SPS Timer Management via C-RNTI PDCCH in NR Terminals
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Solution Overview
Problem
The semi-persistent scheduling (SPS) timer in new radio (NR) is not compatible with the existing system framework, particularly when dynamic resources are scheduled based on a cell radio network temporary identifier (C-RNTI, leading to unclear regulations and inefficient timer management.
Innovation Solution
A timer management method that allows the terminal device to start or stop the SPS timer based on receiving a physical downlink control channel (PDCCH) scrambled using a C-RNTI, determining whether to stop or start the timer based on specific conditions such as hybrid automatic repeat request (HARQ) processes and resource configurations, thereby improving compatibility with the existing system framework.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the SPS timer is started when dynamic resources are scheduled based on C-RNTI, then the timer management becomes more compatible with the existing system framework, but the complexity of timer control logic increases
Solution Approach 1:
The patent inverts the traditional timer management approach by starting the SPS timer when C-RNTI resources are received (opposite of the conventional approach where timer starts only with SPS-RNTI). This inversion resolves the contradiction by making the timer more adaptable to existing C-RNTI-based scheduling while establishing clear inversion-based rules to manage the increased control logic complexity
Solution Approach 2:
The patent introduces dynamic timer management where the SPS timer can be started, stopped, or restarted based on the type of RNTI used for scheduling. The timer behavior dynamically adapts to whether C-RNTI or SPS-RNTI is used, resolving the compatibility issue while using conditional dynamics to manage control complexity
2Reliability
If the SPS timer is stopped when C-RNTI resources are received, then resource conflicts are avoided, but the timer management becomes less compatible with existing system framework
Solution Approach 1:
The patent uses dynamic conditional logic where the timer is stopped only when C-RNTI resources are received, while maintaining restart capability. This dynamic approach ensures resource conflict avoidance (reliability) while preserving compatibility with the existing framework through conditional rather than absolute timer management
Solution Approach 2:
The patent changes the timer state parameter dynamically based on the scheduling RNTI type. When C-RNTI is detected, the timer parameter changes to stopped; when SPS-RNTI is detected, the timer parameter changes to running. This parameter-based dynamic management resolves both reliability and compatibility requirements
Data Source
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AI summary
Provided are a method for managing timer and transmitting information, a terminal device, and a network device. The method for managing a timer is applied to a terminal device, and the terminal device is provided with a semi-persistent scheduling (SPS) timer. The method comprises: after receiving a first physical downlink control channel (PDCCH) that is scrambled by a cell radio network temporary identifier (C-RNTI), the terminal device determines whether to stop or start the SPS timer. In the embodiments of the present application, after receiving the first PDCCH, the terminal device enables the SPS timer to be started on the basis of the dynamic resources scheduled by the C-RNTI or to start or stop, thereby effectively improving the compatibility of the SPS timer with an existing system framework.