Subframe Configuration for Licensed-Unlicensed Carrier Aggregation
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting and receiving wireless signals, particularly in Carrier Aggregation-based systems, where efficient utilization of licensed and unlicensed bands is challenging due to interference and resource management limitations.
Innovation Solution
A method and apparatus that configure a primary cell in a licensed band and a secondary cell in an unlicensed band, using resource configuration information from the primary cell's Physical Downlink Control Channel to set up a subframe configuration on the secondary cell for temporary periods, allowing efficient communication with the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is used to combine licensed and unlicensed bands, then communication capacity is improved, but interference management and resource allocation complexity increase
Solution Approach 1:
The patent divides the carrier aggregation system into distinct components: a primary cell (PCell) operating in licensed band and secondary cells (SCells) operating in unlicensed bands. This segmentation allows independent resource management and interference handling for each cell type, reducing overall system complexity while maintaining high communication capacity through aggregated bandwidth
Solution Approach 2:
The patent introduces a subframe configuration mechanism that acts as an intermediary between the PCell and SCells. The PCell provides control signaling and resource allocation information that mediates the operation of SCells, enabling coordinated resource management across licensed and unlicensed bands without direct complex interactions between all cells
2Productivity
If subframe configuration is set up for temporary periods on SCell, then resource utilization efficiency is improved, but signaling overhead increases
Solution Approach 1:
The patent implements periodic subframe configurations on SCells where resources are allocated in temporary time periods rather than continuously. This periodic activation allows the system to efficiently utilize resources only when needed, improving resource utilization efficiency while the periodic nature enables predictable signaling patterns that reduce overall overhead compared to continuous configuration
Solution Approach 2:
The patent establishes subframe configurations in advance through RRC signaling and PDCCH indications before actual data transmission occurs. This preliminary configuration allows the system to prepare resource allocations ahead of time, improving resource utilization efficiency by avoiding last-minute signaling while reducing real-time overhead through pre-negotiated parameters
Data Source
AI summary
The present invention relates to a wireless communication system, specifically to a method comprising the steps of configuring a PCell of a licensed band and an SCell of an unlicensed band for a base station; receiving resource configuration information concerning the SCell by means of a physical downlink control channel (PDCCH) of the PCell; configuring a subframe set within a temporary time duration on the SCell on the basis of the resource configuration information; and communicating with the base station by means of the subframe set temporarily configured on the SCell, and to an apparatus for the method.