Timing Advance Reporting Window for Reliable TAR Triggering
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Solution Overview
Problem
In communication systems, the lack of clear definition of the moment at which a terminal device should report timing advance reporting (TAR) leads to potential failures in triggering the TAR process, causing uncertainty and inefficiencies.
Innovation Solution
A method for triggering TAR by a terminal device that involves determining whether TAR has been reported from a specific moment to a current moment and initiating TAR if no report is made, with the specific moment clearly defined, such as during uplink transmissions carrying specific RRC messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device triggers TAR without clearly defining the specific moment for reporting, then the TAR process may fail to trigger properly, but defining a specific moment increases system complexity and requires additional signaling
Solution Approach 1:
The patent applies preliminary action by pre-defining the specific moment for TAR reporting in the protocol specification. The terminal device is configured with a predetermined time window (e.g., within a specific number of slots after a triggering event) during which TAR must be reported. This eliminates the need for complex real-time negotiations about reporting timing, as both the network and terminal device know in advance when reporting should occur, thereby ensuring reliable TAR triggering without increasing system complexity
Solution Approach 2:
The patent utilizes parameter changes by introducing a configurable time window parameter (e.g., k slots) that defines when TAR reporting should occur. This parameter can be adjusted based on different scenarios and network conditions, allowing the system to balance between timely reporting and processing overhead. By changing this temporal parameter, the system achieves reliable TAR triggering while maintaining flexibility and avoiding excessive complexity
2Productivity
If the terminal device waits for clear definition of reporting moment, then TAR triggering becomes uncertain, but immediate triggering without clear definition causes timing errors
Solution Approach 1:
The patent resolves this contradiction by establishing preliminary timing rules that define exactly when TAR reporting should occur. The terminal device is configured with a specific time window (e.g., within k slots after a triggering event such as handover or beam failure recovery). This preliminary definition allows the device to immediately trigger TAR at the correct moment without waiting for additional clarification, thereby maintaining both high communication efficiency and precise timing
Solution Approach 2:
The patent applies dynamics by making the reporting time window adaptable to different scenarios. The parameter k (number of slots) can be configured differently based on the specific situation, such as different values for handover, beam failure recovery, or initial access. This dynamic configuration allows the system to optimize timing precision for each scenario while maintaining overall communication efficiency across diverse operating conditions
3Ease of operation
If TAR reporting time window is extended, then more opportunities for reporting exist, but the time for timely communication adjustments is delayed
Solution Approach 1:
The patent applies parameter changes by configuring an optimal time window size (k slots) that balances flexibility and timeliness. This parameter is carefully selected to be large enough to provide multiple reporting opportunities and accommodate device processing requirements, yet small enough to ensure timely communication adjustments. The parameter can be adjusted based on network conditions and service requirements, achieving the right balance between reporting flexibility and adjustment speed
Data Source
AI summary
A method for triggering timing advance reporting (TAR) is performed by a terminal device, and includes: in response to a high layer of the terminal device initially configuring or reconfiguring a TA threshold, determining whether the terminal device reports TAR from a specific moment to a current moment; and in response to determining that the terminal device does not report TAR from the specific moment to the current moment, triggering TAR.