PUCCH Cell Switching for Multi-Cell HARQ Load Distribution
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Solution Overview
Problem
Existing technologies face challenges in efficiently managing PUCCH (Physical Uplink Control Channel) load distribution across multiple cells in a PUCCH group, leading to high load on the primary cell and potential resource bottlenecks.
Innovation Solution
Implementing a mechanism to allow PUCCH transmission on both the primary and secondary cells within a PUCCH group, enabling dynamic load balancing and offloading resources from the primary cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PUCCH transmission is performed only on the primary cell, then the control channel load is concentrated on a single cell, but this leads to high load on the primary cell and potential resource bottlenecks
Solution Approach 1:
The patent segments the PUCCH transmission function across multiple cells by configuring secondary cells to transmit PUCCH in addition to the primary cell. This divides the control channel load into multiple independent transmission points, preventing concentration of load on a single cell while maintaining reliable communication.
Solution Approach 2:
The patent introduces a spatial dimension to PUCCH transmission by enabling multiple cells (both primary and secondary) to transmit control channels simultaneously. This dimensional expansion from single-cell to multi-cell transmission distributes the load across different spatial resources, improving overall system capacity.
2Productivity
If PUCCH transmission is performed on multiple cells, then the control channel load is distributed, but this increases device complexity in managing PUCCH across multiple cells
Solution Approach 1:
The patent makes both primary and secondary cells capable of performing PUCCH transmission, creating a multi-functional system where any configured cell can handle control channel tasks. This universality allows flexible load distribution while using standardized transmission mechanisms, reducing the need for complex cell-specific handling.
Solution Approach 2:
The patent employs feedback mechanisms where the network dynamically configures which cells transmit PUCCH based on load conditions and resource availability. This feedback-driven configuration allows the system to automatically balance loads without requiring complex manual management, reducing operational complexity.
3Productivity
If dynamic load balancing is implemented across PUCCH cells, then resource utilization is optimized, but this requires complex coordination between multiple cells
Solution Approach 1:
The patent implements dynamic configuration where the network can flexibly assign which cells transmit PUCCH based on real-time conditions such as traffic load and resource availability. This dynamic adaptability allows optimal resource utilization while using standardized coordination protocols to manage complexity.
Solution Approach 2:
The patent merges the PUCCH transmission capability into both primary and secondary cells, creating a unified multi-cell transmission system. This merging approach consolidates the management function at the network level while distributing the actual transmission tasks, simplifying coordination through standardized interfaces.
Data Source
AI summary
A wireless device may transmit, to a base station, a capability message indicating a physical uplink control channel (PUCCH) cell switching capability is supported by the wireless device. The wireless device may receive, based on the PUCCH cell switching capability being supported, one or more messages comprising configuration parameters of: a first PUCCH cell of a PUCCH group; and a second PUCCH cell of the PUCCH group. The wireless device may receive downlink control information (DCI) indicating a downlink transmission of a transport block. The wireless device may select, based on a field of the DCI, a PUCCH cell from the first PUCCH cell and the second PUCCH cell of the PUCCH group. The wireless device may transmit, via the selected PUCCH cell, a hybrid automatic repeat request (HARQ) feedback for the transport block.