Secondary Cell Group Timing Advance Reuse for Uplink Reliability
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining reliable uplink timing synchronization during secondary cell group (SCG) activation and deactivation, leading to inefficiencies and potential communication disruptions.
Innovation Solution
A wireless device determines whether to reuse timing advance (TA) parameters based on signal quality measurements, with network configuration and indications for SCG activation/deactivation, allowing for efficient management of TA parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the wireless device always reuses TA parameters after SCG deactivation, then the activation speed is improved, but the timing synchronization reliability deteriorates when signal quality changes
Solution Approach 1:
The patent implements dynamic TA parameter reuse decision-making. The wireless device determines whether to reuse TA parameters based on current signal quality measurements compared to stored reference values. This dynamic approach allows the system to adapt between fast activation (when signal quality is good) and reliable resynchronization (when signal quality deteriorates), resolving the contradiction between speed and reliability.
Solution Approach 2:
The patent employs feedback mechanisms where the wireless device continuously monitors signal quality measurements and compares them against stored reference values. Based on this feedback, the device makes informed decisions about TA parameter reuse. The network also provides feedback through configuration information that guides the device's behavior, creating a closed-loop system that balances activation speed with synchronization reliability.
2Reliability
If the wireless device performs signal quality measurements after SCG deactivation, then the timing synchronization reliability is improved, but the activation time increases
Solution Approach 1:
The patent applies preliminary action by having the wireless device store reference signal quality measurements before SCG deactivation occurs. This pre-stored reference information is then available for immediate comparison when the device needs to decide whether to reuse TA parameters after deactivation. This eliminates the need for extensive real-time measurements during activation, reducing activation time while maintaining reliability through informed decision-making.
3Ease of operation
If the network provides configuration information for TA parameter reuse, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The patent implements self-service by enabling the wireless device to autonomously determine whether to reuse TA parameters based on its own signal quality measurements and stored reference values. The device independently makes the decision without requiring complex network control or manual configuration. The network provides high-level configuration information, but the actual TA parameter management is handled by the device's own measurement and comparison capabilities, distributing complexity appropriately.
Data Source
AI summary
Aspects are presented herein of apparatuses, systems, and methods for secondary cell group (SCG) addition. A wireless device may establish communication with a first base station that is comprised in a master cell group (MCG) and a second base station that is comprised in the SCG. The wireless device may maintain timing advance (TA) parameters for performing uplink communication with the second base station. The wireless device may perform a plurality of signal quality measurements after receiving an indication to deactivate the SCG. The wireless device may determine whether to reuse the TA parameters for communicating with the second base station after receiving an indication. The determination may be based on comparing one or more signal quality measurements of the second base station to one or more signal quality thresholds.