Sidelink DRX Configuration Alignment for NR V2X Groupcast
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, especially for groupcast communication, the discontinuous reception (DRX) cycle configurations between User Equipments (UEs) can be mismatched, leading to missed data transmissions during active periods, necessitating alignment of DRX cycles to ensure effective communication.
Innovation Solution
A method and apparatus for selecting and aligning sidelink (SL) DRX configurations among UEs in a group, involving the transmission of SL control information to schedule the physical sidelink shared channel, ensuring synchronized DRX cycles for groupcast communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If each UE uses independent DRX cycle configurations for power saving, then power consumption is reduced, but data transmission reliability deteriorates due to misalignment between transmitting and receiving UEs
Solution Approach 1:
The patent merges the DRX cycle configurations of multiple UEs in a group by establishing a groupcast DRX configuration that is common to all members. The transmitting UE and receiving UEs align their active times and DRX cycles through groupcast signaling, enabling them to simultaneously be in active state for reliable data reception while maintaining power saving benefits through coordinated discontinuous reception.
Solution Approach 2:
The transmitting UE performs preliminary actions by determining the groupcast DRX configuration based on its own DRX parameters and proactively signaling this configuration to all receiving UEs in the group. This preliminary configuration exchange ensures that all UEs are pre-synchronized before actual data transmission begins, eliminating the need for complex real-time alignment mechanisms.
2Reliability
If DRX cycle configurations are aligned among all UEs in a group, then data transmission reliability is improved, but device complexity increases due to configuration coordination requirements
Solution Approach 1:
The transmitting UE autonomously determines the groupcast DRX configuration by processing its own unicast DRX parameters and applying groupcast-specific adjustments. This self-service approach eliminates the need for complex multi-UE negotiation protocols, as each UE independently derives the group configuration from the transmitting UE's signaled parameters, significantly reducing coordination overhead and device complexity.
Solution Approach 2:
The patent introduces a simplified intermediary mechanism where the transmitting UE acts as a configuration distributor. By signaling the groupcast DRX configuration parameters to all receiving UEs through groupcast control channels, the system avoids complex peer-to-peer coordination among all group members, reducing overall system complexity while ensuring reliable synchronized operation.
3Productivity
If DRX configuration information is transmitted to all group members, then communication efficiency is improved, but overhead increases due to additional signaling
Solution Approach 1:
The patent makes the DRX configuration information serve multiple functions simultaneously. The same groupcast DRX configuration parameters are used for both power saving operation and for synchronizing data transmission timing across all UEs. This multi-functionality eliminates the need for separate signaling mechanisms for transmission scheduling, reducing overall signaling overhead while maintaining high communication efficiency.
Solution Approach 2:
The system changes the parameters of existing DRX configuration messages to include groupcast-specific fields. By modifying the DRX configuration parameters to encompass both unicast and groupcast operation requirements, the patent avoids creating entirely new signaling protocols, thereby reducing overhead while enabling efficient groupcast communication with synchronized DRX cycles.
Data Source
AI summary
A method for performing wireless communication by a first device and an apparatus supporting same are provided. The method may comprise the steps of: selecting a sidelink (SL) discontinuous reception (DRX) configuration for groupcast communication among at least one SL DRX configuration, the SL DRX configuration including information related to a DRX cycle and information related to an active time; transmitting first sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) to at least one second device in a group through a physical sidelink control channel (PSCCH); transmitting second SCI including a destination ID and information related to the SL DRX configuration to the at least one second device through the PSSCH; and on the basis of the SL DRX configuration, performing the groupcast communication with the at least one second device.