Uplink Control Information Transmission in Carrier Aggregation
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Solution Overview
Problem
Current LTE systems face inefficiencies in transmitting uplink control information, particularly in managing multiple serving cells and channel allocation, which affects the processing time and channel state information transmission.
Innovation Solution
The terminal apparatus and base station apparatus implement a method for efficient uplink control information transmission by utilizing carrier aggregation, channel state information reporting, and selective channel usage based on parameters like cell index, transmission length, and uplink grant fields, allowing for simultaneous transmission on multiple channels and efficient resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink control information is transmitted on both PUCCH and PUSCH simultaneously in carrier aggregation, then the reliability of control information transmission is improved, but the device complexity and processing overhead increase
Solution Approach 1:
The patent implements dynamic channel selection based on real-time conditions. The terminal determines whether to transmit UCI on PUCCH, PUSCH, or both channels by evaluating parameters such as uplink grant reception, PUSCH transmission presence, and carrier aggregation configuration. This dynamic approach allows the system to adapt transmission reliability to actual channel conditions and resource availability, achieving high reliability only when necessary while reducing complexity in other scenarios
Solution Approach 2:
The patent changes transmission parameters based on specific conditions. When an uplink grant is received or PUSCH transmission is present on the primary cell, the terminal switches to transmitting UCI only on PUSCH. Otherwise, it uses PUCCH transmission. This parameter switching mechanism resolves the contradiction by adjusting transmission mode according to system state, maintaining reliability when needed while minimizing complexity overhead
2Reliability
If uplink control information is transmitted on PUCCH, then the control information transmission is reliable, but the processing time increases due to sequential handling
Solution Approach 1:
The patent merges UCI transmission with uplink data transmission on PUSCH. When PUSCH transmission is present on the primary cell, the terminal combines control information with data transmission in the same channel, eliminating the need for separate PUCCH transmission. This merging approach simultaneously achieves reliable control information delivery and reduces processing time by handling both data and control in a unified transmission process
3Productivity
If carrier aggregation is used for uplink control information transmission, then the transmission efficiency is improved, but the channel allocation complexity increases
Solution Approach 1:
The patent segments the carrier aggregation system into primary cell and secondary cell functions. The primary cell handles PUCCH transmission and uplink grant reception, while secondary cells focus on data transmission. This segmentation simplifies channel allocation by establishing clear functional boundaries, allowing efficient UCI transmission across aggregated carriers without requiring complex coordination mechanisms for each cell
4Productivity
If simultaneous transmission on multiple channels is implemented, then the uplink control information throughput is improved, but the resource allocation overhead increases
Solution Approach 1:
The terminal autonomously determines the appropriate transmission channel based on pre-defined criteria without requiring complex base station scheduling for each UCI transmission. The device evaluates local conditions such as PUSCH presence and uplink grant reception to self-select the transmission mode, reducing resource allocation overhead while maintaining high throughput through appropriate channel selection
Data Source
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AI summary
Uplink control information can be efficiently transmitted. A terminal apparatus (1) receives an uplink grant used for scheduling of a PUSCH in a serving cell and an uplink grant used for scheduling of a sPUSCH in the serving cell, transmits a periodic channel state information report by using the PUCCH in the serving cell, and in a case that transmission of the sPUSCH occurs in a subframe in which transmission of the periodic channel state information report by using the PUCCH has already started, stops the transmission of the PUCCH already started. According to the present invention, the terminal apparatus (1) can efficiently transmit the uplink control information. The base station apparatus (3) can efficiently receive the uplink control information.