Semi-Persistent Scheduling Configuration via RRC and PDSCH
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Solution Overview
Problem
Current semi-persistent scheduling (SPS) configurations in wireless communication systems face inefficiencies due to slow RRC signaling updates, high overhead in dynamic grant-based systems, and mismatch between SPS parameters and dynamically changing wireless channel conditions.
Innovation Solution
The method involves transmitting a radio resource control (RRC) signal with a time and frequency configuration for SPS, and an information block via a physical downlink shared channel (PDSCH) configured based on this SPS configuration, which includes signaling for parameters like modulation and coding scheme (MCS), PDSCH-to-HARQ feedback timing, and PUCCH resource indicator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If RRC signaling is used to update SPS parameters, then configuration reliability is maintained, but signaling speed is too slow to adapt to dynamic channel conditions
Solution Approach 1:
The patent segments the parameter update process into two parts: static SPS configuration parameters are updated via RRC signaling for reliability, while dynamic parameters (MCS, timing, resources) are updated via MAC CE for speed. This segmentation allows each signaling type to operate in its optimal performance zone.
Solution Approach 2:
The patent introduces MAC CE as an intermediary mechanism between RRC signaling and physical layer transmissions. MAC CE receives the SPS configuration from RRC and carries dynamic parameter updates, acting as a mediator that bridges the gap between slow but reliable RRC signaling and fast but less reliable direct physical layer updates.
2Adaptability or versatility
If dynamic grant-based transmissions are used, then resource allocation flexibility is improved, but signaling overhead increases
Solution Approach 1:
The patent implements semi-persistent scheduling where resources are allocated periodically based on pre-configured SPS parameters. Instead of sending dynamic grants for every transmission, the system establishes a periodic transmission pattern that reduces signaling overhead while maintaining adaptability through MAC CE updates when channel conditions change.
Solution Approach 2:
The patent performs preliminary configuration of SPS parameters via RRC signaling before actual data transmissions begin. This preliminary action pre-establishes resource allocation patterns, modulation schemes, and timing information, eliminating the need for repeated dynamic grant signaling and reducing overall overhead.
3Adaptability or versatility
If SPS parameters are updated frequently via RRC signaling, then channel adaptation improves, but resource wastage occurs due to excessive signaling
Solution Approach 1:
The patent applies partial action by updating only the necessary dynamic parameters (MCS, timing, resources) via MAC CE rather than reconfiguring all SPS parameters through RRC signaling. This selective update approach achieves adequate channel adaptation without the resource wastage of complete reconfiguration.
Solution Approach 2:
The patent changes the state of parameter update mechanisms by introducing MAC CE-based updates for dynamic parameters while maintaining RRC signaling for static parameters. This parameter-specific approach allows frequent updates of critical channel adaptation parameters without triggering excessive full-configurations that waste resources.
Data Source
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AI summary
Systems and methods for configuring semi-persistent scheduling (SPS) transmission are disclosed. An example method performed by a wireless device includes: transmitting, to a user equipment, a radio resource control (RRC) signal comprising a time and frequency configuration for semi-persistent scheduling (SPS); and transmitting, to the user equipment, an information block via a physical downlink shared channel (PDSCH) configured based on the time and frequency configuration for SPS, the information block comprising signaling indicating at least one of: a modulation and coding scheme (MCS) for a subsequent transmission, a transmit power control command (TPC) for physical uplink control channel (PUCCH), PDSCH-to-HARQ feedback timing indicator, and PUCCH resource indicator.