PDCCH Resource Configuration for Reduced-Capability UEs
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Solution Overview
Problem
Existing wireless communication systems struggle to support user equipment (UE) with reduced capabilities, such as limited bandwidth, low complexity, and reduced number of antennas, leading to inadequate scheduling and performance of physical downlink control channels.
Innovation Solution
The UE transmits a capability message indicating its type, allowing the base station to select an appropriate control resource set based on reduced capabilities, enhancing PDCCH link performance for UEs like NR-Light devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard control resource set is used for all UEs, then system complexity is kept simple, but PDCCH link performance deteriorates for reduced capability UEs with limited bandwidth and fewer antennas
Solution Approach 1:
The control resource set configurations are segmented into different types (first type for reduced capability UEs, second type for other UEs) based on UE capabilities. The base station selects appropriate control resource set types and parameters according to the UE's bandwidth and antenna capabilities, thereby optimizing PDCCH performance for each UE category without requiring a single complex configuration for all UEs.
Solution Approach 2:
The control resource set parameters are made dynamic and adaptable to individual UE capabilities. The base station determines control resource set type and parameters based on received UE capability information, allowing the system to dynamically adjust control channel资源配置 to match each UE's specific bandwidth and antenna constraints, thus improving reliability without permanent system complexity.
2Reliability
If control resource set parameters are optimized for reduced capability UEs, then PDCCH link performance improves, but the scheduling complexity for the base station increases
Solution Approach 1:
The invention changes key control resource set parameters (such as frequency domain allocation, time domain allocation, and resource element patterns) specifically for reduced capability UEs. By adjusting these parameters based on UE capability indicators, the base station optimizes control channel performance for bandwidth-limited and antenna-reduced UEs while managing scheduling complexity through capability-based classification.
Solution Approach 2:
Different control resource set configurations are applied locally to different UE types based on their specific capabilities. Reduced capability UEs receive specialized control resource set parameters tailored to their bandwidth and antenna constraints, while other UEs continue to use standard configurations. This localized optimization improves performance for target UEs without unnecessarily complicating scheduling for all UEs.
3Productivity
If the base station uses a fixed control resource set configuration, then implementation is simple, but resource allocation efficiency deteriorates for UEs with reduced bandwidth
Solution Approach 1:
The UE provides capability information (bandwidth capability, antenna count) in advance before normal data transmission. The base station uses this preliminary information to pre-determine the appropriate control resource set type and parameters before scheduling control channels. This preliminary action enables efficient resource allocation for bandwidth-reduced UEs without requiring complex real-time adjustments during scheduling.
Solution Approach 2:
The base station changes control resource set parameters (frequency domain allocation, time domain allocation, resource element patterns) based on UE capability parameters. For UEs with reduced bandwidth, the control resource set is configured with appropriate frequency and time domain allocations that match their capabilities, thereby improving resource allocation efficiency while managing configuration complexity through parameter adaptation.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit a UE capability message to a base station, the UE capability message including an indication of a UE type, the UE type associated with at least one of a reduced bandwidth, or a reduced number of antennas, or a combination thereof, for the UE. The UE may monitor, based at least in part on a control resource set that is based at least in part on the UE type, a control channel for a downlink grant for downlink resources. The UE may receive, based at least in part on the monitoring, a grant identifying the downlink resources for communicating with the base station. The UE may communicate with the base station using the identified downlink resources.