LTE-A Uplink Control Information Transmission Strategy
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Solution Overview
Problem
In LTE Advanced systems, there is a need for efficient methods to transmit uplink control information (UCI) and manage power issues that arise when using multiple uplink channels, particularly due to increased UCI sizes and higher volumes of data.
Innovation Solution
The proposed solution involves determining whether to transmit UCI bits on the Physical Uplink Control Channel (PUCCH) or the Physical Uplink Shared Channel (PUSCH) based on the number of bits and power thresholds, allowing for simultaneous transmission on both channels when necessary, and adjusting power settings to comply with maximum power limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UCI bits are transmitted on both PUCCH and PUSCH simultaneously, then the reliability of UCI transmission is improved, but the power consumption increases and may exceed maximum power limits
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the UCI transmission strategy based on the calculated power budget. When power headroom is sufficient, UCI is transmitted on both PUCCH and PUSCH for enhanced reliability. When power headroom is insufficient, the patent changes the transmission parameters to send UCI only on PUSCH or only on PUCCH, thereby adapting the transmission mode to current power conditions while maintaining reliable communication.
Solution Approach 2:
The patent implements dynamics by making the UCI transmission mode flexible and adaptive rather than fixed. The system dynamically selects between three transmission modes (both PUCCH and PUSCH, PUSCH only, or PUCCH only) based on real-time power headroom calculations and channel conditions, allowing the transmission strategy to adapt to changing system conditions and optimize both reliability and power efficiency.
2Use of energy by moving object
If UCI bits are transmitted on PUCCH only, then the power consumption is reduced, but the capacity to handle increased UCI sizes is limited
Solution Approach 1:
The patent applies segmentation by dividing the UCI transmission across two different channels (PUCCH and PUSCH) that can be used simultaneously. This allows the UCI payload to be segmented and transmitted on both channels in parallel, thereby increasing the overall capacity to handle large UCI sizes while distributing the power consumption across different transmission resources rather than overloading a single channel.
Solution Approach 2:
The patent utilizes the multi-functionality of having both PUCCH and PUSCH available for UCI transmission. The system can selectively use either channel or both channels depending on the UCI payload size and power conditions, making the transmission system universal and adaptable to various UCI capacity requirements while managing power consumption efficiently.
3Device complexity
If UCI bits are transmitted on PUSCH only, then the device complexity is reduced, but the reliability of control information transmission is compromised
Solution Approach 1:
The patent introduces an intermediary mechanism in the form of a power headroom calculation and decision-making process that determines whether to use PUSCH only, PUCCH only, or both channels. This intermediary layer manages the complexity by providing a systematic method to select the appropriate transmission mode based on power conditions and UCI characteristics, thereby simplifying the overall decision process while maintaining high reliability through adaptive mode selection.
4Adaptability or versatility
If independent power settings are used for uplink channels, then the flexibility in power management is improved, but the coordination between PUCCH and PUSCH power becomes complex
Solution Approach 1:
The patent applies feedback by using the power headroom calculation as a feedback mechanism to guide UCI transmission decisions. The system calculates the available power headroom based on current power settings and uses this feedback information to determine the appropriate UCI transmission mode. This feedback loop enables flexible power management while coordinating PUCCH and PUSCH power settings systematically, reducing the complexity of independent power control by providing a clear decision-making framework based on real-time power conditions.
Data Source
AI summary
Methods and systems for transmitting uplink control information in an LTE Advanced system are disclosed. A user device may determine whether uplink control information and/or available channels meet certain criteria and determine whether the uplink control information should be transmitted on a physical uplink control channel, a physical uplink shared channel, or both, based on the criteria. Criteria may include the size of the uplink control information (absolute size or relative to space available on a channel or a threshold value), the type of control information bits, the number of available (i.e., active or configured) component carriers, and the amount of power that may be required to transmit the uplink control information on more than one channel.