UE Downlink Traffic Query for Unlicensed Band Power Savings
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Solution Overview
Problem
In wireless communications systems using unlicensed frequency spectrum bands, user equipment (UE) inefficiently monitors channels for transmission opportunities, leading to unnecessary power consumption and resource usage, as they remain in active mode continuously to detect when downlink traffic may start, without knowing when the transmission opportunity will begin.
Innovation Solution
The UE proactively sends a downlink traffic query to the base station when expecting downlink traffic is absent for a threshold duration, receiving a downlink traffic indication response to determine if it should monitor the channel, allowing it to transition to a sleep mode when no traffic is scheduled, thus conserving resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously monitors the channel for transmission opportunities, then it can detect downlink traffic in time, but power consumption and resource usage increase
Solution Approach 1:
The base station performs preliminary action by sending a downlink traffic indication before the UE needs to monitor the channel. This indication informs the UE about upcoming downlink traffic, allowing the UE to enter sleep mode during periods without scheduled traffic while still maintaining reliable detection capability when traffic is announced in advance.
Solution Approach 2:
The system implements feedback mechanism where the base station monitors UE power saving status and adjusts downlink traffic indication timing and frequency accordingly. This feedback loop allows the system to optimize between reliable traffic detection and power consumption by adapting the indication strategy based on actual UE conditions.
2Use of energy by moving object
If the UE enters sleep mode to save power, then power consumption decreases, but channel monitoring efficiency deteriorates
Solution Approach 1:
The base station sends downlink traffic indications in advance before the UE would need to wake up to monitor. This preliminary notification allows the UE to maintain sleep mode longer while still being informed of upcoming traffic, thus preserving both power savings and monitoring efficiency without requiring continuous active monitoring.
3Reliability
If the UE monitors the channel continuously, then downlink traffic is not missed, but resource usage increases
Solution Approach 1:
The base station performs preliminary action by announcing downlink traffic through downlink traffic indications before the UE needs to allocate monitoring resources. This allows the UE to concentrate its monitoring resources only during announced traffic periods rather than continuously, reducing overall resource usage while maintaining reliable reception.
Solution Approach 2:
The system uses feedback to optimize resource allocation by having the base station adjust downlink traffic indication frequency and timing based on UE conditions and channel characteristics, ensuring reliable traffic reception while minimizing unnecessary resource consumption during low-traffic periods.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit a downlink traffic query to a base station based at least in part on an expectation of downlink traffic from the base station over an unlicensed frequency spectrum band and an absence of downlink traffic from the base station over the unlicensed frequency spectrum band for a threshold duration of time. The UE may receive a downlink traffic indication response from the base station based at least in part on the downlink traffic query. The UE may monitor the unlicensed frequency spectrum band based at least in part on the downlink traffic indication response.