Carrier Aggregation Scheduling in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently scheduling a primary cell from a scheduling secondary cell, particularly in multi-cell and multi-RAT environments, leading to suboptimal resource allocation and performance.
Innovation Solution
The proposed solution involves enhanced processes for carrier aggregation in wireless devices and base stations, specifically focusing on improved scheduling mechanisms between primary and secondary cells, leveraging advanced protocol layers and radio access technologies like 5G NR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is implemented with multiple secondary cells, then data rate and network capacity are improved, but scheduling complexity and resource allocation difficulty increase
Solution Approach 1:
The patent segments the scheduling problem by introducing separate scheduling entities for different cell types. The primary cell has a scheduling entity that schedules both primary and secondary cells, while secondary cells have their own scheduling entities that only schedule other secondary cells. This segmentation reduces the complexity of coordinating multiple cells by dividing the scheduling function into manageable parts.
Solution Approach 2:
The patent introduces a scheduling entity as an intermediary component between the primary cell and secondary cells. This scheduling entity acts as a mediator that receives buffer status reports from secondary cells and generates appropriate scheduling decisions, simplifying the interaction between multiple cells and reducing direct coordination complexity.
2Productivity
If cross-carrier scheduling is used to manage multiple cells, then resource allocation efficiency is improved, but message transmission overhead and processing delay increase
Solution Approach 1:
The patent applies preliminary action by having secondary cell scheduling entities prepare and transmit buffer status reports in advance before actual data transmission is needed. This allows the primary cell scheduling entity to have forward knowledge of buffer states and make scheduling decisions proactively, reducing processing delay when actual scheduling occurs.
Solution Approach 2:
The patent implements feedback mechanisms where secondary cells continuously report their buffer status to the primary cell scheduling entity. This feedback loop enables dynamic adjustment of scheduling decisions based on real-time conditions, improving resource allocation efficiency while maintaining manageable processing delays through structured information exchange.
3Adaptability or versatility
If traditional scheduling methods are used in multi-RAT environments, then implementation simplicity is maintained, but adaptability and performance optimization are limited
Solution Approach 1:
The patent applies universality by designing a scheduling mechanism that can handle multiple radio access technologies (RATs) through a unified approach. The scheduling entities operate similarly across different cell types and RATs, with the primary cell scheduling entity capable of managing both primary and secondary cells regardless of the underlying technology. This multi-functional design improves adaptability while controlling complexity through standardization.
Data Source
AI summary
Certain aspects of the present disclosure relate to scheduling in carrier aggregation for wireless communication systems, more particularly when a primary cell and one or more secondary cells are configured for a wireless device. The processes used in the wireless device and/or network are enhanced to enable scheduling of a primary cell from a secondary cell.