Bandwidth Part Switching in Unlicensed Bands After LBT Failure
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Solution Overview
Problem
Existing technologies face challenges in efficiently managing bandwidth parts and carrier aggregation in multicarrier communication systems, particularly in unlicensed bands, leading to suboptimal resource utilization and inefficient network operations.
Innovation Solution
The implementation of bandwidth part activation/deactivation and switching mechanisms in multicarrier communication systems, utilizing MAC commands for dynamic control of logical channels and timing advance groups, along with advanced modulation schemes like QAM, BPSK, and QPSK, to optimize resource allocation and network performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If bandwidth parts are dynamically activated and deactivated in unlicensed bands, then resource utilization is optimized and network efficiency is enhanced, but system complexity increases due to additional control mechanisms
Solution Approach 1:
The patent implements dynamic activation and deactivation of bandwidth parts based on channel conditions and traffic demands. The system transitions from static bandwidth configuration to dynamic adaptation, allowing the network to adjust bandwidth resources in real-time. This resolves the contradiction by enabling improved network efficiency through dynamic resource allocation while managing complexity through standardized control procedures defined in 3GPP specifications.
Solution Approach 2:
The patent changes operational parameters of bandwidth parts including activation status, bandwidth width, and timing advance values. By modifying these parameters dynamically, the system optimizes resource utilization without requiring complete system redesign. The parameter change approach allows fine-tuned control of bandwidth parts while maintaining manageable system complexity through incremental adjustments.
2Quantity of substance
If carrier aggregation is implemented with multiple bandwidth parts, then data transmission capacity is increased, but latency increases due to additional switching operations
Solution Approach 1:
The patent configures multiple bandwidth parts and carrier aggregation settings in advance through RRC signaling, so that when data transmission is needed, the system can quickly activate appropriate bandwidth parts without lengthy configuration delays. This preliminary configuration enables high data transmission capacity while minimizing latency during actual data flow.
Solution Approach 2:
The patent replaces manual bandwidth switching with automated MAC layer control mechanisms that dynamically select and switch between bandwidth parts based on real-time conditions. This substitution of control mechanisms reduces switching latency while maintaining the ability to aggregate multiple carriers for high capacity transmission.
3Adaptability or versatility
If dynamic control mechanisms are added for bandwidth part management, then resource allocation is optimized, but device complexity increases
Solution Approach 1:
The patent designs bandwidth part control mechanisms that serve multiple functions: activation, deactivation, switching, and resource allocation. By making the control system multi-functional, the patent achieves optimized resource allocation flexibility without proportionally increasing complexity. The same control framework handles various bandwidth management tasks, reducing the need for separate specialized mechanisms.
Data Source
AI summary
A wireless device receives one or more messages comprising a parameter indicating a first value of a listen before talk (LBT) counter. The LBT counter is incremented based on an LBT procedure indicating an LBT failure for an uplink transmission via a first bandwidth part. Based on the LBT counter reaching the first value, a switch is made from the first bandwidth part to a second bandwidth part as an active bandwidth part.