Semi-Persistent Scheduling Confirmation for Secondary Cell Activation
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Solution Overview
Problem
Existing multicarrier communication systems face challenges in efficiently managing carrier aggregation and dual connectivity, particularly in handling timing alignment and resource allocation for secondary cells, leading to increased PUCCH load on primary cells and suboptimal resource utilization.
Innovation Solution
Implementing semi-persistent scheduling mechanisms for secondary cells, including activation and deactivation control elements, and timing advance group management to optimize resource allocation and reduce PUCCH load on primary cells, while supporting dual connectivity and carrier aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semi-persistent scheduling is implemented for secondary cells, then resource utilization efficiency is improved, but system complexity increases
Solution Approach 1:
The patent segments the scheduling mechanism into distinct components: semi-persistent scheduling for secondary cells, separate activation/deactivation control elements, and dedicated timing advance group management. This segmentation allows each component to handle specific aspects of resource allocation independently, improving overall efficiency while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent implements preliminary actions by pre-configuring semi-persistent scheduling parameters and timing advance groups before actual data transmission begins. Activation and deactivation control elements are prepared in advance, allowing the system to quickly adjust resource allocation without complex real-time calculations, thus improving resource utilization while reducing operational complexity.
2Reliability
If timing advance group management is implemented, then timing alignment is improved, but control signaling overhead increases
Solution Approach 1:
The patent merges timing advance control functions into unified timing advance groups that can be managed collectively. By combining multiple timing alignment operations into single control signaling messages, the system achieves reliable timing alignment across multiple secondary cells while reducing the total overhead of individual control signals through consolidation.
3Productivity
If carrier aggregation is supported, then network capacity is improved, but PUCCH load on primary cells increases
Solution Approach 1:
The patent extracts PUCCH reporting functions from the primary cell by implementing semi-persistent scheduling on secondary cells with dedicated resource allocation. This extraction allows secondary cells to handle their own scheduling confirmations locally, reducing the PUCCH load on primary cells while maintaining the enhanced network capacity provided by carrier aggregation.
Data Source
AI summary
A wireless device may receive configuration information for a plurality of periodic resource allocations. A downlink control information (DCI) may be received comprising an indication of activation or release of at least one periodic resource allocation of the plurality of periodic resource allocations. After receiving the DCI, a medium access control (MAC) subheader comprising a logical channel identifier (LCID) that identifies a confirmation MAC control element may be sent. The confirmation MAC control element may comprise a plurality of fields, and at least one of the plurality of fields may indicate receipt of the indication of activation or release by using a same value to indicate either the activation or the release.