency bands with radar, then spectrum utilization is improved, but reception reliability of downlink control information deteriorates
Solution Approach 1:
The PDCCH search space is divided into multiple groups (first search space group and second search space group) with different monitoring configurations. The WTRU can switch between groups based on radar interference conditions, allowing the system to maintain spectrum utilization while ensuring reliable DCI reception by selecting appropriate search space groups when interference is detected
Solution Approach 2:
The patent implements dynamic switching between semi-persistent and dynamic scheduling based on radar interference conditions. The network can dynamically adjust the scheduling mode and search space group configuration in response to changing interference environments, optimizing both spectrum utilization and reception reliability in real-time
2Reliability
If PDCCH transmission power is increased to overcome radar interference, then reception reliability is improved, but interference to proximate radar systems worsens
Solution Approach 1:
The patent introduces search space group switching as an intermediary mechanism between PDCCH transmission and radar interference. Instead of directly increasing transmission power, the system uses search space group configuration and switching to route DCI transmissions through less interfered frequency resources, thereby maintaining reception reliability without exacerbating radar interference
Solution Approach 2:
The network dynamically changes PDCCH transmission parameters including search space group configuration, monitoring periodicity, and frequency resource allocation based on radar interference conditions. This allows the system to adapt transmission characteristics to avoid radar frequencies while maintaining reliable DCI reception
3Reliability
If multiple PDCCH search space groups are configured to mitigate radar interference, then reception reliability is improved, but device complexity increases
Solution Approach 1:
The search space is segmented into multiple groups with distinct monitoring configurations, allowing the WTRU to selectively activate appropriate groups based on interference conditions. This segmentation enables reliable DCI reception without requiring the device to continuously process all possible configurations, thereby managing complexity through conditional activation
Solution Approach 2:
The WTRU autonomously switches between search space groups based on detected radar interference conditions without requiring complex network control signaling for each switch. The device self-manages the complexity by independently selecting appropriate search space groups based on channel conditions
Data Source
AI summary
Methods and devices are disclosed to configure a wireless transmit receive unit (WTRU) with multiple physical downlink control channel (PDCCH) control resource sets (CORESETs) including at least a first PDCCH CORESET identifying first frequency resources of a downlink (DL) bandwidth part (BWP) for detection of downlink control information (DCI) and a second PDCCH CORESET identifying second frequency resources of the DL BWP for detection of DCI. The WTRU monitors one or more search spaces linked to active PDCCH CORSETs for transmissions of DCI. On determination that an interferer may impact PDCCH resources, a network sends, and a WTRU receives, signaling to suspend monitoring of search spaces linked to one of the first PDCCH CORSET or the second PDCCH CORESET for a suspend time period. Upon expiration of the suspend time period or sending/receiving unsuspend signaling, the WTRU resumes monitoring search spaces linked to a previously suspended PDCCH CORESET.