Minimum Scheduling Offsets for Mixed-Numerology PDSCH Reception
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Solution Overview
Problem
Wireless devices in RRC_CONNECTED mode face inefficiencies in PDCCH monitoring due to unknown cross-slot scheduling, leading to unnecessary power consumption and potential missed PDSCH reception when mixed numerologies are used.
Innovation Solution
The network node and wireless device communicate preferred minimum scheduling offsets for different subcarrier spacings to determine and configure a robust minimum scheduling offset parameter, considering same or mixed numerology scenarios, using equations to calculate the minimum scheduling offset for each bandwidth part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If cross-slot scheduling is used without advance knowledge, then the wireless device can perform PDSCH buffering and save power, but the device cannot enter microsleep early and may miss PDSCH reception
Solution Approach 1:
The network node configures the minimumSchedulingOffset parameter in advance through RRC signaling, allowing the wireless device to know ahead of time when cross-slot scheduling will be used. This preliminary configuration enables the device to enter microsleep early without risking missed PDSCH reception, as the offset parameter specifies the guaranteed minimum time between PDCCH and PDSCH.
2Loss of energy
If the minimumSchedulingOffset parameter is configured with a value greater than 0, then the wireless device can enter microsleep early and save power, but the scheduling flexibility is reduced
Solution Approach 1:
The system allows dynamic adjustment of the minimumSchedulingOffset parameter based on actual scheduling needs. The network node can configure different offset values for different bandwidth parts and numerologies, and can adjust these values dynamically to balance power saving requirements with scheduling flexibility requirements in different operational scenarios.
3Loss of energy
If the wireless device supports WD-assistance to inform the network node of preferred minimumSchedulingOffset, then power-saving efficiency is improved, but the device complexity increases
Solution Approach 1:
The wireless device provides feedback to the network node by indicating its preferred minimumSchedulingOffset values through RRC signaling. This feedback mechanism allows the network to optimize power saving configurations based on the device's actual capabilities and requirements, while the feedback is carried out through standard RRC procedures that do not significantly increase device complexity.
4Adaptability or versatility
If mixed numerologies are used with different subcarrier spacings, then the system adaptability is improved, but the minimum scheduling offset calculation becomes more complex
Solution Approach 1:
The system handles mixed numerologies by processing each bandwidth part with its specific subcarrier spacing independently. The minimumSchedulingOffset is calculated and configured separately for each BWP, allowing the complex mixed numerology scenario to be broken down into manageable per-BWP calculations, thereby reducing overall system complexity.
Data Source
AI summary
Methods and apparatuses are disclosed for minimum scheduling offset interpretation. In one embodiment, the network node is configured receive an indication of a first preferred value for a minimum scheduling offset for a first bandwidth part, BWP, having a first subcarrier spacing, SCS, and a second preferred value for a minimum scheduling offset for a second bandwidth part, BWP, having a second subcarrier spacing, SCS; determine a minimum scheduling offset parameter for at least one of the first BWP having the first SCS and the second BWP having the second SCS based at least in part on at least one of the first preferred value and the second preferred value; and configure the wireless device with the determined minimum scheduling offset parameter. In another embodiment, a wireless device is configured to indicate the first and second preferred values.