Uplink Control Channel Power Control for Carrier Aggregation
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Solution Overview
Problem
In LTE systems, the existing PUCCH formats are inadequate for efficiently transmitting acknowledgment information for a large number of component carriers, leading to difficulties in controlling uplink control channel transmission power when the number of configured carriers exceeds five.
Innovation Solution
A new PUCCH format is introduced that adjusts transmission power based on the number of resource blocks and payload, including CRC bits, to ensure accurate power control for uplink control channels when six or more component carriers are configured.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of component carriers is expanded to six or more, then the carrier aggregation capacity is improved, but the existing PUCCH formats become inadequate for transmitting acknowledgment information
Solution Approach 1:
The patent introduces a dynamic approach by making the PUCCH format selectable rather than fixed. The system can dynamically choose between first PUCCH format (for 5 or fewer CCs) and second PUCCH format (for 6 or more CCs) based on the number of configured component carriers, allowing the system to adapt to different aggregation scenarios without being constrained by a single format design
2Productivity
If a new PUCCH format is introduced for six or more component carriers, then the acknowledgment information transmission capability is improved, but the transmission power control becomes difficult
Solution Approach 1:
The patent applies parameter changes by modifying the transmission power control mechanism to account for the new PUCCH format characteristics. Specifically, it adjusts the power control parameters (such as P0_PUCCH and delta values) to match the different resource block structure and payload characteristics of the second PUCCH format, thereby maintaining accurate power control despite the format change
Solution Approach 2:
The patent implements feedback mechanisms where the base station provides power control commands (TPC commands) to the user terminal based on the received PUCCH signal quality. This closed-loop feedback allows the system to continuously adjust and optimize the transmission power for the new PUCCH format, ensuring reliable operation while managing power consumption
3Reliability
If existing PUCCH formats are used for five or fewer component carriers, then the transmission power control is maintained, but the system cannot support expansion to six or more component carriers
Solution Approach 1:
The patent segments the PUCCH format selection based on the number of component carriers. It divides the configuration space into two distinct segments: one for 5 or fewer CCs using the first PUCCH format, and another for 6 or more CCs using the second PUCCH format. This segmentation allows each format to be optimized for its specific range while maintaining overall system reliability and flexibility
Data Source
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Figure 3A~3B
AI summary
The present invention is designed so that it is possible to adequately control the transmission power of uplink control channels even when the number of component carriers (CCs) that can be configured per user terminal is expanded more than in existing systems. According to the present invention, a user terminal has a transmission section that transmits an uplink control channel, and a control section that controls the transmission power of the uplink control channel, and the control section controls the transmission power of the uplink control channel based on at least one of the number of resource blocks constituting the format of the uplink control channel and the payload in the format including the cyclic redundancy check (CRC) bits.