Hybrid Duplex Communication Configuring Special Sub-frames for FDD-TDD Flexibility
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Solution Overview
Problem
Current wireless communication systems are limited by the inability to flexibly combine Frequency Division Duplex (FDD) and Time Division Duplex (TDD) modes, restricting spectrum performance and usage efficiency.
Innovation Solution
A hybrid duplex communication method that configures special sub-frames on carriers to enable flexible switching between FDD and TDD modes, allowing for simultaneous use of frequency division duplex and time division multiplexing, with configuration information obtained and sounding reference symbols sent to optimize communication modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If FDD mode is used separately, then frequency resources are dedicated for UL and DL communication, but the system cannot flexibly combine with TDD mode, restricting spectrum performance and usage efficiency
Solution Approach 1:
The patent merges FDD and TDD modes into a hybrid duplex communication system where a first carrier operates in FDD mode and a second carrier operates in TDD mode, allowing the system to simultaneously utilize the advantages of both modes and flexibly adapt to different service requirements while improving spectrum usage efficiency
Solution Approach 2:
The hybrid duplex communication system provides multi-functionality by supporting both FDD and TDD operations within the same network infrastructure, enabling the system to serve diverse service types (e.g., voice, data, broadcasting) on different carriers according to their specific requirements
2Measurement precision
If special sub-frames are configured on the first carrier, then sounding reference symbols can be sent for channel estimation, but the frame structure becomes more complex
Solution Approach 1:
The patent segments the first carrier into normal sub-frames and special sub-frames, where special sub-frames are specifically designated for sending sounding reference symbols. This segmentation allows channel estimation to be performed only when necessary without requiring complex modifications to the entire frame structure
Solution Approach 2:
The patent configures special sub-frames in advance with predetermined structures for sending sounding reference symbols. This preliminary configuration simplifies the overall system design by establishing clear rules for when and how channel estimation should be performed, reducing the need for complex real-time decision-making
Data Source
AI summary
The present disclosure provides a hybrid duplex communication method and apparatus. Configuration information is obtained. The configuration information includes locations of special sub-frames on the first carrier, and a transmission direction of each sub-frame on the second carrier. Sounding Reference Symbol (SRS) is sent on a special sub-frame. when all sub-frames on the second carrier are UL sub-frames, the UE may communicate with the BS on the first carrier and the second carrier according to the FDD mode; when the second carrier is used for UL and DL transmission in time division multiplexing mode, the UE may communicate with the BS on DL resources of the first carrier and UL resources of the second carrier according to the FDD mode, and/or, the UE may communicate with the BS on DL resources of the second carrier and UL resources of the second carrier according to the TDD mode.