Secondary Cell Management Using Distributed PUCCH and Timing Groups
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing multiple secondary cells efficiently, particularly in terms of PUCCH load distribution and timing alignment, leading to suboptimal performance as the number of carriers and capable UEs increase.
Innovation Solution
Implementing multiple PUCCH groups and timing advance groups (TAGs) to distribute PUCCH load across secondary cells, allowing for independent PUCCH transmissions and synchronized uplink timing alignment, thereby optimizing resource utilization and reducing load on primary cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple secondary cells are managed using a single PUCCH group, then the system structure remains simple, but the PUCCH load on primary cells becomes excessive and resource utilization is suboptimal
Solution Approach 1:
The patent divides the PUCCH resources into multiple independent PUCCH groups (first PUCCH group and second PUCCH group), each serving different secondary cells. This segmentation distributes the PUCCH load across multiple groups rather than concentrating it on a single group, thereby increasing overall PUCCH capacity and reducing the burden on primary cells while maintaining manageable complexity through structured organization.
2Reliability
If all secondary cells use the same timing advance group, then the system configuration is simplified, but uplink timing alignment performance deteriorates with increasing number of carriers
Solution Approach 1:
The patent segments the timing advance resources into multiple independent TAGs (first TAG and second TAG), where each TAG manages timing alignment for specific secondary cells. This allows independent timing optimization for different cell groups, improving uplink timing alignment reliability in multicarrier scenarios while maintaining systematic configuration through clear separation of timing management responsibilities.
3Productivity
If secondary cell PUCCH transmissions are centralized on primary cells, then resource management is simplified, but network performance and efficiency decrease with more carriers
Solution Approach 1:
The patent segments PUCCH transmission responsibilities by creating multiple PUCCH groups that can be distributed across different cells. This allows PUCCH transmissions to be localized to appropriate cells rather than centralized on primary cells, improving network efficiency by reducing backhaul overhead and latency while maintaining operational simplicity through standardized group management procedures.
Solution Approach 2:
The patent introduces a new dimension of organization by grouping secondary cells into different PUCCH groups based on their timing advance group associations. This dimensional reorganization enables more flexible and efficient resource management, allowing the system to scale to more carriers without proportionally increasing management complexity.
Data Source
AI summary
Secondary cell management in wireless communications is described. A cell group may comprise a plurality of secondary cells. The cell group may comprise a first cell with a control channel. The wireless device may activate or deactivate the first cell. While the first cell is deactivated, each secondary cell of the cell group may be deactivated.