Sidelink DRX Timer Configuration for Reliable Signal Reception
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Solution Overview
Problem
The direct reuse of Uu DRX in sidelink communication results in packet loss, low reliability, and low resource utilization due to the user no longer receiving SCI or PSFCHs outside the active time.
Innovation Solution
A transmission or reception configuration method that includes obtaining a configuration to execute sensing, measurement, resource selection, or transmission/reception control within a time domain range defined by preset timers or ranges, thereby managing terminal behaviors to avoid packet loss and improve reliability and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If Uu DRX is directly reused in sidelink communication, then energy saving is achieved by monitoring only PDCCH within active time, but packet loss occurs and reliability decreases because SCI or PSFCHs outside active time are not received
Solution Approach 1:
The patent applies dynamics by making the DRX active time configurable and adaptable to different sidelink scenarios. The network can dynamically adjust the active time duration and timing to ensure that SCI and PSFCH resources fall within the active period, while still allowing the terminal to enter sleep mode for energy saving. This resolves the contradiction by making the system flexible enough to maintain reliability while preserving energy efficiency.
Solution Approach 2:
The patent changes key parameters of the DRX mechanism for sidelink application. Specifically, it modifies the active time configuration, introduces new parameters for sidelink resource indication, and adjusts the timing relationships between DRX cycles and sidelink transmissions. These parameter changes enable the system to maintain both energy efficiency and communication reliability by ensuring critical signals are received during active periods.
2Use of energy by moving object
If Uu DRX is directly reused in sidelink communication, then monitoring is limited to active time periods, but resource utilization decreases because scheduled resources may fall outside active time
Solution Approach 1:
The patent applies preliminary action by having the network pre-configure the DRX active time to align with scheduled sidelink resource occasions. Before resources are allocated, the network calculates and communicates the appropriate active time window that encompasses all necessary SCI and PSFCH resources. This ensures that when the terminal wakes up, it is already positioned to receive all scheduled transmissions without missing resources, thereby maintaining high resource utilization while preserving energy savings.
3Loss of energy
If active time is limited for energy saving, then terminal power consumption decreases, but packet loss increases when SCI or PSFCH fall outside active time
Solution Approach 1:
The patent applies feedback by implementing a mechanism where the network receives information about the terminal's DRX active time configuration and uses this feedback to optimize resource scheduling. The network adjusts the timing of SCI and PSFCH transmissions based on the terminal's active periods, ensuring that critical control information is delivered during wake-up intervals. This feedback loop prevents packet loss while maintaining the terminal's energy-saving sleep schedule.
Data Source
AI summary
A transmission or reception configuration method and a terminal are provided. The transmission or reception configuration method is performed by a first terminal and includes: obtaining a transmission or reception configuration, where the transmission or reception configuration is used for configuration of a target parameter, where the target parameter includes a first preset timer, and the first preset timer includes a round-trip time timer (RTT timer); obtaining a first target moment; and starting the first preset timer at the first target moment, where the first target moment is a first preset moment or the first preset moment shifted by a first offset. The first preset moment includes a moment at which a physical uplink control channel (PUCCH) is sent or a moment associated with a last obtained sidelink downlink control information (SL DCI).