Cross-Carrier Scheduling with Numerology Thresholds
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G-NR networks, face challenges in efficiently handling cross-carrier scheduling with different numerologies between scheduling and scheduled cells, leading to increased complexity and limitations in flexible scheduling due to large differences in subcarrier spacing, which affects the availability and efficiency of PDSCH/PUSCH transmissions.
Innovation Solution
Implementing a method that restricts the difference in numerologies between scheduling and scheduled cells, allowing for automatic BWP switching and self-scheduling in cases where the indicated BWP results in excessive numerology differences, ensuring that only compatible BWPs are used for cross-carrier scheduling, and utilizing time bundling for semi-static HARQ-ACK codebooks to reduce payload and improve transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cross-carrier scheduling is implemented with different numerologies between scheduling and scheduled cells, then scheduling flexibility is improved, but UE complexity increases
Solution Approach 1:
The patent introduces a threshold parameter (e.g., threshold value of 2 or 3) to control the maximum allowable difference in numerologies between scheduling and scheduled cells. By changing this parameter threshold, the system achieves a balance between scheduling flexibility and UE complexity, allowing cross-carrier scheduling with limited numerology differences while preventing excessive complexity at the UE end.
2Adaptability or versatility
If the difference in numerologies between scheduling and scheduled cells is large, then cross-carrier scheduling capability is improved, but HARQ-ACK transmission efficiency deteriorates
Solution Approach 1:
The patent dynamically adjusts the numerology difference threshold parameter to optimize HARQ-ACK transmission efficiency. When the numerology difference exceeds the threshold, the system modifies scheduling parameters or selects alternative cell combinations, thereby maintaining efficient HARQ-ACK feedback while preserving cross-carrier scheduling capability within acceptable limits.
Solution Approach 2:
The patent implements feedback mechanisms where the UE reports its capability regarding numerology differences to the network. Based on this feedback, the network dynamically configures appropriate scheduling parameters and selects suitable cell combinations for cross-carrier scheduling, ensuring efficient HARQ-ACK transmission while maximizing scheduling flexibility.
3Adaptability or versatility
If automatic BWP switching is implemented for cross-carrier scheduling, then scheduling adaptability is improved, but system complexity increases
Solution Approach 1:
The patent pre-configures multiple BWPs with different numerologies for scheduled cells before actual scheduling occurs. The network and UE agree in advance on which BWPs are available and their corresponding numerologies, allowing automatic switching during scheduling without requiring complex real-time decisions. This preliminary configuration simplifies the system while maintaining high adaptability.
Data Source
AI summary
A computer-readable storage medium stores instructions to configure a UE for cross-carrier scheduling of data transmissions in a 5G NR and beyond wireless network, and to cause the UE to perform operations including decoding configuration signaling received from a base station. The configuration signaling indicates a first numerology parameter for a scheduling cell of the base station and a second numerology parameter for a scheduled cell of the base station. DCI is received via a PDCCH of the scheduling cell. The DCI schedules a DL data transmission in the scheduled cell of the base station. The DL data transmission is received via a PDSCH of the scheduled cell when a difference between the first numerology parameter and the second numerology parameter is smaller than or equal to a pre-configured numerology threshold value. The UE refrains from decoding the DL data transmission when the difference is greater than the threshold value.