CORESET Configuration with Reduced RB Groups for Low-Complexity UEs
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Solution Overview
Problem
Low complexity user equipment (UE) experiences reduced performance due to high resource block (RB) groups in control resource sets (CORESETs), even if the number of RB groups complies with network limits, and may not support limitations for CORESETs associated with narrowband reference signals, leading to delays, increased power consumption, and performance degradation.
Innovation Solution
A base station configures a reduced complexity CORESET for low complexity UEs by limiting the number of RB groups and avoiding multiplexing with other signals, allowing these UEs to suppress decoding if the configured CORESET does not meet the reduced complexity criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station configures a CORESET with a large number of RB groups to comply with network limits, then the network resource utilization is improved, but the low complexity UE experiences increased decoding complexity and reduced performance
Solution Approach 1:
The patent segments the CORESET configuration into two distinct types: a first CORESET configuration for low complexity UEs with limited RB groups, and a second CORESET configuration for other UEs that can handle larger RB groups. This segmentation allows the network to optimize resource utilization overall while protecting low complexity UEs from excessive decoding complexity.
Solution Approach 2:
The patent applies local quality by providing different CORESET configurations tailored to specific UE capabilities. Low complexity UEs receive a specialized configuration with fewer RB groups suited to their processing limitations, while other UEs receive the standard configuration that maximizes network resource utilization. Each UE type gets the appropriate quality of service matching its capabilities.
2Device complexity
If the base station limits the number of RB groups in a CORESET for low complexity UEs, then the UE decoding complexity is reduced, but the network resource utilization decreases
Solution Approach 1:
The patent creates a universal system that supports multiple UE types through different CORESET configurations. The network can simultaneously maintain a first CORESET for low complexity UEs and a second CORESET for other UEs, allowing the system to serve diverse device capabilities while optimizing overall resource utilization across the network.
Solution Approach 2:
The patent changes the RB group parameter differently for different UE types. For low complexity UEs, the RB group parameter is reduced to match their processing capabilities. For other UEs, the standard parameter settings are maintained, allowing full network resource utilization. This parameter differentiation resolves the contradiction between UE capability and network efficiency.
3Reliability
If the low complexity UE monitors a CORESET with many RB groups, then the control channel coverage is improved, but the UE power consumption increases
Solution Approach 1:
The patent segments the monitoring requirements by creating a first CORESET configuration specifically for low complexity UEs with reduced RB groups. This segmentation allows these UEs to monitor control channels with lower power consumption while maintaining adequate coverage through the tailored configuration, rather than forcing them to monitor full-sized CORESETs that would drain their limited power resources.
4Use of energy by moving object
If the low complexity UE suppresses decoding on a non-reduced complexity CORESET, then the UE power consumption is reduced, but the control information reception reliability decreases
Solution Approach 1:
The patent applies preliminary action by pre-configuring a first CORESET with reduced RB groups that is specifically suited for low complexity UEs. This preliminary configuration ensures that these UEs have an appropriate monitoring target from the outset, eliminating the need to suppress decoding and ensuring reliable control information reception while maintaining low power consumption. The configuration is established before the UE needs to monitor, preventing the contradiction from arising.
Data Source
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Figure 3A~3B
AI summary
Methods, systems, and devices for wireless communications are described to support complexity reduction for a control resource set (CORESET). A low complexity user equipment (UE) may experience reduced performance if a number of resource block (RB) groups in a CORESET is above a given threshold, or if any symbols of a CORESET are multiplexed with any other signal or channel. A base station may configure a CORESET for a low complexity UE to support reduction in complexity of information detection compared with a CORESET configured for other UEs. The configured CORESET may be based on one or more capabilities of a low complexity UE and may include a reduced number of RB groups or may avoid overlapping with any other signal or channel. If a CORESET configured for a low complexity UE is does not support complexity reduction, the UE may suppress decoding search space candidates on the CORESET.