Timing Advance Detection for IoT Data Transmission
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Solution Overview
Problem
In the context of Internet of Things (IoT) data transmission using New Radio (NR) systems, the conventional random access process in LTE technology results in significant signaling overhead and resource wastage due to outdated Timing Advance (TA) configurations, especially when user equipment (UE) changes position or environment, leading to expired TA values.
Innovation Solution
A method where user equipment detects expired TA values and sends a random access signal or target notification message to the base station, prompting it to reconfigure a new TA and release reserved resources, thereby avoiding unnecessary resource reservation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station continues to reserve grant-free resources for user equipment with expired TA, then the user equipment can maintain grant-free transmission capability, but network resources are wasted
Solution Approach 1:
The base station proactively sends a TA validity query message to the user equipment before the reserved resources are fully utilized. This preliminary action allows the base station to verify TA validity in advance and release resources timely if the TA has expired, avoiding unnecessary resource waste while maintaining transmission capability when needed
Solution Approach 2:
The system implements a feedback mechanism where the user equipment responds to TA validity queries by sending either a TA update request (if TA is expired) or a confirmation message (if TA is still valid). This feedback loop enables the base station to make informed decisions about resource allocation and release, balancing reliability and resource efficiency
2Measurement precision
If the user equipment initiates random access process to update TA, then the TA accuracy is improved, but signaling overhead increases
Solution Approach 1:
The base station autonomously manages TA validity verification by initiating queries and processing responses. The user equipment only participates when necessary by responding to queries with either TA update requests or confirmation messages. This self-service approach minimizes unnecessary signaling interactions while ensuring TA accuracy is maintained when needed
Solution Approach 2:
The system changes the state of TA management from continuous random access to on-demand verification. By transitioning from frequent TA updates to targeted validity checks triggered by specific conditions (resource reservation, query messages), the signaling overhead is significantly reduced while TA accuracy is preserved through selective updates
3Productivity
If the user equipment sends data using grant-free procedure, then the transmission efficiency is improved, but TA expiration causes data transmission errors
Solution Approach 1:
Before grant-free data transmission occurs, the base station performs preliminary TA validity verification through query messages. This advance check ensures that only user equipment with valid TA values transmit data, preventing transmission errors while maintaining the high efficiency of grant-free procedures
Solution Approach 2:
The TA validity query and response mechanism creates a feedback loop that confirms transmission readiness. The user equipment's response to TA queries provides real-time information about TA status, enabling the base station to authorize or deny grant-free transmission accordingly, thus ensuring data transmission accuracy without sacrificing efficiency
Data Source
AI summary
A method and apparatus for data transmission are provided. The method is applied to a user equipment that detects a current timing advance (TA) in a target time unit to obtain a detection result. The user equipment sends, if the detection result indicates that the current TA has expired, at least one of a random access signal and a target notification message to a base station.