Multicarrier Cell Grouping for Low-Delay Timing Advance Handover
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing multiple timing advance groups, particularly during handovers, leading to increased handover overhead and delays due to the lack of effective signaling and configuration mechanisms for timing advance groups in LTE release 10.
Innovation Solution
Implementing a system that allows for the configuration and management of multiple timing advance groups (TAGs) using RRC signaling, enabling efficient handover processes by maintaining or updating TAG configurations during handovers, reducing overhead and delay through optimized signaling and UE capability-based configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple timing advance groups are managed in LTE release 10, then timing alignment capability is improved, but handover overhead and delays increase due to lack of effective signaling mechanisms
Solution Approach 1:
The patent segments the timing advance management by introducing separate timing advance groups (TAGs) with distinct group IDs. Each TAG can be independently configured and managed, allowing the system to handle multiple timing advance scenarios without requiring complete reconfiguration during handover. This segmentation enables efficient resource allocation and reduces handover overhead by maintaining separate timing advance states for different cell groups.
Solution Approach 2:
The patent implements preliminary configuration of timing advance groups before handover occurs. The source base station pre-configures TAG structures and timing advance parameters, so that when handover happens, the UE can quickly switch to the target TAG configuration without extensive real-time negotiation. This preliminary setup reduces handover delay by having timing advance information ready in advance.
2Measurement precision
If timing advance group configurations are updated during handover, then timing alignment accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts the timing advance group configuration into a separate, reusable structure that can be independently managed. By separating TAG configuration from the main handover signaling, the system can efficiently transfer only the necessary TAG identifiers and parameters during handover, rather than transmitting complete timing advance configurations. This extraction reduces signaling overhead while maintaining timing alignment accuracy.
Solution Approach 2:
The timing advance group configuration structure is designed to be universal and multi-functional, serving both as a timing alignment mechanism and as a handover management tool. The same TAG structure is used for configuring multiple cells with different timing advances, and it can be seamlessly transitioned during handover by simply updating the group ID associations. This universality eliminates the need for separate signaling mechanisms, reducing overall signaling overhead.
Data Source
AI summary
Methods, systems, and apparatuses are described for wireless communications. Cells may be grouped into a plurality of cell groups. A base station may transmit a control message to modify a cell group of a cell associated with a wireless device.