Terminal CDRX Cycle Alignment for XR Service Timing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The CDRX cycle of terminal devices does not match the service cycle of XR services, leading to power wastage and delay issues due to mismatched transmission times, which are all integers while XR service cycles are decimals.
Innovation Solution
A method to determine a CDRX cycle that aligns with the XR service cycle using a calculation rule that adjusts the CDRX cycle to match the service cycle, allowing for both integer and decimal values, and includes mechanisms for dynamic and semi-static configuration of CDRX cycles through RRC and MAC CE messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the CDRX cycle is configured as an integer value to simplify the mechanism, then the device complexity is reduced, but the CDRX cycle cannot match the decimal service cycle of XR services, leading to power waste and delay
Solution Approach 1:
The patent changes the parameter type of CDRX cycle from integer only to support both integer and decimal values. This allows the CDRX cycle to be configured with the same decimal value as the XR service cycle (e.g., 8.33ms for 120fps), enabling precise matching between wake-up intervals and service data transmission intervals, thereby eliminating power waste while maintaining manageable device complexity through standardized configuration methods.
2Device complexity
If the CDRX cycle is configured as an integer value, then the configuration is simpler, but the terminal device cannot receive service data at the correct time, resulting in service delay
Solution Approach 1:
The patent enables the CDRX cycle parameter to accept decimal values matching the XR service frame rate requirements. For example, with 120fps service requiring 8.33ms intervals, the CDRX cycle can now be configured as 8.33ms instead of being restricted to integer values like 8ms or 10ms. This ensures the terminal device wakes up exactly when service data is transmitted, eliminating service delay while keeping the configuration process simple through standardized RRC parameter settings.
3Ease of operation
If the terminal device wakes up at integer intervals, then the monitoring rhythm is simpler, but it misses decimal-timed service frames, causing power waste
Solution Approach 1:
The patent allows the CDRX cycle parameter to be set to decimal values that exactly match the XR service transmission intervals. When the service operates at 120fps with 8.33ms frame intervals, the CDRX cycle can be configured as 8.33ms, enabling the terminal to wake up precisely when service frames are transmitted. This eliminates the mismatch that causes power waste while maintaining a simple and regular monitoring rhythm synchronized with the service timing.
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A terminal energy saving method, an apparatus, and a system are provided. The method includes: A terminal device receives first information from a network device, where the first information is used for determining a first CDRX cycle corresponding to the terminal device; and the terminal device determines, according to the first CDRX cycle and a first calculation rule, a moment at which the terminal device enters activation duration, where the first calculation rule is used for controlling the moment at which the terminal device enters the activation duration to match a moment at which the network device sends a downlink frame of a first service according to a service cycle.