Sidelink C-DRX Timing for Bidirectional Unicast Traffic
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Solution Overview
Problem
Existing SL DRX solutions in wireless communication systems fail to efficiently balance resource allocation between UEs for bidirectional communication, leading to increased interference and reduced throughput due to LBT failures and collisions, especially in C-DRX mode.
Innovation Solution
Implement techniques for extending DRX on-durations into transmission durations and vice versa, allowing UEs to transmit or monitor for data during designated times, while maintaining power savings and avoiding collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional SL DRX is used with separate transmission durations and DRX on-durations, then power consumption is reduced through periodic sleep states, but data transmission efficiency deteriorates due to LBT failures and collisions
Solution Approach 1:
The patent merges transmission durations and DRX on-durations into a unified time resource structure. UEs can be configured with time resources that allow both transmission and monitoring functions within the same duration, eliminating the need for separate transmission durations and DRX on-durations. This integration reduces LBT failures and collisions while maintaining power-saving benefits through selective activation of monitoring only when needed.
Solution Approach 2:
The patent introduces dynamic adjustment mechanisms where UEs can flexibly switch between transmission and monitoring roles based on traffic conditions and priority requirements. The network can dynamically configure time resources, activating monitoring during transmission durations when high-priority data needs to be received, and deactivating it during low-activity periods to save power. This dynamic approach optimizes both power consumption and transmission efficiency.
2Reliability
If UEs monitor for data continuously to avoid data loss, then data reception reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements feedback mechanisms where UEs report their reception status and traffic requirements to the network. Based on this feedback, the network intelligently configures monitoring activation patterns, activating monitoring only when there is actual data to receive or when high reliability is required, and deactivating it during periods of no traffic or low priority traffic to conserve power.
Solution Approach 2:
The patent changes the operational parameters of UE monitoring by introducing configurable activation conditions and time window adjustments. Instead of continuous monitoring or fixed periodic monitoring, the system dynamically adjusts monitoring parameters such as activation time, duration, and frequency based on traffic patterns, priority levels, and reception status feedback, optimizing the balance between reliability and power consumption.
3Productivity
If transmission durations are extended to accommodate more data, then data throughput is improved, but collision probability with other UEs increases
Solution Approach 1:
The patent applies preliminary action by having UEs report their traffic requirements, priority levels, and reception status to the network in advance. Based on this advance information, the network pre-configures time resources and monitoring activation patterns that accommodate multiple UEs' transmission needs while minimizing collision probability. This preliminary planning allows the system to allocate resources more efficiently before actual transmission occurs.
Data Source
AI summary
Aspects of the disclosure relate to sidelink (SL) discontinuous reception (DRX) techniques. A first device may determine SL DRX configuration parameters for SL communication between the first device and a second device. The SL DRX configuration parameters include a plurality of first transmission durations and a plurality of first DRX on-durations, the plurality of first transmission durations include times during which the first device is permitted to transmit via SL communication to the second device and the plurality of first DRX on-durations include times during which the first device monitors for SL communication from the second device. The first device may, at least one of, monitor for SL communication from the second device during at least one of the plurality of first transmission durations, or transmit via SL communication to the second device during at least one of the plurality of first DRX on-durations.