UE Reference Slot Length for Multi-Cell CSI Scheduling
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Solution Overview
Problem
In 5G NR networks, when aperiodic CSI reporting/CSI-RS is transmitted between a UE and multiple cells with different numerologies, existing constraints for downlink and uplink CSI requests/reports are not adequately addressed, leading to potential overloading and misalignment of slot lengths.
Innovation Solution
The UE determines a reference slot length based on the sub-carrier spacing of the first cell it connects to, aligning it with the slot of the specific cell for PDCCH or PUSCH to ensure that only one CSI request/report is processed within that slot, thereby managing CSI requests and reports effectively across cells with different numerologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE connects to multiple cells with different numerologies for aperiodic CSI reporting, then the network can provide more flexible scheduling and faster data transmission, but the slot length alignment and CSI request constraints become complex and prone to overload
Solution Approach 1:
The patent introduces a reference slot length parameter that is determined based on the sub-carrier spacing of a first cell. This parameter serves as a common reference for aligning slots across multiple cells with different numerologies. By changing the parameter space to include a reference slot length, the system can manage complexity while maintaining flexibility in multi-cell scheduling.
Solution Approach 2:
The patent segments the CSI request handling by cell group and slot. It defines specific constraints for downlink and uplink CSI requests separately, and introduces a mechanism to count and limit CSI requests per slot within each cell group. This segmentation allows the system to manage complexity by treating different cell groups and slots independently while maintaining overall flexibility.
2Productivity
If the UE receives multiple downlink control information with non-zero CSI request per slot in a cell group, then more CSI reporting can be performed, but the UE processing load increases and constraints are violated
Solution Approach 1:
The patent performs preliminary counting and validation of CSI requests before processing. It defines a counter mechanism that tracks the number of CSI requests received in each slot, and uses this count to determine whether to process additional CSI requests. This preliminary action ensures constraint compliance while maximizing productivity by allowing multiple CSI reports when within limits.
Solution Approach 2:
The patent introduces dynamic constraints that can change based on the current slot and cell group configuration. The maximum number of CSI requests per slot is not fixed but can vary based on the reference slot length and cell group characteristics. This dynamic approach allows the system to adapt to different operational conditions while maintaining reliability through enforced constraints.
3Adaptability or versatility
If the triggering PDCCH and CSI-RS have different numerologies, then the system can utilize diverse numerologies for optimized performance, but the existing CSI request constraints cannot be directly applied
Solution Approach 1:
The patent introduces a reference slot length as an intermediary parameter that bridges different numerologies. Instead of directly applying constraints to each cell's native slot length, the system uses the reference slot length (determined from the first cell's sub-carrier spacing) as a common mediator to translate and compare slot durations across cells with different numerologies. This intermediary simplifies constraint application while maintaining multi-numerology support.
Solution Approach 2:
The patent changes the parameter space by introducing a reference slot length that is independent of individual cell numerologies. This parameter transformation allows the system to maintain simple, uniform constraints while supporting diverse numerologies. The reference slot length acts as a normalization factor that makes different numerologies comparable and manageable within a unified constraint framework.
Data Source
AI summary
Method and UE are provided for scheduling for scheduling with multiple cells. In particular, a UE can connect to a plurality of cells in a network. The UE can determine a reference slot length according to an SCS of a first cell of the plurality of cells.