Wireless Handover Signaling with Multiple Timing Advance Groups
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Solution Overview
Problem
Current multicarrier communication systems face challenges in efficiently managing multiple timing advance groups, particularly during handovers, where existing LTE technologies do not support multiple timing advance group configurations, leading to increased handover overhead and delay.
Innovation Solution
The implementation of multiple timing advance groups (TAGs) in wireless communication systems, where serving cells with the same uplink timing alignment are grouped together, allowing for dynamic configuration and reconfiguration of TAGs using RRC signaling, enabling efficient handover processes by maintaining or updating TAG configurations during handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing LTE technology is used for handover, then the system is simple to implement, but handover overhead and delay increase
Solution Approach 1:
The patent divides the timing advance management into multiple independent TAGs (Timing Advance Groups), where each TAG can be independently configured and managed. This segmentation allows parallel processing of timing adjustments for different cell groups, reducing handover overhead and delay while maintaining system manageability through structured organization of timing resources.
2Productivity
If multiple timing advance groups are supported, then handover efficiency improves, but device complexity increases
Solution Approach 1:
The patent implements dynamic TAG configuration where the network can add, modify, or release TAGs based on real-time handover requirements. The RRC connection reconfiguration messages enable flexible creation and modification of TAG structures during operation, allowing the system to adapt to changing network conditions without requiring complete reconfiguration, thus improving handover efficiency while managing complexity through dynamic rather than static structures.
Data Source
AI summary
A serving base station receives a first message comprising at least one parameter indicating whether a wireless device supports configuration of timing advance groups (TAGs). The serving base station transmits a second message causing assignment of each of at least one secondary cell to a TAG in a first plurality of TAGs. The serving base station transmits a third message to a target base station. The third message comprises at least one of: the at least one parameter indicating whether the wireless device supports configuration of the plurality of TAGs; and configuration information of the first plurality of TAGs.