eCC Activation Signaling for Unlicensed Carrier Access
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Solution Overview
Problem
Devices in wireless communication systems expend significant resources monitoring unlicensed frequency spectrum for channel availability, leading to inefficient power usage and resource wastage due to indiscriminate listening.
Innovation Solution
Implementing a mechanism where a primary carrier signals channel availability on a secondary carrier, allowing for fast enhanced component carrier (eCC) activation through control signals, thereby reducing unnecessary monitoring and conserving resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices continuously monitor unlicensed frequency spectrum for channel availability, then channel access reliability is improved, but power consumption increases
Solution Approach 1:
The base station performs preliminary channel availability determination and transmits indication information to the UE before the UE needs to access the channel. This allows the UE to avoid continuous monitoring and only activate monitoring when the channel is confirmed available, thereby maintaining reliability while reducing power consumption.
Solution Approach 2:
The base station provides feedback to the UE about channel availability status through indication information transmitted on control channels. This feedback mechanism allows the UE to adjust its monitoring behavior based on current channel conditions, ensuring reliable access while minimizing unnecessary power expenditure during channel unavailable periods.
2Measurement precision
If devices monitor unlicensed frequency spectrum continuously, then channel availability detection accuracy is improved, but resource wastage increases
Solution Approach 1:
The base station performs preliminary channel assessment and transmits availability indication to the UE in advance. This eliminates the need for the UE to continuously monitor the channel, maintaining detection accuracy when needed while avoiding resource wastage during periods when the channel is unavailable or not intended for UE access.
Solution Approach 2:
The base station serves itself by performing channel availability determination and then providing this information to UEs. This self-service approach allows the system to maintain accurate channel detection without requiring each UE to independently and continuously monitor the spectrum, thereby reducing overall resource wastage while preserving detection accuracy.
3Speed
If UE activates eCC monitoring quickly upon channel availability indication, then activation speed is improved, but false activation due to channel occupancy may occur
Solution Approach 1:
The base station acts as an intermediary between the unlicensed channel and the UE. It performs channel availability determination and transmits indication information to the UE, serving as a mediator that filters out false activation scenarios. The UE trusts the base station's assessment, enabling fast activation while maintaining reliability through the base station's intermediary verification.
Solution Approach 2:
The base station provides feedback to the UE about channel availability status before the UE activates eCC monitoring. This feedback mechanism ensures that the UE only activates when the channel is truly available, preventing false activation while maintaining fast activation speed through immediate notification upon channel availability.
Data Source
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Figure 3A~3B
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may be configured for carrier aggregation (CA) operation. The CA configuration may include multiple component carriers (CCs), including an enhanced component carrier (eCC). One CC of the CA configuration may be employed to signal channel availability of another CC of the CA configuration. For instance, a primary CC that utilizes licensed frequency bandwidth may signal channel availability of an eCC that utilizes unlicensed frequency bandwidth. This indication of channel availability may be sent before or after a clear channel assessment (CCA). Additionally, the indication of channel availability may be employed in both self- and cross-carrier scheduling configurations.