Timing Advance Group Expiry Logic for Multi-TAG Alignment
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing timing alignment for multiple wireless devices in heterogeneous networks, leading to inefficiencies and potential communication disruptions.
Innovation Solution
Implementing multiple timing advance groups (TAGs) to manage timing alignment across different wireless devices, allowing for more precise synchronization and improved communication efficiency in diverse network environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single timing advance group is used to manage timing alignment for all wireless devices, then device complexity is reduced, but communication reliability deteriorates in heterogeneous networks with varying coverage areas and traffic loads
Solution Approach 1:
The patent divides the timing advance management into multiple independent groups (first TAG and second TAG), where each group manages timing alignment for specific wireless devices or traffic types separately. This segmentation allows differentiated timing management for devices with different coverage requirements and traffic characteristics, resolving the contradiction by maintaining low complexity through group-based management while improving reliability through specialized timing control for each group.
2Productivity
If multiple timing advance groups are implemented to improve timing alignment precision, then communication efficiency improves, but device complexity increases
Solution Approach 1:
The patent implements multiple timing advance groups that are independently managed but follow standardized procedures within each group. The first TAG handles timing alignment for devices in one coverage area while the second TAG handles devices in another coverage area, allowing parallel timing management operations that improve overall communication efficiency without requiring complex cross-group coordination.
Solution Approach 2:
The patent applies different timing advance parameters and management strategies to different timing advance groups based on their specific requirements. By changing the timing parameters independently for each group according to coverage area and traffic load characteristics, the system achieves optimized communication efficiency for each group while maintaining manageable overall complexity through parameter differentiation rather than structural complexity.
3Reliability
If timing alignment is optimized for devices in specific coverage areas, then communication reliability improves, but system adaptability deteriorates
Solution Approach 1:
The patent designs the multiple timing advance groups to serve universal timing management functions across different network conditions. Each TAG can be configured and activated based on network requirements, allowing the same timing advance group structure to adapt to various coverage scenarios, traffic loads, and device types. This multi-functionality enables the system to maintain high reliability for specific coverage areas while preserving overall network adaptability through flexible configuration.
Data Source
AI summary
A memory comprises instructions that, when executed by the one or more processors, cause a wireless device to receive one or more messages indicating a plurality of timing advance groups (TAGs). The plurality of TAGs comprises at least two primary timing advance groups (PTAGs) for a special cell (SpCell), the at least two PTAGs comprising a first TAG associated with a first time alignment timer (TAT) and a second TAG associated with a second TAT. The plurality of TAGs comprises a third TAG associated with a third TAT. Based on expiries of the TATs associated with each PTAG of the at least two PTAGs of the SpCell, the wireless device determines all TATs associated with the plurality of TAGs as expired and transmits a random-access preamble after all the TATs associated with the plurality of TAGs are expired.