Time Alignment Timer Control for Wireless Mobility Timing Advance
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately aligning time advance measurements for mobility management, leading to inefficiencies and potential connectivity issues in mobile devices.
Innovation Solution
Implementing a mechanism to control the time alignment timer in wireless devices, ensuring precise synchronization and mobility management through adaptive timing adjustments based on network conditions and device capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the time alignment timer is not controlled adaptively, then the wireless device can maintain simple timing operations, but time alignment precision deteriorates leading to connectivity issues
Solution Approach 1:
The patent applies dynamics by making the time alignment timer adaptive rather than fixed. The timer value is dynamically adjusted based on network conditions, device capabilities, and mobility state. This allows the system to optimize time alignment precision for each specific operational context while avoiding unnecessary complexity through condition-based adjustment rather than continuous control.
Solution Approach 2:
The patent changes the timer parameter from a static configuration to a dynamic variable that can take different values based on multiple factors including network conditions, device capabilities, and mobility state. This parameter change enables precise time alignment adaptation without requiring complex real-time control mechanisms.
2Adaptability or versatility
If fixed timing parameters are used, then device complexity is reduced, but mobility performance and connectivity deteriorate in varying network environments
Solution Approach 1:
The system dynamically adjusts timing parameters based on detected network conditions and device state. The timer value changes in response to mobility events, network load conditions, and device capabilities, enabling adaptability without requiring complex learning algorithms or continuous optimization mechanisms.
Solution Approach 2:
The patent implements preliminary action by pre-configuring multiple timer values or timing parameters that can be selected based on anticipated network conditions. This allows the system to be prepared for different scenarios without requiring complex real-time computation, balancing adaptability with implementation simplicity.
3Reliability
If time alignment is not optimized, then latency increases and connectivity issues occur, but implementing control mechanisms adds system complexity
Solution Approach 1:
The system incorporates feedback mechanisms where the wireless device monitors network conditions and device state, then adjusts the time alignment timer accordingly. This feedback loop ensures reliable connectivity by adapting to changing conditions while keeping the control mechanism simple through direct observation and pre-defined adjustment rules rather than complex closed-loop control.
Data Source
AI summary
A wireless device receives one or more radio resource control (RRC) messages comprising configuration parameters of a layer-1 or layer-2 triggered mobility (LTM) candidate configuration for an LTM procedure. The configuration parameters comprise a configuration index of the LTM candidate configuration and a physical cell identifier (PCI) of a cell for the LTM procedure. The wireless device receives an LTM cell switch command medium access control (MAC) control element (CE) comprising the configuration index of the LTM candidate configuration and not comprising a timing advance command (TAC) with a timing adjustment value for a primary timing advance group (PTAG) of the cell. In response to the receiving the LTM cell switch command not comprising the TAC with the timing adjustment value for the PTAG and after the wireless device measures of a timing advance of the cell, the wireless device starts a time alignment timer associated with the PTAG.