User Terminal Control Resource Set Allocation for 5G
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Solution Overview
Problem
Future radio communication systems, such as LTE Rel. 14, 15, and 5G, face challenges in appropriately communicating control channels due to different configurations from legacy LTE systems, particularly in supporting flexible numerologies and dynamic frame configurations, which can lead to inadequate communication performance.
Innovation Solution
A user terminal and radio communication method that dynamically configure control resource sets with varying monitoring periodicities, allowing the number of downlink control channel candidates to be allocated optimally across these sets, ensuring it does not exceed the terminal's capability, thereby enabling effective communication even with different control channel configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user terminal monitors all downlink control channel candidates in all control resource sets, then the control channel communication reliability is improved, but the power consumption increases and operation failures occur due to excessive blind decoding
Solution Approach 1:
The patent divides control resource sets into multiple groups and segments the monitoring task by selecting specific control resource sets based on monitoring indications received from the base station. This segmentation allows the terminal to monitor only a subset of control resource sets at each monitoring occasion, reducing power consumption while maintaining reliable control channel communication through selective monitoring.
2Reliability
If the user terminal monitors all downlink control channel candidates in all control resource sets, then the control channel communication reliability is improved, but operation failures occur due to excessive blind decoding
Solution Approach 1:
The patent segments the control resource sets into multiple groups and implements selective monitoring based on monitoring indications. By processing only a subset of control resource sets at each monitoring occasion rather than all sets simultaneously, the terminal avoids operation failures due to excessive blind decoding while maintaining control channel communication reliability through the segmented monitoring approach.
3Adaptability or versatility
If the control resource set configuration follows legacy LTE systems, then the system compatibility is improved, but the adaptability to future radio communication systems with different numerologies and dynamic frame configurations deteriorates
Solution Approach 1:
The patent implements dynamic control resource set configurations that can adapt to future radio communication systems with different numerologies and frame structures. The control resource sets are configured with flexible parameters including monitoring periodicities and associations with downlink and uplink channels, allowing the system to dynamically adjust to different numerologies and dynamic frame configurations while managing complexity through standardized configuration mechanisms.
4Adaptability or versatility
If multiple control resource sets with different monitoring periodicities are configured, then the scheduling flexibility is improved, but the device complexity increases
Solution Approach 1:
The patent segments control resource sets into multiple groups with different monitoring periodicities (e.g., first group with first periodicity, second group with second periodicity). This segmentation enables flexible scheduling by allowing different monitoring behaviors for different control resource sets while managing device complexity through organized group management and standardized monitoring procedures for each group.
Solution Approach 2:
The patent implements periodic monitoring of control resource sets with different monitoring periodicities. The terminal monitors control resource sets in the first group at a first monitoring periodicity and control resource sets in the second group at a second monitoring periodicity. This periodic action approach provides scheduling flexibility by allowing different update rates for different control resource sets while managing complexity through systematic periodic monitoring patterns.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
To appropriately communicate a control channel even when communication is performed by applying a different control channel configuration from those of legacy LTE systems, one aspect of the user terminal includes: a reception section that receives a downlink control channel transmitted by each of a plurality of control resource sets; and a control section that controls monitoring of a downlink control channel candidate, and the control section performs control to allocate a number of downlink control channel candidates to each control resource set such that the number of downlink control channel candidates does not exceed a predetermined value per combination of the control resource sets in a predetermined time unit.