User Equipment Timing Advance Reuse During Measurement Gaps
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Solution Overview
Problem
In wireless communication networks, particularly in LTE, user equipment (UE) experiences synchronization loss and connection drops due to missed timing advance (TA) commands during measurement gaps, leading to reduced user experience and unnecessary corrective actions.
Innovation Solution
A method and apparatus for detecting and compensating missed TA messages by disabling reception during measurement intervals, reusing the previous TA command value, and reserving receive chains to ensure timely message reception, thereby avoiding connection failures and maintaining synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE disables reception during measurement gaps to measure other networks, then measurement capability is improved, but timing advance commands may be missed causing synchronization loss
Solution Approach 1:
The UE stores the previous TA command value before entering measurement gap, preparing in advance for potential missed TA commands. This preliminary storage action enables the UE to recover synchronization by reusing the stored TA value when a TA command is missed during the measurement gap.
Solution Approach 2:
The UE monitors whether a TA command is received during the measurement gap and provides feedback about the reception status. Based on this feedback, the UE determines whether to use the stored previous TA command value, creating a closed-loop control mechanism that adapts to the actual reception condition.
2Reliability
If the UE expects periodic TA commands to maintain synchronization, then synchronization reliability is improved, but connection drops occur when TA commands are missed during measurement gaps
Solution Approach 1:
The UE prepares a backup TA command value (the previous TA command) before entering the measurement gap. This cushioning mechanism provides a safety net that prevents connection drops when the periodic TA command is missed during the measurement gap, as the UE can switch to the stored value.
Solution Approach 2:
The UE dynamically changes the TA command parameter based on reception status. When a TA command is missed during measurement gap, the UE reuses the previous TA command value, effectively changing the TA parameter from the expected new value to the stored historical value to maintain synchronization.
3Adaptability or versatility
If the UE performs measurements on other networks during measurement gaps, then network adaptability is improved, but timing alignment is lost due to missed TA commands
Solution Approach 1:
The UE stores the previous TA command value before entering measurement gap, preparing in advance for potential timing alignment issues. This preliminary storage enables the UE to quickly recover timing alignment by reusing the stored value when a TA command is missed during measurement.
Data Source
AI summary
Methods and apparatus for parameter (e.g., timing) adjustment in a wireless network. In one embodiment, the timing adjustment includes detection and compensation for one or more missed adjustment messages. In one variant, for certain designated events, a client device may ignore a timer expiration, and apply a previously stored timing advance (TA) command. For example, a user equipment (UE) will determine if a TA command has been missed during a measurement gap interval (such as e.g., to perform measurements on an unsynchronized network), and reuse the previous TA command value. Reusing the TA command value introduces negligible error, which can be corrected in existing error correction capabilities (e.g., OFDM cyclic prefixes, etc.).