Sidelink DRX Wake-Up Signaling for Low-Latency Paging
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Solution Overview
Problem
Existing sidelink communication systems face challenges in efficiently supporting discontinuous reception (DRX) operations, leading to increased power consumption and delays due to higher layer signaling in paging operations.
Innovation Solution
A method and apparatus for generating and transmitting a physical layer (PHY) wake-up signal based on sequence information and DRX configuration, allowing terminals to transition between sleep and connected modes according to a DRX cycle, with adjustments based on wake-up signal detection failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher layer signaling is used for paging operations in sidelink communication, then paging functionality can be achieved, but power consumption increases and delays occur
Solution Approach 1:
The patent replaces higher layer signaling (MAC layer paging) with physical layer signaling (PHY layer wake-up signal). The wake-up signal uses physical layer sequences and signaling mechanisms instead of higher layer protocols, thereby reducing power consumption and latency while maintaining paging functionality in sidelink DRX operations
Solution Approach 2:
The patent introduces a physical layer wake-up signal as an intermediary between the paging function and the terminal. This wake-up signal serves as a mediator that triggers DRX terminal wake-up without requiring full higher layer signaling exchange, reducing both power consumption and delay
2Reliability
If higher layer signaling is used for paging operations in sidelink communication, then paging functionality can be achieved, but delays occur
Solution Approach 1:
The patent replaces higher layer signaling (MAC layer paging) with physical layer signaling (PHY layer wake-up signal). The wake-up signal uses physical layer sequences and signaling mechanisms instead of higher layer protocols, thereby reducing power consumption and latency while maintaining paging functionality in sidelink DRX operations
Solution Approach 2:
The patent transmits the wake-up signal before the DRX terminal needs to wake up for potential data transmission. This preliminary action allows the terminal to wake up in advance and prepare for communication, reducing overall paging delay and enabling smoother transition from sleep to active state
3Loss of time
If terminals continuously monitor for paging signals, then no paging delay occurs, but power consumption increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) where terminals periodically wake up to monitor for wake-up signals and then return to sleep mode. This periodic monitoring approach balances power consumption and paging delay by having terminals check for signals at regular intervals rather than continuously, enabling energy-efficient operation while maintaining timely paging response
Solution Approach 2:
The patent introduces a physical layer wake-up signal as an intermediary between the paging function and the terminal. This wake-up signal serves as a mediator that triggers DRX terminal wake-up without requiring full higher layer signaling exchange, reducing both power consumption and delay
Data Source
AI summary
Disclosed are a method and device for sidelink communication based on DRX. A method for operating a transmission terminal comprises the steps of: receiving PHY DRX configuration information from a base station; generating a wakeup signal on the basis of sequence information included in the PHY DRX configuration information; and transmitting the wakeup signal to a reception terminal in a resource region indicated by resource information included in the PHY DRX configuration information.