Sidelink DRX Cycle Alignment with PSFCH Periodicity
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Solution Overview
Problem
In sidelink communication systems, the discontinuous reception (DRX) operation for feedback information transmission and reception is not efficiently aligned with the physical sidelink feedback channel (PSFCH) periodicity, leading to power consumption issues and inefficient data transfer.
Innovation Solution
Configuring a sidelink discontinuous reception (SL DRX) cycle that aligns with the PSFCH periodicity, allowing for efficient transmission and reception of feedback information by ensuring the PSFCH is within the on-duration of the SL DRX cycle, and optionally setting the SL DRX cycle as a multiple of the PSFCH periodicity or equal to it, with consideration for HARQ response multiplexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the terminal performs DRX operation to save power, then power consumption is reduced, but feedback information cannot be transmitted and received according to the PSFCH periodicity
Solution Approach 1:
The patent applies dynamics by making the DRX cycle configurable and adaptable to different PSFCH periodicities. The base station can dynamically adjust the DRX cycle length based on the feedback channel periodicity requirements, allowing the system to transition between power-saving mode (longer DRX cycle) and reliable feedback mode (shorter DRX cycle matching PSFCH periodicity).
Solution Approach 2:
The patent changes the parameter of DRX cycle length to resolve the contradiction. By configuring the DRX cycle to be equal to or a multiple of the PSFCH periodicity, the system ensures that feedback information can be properly received during wake-up periods while maintaining power savings during sleep periods. The base station signals the appropriate DRX cycle configuration to the terminal.
2Use of energy by moving object
If the DRX cycle is extended to save more power, then power consumption is reduced further, but the alignment with PSFCH periodicity becomes more difficult
Solution Approach 1:
The patent applies periodic action by aligning the DRX cycle period with the PSFCH periodicity. The terminal wakes up at regular intervals defined by the DRX cycle, and by configuring this cycle to match or be a multiple of the PSFCH periodicity, the system ensures that feedback transmission opportunities occur during wake-up periods, maintaining both power efficiency and feedback effectiveness.
3Reliability
If the terminal wakes up frequently to receive feedback information, then feedback reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies continuity of useful action by ensuring that the DRX wake-up periods continuously align with PSFCH feedback opportunities. By configuring the DRX cycle to match the PSFCH periodicity, the terminal maintains continuous capability to receive feedback information without unnecessary wake-ups, eliminating gaps in feedback reception while avoiding excessive power consumption from frequent wake-ups.
Data Source
AI summary
A DRX-based communication method for power saving in sidelink communication is disclosed. A method for operation of a base station includes the steps of: transmitting information of PSFCH intervals to a terminal; determining an SL DRX cycle on the basis of the PSFCH intervals; and transmitting information of the SL DRX cycle to the terminal, wherein the SL DRX cycle is determined such that a PSFCH according to the PSFCH intervals is located within an on-duration of the SL DRX cycle.