Timing Advance Group Segmentation for RRH Switching Latency
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Solution Overview
Problem
Current wireless communication systems face increased latency and overhead when a user equipment (UE) switches between remote radio headers (RRHs) within the same serving cell due to a single timing advance group (TAG) and TA offset, which is not adaptable to different propagation delays across RRHs.
Innovation Solution
Implementing a method for a UE to identify and switch to a different RRH with a specific timing advance group (TAG) and associated TA offset, allowing for efficient uplink communication by using the latest TA offset for uplink transmission, thereby reducing the need for continuous TA measurements and updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a single timing advance group (TAG) and TA offset is used for all RRHs in a serving cell, then device complexity is reduced, but latency increases when switching between RRHs due to the need for continuous TA measurements and updates
Solution Approach 1:
The patent segments the single TAG into multiple TAGs, with each TAG associated with a specific RRH or subset of RRHs. This segmentation allows the UE to maintain separate TA offsets for different RRHs, eliminating the need for continuous TA measurements when switching between RRHs within the same TAG, thereby reducing latency while managing complexity through structured organization
Solution Approach 2:
The patent applies local quality by assigning different TAG configurations to different RRHs based on their specific propagation characteristics. Each RRH can have its own optimized TAG and TA offset, allowing local adaptation to propagation conditions while maintaining overall system coordination through the TAG framework
2Reliability
If a single TAG is used for all RRHs, then overhead is reduced, but reliability decreases when switching between RRHs with different propagation delays
Solution Approach 1:
By segmenting the TAG structure to allow multiple TAGs per serving cell, each TAG can be optimized for specific RRHs with similar propagation characteristics. This segmentation improves uplink transmission reliability when switching between RRHs by maintaining appropriate TA offsets, while the structured segmentation approach manages configuration complexity
Solution Approach 2:
The patent changes the TAG configuration parameters dynamically, allowing the network to configure different TAGs with specific TA offsets based on propagation conditions. This parameter flexibility enables reliable uplink transmission across different RRHs while the network controls the complexity of parameter management
3Productivity
If continuous TA measurements and updates are performed when switching RRHs, then uplink synchronization is maintained, but latency and overhead increase
Solution Approach 1:
The patent implements preliminary action by pre-configuring multiple TAGs with their respective TA offsets before RRH switching occurs. When the UE needs to switch RRHs, it can immediately use the pre-configured TAG and TA offset for the target RRH, eliminating the need for continuous TA measurements and updates, thereby improving switching efficiency and reducing latency
Solution Approach 2:
The patent uses copying by reusing TAG configurations and TA offsets across multiple RRHs that share similar propagation characteristics. Instead of performing separate TA measurements for each RRH switch, the UE can copy the TAG configuration from one RRH to another, significantly reducing measurement overhead and improving productivity
Data Source
AI summary
Aspects described herein relate to identifying a timing advance group (TAG) for a second remote radio header (RRH) that is different from a first RRH, the TAG associated with a timing advance (TA) offset, wherein the first RRH and the second RRH are associated with a serving cell, switching from the first RRH to the second RRH in accordance with the TAG and the associated TA offset, and transmitting, on an uplink communication channel, data to the second RRH.