Semi-Persistent Scheduling Periodicity for XR Traffic Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The mismatch between the semi-persistent scheduling (SPS) periodicity and the periodicity of extended reality (XR) services leads to increased power consumption, resource wastage, and undesirable user experience due to delays in communication systems.
Innovation Solution
Implementing a dual- or multi-periodicity configuration for SPS to align with the periodicity of XR services, allowing pre-allocated radio resources to be cyclically scheduled, thereby reducing power consumption and delays while enhancing user experience and system capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SPS periodicity is set based on fixed SCS granularity (minimum 0.5ms), then resource allocation is simplified, but the SPS periodicity cannot match the periodicity of XR services, leading to increased power consumption and delays
Solution Approach 1:
The patent changes the parameter of SPS periodicity from being fixed based on SCS granularity to being independently configurable. The base station configures multiple SPS periodicity values through RRC signaling, allowing the SPS periodicity to be adjusted to match different XR service periodicities (e.g., 16.67ms for 60fps, 8.33ms for 120fps), thereby reducing UE power consumption by avoiding unnecessary wake-ups and resource monitoring.
Solution Approach 2:
The patent introduces dynamic configurability of SPS periodicity through RRC signaling, allowing the system to adapt to different XR service requirements. The base station can dynamically select and configure appropriate SPS periodicity values from a set of pre-defined options, enabling the scheduling system to respond to varying service periodicities rather than being constrained by fixed SCS-based granularity.
2Productivity
If SPS periodicity is set based on fixed SCS granularity (minimum 0.5ms), then configuration complexity is reduced, but resource allocation efficiency decreases due to mismatch with XR service periodicity
Solution Approach 1:
The patent introduces multiple configurable SPS periodicity parameters that can be selected based on XR service requirements. By configuring specific periodicity values (e.g., 16.67ms, 8.33ms) that match XR service frame rates, the system achieves efficient resource allocation without wasting resources on mismatched scheduling intervals, thereby improving overall resource allocation efficiency.
Solution Approach 2:
The patent employs preliminary configuration of multiple SPS periodicity values through RRC signaling before actual SPS operation. The base station pre-configures a set of permissible SPS periodicity values, and the UE stores these for later selection and use. This preliminary action enables the system to quickly switch to the appropriate periodicity that matches the XR service requirements without real-time computation, thus improving resource allocation efficiency while managing complexity.
3Reliability
If SPS periodicity does not match XR service periodicity, then configuration is simpler, but user experience deteriorates due to communication delays
Solution Approach 1:
The patent configures SPS periodicity values that precisely match XR service periodicity requirements. For example, when the XR service operates at 60fps (16.67ms periodicity), the SPS periodicity is configured to be exactly 16.67ms rather than the nearest fixed granularity value. This parameter alignment ensures that SPS resources are allocated at the exact moments when XR service data needs to be transmitted, eliminating communication delays and improving reliability.
Solution Approach 2:
The patent performs preliminary configuration of multiple SPS periodicity options through RRC signaling, allowing the system to select the optimal periodicity that matches the XR service requirements before actual operation. This advance preparation enables the system to establish timely communication schedules without complex real-time adjustments, thereby improving communication timeliness while keeping the operational complexity manageable.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
This application provides a semi-persistent scheduling method, user equipment, a base station, and a communication system. In the method, the user equipment receives first configuration information that is sent by the base station and that includes an SPS configuration pool including one or more SPS periodicities and an index number corresponding to each SPS periodicity, and receives second configuration information that is sent by the base station and that includes at least one index number in the SPS configuration pool and an order of the at least one index number, to determine, based on the first configuration information and the second configuration information, an SPS periodicity corresponding to the at least one index number. In this way, data scheduled by the base station by using SPS resources can be received by repeatedly using the SPS periodicity corresponding to the at least one index number in the order indicated by the second configuration information, so that the semi-persistent scheduling periodicity matches a periodicity of a service with a periodic characteristic.