Carrier Aggregation LBT Grouping for Wireless Data Burst Transmission
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Solution Overview
Problem
Wireless access systems supporting unlicensed bands face inefficiencies in data transmission and carrier aggregation, particularly in performing Listen Before Talk (LBT) operations between Component Carriers (CCs), selecting representative carriers, and managing data bursts across multiple CCs.
Innovation Solution
A method for a base station to select a component carrier, perform a Listen Before Talk (LBT) procedure with random backoff, and transmit data bursts in an idle state, while also sensing and transmitting in other CCs, to efficiently manage data transmission across multiple carriers in an unlicensed band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual LBT operations are performed on each Component Carrier in Carrier Aggregation, then channel access reliability is improved, but transmission delay increases
Solution Approach 1:
The patent combines multiple Component Carriers into carrier groups and performs a single LBT operation for the entire group rather than individual LBT on each carrier. This merging approach maintains reliable channel access by evaluating the group as a unit while significantly reducing the time required compared to sequential individual LBT operations on multiple carriers.
2Productivity
If multiple LBT operations are performed simultaneously on multiple Component Carriers, then data transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments Component Carriers into distinct carrier groups, where each group undergoes a unified LBT operation. This segmentation allows parallel processing of multiple groups simultaneously, improving overall transmission efficiency while keeping the complexity of each individual group's LBT operation manageable and standardized.
3Device complexity
If a representative Component Carrier is selected for LBT operation, then device complexity is reduced, but channel access reliability may deteriorate
Solution Approach 1:
The patent introduces a representative Component Carrier as an intermediary within each carrier group to perform LBT operations on behalf of the entire group. This representative carrier serves as a mediator that simplifies the LBT process by providing a single reference point for channel assessment, reducing device complexity while maintaining reliable channel access through proper group-based evaluation.
Data Source
AI summary
The disclosure describes a method for transmitting a signal in a wireless access system and a device supporting the same. More particular, to carrier sensing methods, specifically methods for performing a channel access procedure (CAP), methods for selecting a representative frequency resource, methods for transmitting a data burst, and devices supporting the same.