Sidelink DRX Active Time Adjustment for Resource Reselection
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Solution Overview
Problem
Current sidelink Discontinuous Reception (DRX) operations in wireless communication systems face challenges in efficiently managing sidelink active times and resource allocation, leading to unnecessary reception and transmission inefficiencies, especially in scenarios like Vehicle-to-Everything (V2X) communications, where aligning sidelink and downlink DRX configurations is complex due to the lack of control over sidelink resource selection by base stations.
Innovation Solution
The method involves a wireless device monitoring Physical Sidelink Control Channel (PSCCH) transmissions during adjusted sidelink active times based on indications for resource reselection, allowing for dynamic adjustment of sidelink active times and skipping monitoring of PSCCH transmissions for cancelled or deprioritized sidelink transmissions, thereby optimizing power usage and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If sidelink DRX operation uses fixed active time configuration, then device complexity is reduced, but power efficiency deteriorates due to unnecessary monitoring during resource reselection
Solution Approach 1:
The patent applies dynamics by making the sidelink active time configurable and adjustable based on resource reselection indications. The network can dynamically modify the active time duration through RRC reconfiguration messages, allowing the system to adapt between fixed and flexible modes depending on whether resource reselection is needed, thus resolving the contradiction between power efficiency and device complexity
Solution Approach 2:
The patent changes the parameter of active time duration based on resource allocation status. When resource reselection is indicated, the active time is extended to allow monitoring for new resource assignments. When no reselection is needed, the active time returns to normal duration. This parameter adjustment resolves the contradiction by optimizing power consumption only when necessary
2Reliability
If sidelink active time is extended to ensure resource reselection monitoring, then reliability is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts active time duration based on whether resource reselection is indicated. The network controls this through RRC configuration, extending active time only when resource reselection needs to be monitored, and reducing it otherwise. This dynamic adjustment ensures reliability when needed while minimizing power consumption during normal operation
Solution Approach 2:
The system uses self-service by having the UE monitor for resource reselection indications during active time and automatically adjust monitoring behavior based on these indications. The UE serves itself by detecting when extended monitoring is needed through the resource reselection indication mechanism, ensuring reliable resource acquisition without continuous high-power monitoring
3Ease of operation
If sidelink resource selection is autonomous without network control, then ease of operation is improved, but adaptability deteriorates due to misalignment with downlink DRX
Solution Approach 1:
The network acts as an intermediary between autonomous UE resource selection and downlink DRX configuration. Through RRC signaling and resource reselection indications, the network coordinates sidelink resource allocation with downlink DRX timing, enabling autonomous operation while maintaining adaptability to network-wide DRX patterns
Solution Approach 2:
The system uses feedback through resource reselection indications sent by the network to the UE. This feedback mechanism allows the network to inform UEs about resource allocation changes that align with downlink DRX configurations, maintaining ease of autonomous operation while ensuring adaptability to network conditions and downlink scheduling
Data Source
AI summary
A method and apparatus for Sidelink (SL) Discontinuous Reception (DRX) operation based on resource allocation is provided. A first wireless device, e.g., receiving user equipment (RX UE), monitors first Physical Sidelink Control Channel (PSCCH) transmissions from a second wireless device, e.g., transmitting UE (TX UE), in a Sidelink (SL) active time for SL Discontinuous Reception (DRX). The first wireless device receives, from the second wireless device, an indication to reselection of sidelink resources, and adjusts the SL active time based on the indication. The first wireless device monitors second PSCCH transmissions from the second wireless device in the adjusted SL active time.