LAA Feedback Information Length Determination
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Solution Overview
Problem
In LTE systems using License Assisted Access (LAA), the base station lacks knowledge of the specific subframe for unlicensed carrier data transmission, leading to uncertainty in scheduling conditions and reduced efficiency of feedback information transmission between the base station and terminal equipment.
Innovation Solution
The base station and terminal equipment predetermine a method to determine the length of feedback information for unlicensed carriers, such as based on the number of PDSCHs received or the maximum carrier index, allowing the base station to set appropriate information fields in DCI for ACK/NACK feedback, thereby increasing transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the base station uses LAA technology to aggregate unlicensed carriers, then bandwidth extension is achieved, but the base station cannot determine the specific subframe for data transmission on unlicensed carriers, leading to uncertainty in scheduling conditions and reduced feedback information transmission efficiency
Solution Approach 1:
The base station and terminal equipment predetermine a method to determine the length of feedback information for unlicensed carriers before actual data transmission. This preliminary agreement on feedback information length determination allows the base station to efficiently allocate resources and manage feedback without real-time scheduling uncertainty, thus maintaining high feedback transmission efficiency while using unlicensed carriers for bandwidth extension
2Adaptability or versatility
If the base station cannot set information in DCI to indicate the amount of feedback information required, then LAA technology can be implemented, but feedback information transmission efficiency is reduced
Solution Approach 1:
The base station and terminal equipment establish a predetermined method for determining feedback information length in advance, enabling the base station to efficiently manage feedback resources without needing to indicate the exact amount of feedback information in each DCI message, thus reducing feedback transmission time while maintaining carrier aggregation flexibility
Solution Approach 2:
The terminal equipment autonomously determines the length of feedback information based on predetermined rules (such as based on the number of PDSCHs received or the maximum carrier index) without requiring explicit indication from the base station, allowing the system to maintain adaptability while reducing signaling overhead and transmission time
Data Source
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AI summary
The disclosure discloses a method for transmitting feedback information, terminal equipment and a base station. The method includes that the terminal equipment receives signaling indicative of Physical Uplink Control Channel (PUCCH) resource(s) from the base station, receives data on licensed carrier(s) and unlicensed carrier(s) which are aggregated, and after generating the feedback information, transmits the feedback information to the base station through the corresponding PUCCH resource(s). The problem that the base station in a License Assisted Access (LAA) system may not know about the feedback information transmitted by the terminal equipment may be solved, thereby increasing efficiency of feedback information transmission.