PUCCH Format 3 Simultaneous ACK/NACK and CQI/PMI/RI Transmission
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Solution Overview
Problem
In LTE-A systems, the simultaneous transmission of ACK/NACK and periodic CQI/PMI/RI feedback information is not efficiently supported, leading to the abandonment of periodic CQI/PMI/RI transmission when both types of feedback are sent in the same uplink sub-frame, which reduces feedback efficiency.
Innovation Solution
A method and device for simultaneous transmission of ACK/NACK and periodic CQI/PMI/RI feedback bits using PUCCH format 3, allowing both types of information to be transmitted in one uplink sub-frame, thereby avoiding the need to abandon periodic CQI/PMI/RI transmission and improving feedback efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ACK/NACK feedback information and periodic CQI/PMI/RI feedback bits are transmitted simultaneously in one uplink sub-frame, then feedback efficiency is improved, but the transmission of periodic CQI/PMI/RI is abandoned in existing LTE-A systems
Solution Approach 1:
The patent combines ACK/NACK feedback information and periodic CQI/PMI/RI feedback bits into a single transmission on PUCCH format 3. The UE multiplexes both types of feedback information and transmits them simultaneously in one uplink sub-frame, eliminating the need to choose between the two transmission types and thereby improving overall feedback efficiency.
Solution Approach 2:
PUCCH format 3 is designed to serve multiple functions by accommodating both ACK/NACK feedback and periodic CQI/PMI/RI feedback. This universal format allows the uplink control channel to handle diverse feedback types in a single transmission, enhancing system flexibility and resource utilization.
2Adaptability or versatility
If the number of ACK/NACK feedback bits increases due to carrier aggregation, then more downlink carriers can be supported, but the transmission capacity of existing PUCCH formats becomes insufficient
Solution Approach 1:
The patent changes the transmission parameters by using PUCCH format 3 with DFT-S-OFDM modulation and RM(32, O) block codes, which can accommodate up to 20 feedback information bits. This parameter change enables the system to support carrier aggregation with multiple downlink carriers while maintaining manageable transmission complexity through structured coding and modulation.
3Ease of operation
If PUCCH format 1b with channel selection is used for ACK/NACK transmission, then transmission simplicity is maintained, but the maximum number of transmission bits is limited to 4 bits
Solution Approach 1:
The patent transitions from PUCCH format 1b (which uses channel selection in the frequency domain) to PUCCH format 3 (which uses DFT-S-OFDM modulation in the time domain). This dimensional change enables significantly more bits to be transmitted (up to 20 bits compared to 4 bits) while maintaining operational simplicity through a unified transmission approach that handles both ACK/NACK and CQI/PMI/RI feedback.
Data Source
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AI summary
Disclosed are a method and device for simultaneous transmission of ACK/NACK feedback information and periodic CQI/PMI/RI feedback bits. By way of using the technical solution of the embodiments of the present invention, the periodic CQI/PMI/RI feedback bits and ACK/NACK feedback information can be simultaneously transmitted in the same uplink sub-frame using PUCCH format 3 in an LTE-A system, thus avoiding the situation that the transmission of the periodic CQI/PMI/RI information needs to be abandoned when the ACK/NACK feedback information and the periodic CQI/PMI/RI information are transmitted simultaneously in the same uplink sub-frame, improving the feedback efficiency of the uplink control information.