5G NR Carrier Aggregation Offloading for PCell Congestion
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Solution Overview
Problem
Existing carrier aggregation systems face challenges in efficiently managing traffic between PCells and SCells, particularly in scenarios where PCell congestion exceeds thresholds, leading to suboptimal user experience and spectral efficiency.
Innovation Solution
A system and method for offloading traffic from congested PCells to SCells based on congestion thresholds and user equipment location, utilizing different multiple access schemes, such as FDMA and TDMA, to balance load and improve throughput and spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If PCell is used to provide coverage and capacity, then user coverage is improved, but network congestion increases when user quantity exceeds threshold
Solution Approach 1:
The patent segments the network into PCell and multiple SCells, where PCell handles coverage and SCells handle capacity. This segmentation allows traffic to be distributed across multiple cells, preventing PCell congestion while maintaining coverage area.
Solution Approach 2:
The patent introduces a new dimension of traffic management by utilizing SCells that provide downlink coverage extension beyond PCell uplink coverage. This dimensional expansion allows users in coverage extension areas to offload downlink traffic to SCells, improving overall network throughput.
2Quantity of substance
If multiple SCells are added to increase bandwidth, then downlink capacity is improved, but system complexity increases
Solution Approach 1:
SCells are designed with multi-functionality, serving both as capacity extensions and downlink coverage extensions. This universal design allows SCells to handle multiple functions (downlink traffic, coverage extension) without requiring additional separate infrastructure, thereby managing system complexity.
Solution Approach 2:
The system dynamically manages SCell activation and traffic offloading based on PCell congestion conditions and user equipment locations. This dynamic approach allows the system to scale bandwidth capacity on-demand rather than maintaining fixed high complexity infrastructure.
3Productivity
If traffic is offloaded from PCell to SCell, then spectral efficiency is improved, but traffic management complexity increases
Solution Approach 1:
The system implements feedback mechanisms to monitor PCell congestion levels and user equipment locations in downlink coverage extension areas. Based on this feedback, the network controller dynamically decides which SCells to activate for traffic offloading, optimizing spectral efficiency while managing complexity through condition-based triggers.
Solution Approach 2:
User equipment in downlink coverage extension areas self-identify their location and capability to receive SCell downlink signals. This self-service approach reduces the burden on the network controller, as UEs provide information about their suitability for SCell offloading without requiring complex centralized analysis.
Data Source
AI summary
Methods are provided for determining that a traffic condition at a Primary Cell (PCell) used in New Radio Carrier Aggregation (NR CA) exceeds a congestion threshold. The method further includes determining that a user equipment (UE) attached to the PCell is disposed in a downlink coverage area of at least one Secondary Cell (SCell) used in the NR CA and based on the traffic condition at the PCell exceeding the congestion threshold and the UE being disposed in the downlink coverage area of the at least one SCell, reassigning at least a portion of downlink traffic between the PCell and the UE to a first SCell of the at least one SCell.