Uplink Control Information Channel Selection for Power-Constrained UEs
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently selecting uplink channels for transmitting control information, particularly in managing acknowledgement/negative acknowledgement (ACK/NACK) and channel state information (CSI) across different channels, due to limitations in transmit power and scheduling constraints.
Innovation Solution
User Equipment (UE) determines the optimal channels for concurrent transmission of control and shared channels based on the type of control information, current configuration, scheduling, and available power, allowing for flexible selection between Physical Uplink Control Channel (PUCCH) and Physical Uplink Shared Channel (PUSCH) to ensure effective data and control information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits both control channel and shared channel concurrently, then the transmission capacity and system efficiency are improved, but the transmit power requirements increase and may exceed device limitations
Solution Approach 1:
The patent applies dynamics by making the transmission mode flexible and adaptable. The UE can dynamically switch between PUCCH-only mode, PUSCH-only mode, or concurrent PUCCH-PUSCH mode based on real-time conditions including available transmit power, scheduling requirements, and control information types. This dynamic adaptation allows the system to optimize between transmission capacity and power consumption constraints.
2Reliability
If the UE selects PUCCH for control information transmission, then the control information reliability is improved, but the shared channel data transmission capacity is reduced
Solution Approach 1:
The patent applies segmentation by separating control information transmission from data transmission into distinct channels (PUCCH and PUSCH). This allows control information to be transmitted reliably on PUCCH while data transmission occurs on PUSCH, enabling both high reliability for control signals and high capacity for data simultaneously. The system can segment the transmission tasks based on priority and requirements.
Solution Approach 2:
The patent applies merging by allowing the UE to combine both PUCCH and PUSCH transmissions in concurrent mode when conditions permit. This merging enables the system to achieve both reliable control information transmission and high data transmission capacity in the same time slot, optimizing overall system productivity while maintaining control reliability through dedicated channel resources.
3Adaptability or versatility
If the UE transmits control information on multiple channels, then the transmission flexibility and system adaptability are improved, but the channel selection complexity increases
Solution Approach 1:
The patent applies parameter changes by establishing clear decision criteria based on configurable parameters such as control information types (ACK/NACK, CSI, SR), available transmit power levels, and scheduling grants. The UE evaluates these parameters to automatically select the optimal transmission mode, transforming a complex multi-channel selection problem into a systematic parameter-based decision process that reduces implementation complexity.
Data Source
AI summary
Techniques for sending control information on uplink channels are disclosed. In one design, a user equipment (UE) may determine its current configuration for concurrent transmission of a control channel and a shared channel. The UE may select one or more channels, from among the control channel and the shared channel, to send control information of at least one type in a same subframe. The UE may select the one or more channels based on the types of control information to send, the current configuration for concurrent transmission of the control channel and the shared channel, whether the UE is scheduled for data transmission on the shared channel in the subframe, whether the UE has sufficient transmit power to transmit both the control channel and the shared channel, etc. The UE may send the control information on the one or more selected channels in the subframe.