Sidelink Discontinuous Reception Configuration Rejection
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Solution Overview
Problem
The implementation of sidelink discontinuous reception (SL-DRX) in 5G NR systems faces challenges during handover procedures and sidelink resource allocation, particularly due to conflicts between Mode 1/Mode 2 sidelink resource allocation mechanisms and differences in sidelink frequency carriers supported by UEs and serving cells.
Innovation Solution
A method and system for sidelink discontinuous reception (SL-DRX) that involves rejecting SL-DRX configurations by transmitting specific signaling messages to the serving cell based on the cast type of the sidelink service, allowing for the disabling of the SL-DRX mechanism for sidelink services, and managing SL-DRX configurations through RRCReconfigurationSidelink messages to ensure seamless handover and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If SL-DRX configuration is applied to all sidelink services, then power saving is improved, but service quality deteriorates due to conflicts during handover and resource allocation
Solution Approach 1:
The patent applies different SL-DRX configuration strategies to different sidelink service types. Unicast services receive customized SL-DRX configurations tailored to their specific requirements, while groupcast and broadcast services use standardized configurations. This local differentiation allows optimization of power saving for each service type without compromising overall service quality.
Solution Approach 2:
The patent implements dynamic SL-DRX configuration adjustment during handover procedures. The UE can modify its SL-DRX settings in response to changing network conditions and handover events, allowing the system to adapt between power saving mode and service quality maintenance mode as needed.
2Loss of energy
If SL-DRX mechanism is enabled for all cast types, then energy efficiency is improved, but configuration conflicts increase during handover and resource allocation
Solution Approach 1:
The patent segments the SL-DRX configuration process by cast type. Separate configuration procedures are established for unicast, groupcast, and broadcast services, each with its own specific rules and parameters. This segmentation reduces configuration conflicts during handover and resource allocation by preventing incompatible settings from interacting.
Solution Approach 2:
The patent introduces an intermediary configuration validation mechanism that checks for compatibility between SL-DRX settings and current network conditions before applying configurations during handover. This intermediary layer filters out conflicting configurations and ensures only valid settings are activated, reducing overall system complexity.
3Reliability
If SL-DRX configuration is rejected for unicast services, then service quality is maintained, but overhead increases due to additional signaling
Solution Approach 1:
The patent applies partial SL-DRX configuration rejection, where the UE selectively rejects SL-DRX settings only when they conflict with service requirements or handover conditions, rather than rejecting all configurations uniformly. This partial approach maintains service quality when needed while minimizing unnecessary signaling overhead.
Solution Approach 2:
The patent implements a feedback mechanism where the UE signals its SL-DRX configuration status to the network. This feedback loop allows the network to understand when configuration rejection is necessary and adjust its signaling accordingly, reducing overall overhead by avoiding redundant configuration messages.
Data Source
AI summary
Methods and user equipment of sidelink discontinuous reception (SL-DRX) are provided. The method includes: rejecting a SL-DRX configuration of a sidelink service by transmitting one of a first signaling and a second signaling with a sidelink destination identity to a serving cell of the first UE according to a cast type of the sidelink service, wherein the sidelink destination identity is associated with the sidelink service and the SL-DRX configuration is configured by the serving cell; and in response to rejecting the SL-DRX configuration, disabling a SL-DRX mechanism for the sidelink service and the sidelink destination identity.