Sidelink DRX Pattern Signaling for Reliable Discovery
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Solution Overview
Problem
Sidelink communication in wireless networks faces challenges with power consumption and discovery difficulties due to discontinuous reception (DRX) patterns, leading to missed discovery messages and resource reservations when UEs are in DRX OFF duration.
Innovation Solution
UEs broadcast their DRX patterns in sidelink discovery messages and monitor for communication accordingly, allowing synchronized communication within DRX ON durations, thereby improving discovery and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If UEs use DRX patterns to reduce power consumption, then power usage is reduced, but discovery messages and resource reservations are missed during DRX OFF duration
Solution Approach 1:
The patent applies preliminary action by having UEs broadcast their DRX pattern information in advance through sidelink discovery messages. This allows other UEs to know when to expect communications and schedule their monitoring accordingly, ensuring discovery reliability while maintaining power savings. The DRX pattern information is prepared and transmitted beforehand, enabling synchronized communication without requiring continuous monitoring.
Solution Approach 2:
The patent implements feedback by including DRX pattern information in sidelink discovery messages and resource reservation messages. This feedback mechanism allows receiving UEs to adjust their monitoring schedules based on the transmitting UE's DRX pattern, ensuring that communications occur during DRX ON durations. The feedback loop enables both UEs to coordinate their activities and maintain reliable discovery while preserving power consumption benefits.
2Reliability
If UEs continuously monitor for sidelink communication, then discovery reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies periodic action by establishing monitoring schedules that align with DRX ON durations. UEs monitor for sidelink communications periodically during their DRX ON periods rather than continuously. The monitoring frequency and timing are determined by the DRX pattern parameters (drx-OnDuration, drx-InactivityTimer, etc.), creating a periodic monitoring rhythm that maintains discovery reliability while significantly reducing power consumption compared to continuous monitoring.
Solution Approach 2:
The patent uses preliminary action by exchanging DRX pattern information through discovery messages before actual communication occurs. This allows UEs to pre-coordinate their monitoring and transmission schedules, ensuring that both UEs are active during the same time windows. The preliminary exchange of DRX information enables UEs to configure their monitoring schedules in advance, maintaining reliability without continuous power consumption.
3Reliability
If UEs exchange DRX pattern information in discovery messages, then communication synchronization is improved, but message complexity increases
Solution Approach 1:
The patent applies universality by using existing sidelink discovery message structures to carry DRX pattern information. Rather than creating separate dedicated signaling channels, the DRX pattern parameters are embedded within standard discovery messages (such as SL-DMSG). This multi-functional approach allows the same message infrastructure to serve both discovery purposes and DRX coordination purposes, improving synchronization without significantly increasing overall system complexity.
Solution Approach 2:
The patent implements parameter changes by adding DRX-related parameters (drx-OnDuration, drx-InactivityTimer, drx-RetransmissionTimer, etc.) to the discovery message information elements. These parameter additions enable precise control over communication synchronization while maintaining a structured and organized message format. The parameter-based approach allows flexible configuration of DRX patterns without requiring fundamental changes to the message structure, balancing synchronization improvement with manageable complexity.
Data Source
AI summary
A wireless device determines a discontinuous reception (DRX) pattern for sidelink communication and performs sidelink activity within a DRX ON duration of the DRX pattern. A wireless device may transmit a sidelink discovery message including information about a DRX pattern of the first wireless device and may monitor for sidelink communication based on the DRX pattern. A second wireless device may receive a sidelink discovery message from the first wireless device including information about a DRX pattern of the first wireless device and may exchange sidelink communication with the first wireless device based on the DRX pattern.