PUCCH SCell Activation for Carrier Aggregation Load Distribution
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Solution Overview
Problem
In wireless communication systems, the load on specific cells increases when performing carrier aggregation (CA) or dual connectivity (DC), leading to inefficient data processing and potential errors in channel state information transmission due to the reliance on a single cell for uplink control information.
Innovation Solution
A method and device that configure carrier aggregation using a single primary cell and multiple secondary cells, where the physical uplink control channel (PUCCH) transmission function is activated in at least one secondary cell, allowing channel state information to be transmitted and received efficiently, thereby reducing the load on specific cells and preventing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uplink control information is transmitted through a single cell (PCell or PSCell) for each base station, then the system maintains simple cell structure and control signaling, but the load on that specific cell increases with the number of aggregated cells, causing inefficient data processing
Solution Approach 1:
The patent segments the uplink control information transmission function from a single cell to multiple cells. Specifically, it divides the transmission of different types of uplink control information (HARQ-ACK, CSI, SR) across different cells based on their priorities and channel conditions, thereby distributing the load and improving data processing efficiency while maintaining manageable cell structures through organized segmentation of control signaling functions
Solution Approach 2:
The patent introduces a new dimension for load distribution by utilizing multiple cells simultaneously for uplink control information transmission. Instead of concentrating all control signaling in one cell (single-dimensional approach), the system distributes control information across multiple cells in the frequency and spatial domains, effectively adding dimensional diversity to handle increased traffic loads from carrier aggregation
2Quantity of substance
If multiple cells are aggregated through carrier aggregation or dual connectivity, then the data transmission capacity increases, but the load on the cell responsible for uplink control information transmission increases, leading to potential errors in channel state information transmission
Solution Approach 1:
The patent applies local quality by assigning different transmission characteristics to different cells based on their specific conditions. High-priority control information like HARQ-ACK is transmitted through cells with reliable uplink channels, while CSI and SR can be transmitted through cells with adequate channel conditions. This localized optimization of transmission quality based on individual cell characteristics maintains reliability while supporting multiple aggregated cells
Solution Approach 2:
The patent implements beforehand cushioning by establishing multiple redundant transmission paths for uplink control information before transmission occurs. By pre-configuring multiple cells capable of transmitting control information and defining fallback mechanisms, the system cushions against potential transmission errors in any single cell, thereby maintaining channel state information transmission reliability even as data transmission capacity increases through carrier aggregation
Data Source
AI summary
Provided are a method and a device for transmitting channel state information by using a PUCCH of an SCell when providing carrier aggregation (CA) or dual connectivity (DC) in a E-UTRAN. The method may include: configuring a carrier aggregation by using one primary cell (PCell) and a plurality of secondary cells (SCells) controlled by a base station; receiving an upper layer signaling including configuration information for configuring a physical uplink control channel (PUCCH) transmission function in at least one cell among the plurality of secondary cells; receiving, by using the configuration information, a MAC control element in which activation state indication information for a PUCCH SCell having an uplink control channel transmission function is included; and transmitting channel state information on the PUCCH SCell after the PUCCH SCell is activated according to the activation state indication information.