Base Station Secondary PUCCH Group Configuration for Cell Offloading
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Solution Overview
Problem
Existing LTE technologies face challenges in efficiently managing the increasing number of physical uplink control channels (PUCCH) due to high load on the primary cell, which limits the capacity and efficiency of wireless communication systems.
Innovation Solution
The implementation of multiple PUCCH groups, where PUCCH transmissions are distributed across both the primary and secondary cells, offloading the load from the primary cell and enhancing the overall communication capacity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If PUCCH transmissions are concentrated on the primary cell, then control signaling is simplified and managed centrally, but the primary cell becomes overloaded and communication capacity is limited
Solution Approach 1:
The patent divides the single PUCCH group into multiple PUCCH groups, with each group associated with a different cell (primary or secondary). This segmentation distributes the control signaling load across multiple cells, preventing primary cell overload while maintaining organized management of control channels through defined group associations.
2Productivity
If multiple PUCCH groups are implemented to distribute load, then communication capacity increases and primary cell load is reduced, but system complexity increases
Solution Approach 1:
The system segments PUCCH resources into multiple groups that can be independently managed and configured. Each PUCCH group is associated with specific cells, allowing flexible distribution of control signaling while maintaining clear organizational structure through the group-cell association model.
Solution Approach 2:
The patent enables cells to serve multiple functions: a cell can be part of a PUCCH group for control signaling while also providing data transmission services. The same cell infrastructure is utilized for both control and data planes, reducing the need for dedicated resources and minimizing additional system complexity.
3Reliability
If PUCCH load is distributed across multiple cells, then primary cell capacity is preserved and system robustness improves, but control signaling management becomes more complex
Solution Approach 1:
By segmenting PUCCH groups and associating them with specific cells, the patent creates a structured framework that simplifies management despite distribution. Each PUCCH group has defined associations with cells, providing clear management boundaries and reducing the complexity of distributed control signaling through organized group-cell mappings.
Data Source
AI summary
A base station transmits, to a wireless device, configuration parameters of a secondary physical uplink control channel (PUCCH) group. The configuration parameters include a PUCCH secondary cell and a secondary cell. The base station transmits, during a first time interval, a command activating the secondary cell. The base station starts reception of channel state information, from the wireless device, for the secondary cell from a second time interval that is a positive number plus a pre-determined number of time intervals after the first time interval. In response to activation of the PUCCH secondary cell being completed in or after the pre-determined number of time intervals after the first time interval, the positive number is based on when the activation of the PUCCH secondary cell is completed by the wireless device.