DAPS Handover LBT Failure Detection in 5G Unlicensed Bands
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Solution Overview
Problem
In 5G communication systems using the unlicensed band, dual active protocol stack (DAPS) handovers often experience uplink listen-before-talk (LBT) failures due to interference from other devices, leading to communication delays.
Innovation Solution
A method is implemented where a terminal and a base station exchange messages to detect consistent uplink LBT failures, allowing for the suspension of data communication with the source base station and reconfiguration to a target base station, thereby reducing handover delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DAPS handover is configured in unlicensed band, then handover capability is improved, but LBT failure rate increases due to interference from other devices
Solution Approach 1:
The base station detects consistent uplink LBT failures before they cause communication breakdown, using pre-configured detection mechanisms that monitor LBT success rates and trigger handover preparation in advance, preventing complete link failure
2Reliability
If LBT failure detection is implemented during DAPS handover, then communication reliability is improved, but handover delay increases due to additional detection procedures
Solution Approach 1:
The base station performs LBT failure detection and initiates handover preparation in advance, before the communication link completely fails, thereby reducing actual handover execution time while maintaining reliability
Solution Approach 2:
The system continuously monitors LBT failure indicators and uses this feedback to dynamically adjust handover timing, triggering handover when failure thresholds are reached to optimize the balance between reliability and delay
3Loss of time
If consistent uplink LBT failure detection is performed, then handover timing is improved, but system complexity increases due to additional monitoring and message exchange
Solution Approach 1:
The base station uses its existing uplink reception capabilities to detect LBT failures by monitoring whether uplink signals from the terminal are received, turning a passive reception function into an active detection mechanism without adding complex hardware
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method performed by a terminal in a communication system is provided. The method includes receiving, from a first base station, a first message including first information used for detection of consistent uplink listen before talk (LBT) failures for the first base station, receiving, from the first base station, a second message for a handover to a second base station, the second message including second information for a reconfiguration with sync, in case that third information configuring at least one dual active protocol stack (DAPS) bearer is included in the second message and an indication of the consistent uplink LBT failures for the first base station is identified based on the first information while performing a procedure associated with the handover, suspending data communication of all data radio bearers (DRBs) associated with the first base station.