Secondary PUCCH Group Configuration for Carrier Aggregation
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Solution Overview
Problem
Current wireless network technologies face challenges in efficiently managing carrier aggregation, particularly in multicarrier communication systems, where the load on primary cells increases due to the accumulation of physical uplink control channel (PUCCH) transmissions, leading to performance degradation.
Innovation Solution
The implementation of secondary PUCCH groups and flexible PUCCH configurations, where control signaling is distributed across both primary and secondary cells, allowing for the offloading of PUCCH resources from primary cells and improving overall network capacity and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is implemented to support more carriers, then network capacity is improved, but the load on primary cells increases due to accumulation of PUCCH transmissions
Solution Approach 1:
The patent divides the PUCCH transmission resources into multiple groups (first PUCCH group and second PUCCH group), each associated with different serving cells. This segmentation allows PUCCH transmissions to be distributed across multiple cells rather than accumulated on a single primary cell, thereby maintaining network capacity while reducing the load on any individual primary cell.
2Ease of operation
If PUCCH resources are concentrated on primary cells for simplified control, then device complexity is reduced, but performance degrades due to excessive load on primary cells
Solution Approach 1:
The patent segments PUCCH group associations with different serving cells (PCell and SCell), distributing control signaling across multiple cells. This maintains operational simplicity through clear group associations while improving reliability by preventing any single cell from becoming a performance bottleneck due to excessive PUCCH load.
3Quantity of substance
If multiple PUCCH groups are configured to distribute control signaling, then PUCCH load on primary cells is reduced, but device complexity increases
Solution Approach 1:
The patent introduces a segmented PUCCH group configuration where different PUCCH groups are associated with different serving cells. While this segmentation reduces PUCCH load on primary cells, it does increase device complexity through multiple group associations. The patent balances this by establishing clear rules for determining which PUCCH group to use based on the serving cell, providing structured management that mitigates the complexity increase.
4Productivity
If PUCCH transmissions are offloaded from primary cells to secondary cells, then network capacity is enhanced, but configuration complexity increases
Solution Approach 1:
The patent segments PUCCH transmissions across multiple serving cells by defining different PUCCH groups associated with different cells. This enables offloading of PUCCH transmissions from primary cells to secondary cells, thereby enhancing network capacity. The configuration complexity is managed through systematic association rules that link specific PUCCH groups to specific serving cells, providing a structured approach to the multi-cell configuration.
Data Source
AI summary
A wireless device transmits a power headroom report media access control control element (PHR MAC CE). The PHR MAC CE comprises a presence field comprising a plurality of presence bits. The presence field is of a fixed size of one octet when up to seven of the one or more secondary cells are each configured with a cell index having a value between one and seven. The presence field is of a fixed size of four octets when the one or more secondary cells comprise more than seven secondary cells with configured uplinks.