Multi-TRP SPS Switching for Reliable Downlink Scheduling
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Solution Overview
Problem
5G-NR systems with multiple active semi-persistent scheduling (SPS) configurations at multiple transmission reception points (TRPs) lead to increased UE processing complexity, power consumption, and resource wastage due to monitoring multiple PDSCHs, despite potential spatial direction differences and varying reliability needs.
Innovation Solution
Implement a primary and secondary SPS configuration, where the UE monitors only the primary configuration initially and switches to the secondary configuration upon unsuccessful decoding, optimizing resource use and reducing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple active SPS configurations are maintained for multi-TRP operation, then PDSCH reliability is improved through diverse spatial directions, but UE processing complexity and power consumption increase due to monitoring multiple PDSCH occasions
Solution Approach 1:
The patent implements dynamic SPS configuration activation where the UE initially monitors only the primary SPS configuration, and the secondary configuration is activated only when decoding fails. This dynamic switching mechanism allows the system to maintain high reliability through multi-TRP diversity while reducing UE processing complexity by monitoring only one configuration at a time under normal conditions.
Solution Approach 2:
The patent segments the SPS monitoring process into two distinct phases: primary monitoring phase where only the primary SPS configuration is monitored, and secondary monitoring phase where the secondary configuration is activated upon decoding failure. This segmentation allows the UE to handle SPS configurations in a staged manner, reducing overall processing complexity while maintaining reliability through selective activation.
2Reliability
If multiple active SPS configurations are maintained for multi-TRP operation, then PDSCH reliability is improved through diverse spatial directions, but UE power consumption increases due to continuous monitoring of multiple PDSCH occasions
Solution Approach 1:
The patent implements periodic activation of the secondary SPS configuration only when decoding fails, rather than continuous monitoring. The UE follows a periodic pattern of monitoring primary SPS, attempting decoding, and only then activating secondary monitoring if needed. This periodic action significantly reduces power consumption compared to continuous dual-configuration monitoring while maintaining reliability through on-demand secondary activation.
Solution Approach 2:
The patent extracts the secondary SPS configuration monitoring from the continuous operation and activates it only when specifically needed (upon decoding failure). This extraction approach allows the system to maintain the capability for multi-TRP reliability while removing the continuous power consumption burden of monitoring both configurations simultaneously, activating only the necessary configuration at each stage.
3Reliability
If multiple active SPS configurations are maintained for multi-TRP operation, then spatial diversity is achieved, but transmission resources are wasted as resources are reserved at multiple TRPs even when no PDSCH transmission occurs
Solution Approach 1:
The patent implements dynamic resource allocation where transmission resources at the secondary TRP are reserved only when needed (upon primary decoding failure). The network dynamically activates the secondary SPS configuration and its associated resources only when the primary configuration fails to decode successfully, allowing spatial diversity to be available on-demand while avoiding continuous resource reservation and waste at multiple TRPs.
Data Source
AI summary
There are provided apparatuses, methods and computer program products. In accordance with an embodiment, there is disclosed a method comprising obtaining from a wireless communication network at least two semi persistent scheduling configurations; obtaining from the wireless communication network an indication which of the at least two semi persistent scheduling configurations is a primary semi persistent scheduling configuration and which is a secondary semi persistent scheduling configuration; monitoring reception of a downlink channel on the primary semi persistent scheduling configuration; decoding a transport block carried on the downlink channel; and examining whether the decoding of the transport block was successful. The method further comprises starting monitoring reception of a downlink channel on the secondary semi persistent scheduling configuration, if the examination indicates an unsuccessful decoding of the transport block.