Uplink Control Information Transmission for Carrier Aggregation
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Solution Overview
Problem
Current mobile communication systems face challenges in efficiently transmitting uplink control information across multiple serving cells, particularly in non-ideal backhaul environments where backhaul delay occurs, leading to difficulties in smooth HARQ operation and radio channel-based scheduling.
Innovation Solution
A method where User Equipment (UE) compares the number of uplink control information (UCIs) to be transmitted with the number available for simultaneous transmission, selects and transmits a subset of UCIs through the Physical Uplink Control Channel (PUCCH) of each serving cell, allowing independent transmission of uplink control information for each serving cell, and the Base Station receives these UCIs, determining which ones to prioritize based on Carrier Indicator Field (CIF) values or priority settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink control information is transmitted across multiple serving cells simultaneously, then data transmission rate is improved, but transmission reliability deteriorates due to backhaul delay in non-ideal environments
Solution Approach 1:
The patent segments uplink control information into multiple independent parts, each transmitted on a different serving cell through separate PUCCH resources. This allows parallel transmission across multiple cells to increase throughput while maintaining independent error protection for each segment, thereby resolving the contradiction between transmission rate and reliability in non-ideal backhaul conditions.
2Productivity
If the number of simultaneously transmitted UCIs is increased, then communication efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic control of the number of simultaneously transmitted UCIs based on the parameter M, which can be flexibly configured. The system dynamically adjusts transmission parameters including the number of active serving cells, PUCCH resources, and UCI multiplexing strategies according to channel conditions and backhaul quality, thereby improving communication efficiency while adapting device complexity to actual operational needs rather than requiring maximum capability in all conditions.
3Adaptability or versatility
If independent UCI transmission for each serving cell is implemented, then adaptability is improved, but interference between cells increases
Solution Approach 1:
The patent applies local quality by configuring different transmission parameters for different serving cells based on their specific characteristics. Each cell can have independently configured PUCCH resources, modulation schemes, and power levels. This allows the system to adapt to local channel conditions and backhaul quality on each cell while managing interference through cell-specific optimization rather than uniform transmission across all cells.
Solution Approach 2:
The patent introduces the Base Station as an intermediary that coordinates UCI transmission across multiple serving cells. The Base Station manages resource allocation, determines which UCIs to transmit on which cells based on overall system state, and controls the parameter M that limits simultaneous transmissions. This intermediary coordination enables adaptability while preventing excessive interference that would result from completely independent cell operations.
Data Source
AI summary
The present disclosure relates a method and apparatus for transmitting uplink control information on a plurality of serving cells for supporting carrier aggregation technology between base stations. The method of a user equipment may include comparing a number K of Uplink Control Informations (UCIs) to be simultaneously transmitted and a number M of UCIs available for simultaneous transmission and selecting M UCIs from UCIs to be simultaneously transmitted when the number K is greater than the number M and transmitting, to a Base Station (BS), the selected M UCIs through a Physical Uplink Control CHannel (PUCCH) of each serving cell. The number M is less than or equal to the N, and the number M is a natural number greater than or equal to 1.