Terminal Device Uplink Timing Advance Adjustment for Neighboring Cell Interference
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Solution Overview
Problem
In communication systems like LTE and 5G, the uplink reference signals sent by terminal devices to neighboring cells cause interference due to improper timing alignment, affecting communication performance.
Innovation Solution
The terminal device calculates and adjusts its uplink timing advance (TA) based on the serving cell's TA and the downlink signal time difference with neighboring cells, ensuring accurate timing for sending uplink signals to neighboring cells, thereby reducing interference and improving communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal device sends uplink reference signals to neighboring cells based on the serving cell's TA, then the positioning measurement can be performed, but interference is caused to the neighboring cell
Solution Approach 1:
The patent applies local quality by using different timing advance values for different cells. The terminal device determines a first TA value for the serving cell and a second TA value for the neighboring cell, where the second TA value is specifically adjusted to align with the neighboring cell's uplink reception timing. This localized timing adjustment ensures that uplink signals are properly synchronized for each specific cell, eliminating interference while maintaining positioning measurement capability.
2Device complexity
If the terminal device uses the serving cell's TA for uplink transmission to neighboring cells, then the communication process is simplified, but the timing alignment with neighboring cells is inaccurate
Solution Approach 1:
The patent applies preliminary action by pre-determining the second TA value for the neighboring cell before actual uplink transmission. The terminal device calculates the second TA value based on the first TA value and the downlink signal time difference, and stores this timing adjustment information in advance. When transmitting uplink signals to the neighboring cell, the terminal device directly applies the pre-calculated second TA value, ensuring accurate timing alignment without adding complexity to the transmission process.
3Loss of energy
If the terminal device sends uplink signals without adjusting TA for neighboring cells, then the signaling overhead is reduced, but communication performance with neighboring cells deteriorates
Solution Approach 1:
The patent applies self-service by enabling the terminal device to autonomously determine and adjust its own timing advance values for different cells. The terminal device independently calculates the second TA value for the neighboring cell based on the first TA value and downlink signal time difference, without requiring additional network signaling or configuration. This self-adjustment mechanism ensures accurate timing alignment and reliable communication performance while minimizing signaling overhead.
Data Source
AI summary
This application provides a communication method and a communication device. The method includes: A terminal device obtains an uplink timing advance TA of a serving cell. The terminal device obtains a downlink signal time difference between the serving cell and a neighboring cell. The terminal device obtains an uplink TA of the neighboring cell based on the uplink TA of the serving cell and the downlink signal time difference. The terminal device sends an uplink signal to the neighboring cell based on a downlink subframe timing and the uplink TA of the neighboring cell. The uplink TA of the neighboring cell is obtained, so that the terminal device can send the uplink signal to the neighboring cell based on the uplink TA of the neighboring cell.