Uplink Timing Adjustment for High-Speed Train mmWave Networks
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Solution Overview
Problem
In high-speed scenarios, such as high-speed train deployments using mmWave/Frequency Range 2 (FR2) networks, the conventional timing adjustment mechanisms for uplink transmission face challenges in accurately aligning timing due to significant differences in propagation delays between remote radio heads, leading to potential beam failure and radio link failure.
Innovation Solution
A method involving the use of a time shifting value to determine offset information and timing information for transmission, allowing terminal devices to adjust their timing alignment without additional signaling overhead, by reporting differences in propagation delays and indicating timing advances based on this value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional timing adjustment mechanisms are used for uplink transmission in high-speed scenarios, then the system can maintain basic communication functionality, but timing alignment accuracy deteriorates due to significant differences in propagation delays between remote radio heads, leading to beam failure and radio link failure
Solution Approach 1:
The patent applies preliminary action by having the terminal device report propagation delay differences to the network device before beam switching occurs. The network device then pre-calculates and configures appropriate timing advance values based on these reported differences, ensuring accurate timing alignment is established in advance before the actual beam switch takes place, thereby preventing timing alignment failures.
Solution Approach 2:
The patent implements feedback by establishing a mechanism where the terminal device measures and reports propagation delay differences to the network device. The network device uses this feedback information to adjust timing advance parameters dynamically, creating a closed-loop system that continuously monitors and corrects timing alignment issues during beam switching in high-speed scenarios.
2Adaptability or versatility
If beam switching is performed to maintain connection in high-speed scenarios, then the terminal device can stay connected to the network, but timing adjustment for uplink transmission becomes inaccurate due to changing propagation delays
Solution Approach 1:
The patent applies dynamics by making the timing advance parameters adaptive and variable rather than fixed. The system dynamically adjusts timing advance values based on real-time propagation delay measurements and beam switching events. The terminal device continuously monitors propagation delays and provides feedback, allowing the network device to update timing parameters dynamically to match changing beam configurations and maintain accurate timing alignment throughout the beam switching process.
3Reliability
If timing advance is adjusted for each beam switch, then timing alignment can be maintained, but signaling overhead increases due to additional timing information exchange between terminal and network devices
Solution Approach 1:
The patent applies merging by combining the propagation delay difference reporting with existing beam switching indication signals. Instead of treating timing adjustment as a separate signaling process, the patent integrates timing advance information into the beam switching procedure, where the terminal device reports propagation delay differences as part of the beam switch activation process. This merging approach maintains timing alignment while avoiding redundant signaling overhead.
Data Source
AI summary
Example embodiments of the present disclosure relate to timing adjustment for uplink transmission, particularly in a high-speed scenario. A first device receives, from a second device, offset information indicating a difference in propagation delays between the first device and a third device experienced by the second device. The offset information is determined based on a time shifting value for a range of the difference in propagation delays. The time shifting value is associated with a switch from a beam associated with the first device to a beam associated with the third device. The third device is different from the first device. The first device transmits, to the second device, timing information indicating an amount of timing advance for transmission from the second device to the third device. The timing information is determined based on the time shifting value. Through this solution. UL transmission will be timing aligned.