PUCCH Format 3 Power Control for Carrier Aggregation
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Solution Overview
Problem
In LTE systems employing carrier aggregation and TDD, managing the transmission of uplink control-channel information, particularly for simultaneous reporting of channel-state information and hybrid-ARQ ACK/NACK bits for multiple downlink carriers, is challenging due to the need for efficient power control and resource allocation to ensure reliable communication.
Innovation Solution
The use of PUCCH Format 3 structure for simultaneous reporting of channel-state information and hybrid-ARQ ACK/NACK bits, with a power control offset parameter calculated as a linear function of the number of HARQ and CSI bits, allows for efficient transmission on a single uplink carrier, optimizing power control and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple ACK/NACK bits and CSI bits are transmitted simultaneously in a single uplink subframe using carrier aggregation, then the data transmission capacity is improved, but the power control complexity and resource allocation difficulty increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the power control offset parameter based on the number of ACK/NACK bits and CSI bits to be transmitted. The offset parameter is modified according to the total payload size, allowing the system to adapt power allocation to the actual data transmission requirements, thereby managing power control complexity while supporting high-capacity simultaneous transmission.
Solution Approach 2:
The patent implements dynamics by making the power control mechanism adaptive rather than static. The power control offset is dynamically calculated based on real-time parameters including the number of ACK/NACK bits, CSI bits, and transmission conditions. This dynamic adjustment allows the system to optimize power distribution for each transmission instance, handling variable payload sizes efficiently.
2Productivity
If a single uplink carrier is used to carry ACK/NACK and CSI for multiple downlink carriers, then resource allocation efficiency is improved, but the reliability of control signaling transmission deteriorates
Solution Approach 1:
The patent uses parameter changes to adjust the power control offset based on the total number of control bits (ACK/NACK + CSI) being transmitted on the single uplink carrier. By dynamically modifying the offset parameter according to payload size and transmission conditions, the system maintains reliable transmission even when consolidating multiple control signals on one carrier, compensating for the increased burden on that single carrier.
3Productivity
If the power control offset parameter is calculated as a linear function of the number of HARQ and CSI bits, then power control efficiency is improved, but the accuracy of power allocation may deteriorate
Solution Approach 1:
The patent employs parameter changes by using a linear function to calculate the power control offset based on the number of HARQ and CSI bits. This linear relationship provides computational efficiency while the patent further refines accuracy by incorporating additional parameters such as transmission power, path loss, and modulation and coding scheme (MCS) information into the overall power control calculation, balancing efficiency and precision.
Data Source
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AI summary
Channel-state information and hybrid-ARQ ACK/NACK information for multiple carriers are simultaneously transmitted using a PUCCH Format 3 structure, where the hybrid-ARQ ACK/NACK bits and CSI bits are separately encoded and interleaved. In an example method, a power control offset parameter is calculated (2110) as a linear combination of at least a number N, representing a number of channel-state information bits and a number M, representing a number of hybrid-ARQ ACK/NACK bits. The method continues with the calculating (2120) of a power level for a transmission on a physical uplink control channel (PUCCH), using the power control offset parameter. In some embodiments, encoded channel-state information and hybrid- ARQ ACK/NACK bits are then transmitted (2060) according to the calculated power level. In some embodiments, the linear combination is of the form aN + bM + c, where a, b, and c are non-zero constants.