Terminal Device Timing Advance Validity Determination
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Solution Overview
Problem
In communication systems, particularly in NB-IoT, the timing advance (TA) for uplink transmissions in preconfigured resources is not accurate, leading to interference between users due to varying arrival times of uplink data at the eNB, as current methods rely on estimated TA and TA timers that can result in false alarms and miss detections.
Innovation Solution
A communication method where a terminal device determines the validity of the TA based on location-related information, such as RSRP measurements, and adjusts the TA timer to avoid false alarms and miss detections by comparing measured RSRP with reference values and adjusting the timer accordingly, ensuring accurate TA validity determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the TA timer is used to determine TA validity, then the determination process is simple, but false alarms occur when the terminal device moves excessively long distances without timer expiration
Solution Approach 1:
The patent introduces RSRP measurement feedback to the TA validity determination process. The terminal device measures RSRP of the serving cell and compares it with a stored reference RSRP value. When the RSRP change exceeds a threshold, the terminal device determines that the TA is invalid even if the TA timer has not expired, thereby preventing false alarms while maintaining operational simplicity
Solution Approach 2:
The patent changes the determination parameter from solely time-based (TA timer) to a combination of time-based and signal-quality-based (RSRP measurement). By introducing RSRP as an additional parameter, the system can detect terminal movement and invalidate TA appropriately, resolving the contradiction between simple operation and reliable accuracy
2Measurement precision
If the TA timer expires to determine TA invalidity, then the determination criterion is clear, but miss detections occur when the terminal device moves very short distances
Solution Approach 1:
The patent uses RSRP measurement feedback to complement the TA timer expiration criterion. By continuously monitoring RSRP changes and comparing with reference values, the system can detect even small movements that cause TA invalidity, preventing miss detections while maintaining clear determination criteria
Solution Approach 2:
The patent performs preliminary RSRP measurements and stores reference RSRP values before TA validity determination. This preliminary action establishes a baseline for comparison, enabling the system to detect small movements accurately without waiting for TA timer expiration, thus preventing miss detections
Data Source
AI summary
A communication method and device, the method including obtaining, by a terminal device, a timing advance (TA), determining, by the terminal device according to a preset rule and first information, whether the TA is valid, where the first information includes a first parameter, and wherein the first parameter is information related to a location of the terminal device, and performing at least one of determining, by the terminal device, in response to the TA being invalid, that uplink data transmission cannot be performed, or determining, by the terminal device, in response to the TA being valid, that the TA can be used for uplink data transmission.