Carrier Aggregation with Different TDD Configurations
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Solution Overview
Problem
Current wireless communication systems face challenges in supporting carrier aggregation with different Time Division Duplex (TDD) configurations, leading to limitations in data throughput and transmit power efficiency, especially when coexisting with TD-SCDMA systems and requiring flexible aggregation across various frequency bands.
Innovation Solution
The proposed solution involves supporting carrier aggregation with different TDD configurations by using multiple radio frequency (RF) transceiver modules, specifying band combination indications, and implementing HARQ feedback mechanisms to manage simultaneous and non-simultaneous DL/UL transceiving, along with CQI/RLM/RRM measurement and UE capability signaling to optimize TDD configurations for enhanced data throughput and power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation with different TDD configurations is not supported, then system complexity is reduced, but data throughput and power efficiency are limited
Solution Approach 1:
The system segments the carrier aggregation functionality by introducing separate configuration mechanisms for primary and secondary cells. Each cell can have independent TDD configurations, allowing the system to handle multiple configurations simultaneously without requiring complete system redesign. This segmentation enables flexible aggregation while maintaining manageable complexity through modular configuration management.
2Use of energy by moving object
If flexible aggregation across frequency bands is implemented, then power efficiency is improved, but interference management becomes more difficult
Solution Approach 1:
The system applies local quality by allowing different TDD configurations for different frequency bands and cells. Each band can be optimized independently for its specific traffic requirements, with primary cells and secondary cells having different UL/DL ratios. This localized configuration approach enables power efficiency optimization per band while managing interference through configuration isolation.
3Adaptability or versatility
If TD-LTE coexists with TD-SCDMA, then system versatility is improved, but configuration constraints increase
Solution Approach 1:
The system introduces an intermediary configuration mechanism where the primary cell's TDD configuration serves as a reference that can influence secondary cell configurations. This intermediary approach allows TD-LTE to coexist with TD-SCDMA by providing a coordination layer that manages configuration constraints, enabling versatile deployment while maintaining manageable complexity through hierarchical configuration management.
Data Source
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AI summary
Systems and Methods for supporting carrier aggregation with different TDD configurations are proposed. In a first novel aspect, corresponding apparatus structure is described. In a second novel aspect, aggregation constraint is discussed. In a third novel aspect, transceiving mechanisms over multiple component carriers in DL/UL overlapped subframes are proposed. For simultaneous DL/UL transceiving, band combination indication methods are proposed, and HARQ feedback mechanisms are proposed. For non-simultaneous DL/UL transceiving, transceiving configuration methods are proposed, and the same HARQ feedback mechanisms are proposed. In a fourth novel aspect, CQI/RLM/RRM measurement mechanisms are proposed. In a fifth novel aspect, UE capability signaling mechanisms are proposed. The objective is to support flexible aggregation, to enhance DL data throughout, and to improve UL transmit power efficiency.