Sidelink DRX Command Structure for Multi-Service Power Saving
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Solution Overview
Problem
The current Uu DRX command MAC CE format is inflexible and not suitable for sidelink (SL) scenarios, where UEs may perform multiple unicast/multicast services simultaneously, lacking granularity in controlling sidelink discontinuous reception.
Innovation Solution
Implementing a sidelink discontinuous reception method and apparatus that uses a sidelink DRX command MAC CE carrying a valid object and/or range, allowing finer granularity in controlling SL DRX timers and power saving, with formats including MAC CE subheaders and payloads to indicate specific SL DRX parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the current Uu DRX command MAC CE format is used for sidelink, then the control mechanism can be applied, but the granularity is insufficient and flexibility is lost for multiple unicast/multicast services
Solution Approach 1:
The patent segments the SL DRX command MAC CE into multiple fields including a destination index field, a first field indicating first SL DRX parameters, and a second field indicating second SL DRX parameters. This segmentation allows independent control of different SL DRX configurations for multiple unicast/multicast services, providing fine-grained control while maintaining flexibility.
Solution Approach 2:
The patent introduces a new dimension of control by adding a destination index field that identifies different destination UEs or groups, and separate fields for different SL DRX parameter sets. This multi-dimensional structure enables the same MAC CE to control multiple services with different parameters, resolving the contradiction between flexibility and control granularity.
2Use of energy by moving object
If per UE granularity DRX command is used, then power saving can be achieved, but it is not suitable for SL scenarios with multiple connections
Solution Approach 1:
The patent creates a universal SL DRX command MAC CE structure that can serve multiple functions: it can control unicast services, multicast services, or a combination thereof, all within a single MAC CE format. The destination index field and multiple parameter fields enable this multi-functionality, allowing the same mechanism to achieve power saving across different SL scenario types.
Solution Approach 2:
The patent enables dynamic parameter changes by incorporating fields that can indicate different SL DRX parameter sets (e.g., different onDurationTimer, drx-InactivityTimer values) for different destinations or services. This parameter flexibility allows the system to optimize power saving for each specific service type while maintaining a unified control mechanism.
Data Source
AI summary
An implementation method and apparatus for sidelink discontinuous reception and a terminal. The sidelink discontinuous reception implementation method in the embodiment of this application includes: receiving, by a first terminal, a sidelink discontinuous reception command media access control control element SL DRX command MAC CE sent by a second terminal, where the SL DRX command MAC CE carries a valid object and/or a range of the SL DRX command MAC CE; and performing, by the first terminal, a first operation according to the valid object and/or range of the SL DRX command MAC CE. This can further improve the flexibility of SL DRX power saving control while satisfying the terminal power saving requirement.